JPH0126491Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial field] The present invention relates to a vehicle air conditioner, and particularly to a control means for an actuator. [Prior Art] In general, air conditioners for vehicles have various air control doors such as an inside/outside air switching door, an air mix door that mixes and adjusts cold air and warm air, and a mode switching door. Each actuator is controlled by a control means to obtain optimal conditioned air. As a control means for controlling this actuator, the greater the degree of freedom in the stop position, the more appropriate door adjustment can be made.In the past, the internal switch had to be replaced each time to increase the degree of freedom. . Another difference is that the control means is electrical and the actuator is mechanical, and the conventional control means is disposed separately from the actuator body. [Problems to be solved by the present invention] However, conventional vehicle air conditioners have the following problems:
As disclosed in Japanese Utility Model Publication No. 60-2010, not only does the control means itself have the disadvantage of being complicated and large in size, but also because the control means is not integrated with the actuator. When used for mode switching, there is no flexibility in the stop position of the operation, so it had to be replaced. It also has the disadvantage of increasing costs. [Means for Solving the Problems] The present invention integrates an actuator and its control means. This increases the versatility of the actuator and makes the entire device more compact and inexpensive. [Operation] The actuator drives and controls the air control door by the rotation of the motor, and the control means integrated with the actuator controls the rotation of the motor.
Integration of the actuator and control means simplifies the configuration of such a control system. [Present Embodiment] FIG. 1 is a sectional view of essential parts showing an embodiment of a vehicle air conditioner according to the present invention. In the same figure, 1 is a motor, 2 is this motor 1
3 is an output gear meshed with this worm gear 2, 4 is an output shaft of this output gear 3, 5 is a housing of the actuator, 6 is a worm gear attached to a rotating shaft of
is a control means built into this housing 5, which will be described later. Further, 10 is a link mechanism connected at one end to the output shaft 4, and 11 is an air control door connected to the other end of this link mechanism 10. FIG. 2 is a circuit diagram showing the control means 6,
The same reference numerals are used for the same parts as in the previous figure. In the figure, 20 is a motor drive circuit that drives the motor 1 in forward and reverse directions, and includes four transistors 21 to 2.
It has 4. Note that each of the diodes 25-28 is for electric braking of each transistor 21-24. 30 is a potentiometer that detects the position of the air control door 11 (shown in FIG. 1) through the rotation of the actuator motor 1, and 40 is a signal between the output signal Vx from this potentiometer and the target position signal Vt. Difference component detection means (differential amplifier) for detecting a difference; 50 is the output Vo of this difference component detection means 40;
This is a comparison control means for controlling the motor drive circuit according to the motor drive circuit, and has two comparators 51 and 52. To explain the operation of this embodiment with the above configuration, the comparators 51 and 52 of the comparison control means 50 are set to Hi or Lo depending on the output Vo of the difference component detection means 40.
Output. This combination of outputs turns on each transistor 21 to 24 of the motor drive circuit 20.
The motor 1 is controlled to be OFF, and the combination of ON and OFF causes the motor 1 to perform forward, reverse, and stop operations.
The above relationship is shown in the table below.

〔effect〕

Conventionally, one input line was always required for each stop position, but in the present invention, only three input lines are required at all times.
Further, as explained above, according to the present invention, since the actuator and its control means are integrated, the structure of the entire device can be made compact and costs can be reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view of essential parts of an embodiment of a vehicle air conditioner according to the present invention, and FIG. 2 is a circuit diagram showing control means of the embodiment. DESCRIPTION OF SYMBOLS 1... Motor, 6... Control means, 11... Air control door, 20... Motor drive circuit, 30... Potentiometer, 40... Difference component detection means, 50
...comparative control means.

Claims (1)

[Claims for Utility Model Registration] (1) A vehicle air conditioner comprising an actuator consisting of a motor that drives a drive element such as a mode switching door, and a control means for controlling the actuator, An air conditioner for a vehicle characterized by integrally incorporating means. (2) The air conditioner for a vehicle according to claim 1, wherein the control means is built into the actuator. (3) The control means includes a motor drive circuit that drives the motor in forward and reverse directions, a potentiometer that detects the position of the drive element, and a difference between an output signal from the potentiometer and a target position signal. The air conditioner for a vehicle according to claim 1, characterized in that the air conditioner comprises a difference component detection means for detecting a difference component, and a comparison control means for controlling the motor drive circuit according to the output of the difference component detection means. .