JPH01282009A - Air conditioner for automobiles - Google Patents

Abstract

PURPOSE:To solve complicated handling to finely adjust air condition and to easily attain desirable air condition depending on each person's taste by making possible to set an aimed temperature automatically corresponding to an outer temperature and at the same time, making the set characteristic selective by a plurality of selection switches. CONSTITUTION:The quantity of heat to be supplied to car room is adjusted by a heat load adjusting means 100, and by a controlling means 110, at least the operation of the heat load adjusting means 100 is controlled depending on an aimed set temperature and the temperature in the car room and the car room is kept at the aimed set temperature. A controlling state of the air condition is selected by a plurality of selection switches 25 in this air conditioner. The aimed set temperature is determined by an aimed set temperature determining means 120 based on the each selection switch 25 and the outer temperature. After that, air conditioning is carried out based on the determined aimed set temperature and the temperature in the car room. Complicated handling to finely adjust air condition is thus resolved and desirable air condition corresponding to each person's taste is obtained easily.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an air conditioner for an automobile, particularly one having an automatic air conditioning function.

(Prior art) Conventionally, as this type of device, for example,
As shown in Publication No. 8012, it has a temperature setting device, calculates a comprehensive signal from the set value of this setting device, the vehicle interior temperature, and the outside air temperature, and controls the blower and air mix door based on this comprehensive signal. 2. Description of the Related Art Automotive air conditioners, so-called auto air conditioners, which maintain the temperature inside a vehicle at a temperature set by a setting device are well known.

In such automobile air conditioners, even if the set temperature is set to, for example, 25 degrees Celsius, which is the optimum temperature for humans, the air conditioning feeling for the occupants will vary depending on the outside temperature, solar radiation conditions, etc., so it may not always be comfortable. However, it is necessary to make fine adjustments to the temperature setting device depending on the environmental conditions at the time.

(Problem to be Solved by the Invention) However, in the above conventional example, even if an attempt is made to optimize the air conditioning feeling by finely adjusting the temperature setting device, how much the setting device must be operated to obtain the optimal air conditioning feeling. Since it is not clear whether the vehicle will be adjusted or not, it is difficult to make fine adjustments as described above, and the operation is troublesome for the passengers.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an air conditioning system for automobiles that solves the above-mentioned problems of the prior art and allows the temperature to be set according to each individual's preference without impairing the air conditioning feeling of the occupants. .

(Means for Solving the Problems) As shown in FIG. An air conditioning system for an automobile comprising a control means 110 for controlling the operation of the heat load adjusting means 100 based on the temperature and the temperature inside the vehicle, and maintaining the temperature inside the vehicle at the target set temperature. Multiple selection switches 25 for selecting states
and a target temperature determining means 120 for determining the target temperature based on the settings of the plurality of selection switches 25 and the outside air temperature.

(Function) Therefore, the target set temperature is determined by the target set temperature determining means according to the outside air temperature in addition to the setting of the selection switch by the occupant, and air conditioning is performed based on this determined value and the cabin temperature. This eliminates the trouble of adjusting the temperature setting device as in the past, and the pattern for determining the target set temperature can be changed in various ways using the selection switch.Therefore, the above problems can be achieved. be.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

2 and 3, an embodiment of the present invention is shown, and an automotive air conditioner has an air conditioning duct 1, the most upstream side of which is divided into two parts: an inside air inlet 2 and an outside air intake 3. An inside/outside air switching door 4 is provided at the separated part, and the air to be introduced into the air conditioning duct 1 is selected between inside air and outside air by this door 1-74.

The blower 5 sucks air into the air conditioning duct 1 and sends the air to an evaporator 6 and a heater core 7 provided on the downstream side.

The evaporator 6 is connected to a cooling cycle (not shown) and cools the air passing through the evaporator 6.

Further, the heater core 7 is inserted into a hot water cycle in which engine cooling water (not shown) circulates, and heats the passing air. A bypass passage 9 is formed, and the air that has passed through this bypass passage 9 or the above-mentioned heating passage 8 joins on the downstream side of each and is blown into the vehicle interior from an outlet (not shown).

Furthermore, an air mix door 10 is provided on the upstream side of the heater core 7.
is provided so that the ratio of the air passing through the heating passage 8 and the air passing through the bypass passage 9 can be adjusted according to their positions, and is rotated by an actuator 11.

12 is a microcomputer, a central processing unit CPU;
Read-only memory ROM, random access memory RA
This microcomputer 1 is equipped with M, input/output ports ■/○, etc.=4-, which is known per se.
2 receives signals from various sensors, etc., which will be described later, through a multiplexer 13 that selects and outputs a desired signal from various input signals, and an A/D converter 14 that converts the analog output signal of this multiplexer 13 into a digital signal. is input.

That is, the multiplexer 13 includes an opening sensor 15 that detects the position of the air mix door 10 described above, a passenger compartment temperature sensor 16 that detects the temperature Tr in the passenger compartment, an outside air temperature sensor 17 that detects the outside air temperature, and an amount of solar radiation. solar radiation sensor 1
8 are connected to each other.

Further, the microcomputer 12 is configured to receive an output signal from an operating section 19 having functions for setting a target temperature setting state, a blowing mode, and the like. The microcomputer 12 calculates control signals for the blower 5 and air mix door 10 based on the above-mentioned various input signals, and operates the blower 5 and air mix door 10 by outputting control signals to the drive circuits 20a and 20b. control.

FIG. 3 shows an example of the panel arrangement of the aforementioned operation section 19, where the panel 21 is divided into upper and lower sections, and a mode switch for setting the blowout mode is provided on the left side of the center of the upper section. That is, 22a is a vent mode switch that sets Ben 1 mode, 22b is a pie level mode switch that sets pie level mode, 22c is a foot mode switch that sets foot mode, and 22d is a defrost/foot mode switch that sets defrost and foot mode. A foot mode switch 22e is a defrost mode switch for setting a defrost mode.

An air conditioner switch 23 for turning on and off a compressor (not shown) is provided near the right end of the upper stage of the panel 21 where the mode switches 22a to 22e described above are provided. Furthermore, a control switch 24 for the blower 5 is provided between the air conditioner switch 23 and the mode switches 22a to 22e described above. This control switch 24 has the function of switching between automatic air volume setting (rAUTOJ position) and manual setting, and air volume switching function during manual setting (rlJ position).
.

r2", r3") function.

In addition, a software selection switch 25 is provided on the lower panel 21 where the mode switches 22a to 22e described above are provided.
There are three selection switches: c, normal selection switch 25a, and hard selection switch 25b. These selection switches 25a to 25c are used to change the setting pattern of the target set temperature with respect to the outside air temperature, and the details thereof will be described later.

Panel 21 corresponding to the lower side of the control switch 24 described above
An indicator 27 configured by arranging a plurality of LEDs 26 is provided at the location. This display 27 displays the air conditioning condition inside the car. If the automatically set target temperature matches the car interior temperature, only the center LED 26a lights up, and the temperature inside the car is cooler than the target temperature. (
GOOL) or HOT (HOT) side,
The number of LEDs 26 corresponding to the shifted temperature is at the center L.
The light is turned on to the cool display side or hot display side of the panel 21 including the ED 26a.

An inside air setting switch 28 for setting the inside/outside air switching door 4 to the inside air circulation position is provided on the surface of the panel 21 below the air conditioner switch 23, and when this switch 28 is not pressed, is the inside/outside air switching door 4
is set to the outside air introduction position.

FIG. 4 shows an example of air conditioning control in the above-mentioned microcomputer 12 as a main flowchart.

That is, the microcomputer 12 starts executing the program from step 200 by turning on a start switch (not shown), and proceeds to the next step 2028, where various variables are initialized. Then, the process advances to the next step 210.

In step 210, a control signal is output to the multiplexer 13, the detection signals of the various sensors 15 to 18 described above are input, and the setting data of the operation section 19 described above is input, and the process proceeds to the first step 2208.

In step 220, among the data input in step 210 described above, the setting data of the three selection switches 25a to 25c of the operation unit 19 and the outside air temperature Ta are input, and the target set temperature is determined based on these input data. However, the details will be described later. This step 22
After completing the process at step 0, the process proceeds to step 240.

At step 240, a total signal T is calculated using the following equation based on the input vehicle interior temperature Tr, outside air temperature Ta, solar radiation Ts, and the eye Ill set temperature Td determined at step 206 described above.

T = (T r -25) + to 1 (T a -25) + to 2 (Ts - 12) + Ks Ts - to 4 (T d 2
5 F...Equation (1) However, 3 in K1- is a calculation coefficient.

After completing this calculation, the process proceeds to step 260.

In step 260, a predetermined arithmetic expression or a predetermined R
The opening degree of the air mix door 10 is determined based on the OM control pattern, the actuator 11 is driven via the drive circuit 20a, the air mix door 10 is set at a predetermined position, and the process then proceeds to step 280.

In step 280, the rotation speed of the blower 5 is determined based on the total signal T in the same manner as in step 260 described above, and the blower 5 is driven by the drive circuit 20b at this rotation speed, and the process returns to step 210 described above. Then, the above control is repeated again.

In FIG. 5, a specific example of the target temperature calculation in step 220 described above is shown in a flowchart, and the contents thereof will be explained below with reference to the same figure.

The microcomputer 12 starts executing this arithmetic routine at step 220, and proceeds to step 222 to determine which of the selection switches 25a to 25c is selected. If it is determined that the normal selection switch 25a is selected, the process proceeds to step 224; if it is determined that the hard selection switch 25b is selected, the process proceeds to step 226; the software selection switch 25c is selected. If it is determined that this is the case, the process proceeds to step 228.

First, in step 224, the normal selection switch 25a is
Based on this selection, the target set temperature is determined so that the target set temperature has the relationship shown by the solid line in FIG. 6 with respect to the outside air temperature. That is, the target set temperature increases as the outside temperature decreases when the outside air temperature is less than a predetermined outside air temperature t3, and is fixed at a predetermined value when the outside air temperature exceeds the outside air temperature t3.

Incidentally, the target set temperature may be determined by calculating the above-mentioned arithmetic equation representing the solid line, or by storing the above-mentioned characteristic curve in a ROM and reading it out.

In step 226, based on the selection of the heart selection switch 25b, the target setting is performed in the same manner as in step 224 described above so that the target temperature has the relationship shown by the dotted chain line in FIG. 6 with respect to the outside air temperature. Temperature is set.

Here, the relationship between the target set temperature and the outside air temperature is that when the outside air temperature is less than 0°C, the target set temperature is constant at a predetermined value, = 11 - When the outside air temperature is above 0°C and below t3°C, the target set temperature is an increase in outside air temperature. It changes in inverse proportion to , and becomes constant again at a predetermined value (however, a value different from the above-mentioned predetermined value) when the outside air temperature is t3° C. or higher.

Further, in step 228, the software selection switch 25c
Based on the selection of , the target set temperature is determined in the same manner as in step 224 described above so that it becomes the characteristic curve shown by the dotted line in FIG. That is, the target set temperature is fixed at a predetermined value when the outside air temperature is less than 0°C, decreases in inverse proportion to the increase in outside air temperature when it is 0°C or more and less than t2°C, and is fixed at a predetermined value when it is above t2°C. It is something.

In addition, when the above-mentioned normal selection switch 25a is selected, when the hard selection switch 25b is selected, and when the soft selection switch 25 is selected,
The characteristic curves of the target set temperature with respect to the outside air temperature change when c is selected intersect at t1°C (for example, 25°C), and the target set temperatures match.

After the processing of steps 226, 224, and 228 described above is completed, the process returns to the main routine via step 230.

In the above configuration, the operation of this device will be described below. First, the device starts to start by turning on a starting switch (not shown). At this time, the control switch 24
The state is set to “O”.

When the normal selection switch 25a is selected, the target set temperature is determined according to the outside air temperature at this time along the characteristic curve represented by the solid line in FIG.
(see 4).

Furthermore, the air mix door 10 and the blower 5 are driven based on the comprehensive signal T calculated in the microcomputer 12 based on the determined set temperature, vehicle interior temperature, outside air temperature, etc. (steps 240 and 260). .280
). At the same time, the difference between the target set temperature and the vehicle interior temperature is hot.
It is displayed on the display 27, including the direction on the cool side.

Next, when the hard selection switch 25b is selected, the target set temperature is determined so as to correspond to the characteristic curve of the dashed line in FIG. 6 with respect to the outside air temperature (see step 226), and the vehicle interior temperature is The air mix door 10 and the like are driven in the same manner as described above so that the target set temperature is achieved. That is, when this hard selection switch 25b is selected, the target set temperature is set to a higher value than when the normal selection switch 25a is selected when the outside air temperature is less than t1°C for the same outside air temperature, and the outside air temperature If the temperature is higher than t1°C, the value will be set to a lower value than when the normal selection switch 25a is selected.

Therefore, when the outside air temperature is less than t1°C, the temperature inside the vehicle becomes warmer when the hard selection switch 25b is selected than when the normal selection switch 25a is selected; becomes cooler.

Finally, when the soft selection switch 25c is selected, the target set temperature is determined to be a characteristic curve indicated by the dotted line in FIG. 6 with respect to the outside air temperature (see step 228). That is,
The target set temperature is lower than when the normal selection switch 25a is selected when the outside air temperature is less than t1°C.
If the temperature is above ℃, the temperature will be set higher.

Therefore, when the outside temperature is less than t1°C, the inside of the vehicle becomes cooler than when the normal selection switch 25a is selected.
It becomes warm when the outside temperature is t□℃ or higher.

In addition, in this device, the target set temperature is set by selecting switch 2.
Settings 5a to 25c are completely automatically determined, but the operation unit 19 is provided with a fine adjustment circuit that allows fine adjustment of the automatically determined values by manual operation, and the display 27 The minute adjustment amount may be displayed on the screen.

In this case, when the selection of the selection switches 25a to 25c occurs, the fine adjustment amount up to that point is reset to zero, and at the same time, the display on the display 27 also changes to the center LED 26a.
It is preferable to only turn on the light.

(Effects of the Invention) As described above, according to the present invention, the target set temperature can be automatically set according to the outside temperature, and various setting characteristics of the automatic setting can be selected using a plurality of selection switches. This eliminates the hassle of fine-tuning the air conditioning feel with conventional temperature setting devices, and also makes it possible to adjust the air conditioning to suit the preferences of each passenger, contributing to the expansion of the range of users. be.

[Brief explanation of the drawing]

Fig. 1 is a functional block diagram of an automobile air conditioner according to the present invention, Fig. 2 is a configuration diagram showing an embodiment of the above automobile air conditioner, and Fig. 3 is an operation used in the above automobile air conditioner. FIG. 4 is a main flowchart showing an example of air conditioning control of the above automobile air conditioner; FIG. 5 is a subroutine flowchart showing control of target temperature calculation in the air conditioning control of the above automobile air conditioner; 6th
The figure is a characteristic diagram showing the relationship between the target setting temperature and the outside air temperature using the selection switch as a parameter. 25a...Normal selection switch, 25b...Hard selection switch, 25c...Soft selection switch, 1
00... Heat load adjustment means, 110... Control means, 1
20...Target temperature determination means. Patent applicant: Diesel Equipment Co., Ltd. Minna F
Cv co” MO bad

Claims (1)

[Scope of Claims] A heat load adjusting means for adjusting the amount of heat supplied to the vehicle interior; and a control means for controlling the operation of the heat load regulating means based on at least a target set temperature and a temperature in the vehicle interior;
In an automobile air conditioner that maintains the vehicle interior temperature at the target set temperature, a plurality of selection switches for selecting the air conditioning control state are provided, and the target temperature is determined based on the settings of the plurality of selection switches and the outside air temperature. An air conditioner for an automobile, characterized in that it includes target temperature setting means for determining a temperature setting.