JPH05278453A - Intake door control device for vehicular air conditioner - Google Patents

Abstract

PURPOSE:To provide an intake door control device which properly assumes switch-over control in response to an emission of odor. CONSTITUTION:A content of odor penetration W into a cabin is estimated through Fuzzy reasoning based on odor concentration L and a rate of change in odor concentration DELTAL (step 103, 104 and 105), it is judged whether or not outside air penetration prevention control is assumed based on a content of odor penetration W estimated through Fuzzy reasoning (step 106). And when it is judged that the aforesaid control shall be assumed, an intake door is switched over to a cabin air introduction position (step 107).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake door control device for an air conditioner for a vehicle, which controls the intake door in accordance with a value detected by an odor sensor.

[0002]

2. Description of the Related Art Conventionally, as a technique of this kind, Japanese Patent Laid-Open No.
The one described in Japanese Patent No. 185820 is known. In this technique, when the odor (gas) concentration exceeds a predetermined value by an odor sensor, the intake door is switched to the inside air circulation position.

[0003]

By the way, in the above-mentioned prior art, when the gas concentration (constant level) at which an occupant feels an offensive odor is exceeded, the internal air circulation is switched to. It was sometimes incomplete.

If the level at which the occupant feels an offensive odor is lowered, the responsiveness is improved and the effect of preventing odor intrusion increases, but then the intake door is switched over even for a slight odor that the occupant does not feel. There were times when it happened.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an intake control device capable of appropriately performing switching control according to the generation of odor.

[0006]

In order to solve the above-mentioned problems, the present invention, as shown in FIG. 1, controls the intake door 2 according to the detection value of the odor sensor 1 for the intake door of a vehicle air conditioner. In the apparatus, the odor concentration calculating means 3 for calculating the odor concentration L from the detection value of the odor sensor 1.
And the odor concentration change rate calculation means 4 for calculating the change rate ΔL of the odor concentration, and the intrusion odor amount fuzzy inference for fuzzy inference of the intruded odor amount W into the vehicle cabin based on the odor concentration L and the odor concentration change rate ΔL. Means 5, odor intrusion prevention control execution judging means 6 for deciding whether or not to execute odor invasion prevention control based on the inference result of the fuzzy inference means 5, and the means 6
When it is determined that the odor intrusion prevention control is to be executed, the intake door drive control means 7 for forcibly switching the intake door 2 to the inside air introduction position is provided.

[0007]

In the apparatus of the present invention, the fuzzy inference means 5 fuzzy infers the intruding odor amount W based on the odor concentration L and the concentration change rate ΔL. That is, in this case, the antecedent variable (input) of the fuzzy inference is the odor concentration L and the concentration change rate ΔL, and the consequent variable (output) is the intruding odor amount W. And
Based on the inferred intruding odor amount W, the odor intrusion prevention control execution determination means 6 determines whether or not to switch to the inside air introduction to prevent the inflow of odor into the vehicle, and when it is determined that it should be switched. The intake door drive control means 7 switches the intake door 2 to the inside air introduction position.

Fuzzy inference outputs an inference result in accordance with a fuzzy rule determined based on an empirical rule or the like. The procedure of the method is as follows, for example.

In the fuzzy calculation, first, according to each fuzzy rule, the odor concentration L and the odor concentration change rate Δ which are variables of the antecedent part are calculated by a membership function given in advance.
Each grade of L (also referred to as degree of belonging to fuzzy label or membership value) is obtained, and the minimum value of both grades is taken. This processing is called antecedent processing. Next, as the consequent part processing, the output side membership function is truncated at the above grade, and the trapezoidal output obtained by the trimming processing is ORed and the center of gravity of the superimposed trapezoidal parts is obtained. , And the position of its center of gravity is taken as the inference result, that is, the intruding odor amount W.

This inference method is disclosed, for example, in Japanese Patent Laid-Open No. 2-927.
This is an application of the method known in Japanese Patent No. 63, etc. As the inference method, another method may be adopted separately.

[0011]

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 configuration diagram of a vehicle air conditioner including the intake door control device of the embodiment. The odor sensor (gas sensor) 1 used in this embodiment outputs a signal according to the concentration of pollutant gas, and is installed in a place where the outside air often passes in the engine room.

The air-conditioning unit 11 constituting the mechanical part of the air-conditioning system has a tip at the outside air inlet 12a and an inside air inlet 12b.
It has a duct 12 which is branched to. In the duct 12, the intake door 2, the blower fan 14, the evaporator 15, and the evaporator 15 are arranged in this order from the upstream side to the downstream side.
An air mix door 16 and a heater core 17 are provided.

The intake door 2 has an actuator 18
Thus, at least the inside air introduction position (REC) and the outside air introduction position (FRESH) are selectively switched. The actuator 18 is controlled by the control unit 20. The control unit 20 is mainly composed of a microcomputer, and includes an odor sensor 1, an outside air temperature sensor 21, an inside air temperature sensor 22, a solar radiation sensor 23, a temperature setting device 24, a manual switch 25, etc. (others are omitted). The signal is read and a predetermined calculation is performed based on the read data. Then, based on the calculated contents, the intake door actuator 18, the blower fan 14, the air mix door 16 actuator,
In addition, it controls the operation of a compressor (not shown).

The opening position of the intake door 2 is usually determined by a total signal (a signal corresponding to the heat load inside the vehicle) calculated from the outside air temperature, the inside air temperature, the set temperature, and the amount of solar radiation. Here, determining the position of the intake door 2 based on these conditions for controlling the vehicle interior temperature and controlling the intake door 2 to that position is called "normal control". When performing the "normal control", if the degree of odor penetration into the vehicle exceeds a predetermined reference value, that is, if it is detected that the outside air is contaminated, the intake door 2 causes the "normal control" to occur. , And is preferentially controlled to the outside air introduction cutoff position (inside air introduction position = REC).

Next, an example of the air conditioning control performed by the control unit 20 will be described. Here, the overall description of the air conditioning control is omitted, and only the routine that controls the intake door 2 (see FIG. 2) according to the degree of contamination of the outside air will be described. The content of the routine is shown in FIG. 3, and the content of the control will be described in detail based on this.

In the apparatus of this embodiment, the microcomputer constituting the control unit 20 is
Predetermined air conditioning control is performed by executing a preset control program. The routine shown in FIG. 3 is defined as one subroutine in the main routine of air conditioning control, and is periodically executed in the order of millisec (msec) by turning on the ignition switch.

When the processing of the routine shown in FIG. 3 is started, the odor concentration L is input in the first step 101. As the value of the odor concentration L, the signal of the odor sensor 1 may be used directly, but the value after a predetermined process (for example, averaging process) may be used.

Next, the process proceeds to step 102 to obtain the change rate ΔL of the odor concentration, and then the steps 103 to 10
At 5, the fuzzy inference operation is executed. In this fuzzy inference calculation, the antecedent variable is the odor concentration “L” and the odor concentration change rate “ΔL”, and the consequent variable is the intruding odor amount “W” into the vehicle. Here, the first variable E1 of the antecedent part is the odor concentration L, and the second variable E2 is the odor concentration change rate ΔL. In this fuzzy operation, 25 fuzzy rules as shown by a matrix in FIG. 4 are set according to experience or results obtained by experiments. 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 ... Almost "0" NS ... Small in the negative direction NM ... Medium in the negative direction NL ... Large in the negative direction

For example, one rule is that the odor concentration (E1 =
L) is small (PS) and the odor concentration change rate (E2 = Δ
When L) is large in the positive direction (PL), the amount W of odor intruding into the vehicle is large (PL).

Then, as a membership function expressing the above label for each variable, (a), (b) of FIG.
The one shown in (c) is used. The function of (a) is a membership function of the input variable E1 (odor concentration L),
The function of (b) is a membership function of the input variable E2 (odor concentration change rate ΔL), and the function of (c) is a membership function of the output variable W (amount of odor entering the vehicle). In addition,
The unit of the input variable E1 in the antecedent section is volt (V), and the unit of E2 is volt / second (V / S).

In the fuzzy operation steps 103 to 105, according to the above fuzzy rules, the method disclosed in Japanese Patent Application Laid-Open No. 2-9276
Using the MIN-MAX rule known in Japanese Patent No. 3, etc.,
The inflow odor amount W into the vehicle is calculated. In the flow, first, the grade of the antecedent variables E1 and E2 is obtained by the input side membership function for each rule, and the minimum value is output. Then, the consequent part output W is obtained from the grade for each rule by the output side membership function. And
The output of the consequent part obtained for each rule is logically ORed to obtain the center of gravity, and the position of the center of gravity is set as the intrusion odor amount W which is the final inference result.

Next, the routine proceeds to step 106, where it is determined whether the inferred intruding odor amount W exceeds a reference value, that is, whether invasion of outside air is blocked. In this case, the determination reference value has hysteresis, and when it is on the A side (the intruding odor amount W exceeds the reference value) in the figure, the routine proceeds to step 107, where the intake door is switched to the inside air introduction position (REC),
Prevent contaminated outside air from entering the vehicle. Also, B in the figure
If it is on the side (the intruding odor amount W is below the reference), the routine proceeds to step 108, where normal control is executed. That is, the intake door is controlled based on the above-mentioned comprehensive signal. It should be noted that the normal control subroutine in this case also includes a manual selection determination process using a manual switch. Then, after the processing of step 107 or step 108, the process returns to the main routine of the air conditioning control.

Thus, the amount of odor entering the vehicle is fuzzy inferred not only based on the odor concentration but also based on both the odor concentration and the rate of change of the odor concentration, and the intake door is switched based on the inference result. Therefore, proper switching control is performed.

In the above embodiment, step 1
The processing of 03 to 105 corresponds to the intruding odor amount fuzzy inference means 5 shown in FIG. 1, and the processing of step 106 corresponds to the odor intrusion prevention control execution determining means 6.

[0025]

As described above, according to the present invention,
Since both the odor concentration and its rate of change are used as input factors to infer the amount of odor entering the vehicle, it is possible to properly estimate the amount of odor entering depending on the running state, air conditioning state, etc.
The intake door can be optimally controlled to effectively prevent the entry of odors. Further, since the intruding odor amount with respect to the odor concentration and the rate of change in concentration is fuzzy inferred, the odor prevention control can be performed with an accurate response by merely reflecting the control conditions and the like on the fuzzy rules and membership functions. Further, since this fuzzy inference can be performed by simple rules and functional operations, it does not require complicated control logic, can be easily handled by an existing microcomputer, and there is no fear of increasing costs.

[Brief description of drawings]

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

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

FIG. 3 is a flowchart showing a control operation of the embodiment.

FIG. 4 is a table showing rules of fuzzy inference operation in the example.

5A and 5B show membership functions used in the fuzzy inference operation, where FIG. 5A is a membership function of an antecedent variable E1 (odor concentration L), and FIG. 5B is an antecedent variable E2.
(Odor concentration change rate ΔL) membership function, (c)
Is a membership function of the consequent variable W (amount of odor entering the vehicle).

[Explanation of symbols]

 1 Odor Sensor 2 Intake Door 3 Odor Concentration Calculating Means 4 Odor Concentration Change Rate Calculating Means 5 Intrusion Odor Volume Fuzzy Inference Means 6 Odor Intrusion Prevention Control Execution Judging Means 7 Intake Door Drive Control Means 20 Control Unit

Claims (1)

[Claims] 1. An intake door control device for an air conditioner for a vehicle, which controls an intake door according to a detection value of an odor sensor, comprising: an odor concentration calculating means for calculating an odor concentration from the detection value of the odor sensor; The odor concentration change rate calculation means for calculating the change rate of the odor concentration, the intrusion odor amount fuzzy inference means for fuzzy inference of the invasion odor amount into the vehicle interior based on the odor concentration and the odor concentration change rate, and the fuzzy inference means Odor intrusion prevention control execution determining means for determining whether to execute the odor intrusion prevention control based on the inference result, and when the means determines to execute the odor intrusion prevention control,
An intake door control device for a vehicle air conditioner, comprising: an intake door drive control means for forcibly switching the intake door to an inside air introduction position.