JPH06262928A - Air conditioner for twin type vehicle - Google Patents

Abstract

PURPOSE:To optimize the blow-off temperature of a rear side air conditioning unit in an air conditioner for twin type vehicle, which has a front side air conditioning unit and the rear side air conditioning unit. CONSTITUTION:When a rear side air conditioning unit is in an A/C ON mode for allowing the operation of a compressor, the optimum correction gain of the temperature of a rear side evaporator is fuzzy-inferred by a fuzzy inference calculation means corresponding to the ON-time integrated value and the OFF- time integrated value of the compressor in a predetermined period of time to be inputted from an ON/OFF temperature calculation means. The temperature of the rear side evaporator is calculated by a rear evaporator temperature calculation means based on the room temperature in the rear side from the correction gain and the room temperature sensor for the rear, and a rear side air mix door is controlled by a rear air mix door control means based on the calculated result.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twin mounted on a vehicle such as a so-called one-box car having a front air conditioning unit provided on the front side of the vehicle and a rear air conditioning unit provided on the rear side thereof. BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a type vehicle air conditioner, and more specifically, to control of an air missile door of a rear air conditioning unit.

[0002]

2. Description of the Related Art As one of the prior arts related to the present invention, there is a vehicle air conditioner described in Japanese Patent Publication No. 59-39335. It controls the air mix door by a constant evaporator temperature provided by a fixed resistance and an integrated signal representing the amount of heat load that should control the room to a set temperature when the compressor is in its on mode of operation. However, when the compressor is in the off mode in which its driving is prohibited, the air mix door is controlled by the evaporator temperature given by the temperature sensor provided on the downstream side of the evaporator and the above-mentioned comprehensive signal. By doing so, even when the compressor is stopped and the outside air is introduced, the air mix door is corrected according to the difference in resistance value between the fixed resistance and the temperature sensor, and the sudden change in the blowout temperature is prevented. .

[0003]

By the way, when the outside air temperature is 5 ° C. or less and the outside air temperature is low, even if the compressor is in the ON mode in which the drive is allowed, when the outside air is introduced, the suction temperature is Since the temperature is lower than the on / off temperature of, the magnet clutch that drives the compressor is not turned on.

If the above-mentioned conventional technique is applied to a twin type vehicle air conditioner having a front air conditioning unit provided on the front side of the vehicle and a rear air conditioning unit provided on the rear side of the vehicle, the air of the rear air conditioning unit is applied. Since the intake port is only on the inside air side, even if the compressor is not operating even if it is in ON mode, the evaporator temperature of the rear air conditioning unit will be close to the room temperature of the rear,
The compressor does not turn on because the suction temperature on the front side becomes lower than the on / off temperature of the compressor.In the above cases, since the compressor is in the on mode, the temperature due to the fixed resistance is the evaporator temperature of the rear air conditioning unit. As a result, the air mix door of the rear side air conditioning unit is controlled by a temperature extremely lower than the actual evaporator temperature of the rear side air conditioning unit. As a result, the blowing temperature of the rear becomes extremely higher than the target temperature, which causes a problem that the passenger in the rear seat becomes uncomfortable.

The present invention has been made based on the above viewpoint, and an object of the present invention is to provide a twin type vehicle air conditioner having a front side air conditioning unit and a rear side air conditioning unit to obtain an optimum blowout temperature of the rear side air conditioning unit. An object of the present invention is to provide an air conditioning system for twin type vehicles, which is effective for realization.

[0006]

In the present invention, FIG.
In a twin type vehicle air conditioner having a front side air conditioning unit provided on the front side of the vehicle and a rear side air conditioning unit provided on the rear side of the vehicle as shown in FIG. ON / OFF time calculating means for detecting the ON time and OFF time of the compressor and calculating the ON time integrated value and OFF time integrated value of the compressor within the predetermined time in the A / C ON mode. Control rules that use the on-time integrated value and off-time integrated value of the compressor in the above as the antecedent variable and the correction gain of the evaporator temperature of the rear air conditioning unit as the antecedent variable, and the on-time integrated value and the off Memorize fuzzy set membership functions for time integration value and correction gain The memory means and the input on-time integrated value and off-time integrated value in response to the compressor on-time integrated value and off-time integrated value from the on / off time calculating means, and the control rule and membership of the memory means. Fuzzy inference calculation means for fuzzy inferring the optimum correction gain for the input integrated value of on-time and integrated value of off-time based on the function, and detecting the room temperature on the rear side where the rear air conditioning unit is provided Based on the rear side room temperature sensor detected by the rear room temperature sensor, the fuzzy inference calculation means and the rear room temperature sensor, and the correction gain obtained by the fuzzy inference calculation means. Rear evaporator temperature calculation means for calculating the evaporator temperature of the rear side air conditioning unit, and In the case of the A / C on mode in which the rear air conditioning unit responds to the evaporator temperature calculating means and allows the compressor to be driven, the rear air conditioning unit is calculated based on the evaporator temperature calculated by the rear evaporator temperature calculating means. The above object is achieved by a twin type vehicle air conditioner having a rear air mix door control means for controlling the air mix door.

[0007]

According to the above construction, when the rear air conditioning unit is in the A / C on mode in which the drive of the compressor is allowed,
The optimum correction gain of the evaporator temperature of the rear air conditioning unit is fuzzy inferred and fuzzy inferred according to the on-time integrated value and the off-time integrated value of the compressor within the predetermined time input from the on / off time calculating means. The evaporator temperature of the rear air conditioning unit is calculated based on the optimum correction gain and the room temperature on the rear side from the rear room temperature sensor, and the air mix door of the rear air conditioning unit is controlled based on the calculated evaporator temperature. . Therefore, even when the compressor is in the on mode in the outside air introduction state when the outside air is low, there is no problem such as an increase in the blowout temperature of the rear air conditioning unit, and the optimum blowout temperature can be provided from the rear air conditioning unit.

[0008]

FIG. 2 is a block diagram showing an embodiment of the present invention.

In FIG. 2, 1 is a front air conditioning unit provided on the front side of the vehicle, 2 is a rear air conditioning unit provided on the rear side of the vehicle, and 3 is a front air conditioning unit 1 and a rear air conditioning unit 2. It is a control unit for controlling.

In the front air conditioning unit 1, 4 is a duct, inside which a blower 5, an evaporator 6 and a heater core 7 are arranged. The blower 5 is designed so that the control unit 3 controls the air volume. The evaporator 6 and the heater core 7 are blowers 5.
An air mix door 8 for adjusting the mixing ratio of cold air and warm air is provided between them. The opening degree of the air mix door 8 is controlled via an actuator 9 under the control of the control unit 3. An intake door 10 for selecting the introduction of the inside / outside air is provided at the uppermost stream of the duct 4, and the introduction selection control of the inside / outside air is performed via an actuator 11 under the control of the control unit 3. Has become. At the most downstream of the duct 4, a mode door 12 for controlling vent blowing and differential blowing and a mode door 13 for controlling heat blowing are provided, and an actuator 14 under the control of the control unit 3 is used. Then, the blowout mode is controlled.

In the rear air conditioning unit 2, reference numeral 15 is a duct in which a blower 16, an evaporator 17 and a heater core 18 are arranged. The blower 16 is designed so that the control unit 3 controls the air volume. Evaporator 17 and heater core 18
Is located downstream of the blower 16 and between them,
An air mix door 19 for adjusting the mixing ratio of cold air and warm air is provided. The opening degree of the air mix door 19 is controlled via an actuator 20 under the control of the control unit 3. The uppermost air intake port of the duct 15 is only on the inside air side, and only the inside air is introduced by the blower 16. A mode door 21 for controlling vent blowing and differential blowing is provided at the most downstream side of the duct 15, and the blowing mode is controlled via an actuator 22 under the control of the control unit 3. Has become.

Reference numeral 23 is a compressor shared by the front side air conditioning unit 1 and the rear side air conditioning unit 2, and a magnet clutch 24 controlled by the control unit 3 turns on / off the coupling with an engine (not shown). There is. An outside air temperature sensor 25 gives the outside air temperature to the control unit 3. A solar radiation sensor 26 gives the amount of solar radiation to the control unit 3. 27
Is the room temperature sensor for the front, and the front air conditioning unit 1
The control unit 3 is supplied with the room temperature on the front side of the vehicle provided with. Reference numeral 28 denotes a front temperature setting device, which supplies the set temperature of the front air conditioning unit 1 to the control unit 3. 29 is a front air conditioner (A
/ C) switch to A / C the front air conditioning unit 1
An on / off signal indicating whether the mode is the on mode or the A / C off mode is given to the control unit 3. The compressor 23 is in an on mode in which its driving is permitted in the A / C on mode, and in an off mode in which its driving is prohibited in the A / C off mode. A rear room temperature sensor 30 provides the control unit 3 with the rear room temperature of the vehicle in which the rear air conditioning unit 2 is provided. Three
Reference numeral 1 denotes a rear temperature setting device, which supplies the set temperature of the rear air conditioning unit 2 to the control unit 3. 32 is a rear air conditioner (A / C) switch, which is used for the rear air conditioning unit 1
The control unit 3 is supplied with an on / off signal indicating whether to set the A / C on mode or the A / C off mode.

The control unit 3 has a built-in microcomputer 33, and the amount of heat load to be controlled to the set temperature in the front room based on the outside air temperature, the amount of solar radiation, the room temperature on the front side, and the set temperature on the front side. Is calculated and the front side air conditioning unit 1 is controlled based on this front side comprehensive signal, and the rear side room is controlled based on the outside air temperature, the amount of solar radiation, the room temperature on the rear side, and the set temperature on the rear side. Calculates a rear-side comprehensive signal representing the amount of heat load to be controlled to the set temperature, and controls the rear-side air conditioning unit 2 based on this rear-side comprehensive signal,
It has a well-known function. The control unit 3
Further, according to the flowchart described later, when the front air conditioning unit 1 is in the A / C on mode and the rear air conditioning unit 2 is in the A / C on mode, the compressor 23 is turned on within a predetermined time (for example, 1 minute). Time integrated value T _ON
And the off-time integrated value T _OFF are detected and calculated, and are optimal for the on-time integrated value T _ON and the off-time integrated value T _OFF based on the control rule and the membership function stored in the internal memory of the microcomputer 33. The correction gain K of the evaporator temperature of the rear air conditioning unit 2 is fuzzy inferred, and the evaporator temperature of the rear air conditioning unit 2 is calculated based on the fuzzy inferred correction gain K and the rear room temperature T _INR from the rear room temperature sensor 30. The air mix door 19 of the rear air conditioning unit 2 is calculated based on the calculated evaporator temperature T and the rear total signal.
It has a function to control.

FIG. 3 is a diagram showing control rules stored in the internal memory of the microcomputer 33. The on-time integrated value T _ON is divided into three fuzzy sets, S = small on-time integrated value, M = on-on integrated value, L = large on-time integrated value, and off-time integrated value T _OFF is S = It is divided into three fuzzy sets: small off-time integrated value, M = medium off-time integrated value, L = large off-time integrated value, and fuzzy sets of on-time integrated value T _ON and off-time integrated value T _OFF intersect. Where S = small correction gain, M = medium correction gain,
The correction gain K of the evaporator temperature of the rear air conditioning unit 2 is set by three fuzzy sets of L = large correction gain. The control rule is a 2-input 1-output IF-THEN rule in which the on-time integrated value T _ON and the off-time integrated value T _OFF are antecedent variables and the correction gain K is an antecedent variable. In this example, three rules are used. And has a linguistic expression, it is expressed as follows. Rule 1: ON time integrated value T _ON is small and OFF time integrated value T
_{If OFF} is large, the correction gain K is increased. Rule 2: ON time integrated value T _ON is medium and OFF time integrated value T
If it is _OFF , set the correction gain K to medium. Rule 3: ON time integrated value T _ON is large and OFF time integrated value T
_{If OFF} is small, the correction gain K is made small.

FIGS. 4, 5 and 6 are views showing membership functions stored in the internal memory of the microcomputer 33. FIG. 4 shows members of the fuzzy sets S, M and L with respect to the on-time integrated value T _ON . FIG. 5 shows a membership function of the fuzzy sets S, M, L for the off-time integrated value T _OFF , and FIG. 6 shows a membership function of the fuzzy sets S, M, L for the correction gain K.

7 and 8 show the control unit 3
7 is a flowchart of the microcomputer 33 of FIG.
Shows the control processing of the air mix door 19 of the rear side air conditioning unit 2, and FIG. 8 shows the processing of step 42 in FIG. Hereinafter, the control process of the air mix door 19 of the rear air conditioning unit 2 in the configuration of FIG. 2 will be described with reference to FIGS. 7 and 8.

Now, the front A / C switch 29 and the rear A / C switch 32 are in the ON state, and both the front air conditioning unit 1 and the rear air conditioning unit 2 are A / C.
Assume that it is in on mode. In this state, the microcomputer 33 goes to step 42 through steps 40 and 41 of FIG. 7 and starts the process of FIG.

In the process of FIG. 8, first, at step 420, the on-time and off-time of the compressor 23 within a predetermined time are detected, at step 421 the on-time integrated value T _ON within the predetermined time is calculated, and at step 422. The off-time integrated value T _OFF within the predetermined time is calculated. The predetermined time is 1
Minutes. Next, in step 423, step 42
The suitability W _i (i = 1 to 3) of the antecedent part of each control rule with respect to the on-time integrated value T _ON and the off-time integrated value T _OFF obtained in 1 and 422 is calculated. That is, for each control rule, the membership value determined by the membership function of the fuzzy sets S to L for the on-time integrated value T _{ON and the} membership function of the fuzzy sets S to L for the off-time integrated value T _OFF are determined. By determining the membership value to be determined and selecting the minimum value of these membership values, the fitness W _{i of} each control rule is determined.
Ask for. For example, if the on-time integrated value T _ON is 25 seconds and the off-time integrated value T _OFF is 35 seconds, “the on-time integrated value T _ON is small (S) and the off-time integrated value T _OFF is large (L). if the correction gain K to the control rule 1 that "to large (L), the fitness membership function of the fuzzy set S is determined with respect to on-time integrated value T _oN 0.2, off-time integration The goodness of fit determined by the membership function of the fuzzy set L with respect to the value T _OFF is 0.8, and the minimum value of these is 0.2 is given as the goodness of fit of the control rule 1. Next, the conformity W _i of each control rule is reflected in the consequent part of the corresponding control rule, and the correction gain K _i (i = 1 to 3) of each control rule is calculated.
That is, by forming a trapezoidal wave function by cutting off the membership functions of the fuzzy sets S to L with respect to the correction gain K of the consequent part of the corresponding control rule at the height of the fitness W _i of each control rule, Control rule correction gain K
ask for _i . For example, taking the control rule 1 described above as an example, the membership function of the fuzzy set L with respect to the correction gain K is determined to have a goodness of fit o. The trapezoidal wave function obtained by cutting off at 2 is given as the correction gain of the control rule 1. Next, in step 425, based on the conformity W _i and the correction gain K _{i of} each control rule, step 42
The final correction gain K is calculated using the arithmetic expression described in 5. That is, the trapezoidal wave functions which are the inference results of the respective control rules obtained in step 424 are superposed and the center of gravity thereof is obtained to give the final correction gain K. Next, at step 426, the room temperature T _INR on the rear side is taken in from the room temperature sensor for rear 30, and then the next step 427.
Then, the correction gain K and the room temperature T _INR on the rear side are calculated by
By substituting T = 5 + K (T _INR -5),
Calculate the evaporator temperature T of the rear air conditioning unit 2,
Returning to step 43 of FIG.

In step 43 of FIG. 7, the evaporator temperature T calculated as the evaporator temperature of the rear side air conditioning unit 2 is set, and in the next step 44, the set evaporator temperature T and the rear side room are controlled to the set temperature. The opening degree of the air mix door 19 of the rear air conditioning unit 2 is calculated from the rear side comprehensive signal indicating the amount of heat load to be generated, and in the next step 45, the air of the rear air conditioning unit 2 is calculated according to the calculated opening degree. Control the mix door 19.

On the other hand, if the front A / C switch 29 and / or the rear A / C switch 32 are off and the front air conditioning unit 1 and / or the rear air conditioning unit 2 are in the A / C off mode, In FIG. 7, step 40 is entered from step 40 or 41, the rear room temperature T _INR is taken in from the rear room temperature sensor 30, and in the next step 47, the rear room temperature T _{INR is set} as the evaporator temperature of the rear air conditioning unit 2. Is set and step 44 is entered to control the opening degree of the air mix door 19 of the rear air conditioning unit 2 based on the room temperature T _INR on the rear side.

FIG. 9 is a diagram for explaining the control effect of the embodiment of FIG. 2, in which (a) is on / off of the compressor 23,
(B) is the evaporator temperature of the rear air conditioning unit 2,
(C) is the air mix door 19 of the rear air conditioning unit 2.
And (d) shows the blowing temperature of the rear air conditioning unit 2. When the off time of the compressor 23 becomes longer as shown in (a), when the conventional technique is applied, as shown by broken lines in (b), (c), and (d), the rear side air conditioning unit The evaporator temperature of 5 depends on the fixed resistance.
The temperature is recognized as ° C, and the air mix door of the rear side air conditioning unit is controlled based on it, so the blowout temperature of the rear side air conditioning unit rises. On the other hand, according to the above-described embodiment, as shown by the solid lines in (b), (c), and (d), when the off time of the compressor 23 becomes longer, the evaporator temperature of the rear air conditioning unit 2 is correspondingly increased. Becomes higher, the air mix door 19 of the rear side air conditioning unit 2 is controlled based on it, and the rise of the blowout temperature of the rear side air conditioning unit 2 is suppressed.

In the above embodiment, the evaporator temperature of the rear air conditioning unit 2 is calculated on the basis of fuzzy inference under the condition that both the front and rear air conditioning units are in the A / C on mode. The condition may be only the A / C on mode of the rear air conditioning unit.

[0023]

As described above, according to the present invention, the A / A that allows the rear air conditioning unit to drive the compressor
In the case of the C-on mode, the optimum correction gain of the evaporator temperature of the rear air conditioning unit is fuzzy inferred according to the integrated value of the on time and the integrated value of the off time of the compressor within the predetermined time, and the corrected gain and the room temperature for the rear are used. Since the evaporator temperature of the rear air conditioning unit is calculated based on the room temperature on the rear side from the sensor, and the air mix door of the rear air conditioning unit is controlled based on that, the outside air introduction state at low outside air, etc. Even when the compressor does not turn on despite the A / C on mode as in the case, there is no problem such as an increase in the outlet temperature of the rear air conditioning unit, and the optimal outlet temperature from the rear air conditioning unit does not occur. It is possible to provide a twin type vehicle air conditioner capable of providing the following.

[Brief description of drawings]

FIG. 1 is a block diagram of the present invention.

FIG. 2 is a configuration diagram showing an embodiment of the present invention.

3 is a diagram showing control rules stored in an internal memory of the microcomputer shown in FIG.

4 is a diagram showing a membership function stored in an internal memory of the microcomputer shown in FIG. 2, which is a fuzzy set membership function with respect to an on-time integrated value.

5 is a diagram showing a membership function stored in an internal memory of the microcomputer shown in FIG. 2, which is a fuzzy set membership function with respect to an off-time integrated value.

6 is a diagram showing membership functions stored in an internal memory of the microcomputer shown in FIG. 2, which is a membership function of a fuzzy set with respect to a correction gain of an evaporator temperature of a rear air conditioning unit.

7 is a flowchart of the microcomputer shown in FIG. 2, showing a control process of an air mix door of a rear air conditioning unit.

8 is a flowchart of the microcomputer of FIG. 2, showing the processing of step 42 in FIG.

FIG. 9 is a diagram for explaining the control effect of the embodiment of FIG.

[Explanation of symbols]

 1 Front Air Conditioning Unit 2 Rear Air Conditioning Unit 3 Control Unit 19 Rear Air Conditioning Unit Air Mix Door 23 Compressor 30 Rear Room Temperature Sensor 33 Microcomputer

Claims (1)

[Claims] 1. A twin-type vehicle air conditioner having a front air conditioning unit provided on a front side of a vehicle and a rear air conditioning unit provided on a rear side of the vehicle, wherein the rear air conditioning unit allows driving of a compressor. ON / OFF time calculating means for detecting the ON time and OFF time of the compressor and calculating the ON time integrated value and OFF time integrated value of the compressor within the predetermined time in the A / C ON mode. Control rules that use the on-time integrated value and off-time integrated value of the compressor in the above as the antecedent variable and the correction gain of the evaporator temperature of the rear air conditioning unit as the antecedent variable, and the on-time integrated value and the off Memorize fuzzy set membership functions for time integration value and correction gain A memory means, and an on-time integrated value and an off-time integrated value which are input in response to the compressor on-time integrated value and off-time integrated value from the on / off-time calculating means, and the control rule and membership of the memory means. Fuzzy inference calculation means for fuzzy inferring an optimum correction gain for the input integrated value of on-time and integrated value of off-time based on a function, and detecting the room temperature on the rear side where the rear air conditioning unit is provided A rear room temperature sensor, which is responsive to the fuzzy inference calculation means and the rear room temperature sensor, and is based on the correction gain obtained by the fuzzy inference calculation means and the rear side room temperature detected by the rear room temperature sensor. Rear evaporator temperature calculating means for calculating the evaporator temperature of the rear side air conditioning unit, and In response to the rear evaporator temperature calculation means, the rear air conditioning unit permits the driving of the compressor A / C
A twin type vehicle air conditioner having: an air mix door control means for controlling an air mix door of the rear side air conditioning unit based on the evaporator temperature calculated by the rear evaporator temperature calculation means in the ON mode.