Patent ID: 6624604
Filing Date: 2003-09-23
Classification: B60S,Y10S

Abstract:
A wiper control device comprising a controller for outputting a control signal, which responds to a drive or halt of a wiper motor, to a first field-effect transistor and a second field-effect transistor,wherein the wiper motor is connected between a drain of the first field-effect transistor and ground or between the drain and a power supply, the first and second field-effect transistors are connected in series between the power supply and ground through the drain, and the controller comprises: drain voltage detection means for detecting a drain voltage of the first field-effect transistor or the second field-effect transistor; short circuit detection means for detecting a short circuit of a drain circuit on the basis of an abnormal value of the detected drain voltage; count means for counting the number of times of the detection of the short circuit; comparison means for comparing the number of times of the detection of the short circuit with a predetermined reference number of times; and judgment means for judging an actual occurrence of the short circuit when the number of times of the detection of the short circuit of the drain circuit consecutively reaches the reference number of times.