JPH06127255A - Vehicle air-conditioner - Google Patents

Abstract

PURPOSE:To realize an appropriate air-conditioning control for the change in every solar radiation condition. CONSTITUTION:The time constant T of the air-conditioning output control according to the change in the solar radiation is fuzzy-inferred by setting the change in the solar radiation SPN, the speed of the change in the solar radiation SPD, and the frequency of the change in the solar radiation FRQ as the input variables, (steps 208, 209, 210), the detected value TS of the solar radiation sensor is treated in the delayed manner by using the time constant T, and the controlling solar radiation TSC is calculated thereby.

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 for adjusting an air conditioning output (blowout temperature, blown air volume, etc.) into a vehicle in accordance with control conditions including solar radiation.

[0002]

2. Description of the Related Art Conventionally, in a vehicle air conditioner, in-vehicle air conditioning is performed with the amount of solar radiation as one of control conditions. In this case, a photoelectric conversion element is often used as a sensor for detecting the amount of solar radiation, but the photoelectric conversion element has an excessively high response speed, and thus the air conditioning output may unnecessarily change.

Therefore, in the conventional device, the output of the solar radiation sensor is delayed with a predetermined time constant, and as a result, the change in the amount of solar radiation is made gentler than the actual change, and the air conditioning output is made based on the signal. It is controlled (see Japanese Patent Publication No. 58-19484). Further, a time constant of the delay process (for example, a correction gradient when the amount of solar radiation rises and falls) is also changed according to the amount of variation of solar radiation (see Japanese Patent Laid-Open No. 63-170115).

[0004]

By the way, in addition to the amount of change in solar radiation, the rate of change and the frequency of change can be considered as factors that actually change the amount of solar radiation. Moreover, in reality, it can be said that these are intricately intertwined to create a condition.

However, in the conventional apparatus, only a part of them (mainly only the amount of change) is treated as a condition for calculating the degree of influence of solar radiation, and there is no problem under certain conditions, but even a little. There was a problem that proper air conditioning control would not be performed if the conditions were not met.

An object of the present invention is to provide a vehicle air conditioner capable of realizing appropriate air conditioning control with respect to any change in solar radiation conditions in consideration of the above circumstances.

[0007]

In order to achieve the above object, a vehicle air conditioner of the present invention, as shown in FIG. 1, includes a solar radiation sensor 1 for detecting the amount of solar radiation on a vehicle and an air conditioning output to the inside of the vehicle. A vehicle air conditioner having an air conditioning output adjusting means 2 for adjusting and an air conditioning controlling means 3 for controlling the air conditioning output adjusting means 2 in accordance with a control condition including an output of the solar radiation sensor 1. The solar radiation change amount calculation means 4 for calculating the solar radiation change amount SPN based on the output of the solar radiation, and the solar radiation change speed SPD based on the output of the solar radiation sensor 1.
The solar radiation change speed calculation means 5 for calculating the solar radiation change rate, the solar radiation change frequency calculation means 6 for calculating the solar radiation change frequency FRQ based on the output of the solar radiation sensor 1, and the respective outputs SPN, SPD of these calculation means 4, 5, 6. , FRQ as input variables, the fuzzy inference means 7 for fuzzy inference of the time constant T of air conditioning output control according to solar radiation changes, and the time constant T of the control circuit between the solar radiation sensor 1 and the air conditioning output adjusting means 2 are described above. Time constant setting means 8 for setting the value inferred by the fuzzy inference means 7.
And is provided.

[0008]

In the air conditioner of the present invention, the fuzzy inference means 7
, But infers the time constant T of the wind distribution control according to the change in the solar radiation direction based on the amount of solar radiation change SPN, the rate of solar radiation change SPD, and the frequency of solar radiation change FRQ. That is, in this case, the antecedent parameter (input) of the fuzzy inference is "solar radiation change amount SPN", "solar radiation change speed SPD" and "solar radiation change frequency FRQ",
The consequent part parameter (output) is the time constant T.

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 (the antecedent part) to THEN (the consequent part), from the input side membership function given in advance, the parameter of the antecedent part of the “insolation change amount SPN” Obtain the grade (also called the degree of belonging to the fuzzy label, the degree of conformity, or the membership value). Next, similarly, the other two parameters, "solar radiation change speed SPD" and "solar radiation change frequency FRQ".
Obtain each grade and take the minimum value of all grades.
This process is called antecedent process. Next, as a consequent part process, the output-side membership function is truncated at the grade (that is, a limit is added), and the trapezoidal output obtained by the trimming is ORed. Next, the center of gravity of the trapezoidal portions which are logically summed and superposed is obtained, and the position of the center of gravity is set as the inference result, that is, the "time constant T" which is the final output.

Then, with the inferred time constant T, for example, the detected solar radiation amount signal is subjected to a first-order delay (first-order delay) by a digital filter, and the air-conditioning output control amount is calculated based on the solar radiation signal obtained by the delay processing. The calculation or correction is performed, and the air conditioning output, that is, the blowout temperature, the blown air volume, or the like is controlled by the value obtained by the calculation or the correction.

The above delay processing may be performed before inputting the solar radiation amount signal to the air conditioning control means 3, or may be performed when various signal processing is performed in the air conditioning control means 3.

[0012]

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, a blower blower (air conditioning output adjusting means) 18, an evaporator 19, an air mix door (air conditioning output adjusting means) 20, and a heater 21 are arranged in this order from the upstream side to the downstream side. Is provided. Then, by controlling the opening degree (position) of the air mix door 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 that 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 setting device 33, the solar radiation sensor 34, the duct sensor (the air temperature immediately after passing through the evaporator, that is, the sensor that detects the actual temperature of the evaporator) 35, the air mix door 20, the blower fan 18,
The intake door 11 and the mode doors 14a and 14b are driven and controlled, and the temperatures of the evaporator 19 and the heater 21 are also controlled. Therefore, here, means from the control unit 30 to the air-conditioning equipment such as the air mix door 20 and the blower fan 18 constitutes the air-conditioning control means 3 shown in FIG.

Next, an example of control operation of the microcomputer in the control unit 30 will be described.

The microcomputer repeatedly executes the air conditioning main routine shown in FIG. 3 at a constant cycle (for example, a short cycle within 1 second). When the processing of this main routine is started, it is determined in step 101 whether or not it is the first processing after operating the ignition switch. In the case of the first processing, initial setting is performed in step 102, and step 102 is performed from the second processing. Pass and proceed to step 103.

In step 103, the amount of solar radiation is calculated from the signal from the solar radiation sensor 34, and a predetermined delay process is performed to obtain a corrected amount of solar radiation used for air conditioning control. This step 1
Details of 03 will be described with reference to FIG.

When the routine for calculating the amount of solar radiation correction shown in FIG. 4 is started, the signal from the solar radiation sensor is input in step 201, and the amount of solar radiation Ts is calculated in step 202. Next, it is determined whether or not it is the first process after operating the ignition switch, and if it is the first process, the process proceeds to step 204, and the previously calculated value of the solar radiation amount Ts is used as it is for the calculation of the air conditioning control. Set as the initial value of Tsc.

On the other hand, if it is not the first processing, the determination in step 203 becomes NO and steps 205, 20
In step 6 and 207, the solar radiation amount change frequency FRQ, the solar radiation amount change speed SPD, and the solar radiation amount change amount SPN are calculated.

Solar radiation change frequency FRQ, change speed SPD,
After the change amount SPN is calculated, the process proceeds to steps 208 to 210 to fuzzy infer the control time constant T of the air conditioning control according to the change in solar radiation using the calculation results as input parameters.

In this fuzzy reasoning, thirteen fuzzy rules as shown in the table of FIG. 5 are set according to the experience obtained from experience or experiments. Further, for each of the parameters SPD, FRQ, SPN, and the time constant T, membership functions shown in (a) to (d) of FIG. 6 are given. Here, each code (fuzzy label) is used in the following meaning.

PL: Large in the positive direction PM: Medium in the positive direction PS: Small in the positive direction ZR: Zero NS: Small in the negative direction NM: Medium in the negative direction NL: Large in the negative direction

In the fuzzy inference process, the time constant T is calculated using the MIN-MAX rule known from Japanese Patent Laid-Open No. 2-92763 according to the above fuzzy rule.
The flow is as follows. First, in step 208, the antecedent parameter SP is calculated by the input side membership function for each rule.
The grades Wi of D, FRQ, and SPN are obtained, and the minimum value is taken. Next, at step 209, the time constant Ti which is the consequent part output is obtained from the output side membership function for each grade of each rule. Then, in step 210, the output of the consequent part obtained for each rule is ORed to obtain the center of gravity, and the position of the center of gravity is set as the final time constant T.

When the time constant T is inferred, the solar radiation amount Ts is delayed by using the time constant T to calculate the control solar radiation amount Tsc. As an arithmetic expression in that case, for example, the following expression (1)
The first-order lag digital filter equation is used, and the value fuzzy inferred in step 210 is used as the value of the time constant T.

Yn = (1-Tsp / T) * Yn-1 + (Tsp / T) * Xn (1)

However, Yn: value after the current filter calculation processing Yn-1: value after the previous filter calculation processing Xn: value before the current filter calculation processing Tsp: sampling period T: time constant Is.

That is, the time constant T corresponds to the slope of the rising and falling signals of the solar radiation signal. In addition,
The delay processing method may be a delay using a timer without separately using the above digital filter arithmetic expression, and the time constant T obtained by the fuzzy calculation is used as the time constant in that case.

After the control solar radiation amount Tsc is calculated in this way, the process returns to the main routine of FIG. 3 and proceeds to step 104. Then, in this step 104, the detection signals of the respective sensors (the detection signal Tro of the vehicle interior temperature sensor 31, the detection signal Ta of the outside air temperature sensor 32, the set temperature signal Tset from the temperature setter 33), and the control solar radiation amount Tsc are set. Based on this, the total signal T corresponding to the air conditioning heat load is calculated. Overall signal T
The arithmetic expression of is as follows, for example. However, K1, K
2 and K3 are coefficients.

T = (Tro-25) + K1 Tsc + K2 (T
a-25) -K3 (Tset-25)

After that, various air-conditioning output controls are executed in relation to the total signal T directly or indirectly. That is, in step 105, air mix door control is performed, in step 106 blower control is performed, in step 107 blowout mode control is performed, in step 108 intake door control is performed, and in step 10
In step 9, compressor control is performed, and in step 110, display control is performed.

By performing the control in this manner, an optimum state based on the experience of the designer can be obtained even with respect to any state change of solar radiation.

[0033]

As described above, according to the vehicle air conditioner of the present invention, the time constant of the delay process is fuzzy inferred and inferred based on the three conditions of the amount of change of solar radiation, the change speed, and the change frequency. Since the air conditioning control for the solar radiation change is performed based on the time constant, it is possible to realize the appropriate air conditioning control for any variation of the solar radiation conditions.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration 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 of a main routine of air conditioning control in the embodiment.

FIG. 4 is a flowchart showing details of step 103 in the flowchart of FIG.

5 shows steps 208 to 21 in the flowchart of FIG.
It is a figure which shows the rule used for the fuzzy inference of 0.

6A and 6B show membership functions used for the fuzzy inference, where FIG. 6A is a membership function of solar radiation change rate (SPD) which is an antecedent parameter, and FIG. 6B is a solar radiation change frequency which is an antecedent parameter ( FRQ) membership function, (c) is the amount of solar radiation change (S
(PN) is a membership function, and (d) is a diagram showing a membership function of a time constant T which is a consequent part parameter.

[Explanation of symbols]

 1,34 Solar radiation sensor 2 Air conditioning output control means 3 Air conditioning control means 4 Solar radiation change amount calculation means 5 Solar radiation change speed calculation means 6 Solar radiation change frequency calculation means 7 Fuzzy inference means 8 Time constant setting means 18 Blower blower (air conditioning output adjustment means) 20 Air mix door (air conditioning output control means) 30 Control unit

Front page continuation (72) Inventor Yoko Sasaki 3-1326 Yakuchocho, Higashimatsuyama City, Saitama Stock Company Zexel Higashimatsuyama Factory (72) Inventor Kyoichi Fujimori 3-1326 Yasuyuki Town, Higashimatsuyama City, Saitama Prefecture Ceremony Company Zexel Higashi Matsuyama Factory

Claims (1)

[Claims] 1. A solar radiation sensor for detecting a solar radiation amount to a vehicle, an air conditioning output adjusting means for adjusting an air conditioning output to the inside of the vehicle, and the air conditioning output adjusting means for controlling the air conditioning output adjusting means according to a control condition including an output of the solar radiation sensor. In a vehicle air conditioner having an air conditioning control means, a solar radiation change amount calculation means for calculating a variation amount of solar radiation based on the output of the solar radiation sensor, and a rate of change of solar radiation based on the output of the solar radiation sensor. The solar radiation change speed calculation means, the solar radiation change frequency calculation means for calculating the solar radiation change frequency based on the output of the solar radiation sensor, and the output of each of these calculation means as input variables when controlling the air conditioning output according to the solar radiation change. A fuzzy inference means for fuzzy inferring a constant and a time constant of a control circuit between the solar radiation sensor and the air conditioning output adjusting means are set to values inferred by the fuzzy inference means. Air conditioning system, characterized by comprising a constant setting means, when to.