JP3167399B2 - Intake door drive control device for automotive air conditioner - Google Patents

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 a vehicle air conditioner.

[0002]

2. Description of the Related Art In an air conditioner for an automobile, 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. In addition, an intake door is provided at a branch of the two air intakes so as to selectively open and close both intakes by being rotated by an actuator.

[0003] In this case, the outside air intake usually faces the front of the vehicle in order to easily take in the traveling wind effectively. Therefore, during traveling, wind pressure due to traveling wind acts on the intake door.

[0004] Incidentally, in the conventional intake door, the operating speed is increased or decreased without permission under the influence of the wind pressure, and the occupant may feel uncomfortable. In particular, it is better to move slowly to reduce noise change and thermal load change. However, when switching from REC (inside air introduction position) to FRESH (outside air introduction position) during high-speed driving, the door moves as described above. The wind speed increases due to the wind pressure caused by the running wind, so the higher the vehicle speed, the more the amount of air introduced increases, causing a sudden change in the fan volume, causing annoyance, and a sudden change in the heat load for gentle air conditioning control. There was a problem of adverse effects.

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

[0006]

As described above, the conventional air conditioner for automobiles has a problem that the operating speed of the intake door is increased or decreased depending on the vehicle speed, which gives a passenger an uncomfortable feeling. . In addition, there is also a problem that the operation speed is increased particularly when switching from the inside air introduction to the outside air introduction, resulting in an increase in fan volume and a sudden change in heat load.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an intake door drive control device of an air conditioner for a vehicle, which can move the intake door at a constant operating speed according to the vehicle speed.

[0008]

In order to solve the above-mentioned problems, the present invention selectively opens and closes an outside air intake 1 and an inside air intake 2 by being rotated as shown in FIG. In an intake door drive control device for an automotive 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; Intake door operating speed target value calculating means 6 for calculating a target value of the operating speed of intake door 3 in accordance with the detected vehicle speed; intake door position detecting means 7 for detecting the current position of intake door 3; Intake door operating speed calculating means 8 for calculating the operating speed of intake door 3 from the detection output of detecting means 7; Control means 9 for supplying a control signal for controlling the operation speed of the intake door to the intake door actuator 4 so as to eliminate a deviation between the target value calculated by the characteristic value calculation means 6 and the output of the intake door operation speed calculation means 8. It is characterized by having.

[0009]

According to the intake door drive control device having the above structure, the target value of the operating speed is calculated in accordance with the vehicle speed, and the actual operating speed is controlled so as to reach the target speed. Therefore, the intake door 3 can be moved at a predetermined operating speed regardless of the influence of the traveling wind. For example, the intake door 3 can be moved more slowly as the vehicle speed increases.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail 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 8, an outside air intake 1 for taking in outside air and an inside air intake 2 for taking in inside air are provided. The outside air intake 1
It faces the front of the vehicle to make it easier to take in the traveling wind effectively. An intake door 3 for selectively opening and closing the two intakes 1 and 2 is rotatably provided at a branch portion of the two air intakes 1 and 2.

The intake door 3 is rotated by an intake door actuator 4. As the intake door actuator 4 in this case, a DC motor whose driving force changes according to an applied voltage (average applied voltage in the case of duty control) and whose rotation speed changes is used. In the air-conditioning duct 8, air-conditioning elements such as a blower fan, an evaporator, an air mix door, a heater, and a mode door are arranged in order toward the downstream side. Here, illustration other than the blower fan is omitted.

Next, the configuration of the control system will be described. As shown in FIG. 2, the control unit 1 is at the center of the control system.
0 is provided. This control unit 10 is mainly composed of a microcomputer,
/ D converter, input / output interface, drive circuits for various actuators, etc.

On the input side of the control unit 10,
A sensor (vehicle speed detecting means) 5 for detecting a vehicle speed and a potentiometer (intake door position detecting means) 7 for detecting an intake door position for detecting a current position of the intake door.
And a sensor 11 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 12 for setting the temperature inside the vehicle, and various operation switches 13. A detection signal, a setting signal, and an operation signal are input.

On the output side of the control unit 10, a motor 14 of a blower fan, an air mix door actuator 15, and a compressor (strictly, a magnetic clutch for connecting the compressor and the engine) 16 are provided.
, The intake door actuator 4 and the mode door actuator 17 are connected so as to output a drive signal to each of these control elements. In this embodiment, the functions of the intake door operating speed target value calculating means 6, the intake door operating speed calculating means 8, and the control means 9 shown in FIG. To achieve.

Next, the contents of the air-conditioning control performed by the control unit 10 will be described with reference to FIGS.
This will be described with reference to the flowchart of FIG.

The overall flow of the air conditioning control is approximately 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, a total signal T corresponding to the in-vehicle heat load is calculated. The total signal T is obtained as a function of the outside air temperature, the inside air temperature, the amount of solar radiation, and the set temperature.

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

Next, the intake door control, which is a point of the present invention, will be described in detail with reference to FIGS. The meanings of the symbols used in the following description are as follows. INT = detected position of intake door by potentiometer INT '= target position of intake door V _INT = detected value of actual operating speed of intake door V _INT ' = target value of operating speed of intake door However, values of INT and INT ' Is, as shown in FIG.
EC (inside air introduction position), MIX (inside / outside air mixing), FRE
It is set so as to increase linearly in the order of (introduction of outside air).

When the intake door control shown in FIG. 5 starts, first, at step 111, the current position (detection position) INT of the intake door 3 is input, and at step 112, a vehicle speed detection value is input. Next, in step 113, it is determined whether or not the REC (inside air introduction) mode is manually specified. If the REC mode is manually specified, the FRE flag is set to “1” in step 115, and the process proceeds to step 122.

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

Next, at steps 118 and 119, the target position of the intake door 3 under the automatic control is set to FRE, MI.
X, or REC, and proceeds to steps 120, 121, and 122, respectively, according to the determination result, and sets the target position INT ′ of the intake door 3 to “FRE”,
It is determined 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, where the deviation between the detected position INT of the intake door 3 and the target position INT' is allowable. It is determined whether the value is within the value P. If within the allowable value, the judgment is YE
In S, the routine proceeds to step 134, where the intake door actuator 4 is stopped. That is, there is no need to move the intake door 3 because the intake door 3 is located at the target position.

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

If the detected position INT is larger than the target position INT 'from the relationship shown in FIG. 3, it means that the current position is on the FRE side of the target position.
When the determination at 24 is YES, the process proceeds to step 125, where a signal for moving the intake door 3 in the REC direction is output. If the detected position INT is smaller than the target position INT ', it means that the current position is on the REC side from the target position, so the determination in step 124 is NO and the process proceeds to step 126, where the intake door 3 Is output in the FRE direction.

Then, the process proceeds to a step 127, wherein it is determined whether or not the REC flag is "1". If YES, that is, if the manual REC is selected and the REC flag is "1", the process proceeds to a step 128 and the intake is performed at the maximum duty (Duty MAX). Move door 3. If the determination in step 127 is N
If it is O, the routine proceeds to step 129, where an operation speed target value V _INT 'of the intake door 3 according to the vehicle speed is calculated. In this case, the target operating speed V _INT 'is calculated to be smaller as the vehicle speed is higher. Then, in step 130, the actual operation speed V _INT of the intake door 3 is obtained by differentiating the current position signal of the intake door 3, and in step 131, the deviation between the calculated operation speed V _INT and the target operation speed V _INT ′ is obtained. Is within the allowable value Q.

When the deviation is within the allowable value Q, the operating speed is as desired, so that there is no need to change the speed, and the routine proceeds to step 132, where the current duty ratio is maintained. That is, the current output is continued as it is.

If the deviation exceeds the allowable value Q, it is determined in step 133 whether the actual operating speed V _INT is higher or lower than the target value V _INT ′. If the actual speed is higher, the process proceeds to step 134. To reduce the output, decrease the duty ratio. If the actual speed is low, the routine proceeds to step 135, where the duty ratio is increased to increase the output.

By performing the control as described above,
The operation speed of the intake door 3 becomes the target value determined according to the vehicle speed, and the intake door 3 moves at a predetermined slower speed as the vehicle speed increases. As a result, the occupant can be prevented from feeling uncomfortable, and a change in volume of the blower fan and a change in heat load can be reduced.

[0029]

As described above, according to the present invention,
The intake door can be moved at the target speed determined according to the vehicle speed. Therefore, the operating speed does not change arbitrarily depending on the vehicle speed, and the occupant's uncomfortable feeling can be eliminated. In addition, the operating speed when rotating from the inside air introduction side to the outside air introduction side can be slowed down, thereby suppressing the sudden introduction of outside air, and preventing a sudden change in the sound of the blower fan and a sudden change in the heat load. Can be held down.

[Brief description of the 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 the air conditioner according to one embodiment of the present invention.

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

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

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

FIG. 6 is a continuation of the flowchart of FIG. 5;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 outside air intake 2 inside air intake 3 intake door 4 intake door actuator 5 vehicle speed detecting means (vehicle speed sensor) 6 intake door operating speed target value calculating means 7 intake door position detecting means 8 intake door operating speed calculating means 9 control means 10 control unit

Claims (1)

(57) [Claims] An intake for a vehicle air conditioner, comprising: an intake door for selectively opening and closing an outside air intake and an inside air intake by being rotated; and an intake door actuator for rotating the intake door. In the door drive control device, a vehicle speed detecting means for detecting a traveling vehicle speed; an intake door operating speed target value calculating means for calculating a target value of the operating speed of the intake door according to the vehicle speed detected by the vehicle speed detecting means; Position detection means for detecting the current position of the intake door, intake door operation speed calculation means for calculating the operation speed of the intake door from the detection output of the intake door position detection means, and calculation of the intake door operation speed target value calculation means So that the deviation between the set target value and the output of the intake door operating speed calculation means is eliminated. Intake door drive control apparatus for a motor-vehicle air-conditioning apparatus, wherein the control means for supplying control signals to the intake door actuator for controlling the Tekudoa operating speed, in that it comprises.