JPS63244B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a vehicle air conditioning control device that has a plurality of air outlets and determines the distribution of air volume.

[Conventional technology]

It is conventionally known to change the distribution of air volume to the upper and lower parts of the vehicle interior. For example, Japanese Patent Application Laid-Open No. 55-47914 discloses that depending on the temperature of the air blown out, cool air is concentrated in the upper part of the vehicle interior and warm air is concentrated in the lower part of the vehicle interior. The same thing is also disclosed in Publication of Utility Model Publication No. 54-12819.
Therefore, in the conventional device, warm air is blown out in a concentrated manner toward the lower part of the vehicle interior during winter. However, in such a heater blowout mode, when solar radiation enters the passenger compartment and hits the occupants, this solar radiation mainly hits the upper body of the occupant, and the occupant sometimes feels an excessive heat sensation in the upper body, but the Since the blown air hardly reaches the upper body, it cannot soften the thermal sensation and has a disadvantage of poor feeling.

By the way, in an air conditioner with a built-in automatic temperature control device, it is known that the temperature of the outlet air is corrected according to the amount of solar radiation (such as Publication of Utility Model Publication No. 49-6021). As a result, the temperature of the air blown to the lower body of the occupant in the heater blowing mode described above decreases, giving the occupant a cooling sensation, which, when combined with the thermal sensation of the upper body, further worsens the feeling.

Publication number 54-31468 or Publication number 54-31469
According to the air conditioning control device described in the publication, it is disclosed that the solar radiation correction is disabled or reduced during the heater blowout mode in order to eliminate the above-mentioned problem with the solar radiation correction.

However, even with this method, the above-mentioned feeling of the upper body of the occupant cannot be improved.

[Problem that the invention seeks to solve]

In view of the above-mentioned points, the present invention has been developed only when there are conditions for heater mode air blowing, and when solar radiation above a predetermined level is detected, the temperature of the air blown toward the upper body of the occupant is such that it does not give a thermal sensation. The purpose of this system is to improve the air conditioning feeling for passengers by setting the air outlet to a bi-level blowing mode.

[Means for solving problems]

Therefore, in the present invention, in order to achieve the above object, as shown in FIG. Selection means M for outputting a selection signal for selecting either a heater mode blowout in which air is blown to the lower part of the vehicle interior from the provided lower blowout outlet, or a bilevel mode blowout in which air is blown out from both the above-mentioned blowout outlets. ₁ , mode switching means _M2 for switching the modes of the vent mode blowout, heater mode blowout, and bilevel mode blowout in response to the selection signal from the selection means _M1 ; and a response responsive to the magnitude of the amount of solar radiation. means _M3 ; and according to the selection result of the selection means and the response means, when the selection means has selected heater mode blowing and the amount of solar radiation is above a predetermined level, among the selection results of the selection means, heater mode is selected. a modifying means _M4 that outputs a modification signal for modifying the mode blowout to a bilevel mode blowout; and when it is determined that the temperature of the air blown from the upper blowout is equal to or higher than a predetermined temperature, the correction signal of the correction means is restricted. A technical means is adopted in which a restriction means _M5 is provided.

[Effect]

According to the above technical means, when the selection means _M1 selects the heater mode blowing when the amount of solar radiation is below a predetermined level, the mode switching means _M2 switches the air blowing state to the heater mode blowing. Therefore, warm air is blown out from the lower air outlet to the lower body of the occupant.

Here, when the amount of solar radiation exceeds a predetermined level, a correction signal is output from the correction means _M4 , and the mode switching means _M2 switches the heater mode blowout to the bi-level mode. However, if the temperature of the air blown out from the upper outlet is equal to or higher than a predetermined temperature at that time, the mode switching means _M2 maintains the heater mode due to the action of the limiting means _M5 . In other words, according to the present invention, the bi-level mode is activated only when the temperature of the air blown out from the upper air outlet is at a temperature that does not give a thermal sensation to the upper body of the occupant. Furthermore, high-temperature wind is prevented from being blown onto the upper body of the occupant.

〔Example〕

The present invention will be described below with reference to embodiments shown in the accompanying drawings. In this embodiment, the present invention is applied to a generally known automobile air conditioner of a cold air/warm air mixing type. An outside air intake port 1a for introducing outside air and an inside air intake port 1b for circulating inside air are formed on the upstream side of 1.
Both intake ports are opened and closed by an internal/external air damper 2.
In the ventilation duct 1, toward the downstream side, there are installed an electric blower (blower motor) 3, an evaporator 4 that forms part of the cooling cycle CC, a heater core 5 that forms part of the cooling water cycle HC of the engine EG, and this heater core 5. A temperature control damper (A/M
dampers) 7 are arranged in order. Ventilation duct 1
Upper and lower air outlets 1c and 1d are formed at the most downstream part of the duct to blow out the air whose temperature has been adjusted in the duct to the upper and lower parts of the vehicle interior, and both air outlets are connected to the air outlet damper 8. It is opened and closed by twisting.

The control device 10 receives and processes various information signals in order to perform temperature control and various operation mode controls, and electrically instructs the operation of the functional elements 1 to 8 described above.

As a means for inputting various information signals to the control device 10, an analog voltage signal Tr' corresponding to the temperature inside the vehicle is generated. An inside temperature sensor 21 that includes a heat-sensitive resistor, and an outside temperature sensor 2 that includes a heat-sensitive resistor that generates an analog voltage signal Ta' corresponding to the temperature outside the vehicle interior.
2. Temperature setter 23 including a potentiometer that generates an analog voltage signal Ts' according to the set temperature (set position); Opening sensor 24 of the temperature control damper 7;
As a response means, a solar radiation amount sensor 25 including a phototransistor that generates an analog voltage signal Tsun' corresponding to the amount of solar radiation incident on the vehicle interior, and a cooling sensor including a heat-sensitive resistor that generates an analog voltage signal TE' corresponding to the downstream temperature of the evaporator 4. Air temperature sensor 26, analog voltage signal corresponding to hot water temperature passing through heater core 3
A water temperature sensor 27 including a heat-sensitive resistor that generates Tw', and a switch panel 11 that generates on/off signals by operating a group of switches such as start, stop, and operation mode selection are provided.

In addition, the engine EG is used as a means for operating functional elements according to electrical commands from the control device 10.
An electromagnetic clutch 31 disconnects and connects the driving force from the cooling cycle CC to the cooling cycle CC, and an electromagnetic valve 3 opens and closes the cooling water circulation path to the heater core 5 in the heating cycle HC.
2, and an inside/outside air damper 2, a temperature control damper 7,
Solenoid valve-controlled negative pressure actuators 33, 34, which provide driving force for opening and closing the outlet damper 8 using engine negative pressure;
35 are provided. The display panel 12 is the control device 1
The operating state of the device is indicated by an output signal of 0.

The control device 10 receives power from the vehicle battery 14 when the ignition switch 13 of the vehicle is turned on, and becomes operational.

As shown in FIG. 2, the control device 10 is a digital computer (microcomputer) that performs information processing based on a preset control program.
10a, signal input means 21, 22, 23, 24,
Analog voltage signals from 25, 26, and 27 are selectively converted from analog to digital to the computer 1.
an analog input interface 10b that inputs to the computer 10a; a digital input interface 10c that formats the on/off signals of each switch from the switch panel 11 and inputs them to the computer 10a;
Functional element 31 output from computer 10a
Amplifying circuit 10 that amplifies the operation command signal of ~35
d, a digital-to-analog conversion circuit 10e that converts a digital value indicating the rotational speed of the blower motor 3 outputted from the computer 10a into a DC voltage for driving the blower motor 3, an information processing clock generation circuit 10f, and a constant voltage circuit; Immediately after turning on the ignition switch 13, the computer 1
It consists of an initialization circuit (none of which is shown) that starts the operation of 0a.

FIG. 3 shows the flow of the control program of the computer 10a, and the operation of the apparatus will be explained below with reference to FIG.

When the ignition switch 13 is turned on, the computer 10a is initialized, and then it repeatedly checks via the interface 10c whether the operating switch for the air conditioner in the switch panel 11 is turned on.

When the operation switch in the switch panel 11 is turned on, the following processing of the computer 10a starts at a start step 100, and first, at an initial setting step 101, the computer 10a
The internal state of 0a and the operating state of the air conditioner are set to the initial state. In this process, the amplifier circuit 1
The electromagnetic clutch 31 and the electromagnetic valve 32 are energized via 0d to start heat exchange in the heat exchangers 4 and 5. Next, in the data input step 102, the signal input means 21, 22, 23, 24, 25, 2
Analog voltage signals Tr′, Ts′, from 6, 27
Ta', Ar', Tsun', Tw', TE' are transferred to digital data Tr, Ts, Ta,
Ar, Tsun, Tw, and TE are input in sequence, and the on state of the operation mode switch on the switch panel 11 is input via the interface 10c.

Next, in step 103, the blowout temperature TAO required to obtain the set temperature is calculated using the following formula programmed in advance.

TAO=Ks・Ts×Kr・Tr−Ka・Ta −Ksun・Tsun+c However, Ks, Kr, Ka, Ksun, and C are constant terms set in advance. Subsequently calculated outlet temperature
Opening degree of A/M damper 7 to actually obtain TAO
Calculate As. The calculation method is based on the blowout temperature TAO vs. damper opening characteristic shown in Figure 4, which was obtained through experiments in advance.
This may be based on an approximation formula that predetermines the As characteristics, or may take the form of a memory map. In FIG. 4, Tw is the hot water temperature (according to the sensor 27), TE is the cold air temperature (according to the sensor 26), and KE is a constant term.

Next, in step 104, a blowout mode is selected according to the calculated blowout temperature TAO. This selection is made when the blowout temperature TAO is as shown in Figure 5.
This is done by determining which region is divided into 25±1℃ and 30±1℃.

Next, in steps 105 to 111, if the outlet mode selected in step 104 is vent, the actuator 35 is commanded to open the upper outlet 1c (step 106); 8 to the intermediate position shown by the dashed line (step 110), and if there is no solar radiation, the heater is commanded to blow out (step 111). According to the outlet temperature characteristics (see Figure 6), the conditions under which the vent outlet temperature Taov is equal to or less than 30℃ (the outlet temperature Taov is a predetermined value)
If the temperature is below TA), switch to bi-level blowing (step 110), and if it is 30°C or higher, keep heater blowing (step 111). In addition, Figure 6 shows the heater blowout temperature at bi-level.
This shows a state in which TAOH and the vent outlet temperature TAOV are different. In order to obtain such characteristics, the A/M damper 7 and heater core 5 are arranged in the air conditioning unit, or a special auxiliary duct bypasses the A/M damper 7 and heater core 5 and leads to the upper air outlet 1c. A known configuration is used, such as providing a bypass passage and opening this bypass path in conjunction with the outlet damper 8 during the bi-level outlet mode.

However, while this device is operating, the car temperature may
The blowout temperature is adjusted so that Tr approaches and maintains the target temperature Ts.
TAO is determined, and the A/M damper opening degree As is adjusted based on this. Heater airflow, vent airflow, and bilevel airflow are selected according to the determined airflow temperature TAO. When selecting the heater outlet, if solar radiation exceeding a predetermined amount is detected, the outlet temperature TAOV from the upper outlet (vent outlet) will be automatically adjusted within a range that does not exceed a predetermined temperature, e.g. 30℃. Select bi-level callouts.

As a result, while blowing warm air to the lower body, it is possible to remove excessive heat sensation from the upper body exposed to sunlight. Additionally, this device can prevent hot air from being blown onto the upper body.

Next, in step 112, the air volume W is calculated from the outlet temperature TAO using a predetermined relational expression or memory map in order to obtain the characteristics shown in FIG.

In step 113, the actuator 34 is controlled so that the damper opening degree As calculated in step 103 is achieved, and the temperature is controlled by the A/M damper 7. Next, in step 114, a digital value is output to the digital-to-analog conversion circuit 10e in order to supply the blower motor 3 with an applied voltage corresponding to the air volume W calculated in step 112.

Steps 102 to 114 described above are determined by the operating clock frequency of the computer 10a, and are normally executed repeatedly at a sufficiently fast cycle.
If the stop switch in the switch panel 11 is turned on or the ignition switch 13 is opened during this execution, all the processes shown in FIG. Return to previous state.

In addition, the control of the internal and external air damper 2, the electromagnetic clutch 3
1 and the solenoid valve 32 are not related to the gist of the present invention, so the explanation will be omitted.

Although the above embodiment uses a digital computer, it can also be replaced with an analog circuit.

An example is shown in FIG. 40 is a well-known control circuit composed of an operational amplifier and the like, and its input resistances include a temperature setting variable resistor 41, an internal temperature sensor 42,
An outside temperature sensor 43 and a feedback potentiometer 44 are connected in series. A known control circuit 40 has a temperature setting resistor 41 and another resistor 42.
The actuating unit 4 sends a signal according to the difference from the combined resistance of ~44
8, and the operating portion 48 operates an adjustment mechanism 51 that adjusts, for example, the opening degree of a temperature adjustment damper, thereby adjusting the temperature so that the above-mentioned difference disappears. In addition, 49 is a voltage adjustment circuit, and 50 is an operation switch, and when this switch is turned on, the blower motor 3, the operating section 48, etc. are operated.

Reference numeral 52 denotes an air outlet switching circuit, and two electromagnetic valves 46 and 47 forming the actuator 35 correspond to the output of the control circuit 40.
It is designed to operate and switch the outlet damper. Furthermore, the amount of solar radiation is detected by the solar radiation sensor 45 consisting of a photodiode, and the damper opening detected by the potentiometer 44a is below a certain value (the value at which the vent outlet temperature is 30°C or less at bi-level), and the solar radiation is detected by the solar radiation sensor 45. (e.g. solar radiation of 300 kcal/m ²
When a state of H or higher) is detected, the solenoid valves 46, 47
The circuit has a circuit configuration that commands and switches to bi-level mode.

Note that the present invention can also be implemented as a device that simply displays or notifies the occupant of a suitable blowout mode without automatically switching the blowout mode.

〔Effect of the invention〕

As described above, according to the present invention, when the heater mode blowout is selected, the bypass is activated only when the amount of solar radiation is above a predetermined level and the temperature of the air blown from the upper outlet is below the predetermined temperature. Since the airflow is in level mode, it is possible to maintain the feeling of heating in the lower half of the occupant's body while preventing excessive heat from being given to the upper half of the body, resulting in the excellent effect of providing a comfortable air-conditioned feeling to the occupant.

[Brief explanation of the drawing]

Figures 1 to 7 show an embodiment in which the present invention is applied to an air conditioner for an automobile. Figure 1 is an overall configuration diagram, Figure 2 is a block diagram of an electrical control system, and Figure 3 is an apparatus. FIG. 4 is a flowchart showing the processing of the digital computer 10a (FIG. 2) that integrates the operation of FIG. Blowout temperature for explanation of step 104 in FIG. 3
A characteristic diagram of TAO and blowout mode, Figure 6 shows the blowout temperature used to explain step 109 in Figure 3.
Characteristic diagram of TAO and damper opening As, Fig. 7 is the 3rd
Blowout temperature used to explain step 112 in the figure
A characteristic diagram of TAO, set temperature Ts, and air volume W, FIG. 8 is a wiring diagram of an electrical control system showing another embodiment of the present invention, and FIG. 9 is a block diagram showing a configuration diagram of the present invention. 1... Ventilation duct, 1c... Upper outlet (vent outlet), 1d... Lower outlet (heater outlet), 10... Control device, 25, 45... Solar radiation sensor, 52... Outlet switching circuit.

Claims (1)

[Claims] 1. Vent mode blowout that blows air from an upper outlet provided in the vehicle interior to the upper part of the vehicle interior, and air from a lower outlet provided below the upper outlet to the lower part of the vehicle interior. a selection means for outputting a selection signal for selecting either a heater mode blowout that performs air blowing or a bilevel mode blowout that uses air blowing from both the air outlets; mode switching means for switching modes among mode blowout, heater mode blowout, and bi-level mode blowout; response means responsive to the magnitude of solar radiation; and according to the selection result of the selection means and the response means, the selection means has selected heater mode airflow and the amount of solar radiation is at a predetermined level or higher, a correction means for outputting a correction signal for correcting the heater mode airflow to bi-level mode airflow among the selection results of the selection means; An air conditioning control device for a vehicle, comprising: a limiting means for limiting a correction signal of the correcting means, such as when determining that the temperature of the air blown out from the air outlet is equal to or higher than a predetermined temperature.