JPH058630A - Solar radiation correcting control device of air-conditioning device for automobile - Google Patents

Abstract

PURPOSE:To improve the accuracy of temperature control in a car room in consideration of the influence of the solar radiation. CONSTITUTION:While the conductive heating value invading through the wall of a vehicle is calculated by a conductive heating value operation means 120, the radiant heating value invading through the window of the vehicle is calculated by a radiant heating value operation means 130, depending on the solar radiation amount detected by a solar radiation detecting means 11, and the solar radiation correcting values to these heating values are calculated in a correcting value operation means 140. And by correcting the setting condition of an air-conditioning apparatus 100 depending on the correcting values in a control means 150, the influences of the conductive heat and the radiant heat are dealt with separately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar radiation correction control device for an automobile air conditioner, which corrects the temperature control in a vehicle compartment in accordance with the solar radiation state.

[0002]

2. Description of the Related Art Heat received by an occupant in a passenger compartment from the outside environment is divided into outside air heat and insolation heat that enter through conduction or radiation from a vehicle wall or window. In the case of controlling the temperature control in the vehicle compartment by taking into account the heat of the outside air and the heat of the solar radiation, conventionally, the total signal T is calculated, for example, by the equation 1, and the operating state of each air conditioner is adjusted based on the signal T. I was doing.

[0003]

[Number 1] _{T-A (T A -25)} + B (T R -25) + C (T SET -25) + D (T S - 25) + E

Here, A, B, C, D and E are calculation constants, T _A is the outside air temperature, T _R is the passenger compartment temperature, T _SET is the target preset temperature in the passenger compartment, and T _S is the amount of solar radiation. Each temperature is indicated and each temperature has a required time constant.

That is, in the equation (1), the first to fourth terms on the right side correspond to the correction terms for calculating the correction amount corresponding to the deviation of each temperature from the optimal sensation temperature (25 degrees). The effects of outside air conduction and radiation were taken into consideration in the first item of outside air correction, and the effects of insolation conduction and radiation were taken into account in the fourth item of solar radiation correction.

The weights A, B, C, and D of the respective correction terms are determined in advance by an experiment in which each temperature parameter is changed to find a value such that an optimum sensible temperature state can be obtained under each temperature environment. .. Further, in general, the time constant of T _S is made much smaller than the time constant of T _A.

[0007]

However, the heat due to the conduction or radiation of the outside air does not change abruptly, so it may be handled as a whole by the outside air correction term. The heat of radiation is
It is not possible to handle this with the same correction term, because the solar radiation state often changes rapidly.

In other words, the conduction heat that penetrates through the wall portion due to solar radiation is moderately transferred, but the radiation heat that directly penetrates through the window portion is extremely fast, and when the vehicle enters the shade and the sunlight disappears, While the effect of radiant heat on the occupant decreases rapidly, the effect of conduction heat does not decrease rapidly in the shade and remains for a long time.

For this reason, if the conduction heat and the radiant heat are treated as the same, even if the solar radiation correction term fluctuates and the temperature control state deviates from the optimum state even if the influence of solar radiation continues, The control system was not always good.

In view of the above, it is an object of the present invention to provide a solar radiation correction control device for an automobile air conditioner, which is capable of improving the above points and realizing a more accurate temperature control.

However, the gist of the present invention is, as shown in FIG. 1, an air conditioner 100 for adjusting the air conditioning state of the vehicle interior and a solar radiation detecting means 110 for detecting the amount of solar radiation.
And a conduction heat quantity computing means 120 for computing the quantity of conduction heat entering through the vehicle wall portion based on the output from the solar radiation detecting means 110, and entering through the vehicle window portion based on the output from the solar radiation detecting means 110. A radiant heat amount calculating means 130 for calculating a radiant heat amount, a correction amount calculating means 140 for respectively calculating a solar radiation correction amount from the conduction heat amount and the radiant heat amount,
And a control unit 150 for correcting the setting state of the temperature control device according to the output of the correction amount calculation unit 140.

[0012]

Therefore, based on the amount of solar radiation detected by the solar radiation detecting means, the amount of conductive heat entering the vehicle interior through the vehicle wall portion is calculated by the amount of conductive heat, and the correction amount calculating means conducts this solar radiation. A correction amount corresponding to the component is calculated.

At the same time, the radiant heat amount calculating means calculates the radiant heat that directly enters the vehicle interior through the vehicle window portion, and the correction amount calculating means calculates the correction amount corresponding to the radiant component of the solar radiation. ..

Since the setting state of the air conditioner is corrected by the control means in accordance with each correction amount, it is possible to perform the solar radiation correction control in which the influences of the conduction heat and the radiation heat due to the solar radiation are separately considered, and therefore the above-mentioned problem is solved. Is something that can be achieved.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 2, an air conditioner for a vehicle includes an air conditioning duct 1
The inside / outside air switching device 2 is provided on the most upstream side of the intake door 5. The inside / outside air switching device 2 has an intake door 5 arranged at a portion where the inside air inlet 3 and the outside air inlet 4 are separated.
The air conditioning duct 1 by operating the actuator 6
The air introduced into the interior can be selected from inside air and outside air.

The blower 7 sucks air into the air-conditioning duct 1 and blows it to the downstream side, and an evaporator 8 and a heater core 9 are provided behind the blower 7.

The evaporator 8 is connected to a compressor 10, a condenser 11, a liquid tank 12 and an expansion valve 13 by piping to form a cooling cycle, and the compressor 10 is connected to an engine 14 of an automobile through an electromagnetic clutch 15. The electromagnetic clutch 15 is turned on and off to be turned on and off. The heater core 9 is adapted to circulate the cooling water of the engine 14 to heat the air.

An air mix door 16 is provided in front of the heater core 9, and the air passing through the heater core 9 and the air bypassing the heater core 9 are adjusted by adjusting the opening of the air mix door 16 with an actuator 17. The amounts of and are changed so that the temperature of the blown air is controlled.

The downstream side of the air conditioning duct 1 is divided into a defrost outlet 18, a vent outlet 19 and a heat outlet 20 and opens into a passenger compartment 21. Mode doors 22a and 22b are provided at the divided portions. By operating the mode doors 22a and 22b with the actuator 23, a desired blowout mode can be obtained.

Reference numeral 25 is a vehicle interior temperature sensor for detecting the temperature T _R of the air in the vehicle interior, 26 is a solar radiation sensor for detecting the amount of solar radiation Q _S , and 27 is an outside air temperature sensor for detecting the outside air temperature T _A. A signal is a multiplexer 2 for selecting a signal.
It is input to the A / D converter 30 via 9, and converted into a digital signal here and input to the microcomputer 31. Further, the output signal from the operation panel 32 is input to the microcomputer 31.

The operation panel 32 has an A / C switch 33 for operating the compressor 10 and an ECON switch 34 for economical compressor control. Each air conditioner is automatically controlled when any one of these switches is pressed. Enter the mode.

The operation panel 32 includes an OFF switch 35 for stopping the operation of the air conditioner, a DEF switch 36 for setting the blowout mode to the defrost mode, a temperature setter 37 for setting the set temperature T _SET in the passenger compartment, and a blowing capacity. A blower capacity setting device 38 for setting the above, a blowout mode setting device 39 for setting a blowout mode other than the defrost mode, and a suction mode setting device 40 for setting a suction mode, and set temperature, blown capacity, blow mode, suction mode But display circuit 4
1 is displayed on the display unit 42 controlled by the microcomputer 31.

The microcomputer 31 includes a central processing unit (CPU) (not shown) and a read-only memory (RO).
M), a random access memory (RAM), an input / output port (I / O), etc., which are known per se, and based on the above-mentioned various input signals, the actuators 6, 7,
23, a control signal is output to the motor of the blower 7 and the electromagnetic clutch 15 via the drive circuits 43a to 43e, respectively.
The drive control of each door 5, 16, 22a, 222b, the rotation control of the blower 7, and the ON / OFF control of the electromagnetic clutch 15 are performed.

In FIG. 3, an example of automatic control operation by the microcomputer 31 described above is shown as a flow chart. The microcomputer 31 starts execution of this program from step 50 by turning on an ignition switch, for example, and in step 52, the vehicle Indoor temperature sensor 25, solar radiation sensor 26, outside air temperature sensor 27,
The output signal from the temperature setter 37 is input.

Then, in the next step 54, an insolation correction amount of the integrated signal T which will be described later is calculated. In particular,
As shown in FIG. 4, first, the sun altitude φ is calculated in step 62, and the sun azimuth i is calculated in step 64. These arithmetic processes are already known, and only the outline of the arithmetic processes will be described here.

The solar radiation sensor 26 is arranged at the center of the upper surface of the instrument panel 42 of the vehicle and has, for example, two light receiving elements which are tilted to the left and right, and the solar radiation direction entering the vehicle through the windshield 43 ( Due to the deviation i from 0 °), the output signal intensity of the light receiving element on the deviated side is increased.

Further, the overall output signal strength increases as the deviation φ of the sun from the horizontal direction (0 °) increases, and the ratio of the signal strengths of the left and right light receiving elements,
The sun direction and altitude are calculated from the overall intensity level.

In step 66, the heat quantity Q _S1 applied to the roof of the vehicle is calculated from the equation 2 based on the sun altitude φ. Further, in the next step 68, the heat quantity Q _S2 radiated to the side wall of the vehicle is set to the sun altitude φ and the sun azimuth i.
Based on

[0029]

[Formula 2] Q _S1 = A ₁ Q _S sin φ

[0030]

[Formula 3] Q _S2 = A ₂ Q _S cos φ

Here, A ₁ represents the area of the vehicle roof, and A ₂ represents the area of the side wall.

Since the heat quantity of the entire vehicle wall portion is a combined heat quantity obtained by adding the ROOF heat quantity Q _S1 and the side wall heat quantity Q _S2 , the heat quantity combination shown in Formula 4 is performed in step 70, and in the next step 72. , The converted amount of heat is converted into a temperature corresponding to this.

[0033]

[Formula 4] Q _S3 = Q _S1 + Q _S2

[0034]

[Formula 5] α · T _S = Q _S3 / M

In Equation 5, α and M represent arithmetic constants, and α · T _S is a value corresponding to the heat conduction component of solar radiation, with a large time constant delay in conversion.

On the other hand, in step 74,
For example, the solar radiation signal Q _S from the solar radiation sensor 26 is delayed by a small time constant to calculate the radiation component T _S 'of solar radiation.

As described above, the small time constant is applied to the radiant component of the solar radiation and the large time constant is applied to the conductive component. This is because the heat received by the occupant when the solar radiation entering through the window changes rapidly. The feeling fluctuates rapidly, so I want to quickly change the radiation component to prevent it, while the conduction heat entering through the wall changes slowly, so it is necessary to correct the temperature control to match this. is there.

Then, in step 56, as shown in the equation 6, the conduction component of the solar radiation is added to the control signal T _A by the outside air to obtain the total heat T _WALL received from the external environment excluding the radiation component of the solar radiation, In step 58, the total signal T is calculated based on the equation 7.

[0039]

[ _Equation 6] T _WALL = T _A + α ・ T _S

[0040]

Equation 7] _{T = A · (T WALL -25} ) + B · (T A -25) + C · (T SET -25) + D · (T S '-25) + E

Here, A, B, C, D, and E are operation constants, which are determined in advance by the same method as the method of obtaining the operation constants of Equation 1.

Thereafter, in step 60, the setting state of the air conditioner is calculated based on the comprehensive signal T, and a control signal is output to each air conditioner via each of the drive circuits 43a to 43e.

Therefore, the influence of solar radiation is divided into conduction and radiation, and a small time constant is applied to the radiation component and a large time constant is applied to the conduction component. Considering the case of entering, in response to the rapid decrease in radiant heat, the correction condition of the fourth term on the right side of Equation 7 is promptly changed to correct the setting condition of the air conditioning equipment, and at the same time, the conduction heat is gradually decreased. In contrast, the correction term of the first term on the right side is slowly changed to correct the setting state of the air conditioner.

Also, in the case of going from the shade to the sun, the sudden increase of the radiant heat is corrected in the fourth item, and the slow increase of the conductive heat is set in the first item of the air conditioner. Can be corrected and a comfortable temperature control can be maintained.

In this embodiment, the outside air correction and the correction of the conduction component of solar radiation are collectively treated in the first term of the equation 7, but they may be treated as separate correction terms.

[0046]

As described above, according to the present invention,
The effects of solar radiation are divided into those due to conduction and those due to radiation, and the respective correction amounts are calculated to drive and control the air conditioning equipment, so both rapid changes in radiant heat and slow changes in conductive heat are taken into consideration. The solar radiation can be corrected, and the control system can be improved.

[Brief description of drawings]

FIG. 1 is a functional block diagram of a solar radiation correction control device according to the present invention.

FIG. 2 is a schematic configuration diagram showing an embodiment of an automobile air conditioner according to the present invention.

FIG. 3 is a flowchart showing an example of solar radiation correction operation by the microcomputer in the above.

FIG. 4 is a flowchart showing a subroutine of solar radiation control signal calculation processing of the flowchart in the above.

FIG. 5 is an explanatory diagram showing a relationship between a vehicle and a sun direction and a sun altitude.

[Explanation of symbols]

 100 Air Conditioning Equipment 110 Solar Radiation Detecting Means 120 Conductive Heat Amount Calculating Means 130 Radiant Heat Amount Calculating Means 140 Correction Amount Calculating Means 150 Control Means

Claims (1)

Claim: What is claimed is: 1. An air conditioner for adjusting an air conditioning condition in a vehicle interior, a solar radiation detecting means for detecting an amount of solar radiation, and an intrusion through a vehicle wall portion based on an output from the solar radiation detecting means. A conduction heat amount calculation means for calculating a conduction heat amount, a radiation heat amount calculation means for calculating a radiation heat amount entering through a vehicle window based on an output from the solar radiation detection means, and a solar radiation correction amount from the conduction heat amount and the radiation heat amount. A solar radiation correction control device for an air conditioner for an automobile, comprising: a correction amount calculation means for calculating each of them; and a control means for correcting a setting state of the temperature control device according to an output of the correction amount calculation means.