JPH0441091B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to control of an air mix door of a vehicle air conditioner.

Conventional configuration and problems thereof Conventionally, in this type of air conditioner, as shown in FIG. 1, the air sent out from the blower motor 1 is
Air passes through the evaporator 2, air mix door 3, and heater core 4, and is blown out from each outlet by a mode door 5 that changes the blowing direction. The air mix door 3 is operated by the control unit 7 based on the signal from the operation unit 6.
and is rotated by rotating the motor actuator 8. Also, motor actuator 8
The air mix door 3 is stopped at a specified position by the position detecting section 9. The motor actuator 8 is
They used to be composed of DC motors, but recently stepping motors, which rotate by a fixed angle for each pulse, are also being used.

However, the above-described configuration has problems in terms of space for mounting the position detection device and reliability, and is disadvantageous in terms of cost.

Purpose of the invention The present invention solves the above-mentioned conventional problems.
One of the objectives is to improve reliability.

Structure of the Invention In order to achieve this object, the present invention comprises a stepping motor as a motor of a motor actuator, is equipped with a temperature setting device and a control device, and the control device is configured to respond to an output signal of the temperature setting device. an initial setting means for selecting an initial setting of cold air side or warm air side; and an initial setting means for generating a pulse in the direction of the position selected by the initial setting means for a certain period of time, and then generating a pulse to return to the position indicated by the temperature setting device. The apparatus is provided with a pulse generating means for generating a pulse, and thereafter generating a pulse according to the output signal of the temperature setting device.

With this configuration, there is no need to provide a position detection device, and a highly reliable, space-saving, and low-cost air conditioner can be realized.

DESCRIPTION OF EMBODIMENTS The present invention will be described below with reference to FIG. 2, which shows an electric circuit diagram of an embodiment thereof, and FIG. 3, which shows a flowchart.

In FIG. 2, 10 is an ignition switch, which is connected to the positive side of the battery 11 and the control device 12.
connected to the power supply circuit. A temperature setting device 13 that rotates the air mix door to an arbitrary position to change the mixing ratio of cold and hot air is input to the control device 12, and a stepping motor 14 that constitutes a motor actuator that rotates the air mix door is connected as an output. has been done. Stepping motor 1
Reference numeral 4 rotates by a fixed angle for each pulse, and by determining the number of pulses based on the position of the temperature setting device 13 and determining the rotation angle of the stepping motor 14, the position of the air mix door is determined.
The operation will be explained with reference to FIG. 3 which shows this flowchart. First, when the power is turned on, it is determined whether the initial settings have been completed or not based on whether the mix flag is 0 or 1. In the initial state, that is, the mix flag is 0.
At this time, it detects whether the temperature setting device 13 is on the warm air side or the cold air side, and if it is on the warm air side, it generates a pulse in the warm air direction for a certain period of time, and then returns to the normal position. , when it is on the cold air side, it generates a pulse in the cold air direction for a certain period of time and then returns to its normal position. After the above initial settings are completed, the mix flag is set to 1, the resistance value of the temperature setting device 13 is detected, and the normal operation is started in which the stepping motor 14 is stopped at a designated position. Since a stepping motor is used as the motor actuator, once the initial settings are made, pulse control can be used to reliably and precisely stop the machine at the desired position. If the initial setting position is set to one position, not only will the initial setting take a long time, but the temperature will change significantly, causing problems such as poor feeling.

Effects of the Invention As is clear from the above embodiments, according to the present invention, the vehicle air conditioner adjusts the temperature by changing the mixing ratio of cold air and warm air by rotating the air mix door, and the air mix door is activated by the motor. Further, the motor actuator is constituted by a stepping motor, and is equipped with a temperature setting device for setting the temperature and a control device for driving the motor actuator. initial setting means for selecting an initial setting of a cold air side or a warm air side according to an output signal of the temperature setting device;
A pulse is generated for a certain period of time in the direction of the position selected by the initial setting means, and then a pulse is generated at the position of the output signal of the temperature setting device, and after the initial setting is completed, a pulse is generated in accordance with the output signal of the temperature setting device. This device is equipped with a pulse generating means that generates a It has various advantages such as high reliability because it can be realized.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a vehicle air conditioner showing a conventional example, FIG. 2 is a circuit diagram showing an embodiment of the present invention, and FIG. 3 is a flowchart of the same. 12...Control device, 13...Temperature setting device, 14
...Stepping motor.

Claims (1)

[Claims] 1. It has an air mix door that adjusts the temperature by changing the mixing ratio of cold air and warm air, and a motor actuator for rotating the air mix door, and the motor actuator is configured with a stepping motor, and the air mix door adjusts the temperature. and a control device for driving the motor actuator, and the control device is provided with an initial setting of a cold air side or a warm air side according to an output signal of the temperature setting device when the power is turned on. an initial setting means for selecting the air mix door, generating a pulse for a certain period of time in the direction of the position selected by the initial setting means, and then generating a pulse to return the air mix door to the position of the output signal of the temperature setting device; The vehicular air conditioner is provided with a pulse generating means that generates a pulse according to the output signal of the temperature setting device after the temperature setting device is finished.