JPH1142922A - Car air conditioner control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the influence of a car air conditioner on the starting property of an automobile engine without loosing the convenience by stopping an air fan incorporated in the car air conditioner or reducing the rotating speed while the drive of a starter motor is detected. SOLUTION: A control device 200 for car air conditioner has an ST(starter) switch 33 which is a starter motor drive detecting means for detecting the drive of the starter motor of an automobile and a microcomputer 26 which is an air fan control means for controlling air fans 4, 5. When an ON switch is outputted from the ST switch 33, it is inputted to the microcomputer 25. The microcomputer 25 detects the ON of ST system and stops the blowing fans 4, 5 for car air conditioner situated in a control part 32 or reduces the rotating speed. Thus, the torque reduction by car air conditioner in engine start can be prevented while keeping the convenience of the car air conditioner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a car air conditioner control device for controlling a car air conditioner used for air conditioning in a vehicle cabin.

[0002]

2. Description of the Related Art As is well known, electric power generated by a part of an engine output is stored in a battery by charging the battery. Distributed to the electrical system. Among such electric systems, an electric system that mainly supplies power to the engine is called an engine electric system. In addition, an electrical system that mainly supplies power to electrical components such as instruments and radios is an accessory (AC
C) system. The ACC system is an electric system that supplies less power than the engine electrical system. Among the engine electrical systems, there are a starter (ST) system that supplies power to a starter motor that consumes the largest amount of electric power, and an ignition (IG) system that supplies power to engine electrical components other than the starter motor.

There are two types of power supply to a car air conditioner: one that supplies power from an ACC system and one that supplies power from an IG system. In a car air conditioner, the power consumption of a fan motor that rotates a blower fan is particularly large. For this reason, it is known as an electrical component having relatively large power consumption, and is often connected to the IG system due to limitations on the allowable current that can be supplied by the ACC system.

[0004]

When the engine is started, electric power must be supplied from an IG system to an ignition coil or the like and electric power for rotating a starter motor is to be supplied from an ST system due to the structure of the automobile. At this time, in order to start the engine smoothly, it is necessary to obtain a sufficient rotation torque of the starter motor.

However, the power supply to the car air conditioner is
If the control is performed by the system, the car air conditioner operates together with the starter motor when the engine is started.
As described above, the car air conditioner is an electrical component that consumes relatively large power. Therefore, when the car air conditioner operates together with the starter motor, the rotational torque of the starter motor may decrease.

In order to prevent the rotation torque from decreasing in such a case, at least the blower fan of the car air conditioner must be turned off at the operation panel at hand before the starter switch for supplying power to the ST system is turned on. Conceivable. However, the car air conditioner, which receives power from the ignition system, stops when the ignition switch for stopping the engine is turned off.Therefore, there is no need to turn it on and off at hand, and the switch at hand is turned on after the last ride. There is a high possibility that the starter switch is left on, and the process of checking and turning it off every time the starter switch is turned on may impair the usability of the car air conditioner.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has been made in consideration of the above-described problems, and is intended to reduce the influence of the car air conditioner on the startability of a car engine without impairing the usability of the car air conditioner. It is intended to provide a device.

[0008]

According to a first aspect of the present invention, there is provided a car air conditioner control device including a blower fan and controlling a car air conditioner to which power is supplied by turning on an ignition switch of the car. A starter motor drive detection means for detecting the drive of a starter motor provided in the vehicle, and a blower fan built in the car air conditioner while the starter motor drive detection means detects the drive of the starter motor. Blower fan control means for stopping the rotation of the blower or reducing the rotation speed of the blower fan.

With this configuration, the power consumption of the blower fan is reduced by automatically stopping the built-in fan in the car air conditioner or reducing the rotation speed of the fan when the starter motor is driven. Can be. Therefore, the battery can supply sufficient electric power to the starter motor, and can obtain sufficient rotation torque of the starter motor for starting the engine.

[0010] The car air conditioner control device according to claim 2 is
A car air conditioner control device having a built-in blower fan and controlling a car air conditioner to which power is supplied by turning on an ignition switch of the car, wherein an accessory switch off detecting an off of an accessory switch provided in the car. Detecting means, while the accessory switch-off detecting means detects that the accessory switch is off, the blower fan control means for stopping the blower fan incorporated in the car air conditioner or reducing the rotation speed of the blower fan, It is characterized by having.

With this configuration, when the accessory switch is turned on, the fan incorporated in the car air conditioner is automatically stopped or the rotational speed of the fan is reduced to reduce the power consumption of the blower fan. Can be. Therefore, the battery can supply a sufficient electric power to the starter motor when the accessory switch is turned off, that is, when the starter motor is started, and a sufficient rotational torque of the starter motor for starting the engine can be obtained.

[0012]

Embodiments of the present invention will be described below.

<First Embodiment> FIG. 1 is a diagram showing an overall configuration to which a car air conditioner control device according to a first embodiment of the present invention is applied.

The illustrated configuration mainly comprises an air-conditioning execution unit 100, which is a mechanical configuration of a car air conditioner, and a control unit 200 including a microcomputer 25 for controlling the air-conditioning execution unit 100.

The air-conditioning execution unit 100 includes an intake unit 1 for taking in air, a cooler unit 7 for cooling the air taken into the intake unit 1 by an evaporator 8, and a heater unit 13 for at least a part of the air passing through the cooler unit 7. And a heater unit 9 that blows into the vehicle interior through a mode door 20 of a differential door, a foot door, and a front door. The amount of air passing through the heater unit 13 is adjusted by the opening and closing amount of the air mix door 15. Mode door 2
0, the air mix door 15, and the intake door 6 are driven by a mode door actuator 24, an air mix door 23, and an intake door actuator 22, respectively.

The intake unit 1 has a built-in intake door 6 for selectively opening and closing the inside air intake 3 and the outside air intake 2, and a fan 4 for taking in inside air or outside air. 5 to rotate.

The mode door actuator 24, the air mix door 23, the intake door actuator 22, and the fan motor 5 of the air conditioning execution unit 100 described above include:
Electric power is supplied from the IG system of an automobile equipped with a car air conditioner, and the fan motor 5 consumes the largest amount of electric power.

Control unit 200 for controlling air-conditioning execution unit 100
Has an operation unit 32 for setting desired air-conditioning conditions for the microcomputer 25, and an ACC switch 31, an IG switch 32 for outputting power supply states of ACC, IG, and starter systems. Connected to ST switch 33.

An operation unit 32 for setting desired air-conditioning conditions in the microcomputer 25 includes an operation unit 32b composed of a switch or a dial for the user to input the air-conditioning conditions to the microcomputer 25, and inputs the input air-conditioning conditions to the microcomputer 25. Operation / display for processing a signal output in accordance with the processed signal, a communication circuit 32c, and a display unit 32a such as a liquid crystal panel for displaying to a user a result or input condition processed by the operation / display / communication circuit 32c. ing.

FIG. 2 shows each switch and ACC system, IG system,
The relationship with each electric system of the ST system is shown. ACC switch 3
1. The IG switch 32 and the ST switch 33 have a configuration known as a so-called key cylinder switch provided in an automobile body. As shown, the ACC switch 31 is a switch that supplies power only from the ACC system.
In this state, the lighting of the instrument and the operation of the radio become possible. The IG switch 32 is connected to the IG
A switch that also supplies power from the system. In this state, the lighting of the instrument and the radio are activated, the car air conditioner is activated, and power can also be supplied to the ignition coil and the like.

The ST switch 33 is a switch for supplying electric power to the IG system and the ST system. In this state, a starter motor (not shown) rotates, and the compressed air-fuel mixture explodes due to the large voltage generated in the ignition coil. And start the engine. When the starter motor rotates, the ACC switch 31 is automatically turned off so that the battery can supply sufficient power to the starter motor M.

In the present embodiment, at this time, the car air conditioner connected to the ignition system is also stopped, or the rotation speed of the motor 5 for rotating the fan 4 is reduced so that the battery can be supplied to the starter motor M more sufficiently. Power supply. This point is a main part of the present invention and will be described later.

The microcomputer 25 also controls general air conditioning performed by a car air conditioner, and is also connected to various air conditioning sensors for detecting data for this purpose. As the air conditioning sensor, for example, a water temperature sensor that detects the temperature of engine cooling water, a refrigerant temperature sensor that detects the temperature of the refrigerant circulating inside the evaporator 8, an inside air sensor that detects the temperature in the cabin, and a temperature of the outside air An outside air sensor for detecting, an insolation sensor for detecting the amount of insolation, and the like are listed.

The overall configuration to which the control device for a car air conditioner according to the present embodiment is applied has been described above.

The operation of the control device for a car air conditioner according to the present embodiment having the above-described configuration will be described below.

The control device for a car air conditioner according to the present embodiment incorporates blower fans 4 and 5 and controls the car air conditioner to which power is supplied by turning on the IG switch 32 of the vehicle. And
An ST switch 33 that is a starter motor drive detection unit that detects the drive of a starter motor provided in the automobile;
While the ST switch 33 detects the drive of the starter motor, the car air conditioner is stopped or the blowing fans 4 and 5 are turned off.
And a microcomputer 25 which is a blower fan control means for reducing the rotation speed of the microcomputer.

That is, when an ON signal is output from the ST switch 33, it is input to the microcomputer 25. ST
The microcomputer 25 that has input the ON signal of the switch 33
When the T-system is turned on, the blower fans 4 and 5 of the car air conditioner in the operation unit 32 are stopped or the rotation speed is reduced.

As shown in FIG. 2, the power supply system of the ACC system is turned off when the ST switch 33 is turned on. Therefore, the ACC switch 31 may be used as the starter motor drive detection means, and the car air conditioner may be stopped by detecting this off signal.

The processing of the control device for a car air conditioner according to the present embodiment described above is summarized in a flowchart in FIGS. 3 and 4, and will be described below. FIG. 3 is a flowchart illustrating a process of detecting the start of power supply of the ST system by turning on the ST switch, and FIG. 4 is a flowchart illustrating detecting the start of power supply of the ST system by turning off the ACC switch.

First, when the microcomputer 25 detects that the IG switch is turned on (S1), the microcomputer 25 determines whether or not the car air conditioner power supply in the operation unit 32 of the car air conditioner is turned on. Turn on the air conditioner (S
3). Subsequently, the ON of the ST switch is detected (S4), and when this is detected, the car air conditioner (only the fan may be used) is turned off (S5).

The starter motor is configured to rotate only for a relatively short time from when the engine starts rotating until a complete explosion occurs. Therefore, next, the stop of the starter motor is detected by the OFF signal of the ST switch (S6), and if the ST switch is off, the car air conditioner (only the fan may be used) is turned on (S7).

Next, it is determined whether or not the switch of the car air conditioner has been input from the operation unit (S8). At this time, if the car air conditioner is turned off, the car air conditioner is turned off (S
9). At this time, control may be performed so that the rotation speed of the fan motor of the car air conditioner is set to the minimum value.

Thereafter, when it is detected that the IG switch is turned off by the key cylinder switch (S10), the system is terminated and the processing is terminated (S11).

FIG. 4 is a flow chart for explaining the processing in the case where the OFF of the ACC switch is used as the starter motor drive detecting means instead of the ON of the ST switch.
The process of step 4 in FIG. 3 described above is replaced by a process of determining the OFF signal of the ACC switch (S24), and the process of step 7 is replaced by a process of determining the ON signal of the ACC switch (S27). Figure 3 except for the points
Performs the same processing as in the flowchart of FIG.

According to the above-described embodiment, the car air conditioner can be automatically stopped by the microcomputer 25 when the starter motor is driven. Therefore, the battery can supply sufficient electric power to the starter motor, and can obtain sufficient rotation torque of the starter motor for starting the engine.

Further, the present embodiment realizes a configuration in which the fan is stopped or the rotation speed is reduced while the starter motor is driven by using a microcomputer.
According to such a configuration, it is possible to easily prevent a decrease in torque due to the car air conditioner at the time of starting the engine simply by attaching the car air conditioner to the car, and it is possible to provide a user-friendly car air conditioner control device.

<Embodiment 2> The car air conditioner control device according to the present embodiment has a built-in blower fan and controls a car air conditioner to which power is supplied by turning on an IG switch 32 of the car. An ACC switch 31, which is a control device, which is a starter motor drive detection unit that detects the drive of a starter motor provided in an automobile, and stops the fan motor while the ACC switch 31 detects the drive of the starter motor, Or a fan control circuit 21 which is a blower control unit for reducing the rotation speed of the fan.

FIG. 5 shows an overall configuration to which the car air conditioner control device according to the second embodiment of the present invention is applied. The configuration shown is substantially similar to that shown in FIG.
The fan motor 5 is controlled by the fan control circuit 21, and the outputs of the ACC switch 31, the IG switch 32, and the ST switch 33 that output the power supply states of the ACC system, the IG system, and the starter system are also transmitted to the fan control circuit 21. The point of input is different from that of the first embodiment.

Hereinafter, the configuration of the present embodiment will be described.

FIG. 6A is a schematic diagram for explaining selection of each of the ST system, the IG system, and the ACC system by the key cylinder switch. The switch S1 and the switch S2 connected to the 12V battery are linked, and when the key is turned to the position of the ACC switch 31, only the switch S1 selects the ACC system. Therefore, at this time, electric power is supplied to the vehicle only to the ACC system.

When the key is turned to the position of the IG switch 32, the switch SI selects the IG system, and the switch S2 switches to the A position.
Select CC system. Therefore, at this time, the car
Electric power is supplied from the C system and the IG system.

When the key is further turned to the position of the ST switch 33, the switch SI selects the ST system and the switch S2 selects the IG system. Therefore, at this time, ST
Power is supplied from the system and the IG system,
It is separated from the system. That is, the ACC switch 31 is turned off only when the ST switch is turned on. Thus, in the present embodiment as well, it is possible to detect the drive of the starter motor by turning off the ACC switch.

Note that the signals A, B, and C in FIG.
A signal indicating that the ST system has been selected, a signal indicating that the IG system has been selected, and a signal indicating that the ACC system has been selected, respectively.

FIG. 6B is a diagram for explaining control based on the signal output in FIG. 6A. As shown in the figure, electric power is distributed from a battery to a starter motor M of the ST system, an engine 51 of the IG system, a car air conditioner 52, and electrical components 50 supplied from the ACC system. A relay r1 is provided before the starter motor M, and a relay r2 is provided before the engine 51.
However, r3 is connected in front of the car air conditioner 52, and the relay 4 is connected in front of the electrical component 50. Relays r1, r2, r
3 comprises a contact ss and a coil c.
The contact ss is turned on and off by energizing and stopping energizing c.

When the key is at the position of the IG switch 32, the switch S1 selects the IG system and the switch S2 selects the ACC system. At this time, as shown in FIG. 6B, the signal B is input to the relay 2 and the signal C is input to the relay r4. The relay r2 is turned on when the coil cc is energized, and power is supplied from the battery to the engine 51 and the car air conditioner 52. The signal C turns on the contact ss by energizing the coil cc of the relay r4, and supplies electric power to the electrical component 50.

Next, when the key is at the position of the ST switch 31, the ST system is selected by the switch S1, and the IG system is selected by the switch S2, and the signal A and the signal B are output, and the signal C is not output. By stopping the signal C from being output,
The contact ss of the relay r4 is turned off, and the supply of power to the electrical component 50 stops.

The signal A indicating that the ST switch 33 has been selected energizes the coil cc of the relay r3 and turns off the contact ss, so that the power supply to the car air conditioner 52 is stopped, and the car air conditioner of the IG system is turned off. Only stop.

If the power supply system to the car air conditioner 52 is further divided and the power supply system to the fan motor 5 is separated from other power supply systems such as a compressor, only the power supply to the fan motor in the car air conditioner 52 is stopped. I do. Also, PW
By combining with an M control circuit or the like, it is also possible to switch the rotation speed of the fan motor.

FIG. 7 shows a configuration in which the relay r8 in front of the car air conditioner 52 is turned off by a signal C indicating that the ACC switch 31 has been turned off, instead of the signal A indicating that the ST switch has been selected. FIG. 3 is a diagram illustrating a fan control circuit.

That is, when the ACC switch 31 is selected, the signal C is supplied to the coil cc and the relay r
No. 8 contact ss is on. When the ACC switch 31 turns off and the output of the signal C stops, the electromagnetic force generated in the coil cc disappears, the contact ss turns off, and only the car air conditioner of the IG system stops.

In such a configuration, the power supply system to the car air conditioner 52 is further divided so that the fan motor 5
If the power supply system for the vehicle is separated from other power supply systems such as a compressor, only power supply to the fan motor in the car air conditioner 52 is stopped. Also, by combining with a PWM control circuit or the like, it is possible to switch the rotation speed of the fan motor.

According to the above-described embodiment, the fan control circuit 21 can automatically stop the fan or reduce the rotation speed when the starter motor is driven. Therefore, the battery can supply sufficient electric power to the starter motor, and can obtain sufficient rotation torque of the starter motor for starting the engine.

Further, the present embodiment realizes a configuration in which the fan motor is stopped or the rotation speed is reduced while the starter motor is driven by using the fan control circuit. According to such a configuration, even when such a control device is not built in the car air conditioner, it is possible to prevent a decrease in torque due to the car air conditioner at the time of starting the engine by changing the circuit. , A car air conditioner control device that can be retrofitted to the vehicle.

[0054]

According to the car air conditioner control device of the present invention, the drive of the starter motor is detected by turning on the starter switch, and when the starter motor is driven, the fan motor is stopped or the rotation speed is reduced. The rotation torque of the starter motor sufficient for starting can be given to the engine, and the startability of the vehicle can be prevented from lowering.

Since the car air conditioner is automatically stopped, it is possible to prevent the use of the car air conditioner from being impaired by adding a process for controlling the fan.

According to the second aspect of the present invention, the drive of the starter motor is detected by turning off the accessory switch, and when the starter motor is driven, the fan motor is stopped or the rotation speed is reduced to reduce the engine speed. The rotation torque of the starter motor sufficient for starting can be given, and the startability of the vehicle can be prevented from lowering.

Since the car air conditioner is automatically stopped, it is possible to prevent the use of the car air conditioner from being impaired by adding a process for controlling the fan.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an overall configuration to which a control device for a car air conditioner according to a first embodiment of the present invention is applied.

FIG. 2 is a diagram illustrating a relationship between a key cylinder switch and each electric system according to the first embodiment of the present invention.

FIG. 3 is a flowchart illustrating a process of detecting a start of power supply to an ST system by turning on an ST switch according to the first embodiment of the present invention;

FIG. 4 is a flowchart illustrating a process of detecting a start of power supply to an ST system by turning off an ACC switch according to the first embodiment of the present invention.

FIG. 5 is a diagram showing an overall configuration to which a control device for a car air conditioner according to a second embodiment of the present invention is applied.

FIG. 6A is a schematic diagram for explaining selection of each of an ST system, an IG system, and an ACC system by a key cylinder switch according to the second embodiment of the present invention;
FIG. 4 is a diagram for explaining control based on the signal output in FIG.

FIG. 7 is a diagram illustrating another control based on the signal output in FIG. 6A in Embodiment 2 of the present invention.

[Explanation of symbols]

21 ... Fan control circuit (blower fan control means) 25 ... Microcomputer (blower fan control means, accessory switch off detecting means) 31 ... Accessory switch 32 ... ignition switch 33 ... starter motor switch (starter motor drive detecting means) 52 ... car air conditioner M: Starter motor

Claims (2)

[Claims] 1. A built-in blower fan (4, 5),
A car air conditioner control device for controlling a car air conditioner (52) to which electric power is supplied by turning on an ignition switch (32) of a car, comprising: a starter motor for detecting driving of a starter motor (M) provided in the car. While the drive detection means (33) and the starter motor detection means (33) detect the drive of the starter motor (M), the car air conditioner (5)
2) Stop the blower fan (4, 5) built in, or
Or a blower fan control means (21, 25) for reducing the rotation speed of the blower fans (4, 5). 2. A built-in blower fan (4, 5),
A car air conditioner control device for controlling a car air conditioner (52) to which electric power is supplied by turning on an ignition switch (32) of a car, the accessory switch detecting an off state of an accessory switch (31) provided in the car OFF detection means (2
5) While the accessory switch-off detection means (31) detects that the accessory switch (31) is off, the blower fans (4, 5) built in the car air conditioner (52) are stopped or Or a blower fan control means (21, 25) for reducing the rotation speed of the blower fans (4, 5).