JPH02128912A - Air conditioning control device for vehicle - Google Patents

Abstract

PURPOSE:To always obtain comfortable air conditioning feeling by changing the coefficient of operation for set temperature in a composite signal according to thermal load conditions to correct a control signal outputted to a thermal load adjusting means even when a temperature setting means has the same variation. CONSTITUTION:A means 140 computes thermal load conditions on temperature in a car room detected by means 100-120 respectively, outside air temperature and quantity of solar radiation, and the temperature in the car room set by a means 130. A means 150 computes importance to be given to set value in the means 130 according to the computed value of the means 140. A means 160 computes a composite signal for the thermal load conditions on the detected values of the means 100-120, the set value of the means 130 and the computed value of the means 150. A means 180 drives a means 170 to adjust the thermal load including a duct, a blower and a heat exchanger according to the computed value of the means 160. Thus comfortable air conditioning feeling can be always obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicle air conditioning control device, and particularly to one that automatically controls air conditioning equipment based on vehicle interior temperature, outside air temperature, and the like.

(Prior art) Conventionally, as this type of device, for example,
As shown in Publication No. 334, a control signal corresponding to the heat load in the vehicle interior is calculated based on the vehicle interior temperature, outside air temperature, set temperature, etc., and the heat of the blower, air mix door, etc. is controlled according to the calculated value. Devices for controlling the operation of exchange equipment are known.

In such a device, the change in the control signal corresponding to the change in the set temperature is constant, that is, the calculation constant added to the set temperature in the above-mentioned control signal calculation is constant, and as a result, the vehicle interior temperature remains unchanged from the set temperature. The air conditioning is controlled to bring the temperature closer to that temperature.

(Problem to be solved by the invention) However, the actual air conditioning feeling is
It is influenced by environmental conditions.

For this reason, even if the set temperature is the same, for example, when there is strong sunlight in the summer, the cooling sensation will be insufficient compared to when there is no solar radiation, so in the end, you will have to set the temperature setting device higher than usual to make it comfortable. There was a problem in that the feeling of air conditioning could not be obtained.

In particular, the above-mentioned problem becomes even more apparent when the air conditioner has a configuration in which temperature settings are set in stages using several switches in order to simplify the operation panel.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide an air conditioning control device for a vehicle that can solve the problems of the conventional example and provide a comfortable air conditioning feeling.

(Means for Solving the Problems) Therefore, as shown in FIG. 1, the constituent elements of the vehicle air conditioning control device according to the present invention are: a vehicle interior temperature detecting means 100 for detecting the temperature inside the vehicle; an outside temperature detection means 110 for detecting the amount of solar radiation, a solar radiation amount detection means 120 for detecting the amount of solar radiation, and a temperature setting means 130 for setting the temperature inside the vehicle interior.
and a heat load condition calculation means 140 that calculates a heat load condition based on the detected values of the vehicle interior temperature detection means 100, the outside air temperature detection means 11O1, the solar radiation amount detection means 120, and the set value of the temperature setting means 130. a setting means temperature gain calculating means 150 that calculates the weighting of the set value of the temperature setting means 130 according to the calculated value of the heat load condition calculating means 140; and the outside air temperature detecting means 110, a comprehensive signal calculating means 160 for calculating a heat load condition based on each detected value of the solar radiation amount detecting means 120, a set value of the temperature setting means 130, and a calculated value of the set temperature gain calculating means 150; A heat load adjusting means 170 including a duct opening into the vehicle interior, a blower disposed in the duct and blowing air toward the vehicle interior, and a heat exchanger for exchanging heat of the air passed by the blower; A driving means 180 is provided for driving the heat load adjusting means 170 according to the calculated value.

(Function) Therefore, the heat load condition is calculated by the heat load condition calculation means using the vehicle interior temperature, outside temperature, solar radiation amount, and set temperature as parameters, and the gain of the set temperature used in the comprehensive signal calculation means is determined according to the calculated value. is calculated by the set temperature gain calculating means, and the heat load is calculated by the general signal calculating means based on this calculated value and the above-mentioned parameters. Therefore, even if the amount of change in the temperature setting means is the same, the thermal load is calculated according to the heat load condition. The control signal output to the heat load adjusting means is corrected, and therefore the above object can be achieved.

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

In FIG. 2, the vehicle air conditioning control device is provided with an intake door switching device 2 on the most upstream side of an air conditioning duct 1, and this intake door switching device 2 has an internal air population 3 and an outside air population 4.
An inside/outside air switching door 5 is disposed at the separated part, and by operating this inside/outside air switching door 5 with an actuator 6, the air introduced into the air conditioning duct 1 can be selected between inside air and outside air.

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

The evaporator 8 includes a compressor 10 and a capacitor 11.
, liquid tank 12 and expansion valve 13
The compressor 10 is connected to the engine 14 via an electromagnetic clutch 1 to form a cooling cycle.
The electromagnetic clutch 15 is connected via the electromagnetic clutch 15, and is controlled to be turned on and off by turning on and off the electromagnetic clutch 15. Further, the heater core 9 is configured so that cooling water from the engine 14 circulates therethrough to heat the air. An air mix door 16 is provided in front of the heater core 9, and by adjusting the opening degree of the air mix door 16 using an actuator 17, air passing through the heater core 9 and air bypassing the heater core 9 can be separated. The amount of air is changed, and as a result, 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, which open into the vehicle interior 21, and mode doors 22a, 22b, and 22c are provided in the divided portions. , this mode door 2
By operating 2a, 22b, and 22c with an actuator 23, a desired blowing mode can be obtained.

And the actuator 6.1? , 23, blower 7
The t-magnetic latch 15 of the compressor 10 is controlled based on output signals from the microcomputer 25 via drive circuits 24a to 24e, respectively. This microcomputer 25 includes a central processing unit (CPU) (not shown).
), a read-only memory (ROM), a random access memory (RAM), an input/output capacitor (Ilo), etc. Each output signal from the vehicle interior temperature sensor 26 that detects the vehicle interior temperature T from the sensor 26, the outside air temperature sensor 27 that detects the outside temperature TA, the solar radiation sensor 28 that detects the amount of solar radiation Ts, and the air mix door described above. Opening degree detector 2 that detects the opening degree of 16
The output signal ex from 9 is sent to the multiplexer (MPX>31
The signal is selected via the A/D converter 32, and is converted into a digital signal and input.

Furthermore, an output signal from the operation panel 34 is input to the microcomputer 25 . This operation panel 34 sets the rotation speed of the blower 7 to LOW and MED.

Manual switches 35a to 35d1 to switch to H [, MAX HI, AUTO switch 35e to automatically control the operation of the blower 7, compressor 10, etc., OFF switch 35f to stop the operation of the blower 7, etc., and OFF switch 35f to operate the compressor 0. A/C switch 36, changeover switch 37 for introducing inside air or outside air, mode switches 38a to 38d for changing blowout mode, and temperature setting device 3
It is equipped with 9.

The temperature setting device 39 consists of an up/down switch 39a and a display section 39b that displays the set temperature Td, and the set temperature shown on the display section 39b can be changed within a predetermined range by operating the switch 39a. It is something. The temperature setting device may be one in which a template lever is slid, or one in which the temperature setting is set in stages using several switches.

FIG. 3 shows an example of control of the vehicle air conditioning control device by the microcomputer 25 described above as a flowchart, and its functions will be described below with reference to the same figure.

The microcomputer 25 starts executing the program from step 5o, and in the next step 52 inputs the vehicle interior temperature T11%, the outside air temperature &T, and the solar radiation amount Ts sequentially via the multiplexer 31 and the A/D converter 32. At the same time, the set temperature Td is inputted from the temperature setter 39 of the operation panel 34 and stored in a predetermined area of the RAM.

Then, the process proceeds to the next step 54, and for example, the following calculation formula (
1), the heat load condition in the vehicle interior is calculated as the heat load condition signal Q.

Q = Q! (TR-Td) 10βTs+ r (TA2
5) 09. (1) However, α, β, and γ are calculation coefficients (constants).

Here, a state in which the heat load condition signal Q is positive (() means that the heat load condition is a cooling load condition, and Q increases as the cooling load condition increases.

Further, a state in which Q is negative (-) means that the heat load condition is a heating load condition, and Q becomes smaller as the heating load condition becomes larger.

After the above Q calculation, in step 56, the set temperature gain Kd is calculated based on a predetermined basic pattern. According to this basic pattern, when the heat load condition is large, the heat load condition signal Q moves greatly toward the (+) or (-) side, so that Kd becomes a large value.

After step 56, in step 58, the heat load inside the vehicle compartment is calculated as a total signal T using, for example, the following calculation formula (2).

T"K+tTt+KaTa+KsTs-KdTd+C-
...(2) However, KR+KAI KAI C is an operation coefficient (constant) or an operation constant, and Kd is the step 56.
This is the set temperature gain calculated by .

Here, the larger the value of the overall signal T, the stronger the demand for cooling, and the smaller the value, the stronger the demand for heating.

Since the set temperature gain Kd becomes larger as the heat load condition becomes larger as described above, this overall signal T becomes larger when the cooling load condition is large than when the cooling load condition is small. , when the heating load condition is large, T becomes small.

In step 60, in accordance with the overall signal T, for example, the opening degree θ× of the air mix door 16, the air volume of the blower 7, etc. are calculated based on a predetermined basic pattern.

Further, the drive circuit 24b is based on the above-mentioned calculated value.

The air mix door 16 and the blower 7 are controlled via step 24d, and then the process returns to the main routine via step 7o.

Therefore, in the above operation example, the heat load condition signal Q
The larger the absolute value of the temperature gain Kd, the larger the set temperature gain Kd becomes.
The control amount can be increased.

(Effect of the invention) Therefore, since the calculation coefficient of the set temperature in the overall signal is changed according to the heat load conditions, even if the amount of change in the temperature setting means is the same, the heat load can be adjusted according to the heat load conditions. The control signal output to the device is corrected, and the problem that conventionally occurs when there is strong solar radiation in the summer, when the cooling sensation is insufficient compared to when there is no solar radiation, is resolved, and the set amount of the temperature setting device is adjusted to normal. It is possible to provide an air conditioning control device for a vehicle that provides a comfortable air conditioning feeling without having to set a larger amount.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram of a vehicle air conditioning control device according to the present invention, FIG. 2 is a configuration diagram of the same vehicle air conditioning control device,
FIG. 3 is a flowchart showing an example of the control operation of the vehicle air conditioning control device same as above. 100... Vehicle interior temperature detection means, 110... Outside air temperature detection means, 120... Solar radiation amount detection means, 130...
・Temperature setting means, 140...Heat load condition calculation means, 1
50... Set temperature gain calculation means, 160... Comprehensive signal calculation means, 170... Heat load adjustment means, 180.
...Driving means.

Claims (1)

[Claims] Vehicle interior temperature detection means for detecting the temperature inside the vehicle interior, outside temperature detection means for detecting the outside temperature, solar radiation amount detection means for detecting the amount of solar radiation, and a temperature for setting the temperature inside the vehicle interior. a setting means; a heat load condition calculating means for calculating a heat load condition based on each detection value of the vehicle interior temperature detecting means, the outside air temperature detecting means, the solar radiation amount detecting means, and the set value of the temperature setting means; a set temperature gain calculating means for calculating weighting of the set value of the temperature setting means according to the calculated value of the heat load condition calculating means; each of the vehicle interior temperature detecting means, the outside air temperature detecting means, and the solar radiation amount detecting means; a comprehensive signal calculation means for calculating a heat load condition based on the detected value, the setting value of the temperature setting means, and the calculation value of the set temperature gain calculation means; a duct opening into at least the passenger compartment; A heat load adjusting means including a blower that blows air toward the vehicle interior, a heat exchanger that exchanges heat with the air passing through the blower, and a driving means that drives the heat load adjusting means in accordance with a calculated value of the comprehensive signal calculating means. A vehicle air conditioning control device comprising: