JPH0648152A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To prevent uncomfortableness during low blowoff temperature at the time of low cooling water temperature compatible with the efficient rise of cooling water temperature by determining the blowoff air quantity of a blower by fuzzy inference on the basis of the difference between the target blowoff air temperature and the actual blowoff air temperature, and the body sensory index value. CONSTITUTION:An air conditioner for a vehicle is provided with a first computing means for computing the target temperature of blowoff air to be supplied to the vehicle interior, and an output means 51 for outputting data indicating the actual blowoff air being supplied to the vehicle interior. In response to the output means 51 and first computing means, a second computing means 54 computes the deviation value DELTATeq of the actual temperature from the target temperature, and a third computing means 53 computes the body sensory index value Tf. On the basis of the deviation value DELTATeq and body sensory index value Tf, a fuzzy inference means 55 draws a fuzzy inference from the air quantity of a blower. The control of body sensory temperature is thereby realized to raise the temperature of a heating heat exchanger efficiently without making an occupant feel uncomfortable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner.

[0002]

2. Description of the Related Art In a vehicle air-conditioning system, heat generated from an internal combustion engine is usually used as a heating source for the vehicle.
For example, when the temperature of the internal combustion engine is low, such as immediately after the engine is started, the air taken into the air conditioner cannot be sufficiently warmed up, and as a result, cold air is sent into the passenger compartment from the air outlet. In order to solve this kind of problem, for example, an outlet temperature sensor is arranged downstream of the heater core in which the cooling water of the internal combustion engine is circulated, and when the outlet temperature from the heater core is below a predetermined level, air is supplied to the heater core. A configuration is known in which the rotation speed of a blower motor for sending in is suppressed to a low level, thereby preventing a large amount of air that has not been sufficiently warmed up from being discharged into the passenger compartment (actually disclosed in Japanese Utility Model Publication No. 58- 87610).

[0003]

According to the above-mentioned prior art, it is possible to prevent an occupant from feeling uncomfortable when the temperature of the internal combustion engine is low enough before the temperature of the engine is sufficiently high. Has a problem that it is difficult to efficiently raise the cooling water temperature of the internal combustion engine because the rotation speed of the blower is reduced only by whether or not the temperature exceeds a predetermined level. ing. Therefore, an object of the present invention is to provide an improved vehicular air conditioner capable of achieving both the prevention of discomfort at the time of a low cooling water temperature and a low blowout temperature and the efficient increase of the cooling water temperature.

[0004]

The features of the present invention for solving the above-mentioned problems include a heat exchanger for heating using cooling water of an internal combustion engine, and intake air passing through the heat exchanger for heating. In a vehicular air-conditioning system including a blower for blowing air into a vehicle, first calculation means for calculating a target temperature of the air blown into the vehicle interior and an actual temperature of the air blown into the vehicle interior are shown. Output means for outputting data, second calculation means for calculating the deviation value of the actual temperature from the target temperature in response to the output means and the first calculation means, and third calculation means for calculating the feeling index value , And fuzzy inference means for fuzzy inferring the air volume of the blower based on the deviation value and the sensation index value.

[0005]

Function: In addition to the deviation value of the actual temperature from the target temperature, the air flow rate of the blower is determined by fuzzy reasoning, taking into consideration the feeling index. As a result, the sensible temperature is controlled, and the temperature of the heating exchanger can be efficiently increased without causing the occupant to feel discomfort.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 2 shows an embodiment of a vehicle air conditioner according to the present invention, in which reference numeral 1 is a ventilation duct, and an intake door 2 for adjusting an intake amount of air from inside and outside the vehicle is provided at an inlet end thereof. The intake door 2 is provided and is operated by a motor 35. 4 is a blower rotated by a blower motor 3, 5 is a cooling unit, 6 is a heater core, 7 is an air mix door which functions as a temperature adjusting member for adjusting the temperature of the air blown from the ventilation duct 1, and the air mix door 7 The positioning operation is performed by the door motor 8. At the exit end of the ventilation duct 1, a diff door 9, a vent door 10, and a foot door 11 are provided to determine the blowing direction of the blown air.
Is provided, and the door operation for setting the blowout mode is executed by the motor 36 connected to these doors 9, 10, 11.

In this structure, a control unit generally designated by the reference numeral 20 is provided for the purpose of controlling the blower 4 and the air mix door 7 so that the temperature inside the passenger compartment reaches and is maintained at a desired temperature. It is provided.

In the control unit 20, 21 is a setting device for outputting a setting signal SA indicating a set temperature (Tset) which is a desired desired vehicle interior temperature, and 22 is a room temperature Tr in the vehicle interior.
Is detected and an room temperature sensor SB that outputs the detection result is output, 23 is an outside air temperature sensor that detects the outside air temperature Ta and outputs an outside air temperature signal SC that indicates the detection result, and 24 is an insolation Q A solar radiation sensor that outputs a solar radiation signal SD indicating the detection result.

These signals SA to SD are converted into corresponding digital data DA, DB, DC, DD in an analog-digital converter (A / D) 25,
It is input to the microcomputer 26.

The microcomputer 26 includes a central processing unit (CPU) 27 and a read only memory (ROM) 28.
And a random access memory (RAM) 29. The ROM 28 stores a control program for temperature control by fuzzy inference, data regarding a membership function to be described later, and the like. .

In order to detect the temperature of the blown air, the apparatus of this embodiment has a first sensor 30 provided near the vent door 10 and a second sensor 31 provided near the foot door 11 as temperature sensors. ing. A vent temperature signal SE indicating the vent outlet temperature (Tv) from the first sensor 30.
Is output, and the heat outlet temperature (T
The heat temperature signal SF indicating h) is output. These temperature signals SE and SF are analog-digital converters (A
/ D) 32 respectively converts the digitalized vent temperature data DE and the digitized vent temperature data DF to the microcomputer 26.

Reference numeral 37 denotes a position sensor for detecting the position of the air mix door 7. The door position signal SG indicating the position of the air mix door 7 output from the position sensor 37 is an analog-digital signal. Converter (A
/ D) 32 converts it into a digital format and the door position data DG obtained as a result is input to the microcomputer 26.

A first control signal S1 for controlling a blower, a second control signal S2 for controlling an air mix door, and a second control signal S2 for controlling an intake door, which are obtained by executing a control program described later based on the input data DA to DG. A third control signal S3 and a fourth control signal S4 for controlling each door for determining the blowing mode are output from the microcomputer 26, and these control signals S1 to S4 are
First drive circuit 33, second drive circuit 34, third drive circuit 3
8 and the fourth drive circuit 39, respectively.

As a result, the first drive circuit 33 outputs the first
A blower drive signal K1 necessary for obtaining the air volume according to the control signal S1 is output, and the blower motor 3 is driven according to the blower drive signal K1. From the second drive circuit 34, the door drive signal K2 required to obtain the operation amount of the air mix door 7 according to the second control signal S2, that is, the opening degree.
Is output, and the positioning operation of the air mix door 7 by the door motor 8 is performed according to the door drive signal K. From the third drive circuit 38, a door drive signal K necessary to obtain the opening degree of the intake door 2 according to the third control signal.
3 is output, and the motor 35 operates in response to this.
The fourth drive circuit 39 outputs a door drive signal K necessary to obtain the blowout mode according to the fourth control signal, and the motor 36 operates in response to this so that the required blowout mode at that time is obtained. The doors 9, 10, 11 are operated.

FIG. 1 is a block diagram showing a control function for air conditioning by the microcomputer 26, which is achieved by executing a control program for temperature control stored in the ROM 28.

In FIG. 1, reference numeral 51 is an actual outlet temperature calculation unit for outputting the actual outlet temperature data DH indicating the actual outlet temperature Tair based on the vent temperature data DE and the heat temperature data DF, and 52 is the first and fourth control signals. In response to S1 and S4, the wind velocity calculation unit calculates the wind velocity Va at the outlet from the air volume of the blower 4 and the blowout mode at that time, and outputs the wind velocity data DI indicating the result.

The equivalent temperature calculator 53 calculates the average radiation temperature Trad and the equivalent temperature Teq based on the average radiation temperature Trad in response to the digital data DB, DC, DD, the actual blowout temperature data DH, and the wind speed data DI. Explaining this in a little more detail, first, the calculation of the vehicle body wall temperature Tb is calculated based on the following equation (1). Here, α, β, γ, M are coefficients, and C is a constant. The average radiation temperature Trad is the wall temperature Tb obtained by the equation (1).
Is calculated by using Trad = A1 · Tb + A2 · Q (2). Here, A1 and A2 are coefficients.

Thereafter, the equivalent temperature Teq is calculated according to the following equation (3).

[0019] The index data DS indicating the value of the sensation index Tf is given from the equivalent temperature calculation unit 53 to the fuzzy inference calculation unit 55.

Equivalent temperature data DJ indicating the equivalent temperature Teq
Is input to the addition unit 54 to which the data DA is input, and the data DJ and DA are added with the polarities shown. The deviation data JK indicating the deviation value ΔTeq obtained as a result of this addition is given to the fuzzy inference calculation section 55 as it is, and is finely calculated by the differential calculation section (d / dt) 56. It is input to the fuzzy inference operation unit 55.

In addition to this, the fuzzy inference operation section 55
The actual outlet temperature data DH and the radiation temperature data DM output from the equivalent temperature calculation unit 53 and indicating the average radiation temperature Trad
Has been entered. Then, ΔTe defined as shown in FIGS. The following grades (1) to (9) and (11) to (31) for the target outlet air temperature Tat of the outlet air and the target wind velocity Vat are calculated.

[0022]

[0023]

Here, NL is large in the negative direction, NS is small in the negative direction, ZO is zero, PS is small in the positive direction, and PL.
Is a fuzzy reasoning that means large in the positive direction.

[0025] The grade is calculated for each unit, and using this result, the target outlet air temperature Tat is calculated according to the fuzzy function shown in FIGS.
And the target wind speed Vat is inferred.

The fuzzy inference executed by the fuzzy inference operation section 55 may be executed by using a dedicated fuzzy operation chip.

Returning to FIG. 1, the target blown air temperature data DN indicating the target blown air temperature Tat is added to the actual blown air temperature data DH in the adding section 57 with the polarity shown in the figure, and the resulting temperature deviation data DO is obtained. Is the PI control calculation unit 58
Has been entered in. In the PI control calculation unit 58, the data DO
Is subjected to PI calculation processing, and its output is input as target air mix door position data DP to an adder 59 to which data DG indicating the actual air mix door position is input, and both are added with the polarities shown in the drawing. , The second control signal S
2 is output.

The target wind speed data DQ indicating the target wind speed Vat obtained by the inference at that time is output from the fuzzy inference operation unit 55, and both data DQ and DI are input in the addition unit 60 to which the data DI is input. Are added with the polarities shown. Wind speed deviation data DR obtained as a result
Is input to the air volume calculation unit 61, and the first control signal S1 is output according to the air volume deviation data DR.

The intake opening calculation unit 62 and the mode calculation unit 63 are responsive to the data DN, respectively, and the third control signal S
The third and fourth control signals S4 are output.

According to this configuration, the target blown air temperature Ta
difference between t and actual blown air temperature Tair and sensation index Tf
Based on the value of, the blower's blown air volume is determined by fuzzy reasoning, so the blown air volume should be controlled in harmony with the prevention of unpleasant sensation of low blowout temperature and efficient increase of cooling water temperature and vehicle room temperature. You can Therefore, in a situation where the engine cooling water is not sufficiently warmed, such as when the engine is started, it is possible to control the blower air volume very effectively. As a result, an extremely comfortable air conditioning is realized as compared with the conventional control of this type. In addition, low water temperature and hot air can be removed in the same manner.

FIG. 10 shows the ROM of FIG.
28 is a flowchart showing a control program stored in 28. Explaining this control program, when the control program starts to be executed in response to the power supply of the device being turned on, first, in step 71, the conversion data from the analog-digital converters 25 and 32 is fetched. In step 72, the wind speed Va of the blown air at that time is calculated. This calculation corresponds to the wind speed calculation in the wind speed calculation unit 52 shown in FIG.
It is executed by the map calculation shown in the characteristic diagram of FIG.

As can be seen from FIG. 11, the vent mode (V
For each of ENT), foot mode (FOOT), and bi-level mode (BI-L), the relationship between the applied voltage (V) to the blower motor 3 and the wind speed Va (m / sec) at that time was preliminarily tested. It is obtained in advance and stored in the ROM 28 in advance as table map data showing each relationship between the two obtained, and the blowout wind speed is obtained by map calculation from the blowout mode and the voltage applied to the blower motor 3 at that time. There is. As described above, the wind speed may be directly measured by an appropriate means.

Returning to FIG. 10, in the next step 73, the equivalent temperature Teq is calculated. The calculation of the equivalent temperature Teq is
This is executed by the equivalent temperature calculation routine shown in FIG. That is, in step 31, the vehicle body wall temperature T according to the equation (1) is calculated.
b is calculated, and in the next step 32, the average radiation temperature Trad according to the equation (2) is calculated. And step 3
At 3, the equivalent temperature Teq is calculated according to the equation (3), and the data DJ is obtained.

Returning to FIG. 10 again, in step 74,
The operation for fuzzy inference is executed as described with respect to the fuzzy inference operation section 55, and thereby the target blown air temperature Tat and the target wind speed Vat are inferred. Figure 1
The fuzzy inference operation of 0 will be described with reference to the detailed flowchart of the fuzzy inference routine shown in FIG. 13. In step 741, ΔTrq is calculated from the data DA and DJ, and in step 742. In step 744, the grade is calculated for each rule. The membership function shown in FIGS. 3 to 7 is used for the calculation of this grade. In step 745, the output amount is calculated according to the output membership function shown in FIG. 8 and FIG. 9, and in step 746, the center of gravity is calculated for each output, whereby the values of Tat and Vat are inferred.

Returning to FIG. 10, thereafter, the mix door control step 75 for controlling the opening of the air mix door 7, the blower control step 76 for controlling the blower motor 8 for controlling the blown air volume, and the blowout mode. Mode control step 7 for controlling the motor 36 for controlling
7, and an intake control step 78 for controlling the motor 35 for controlling the opening degree of the intake door 2 is executed, and the process returns to step 71.

[0036]

According to the present invention, as described above, the amount of blown air by the blower is determined by fuzzy reasoning based on the difference between the target blown air temperature and the actual blown air temperature and the sensation index value. In a situation where the engine cooling water is not sufficiently warmed, such as when the engine is started, the blower air volume can be controlled very effectively, the discomfort of low blowout temperature can be prevented, and the cooling water temperature and the vehicle room temperature can be efficiently raised. It is possible to appropriately control the blown air volume while achieving harmony with.

[Brief description of drawings]

FIG. 1 is a functional block diagram for explaining an operation for control executed by a microcomputer shown in FIG.

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

FIG. 3 is a diagram showing a membership function for fuzzy inference used for control.

FIG. 4 is a diagram showing a membership function for fuzzy inference used for control.

FIG. 5 is a diagram showing a membership function for fuzzy inference used for control.

FIG. 6 is a diagram showing a membership function for fuzzy inference used for control.

FIG. 7 is a diagram showing a membership function for fuzzy inference used for control.

FIG. 8 is a diagram showing an output membership function for fuzzy inference used for control.

FIG. 9 is a diagram showing an output membership function for fuzzy inference used for control.

10 is a flowchart showing a control program executed by the microcomputer shown in FIG.

11 is a graph for explaining map data used for calculating a wind speed in the microcomputer of FIG.

FIG. 12 is a detailed flowchart of the equivalent temperature calculation routine of FIG.

FIG. 13 is a detailed flowchart of the fuzzy inference routine of FIG.

[Explanation of symbols]

 7 Air Mix Door 8 Door Motor 20 Control Unit 21 Setter 22 Inside Air Temperature Sensor 23 Outside Air Temperature Sensor 24 Solar Radiation Sensor 26 Microcomputer 51 Actual Outlet Temperature Calculation Unit 52 Wind Speed Calculation Unit 53 Equivalent Temperature Calculation Unit 55 Fuzzy Inference Calculation Unit

Claims (1)

[Claims] 1. A vehicle air conditioner comprising a heating heat exchanger utilizing cooling water of an internal combustion engine and a blower for sending intake air through the heating heat exchanger into a vehicle compartment. First calculating means for calculating a target temperature of the blown air to be supplied to the room, output means for outputting data indicating the actual temperature of the blown air supplied to the vehicle compartment, the output means and the first calculating means. In response to the second temperature calculating means for calculating the deviation value of the actual temperature from the target temperature, the third calculating means for calculating the feeling index value, and the air volume of the blower based on the deviation value and the feeling index value. A vehicle air conditioner comprising: a fuzzy inference means for performing a fuzzy inference.