Refrigeration – With indicator or tester – Position or extent of motion of movable element
Patent
1992-07-21
1996-04-16
Tanner, Harry B.
Refrigeration
With indicator or tester
Position or extent of motion of movable element
62133, 623234, B60H 304
Patent
active
055071520
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a power separating apparatus in an automobile, and more particularly to an apparatus for separating a rotated device rotated by engine power which is transmitted through a driving belt and an electromagnetic clutch, from the driving belt when the rotated device is failed in rotating.
2. Description of the Prior Art
A rotated device in an automobile such as a compressor for air conditioning system, a hydraulic pump or a generator is rotated by engine power transmitted through power transmission means including a driving belt and an electromagnetic clutch.
In the automobile, however, excessive load is applied to the power transmission means when the rotated device is failed in rotating. This results in destroying the power transmission means. In particular, if a plurality of the rotated devices are connected with a single driving belt, the damaged driving belt causes other rotated devices connected with the driving belt to stop.
To solve the problem set forth above, an apparatus has been proposed to separate a rotated device from a driving belt by removing an electromagnetic clutch mounted corresponding to the rotated device when a ratio of a speed of the engine to that of the rotated device becomes a predetermined value.
In the separating apparatus known per se, it is determined whether or not the rotated device is failed, on the basis of the ratio of the speed of the engine to that of the rotated device. Thus, complicated detecting means is required for detecting each speed of the engine and the rotated device and for processing the detected signal. Further, the ratio of the speed of the engine to that of the rotated device is varied according to kinds of the engine and the rotated device, types of the engine and the rotated device, displacement of the engine or the like. Therefore, a failure remedy apparatus should be prepared for each combination of the engine and each rotated device.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a power separating apparatus in an automobile, which can serve without complicated detecting means and is not restricted by any combination of an engine and a rotated device.
A power separating apparatus in an automobile according to the present invention comprises first detecting means for generating a first electric signal having a predetermined voltage level when an engine is actuated, second detecting means for generating a second electric signal having a predetermined voltage level when a rotated device is not actuated, determining means for generating a failure signal indicating a failure of the rotated device depending upon a condition of logical product of the first electric signal and the second electric signal when the rotated device should be actuated, and means for controlling an electromagnetic clutch to separate the rotated device form a driving belt on the basis of the failure signal.
When the engine and the rotated device are normally rotated, the second electric signal is not outputted from the second detecting means while the first electric signal is outputted from the first detecting means. As a result, no failure signal is outputted from the determining means.
On the other hand, if the rotated device stops though the engine is normally rotated and the rotated device should be actuated, the first and second detecting means output the first and second electric signals, respectively. Accordingly, the failure signal can be outputted from the determining means. As a result, the operation of the electromagnetic clutch is stopped and the rotated device which is stopped, can be separated from the driving belt.
According to the present invention, there can be provided a simple detecting apparatus as compared with the apparatus known per se for detecting the rotating speed, since the first and second detecting means respectively generate the first and second electric signals when the engine and the corresponding rotated device are actuated or not. The appa
REFERENCES:
patent: 4697091 (1987-09-01), Tamura
Iwata Shoichi
Kato Shigeki
Kitada Masami
Nakanishi Kazumasa
Kabushiki Kaisha Yunikara
Tanner Harry B.
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