JPH049685B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a mode control device for a vehicle air conditioner.

Configuration of the conventional example and its problems As shown in FIG.
The air is blown out from each outlet by a mode door 5 that changes the direction of the air. mode door 5
is rotationally controlled via a position detecting section 7 and a motor actuator 8 in response to a signal from an operating section 6 .

To explain this with reference to FIG. 2, the power source 9 passes through the coils of relays 10 and 11, and
From there, electricity is applied to the ground 12 through the operating section 6. By turning on the switch of the operation unit 6, the relays 10 and 11 are turned on, the motor 13 is energized, and the motor actuator 8 is rotated.

However, the above-mentioned conventional configuration has problems such as poor reliability and stopping accuracy of the position detection device, and furthermore, it is difficult to reduce the size and cost of the device.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to provide a small, low-cost mode control device for a vehicle air conditioner that does not require a position detection device.

Structure of the Invention In order to solve the above problems, a mode control device for a vehicle air conditioner according to the present invention includes a stepping motor as the motor of a motor actuator that rotates a mode door that changes the blowing direction. a control device for pulse-driving the ping motor; power-on detection means for outputting a signal when power-on is detected to the control device; and setting means for predetermining an initial setting position based on a mode position;
mode position detection means for detecting the current mode position by a mode switch that sets the mode position;
When a signal is input from the power-on detection means, a pulse is generated for a certain period of time in the direction of the initial setting position determined by the setting means, and further, in order to set the mode position detected by the mode position detection means. A pulse generating means for generating pulses is provided.

According to this configuration, there is no need to provide the position detection device, and it is possible to provide a small, low-cost air conditioner that has high reliability, high stopping accuracy, and saves space.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 3, 14 is an ignition switch, one end of which is connected to the positive side of a battery 15, and the other end connected to a control device 16.
This control device 16 is provided with a power-on detection means 21 that outputs a signal when power-on is detected, and a setting means 20 that predetermines an initial setting position based on a mode position. Further, the control device 16 is provided with a mode position detecting means 22 that receives a signal from a mode switch 17 that changes the direction of air blowing inside the vehicle interior and detects the current mode position. A switch 17a that instructs air blowing (VENT), a switch 17b that instructs air blowing for both the face and feet (BI-LEVEL), a switch 17c that instructs foot air blowing (HEAT), and a switch that instructs defroster air blowing (DEF). 17d. Further, the control device 16 generates a pulse for a certain period of time in the direction of the initial setting position determined by the setting device 20 when a signal is input from the power-on detection device 21, and Pulse generating means 18 is provided for generating pulses to bring the motor into the mode position detected by , and the motor actuator 19 is rotated by the output of this pulse generating means 18 .

The operation will be explained with reference to FIG. 4 which shows this flowchart.

First, when the power is turned on, the ON position of the mode switch 17 is detected, and a drive pulse is generated for a certain period of time in the VENT direction when the mode switch 17 is at the VENT or BI-LEVEL position, and in the DEF direction when it is at the HEAT or DEF position. At this time, the mode status is set to VENT or
Becomes DEF. Initial settings are performed by intentionally causing a step-out phenomenon at this position. Next, in order to return to the normal position, mode switch 17 is set to BI-
At the LEVEL position, the motor actuator 19, which is in the VENT state, is driven to the BI-LEVEL position by the set number of drive pulses. When the mode switch 17 is in the HEAT position, the motor actuator 19, which was also in the DEF position, returns to the HEAT position.

When the above-described initial setting is completed, normal operation is started in which, when the mode switch 17 changes, a drive pulse is generated at the designated position to activate and stop the motor actuator 19.

In this way, when the power is turned on, the initial setting positions are two at both ends, the face blowing position and the defroster blowing position. It is equipped with a control device that selects one of these, rotates the motor actuator to the selected position, and then returns it to the mode switch position, and has two initial setting positions at both ends. Since the direction of the wind blows automatically changes, there are almost no problems such as poor feeling. It goes without saying that if the initial setting position is set to one position, the indoor air blowing direction will change variously during the initial setting, which may cause problems such as failure or poor feeling. Further, since a stepping motor is used as the motor of the motor actuator 19, once initial settings are made, it is possible to stop at a desired position reliably and with high precision using pulse control. Therefore, it has advantages such as high stopping accuracy and space saving, and furthermore, since it can be realized without providing a conventional position detection device, it is highly reliable, compact, and low cost.

Effects of the Invention As explained above, according to the present invention, in a vehicle air conditioner in which a mode door that changes the air blowing direction is rotated by a motor actuator,
The motor of the actuator is a stepping motor, and the actuator is equipped with a control device that pulse-drives the stepping motor, and a power-on detection means that outputs a signal when power-on is detected, and an initial setting position is determined in advance based on a mode position. When a signal is input from the setting means, the mode position detection means for detecting the current mode position by the mode switch that sets the mode position, and the power supply means, the setting means generates a pulse for a certain period of time in the direction of the initial setting position. and a pulse generating means for generating a pulse to set the mode position detected by the mode position detecting means, which enables reliable initial setting and can be realized without providing a position detecting device. Therefore, it has various advantages such as small size, high reliability, and low cost.

[Brief explanation of drawings]

Figure 1 is a schematic configuration diagram of a conventional vehicle air conditioner, Figure 2 is a circuit diagram of a mode door control circuit of the vehicle air conditioner, and Figure 3 is a vehicle air conditioner according to an embodiment of the present invention. FIG. 4 is a block diagram of the control section of the mode control device of the machine, and FIG. 4 is a flowchart showing the operation of the mode control device. 16...control device, 17...mode switch,
18...Pulse generating means, 19...Motor actuator, 20...Initial setting section, 21...Power-on detection means, 22...Mode position detection means.

Claims (1)

[Claims] 1 The motor of the motor actuator that rotates the mode door that changes the blowing direction is configured with a stepping motor, and is equipped with a control device that pulse-drives the stepping motor, and the control device has a control device that controls when power is detected to be turned on. a power-on detection means for outputting a signal; a setting means for predetermining an initial setting position based on a mode position; a mode position detection means for detecting a current mode position by a mode switch for setting a mode position; Pulse generating means for generating a pulse for a certain period of time in the direction of the initial setting position determined by the setting means when a signal is input, and further generating a pulse for setting the mode position detected by the mode position detecting means. A mode control device for a vehicle air conditioner.