JPH0648155A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To perform optimum temperature adjustment by providing a selecting part for selecting an operation pattern, corresponding to the content set by a manual setting means, out of plural operation patterns. CONSTITUTION:An operation pattern in the case of setting the fuzzy air quantity automatically, and an operation pattern in the case of switching a fan 18 off manually are prepared as operation patterns, and a selecting part is provided to select the fan-off time operation pattern at the time of switching the fan 18 off. In the case of switching the fan 18 off, the previously prepared fan-off time operation pattern is selected, and the control quantity of the remaining control equipment such as an air mixer 20 is computed on the basis of this operation pattern to control the remaining control equipment. The remaining control equipment 20 is thereby controlled appropriately so as to prevent the air mixing door 20 from going into a full hot position or the like even if the fan 18 is switched off in the intermediate stage, thus solving the problem of blowoff of hot air caused by travel air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a function of detecting a heat load in a vehicle and automatically controlling a control device in response to the load, and a part of the control device such as a fan or a compressor according to a request of an occupant. The present invention relates to a vehicle air conditioner that also has a function of manually setting.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 64-22617 discloses an automatic air conditioner system for controlling each control device based on a fuzzy inference result obtained by inputting a signal from an air conditioning sensor such as a vehicle interior temperature sensor or an outside air temperature sensor. It is shown.

On the other hand, a general vehicle air conditioner has an automatic function of detecting a heat load inside the vehicle and automatically controlling the control device in response to the heat load, and a part of the control device such as a fan or a compressor according to a passenger's request. It also has a manual function to manually set the operating state of.

[0004]

By the way, the automatic air conditioning operation is premised on the case where all the control devices are automatically controlled. For example, when only the fan is manually turned off, Since the room temperature is always lower than the set temperature, there is a problem that the air mix door goes to the full hot position, and hot air is blown into the vehicle due to traveling wind. When the compressor is manually turned off, the blowout temperature rises in the summer and the room temperature becomes higher than the set temperature, so the control instructs the cooling direction. However, since the outlet temperature cannot be lower than the outside air, we try to correct it by the air volume. Therefore, there is a problem that the fan blows up to HI (high air volume) and becomes stable. These problems similarly occur in the air conditioner described in the above publication.

In consideration of the above-mentioned circumstances, the present invention is also applicable to the case where a part of the control equipment is stopped or fixed by manual setting.
It is an object of the present invention to provide a vehicle air conditioner that realizes comfortable vehicle interior air conditioning by appropriately controlling the remaining control devices.

[0006]

As shown in FIG. 1, a vehicle air conditioner of the present invention includes a means 1 for detecting an air conditioning heat load in a vehicle, and a control equipment group 2 based on a signal from the means 1. Control amount calculating means 3 for calculating each control amount, control means 4 for controlling the operation or state of the control equipment group 2 based on the calculation result of the means 3, and a part of the control equipment group 2 or In a vehicle air conditioner including a manual setting unit 5 for manually setting the state prior to the control by the control unit 4, the control amount calculation unit 3 corresponds to the setting content of the manual setting unit 5. A plurality of calculation patterns 6 are provided, and a selection unit 7 for selecting a calculation pattern 6 among the plurality of calculation patterns 6 according to the setting content by the manual setting means 5 and the control amount by the selected calculation pattern 6. Calculate A calculation unit 8, and comprising the.

[0007]

In the vehicle air conditioner of the present invention, when a part of the control device group 2 is stopped or fixed by manual setting, the selecting section 7 selects the calculation pattern 6 according to the setting content. That is, the selection unit selects a calculation pattern that does not include the control device as a control target. Then, the control amounts of the remaining control devices are calculated based on the selected calculation pattern 6, and the control means 4 controls the remaining control device group 2 so that the calculated control amounts are obtained. Thus, even if some control devices are manually set, the remaining control devices can be appropriately and automatically controlled.

For example, as the calculation pattern, a calculation pattern for automatically setting the fan airflow and a calculation pattern for manually turning off the fan are prepared, and when the fan is off, the calculation pattern when the fan is off is selected. Configured to do so. Then, when the fan is turned off, the calculation pattern prepared when the fan is turned off is selected in advance, and the control amount of the remaining control device, such as the air mix door, is calculated based on the calculation pattern, and Control. As a result, the rest of the control equipment is properly controlled, and the fan is turned on during the interim period.
The air mix door does not go to the full hot position just because of FF, and the problem of hot air blowing due to running wind is solved.

As the calculation pattern, a calculation pattern for automatically setting the compressor capacity and a calculation pattern for manually turning off the compressor are prepared. When the compressor is off, the calculation pattern when the compressor is off is selected. Configured to do so. Then, when the compressor is turned off, a previously prepared calculation pattern when the compressor is turned off is selected, and the remaining control devices are selected based on the calculation pattern.
For example, the control amount of the fan is calculated and the device is controlled. As a result, the remaining control equipment (for example, the fan) is properly controlled, and the fan is not stabilized at HI in the summer.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a schematic diagram showing the overall configuration of the air conditioner of the embodiment. In this figure, reference numeral 10 is a ventilation duct, and an inside air intake 12 switched by an intake door 11 is provided at an upstream end of the ventilation duct 10.
An outside air intake 13 is provided, and a VENT outlet 15, a DEF outlet 16, and a FOOT outlet 17 that are switched by the outlet doors 14a and 14b are provided at the downstream end.

In the middle of the ventilation duct 10, the blower (control device) 1 is sequentially arranged from the upstream side to the downstream side.
8, an evaporator 19, an air mix door 20, and a heater 21 are provided. By controlling the opening (position) of the air mix door (control device) 20, the mixing ratio of cold air and warm air is adjusted to adjust the temperature of the air blown into the vehicle.

Reference numeral 22 is an intake door actuator, 23 is a compressor which constitutes a cooling system together with an evaporator, 24 is an air mix door actuator, 25 is a heater water valve, and 26 is a mode door actuator.

The actuators are controlled by the control unit 30. Control unit 3
Reference numeral 0 is mainly composed of a microcomputer, and has at least a vehicle interior temperature sensor 31 and an outside air temperature sensor 3
2. Based on the input information from the temperature setter 33 and the solar radiation sensor 34, the air mix door 20, the blower 18, the intake door 11, the mode doors 14a and 14b are driven and controlled, and the temperatures of the evaporator 19 and the heater 21 are further controlled. To do. Further, a fan switch (FAN SW) 35 (manual setting means) for manually setting the operation state of the blower 18 is connected to the control unit 30, and when the fan switch 35 is in the manual setting state, the control unit 30 Is the fan switch 35
The blower 18 is preferentially controlled in accordance with the instruction.

FIG. 3 shows the control contents of the air mix door 20 and the blower 18 in the air conditioning control performed by the control unit 30. When this control starts, first in step 101, the set temperature Ts set by the temperature setter 33 and the in-vehicle temperature Tr from the in-vehicle temperature sensor 31 are read. Next, at step 102, the temperature deviation E1 (=
Ts-Tr) is calculated. Next, at step 103, the time variation of the temperature deviation E, that is, the temperature deviation change rate E2 (=
Calculate d / dt · E1).

Then, step 104 and step 1
Check the state of the fan switch (FAN SW) with 05, and if the fan switch is auto (AUTO),
When the fan switch is OFF, the routine proceeds to step 108. When the fan switch is neither AUTO nor OFF, the routine proceeds to step 110.

If the processing proceeds to step 106, inference A is executed here. The inference A is for automatically controlling the blower, that is, when the operation of the blower is not manually limited. As the inference pattern (computation pattern), a corresponding pattern, that is, a pattern for automatically controlling the entire blower is prepared. There is.

Then, in accordance with the result of the inference in step 106, the blower voltage is controlled in step 107, and the opening of the air mix door is controlled in step 120. In this case, as an inference result, a change amount per unit time (air mix door opening change amount Δθ on the air mix door side, blower voltage change amount ΔV on the blower side) is output, and the change amount is output every hour according to the output. The control for adding the change amount to the current value is executed.

If the process proceeds to step 108, inference B is executed here. This inference B is for when the fan is off, and as the inference pattern, a pattern is prepared on the premise of air conditioning by running wind when the fan is off.

After the reasoning in step 108,
In step 109, the blower is turned off, and then in step 120, the opening of the air mix door is controlled according to the inference result.

If the process proceeds to step 110, inference C is executed here. This inference B is for the case where the blower is manually set (other than OFF), and a pattern corresponding to the manually set air volume is prepared as the inference pattern.

After the reasoning in step 110,
In step 109, the blower voltage is controlled according to the manual setting, then the process proceeds to step 120, and the opening degree of the air mix door is controlled according to the inference result.

When the processing of step 120 is completed, the process returns to the first step. Alternatively, when another control is performed, the process of a separately defined routine is performed.

Next, the details of the inference steps 106, 108 and 110 for the manipulated variables of the air mix door and the blower will be described with reference to the flow charts shown in FIGS.

First, the reasoning A in the case of the fan "AUTO"
The contents of will be explained. This inference A is based on the deviation E1 and the deviation change rate E2 between the set temperature Ts and the vehicle interior temperature Tr.
The change amount Δθ of the air mix door opening and the blower voltage change amount ΔV are both fuzzy inferred.

The fuzzy inference outputs an inference result according to a fuzzy rule determined based on an empirical rule or the like. The procedure of the method is as follows, for example. First, according to each fuzzy rule expressed in the form of IF (preceding part) to THEN (consequent part), the grade (fuzzy) of the parameter “E1” of the preceeding part is calculated from the input side membership function given in advance. Degree of belonging to the label,
Find the fitness or membership value). Then, similarly, another parameter, "E2"
Find the grade of, and take the minimum of all grades. This process is called antecedent process.

Next, as the consequent processing, the output side membership function is truncated at the grade (that is, a limitation is applied) at the place of the grade, and the trapezoidal output obtained by the truncated processing is ORed. To do. Then, the center of gravity of the trapezoidal portions that are logically summed and superposed is obtained, and the position of the center of gravity is used as the inference result, that is, the final output. The final output of the fuzzy inference in the air mix door control is the air mix door opening change amount Δθ. The final output of the fuzzy inference in the blower control is the blower voltage change amount ΔV.

In this inference A, the fuzzy rules shown in FIG. 6 and the fuzzy rules shown in FIG. 7 are given in advance. Further, the input side membership function shown in FIG. 8 and the output side membership function shown in FIG. 9 are given. These fuzzy rules and membership functions are
It was created on the premise of automatically controlling the fan (blower), and is not used when the fan is off.

The thirteen fuzzy rules in FIG. 6 are rules regarding the relationship between the temperature deviation E1 and the deviation change rate E1 and the air mix door opening change amount Δθ. The thirteen fuzzy rules in FIG. 7 are rules regarding the relationship between the temperature deviation E1 and the deviation change rate E1 and the blower voltage change amount ΔV. The membership function of FIG. 8 shows the membership function on the input side, (a) shows the membership function of the temperature deviation E1, and (b) shows the temperature deviation change rate E.
A membership function of 2 is shown. Further, the membership function of FIG. 9 shows the membership function on the output side,
(A) shows the membership function of the air mix door opening change amount, and (b) shows the membership function of the blower voltage change amount.

Here, each code (fuzzy label)
Is used in the following sense. PL ... Large in positive direction PM ... Medium in positive direction PS ... Small in positive direction ZR ... Zero NS ... Small in negative direction NM ... Medium in negative direction NL ... Large in negative direction

In the process of the inference A, M, which is known from Japanese Patent Laid-Open No. 2-92763, etc., according to the above fuzzy rule, is used.
Using the IN-MAX rule, the air mix door opening change amount Δθ and the blower voltage change amount ΔV are calculated. As shown in FIG. 4, first, at step 201, the grade Wi of the antecedent parameters E1 and E2 is obtained by the input side membership function for each rule, and the minimum value is taken. Next, at step 202, the output side membership function is used to determine the consequent output Δθi or ΔVi for each grade of each rule. And step 203
Then, the output of the consequent portion obtained for each rule is ORed to obtain the center of gravity, and the center of gravity position is set as the air mix door opening change amount Δθ and the blower voltage change amount ΔV.

Now, the case of E1 = + 5 ° C. and E2 = 0 will be specifically described. In this case, according to the membership function of E1 shown in FIG. 8A, the corresponding labels are PS and PM, and the grade is PS = 0.5, PM =
It is 0.5. Similarly, according to the membership function of E2 shown in (b), the corresponding label is ZR and the grade is ZR = 1. The minimum grade value for each rule is "0.5", and when the output side membership function shown in FIG. 9 is truncated to find the center of gravity of the union of the trapezoidal sets shown by the shaded areas, The mixed door opening change amount Δθ becomes “+3 (% / sec)” and the blower voltage change amount ΔV becomes “+0.5 (V / sec)”. Therefore, the air mix door opening may be adjusted by "+ 3%" per second. Further, the blower voltage may be changed by "+ 5V" per second.

Next, the content of the inference B when the fan is "OFF" will be described. This inference B is to fuzzy infer only the change amount Δθ of the air mix door opening based on the deviation E1 and the deviation change rate E2 between the set temperature Ts and the vehicle interior temperature Tr.

In this inference B, the fuzzy rules shown in FIG. 10 are given in advance. Further, the input side membership function shown in FIG. 11 and the output side membership function shown in FIG. 12 are given. These fuzzy rules and membership functions are created on the premise of air conditioning inside the vehicle by the running wind when the fan is off, and are not used except when the fan is off.

The thirteen fuzzy rules in FIG. 10 are rules regarding the relationship between the temperature deviation E1 and the deviation change rate E1 and the air mix door opening change amount Δθ. Also, FIG.
The membership function 1 indicates the membership function on the input side, (a) shows the membership function of the temperature deviation E1, and (b) shows the membership function of the temperature deviation change rate E2. Further, the membership function of FIG. 12 shows the membership function on the output side, that is, the membership function of the air mix door opening change amount Δθ.

In the process of the inference B, only the air mix door opening change amount Δθ is calculated according to the fuzzy rule of FIG. 10 and the membership function of FIGS.
The flow is as shown in FIG.
In 1, the grade Wi of the antecedent parameters E1 and E2 is obtained by the input side membership function for each rule, and the minimum value is taken. Next, at step 302, the consequent part output Δθi is obtained for each grade of each rule from the output side membership function. Then, in step 303, the consequent part output obtained for each rule is ORed to obtain the center of gravity, and the position of the center of gravity is set as the air mix door opening change amount Δθ.

Now, the case of E1 = + 5 ° C. and E2 = 0 will be specifically described. In this case, according to the membership function of E1 shown in FIG. 11A, the corresponding labels are PS and ZR, and the grades are PS and PS, respectively.
= 0.8 and ZR = 0.2. Similarly, FIG. 11 (b)
According to the membership function of E2 shown in, the corresponding label is ZR and the grade is ZR = 1. The minimum grade values for each rule are "0.8" and "0.
2 ", the output side membership function shown in FIG. 12 is truncated at the grade position to obtain the center of gravity of the union of the trapezoidal sets shown by the shaded areas, and the air mix door opening change amount Δθ becomes +0.4 (% / sec) ”. Therefore, the air mix door opening may be adjusted by a slight amount of “+ 0.4%” per second.

In this way, when the fan is off, the air mix door opening change amount Δθ is calculated in a calculation pattern that is valid only at that time, and the air mix door is controlled accordingly. Therefore, by creating a fuzzy rule or membership function that takes into consideration the situation when the fan is off (the situation where the air is blown out only by the running wind), the air mix door will reach the full hot position when the fan is off. The problem can be solved,
It is possible to realize comfortable air conditioning by running wind.

Next, the reasoning C when the fan is not "OFF" and the fan is not "AUTO" will be briefly described. For the inference C in this case, as in the case of the inference B, a fuzzy rule and a membership function corresponding to the manually set contents of the fan are created in advance and the inference is executed. By doing so, it is possible to calculate an appropriate control amount according to the contents of the manual setting, and it is possible to realize air conditioning control without inconvenience.

By the way, a conventional publication (Japanese Patent Laid-Open No. 64-226)
In the device of Japanese Patent No. 17), even when the fan is turned off or the air volume is Lo, the inference is executed in the same pattern as in the fan auto. That is, the reasoning A is executed regardless of the fan switch. Therefore, when the blower fan is stopped, as shown in FIG. 13, it is delayed that E1 and E2 become “0” due to the decrease in the air volume, and as a result, the air mix door opening change amount Δθ is successively increased. Is added, and finally it goes to full hot and hot wind blows out due to the running wind. However, in the case of the embodiment of the present invention, when the fan is turned off, the air mix door is controlled in a pattern in consideration of it, so that such an inconvenient fluctuation is suppressed and a stable door opening is achieved. The transition will be smooth. Therefore, the feeling of feeling can be improved.

In the above embodiment, the fan (blower) is taken as a part of the control device, but the compressor may be used. That is, the control amount of the control device is calculated in different patterns when the compressor is turned off and when it is not turned on.

Although it is theoretically possible to use the operating states of the manually set target devices as input parameters and create rules and membership functions incorporating them in advance to support them, the number of inputs is As the number of members increases, the membership function and the like become complicated, which causes practical difficulties. On the other hand, changing the calculation pattern according to the contents of the manual setting as in the present invention has a simpler configuration and can shorten the calculation time.

[0042]

As described above, according to the present invention,
Even when a part of the control device group is manually stopped or fixed, the optimum temperature adjustment can be performed by selecting the optimum calculation pattern for the situation.

[Brief description of drawings]

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

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

FIG. 3 is a flowchart showing an outline of air conditioning control in the same embodiment.

FIG. 4 is a flowchart showing details of step 106 in the flowchart of FIG.

5 is a flowchart showing details of step 108 or 110 in the flowchart of FIG.

6 is a diagram showing an inference rule of an air mix door opening change amount in inference A in step 106 of the flowchart of FIG.

7 is a diagram showing an inference rule of a blower voltage change amount in inference A in step 106 of the flowchart of FIG.

FIG. 8 shows an input-side membership function in the inference A, in which (a) is an input parameter E1 (= Ts-Tr).
And (b) is a diagram showing the membership function of the input parameter E2 (d / dt · E1).

9A and 9B show output-side membership functions in the inference A, FIG. 9A shows a membership function of an air mix door opening change amount Δθ, and FIG. 9B shows a membership function of a blower voltage change amount ΔV. FIG.

10 is a diagram showing an inference rule for an air mix door opening change amount Δθ in inference B in step 108 of the flowchart in FIG.

FIG. 11 shows a membership function on the input side in the inference B, where (a) is an input parameter E1 (= Ts−T).
r) is a diagram showing a membership function, and (b) is a diagram showing a membership function of an input parameter E2 (d / dt · E1).

FIG. 12 is a diagram showing a membership function of an air mix door opening change amount Δθ which is an output of a consequent part in the inference B.

FIG. 13 is a characteristic diagram shown for comparing the transition of the air mix door opening according to the embodiment of the present invention with the transition of the air mix door opening according to the conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat load detection means 2 Control equipment group 3 Control amount calculation means 4 Control means 5 Manual setting means 18 Blower (control equipment) 20 Air mix door (control equipment) 30 Control unit 31 Vehicle temperature sensor 33 Temperature setting device 35 Fan switch ( Manual setting means)

Claims (1)

[Claims] 1. A means for detecting an air conditioning heat load in a vehicle, a control amount calculation means for calculating each control amount of a control equipment group based on a signal from the means, and a control equipment based on a calculation result of the means. A vehicle air conditioner comprising: a control unit that controls the operation or state of a group; and a manual setting unit that manually sets a part of the operation or state of the control device group prior to the control by the control unit. The control amount calculation means has a plurality of calculation patterns corresponding to the contents set by the manual setting means, and a selection for selecting a calculation pattern according to the contents set by the manual setting means from among the plurality of calculation patterns. An air conditioner for a vehicle, comprising: a unit; and a calculation unit that calculates the control amount according to a selected calculation pattern.