JP3423011B2 - Vehicle air conditioner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a vehicle, which controls the amount of air blow in accordance with the operation of a control door such as an air mix door. 2. Description of the Related Art Generally, an air conditioner for a vehicle is provided with a blower, an air mix door, an intake door, a mode door and the like in a ventilation duct, and each door is controlled by an electric servomotor or an air pressure (negative pressure). ) Type actuator. When these doors are driven,
The airflow is driven against the airflow generated by the blower, or the airflow is driven by a tailwind. Therefore, particularly when the blower blow rate is large, a large force is required to move the door against the airflow, and a driving source having a large capacity is required. In view of the above, there has been proposed a technique for reducing the amount of air blow while driving these doors, thereby reducing the driving force (Japanese Patent Laid-Open No. Sho 62-1105).
No. 13). [0005] However, in the prior art described in the above-mentioned publication, the air flow rate is reduced uniformly only when the condition that the door is driven is satisfied. However, there is an inadequate point that the air flow is reduced even in the case where there is no air flow. The present invention has been made in view of the above circumstances, and provides an air conditioner for a vehicle which can perform air volume reduction control only when it is really necessary, and can minimize the sense of discomfort given to an occupant. Aim. According to the present invention, as shown in FIG. 1, a ventilation duct 1 and a blower for generating an airflow for air conditioning in a vehicle are provided in the ventilation duct 1, as shown in FIG. 2
And a control door 3 provided in the ventilation duct 1 for changing the flow direction of the air flow, and an actuator 4 for driving the control door 3, the target air flow Bv of the blower 2 is calculated in the vehicle air conditioner. Means 5 and control door 3
Means 6 for detecting the operating speed of the air conditioner, and means 7 for fuzzy inference of the air flow reduction amount ΔBv based on the target air flow amount Bv and the control door operating speed SA output by these means.
And a target air volume correction means 8 for correcting the target air volume Bv based on the air volume reduction amount ΔBv inferred by the means 7 (Bv−ΔBv → Bv), and a target air volume Bv output from the correction means 8. And a blower control means 9 for controlling the blower. In the apparatus according to the present invention, the fuzzy inference means 7 uses the air volume (target air volume) Bv and the actual control door operating speed (control door delay) SA to reduce the air volume ΔBv.
Fuzzy inference. In other words, in this case, the antecedent variable (input) of the fuzzy inference is the target airflow Bv and the control door operating speed SA, and the consequent variable (output) is the airflow reduction amount ΔB.
v. Then, the target air flow rate Bv is corrected based on the inferred air volume reduction amount ΔBv, and the corrected target air flow rate Bv is corrected.
The blower is driven and controlled so as to be v. As a result, the air flow reduction control is performed only when it is really necessary (for example, when the air flow is large and the control door operation speed is low). The fuzzy inference outputs inference results in accordance with fuzzy rules determined based on empirical rules and the like, and the procedure of the method is as follows, for example. In the fuzzy operation, first, according to each fuzzy rule, by a membership function given in advance,
Each grade (also referred to as a degree of fuzzy label or membership value) of the target air flow rate Bv and the control door operating speed SA, which are variables in the antecedent part, is determined, and the minimum value of both grades is determined. This processing is called antecedent processing.
Next, as consequent part processing, the output side membership function is truncated at the above grade, and the trapezoidal output obtained by truncation processing is ORed, and the center of gravity of the superimposed trapezoidal part is obtained. , The position of the center of gravity is inferred, that is, the airflow reduction amount ΔB
v. This inference method is disclosed, for example, in Japanese Patent Laid-Open No. 2-927.
A technique known in, for example, Japanese Patent Publication No. 63-63 is applied. As the inference method, another method may be adopted. An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a schematic diagram illustrating the entire configuration of the air conditioner of the embodiment. In this figure, reference numeral 10 denotes a ventilation duct, and at an upstream end of the ventilation duct 10, an inside air inlet 12 switched by an intake door 11.
A VENT outlet 15, a DEF outlet 16, and a FOOT outlet 17, which are switched by the outlet doors 14a and 14b, are provided at the downstream end. A blower 18, an evaporator 19, an air mix door 20, and a heater 21 are provided in the middle of the ventilation duct 10 in order from the upstream side to the downstream side. By controlling the opening (position) of the air mix door 20, the mixing ratio of the cool air and the warm air is adjusted to adjust the temperature of the air blown into the vehicle. Reference numeral 22 denotes an intake door actuator, 23 denotes a compressor which forms a cooling system together with an evaporator, 24 denotes an air mix door actuator, 25 denotes a heater water valve, and 26 denotes a mode door actuator. The actuators are controlled by a control unit 30. Control unit 3
Numeral 0 is mainly composed of a microcomputer, and calculates a total signal corresponding to the heat load in the vehicle based on the input information from the temperature sensor 31, the outside temperature sensor 32, the temperature setting device 33, and the solar radiation sensor 34. The target position of the air mix door 20 and the target airflow of the blower 18 are calculated based on the calculated total signal. Then, based on the calculated value, the air mix door 20 and the blower 18
Control. Similarly, it controls the intake door 11, the evaporator 19, and the heater 21. A signal of a potentiometer 35 for detecting the position of the air mix door 20 is input to the control unit 30, and feedback control is performed on the position of the air mix door 20 based on the signal of the potentiometer 35. Will be Next, the contents of the air-conditioning control performed by the microcomputer in the control unit 30 will be described.
This will be described with reference to FIGS. In this air conditioning control, the processing of the main routine shown in FIG. 3 is repeatedly executed at predetermined time intervals. In the main routine, first, in a first step 100, signals of various sensors including the in-vehicle temperature sensor 31, a temperature setter, a potentiometer, a switch and the like are input.
Next, in step 200, a total signal corresponding to the heat load in the vehicle is calculated based on signals from various sensors and the like, and in step 300, the target position of the air mix door and the target airflow of the blower are calculated based on the calculated total signal. Is calculated. Then, based on these calculation results, the air mixing door is controlled in step 400, and step 5
00 controls the blow-out mode door, controls the intake door in step 600, executes the blowing control in step 700, executes the compressor control in step 800, and ends one process. Here, the blower control 700 proceeds with specific processing as shown in the flowchart of FIG. First, at step 710, it is determined whether or not the air mix door 20 is operating. If it is not operating (in the case of NO), that is, if it is stopped, there is no need to perform the air volume reduction control. Therefore, the process directly proceeds to step 770 to control the blower 18 so as to reach the target air volume Bv obtained earlier. Return to the main routine. If the air mix door 20 is in operation (in the case of YES), the air flow reduction control is to be performed.
Of the operation speed is calculated. That is, the operation speed (operation speed) of the air mix door 20 is obtained by differentiating the position signal of the air mix door 20 detected by the potentiometer 35, and a predetermined reference value (for example, the operation speed when the air volume is zero, or The actual operation speed of the air mix door 20 is subtracted from the (target operation speed) to determine the degree SA of the operation speed of the air mix door 20. This delay is a large value when the air mix door 20 is operated against the airflow. Next, the process proceeds to steps 730, 740 and 750 in order to execute fuzzy inference. This fuzzy inference is based on the assumption that the antecedent variables are the target air flow rate Bv (here, given as the terminal voltage of the blower) and the slowness of the air mixing door operating speed SA (unit is the air mixing door opening degree “% /
sec ”), and the consequent variable is the airflow reduction amount ΔBv (unit is voltage). In this fuzzy inference, thirteen fuzzy rules as shown in a matrix in FIG. 5 are set based on empirical rules or results obtained through experiments or the like. 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 The rule is that "if the target air flow rate Bv is large (PL) and the air mixing door operation speed is very low (the degree of delay is large = PL), the air flow reduction amount is large (PL)". . FIGS. 6A, 6B and 6C show membership functions expressing the labels for each variable.
The one shown in (c) is used. The function of (a) is a membership function of a first input variable (target airflow rate Bv), the function of (b) is a membership function of a second input variable (SA of air mix door operation speed),
The function (c) is a membership function of the output variable (air volume reduction amount ΔBv). In the steps 730 to 750 of the fuzzy operation, according to the above-mentioned fuzzy rules, the method described in
Using the MIN-MAX rule known in Japanese Patent Publication No. 3
The air volume reduction amount ΔBv is calculated. In the flow, first, the grade Wil of the antecedent variables Bv and SA is obtained by the input side membership function for each rule, and the minimum value is output. Next, a consequent part output ΔBv is obtained from the grade for each rule by the output side membership function. Then, the output of the consequent part obtained for each rule is ORed to determine the center of gravity, and the position of the center of gravity is set as the airflow reduction amount ΔBv which is the final inference result. After fuzzy inference of the air flow reduction amount ΔBv, the process proceeds to step 760 to calculate a new target air flow amount Bv by subtracting the inference value ΔBv from the target air flow amount Bv. Thereafter, the process proceeds to step 770, in which the blower is controlled so that the corrected target air volume Bv is obtained, and the process returns to the main routine. As described above, during the operation of the air mixing door, the air flow reduction amount is obtained in accordance with the target air flow amount and the delay in the actual operation speed, and the air flow reduction control is performed based on the value. Only when necessary, a required amount of air flow reduction control is performed. Therefore, comfortable in-vehicle air-conditioning with minimal discomfort to the occupant is performed. In the above-described embodiment, an example of an air mix door is shown as an example of the control door, and an example in which the air volume is reduced during the operation of the air mix door has been described. Similar control may be performed in accordance with the operation of the door or the mode door. In addition,
In that case, it is necessary to provide a means for detecting the operating speed of each door. As described above, according to the present invention,
Only when it is truly necessary, the required amount of air flow reduction control is performed. Therefore, the discomfort given to the occupant can be minimized.

BRIEF DESCRIPTION OF THE 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 main routine of a control operation of the embodiment. FIG. 4 is a flowchart showing a routine of air blowing control of the embodiment. FIG. 5 is a table showing rules of fuzzy inference executed in the airflow control of the embodiment. 6A and 6B show membership functions used in the above fuzzy inference, wherein FIG. 6A shows a membership function of an antecedent variable Bv (target airflow), and FIG. 6B shows an antecedent variable SA (operation of an air mix door). (C) is a membership function of the consequent variable ΔBv (air flow reduction amount). [Explanation of Signs] 1,10 Ventilation duct 2,18 Blower 3 Control door 4 Actuator 5 Target air flow rate calculating means 6 Control door operation speed detection means 7 Air flow reduction fuzzy inference means 8 Target air flow correction means 9 Blower control means 11 Intake doors 14a, 14b Mode door 20 Air mix door 30 Control unit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-103430 (JP, A) JP-A-57-147914 (JP, A) JP-A-1-289712 (JP, A) JP-A-4- 43115 (JP, A) JP-A-62-210114 (JP, A) JP-A-58-118008 (JP, U) JP-A-63-137016 (JP, U) JP-A-56-51618 (JP, U) 63-152707 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60H 1/00 101

Claims (1)

(57) [Claims 1] A ventilation duct, a blower for generating an air flow for air conditioning in a vehicle in the ventilation duct, and a direction of the air flow provided in the ventilation duct is changed. In a vehicle air conditioner comprising a control door and an actuator for driving the control door, a means for calculating a target air flow rate of the blower, a means for detecting an operation speed of the control door, Means for fuzzy inference of the air flow reduction based on the output target air flow and the control door operating speed; target air flow correction means for correcting the target air flow based on the air flow reduction estimated by the means; And a blower control means for controlling the blower so as to attain a target air flow rate output by the means.