JPS6236883B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a car air conditioner control device that adjusts and controls the introduction ratio of indoor air and outside air to a car air conditioner.

Conventional devices of this type include, for example, Japanese Patent Application Laid-Open No.
No. 100746 ``Air conditioner for automobiles, etc.'' detects the temperature inside the vehicle and detects the temperature when the detected temperature exceeds the set temperature in order to promote ventilation in the vehicle interior while maintaining an appropriate temperature inside the vehicle during cooling. When this happens, the inside/outside air switching damper that switches between outside air introduction and inside air circulation is controlled to switch to the outside air introduction state, and after this outside air introduction state is maintained for a predetermined time by a timer, the inside air circulation state is returned to. Further, the above-mentioned predetermined time is changed in conjunction with the operation of the air flow rate adjustment switch.

However, in this device, the internal/external air switching damper is frequently switched, and the temperature of the air blown into the vehicle interior fluctuates each time the damper is switched.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to improve the air conditioning capacity when a car air conditioner starts operating and when the air conditioning capacity is insufficient, and to perform stable air conditioning control with small fluctuations in the temperature of the blown air. .

In order to achieve this object, the present invention includes: a first cooler device that cools a first specific location in the vehicle interior; a first switch that operates the first cooler device; and a first switch that operates the first cooler device. a second cooler device that primarily cools a second specific location different from the first specific location in the vehicle interior; a second operating switch that operates the second cooler device; an air introduction ratio adjustment device that is provided in at least one of the air passages of the second cooler device and that adjusts the introduction ratio between the air circulating inside the vehicle interior and the air outside the vehicle interior; and an air introduction ratio adjustment device that sets a desired temperature in the vehicle interior. a setting device; a room temperature sensor that detects the temperature inside the vehicle; and when the first operating switch is in an on state, a desired temperature set by the setting device and a temperature inside the vehicle detected by the room temperature sensor. determines that the temperature deviation between At the same time, a technical means is adopted, comprising: a calculation device that outputs a second command signal for operating the second cooler device regardless of the operating state of the second operating switch.

The embodiments of the present invention shown in the drawings will be described above. FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, in which the air conditioner is controlled using an on-vehicle microcomputer that executes digital arithmetic processing using software according to a predetermined air conditioner control program.

In FIG. 1, reference numeral 1 denotes an air duct of a car air conditioner installed in a car, which introduces air from outside the car through an outside air intake port 1a, and takes in and circulates air inside the car from an inside air intake port 1b. Reference numeral 2 denotes an inside/outside air switching damper which selectively opens the outside air intake port 1a and the inside air intake port 1b to switch between outside air introduction and inside air circulation. Although not shown, the air duct 1 includes a blower for blowing air, an evaporator for cooling the air, a heater core for heating the air, and an air blower for adjusting the rate of heating and cooling. It is equipped with a mixture damper, etc., and controls the air conditioning inside the vehicle compartment 3 by adjusting the temperature by mixing cold air and warm air.

Reference numeral 4 denotes an air pill filter, which purifies the air inside the vehicle interior 3. Reference numeral 5 denotes a rear cooler, which is disposed at the rear of the vehicle compartment 3 and cools the air inside the vehicle compartment 3 from the rear by distributing and introducing the refrigerant from the main cooler disposed at the front of the vehicle. It has a built-in evaporator. 6 is an opening sensor that detects the opening degree of the inside/outside air switching damper 2 and generates an opening signal; 7 is a room temperature sensor that detects the temperature inside the passenger compartment 3 and generates a room temperature signal; 8 is a sensor that detects the desired temperature. 9 is a rear cooler switch for manually controlling the operating command for the rear cooler 5; and 10 is an air pill switch for manually operating the operating command for the air cylinder 4.

11 is an A/D converter that converts an analog signal into a digital signal, which sequentially converts the opening signal from the opening sensor 6, the room temperature signal from the room temperature sensor 7, and the setting signal from the setting device 8 into digital signals. It is.

12 is a single-chip microcomputer that executes software arithmetic processing according to a predetermined air conditioner control program, and constitutes arithmetic processing means, to which a several megahertz (MHz) crystal resonator 13 is connected, It is activated by receiving a stabilized voltage from a stabilized power supply circuit (not shown) which generates a stabilized voltage of 5 volts (V) by receiving power from an on-vehicle battery. And, this microcomputer 12 is
Read-only memory that stores the air conditioner control program that defines the calculation procedure for each step.
Only Memory; ROM) and a central processing unit (Central Processing Unit) that sequentially reads out the air conditioner control program in this ROM and executes the corresponding arithmetic processing.
A Processing Unit (CPU), a memory (Random Access Memory (RAM)) that temporarily stores various data related to the arithmetic processing of this CPU and can read the data by the CPU, and a crystal oscillator 13, It is a one-chip large-scale integrated circuit (LSI) device whose main parts are a clock generator that generates reference clock pulses for calculations, and an input/output (I/O) circuit that adjusts the input and output of various signals. It is something.

Through the arithmetic processing of the microcomputer 12, each detection signal from the opening sensor 6 and the room temperature sensor 7, and the setting signal from the setting device 8 are sequentially converted into digital signals by the A/D converter 11, and the rear cooler switch. 9. Input each switch signal from the air pill switch 10, process various calculations and judgments, and generate a command signal to determine the opening degree of the internal/external air switching damper 2 and actuate the air pill switch 4 and rear cooler 5. Generates control command signals.

14 is a damper drive circuit which receives and latches an opening command signal from the microcomputer 12, amplifies the signal to generate an opening drive signal and a closing drive signal, and applies the drive signal to the opening adjustment actuator 1.
In addition to 5. This opening adjustment actuator 15
adjusts the opening degree of the inside/outside air switching damper 2 according to each drive signal. 16 is the air piping drive circuit,
It receives and latches an operation command signal from the microcomputer 12, amplifies the signal, and applies an air pill drive signal to the air pill lifter 4 and the air pill indicator 17 to drive the air pill lighter 4 and during its operation. Air piping indicator 1
It is displayed on 7. 18 is a rear cooler drive circuit which receives and latches an operation command signal from the microcomputer 12, amplifies the signal and generates a rear cooler drive signal, and drives the rear cooler 5 with this rear cooler drive signal. The rear cooler display 19 indicates that it is in operation.

Next, the operation of the above configuration will be explained with reference to the calculation flowchart in FIG. This figure 2 shows the microcomputer 1 using the air conditioner control program.
2 is a calculation flowchart showing calculation processing of No. 2;

First, the arithmetic processing of this microcomputer 12 will be explained. Now, in a car equipped with this device, when the vehicle starts driving, the microcomputer 12 is activated by receiving a stabilized voltage through the stabilized power supply circuit, and the microcomputer 12 is activated for several milliseconds at a period of about tens of milliseconds (msec). Execute the calculation processing of the air conditioner control program.

That is, when the arithmetic processing of the microcomputer 12 reaches the air conditioner control program, the second
The calculation process starts from cooler mode determination step 101 in the figure. In the cooler mode determination step 101, it is determined whether the car air conditioner is in cooler mode or not. If the answer is YES, the process proceeds to blower determination step 102. In this blower determination step 102, it is determined whether or not the blower that adjusts the air flow rate of the car cooler is operating (ON). When the blower is OFF (non-operating), the determination is NO, but on the other hand, when the blower is ON, the determination is NO. When the determination becomes YES, the process advances to signal input step 103. In this signal input step 103, the room temperature sensor 7 outputs digital room temperature data indicating the room temperature T through the A/D converter 11, and the setter 8 inputs digital temperature data indicating the set temperature Tc through the A/D converter 11. The data is input sequentially and stored in the RAM, and the process proceeds to deviation calculation step 104, where the deviation △T of the room temperature T from the set temperature Tc is calculated as △T=T-Tc.
The calculation is performed using the following formula, and the process proceeds to the next rear cooler switch determination step 105. In this rear cooler switch judgment step 105, it is judged whether or not the rear cooler switch 9 is turned on, and when it is turned on (on), the judgment becomes YES, but when it is turned off, the judgment becomes NO, and the first deviation judgment is made. Proceed to step 106. This first deviation determination step 106
Then, it is judged whether the deviation △T increases and exceeds the first set value Ts ₁ using the relational expression △T>Ts _1. When the judgment becomes YES, the process proceeds to rear cooler on step 107 and the rear cooler is turned on. A rear cooler set signal for operating the rear cooler 5 is applied to the rear cooler drive circuit 18, and when the judgment in the first deviation judgment step 106 becomes NO, the process proceeds to a rear cooler off step 108, and a rear cooler set signal is applied to the rear cooler drive circuit 18 for operating the rear cooler 5. The cooler reset signal is applied to the rear cooler drive circuit 18, and then the internal air mode determination step 1 is performed.
Proceed to 09.

In this inside air mode determination step 109, it is determined whether the inside/outside air switching damper 2 is in the inside air mode indicating the inside air circulation state, and when this determination becomes NO, the process proceeds to opening degree calculation step 110, and the deviation △
An opening degree target value D for controlling the opening degree of the inside/outside air switching damper 2 is determined corresponding to T. At this time, until the deviation △T reaches the second set value Ts ₂ , the value D is 0, which indicates the outside air introduction state, and between the first set value Ts ₂ and the third set value Ts ₃ , D = 0. The opening target value becomes proportional in the range from the minimum value of D = Dm to the maximum value indicating the internal air circulation state, and when the third set value Ts ₃ is exceeded, the value of D = Dm indicating the internal air circulation state become. On the other hand, the shyness mode determination step 10
When the judgment in step 9 becomes YES, proceed to setting step 11.
1 and set the target opening value D to indicate the internal air circulation state.
= Set to Dm. After obtaining these opening degree target values D, the process proceeds to a damper control step 112, in which digital opening data is obtained through the A/D converter 11 from the opening sensor 6 that detects the opening degree of the internal/external air switching damper 2. Input the opening degree calculation step 110
Alternatively, a comparison is made with the opening target value D obtained in the setting step 111, an opening command signal is generated, the opening of the internal/external air switching damper 2 is controlled to the opening target value D, and the next air Pill switch judgment step 1
Proceed to step 13.

In this air pill switch judgment step 113, it is judged whether or not the air pill switch 10 is turned on, and when it is turned on (on), the judgment is YES.
However, when the other side is off, the determination becomes NO and the process proceeds to the second deviation determination step 114. In this second deviation judgment step 114, it is judged whether the deviation △T increases and exceeds the third set value Ts ₃ using the relational expression △T>Ts ₃ , and when the judgment becomes YES, the air The process advances to step 115 to apply an air pill reset signal to the air pill drive circuit 16 to operate the air pill lifter 4, and when the judgment in the second deviation judgment step 114 becomes NO, the process proceeds to air pill off step 116. An air pill reset signal is applied to the air pill drive circuit 16 to proceed and stop the operation of the air pill lifter 4. The above calculation process performs one calculation, and subsequent calculation processes of other control systems include temperature control of the car air conditioner, ventilation control, and compressor operation control.

Next, the overall operation in various states will be explained.

First, when the car cooler is in cooler mode, a stabilized power supply circuit (not shown) starts operating by turning on the key switch of the car, and the stabilized voltage is applied to the microcomputer 1.
The microcomputer 12 is put into operation by being supplied to each circuit including the microcomputer 2. Upon this start of operation, the microcomputer 12 initializes the states of its registers, counters, latches, etc., and then reaches the cooler mode determination step 101 from the instep of the air conditioner control program in FIG. 2 and starts its arithmetic processing. At this time, since the car air conditioner is in the cooler mode, the determination in the cooler mode determination step 101 becomes YES, and the process advances to the blower determination step 102. And cabin 3
When the blower motor that adjusts the amount of air blown inward is off, the determination in the blower determination step 102 becomes NO, and the program proceeds to the out step without proceeding to the signal input step 103, and one calculation is completed.
Thereafter, until the blower motor is turned on, the calculations from the in-step to the cooler mode determination step 101, the blower determination step 102, and the out-step are repeated in the air conditioner control program shown in FIG.

During this repeated calculation, if the rear cooler switch 9 and the air pump switch 10 are in the off state and the internal air mode is set, the blower motor is turned on based on manual operation by the passenger or calculation processing for airflow control. Then, blower determination step 102
When the temperature is reached, the judgment is reversed from NO to YES, and the process proceeds to signal input step 103, where room temperature data T and set temperature data Tc are input and stored from room temperature sensor 7 and setting device 8 through A/D converter 11, and the deviation is calculated. Proceed to calculation step 104 and calculate the set temperature Tc.
The deviation ΔT of the room temperature T with respect to the temperature is calculated using the formula ΔT=T−Tc and stored, and the process proceeds to the rear cooler switch determination step 105. At this time, since the rear cooler switch 9 is in the OFF state, the determination at the rear cooler switch determination step 105 becomes NO, and the process proceeds to the first deviation determination step 106, where the deviation △
It is determined whether T is larger than the first set value Ts ₁ , but since the room temperature is high at the start of operation and the deviation ΔT becomes a large value, the determination in the first deviation determination step 106 is not successful.
YES, rear cooler switch step 10
7, a rear cooler set signal is applied to the rear cooler drive circuit 18. As a result, the set signal is held in the rear cooler drive circuit 18 to operate the rear cooler 5, and the rear cooler display 19
indicates that rear cooler 5 is operating. At the same time, the arithmetic processing of the microcomputer 12 proceeds to the next internal air mode determination step 109, but since the internal air mode is set at the start of operation, the determination at this internal air mode determination step 109 becomes YES.
Do not proceed to opening degree calculation step 110 and proceed to setting step 1.
Step 11 sets the opening target value D to the maximum value indicating the inside air circulation state of D=Dm, and the process goes to damper opening control step 112, where the internal/external air switching damper 2 is held at the position of the inside air circulation state, and the air pipe is The process advances to the Uri switch determination step 113. At this time, since the air pill switch 10 is in the OFF state, the judgment in the air pill switch judgment step 113 becomes NO, and the process proceeds to the second deviation judgment step 114, where the deviation △
It is determined whether T is larger than the third set value _Ts3 , but the deviation △T has become a large value at the start of operation, and the judgment in the second deviation judgment step 114 is YES.
Then, proceed to air pillion step 115 and send the air pill reset signal to the air pill drive circuit 16.
Add to. As a result, the air pill drive circuit 16 holds the set signal and operates the air pill lifter 4, and the air pill indicator 1
7 indicates that the air pilli- fier 4 is in operation. At the same time, the arithmetic processing of the microcomputer 12 reaches an outstep, and one operation by the air conditioner control program shown in FIG. 2 is completed. Thereafter, for a while, at intervals of several tens of milliseconds, from the instep to cooler mode determination step 101, blower determination step 102, signal input step 103, deviation calculation step 104, rear cooler switch determination step 105, first deviation determination step 106, Rear cooler on step 10
7. Inside air mode determination step 109, setting step 111, damper opening degree control step 112, air pump switch determination step 113, second deviation determination step 114, air pillion step 11
The same operations as above are repeated through 5 to the outstep. At this time, the cooling operation by the main cooler is also progressing at the same time due to other calculation processing.

In addition to the cooling provided by the main cooler, additional cooling provided by the rear cooler 5 and air purification provided by the air pillier 4 protect the internal air circulation and lower the temperature inside the vehicle interior 3. Then, the room temperature sensor 7 corresponds to the set temperature Tc set in the setting device 8.
When the deviation ΔT of the room temperature T detected at becomes smaller and reaches the third set value _Ts3 , when the second deviation judgment step 114 in the above-mentioned iterative calculation is reached, the judgment is reversed from YES to NO. Instead of proceeding to air pillion step 115, the process proceeds to air pill off step 116, where the air pill reset signal is applied to the air pill drive circuit 16, the held set signal is reset, and the air pill lifter 4 is turned off. At the same time, the display on the air piping display 17 is reset. Along with this, microcomputer 1
The arithmetic process No. 2 reaches the outstep and completes one arithmetic operation, and the same arithmetic process is repeated thereafter.

Then, after 1 to 3 minutes have passed in the inside air mode, the temperature inside the vehicle compartment 3 has further decreased, and when the deviation △T of the room temperature T from the set temperature Tc reaches the first set value Ts ₁ , the above steps are repeated. Calculation is the first deviation judgment step 1
06, the determination is reversed from YES to NO, and the process proceeds to the rear cooler off step 108, where the rear cooler reset signal is sent to the rear cooler drive circuit 18.
In addition, the set signal held since the key switch was turned on is reset, the rear cooler 5 is turned off, and the display on the rear cooler display 19 is reset. Along with this, the microcomputer 12
The arithmetic processing is performed in the internal air mode determination step 109, the setting step 111, and the damper opening degree control step 11.
2. After passing through the air-pillar switch judgment step 113, the second deviation judgment step 114, and the air-pillar off step 116, the out step is reached and one calculation is completed, and the same calculation is repeated thereafter.

By completing this initial cooling at the start of operation, the internal air mode is switched to the external air mode. As a result, when the calculation of the air conditioner control program shown in FIG. 2 reaches the inside air mode determination step 109, the determination is reversed from YES to NO, and the process proceeds to the opening degree calculation step 110. At this time, since the initial cooling is finished, the room temperature T relative to the set temperature Tc
Since the deviation △T is smaller than the first set value Ts ₁ , the opening target value is D indicating the outside air introduction state.
= 0, the process proceeds to damper opening control step 112, where the control signal is applied to the damper drive circuit 14, and the opening adjustment actuator 15 sets the inside/outside air switching damper 2 to the outside air introduction state at the position shown by the solid line in FIG. Adjust the air pump switch to determine step 11.
3. Repeat the calculations through the second deviation determination step 114 and the air pump off step 116 to reach the out step.

After that, it becomes stable and the deviation △T becomes the first set value.
The cooling capacity of the main cooler is controlled to be stable within a range smaller than Ts ₁ , and the room temperature T is adjusted to the set temperature Tc.
The temperature is maintained at a temperature approximately equal to the temperature.

During this stable control, if the temperature of the passenger compartment 3 rises higher than the set temperature Tc due to a decrease in cooling capacity or a large thermal disturbance such as under the scorching sun, the deviation of the room temperature T from the set temperature Tc gradually becomes a larger value. This makes the deviation △T the first
When the set value Ts becomes larger than ₁ , when the first deviation determination step 106 in the calculation of the air conditioner control program in FIG. 2 is reached, the determination will be from NO to NO.
Flip to YES and rear cooler off step 108
Instead of proceeding to the rear cooler on step 107, the rear cooler set signal is sent to the rear cooler drive circuit 1.
8, the rear cooler 5 is controlled to be on to increase the cooling capacity, and the rear cooler display 19 indicates that it is in operation. At the same time, the calculations by the microcomputer 12 include an internal air mode determination step 109, an opening calculation step 110, a damper opening control step 112, an air pump switch determination step 113, a second deviation determination step 114, and an air pump off step 116. Pass through and reach Outstep. By repeating this series of calculations, the air pillow firer 4 is kept in the off state, the inside/outside air switching damper 2 is kept in the outside air introduction state, and the rear cooler 5 is controlled in the on state to bring the rising room temperature to the set temperature. I'm trying to lower it.

Regardless of this correction control of the cooling capacity, the temperature of the passenger compartment 3 further increases, and as a result, the deviation △T increases and exceeds the second set value _Ts2 . D becomes a large value in proportion to the magnitude of the deviation ΔT from D=0. Therefore, in the calculation in the damper opening degree control step 112, the opening degree of the inside/outside air switching damper 2 gradually increases toward the inside air circulation position. Therefore, the amount of outside air that is higher than room temperature gradually decreases, and the
Thermal disturbances to the air conditioner are reduced, and the cooling capacity is relatively corrected in the direction of increase. And the deviation △
When T becomes larger than the third set value Ts ₃ ,
Through the calculations in the opening degree calculation step 110 and the damper opening degree control step 112, the inside/outside air switching damper 2 is controlled to the inside air circulation state shown by the broken line in FIG. 1 to increase the cooling capacity, and the second deviation determination step 1
14 is reversed from NO to YES, the process proceeds to air pillion step 115, where an air pill reset signal is applied to the air pill drive circuit 16, and the air pill filter 4 is controlled to be in the ON state to remove the circulating inside air. It is cleaned and the air piping indicator 17 indicates that it is in operation. As a result, the temperature inside the vehicle compartment 3 is lowered toward the set temperature.

On the other hand, when the occupant manually turns on the rear cooler switch 9, when the calculation of the microcomputer 12 reaches the rear cooler switch determination step 105 in FIG. 2, the determination changes from NO to NO.
The result is reversed to YES, and regardless of the magnitude of the deviation ΔT, the process proceeds to the rear cooler on step 107, where a rear cooler set signal is applied to the rear cooler drive circuit 18, and the rear cooler 5 is activated.

Further, when the passenger manually turns on the air pump switch 10, when the calculation of the microcomputer 12 reaches the air pump switch judgment step 113 in FIG. 2, the judgment is reversed from NO to YES, and the deviation Regardless of the magnitude of ΔT, the process proceeds to air pillion step 115, applies an air pill reset signal to the air pill drive circuit 16, and
Activate air pill lifter 4.

In addition, in the above-mentioned embodiment, the inside/outside air switching damper is controlled only by the magnitude of the deviation ΔT of the room temperature T with respect to the set temperature Tc, but the deviation ΔT
In addition to this determination, whether or not there is sufficient capacity for cooling or heating may be determined by determining the opening degree of the air mix damper.

Further, although a microcomputer that executes software arithmetic processing according to a predetermined control program is exemplified as the arithmetic processing means, a similar control may be performed using a hardware electronic circuit.

Further, although a setting device that generates an analog signal corresponding to the set temperature Tc has been shown as a setting device for determining the set temperature Tc, it may be set in a digital manner.

As described above, according to the present invention, even when a large cooling capacity is required, such as at the start of cooling or when there is a large heat load, the proportion of internal air circulation is increased, and all of the In order to operate the
The cooling capacity can be rapidly increased, resulting in the temperature inside the vehicle quickly approaching the desired temperature.
In addition, since frequent switching between the inside and outside air can be prevented, the excellent effect of stable air conditioning control with small fluctuations in the temperature of the blown air can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is a calculation flowchart showing the calculation processing of the microcomputer in FIG. DESCRIPTION OF SYMBOLS 1... Ventilation duct, 1a... Outside air intake, 1b... Inside air intake, 2... Inside/outside air switching damper forming an adjustment device, 3... Vehicle interior, 7... Room temperature sensor, 8... Setting device, 1
2...A microcomputer serving as an arithmetic processing unit,
14, 15... Damper drive circuit and opening adjustment actuator for driving the drive device.

Claims (1)

[Scope of Claims] 1. A first cooler device that intensively cools a first specific location in the vehicle interior, a first switch that operates the first cooler device, and the first cooler device in the vehicle interior. a second cooler device that intensively cools a second specific location different from the specific location; a second operating switch that operates the second cooler device; and a second operating switch that operates the second cooler device; an air introduction ratio adjustment device that is provided in at least one of the air passages and that adjusts the introduction ratio between the air circulating in the vehicle interior and the air outside the vehicle; a setting device that sets a desired temperature in the vehicle interior; a room temperature sensor that detects a temperature of outputting a first command signal to the air introduction ratio adjustment device to increase the circulation amount of the air inside the vehicle compared to the amount of air introduced outside the vehicle; A car air conditioner control device comprising: a calculation device that outputs a second command signal for operating the second cooler device regardless of the operating state of the operating switch.