Wiper control device with abnormal drain voltage detection

Wiper control device having a controller for outputting a control signal in response to overheating of a wiper motor M, to a first and second field effect transistor FETA,FETB. The wiper motor M is connected between a drain of the field effect transistor and ground and/or between the drain and a pow...

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Bibliographic Details
Main Authors AKIRA SERIZAWA, YUICHI NAKAZAWA, AKIHIKO TORIKOSHI
Format Patent
LanguageEnglish
Published 18.09.2002
Edition7
Subjects
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
PERFORMING OPERATIONS
SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, ORMANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
TRANSPORTING
VEHICLES IN GENERAL
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Summary:Wiper control device having a controller for outputting a control signal in response to overheating of a wiper motor M, to a first and second field effect transistor FETA,FETB. The wiper motor M is connected between a drain of the field effect transistor and ground and/or between the drain and a power supply. The controller comprises a means 21 for detecting a drain voltage of the first or second field effect transistor, a means 22,23 for detecting a short circuit of the drain circuit based on an abnormal detected drain voltage, a means 24 for counting the number of abnormal drain voltages detected, a means 26 for comparing the number of abnormal drain voltages detected with a predetermined value and a means 27 for determining whether the number of short circuits detected reaches a predetermined value. The FET judged to be involved with the occurrence of a short circuit is thereby halted.
Bibliography:Application Number: GB20010027150