JPH06127258A - Intake door drive control device of automobile air-conditioner - Google Patents

Abstract

PURPOSE:To prevent an intake door from being driven at arbitrary speed out of control due to the wind pressure during traveling at high speed. CONSTITUTION:A fuzzy inference of the target value VINT' of the working speed is executed (step 129) according to the automobile speed and the evaporator temperature change rate, and the actual working speed VINT is controlled so as to be close to the target value (step 131, 132, 133, 134, 135). The working speed is changed by increasing/decreasing the duty ratio of the applied voltage to an intake door actuator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake door drive control device for an automobile air conditioner.

[0002]

2. Description of the Related Art In an automobile air conditioner, an outside air intake for taking in outside air and an inside air intake for taking in inside air are provided at an upstream end of an air conditioning duct. Further, an intake door that selectively opens and closes both intakes by being rotated by an actuator is provided at a branch portion of the two air intakes.

In this case, the outside air intake is usually directed toward the front of the vehicle in order to effectively take in the traveling wind. Therefore, the wind pressure due to the traveling wind acts on the intake door during traveling.

By the way, in the conventional intake door, the operating speed may be arbitrarily increased or decreased due to the influence of the wind pressure, and the passenger may feel uncomfortable. In particular, it is better to move slowly to reduce the change in heat load, but during high speed driving, REC (inside air introduction position) to FRES
When trying to switch to H (outside air introduction position), the movement of the door becomes faster due to the wind pressure due to the traveling wind. Therefore, as the vehicle speed increases, the amount of introduced air increases sharply and the heat load change increases, resulting in a gentle change. There is a problem that it adversely affects the air conditioning control.

In this case, depending on the temperature and humidity of the outside air, a considerably large heat load change may occur at the time of switching the intake door, which deteriorates the air conditioning feeling for a short time.

Incidentally, Japanese Utility Model Laid-Open No. 63-137016 discloses a technique for positively increasing or decreasing the operating speed of the intake door depending on the conditions. This technology increases the operating speed of the intake door when the blowing mode is differential or when the compressor is off, and slows the operating speed at other times. Can not.

[0007]

As described above, the conventional air conditioner for automobiles has a problem that the operating speed of the intake door is arbitrarily increased or decreased depending on the vehicle speed, which gives an occupant an uncomfortable feeling. . Further, there is also a problem that the operating speed becomes particularly high when switching from the introduction of the inside air to the introduction of the outside air, which causes a sudden change in the heat load depending on the temperature and the humidity of the outside air to deteriorate the air conditioning feeling.

In view of the above, the present invention eliminates the fact that the operating speed of the intake door is arbitrarily changed by the vehicle speed, and the speed of the intake door is controlled at an optimum speed when the intake door is switched, so that the vehicle speed, the temperature of outside air, and the humidity can be controlled. An object of the present invention is to provide an intake door drive control device for an air conditioner for an automobile, in which a heat load fluctuation caused by an influence is minimized.

[0009]

In order to solve the above-mentioned problems, the present invention selectively opens and closes the outside air intake 1 and the inside air intake 2 by being rotated as shown in FIG. In an intake door drive control device for an automobile air conditioner having an intake door 3 and an intake door actuator 4 for rotating the intake door 3, a vehicle speed detecting means 5 for detecting a traveling vehicle speed, and an evaporator 6 for the air conditioner. Evaporator temperature detecting means 7 for detecting temperature
And an evaporator temperature change rate calculating means 8 for calculating the change rate of the evaporator temperature detected by the detecting means 7, and a target value VINT 'of the operating speed of the intake door 3 based on the traveling vehicle speed and the evaporator temperature change rate. Fuzzy reasoning means 9 for intake door actuation speed target value for fuzzy reasoning
And the intake door position detecting means 10 for detecting the current position of the intake door 3, and the operating speed VIN of the intake door 3 based on the detection output of the intake door position detecting means 10.
Intake door operation speed calculation means 11 for calculating T,
The intake door operation speed target value fuzzy inference means 9
And the intake door drive control means 12 for supplying the intake door actuator 4 with a control signal for controlling the intake door operation speed so as to eliminate the deviation between the target value VINT ′ deduced by the above and the output value VINT of the intake door operation speed calculation means 11. It is characterized by having.

[0010]

According to the intake door drive control device having the above structure, the target value of the operating speed is fuzzy inferred in accordance with the vehicle speed and the evaporator temperature change rate, and the actual operating speed is controlled so as to be the speed. Therefore, the intake door 3 can be moved at an operating speed that takes into consideration the influence of traveling wind and the influence of the temperature and humidity of the outside air. In the fuzzy calculation means 9 in this case, the vehicle speed and the evaporator temperature change rate are used as the antecedent variable, and the consequent output is used as a direct operating speed target value or a basic variable for calculating the operating speed target value. .

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.

In the fuzzy operation, first, according to each fuzzy rule, by a membership function given in advance,
The grades of the vehicle speed and the evaporator temperature change rate, which are variables of the antecedent (the degree of belonging to the fuzzy label, or the membership value) are calculated, and the minimum value of both grades is taken. This process is called antecedent process. Next, as a consequent part processing, the output side membership function is truncated at the above grade, the trapezoidal output obtained by the trimming is ORed, and the center of gravity of the superimposed trapezoidal parts is obtained. , Its center of gravity is the inference result.

This inference method is disclosed, for example, in Japanese Patent Laid-Open No. 2-927.
The method known in Japanese Patent No. 63 is used.
Other inference methods may be adopted separately.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. In the air conditioner of this embodiment,
As shown in FIG. 1, at the upstream end of the air conditioning duct 20, an outside air intake 1 for taking in outside air and an inside air intake 2 for taking in inside air are provided. Outside air intake 1
Is facing the front of the vehicle in order to effectively take in the driving wind. Also, the above two air intakes 1, 2
An intake door 3 that selectively opens and closes both intakes 1 and 2 is rotatably provided at the branch portion of the.

The intake door 3 is rotated by an intake door actuator 4. As the intake door actuator 4 in this case, a DC motor is used, in which the driving force changes according to the applied voltage (average applied voltage in the case of duty control) and the rotation speed changes. Further, in the air conditioning duct 20, air conditioning elements such as a blower fan 21, an evaporator 6, an air mix door, a heater, and a mode door are arranged in order toward the downstream side. Here, illustration is omitted except for the blower fan 21 and the evaporator 6.

Next, the configuration of the control system will be described. As shown in FIG. 2, the control unit 3 is the center of the control system.
0 is provided. The control unit 30 is mainly composed of a microcomputer, and other than that, A
It includes a D / D converter, an input / output interface, and drive circuits for various actuators.

On the input side of the control unit 30,
A sensor (vehicle speed detecting means) 5 for detecting the vehicle speed, and an intake door position detecting potentiometer (intake door position detecting means) 10 for detecting the current position of the intake door.
A sensor 31 for detecting a heat load such as an outside air temperature sensor, an inside air temperature sensor, and a solar radiation sensor, a temperature setting switch 32 for setting a vehicle interior temperature, and a duct sensor (evaporator temperature detecting means) for detecting the outlet temperature of the evaporator 6. 7 and various operation switches 33 are connected, and a detection signal, a setting signal, or an operation signal is appropriately input from these elements.

On the output side of the control unit 30, a blower fan motor 41, an air mix door actuator 42, and a compressor (strictly speaking, a magnetic clutch connecting the compressor and the engine) 43.
The intake door actuator 44 and the mode door actuator 45 are connected to each other, and drive signals are output to the respective control elements. In this embodiment, the control unit 30 performs processing in accordance with a predetermined program, so that the evaporator temperature change rate calculating means 8, the intake door operating speed target value fuzzy calculating means 9 and the intake door operating speed calculating shown in FIG. The functions of the means 11 and the intake door drive control means 12 are achieved.

Next, the contents of the air conditioning control performed by the control unit 30 will be described with reference to FIGS.
This will be described with reference to the flowcharts of FIGS. 6 and 7.

The overall flow of the air conditioning control is roughly as shown in FIG. That is, first, in step 101, various sensor signals and in step 102 various switch signals are input to the CPU of the microcomputer. Next, at step 103, the total signal T corresponding to the heat load inside the vehicle is calculated. The total signal T is obtained as a function of the outside temperature, the inside temperature, the amount of solar radiation, and the set temperature.

Next, in step 104, the air mix door is controlled based on the total signal T, and in step 105, air blowing control is performed. Next, in step 106, the mode door for switching the blowing mode is controlled, in step 107, the intake door 3 is controlled, and in step 108, the compressor is controlled.

Next, the intake door control, which is a feature of the present invention, will be described in detail with reference to FIGS. 5, 6 and 7. The symbols used in the following description have the following meanings. INT = detection position of intake door by potentiometer INT '= target position of intake door VINT = detection value of actual operation speed of intake door VINT' = target value of operation speed of intake door However, INT and INT 'values are As shown in FIG.
EC (inside air introduction position), MIX (inside and outside air mixture), FRE
It is set to increase linearly in the order of (introduction of outside air).

When the intake door control of FIG. 5 starts, first, at step 111, the current position (detection position) INT of the intake door 3 is input, and at step 112, the vehicle speed detection value and the evaporator temperature detection value are input. next,
In step 113, manually REC (introduce internal air)
Determines if the mode is specified. If there is a manual designation of REC mode, step 115
Set the REC flag to "1" at step 12
Go to 2.

If there is no manual designation of the REC mode, the process proceeds from step 113 to step 114, and the RE
The C flag is reset to "0", and the routine proceeds to step 116, where it is judged manually whether the FRE (outside air introduction) mode is designated. FRE manually
If the mode is designated, the process proceeds to step 120. If the FRE mode is not specified manually, it means that the automatic control has been selected and the routine proceeds to step 117, where the target position IN of the intake door 3 is based on the total signal T.
Calculate T '.

Next, at steps 118 and 119, the target position of the intake door 3 under automatic control is FRE, MI.
It is determined which of X and REC, the process proceeds to steps 120, 121 and 122 respectively according to the determination result, and the target position INT ′ of the intake door 3 is set to “FRE”,
It is decided to be either “MIX” or “REC”.

After the target position INT 'of the intake door 3 is determined in steps 120, 121 and 122, the process proceeds to step 123 shown in FIG. 6 and the deviation between the detected position INT of the intake door 3 and the target position INT' is allowed. It is judged whether it is within the value P. If it is within the allowable value, the judgment is YE.
When S is reached, the routine proceeds to step 136, where the intake door actuator 4 is stopped. That is, there is no need to move the intake door 3 at the target position.

If the allowable value P is exceeded, that is, if there is a difference between the target position INT 'and the detected position INT, the routine proceeds to step 124, where the target position INT' is subtracted from the detected position INT. Value is positive.
That is, it is determined in which direction the intake door 3 should be rotated.

From the relationship shown in FIG. 3, when the detected position INT is larger than the target position INT ', it means that the current position is on the FRE side of the target position, so that the step 1
The determination of 24 is YES and the routine proceeds to step 125, where a signal for moving the intake door 3 in the REC direction is output. Further, when the detected position INT is smaller than the target position INT ', it means that the current position is on the REC side of the target position, and therefore the determination in step 124 is NO and the routine proceeds to step 126, where the intake door 3 Output a signal to move the FRE direction.

Next, the routine proceeds to step 127, where it is judged whether or not the REC flag is "1", and if YES, that is, the manual REC is selected and the REC flag is "1", the routine proceeds to step 128 where the intake at maximum duty (Duty MAX) is taken. Move the door 3.

If the determination in step 127 is NO, the process proceeds to step 129, and the operating speed target value VINT 'of the intake door 3 according to the vehicle speed and the evaporator temperature change rate is calculated. In this case, generally speaking, the higher the vehicle speed, the smaller the operating speed target value VINT 'is calculated. Then, in step 130, the current position signal of the intake door 3 is differentiated to obtain the actual operating speed VINT of the intake door 3, and in step 131, the deviation between the operating speed calculation value VINT and the operating speed target value VINT 'is an allowable value. Judge whether it is within Q or not.

When the deviation is within the permissible value Q, the operating speed is equal to the target, so there is no need to change the speed, and the routine proceeds to step 132, and the current duty ratio is maintained. That is, the current output is continued.

If the deviation exceeds the permissible value Q, it is judged in step 133 whether the actual operating speed VINT is larger or smaller than the target value VINT '. If the actual speed is large, the routine proceeds to step 134 to output the output. The duty ratio is reduced in order to lower the duty. If the actual speed is low, step 1
In step 35, the duty ratio is increased to increase the output.

Next, the operation speed target value calculation routine will be described with reference to FIG. If this routine is starred, first in step 201, the vehicle speed is set to E1. Next, the evaporator temperature Te detected in step 202 is differentiated to obtain the evaporator temperature change rate (dTe / dt), and the value is set as E2. Then, in steps 203 to 205, the deceleration rate J of the operating speed of the intake door is fuzzy inferred using the values of E1 and E2 as input variables.

The fuzzy inference uses the antecedent variables E1, E2.
And the consequent variable is the deceleration rate J (the individual value for each rule is J
i). In this fuzzy reasoning,
28 fuzzy rules as shown in the table in FIG. 8 are set based on the experience or the 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

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 the membership function of the input variable E1 (vehicle speed), the function of (b) is the membership function of the input variable E2 (evaporator temperature change rate), and the function of (c) is the output variable (deceleration rate). It is a membership function. The input variable E1 of the antecedent part
The unit of K is Km / sec, and the unit of E2 is deg / sec.

Steps 203, 204 of fuzzy inference,
In 205, according to the above fuzzy rule, the method disclosed in JP-A-2-
The deceleration rate J is calculated using the MIN-MAX rule known in Japanese Patent Publication No. 92763. The flow is as follows. First, the grade Wi of the antecedent variables E1 and E2 is obtained by the input side membership function for each rule (step 20).
3) Next, the output side membership function is used to calculate the deceleration rate Ji, which is the consequent part output, for each grade of each rule (step 204). Then, 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 deceleration rate J which is the final inference result.

After the deceleration rate J is obtained, the routine proceeds to step 206, where the speed correction amount ΔVINT ′ is calculated by the following equation ΔVINT ′ = K × J / 100 (K is a constant). Then, step 207
6, the operating speed target value VINT 'is calculated from this speed correction amount ΔVINT', and the routine returns to FIG.

Since the intake door operating speed is controlled on the basis of the vehicle speed and the evaporator temperature change rate in this way, the discomfort of the occupant can be eliminated and the heat load change at the time of switching the intake door can be suppressed. It is possible to reduce the deterioration of the air conditioning feeling.

In the above control, the minimum value of the intake door switching time (for example, REC → FRE) is about 5 seconds and the maximum value is about 8 seconds. Further, the time constant of the evaporator temperature detecting sensor is about 3 to 4 seconds. Therefore, in order to increase the effectiveness of the above control, RE
Decrease the initial speed when switching C → FRE (for example, RE
It is desirable that the speed until switching from C to FRE is about 20 to 30 seconds), and during this period, the evaporator temperature change rate is calculated to calculate the final speed. The flowchart in that case is as shown in FIG.

In the routine of FIG. 10, the timer T is first
1 is set (step 302), a timer flag is set and the initial 3 seconds are measured. Then, for the initial 3 seconds, a slow value W as the operating speed target value VINT '(the speed until switching from REC to FRE is a slow speed of about 20 to 30 seconds).
After 3 seconds, the operating speed fuzzy calculation (step 200) shown in FIG. 10 is executed. By doing so, a reliable change in the evaporator temperature can be reflected in the control content.

[0042]

As described above, according to the present invention,
The intake door can be moved at a speed corresponding to the vehicle speed and the temperature change rate of the evaporator. Therefore, the operating speed does not change arbitrarily depending on the vehicle speed, and the occupant's discomfort can be eliminated. In addition, it is possible to suppress a rapid change in heat load due to a change in operating speed when rotating from the inside air introduction side to the outside air introduction side. Therefore,
It is possible to realize a comfortable air conditioning feeling that is not affected by the vehicle speed, the temperature of the outside air, and the humidity.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a control system of an air conditioner according to an embodiment of the present invention.

FIG. 3 is a diagram showing the relationship between the position of the intake door and the output of the potentiometer in the same embodiment.

FIG. 4 is a flowchart of a main routine showing the control contents of the embodiment.

FIG. 5 is a flowchart showing details of contents of intake door control in the main routine.

6 is a continuation of the flowchart of FIG.

FIG. 7 is a flowchart showing details of the contents of step 129 of the flowchart of FIG.

8 is a table showing fuzzy rules used in the fuzzy inference shown in the flowchart of FIG.

9A and 9B show membership functions used for the fuzzy inference, where FIG. 9A is a membership function of an antecedent variable E1 (vehicle speed), and FIG. 9B is a member of an antecedent variable E2 (evaporator temperature change rate). The ship function, (c), is the membership function of the consequent variable (intake door deceleration rate J).

FIG. 10 is a flowchart showing another example of a target speed calculation routine.

[Explanation of symbols]

 1 Outside Air Intake 2 Inside Air Intake 3 Intake Door 4 Intake Door Actuator 5 Vehicle Speed Detecting Device 6 Evaporator 7 Evaporator Temperature Detecting Device 8 Evaporator Temperature Change Rate Calculating Device 9 Intake Door Operating Speed Target Value Fuzzy Calculating Device 10 Intake Door Position Detecting Device 11 Intake door operation speed calculation means 12 Control means 30 Control unit

Claims (1)

[Claims] 1. An intake of an air conditioner for an automobile, comprising: an intake door that selectively opens and closes an outside air intake and an inside air intake by being pivotally operated; and an intake door actuator that rotates the intake door. In the door drive control device, a vehicle speed detecting means for detecting the traveling vehicle speed, an evaporator temperature detecting means for detecting the temperature of the evaporator of the air conditioner, and an evaporator temperature change rate for calculating the change rate of the evaporator temperature detected by the detecting means. A calculating means, an intake door operating speed target value for fuzzy inferring a target value of the operating speed of the intake door based on the traveling vehicle speed and an evaporator temperature change rate, and an intake door position for detecting the current position of the intake door. The detection means and the detection output of the intake door position detection means Intake door operating speed calculating means for calculating the operating speed of the intake door, and the intake door operating speed so as to eliminate the deviation between the target value inferred by the above-mentioned fuzzy inference means And an intake door drive control means for supplying a control signal for controlling the intake door actuator to the intake door actuator.