JPH0624881Y2 - Control device with abnormality detection function - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a control device having an abnormality detection function, and in particular, a function of preventing the operation from being restarted without removing the cause of the abnormality after the stop operation due to the abnormality detection. The present invention relates to a control device having.

[Conventional technology]

An example of a conventional control device having an abnormality detection function will be described with reference to FIG. This device is a control device of a refrigerant compressor in a cooling device of a vehicle air conditioner. As is well known, this type of refrigerant compressor receives part of the power of the engine via the electromagnetic clutch 2. That is, the power switch 1
When power is supplied from the battery 3 to the electromagnetic clutch 2 by turning on, the rotational driving force of the engine is given to the refrigerant compressor through the pulley. Power switch 1 for battery 3
The control unit 4 is connected via. The control unit 4 includes an abnormality detection sensor 41 and a relay 42.
When an abnormality is detected at, the relay 42 is excited and its contact 4
Open 2-1. The control unit 4 also includes a temperature control system. The temperature control system controls the vehicle interior temperature by, for example, controlling the opening and closing of the contact point 43 according to the vehicle interior temperature to control the on / off of the refrigerant compressor. Abnormality detection sensor 41
As such, for example, an electromagnetic pickup coil is used to detect an abnormality in the number of rotations of the rotating portion of the refrigerant compressor.

[Problems to be solved by the invention]

In this control device, as described above, when the abnormality is detected, the contact point 42-1 is opened and the clutch 2 is de-energized,
Refrigerant pressure machines stop. When the power switch 1 is turned off in this state, the control unit 4 is also de-energized and the contact 42
-1 closes. Therefore, when the power switch 1 is turned on again without removing the cause of the abnormality in the refrigerant compressor, the electromagnetic clutch 2 is re-energized and the refrigerant compressor is started. Of course, if the refrigerant compressor starts, the abnormality detection sensor 4
Since 1 detects the abnormality again, the contact 42-1 is opened and the refrigerant compressor is stopped. However, the refrigerant compressor will be driven in the abnormal state for a certain period of time after the start, that is, until the detection operation time of the abnormality detection sensor 41. This is not preferable because it accelerates the abnormality of the refrigerant compressor.

The present invention is intended to solve the above problems by a simple improvement, and provides a control device having a function of preventing the operation from being restarted after the stop operation due to the abnormality detection without removing the cause of the abnormality. With the goal.

[Means for solving problems]

The present invention comprises a power source, a control unit that operates with the power source, and a controlled unit that operates with the power source and is controlled by the control unit. The control unit includes means for detecting an abnormality in the controlled unit and the abnormality. In a control device having means for controlling power supply to the controlled unit in response to a signal from the detection unit, the power supply to the controlled unit is turned on / off by an independent power switch independently of the control unit. It is characterized in that it is configured as follows.

〔Example〕

An embodiment of the present invention will be described with reference to FIG. The same parts as those in FIG. 3 are designated by the same reference numerals and detailed description thereof will be omitted. In this embodiment, the power switch 1 is connected to the connection point between the battery 3 and the control unit 4 and the contact point 4.
2-1 is inserted and connected, and a reset switch 5 is connected between the battery 3 and the control unit 4.

According to such a configuration, after the reset switch 5 and the power switch 1 are turned on, if the abnormality of the refrigerant compressor is detected by the abnormality detection sensor 41 while the refrigerant compressor is being driven, as in the conventional case,
The contact 42-1 is opened, the power supply to the electromagnetic clutch 2 is cut off, and the refrigerant compressor is stopped. Power switch 1 in this state
Even if is opened, the control unit 4 maintains the operating state. That is,
Power is supplied to the control unit 4 regardless of whether the power switch 1 is opened or closed, and the contact 42-1 is kept closed even after the refrigerant compressor is stopped unless the reset switch 5 is opened. After removing the cause of abnormality of the refrigerant compressor, the reset switch 5 is opened to interrupt the power supply to the control unit 4 and restore the contact 42-1 to the closed state.

By the way, it is the power switch 1 that is used as a main switch in this control device, and the reset switch 5 is used to stop the entire control device for a long time. For this reason, it is desirable that the reset switch 5 is turned on prior to the power switch 1 when the control device is operated, and is not opened in the temporarily stopped state. This is realized in combination with a key switch when used in a vehicle air conditioner as in the embodiment, which will be described below.

Referring to FIG. 2, the key switch 10 of the automobile can be switched from a key insertion position P ₁ to an accessory power (ACC) supply position P ₂ to an operating (ON) position P ₃ , When the engine is started, the position P ₃ is temporarily operated to the START position P ₄ . The key switch 10 is constructed such that the reset switch 5 is closed while the keys are in the positions P ₂ and P ₃ and the power switch 1 is closed only when the keys are in the position P ₃ .

On the other hand, when it is used in another control system, it may be considered that the power switch 1 is installed at a position where the operation panel is easy to operate and the reset switch 5 is installed at a position away from the power switch 1. Needless to say, the part corresponding to the electromagnetic clutch 2 in FIG. 2 is replaced with another device as the controlled part, and various types of abnormality detection sensors 41 are used.

With the above configuration, it is possible to prevent the operation from being restarted only by the operation of the power switch when the controlled part is brought into the operation stop state based on the abnormality detection operation.

[Effect of device]

According to the present invention, it is possible to prevent the controlled part stopped due to the abnormality detection operation from being restarted in an abnormal state with a simple improvement, so that the protection function for the controlled part can be improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, FIG. 2 is a diagram schematically showing an automobile key switch as an application example of the present invention, and FIG. 3 is a schematic configuration of an example of a conventional control device. Fig. In the figure, 1 is a power switch, 2 is an electromagnetic clutch, 3 is a battery, and 4 is a control unit.

Claims (1)

[Scope of utility model registration request] 1. A power source, a control unit which operates by the power source, and a controlled unit which is operated by the power source and controlled by the control unit, wherein the control unit includes means for detecting an abnormality of the controlled unit. In a control device having means for controlling power supply to the controlled unit according to a signal from an abnormality detection unit, a power switch for turning on / off power to the controlled unit is independent of the control unit. A control device having an abnormality detection function characterized by being configured to perform.