Protecting device for car air conditioner
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United States of America Patent
Stats
-
Aug 3, 1999
Grant Date -
N/A
app pub date -
Mar 30, 1998
filing date -
May 19, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A protecting device for a car air conditioner includes a timer for timing a period of the rise in the level of a rotation signal delivered from a rotation sensor for detecting a rotational speed of a compressor with the signal being distinguished from noise. On the basis of the obtained period, a judgment is made as to whether rotation of the compressor is in an abnormal state. An electromagnetic clutch between the compressor and a car engine is controlled on the basis of the judgment. The protecting device is mounted on a housing of the compressor with the rotation sensor so that wiring is executed only in an engine room. The protecting device includes a state holding device for memorizing the abnormal state of the rotation of the compressor. The air conditioner can restart on condition that a conscious operation is performed to reset the state holding device.
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