JPS5838325B2 - Vehicle air conditioning control method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to vehicle air conditioning control (in which an on-vehicle power source is selectively connected to a cooling mechanism to adjust the cooling capacity and reduce the operating rate of the cooling mechanism). Therefore, it is an attempt to realize power-saving air conditioning control.

Conventionally, in a cooling mechanism 6 for vehicle air conditioning control that includes a refrigerant compressor driven by an on-vehicle engine 6, the engine is automatically activated and stopped according to the need for cooling capacity in air conditioning control. There is a demand to reduce the load as much as possible.

In view of this demand, it is an object of the present invention to provide a vehicle air conditioning control method and device that easily and accurately determines the necessity of cooling capacity and appropriately controls the operation and stop of a cooling mechanism.

The first feature of the present invention is that the temperature control system stops the cooling mechanism when the outside temperature of the vehicle is sufficiently lower than the target temperature, on the condition that the temperature control system exits the transient state and approaches a stable state. When the air conditioner is in the cooling mode (rapid cooling), the cooling mechanism is kept in operation state 6, and the cooling mechanism is rubbed at G so as not to impair the cool-down effect.

The second feature of the present invention is that the temperature detector for inside and outside the vehicle and the setter for the target temperature used for controlling the interior temperature of the vehicle are also used.
It is an object of the present invention to provide a digital control device that can perform temperature control as well as cooler control.

Therefore, the control device according to the present invention has the features shown in the functional block diagram l of FIG. 17.

Note that in FIG. 17C, the symbols in parentheses are the same as those described in the description of the embodiment and the drawings to be described later.

First, the vehicle air conditioner to which the present invention is applied includes a ventilation duct 10 for sending air toward the vehicle interior, a blower motor 14 for generating airflow toward the vehicle interior VC in the ventilation duct, and a ventilation duct 134. It includes a heater 16 and a cooler 15 having a cooling mechanism 22 driven by an on-vehicle power source, and performs heat exchange with the air flow generated by the blower motor, and the amount of heat exchange can be adjusted. It has a heat exchange means TR.

The control device of the present invention uses, as control condition generating means, an inside temperature detection stage 60 that generates a first signal S1 corresponding to the actual temperature inside the vehicle interior, and a second signal S2 corresponding to the temperature outside the vehicle interior. It includes an outside temperature detecting means 61 that generates an external temperature, and a setting stage 63 that generates a third signal S3 corresponding to the target set temperature inside the vehicle. be done.

The digital control stage 1 includes the control condition generating means 60, 6.
The first, second and third signals S 1 - obtained at 1.63
8 3 for producing a first control output signal CS1 indicative of the amount of heat exchanged in said heat exchange means.

The first control output signal CS1 generated by this first means a is applied to the first electric drive means EM14 which adjusts the amount of heat exchange in the heat exchange means TR, thereby causing the air flow from the ventilation duct to the passenger compartment VCI. The temperature of the supplied air is adjusted and controlled so that the temperature of the vehicle compartment (C) is maintained close to the set target temperature.

The digital control stage 1 uses the first signal S1 obtained by the inside temperature detection means 60 and the third signal S3 obtained from the setting means 63, and compares them. a second signal S2 obtained by the outside temperature detection means 61, and a third signal S3 obtained by the setting stage 63; and a third means C for determining whether or not the temperature outside the vehicle interior is lower than a predetermined temperature difference with respect to the target temperature.

After all, the second means b has the role of determining whether the temperature control state is in a stable state or in a transient state in which the temperature inside the vehicle is rapidly decreasing, and the third means C has the role of determining whether the temperature control state is in a stable state or in a transient state where the temperature inside the vehicle is rapidly decreasing It has the role of determining whether the equipment has sufficient surplus capacity.

These determination results are further determined in the fourth means d.
The cooling mechanism 22 is comprehensively judged, and when both judgment results are positive, the cooling mechanism 22 is cut off from the on-vehicle power source, and when at least one judgment result is negative, the cooling mechanism 22 is connected to the on-vehicle power source. , a second control output signal CS2 is generated.

This second control output signal CS2 is applied to the second electric drive means EM2, and this drive EM determines whether the cooling mechanism 22 should be activated or stopped.

The present invention will be described below with reference to embodiments shown in the accompanying drawings.

This embodiment is a known cold air/warm air mixing type air conditioner, in other words, cooling air supplied to six upstream areas of a temperature adjustment member is distributed to a heater and its bypass passages by this temperature adjustment member, and the distribution is In an air conditioner that adjusts the temperature of downstream mixed air blown into a target space according to the ratio of From this, it is configured to control according to a preset processing order C.

In FIG. 1 showing the overall system, the upstream side 6 of the ventilation duct 10 is an air inlet 11 that communicates with the interior of the vehicle as an air inlet (intake port) to circulate the inside air (indoor air); There is an outside air inlet 12 for taking in outside air (outdoor atmosphere), and one of the two inlets is closed by a damper 13C.

The selection of the inlets 11 and 12 by the damper 13 is referred to as internal/external air switching.

On the downstream side of the ventilation duct 10c, there are a blower motor 14, a cooler 15 consisting of a refrigerant evaporator (evaporator) of a cooling cycle 22, a heater core 16 using engine cooling water as a heat source, and this heater 12. Six dampers 18 are arranged in order as temperature adjusting members for adjusting the ratio of the air passing through the bypass passage 17 to the air passing through the bypass passage 17.

The most downstream side C of the ventilation duct 10 is provided with two types of air outlets 19 and 20 for blowing out the temperature-controlled air inside the ventilation duct 10 toward the vehicle interior, and is indicated by the reference numeral 19. One outlet is an upper outlet for blowing cold air toward the upper part of the vehicle interior, and the second outlet is a lower outlet for blowing warm air toward the lower part of the vehicle interior.

The upper air outlet 19 and the lower air outlet 20 may each have a plurality of openings provided at appropriate locations within the vehicle interior and may be connected to each other by a duct.

One of the upper and lower air outlets 19 and 20 is closed by a damper 21.

The selection of the air outlets 19 and 20 by the damper 21 is referred to as air outlet switching.

Each element arranged in the ventilation duct 10 is a temperature control damper 1
In addition to the temperature control by 8, air conditioning is performed according to the driver's preferred driving mode.

The air conditioner described in this embodiment has operating modes such as an internal/external air switching operation, an operation in which the cooler 15 is artificially switched between operation and non-operation, and an economy mode in which the cooler 15 is automatically switched between operation and non-operation. (power-saving operation).

When switching between inside and outside air, you can select cooling operation when the outside air temperature is quite high, inside air circulation operation when the atmosphere is dirty, or outside air intake operation when the inside air is dirty.

Furthermore, switching between inside and outside air may be performed automatically in conjunction with other driving modes.

For example, when the cooler 15 is in the non-operating mode and the target indoor temperature cannot be obtained in the internal air circulation mode, the damper 13 automatically switches to outside air and enters the outside air intake mode.

The selection of whether to operate or deactivate the cooler 15 can be made when desiring cooling operation when the outside air temperature is high or when using the cooler 1 for dehumidification.
5 or when heating operation is desired when the outside temperature is sufficiently low.

In the economy operation, it is determined whether or not the operation of the cooler 15 is necessary to obtain the target indoor temperature, and the operation or non-operation of the cooler 15 is automatically controlled. It is used to reduce the time and prevent the wastage of drive energy.

The cooling cycle 22 including the cooler 15 is a compressor (refrigerant compressor) driven via a propeller shaft l trowel V belt etc. of an engine 23 as an automobile prime mover.
24, condenser 25, liquid receiver 26, and expansion valve 13
This is a well-known structure in which the condenser 25 emits the heat of the refrigerant and the cooler 15 absorbs the heat of the air introduced into the refrigerant, forming a heat cycle. .

The temperature of the air that has passed through the cooler 15 is approximately 0.degree. C., and the temperature of the introduced air and the rotational speed of the compressor 24 have little to do with it.

The operation and non-operation of the cooler 15 approximately correspond to the operation of the cooling cycle 22.

The cooling cycle 22 is driven by a compressor 24 which is its driving source.
The engine 23 is stopped and operated by disconnecting and disconnecting the mechanical connection mechanism between the engine 23 and the engine 23.

The superheater 16 is connected to a cooling water pipe connected to a cooling water bracket of the engine 23, and has a heat exchange function to release heat of the cooling water heated by the engine 166.

The temperature-sensitive flow control valve 28 adjusts the flow path of the cooling water depending on the temperature of the cooling water, either through the heater 16 or through a radiator (not shown), so that the heater 16 also maintains almost constant heat. You now have the ability to exchange.

In order to control the temperature and the operation mode, the cooling cycle 22 and the inside/outside air switching damper 13 in the ventilation duct 10, the temperature adjustment damper 18, and the outlet switching and damper 21 are electrically driven.

The electromagnetic clutch 50 connects and connects the mechanical connection between the compressor 24 and the engine 23, and connects the clutch to rotate the compressor 24 when energized via the power line 50a, and connects the clutch to rotate the compressor 24 when deenergized. The rotating state of the compressor 24, in which the clutch is disengaged and the compressor 24 is stopped, is called on, and the stopped state is called off.

The inside/outside air switching damper 13 includes a diaphragm actuator 51,
It is driven by a negative pressure actuator consisting of a three-way switching solenoid valve 52 that switches between atmospheric communication and engine negative pressure communication.

When the three-way switching solenoid valve 52 is energized via the power supply line 52a, negative pressure is supplied to the diaphragm actuator 51, and the damper 13 is moved from the outside air introducing state shown in the figure to the direction indicated by the dashed arrow l. When the electromagnetic valve 52 is deenergized, atmospheric pressure is supplied to the diaphragm actuator 51, and the damper 13 is pushed back to the illustrated position (outside air introduction state) by the force of a spring (not shown).

It is driven by a negative pressure actuator consisting of a temperature control damper 18G1 diaphragm actuator 53 and two solenoid valves 54 and 55 that control engine negative pressure communication and atmospheric communication, and the solenoid valve 54 is energized by the solenoid valve 54a. When the diaphragm actuator 53c is supplied with negative pressure, the connecting mechanism 53a
When the solenoid valve 55 is energized by the power supply line 55a, atmospheric pressure is supplied to the diaphragm actuator 53l, and the damper 18 is slowly pushed back by a spring I (not shown). .

When both solenoid valves 54,55 are deenergized, the diaphragm actuator 53 is stopped and the damper 18 is stopped and held in its current position.

Note that the opening degree of the damper 18 is 100% when the bypass passage 17 is fully closed (maximum heating position), and the opening degree of the damper 18 is 100%.
0% is when the upstream side is fully closed (minimum heating position).

The outlet switching damper 21 is driven by a negative pressure actuator consisting of a diaphragm actuator 56 and a three-way switching solenoid valve 57 that switches between atmospheric communication and engine negative pressure communication.
When the solenoid valve 57 is energized by the solenoid valve 7a, negative pressure is supplied to the diaphragm actuator 56, and the damper 21 is relatively quickly pulled six times from the illustrated position (lower blowout) via the coupling mechanism 56a, resulting in an upper blowout. When the valve 57 is deenergized, a diaphragm actuator 570 supplies atmospheric pressure and a spring 6 (not shown) pushes the damper 21 back to the six positions shown.

The control device 1 includes the electromagnetic clutch 5, which is an electrically driven member.
0, switches between energizing and deenergizing the solenoid valves 52, 54, 55, and 57, and commands temperature control and control of each operation mode.

Further, the control device 1 is connected to various information input means for temperature control and control of each operation mode, and processes input information based on a control program set internally in advance to control the electrical control members. Activate.

When the blower motor 14 is energized by the power supply line 14a6, it rotates to form a flow of air within the ventilation duct 10.

The blower motor 14 operates regardless of the target temperature and operating mode as long as the air conditioner is in operation.

The means for inputting various types of information to the control device 16 include an inside temperature sensor 60, which is installed in a small passage provided in the upstream part of the ventilation duct 10 so that inside air passes through, and generates a signal according to the inside air temperature; The front side of the radiator grille, etc. (this is installed so that it receives as little ventilation and radiant heat as possible from the engine, etc.), the outside temperature sensor 61 that generates a signal according to the outside temperature, and the opening (position) of the temperature control damper 18. There is an opening sensor 62 that generates a signal according to the opening angle, and an operation panel 2 installed near the control device 1.

The control device 1 is installed near the air conditioner, but six operation panels 2 may be installed, for example, on an instrument panel in front of the driver's seat.

The operation panel 2 includes a temperature setting device 63 that generates a signal according to the setting of the target internal air temperature, and a temperature setting device 63 that operates the air conditioner.
A main switch 64 for commanding non-operation, a switch 65 for selecting operation or non-operation of the cooler 15 (hereinafter referred to as an air conditioner switch) as a switch for selecting an operation mode, and a switch 65 for selecting operation or non-operation of the cooling cycle, a suction port or indoor air An inlet changeover switch 66 that selects between the inlet 11 and the outside air inlet 12, an economy switch 67 that selects economy operation, and a short-time inlet switch (hereinafter referred to as a short inlet switch) that makes the inlet the inlet 11 for a few minutes. )6
8 is provided.

Further, the operation panel 2 may be provided with display means for displaying the internal air temperature under control.

Power is supplied to the device from an on-vehicle battery 3 via an ignition key switch 4.

FIG. 2 is a wiring diagram showing mutual electrical connections between the control device 1, various information input means, and electrical control members.

Among the information input means, the inside temperature sensor 60, the outside temperature sensor 61, the damper opening sensor 62, and the temperature setting device 63 on the operation panel 2 input respective generated signals to the control device 1 in the form of analog voltage signals.

Therefore, heat-sensitive resistance elements such as thermistors are used as the inside temperature sensor 60 and the outside temperature sensor 61, and analog voltages generated at their terminals when energized are transmitted through the signal lines 60a and 61a.
It is connected to the control device 1 via.

Among the various switches on the operation panel 2, the air conditioner switch 65, the inlet changeover switch 66, and the economy switch 67
One end of the short internal air switch 68 is grounded, and the other end is connected to the control device 16 via an open/close contact, the first three being operation memory type switches, and the remaining short internal air switch 68 being a self-reset type switch. It is.

As will be described in detail later, when the short air switch 68 is closed, this fact is held as an electrical signal within the control device 1.

The main switch 64 on the operation panel 2 has one end connected to the ignition key switch 4 and the other end connected to the blower motor 14 and the electrical drive members 52, 54, 55, 57.
It is connected to.

Since the other end of the blower motor 14 is connected to the power supply line, the blower motor 14 rotates while the main switch 64 is closed.

The other ends of the power wires of the electrical drive members 52, 54, 55, and 57 are connected to the control device 1, and the power wire 50a of the electromagnetic clutch 50 among the electrical drive members is also connected to the control device 1. A power supply path is established via the control device 1.

The operating power for the control device 1 is supplied through the ignition key switch 4 without going through the main switch 64.

Therefore, the ignition switch 4 is used as the control device 1.
It operates when it is closed.

However, as described above, unless the main switch 64 is closed, the power supply to the blower motor 14 and the electric drive member will not be established, so the control device 1 is kept in the standby state 6 during that time.

The control device 1 includes a microcomputer 100 as a functional component that controls the entire air conditioner.

The microcomputer 100 described in this embodiment is
It is a 4-bit one-chip microcomputer MB8841 manufactured by Fujitsu Ltd., which has built-in ROM, RAM, I/O ports, timers, etc. in addition to a CPU.

For its internal structure, bottle connections, handling, etc., the MB8840 Synose User's Manual published by Fujitsu Limited can be used.

The control device 1 includes coupling circuits and processing circuits for operatively coupling the microcomputer 100 with information input means and electrical drive members.

First, as a circuit for inputting an analog signal to the microcomputer 100, a preamplifier circuit group 110, an analog multiplexer 120, and an analog-to-digital conversion circuit (A-D conversion circuit) 130 are used.

The amplifier circuit group 110 includes individual preamplifier circuits 111, 112, and 113 that independently preamplify each signal from the inside air sensor 60, the outside air sensor 61, the damper opening sensor 62, and the temperature setting device 63. , 114.

For the elements 6 whose total resistance changes, such as the inside air sensor 60 and the outside air sensor 61, the circuit shown in FIG. 3 is used as the preamplifier circuits 111 and 112.

In FIG. 3, a resistor 111a is connected in series with an element 6' representing the inside air sensor 60 and the outside air sensor 61, and the voltage at the connection point, the variable resistor 111b, and the resistor 111c are connected in series.
The output voltage of the reference voltage generator consisting of
11a, to obtain an amplified voltage corresponding to the difference C between the two voltages.

In cases where the output signal is already a voltage signal, such as the damper opening sensor 62 and the temperature setting device 63, the circuit shown in FIG. 4 is used as the preamplifier circuits 113 and 114.

In FIG. 4, the voltage from the element 6" representing the damper opening sensor 62 and the temperature setting device 63 and the variable resistor 113 are shown.
a and the output voltage of a reference voltage generator consisting of a resistor 113b are input to a differential amplifier circuit using an operational gamma amplifier 113c to obtain an amplified voltage according to the difference between the two voltages (
This is configured.

3 and 4. In the two types of preamplifier circuits 6 shown in FIGS. Used to convert to an easier level.

Analog multiplexer 120 is analog switch 1
21, 122, 123, 124 and their system? It consists of inverters 125, 126, 127, and 128 connected to the gates, and each input terminal of the inverters 125 to 128 is an input/output port R of the microprocessor 100.

- Pin R of R15. -R36 is connected.

The analog multiplexer 120 switches the analog switches 121 to 12 in the order specified by the microcomputer 100 (at this time, the output from the pin becomes O level).
4 are individually turned on, and input one output voltage of the preamplifier circuit 110 to the A/D converter circuit 130 in sequence.

The A-D conversion circuit 130 includes a voltage comparator 131 and a ladder voltage generator 132.
The input terminal is parallel output port 0 of the microcomputer 100.

~0, and the output terminal of the voltage comparator 131 is connected to pin R4 of the input/output ports.

This type of A-D conversion circuit 130 is, for example,
978) Nippondenso Public Technical Report Vol.
1 1 , A76G was introduced as a temperature detection circuit, but since it has been known for a long time, a description of its operation will be omitted.

Microcomputer 100 has parallel output port 0.

~Binary code output from 0 and input/output port 1-R.

The input signal level of pin R4 of ~R15 and 6 allow the analog signal to be recognized as a digital quantity.

An on/off signal amplification circuit 140 is used as a circuit for inputting a switch signal to the microcomputer 100C.

The on/off signal amplification circuit 140 generates an inverted voltage signal with a binary level depending on whether one terminal of the switches 65 to 68 used is at the ground voltage due to contact closure or in an open state for selection of the operation mode. Individual amplifier circuit 1
41, 142, 143, and 144, and each output terminal is a non-latch input port K of the microcomputer 100.

~ Connected to K3.

These amplifier circuits 141 to 144 have 6 circuits as shown by reference numeral 141. When the switch contact is closed, the transistor 141 is turned on and generates a 1-level signal at its collector, and the switch contact is opened. In this state, the transistor 141 is turned off and the collector becomes O level.

The microcomputer 100 has an input port K.

- By determining whether each pin of K3 is at the 1 level or the O level, the operating states of the switches 65 to 68 can be recognized.

The microcomputer 100 drives the electromagnetic clutch 50, the electromagnetic valve 52 that drives the internal/external air switching damper 13, the electromagnetic valves 54 and 55 that drives the temperature control damper 18, and the air outlet switching damper 21, which are electrically driven members. An on/off signal amplification circuit 150 is used to switch between energizing and deenergizing the solenoid valve 57.

Solenoid valves 52, 54, 55, 57 excluding the electromagnetic clutch 50
Individual amplifier circuits 151, 153, 154 that operate
, 155 are constructed so as to directly energize the solenoid valve using two transistors 151a and 151b which operate in reverse, for example as shown in FIG.

Further, the amplifier circuit 152 that operates the electromagnetic clutch 50 is
Since a large current output is required, relay 152a is used as shown in Figure 6.
are using.

Relay drive transistor 152b is inverter 152c
Both the one shown in FIG. 5 and the one shown in FIG. 6 energize the electric drive member 1 when the output of the microcomputer 100 is at O level.

The power supply circuit 170 supplies the power necessary for the operation of the control device 1. A constant voltage power supply of +5cm is created from the terminal voltage of the battery 3 by a known constant voltage power supply circuit 111 and is supplied to each circuit.

Also, the raw voltage from the battery 3 (usually 1
2v) is supplied to the on/off signal amplification circuit 150.

As a circuit attached to the microcomputer 100, there is a startup circuit 180.

The starting circuit 180 outputs an O level signal to the microcomputer 100(7)RES for a certain period of time when a voltage of 5V is applied by closing the ignition key switch 4.
It has the function of initializing the microcomputer 100 by inputting data to the ETI.

This microcomputer 100 outputs 1-level signals from all output ports during initialization.

A resistor and a capacitor are connected to the clock generator terminals Extai and Etal of the microcomputer 100 to form an IMHz clock generator.

Microcomputer MB8841 manufactured by Fujitsu Limited
There are several other terminals not shown, but they are omitted because they are not necessary in this embodiment.

The control device 1 may further include a display signal conversion circuit 160 for displaying the indoor air temperature when the ignition key switch 4 is closed.

The conversion circuit 160 is, for example, a decoder that converts the binary code sent from pins R12 to R15 of the input/output ports of the microcomputer 100 into individual logic signals, so that the conversion circuit 160 converts the light emitting diode group 2 according to the internal temperature.
A predetermined light emitting diode can be turned on from '.

The light emitting diode group 2' may be provided in the display panel.

Next, the temperature control method and each operation mode will be explained.

In FIG. 7, which diagrammatically illustrates the operation of the air conditioner, the deviation between the signal T2 indicating the set temperature and the signal Tr based on the measured value of the inside air temperature by the inside air temperature sensor 60l is detected by the deviation detection unit 201. The temperature control damper 18 is driven to raise or lower the temperature of the controlled object (air in a single room) 200 according to the deviation.

As a result, the temperature of the controlled object 200 having a predetermined heat load changes, and this change is fed back to the deviation detection unit 201 as a change in the signal Tr indicating the measured value of the inside temperature sensor 60, and as a result, as a control, Inside air temperature Tr is set temperature T
Repeatedly adjust the opening of the six dampers 18 so that the distance approaches 2L.

However, the heat load on the controlled object 200 is not constant and varies depending on various factors.

In air conditioners for automobiles, there is a problem with response delays in the control system, including delays in heat propagation in the controlled object 200.
For example, there is a problem in that the inside air temperature Tr cannot be kept constant despite changes in the outside air temperature Tam.

Therefore, it is necessary to adopt predictive control, that is, to detect disturbance elements such as the outside air temperature Tam in advance to control the control target 2.
At the same time as the heat load of 00 is affected by the disturbance, a correction signal is also applied to the deviation detection section 201 to maintain the internal air temperature Tr stably.

In predictive control, six experimental calculations are made in advance to determine what corrections should be made under what conditions for other elements involved in temperature control in order to bring the inside air temperature Tr closer to the set temperature T2. put.

In this embodiment, the following calculation formula is used to drive the temperature adjustment damper 18.

K1=Kr+Kam+Kpo+CF+MP-(1)ΔK
p o = K2 − K, ・・・・・・・
・・・・・・・・・・・・・・・(2) Here, the deviation △K
The opening degree of the temperature control damper 18 is controlled so that po converges within a predetermined range.

In equation (1), the term Kr for the inside air temperature and the term Ka for the outside air temperature
m and damper opening degree Kpo are obtained by multiplying the actually measured inside air temperature Tr, outside air temperature Tam, and damper opening degree Tpol by a predetermined gain constant, respectively.

The correction term MP is such that when the air conditioner cooler 15 is not operating (the compressor is off), that is, when the temperature of the air after passing through the cooler 15 is not 00C, the damper is opened accordingly. This is used to correct the degree.

This MP is shown as a value obtained by multiplying the inside air temperature Tr by a predetermined constant if the operation mode is the inside air type, or by the outside air temperature Tam if the operation mode is the outside air type.

The correction term CF is a correction term determined by comparing the set temperature T2 and the inside air temperature Tr and corresponding to the difference C in order to make the temperature control system accurately match the target set temperature T2.

Note that, as will be described later, since the inside air temperature Tr is not constant in the initial state when the air conditioner starts operating, the correction term CF
is used for calculation after waiting for the internal air temperature Tr to stabilize.

Note that in the predictive control of temperature control, it is possible to correct disturbance elements other than the outside air temperature Tam.

For example, correction terms related to the amount of solar radiation, the speed of the vehicle, the number of passengers, etc. may be added to the right side of equation (1).

Each term Kr, Kam, Kpo+C in Equation 6 of above (1)
Gain constants are determined so that F and MP are all values converted to temperature, and therefore, the added value K1 indicates the temperature of the controlled object 200 to be adjusted under the conditions indicated by these terms.

In the above equation (2), the temperature K to be controlled calculated using the equation (1) is compared with the target temperature K2-T2, and the difference ΔKpo is taken out for driving the damper.

In FIG. 7, which diagrammatically illustrates these calculations, solid rectangular frames 211, 212, 213, 214, and 215 indicate gain calculations for each term performed when performing the above calculations, and circles 201 and 205 is the deviation detection, circle 202, 20
3,204 indicates addition.

The switching of the upper and lower air outlets by the air outlet switching damper 21 is as follows:
It is automatically determined according to the opening degree of the temperature control damper 18, that is, the temperature of the blown air.

However, as mentioned above, the temperature of the blown air differs even when the damper opening is the same when the compressor is on and off, so in order to compensate for this, a correction value Ms is obtained through the correction process 2156, and the air outlet is switched.

The temperature control and operation mode control illustrated in FIG. 7 are executed in accordance with a control program stored in the ROM of the microcomputer 100.

Figure 8 shows an outline of the financial institution program. When the ignition key switch 4 is closed, the control device 1 is put into operation, and when power is supplied to the microcomputer 1006, the control program starts executing from start step 300.

Initialization is then performed by the startup circuit 180?7-, and an initialization routine 400 sets conditions that serve as the basis for program execution.

The initial setting routine 400 includes, for example, resetting a timer function, which will be described later, or first setting the correction term CF in the temperature control calculation formula 6 to O.

Then, the control program runs an initial temperature reading routine 500.
, analog signal reading and related processing routine 600, operation mode determination and related processing routine 700, temperature calculation and temperature adjustment damper drive routine 800 based on it, convergence correction processing routine 900, and then return to routine 500 or routine 600, and thereafter. Repeat this.

The time interval of this repeated processing (routines 600 to 8)
The processing interval of 00 (6 times approximately equal) is approximately several tens of milliseconds.

Details of the initial temperature reading routine 500 shown in FIG. 8 and the analog signal reading and related processing routine 600 are shown in FIG. 9.

Further, the operation mode determination and related processing routine 700 is shown in FIGS. 10 to 13, the temperature calculation and temperature adjustment damper drive routine 800 based on it is shown in FIG. 14, and the convergence correction processing routine 900 is shown in FIG. 16. show.

The numbers A, B, C, D, and E indicating the start, end, and branch ends of each routine in FIGS. 9 to 16 are made to match the same numbers in FIG. 8.

From FIG. 9C, an initial temperature reading routine 500 and an analog signal reading and related processing routine 600 will be explained.

First, in step 501ζ, one of the timer functions (timer 1) built into the microcomputer 100 is started.

Regarding the timer function that uses the timer/counter built into the microcomputer 100, refer to the above-mentioned M8884.
As explained in the 0 series user manual,
In this embodiment, timer 1 counts the number of overflows of the timer/counter by software (using a predetermined location in the RAM as the counter), thereby forming a two-minute timer.

Timer 2, which will be described later, similarly constitutes a 10 minute timer.

In the next step 502, the initial inside air temperature Tr(0) is read.

At this time, as described above with reference to FIG.
It is read as a digital quantity via the conversion circuit 130.

Note that in order to create an appropriate correspondence between the output signal of the internal temperature sensor 60 and the digital quantity read from the A-D conversion circuit 130, processing may be performed using software in the microcomputer 100. good.

The obtained value indicating the inside air temperature Tr is stored in RAM as the initial inside air temperature Tr(0)? This is stored.

Next, in steps 601, 602, 603, and 604, the inside air temperature Tr, outside air temperature Tam, and set temperature T2 are set, respectively.
, the opening degree Tpo of the temperature control damper is read, and the associated arithmetic processing is executed.

Gain multiplication is also performed for each term in order to execute the temperature calculation equation.

When the inside air temperature Tr is read, together with the digital quantity Tr, the inside air temperature term Kr is multiplied by a predetermined gain Kr, which is used for temperature calculation 6, and is used as a correction term when the compressor is turned off. A term Mi1 multiplied by a predetermined gain α and a term MSi multiplied by a predetermined gain β used in the correction calculation for selecting the upper and lower air outlets are calculated and stored at a predetermined location in the RAM. .

When the outside air temperature Tam is read, the digital quantity Tam and the outside air temperature term Kam multiplied by a predetermined gain Kam used for temperature calculation, a compressor for temperature calculation,
A term Mx. multiplied by a predetermined gain α is used as a correction term when off. and a term Mxi multiplied by a predetermined gain ε used for correction calculation for selecting the upper and lower air outlets are calculated and stored in the RAM.

When the set temperature T2 is read, the digital quantity T2 is directly stored in the RAM as a term K2 used for temperature calculations and other purposes.

When the damper opening degree Tpo is read, the digital quantity Tpo expressed as a percentage (%) is multiplied by a constant gain Kpo used in temperature calculation and stored in the RAM as a value Kpo.

Next, the inside air temperature display processing routine 605 is executed.
Since the temperature display itself has little to do with the gist of the present invention, its explanation will be omitted.

C indicates a branch input terminal, and initial temperature reading step 501
, 502 is not used, that is, at least 2, which is the effective storage period of the initial temperature Tr(0), as described later.
The program is repeatedly executed through this branch input terminal C until the minute has elapsed.

An outline of the operation mode determination and related processing routine 700 will be explained with reference to FIGS. 10 to 13.

In the two determination steps 701 and 702, the operation panel 2
Air conditioner switch 65 and economy switch 67
Pin K of the input port of microcomputer 100 determines whether it is open (off) or closed (on).

, K2 signal level 6.

Then, in determination step 701, if the air conditioner switch is off, that is, if the compressor is off, an operating mode in which the cooler 15 is not used is specified,
Processing is executed according to line a.

(Note that the judgment step indicated by a diamond indicates the flow in the horizontal direction.
Yes J (YES), downward flow
).

Since the operating mode is the compressor off, first, in output step 703, a compressor off command signal is output.

Referring to FIG. 2, the microcomputer 10
0 outputs a 1 level signal to pin R6 of the latch input/output ports, amplifies this in the on/off signal amplification circuit 152, and outputs it to the electromagnetic clutch 50 as a deenergization signal.

If the electromagnetic clutch 50 was in the energized state before then, it is switched to the deenergized state, and if it was in the deenergized state, it remains as it is.

Next, the microcomputer 100 executes the routine 70
4, the signal level of pin K1 of the input ports is checked, and it is determined whether the suction port changeover switch 64 is open (off) indicating an internal air type or closed (on) indicating an outside air type.
In addition, the signal level of pin K3 of the input ports is checked to determine whether the short internal air switch 64 is open (off) or closed (on), and the judgment 6 accordingly determines whether the internal/external air switching damper 13
energization or deenergization of the solenoid valve 52 is specified to drive the solenoid valve 52.

Then, the correction term MF in the above-mentioned temperature calculation formula is determined depending on whether it is an internal air type (including a short internal air type) or an outside air type.

That is, if the internal air type is used, M i (=αTr) is selected, and if the external air type is selected, MX (=γT am ) is selected.

Next, in order to switch between the top and bottom of the air outlet, calculate whether the opening degree of the temperature control damper 18 at 6 is equivalent to the opening degree of the blown air of 6 degrees, and if the calculated value 6 corresponds to the opening degree of the blown air of, for example, 30 degrees.
Input/output a signal specifying energization or deenergization of the solenoid valve 57 to drive the air outlet switching damper 21, such as lower air outlet 20 if it is above 30°C and upper air outlet 19 if it is below 30°C. Output from pin R7 of the port.

When the pin R7 is at the 1 level, the solenoid valve 57 is deenergized and the inside/outside air switching damper 21 opens the lower outlet 20. When the pin R7 is at the O level, the solenoid valve 57 is energized and the inside/outside air switching damper 21 is opened at the upper side. Opening the air outlet 19 is as described above.

FIG. 11 specifically shows a control program for the compressor after the a-line and when it is turned off.

In the inside/outside air determination step 705, when the suction port changeover switch 66 is closed, it is determined that it is an "inside air type", and the step 7
At 06, the solenoid valve 5 is activated to set the inside/outside air switching damper 13 to the inside air side.
2 (pin R9l of the input/output port of the microcomputer 100 generates a 0 level signal).

Next, a term Mi related to the inside air temperature Tr is read out from the RAM and set as a correction term MP for temperature calculation.

In other words, since the compressor is off and an inside air type, the temperature of the air sent from upstream of the temperature control damper 18 is not 00C (the temperature of the air after passing through the cooler 15 when the compressor is on), but the inside air temperature Trl. Since the inside air temperature Tri is almost equal, if the inside air temperature Tr is 0°C or higher, the temperature control damper 18 is moved closer to the cooling side (heater 1
6, the proportion of air passing through the bypass passage 17 is increased.

)6 is driven, and if the inside air temperature Tr is below O'C, the correction term MP is determined so that the heating side (6) is driven.

As mentioned above, Mi is calculated by multiplying the inside air temperature Tr by the gain constant α, but the gain constant α is an experimental result of investigating the relationship between the inside air temperature Tr, the damper opening degree, and the temperature of the blown air at that time. Determined by data.

Note that when the compressor is on, such correction is not necessary, so the correction term MP is set to 0.

Steps 708, 709, and 710 perform arithmetic processing to determine the upper and lower positions of the air outlet.

When the compressor is on, if the damper opening is 60%, for example, and the temperature of the blown air is 30°C, then if the damper opening is smaller than 60%, the outlet can be moved up or down. The air blowing out automatically when the head is cold and the feet are hot, but when the compressor is off, it is only possible to switch the blowout outlet depending on the damper opening degree 6. Therefore, the relationship between the damper opening degree and the blown air must be corrected depending on the temperature of the blown air.

In step 108, the correction term Ms is the inside air temperature T.
Select the value Msi obtained by multiplying r(t by the gain constant β.

Then, in step 7096, the damper opening degree S indicating the switching point of the air outlet is corrected.

Here, D is a value indicating the damper opening degree, for example, 60%, which provides a blow-out air temperature, for example, 30° C., which is the boundary for switching the air outlet when the compressor is on.

Next, in step 7106, the actual damper opening degree Kpo
is larger than the damper opening degree S, which is the switching point of the air outlet, and if yes, the solenoid valve 57 is activated to blow out warm air mainly to the lower body of the occupant from step 711c.
When the actual damper opening degree Kpo is smaller than the boundary value S in step 710, the lower air outlet 20 is opened from the switching damper 216 by outputting the deactivation signal ◆.
In order to blow out cold air mainly to the upper body of the occupant from 126, the electromagnetic valve 57 is energized to output cold air, and the switching damper 21 opens the upper air outlet 19.

If the determination is "no" in the inside/outside air determination step 705, it is determined in the short-term inside air determination step 113 whether or not the inside air switch 68 is on for a short time.

If "No", it means that the outside air type is used, and the process moves to step 717; however, if "Yes", the internal air type is used for a certain period of time, for example, 10 minutes by timer steps 714, 715, and 716, and after 10 minutes, the outside air type is used. Switch formula 6.

As mentioned above, the short-time internal air switch 68 is a self-resetting type, so when it is temporarily closed, the process moves from judgment step 713 to step 714 and moves to step 715, where timer 2 as a built-in timer function is started. From step 706, the internal air type process described above is executed.

Then, in step 715, the timer 2 is started, and at the same time, a numerical value indicating that the internal air switch 68 has been closed for a short period of time is stored in a predetermined location of the RAM, and this is determined in a determination step 718.

Then, in timer determination step 7166, when it is determined that 10 minutes have elapsed, the numerical value stored in the RAM is erased.

In the case of the outside air type, first, in step 717, a deenergization indicator ♦ signal of the solenoid valve 52 is outputted to open the inside/outside air switching damper 13 to the outside air introduction port 12.

Next, the correction term MP for temperature calculation is changed to the outside air temperature Tam
Mx is determined by multiplying by the gain constant γ.

Steps 71 9 , 720 , and 721 are used to multiply the damper opening degree S, which determines the upper and lower positions of the six air outlets, by the constant gain constant ε, as in the case of the internal air type.
sx is corrected, and this is compared with the actual damper opening Kpo to determine the upper and lower positions of the air outlet.

In steps 722 and 723, in accordance with the determination, the solenoid valve 576 is deenergized or energized in order to drive the outlet switching damper 21.

Returning to Figure 10, air conditioner switch determination step 7
If 0H is checked and the answer is “no” (air conditioner switch is on), the economy switch 67 is turned on in the next judgment step 702.
is determined to be on or off.

If the economy switch is off (“no”), processing is executed according to line b so that the air conditioner is operated in the normal operation mode with the compressor on.

First, in step 724, the compressor turns on the finger ♦, that is, outputs a signal for energizing the six electromagnetic clutches 52 to operate the cooling cycle.

Next, in routine 725, it is determined whether it is an internal air type, an external air type, or a short time internal air type, and the internal/external air switching damper 18 is controlled according to the determination, and the opening degree of the temperature control damper 6 is also controlled. Executes air outlet switching.

Details of the routine 725 will be explained with reference to FIG. 12.

When the cooling cycle is operated in step 724, the correction term MP for temperature calculation is set to 06 in step 726, and the suction port changeover switch 66 is set in step 727 and 728c.
Check whether the short internal air switch 68 is on or off, and if the internal air type is specified, proceed to step 729 and output the energizing finger ◆ signal of the solenoid valve 52 to drive the internal/external air switching damper 13 to the internal air introduction side. If outside air type is specified, step 730
Then, the deenergization finger ◆ signal of the solenoid valve 52 is outputted to drive the inside/outside air switching damper 13 to the outside air introduction side.

Further, if the short-time internal air type is specified, tire processing steps 731, 732, and 733 cause the internal air type to be used for 10 minutes, and then switch to the outside air type.

Next, processing steps 734 and 73 switch the air outlet up and down.
5,736, γ31 is executed, but since the cooling cycle is in operation, the temperature of the air that has passed through the cooler 15 is constant at almost 0°C, so the opening degree Kp of the temperature control damper 18 is
The temperature of the blown air can be determined by o, so 3
The damper opening degree D (typically about 60% of the temperature of E is determined, and the energization and deenergization of the solenoid valve 52 is controlled.

FIG. 10 6 It is clear that the air conditioner switch judgment step 701 is "No" (air conditioner switch is on), and the next economy switch judgment step 70
If the determination in step 2 is "yes" (economy switch 67 is on), the process proceeds to line C and the air conditioner is controlled in the economy operation mode.

First, compressor on/off condition determination routine 73
8G, it is determined whether the internal air type or the external air type is specified, and the internal/external air switching damper 13 is driven accordingly, and if the short-term internal air type is specified, the short-time internal air processing routine is executed. Run 789.

When the inside air type or outside air type is specified, compare the target set temperature T2 and the inside air temperature Tr to determine whether it is necessary to cool down, that is, to obtain a large cooling effect due to the sudden cooling start-up C. When cool down is necessary, the air conditioner is operated in the normal mode with the compressor on until cool down is no longer necessary.

After the cool-down process, it is determined whether the target set temperature T2 can be obtained without operating the cooling cycle by comparing the set temperature T2 and the outside temperature Tam, and if the set temperature T2 cannot be obtained as a result of the determination, , the set temperature T according to line b
The air conditioner is operated in the normal mode with the compressor on until it is determined that 2 is obtained.

When it is determined that the target set temperature T2 can be obtained without operating the cooling cycle, a compressor-off control routine 740 is executed.

In this control routine 740, the operation of the cooling cycle is stopped, and at the same time, the intake port is switched to the outside air type C to operate the air conditioner.

The economy operation mode will be explained in detail with reference to FIG. 13.

First, at suction port determination steps 741 and 742, it is determined whether the internal air type, the external air type, or the short-time internal air type is specified.

In the case of the inside air type, the inside/outside air switching damper 13 is set to introduce outside air in step 743, and in the case of the outside air type, the inside/outside air switching damper 13 is set to introduce outside air in step 744, and in the case of the short-time inside air type, the timer processing step 745,
746, 746a for 10 minutes, 1
After 0 minutes, the outside air system will be used.

Short-time internal air processing steps 747, 748, 749,
Controls 750, 751, 752, and 753 are almost the same as the control when the combustor is turned on as explained in FIG. 12, and the only difference is that the determination as to whether it is an internal air type or an outside air type has already been made.

If it is not a short-time internal air type but an internal air type or an external air type, the drive command signal for the suction port switching damper 13 Steps 743 and 74
After outputting in step 4, a cool-down necessity determination routine consisting of steps 154, 755, and 756 is executed.

In step 754, the temperature difference P between the set temperature T2 and the inside air temperature Tr is calculated, and if this temperature difference P is smaller than the predetermined temperature difference B1, for example, 1.6°C, it is determined in step 755 that cool-down is not required ("Yes"). Also, if the temperature difference P is smaller than the temperature difference B+b, for example, 2.6°C, step 756
It is determined that cool-down is not necessary (“No”), and the temperature difference P
For example, when the temperature is higher than 2.6° C., it is determined that a cool-down is necessary, and control proceeds from step 756 to the normal operation mode when the compressor is turned on, as shown in FIG. 12, via the branch end b.

The reason why the temperature difference b is set to determine the temperature difference p in determination steps γ55 and γ56 is to prevent the compressor from repeatedly turning on and off by providing hysteresis at determination level 6. It is.

If it is determined that cool-down is not necessary, a capability determination process is performed in steps 757, 758, 759, and 76 to determine whether the target set temperature T2 can be obtained without operating the cooling cycle.
Executed at 0.

Is this ability determination process the set temperature T2? In contrast, it is determined whether the temperature of the air introduced is sufficiently low.

When this air conditioner is used for cooling, in principle, in order to stably match the inside air temperature Tr to the target set temperature without operating the cooling cycle, it is necessary to introduce outside air and set the outside air temperature Tam to the set temperature T2. must be sufficiently lower.

In this embodiment, when the temperature difference R between the set temperature T2 and the outside temperature T a m is calculated in step 757, the temperature difference R is, for example, 7°C or more when the cooling cycle is stopped (compressor is off). When the temperature is lower than 7℃, e.g. 10℃ or higher during cycle operation (compressor on),
It is determined that it is okay to stop the cooling cycle (person with the ability).

When the temperature difference R is smaller than the above value, it is determined that there is no capacity, and the compressor shown in FIG. 12 is controlled in the normal mode when turned on according to line b6.

If it is determined that the target set temperature can be obtained by stopping the cooling cycle, the electromagnetic clutch 5 is turned off in step 761.
The cooling cycle is stopped by outputting a de-energizing finger◆ signal of 0, and at the same time, in step 762, a de-energizing finger◆ signal of the solenoid valve 52 is outputted to switch the inside/outside air switching damper 13 to introduce outside air.

Furthermore, the correction term MF for temperature calculation is changed to the outside air temperature Tam
The related value Mxci: Determine.

Next, in steps 765, 766, 767, and 168, processing is performed to determine the upper and lower positions of the air outlet.

The processing from step 763 to step 768 is the same as from step 718 to step γ23 in FIG. 11, which was explained as the control when the compressor is turned off.

Next, the temperature calculation for driving the temperature adjustment damper 18 and the damper driving routine based thereon will be explained with reference to FIG. 14.

In steps 801 and 802, the greenhouse calculation formula (1
), (2) is calculated.

Among the necessary terms for this calculation, K2, Kr, Kam,
Kpo is stored in the RAM in the analog signal reading and related processing routine (see Figure 9), and MF is stored in the RAM in the operation mode determination and related processing routine (see Figure 10).
CF is set to 0 in the initial setting routine, and steps 801 and 8
02 simply reads these values from RAM and calculates them.

△Kpo obtained as a result of calculation is calculated from various operating conditions of the air conditioner at that time, and is based on the temperature K1 of the controlled object to be controlled and the target set temperature set by the temperature setting device 63. It shows the deviation from K2 (=T2).

Next judgment step 808, 804, 805, 806, 8
In 07,808, it is determined whether the deviation △Kpo is "approximately O", thicker, or smaller,
When the deviation △Kpo is approximately O, both the solenoid valves 54 and 55 are deenergized in step 809 to stop the temperature control damper 18, and when the deviation △Kpo is greater than "approximately O", the inside air temperature Tr is set. To reach the temperature T2, it is determined that the temperature K1 to be controlled is "low", that is, the temperature of the blown air is low, and in step 811, the solenoid valve 55 is energized to move the damper 18 in a direction that increases its opening degree. and when the deviation △Kpo is smaller than "approximately 0", the temperature K to be controlled to bring the inside air temperature Tr to the set temperature T2,
is high, that is, the temperature of the blown air is high, and in step 810, the solenoid valve 55 is energized to drive the damper 18 by 1 in the direction in which the opening degree thereof becomes smaller.

Here, the determination steps 803 to 808 include the solenoid valves 54 and 5.
In order to prevent the energization and deenergization of the solenoid valve 5 from switching violently in a short period of time, hysteresis is added to the determination level of the deviation △Kpo with a predetermined width, and the solenoid valve 54 and the solenoid valve 55 are 6 to prevent the energization from switching at once.

Determination steps 808 and 804 are performed until then when the solenoid valve 54.
55 is energized (on) or deenergized (off).

If either one is activated, steps 805 and 8
06? From this, it is determined whether to maintain the energization or switch to deenergization based on the magnitude of the deviation ΔKpo.

Further, when neither of the solenoid valves 54 and 55 is energized, steps 805 and 806! From this, it is determined whether to maintain the deenergized state or to energize one of them.

The functions of determination steps 803 to 808 are illustrated in the 15th
It will look like the figure.

In FIG. 15, a solid line 55a shows the relationship between the energization and deactivation of the solenoid valve 55 and the deviation ΔKpo, and a solid line 54a shows the relationship between the energization and deactivation of the solenoid valve 55 and the deviation ΔKpo.
4 shows the relationship between energization and deenergization and deviation ΔKpo.

When the solenoid valve 55 involved in temperature rise is switched from deenergized to energized, the process proceeds from the 1° C. determination step 807 to the switching step 811; ℃ determination step 806 to switching step 8
Proceed to 09.

Further, when the solenoid valve 54 involved in temperature reduction is switched from energized to de-energized, the process proceeds from the -0.4°C judgment step 810 to the switching step 810, and conversely, when it is switched from energized to de-energized, it is 0°C. From the determination step 805 to the switching step 809
Proceed to.

When the deviation △Kpo is "approximately O" between 0°C and 0.6°C, the solenoid valve 54. 55 are both deenergized.

If either of the solenoid valves 54 or 55 is energized, the temperature control damper 18 is in operation, which means that the temperature control is not yet stable. Processing routine 600 (see Figure 9)
Return to

branch end C until both solenoid valves 54 and 55 are deenergized.
The process is repeated through .

When both electromagnetic valves 54 and 55 are deenergized, the process moves to timer determination step 812.

The timer determination step 812 is the initial temperature reading routine 50.
It is determined whether two minutes have elapsed since the timer 1 was started at 0 (see FIG. 9).

Then, while two minutes have not elapsed, the process returns to the analog signal reading and related processing routine 600 through the branch terminal C.

That is, once the initial temperature reading routine 500 is passed, the analog signal reading and related processing routine 600 and the operation mode determination and related processing routine are executed for at least two minutes and until both the solenoid valves 54 and 55 are energized. 70
0, and temperature calculation and the temperature adjustment damper driving routine 800 based on the temperature calculation is repeatedly executed.

In addition, in a general air conditioner, the opening degree of the temperature control damper 18 is stabilized in 2 minutes unless there is a large change in the outside air temperature Tam or the like.

If both of the solenoid valves 54 and 55 are deenergized and two minutes have elapsed since the initial reading of the inside air temperature Tr(0), the process moves from determination step 812 to the convergence correction processing routine shown in FIG. .

In the convergence correction processing routine, as a result of the temperature calculation and the processing of the temperature adjustment damper drive routine 800 based on the temperature calculation,
When the temperature control damper 18 stops and the temperature of the blown air becomes stable, steps 901, 902, and 903 read out the internal air temperature Tr (read in the analog signal reading and related processing routine 600) from the RAM and use it.

) is compared with the initial temperature Tr(0) at the time of starting the timer 1, and it is determined whether the inside air temperature Tr has stabilized within approximately 2 minutes.

If the temperature is not stable, the process returns to terminal A and the process starts from the initial temperature reading routine 500 again.

When the inside air temperature Tr remains approximately the same for 2 minutes, the temperature control based on the calculation formulas (1) and (2)C is considered to be stable.

Next steps 904, 905, 906, 907, 9
08, compare the internal air temperature Tr at that time and the target set temperature T2, and if there is a difference, correct the temperature calculation formulas (1) and (2), and start the program from terminal A ( I'm back.

In internal air temperature Tr stability determination steps 901 to 908,
First, in step 901, the temperature difference △Tr between the internal air temperature Tr at that time and the initial internal air temperature Tr (0) is calculated, and in judgment steps 902 and 903, the difference △Tr is determined to be O±1, for example.
Determine whether it is at °C.

When the temperature difference ΔTr for 2 minutes is within 0±1° C., it is considered that the temperature control using the temperature calculation formula is stable.

Then, in step 904, the temperature difference Y between the target set temperature T2 and the indoor temperature Tr is calculated, and in judgment steps 905 and 906, the temperature difference Y is determined to be, for example, O±1°C.
Determine whether or not it exists.

When the temperature difference is +1°C or more, the correction term CF in the temperature calculation formula (initial setting is 06) is set to a smaller value by cf in order to correct the temperature control damper 18 to a further position on the heating side. do.

Also, when the temperature difference Y is -1°C or more, the temperature control damper 18
In order to further correct the position to the cooling side, the correction term CF is changed to c
Increase the value by f.

The value of cf may be approximately a value corresponding to a change in air temperature of, for example, 0.8°C.

When the correction term CF is newly calculated in steps 907 and 908, the terminal A returns to the beginning of the program (initial temperature reading routine) by 6 steps, and when the damper opening degree stabilizes after at least 2 minutes, the inside air temperature Tr stabilizes. Judgment step 901
~903 is executed, and the set temperature T2 is set again in step 904.
When the temperature difference Y is not within 0±1° C., the value of the correction term CF is roughly increased or decreased by cf.

When the temperature difference YfJSO is within ±1°C, the inside air temperature T
This indicates that r has almost converged to the target set temperature T2, and the correction term CF is changed to 6 and the program returns from terminal A to the beginning of the program, and as long as the main switch 64 is closed, Each functional element of the air conditioner is repeatedly controlled according to the program.

Even if the operating mode, temperature control set temperature, outside temperature, etc. change while the air conditioner is operating, the program repeats every few tens of milliseconds, so it will follow the changes with almost no delay. .

In this embodiment, the convergence correction processing routine is executed approximately every two minutes, but this interval may be set to several tens of seconds to several minutes.

In addition, the judgment range of the temperature difference Y between the inside temperature command Tr and the set temperature T is narrowed to 0±1°C, and the increase/decrease value cf of the correction term CF is
By making the temperature smaller than 0.8° C. (the temperature of the blown air), the accuracy of temperature control convergence can be improved.

Further, the interval at which the convergence correction processing routine is executed may not be fixed to, for example, two minutes, but may be changed during the control.

For example, it takes extra time for the inside air temperature Tr to stabilize for a while after the air conditioner starts operating. The execution interval of the correction processing routine may be changed on the program according to the elapsed time from the start of operation or the temperature difference between the set temperature T2 and the inside air temperature Tr.

Further, as a method for determining whether or not the inside air temperature Tr has stabilized, there are two ways to determine whether or not the inside air temperature Tr has become stable: stopping the temperature control damper 18 as described above, and checking the temperature difference between the initial inside air temperature Tr (0) and the inside air temperature Tr after 2 minutes. In addition to determining whether or not the temperature adjustment damper 18 is continuously in a stopped state for a predetermined period of time, a method may also be used.

Even if the increase/decrease value cf of the convergence correction term CF is not constant,
It may be changed depending on the magnitude of the temperature difference between the inside air temperature Tr and the set temperature T2.

As described above, the sixth aspect of the present invention has the excellent effect of reducing the operating rate of the cooling mechanism without impeding the cool-down effect.

[Brief explanation of the drawing]

The attached drawings show an automobile air conditioner to which the present invention is applied. Fig. 1 is a block diagram of the overall system, Fig. 2 is an electrical connection diagram of the electrical control system, and Figs. A detailed electrical wiring diagram of the illustrated preamplifier circuit 110, FIGS. 5 and 6, and an on/off signal amplification circuit 150 illustrated in FIG.
Detailed electrical wiring diagram, Figure 1 is a schematic diagram of temperature control, Figure 8
The figures are a flowchart showing an outline of the control program by the microcomputer 100ζ shown in FIG. 2, FIGS. 9 to 14, and FIG. , No. 9
The figure shows an initial temperature reading routine 500, an analog signal reading and related processing routine 600, a driving mode determination and related processing routine 700, Fig. 11 shows a processing routine following the air conditioner switch and turning off in Fig. 10; 12
The diagram shows the air conditioner switch in Figure 11, the processing routine that continues after turning off and the economy switch, and Figure 13 shows the processing routine for the first
The economy switch in Figure 1, the processing routine following turning on,
Figure 14 shows temperature calculation and damper drive routine 8 based on it.
00, FIG. 16 shows a convergence correction processing routine 900, FIG. 15 is a hysteresis characteristic diagram in damper drive to explain the routine in FIG. 14 in the control program, and FIG. 17 is a diagram showing the configuration of the control device of the present invention. FIG. 2 is a functional block diagram showing the characteristics of the 1... Control device, 10... Ventilation duct, 14... Blower motor, 15... Cooler, 16... Heater, 17 ...Bypass passage, 18...Temperature adjustment damper, 22.
...A cooling cycle as a cooling mechanism including the cooler 15, 23...An engine as an onboard power source, 50...An electromagnetic clutch, 60...
Inside air temperature sensor, 61... Outside air temperature sensor, 6
3...Target temperature setting device, 64...Main switch, 65...Air conditioner switch, 10
0...Microcomputer.

Claims (1)

[Scope of Claims] 1. Automatic temperature control system for a vehicle air conditioning unit comprising a ventilation duct 11 for sending air toward the vehicle interior, a cooler having a cooling mechanism driven by an onboard power source, and a heater. In the vehicle air conditioning control method for controlling the vehicle interior temperature to a target temperature by adjusting the amount of heat exchanged between the cooler and the heater, the first step is to determine whether or not the temperature control system is out of a transient state that lowers the vehicle room temperature. and a second determination as to whether or not the temperature outside the vehicle compartment is lower than a predetermined temperature difference with respect to the target temperature. A vehicle air conditioning control method, characterized in that when the answer is positive, the cooling mechanism is cut off from the on-vehicle power source, and when at least one of the answers is negative, the cooling mechanism is connected to the on-vehicle power source 6. 2. The air conditioning control for a vehicle according to claim 1, wherein the first half-temperature is determined based on whether the temperature inside the vehicle has reached approximately the target temperature. Method. 3. A ventilation duct 1 for sending air toward the vehicle interior, a blower motor that generates an air flow toward the vehicle interior G through the ventilation duct 6, and a blower motor that generates an air flow toward the vehicle interior G through the ventilation duct 6; a heat exchange means which exchanges heat with the air flow and is capable of adjusting the amount of heat exchange by 6, including a cooler having a cooling mechanism of 6; an inside temperature detection means for generating a signal, an outside temperature detection means for generating a second signal corresponding to the temperature outside the vehicle interior, a means for generating a third signal corresponding to the target set temperature inside the vehicle interior; (a) a first control output signal indicating the amount of heat exchange in the six heat exchange stages based on the first, second, and third signals O; (b) a second means for comparing the first signal and the third signal to determine whether the temperature in the vehicle interior has reached the vicinity of the target temperature; (c) ) third means for comparing the second signal and the third signal to determine whether the temperature outside the vehicle compartment is lower than a predetermined temperature difference with respect to the target temperature; and (d) When the determination results of the second means and the third means are both positive, the cooling mechanism is cut off from the on-vehicle power source, and when at least one of the determination results is negative, the cooling mechanism is disconnected from the on-vehicle power source. a fourth means for generating a second control output signal, connected to six power sources, and adjusting the amount of heat exchange in the heat exchange stages in response to the first control output signal from the digital control means; a first electric drive means; and a second electric drive means for connecting and disconnecting the cooling mechanism to the vehicle-mounted power source 6 in response to a second control output signal from the digital control means. Features of vehicle air conditioning control equipment.