JPS6222802B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a vehicle air conditioning control method and device that performs air conditioning correction for solar radiation into a vehicle interior. Conventionally, this type of device was
46972 "Blow volume control device for vehicle air conditioner"
The system compares and amplifies the signals from two thermistors that detect the temperature on the left and right sides of the vehicle, and uses this electrical signal to drive the air outlet changing grille device to adjust the air outlet direction. Therefore, two thermistors are required to detect the temperature difference between the left and right sides due to the influence of solar radiation, and multiple thermistors installed in each part of the vehicle interior are required to more accurately detect the balanced state of the influence of solar radiation. There is a problem that. The present invention has been developed in view of the above-mentioned problem, and it is made by confirming that solar radiation has an effect on the air conditioning inside the vehicle, and reading out the solar radiation direction for that time based on the relationship between the time and the solar radiation direction stored in advance. Detecting the traveling direction of the vehicle, determining the solar radiation direction into the vehicle interior from the solar radiation direction and the traveling direction at the time of the confirmation, and changing the air conditioning ratio to each part of the vehicle interior with respect to the solar radiation direction to perform air conditioning correction for the solar radiation. A vehicle air conditioning control method and a vehicle air conditioning control method capable of accurately determining the solar radiation direction and performing air conditioning correction for solar radiation without providing multiple sensors for detecting the temperature balance state in the vehicle interior due to the influence of solar radiation. It is an object of the present invention to provide an apparatus that can appropriately carry out the method. The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 is an overall configuration diagram showing one embodiment of the present invention, which uses an on-vehicle microcomputer that executes digital arithmetic processing using software according to a predetermined air conditioning control program. In FIG. 1, 1 is an air conditioner, which includes a blower motor 1a that blows air from an inside/outside air switching damper (not shown), and an evaporator 1b that cools and passes the air blown by the blower motor 1a.
, a heater core 1c that introduces engine cooling water and heats the blown air with its heat, and an air mix damper 1d that adjusts the temperature by adjusting the proportion of air passing through the evaporator 1b that is introduced into the heater core 1c side. It is composed of Reference numeral 2 denotes an air outlet switching damper that adjusts the ratio of air flow to the driver's seat 3 and the passenger's seat 4, and is fixed at the center position by a spring when no force is applied to this damper. Reference numeral 6 denotes an air outlet damper, which adjusts the ratio of the amount of air emitted to the left and right in the rear seat 5, and is fixed at the center position by a spring when no force is applied to this damper. 7 is a rear cooler device, which includes a blower motor 7a and an evaporator 7.
It is composed of b. 8 is the room temperature sensor,
It is installed near the instrument panel inside the vehicle to detect the temperature inside the vehicle and generate a room temperature signal. Reference numeral 9 denotes a temperature setting device that determines the set temperature of the control target, and is used by the occupant to manually determine the desired temperature. Reference numeral 10 denotes an infrared detector as solar radiation detection means, which is installed at the front of the bonnet of the vehicle and detects the amount of infrared rays emitted by sunlight or the like. Reference numeral 11 denotes an outside temperature sensor that detects the temperature of the air outside the vehicle and generates an outside temperature signal. 12 is an A/D that converts analog signals into digital signals.
The converter sequentially converts the room temperature signal from the room temperature sensor 8, the set temperature signal from the temperature setting device 9, the infrared signal from the infrared detector 10, and the outside temperature signal from the outside temperature sensor 11 into digital signals. .
Reference numeral 13 denotes a direction meter installed inside the vehicle, which detects the direction in which the vehicle is traveling by using the effect of the magnetic field caused by the earth's magnetism, and generates a 3-bit digital signal in response to the detected direction. That is, if the vehicle direction data A, which is the 3-bit digital signal, is expressed with respect to the direction, it becomes as shown in Table 1 below.

[Table] Reference numeral 14 denotes a digital clock as a timing device disposed in the vehicle interior, which generates digital signals representing the month, day, and hour. Reference numeral 15 denotes a microcomputer that executes digital calculation processing of software according to a predetermined air conditioning control program, and constitutes a calculation processing means.A several megahertz crystal oscillator 16 is connected to the microcomputer 15, and power is supplied from the on-board battery. 5 after receiving
It is activated by receiving a stabilized voltage from a stabilized power supply circuit (not shown) that generates a stabilized voltage of volts (V). This microcomputer 15 is a program for storing an air conditioning control program that defines calculation procedures.
A ROM 15a, a data ROM 15b as a storage section that stores various fixed data such as solar azimuth data as a solar radiation direction corresponding to the month, day, and hour and corrected air volume data according to the strength of solar radiation, and a data ROM 15b for the program. A CPU 15c that sequentially reads the air conditioning control program from the ROM 15a and executes the corresponding arithmetic processing, a memory RAM 15d that temporarily stores various data related to the arithmetic processing of the CPU 15c, and allows the CPU 15c to read the data; The main parts are a clock generating section 15e that generates reference clock pulses for the various calculations mentioned above with a child 16, and I/O circuit sections 15f ₁ and 15f ₂ that adjust the input/output of various signals. . By the calculation processing of this microcomputer 15, the blower motors 1a, 7
a command signal for rotational speed control, a switching command signal for the outlet switching dampers 2 and 6, and an air conditioner device 1;
Various command signals for temperature control are generated to the rear cooler device 7. Reference numerals 17 and 18 indicate motor drive circuits that respectively control the rotational speeds of the blower motors 1a and 7a, and a matching circuit that determines whether or not this circuit is designated in response to a designated signal from the microcomputer 15; A latch circuit that latches a digital command signal indicating the rotational speed from the microcomputer 15 when a match is detected by An oscillation circuit that generates a triangular wave signal, and a pulse train that compares the triangular wave signal from this oscillation circuit and the analog signal from the D/A converter to generate a pulse train with a constant frequency and a duty ratio proportional to the magnitude of the analog signal. It consists of a comparison circuit and an amplifier circuit that amplifies this pulse train, and controls the duty ratio of the current flowing through the blower motor. Reference numerals 19 and 20 designate switching actuators for switching and controlling the air outlet switching dampers 2 and 6, respectively, and a matching circuit that determines whether or not this actuator is designated in response to a designated signal from the microcomputer 15; A latch circuit that latches a digital signal from the microcomputer 15 indicative of air outlet switching when a match is detected by the microcomputer 15, a drive motor that switches and drives the air outlet damper, and the digital signal latched in the latch circuit are compared and determined to determine the drive. It is composed of a control circuit unit that applies current to the motor in the rotational direction, detects the magnitude of the applied current when the outlet damper contacts the switching limit point, and cuts off the applied current to the drive motor. It is something. Next, the operation of the above configuration will be explained with reference to the calculation flowcharts of FIGS. 2, 3, and 4. FIG. 2 is a calculation flowchart showing the overall calculation processing of the microcomputer 15 according to the air conditioning control program, FIG. 3 is a calculation flowchart showing the detailed calculation processing of the wind direction control calculation routine in FIG. 2, and FIG. 2 is a calculation flowchart showing detailed calculation processing of the air volume control calculation routine in FIG. 2. FIG. First, the arithmetic processing of this microcomputer 15 will be explained. Now, in a car equipped with this device, when the air conditioner switch (not shown) is turned on, the microcomputer 15 receives stable power from the stabilizing power supply circuit, which is supplied with power from the on-board battery via the ignition switch (not shown). The air conditioner enters the operating state upon receiving the voltage supply and executes the arithmetic processing of the air conditioning control program at a cycle of several hundred milliseconds (msec). That is, the arithmetic processing starts from the start step 100 in FIG.
Sets counters, latches, etc. to the initial states necessary to start arithmetic processing. To set this initial state, the hysteresis values T ₁ and T ₂ are T ₁ =0, T ₂
=0, and X=000 of the solar radiation direction data X. After this initial setting, the flow advances to a wind direction control calculation routine 300. In this wind direction control calculation routine 300, the calculation process starts from the data input step 301 shown in FIG.
It is input via the converter 12 and temporarily stored as the outside temperature Tam and the amount of infrared rays T. Then, the process proceeds to the next level calculation step 302, where the level judgment value α is calculated based on the function f that depends on the outside temperature Tam.
Calculate using the formula (Tam) + T ₁ . This function f is such that the higher the outside temperature Tam, the larger the level judgment value α becomes. Then, the process proceeds to the next infrared determination step 303, where it is determined whether the amount of infrared rays T is equal to or greater than the level determination value α. It becomes NO, but the amount of infrared rays T
is greater than or equal to the level judgment value α, that is, when the amount of solar radiation is large and has an effect on the temperature inside the vehicle, the judgment becomes YES and the process proceeds to hysteresis value setting step 304. In this hysteresis value setting step 304, a value for hysteresis for the judgment in the infrared judgment step 303 is set.
Set T ₁ to T ₁ = 0 and enter vehicle direction input step 3.
Proceed to 05. In this vehicle direction input step 305, a 3-bit digital signal indicating the vehicle's traveling direction is input from the compass 13, and the process proceeds to time data input step 306. In this time data input step 306, the digital clock 14 inputs the month, day,
Input time data indicating the hour and read step 30
Proceed to step 7. In this read step 307, the month,
The sun azimuth data B and the corrected air volume data Wa for the time input in the time data input step 306 are read out from the data ROM 15b in which all the sun azimuth data and corrected air volume data for the date and time are stored. In this case, the solar azimuth data B is also expressed as a 3-bit digital signal, similar to the traveling azimuth data A. Then, the process proceeds to the next solar radiation direction calculation step 308, where the solar radiation direction data X is
Obtained by calculating B-A. In this case, the 4th bit of the solar direction data B is set to 1, the 4th bit of the solar direction data A is set to 0, the 4 bits are subtracted, and the lower 3 bits of the result are used as the solar direction data X. seek. In other words, the solar radiation direction data X
The relationship between and the solar radiation insertion position on the vehicle is as shown in Table 2 below.

[Table] Then, the process proceeds to the next outside temperature determination step 309, where it is determined whether or not the outside temperature Tam is greater than or equal to the level determination value β plus the hysteresis value T ₂ (β+T ₂ ). In other words, if heating is required, the judgment will be NO, but if the outside temperature
When Tam is greater than (β+T ₂ ), that is, when heating is unnecessary, the determination becomes YES, and the process proceeds to hysteresis value setting step 310.
In this hysteresis value setting step 310, the value T ₂ for hysteresis for the judgment in the outside temperature judgment step 309 is set to T ₂ =0, and the process proceeds to an output step 311. This output step 311
Then, the actuator 19 switches the solar radiation direction data X,
20, and the calculation process of the wind direction control calculation routine 300 is completed. On the other hand, the determination in the outside temperature determination step 309 is
If NO, the process proceeds to a hysteresis value setting step 312, where T ₂ =Δβ is set in order to provide hysteresis for the judgment in the outside temperature judgment step 309, and the process proceeds to a conversion output step 313. In this conversion output step 313, the solar radiation direction , the calculation process of the wind direction control calculation routine 300 ends. On the other hand, the determination in the infrared determination step 303 is
If NO, hysteresis value setting step 314
Then, in order to provide hysteresis for the determination in the infrared determination step 309, T ₁ =Δα is set, and the flow advances to a correction air volume setting step 315. In this corrected air volume setting step 315, the corrected air volume data Wa is set to Wa=0, and the calculation process of the wind direction control calculation routine 300 is ended. After the wind direction control calculation routine 300, the air volume control calculation routine 400 shown in FIG. Then, a room temperature signal from the room temperature sensor 8 and a setting signal from the temperature setter 9 are inputted via the A/D converter 12 and temporarily stored as the room temperature Tr and set temperature Ts. Then, deviation calculation step 402
Proceed to △ and calculate the deviation △T by the room temperature Tr and set temperature Ts.
It is calculated using the formula T=Tr-Ts, and the process proceeds to step 403 for basic air volume calculation. In this basic air volume calculation step 403, basic air volume data for the deviation △T is calculated.
Wb is determined from the characteristic relationship shown in the figure. and,
Proceeding to the next front air volume increase determination step 404, the solar radiation direction data If any one of them is shown, the judgment becomes YES, but if none of the above is shown, the judgment becomes NO, and the process proceeds to air volume increase judgment step 405. . After this, in the air volume increase determination step 405, the solar radiation direction data X is 100, 011, 101.
i.e. at the rear of the passenger compartment;
It is determined whether either the right rear of the vehicle interior or the left rear of the vehicle interior is indicated, and when either one is indicated, the determination becomes YES, but if neither of them is indicated, the result is YES. The verdict will be NO. That is, since the solar radiation direction data X is either 010 or 110, it is determined that solar radiation is coming from the right or left side of the vehicle interior, and the process proceeds to air volume setting step 406. In this air volume setting step 406, the previous and subsequent output data W ₁ and W ₂ are set to (Wa/2+Wb), and the process advances to output step 407. In this output step 407, the previous and subsequent output data W ₁ and W ₂ are output to the motor drive circuits 17 and 18, respectively, and the calculation process of the air volume control calculation routine 400 is completed. On the other hand, when the judgment in the front air volume increase determination step 404 is YES, the process advances to the air volume setting step 408, sets the front output data _W1 to Wa+Wb, and the rear output data _W2 to Wb, and advances to the output step 407. When the judgment in the rear air volume increase determination step 405 is YES, the process advances to an air volume setting step 409, where the front output data W ₁ is set to Wb and the rear output data W ₂ is set to Wb.
is set to Wa+Wb and the process proceeds to output step 407. After this air volume control calculation routine 400, the process proceeds to a temperature control calculation routine 500. In this temperature control calculation routine 500, all the sensors and actuators are not shown, but the on/off control of the compressor (not shown) in the operation of the air conditioner 1, the opening control of the air mix damper 1d, and the switching control of a switching damper (not shown);
Then, calculation processing for controlling the flow of refrigerant to the evaporator 7b in the operation of the rear cooler device 7 is executed, and the flow returns to the wind direction control calculation routine 300. After that, the calculation process from the wind direction control calculation routine 300 to the temperature control calculation routine 500 is repeated several hundred times.
Repeat at a period of msec. Next, the overall operation of air conditioning control in various states will be sequentially explained. First, when the air conditioner switch is turned on to air condition the interior of the vehicle in a state where the outside temperature is high, the microcomputer 15 to which a stabilized voltage is supplied from the stabilized power supply circuit becomes operational, and the calculation starts at the start step 100 in FIG. start processing,
Proceed to initial setting routine 200, T ₁ =0, T ₂ =
After performing various initial settings including 0 and X=000, the flow advances to the wind direction control calculation routine 300. Then, proceeding to data input step 301, the outside temperature Tam,
Enter the amount of infrared rays T. At this time, if the weather is cloudy, the amount of infrared rays T will be a small value. Then, the process proceeds to the next level calculation step 302, where the level judgment value α is calculated using the formula α=f(Tam)+ _T1 . This level judgment value α becomes a somewhat large value because the outside temperature Tam is high. Therefore, the determination in the next infrared determination step 303 for determining the level of the amount of infrared rays T becomes NO. Then, the process proceeds to hysteresis value setting step 314, where T ₂ =Δα is set for hysteresis, and the process proceeds to corrected air volume setting step 315, where the corrected air volume data Wa is set to Wa.
1 of the wind direction control calculation routine 300.
The calculation process ends. Then, the process proceeds to the next air volume control calculation routine 400, where the room temperature Tr and set temperature Ts are input in a data input step 401, and the process proceeds to a deviation calculation step 402, where the deviation △T is calculated using the formula △T = Tr - Ts. Then proceed to basic air volume calculation step 403 and calculate the deviation △.
Find the basic air volume data Wb for T. Then, the process proceeds to step 404 for determining the _increase in front air volume, and since the solar radiation direction data
Then, set the post-output data _W2 to Wb. but,
Since the corrected air volume data Wa is set to Wa=0 in the corrected air volume setting step 315, both the front and rear output data W ₁ and W ₂ become Wb. and,
Proceeding to output step 407, the front and rear output data W ₁ and W ₂ are output to the motor drive circuits 17 and 18, respectively, and one calculation process of the air volume control calculation routine 400 is completed. Then, the process proceeds to the temperature control calculation routine 500 to execute various calculation processes for temperature control, and then returns to the wind direction control calculation routine 300. Thereafter, by repeating the calculation process from the wind direction control calculation routine 300 to the temperature control calculation routine 500 at a cycle of several hundred milliseconds, the air conditioning in the vehicle interior is uniformly controlled. Thereafter, when the weather changes from cloudy to clear, data input step 30 of the wind direction control calculation routine 300 is performed.
The amount of infrared rays T input in step 1 becomes a large value due to the influence of solar radiation. Therefore, infrared determination step 3
03 is reversed from NO to YES, the process proceeds to hysteresis value setting step 304 to set T ₁ =0, proceeds to vehicle direction data input step 305 to input heading data A, and time data input step 306. The program then proceeds to step 307 to input the time data of month, date, and hour, and then proceeds to readout step 307 to read out the sun direction data B and corrected air volume data Wa. Then, the process proceeds to a solar radiation direction calculation step 308, where solar radiation direction data X is calculated using the calculation formula: X=B-A, and the process proceeds to an outside temperature determination step 309. At this time, the outside temperature
Since Tam is in a high state, the determination becomes YES, and the process proceeds to hysteresis value setting step 310 to set T ₂ =0, and output step 311.
Proceed to and switch the solar radiation direction data X to actuator 1.
9 and 20, and one calculation process of the wind direction control calculation routine is completed. Then, in the next air volume control calculation routine 400, solar radiation direction data
_The solar radiation _direction is determined by
Set. Then, the process proceeds to output step 407, where the front and rear output data W ₁ and W ₂ are sent to the motor drive circuits 17 and 18, and the air volume control calculation routine 400 is executed.
One calculation process is completed. Therefore, by performing a series of calculations from the wind direction control calculation routine 300 through the air volume control calculation routine 400 to the temperature control calculation routine 500 at a cycle of several hundred milliseconds, the direction and intensity of solar radiation can be determined. Appropriately adjust the blowing direction and blowing air volume to eliminate the influence amount. Therefore, the air conditioning balance in the vehicle interior can be adjusted appropriately. On the other hand, when the outside temperature is low and the weather is clear, such as in winter, when the air conditioner switch is turned on to heat the room, when the outside temperature determination step 309 in the wind direction control calculation routine 300 is reached, the determination will be NO. Then, the program proceeds to a hysteresis value setting step 312 to set T ₂ =Δβ, and then proceeds to a conversion output step 313 to issue solar radiation direction data X, in which the solar radiation direction is reversed from left to right and front to back, to the switching actuators 19 and 20. , one calculation process of the wind direction control calculation routine 300 is completed. For this reason, the output data W ₁ and W ₂ before and after being output to the motor drive circuits 17 and 18 in the next air volume control calculation routine 400 are also reversed left and right and front and back with respect to the solar radiation direction. Therefore, the calculation process from the wind direction control calculation routine 300 to the temperature control calculation routine 500 requires hundreds of calculations.
By repeating this at a cycle of msec, the proportion of air conditioning in directions that are not exposed to solar radiation is increased. Therefore, the air conditioning balance in the vehicle interior can be adjusted appropriately. In the above embodiment, the data ROM 15b serving as a storage section stores the solar azimuth data B and the corrected airflow data Wa, but in order to perform even more precise solar radiation correction, solar altitude data may be added to the above data. In addition, when the sun shines almost directly overhead, such as in midsummer, the air conditioning ratio within the vehicle interior may not be changed in order to maintain the air conditioning balance. Further, instead of storing the corrected air volume data Wa, the corrected air volume may be determined in correspondence with an infrared signal from the infrared detector 10 in order to correct the air volume for the actual amount of solar radiation. Although the digital clock 14 is shown as a clock device, its clock operation is controlled by the microcomputer 1.
5 may be performed. Furthermore, although the microcomputer 15 is shown as the arithmetic processing means, a hard logic configuration using electronic circuits may be used. Furthermore, when it is determined that the amount of solar radiation is large in the infrared determination step 303, solar radiation direction data X is obtained and outputted. When it is determined that the amount of solar radiation is large, the solar radiation direction data X may be output. As described above, in the first invention of the present application, it is confirmed that solar radiation has an influence on the air conditioning in the vehicle interior, and the solar radiation at that time is determined based on the relationship between the time and the solar radiation direction stored in advance. The direction is read out, the traveling direction of the vehicle is detected, and at the time of the confirmation, the solar radiation direction into the vehicle interior is determined from the solar radiation direction and the traveling direction, and the air conditioning ratio to each part of the vehicle interior is changed with respect to the solar radiation direction to calculate the solar radiation. The advantage is that it is possible to accurately determine the direction of solar radiation and perform air conditioning correction for solar radiation without installing multiple sensors to detect the temperature balance state in the vehicle interior due to the influence of solar radiation. It has a positive effect. Furthermore, the second invention of the present application has the excellent effect that the vehicle air conditioning control method in the first invention can be appropriately performed based on the detection of the amount of solar radiation on the vehicle.

[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 overall calculation processing by the air conditioning control program of the microcomputer in Fig. 1; Fig. 3 is a calculation flowchart showing the detailed calculation processing of the wind direction control calculation routine in Fig. 2; This figure is a calculation flowchart showing detailed calculation processing of the air volume control calculation routine in FIG. 1a, 7a... Blower motor, 2, 6... Outlet switching damper, 10... Infrared detector as solar radiation detection means, 13... Direction meter, 14... Digital clock as a timing device, 15... Calculation A microcomputer as a processing means, 15b...Data ROM as a storage unit, 17, 18...Motor drive circuit, 19, 20...Switching actuator.

Claims (1)

[Scope of Claims] 1. A vehicle air conditioning control method that corrects the solar radiation by changing the air conditioning ratio to each part of the vehicle interior with respect to the direction of solar radiation entering the vehicle interior, comprising: check that the solar radiation direction has an influence, read the solar radiation direction for that time based on the relationship between the time and the solar radiation direction stored in advance, detect the traveling direction of the vehicle, and at the time of said confirmation, based on the solar radiation direction and the said traveling direction. A vehicle air conditioning control method characterized by determining the direction of solar radiation into a vehicle interior. 2. An air conditioning control device for a vehicle, comprising means for determining the direction of solar radiation entering the vehicle interior, and means for correcting the solar radiation by changing the air conditioning ratio to each part of the vehicle interior in accordance with the direction of the solar radiation. , a solar radiation detection means for detecting the amount of solar radiation on the vehicle, a compass for detecting the traveling direction of the vehicle, a clock device for timing the current time, and a storage unit that stores in advance the relationship between the time and the solar radiation direction. determining that the amount of solar radiation detected by the solar radiation detection means is equal to or higher than a predetermined level, reading the solar radiation direction relative to the current time in the clock device from the storage unit, and determining the solar radiation direction and the direction at the time of the determination. 1. An air conditioning control device for a vehicle, characterized by comprising arithmetic processing means for determining the direction of solar radiation into a vehicle interior based on the direction of travel detected by the sensor.