| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a wiper motor control circuit for an automobile, improving silence in the automobile, while reducing discomfort caused by operation noise of a relay part. <P>SOLUTION: During intermittent operation of a wiper, a wiper start-up signal output part 16 turns on a wiper start-up relay 11 (bc connection) by supplying power to a wiper start-up relay driving part 13. Thus, a wiper motor 21 starts rotation, and a synchronously operating motor switch 22 is turned on (bc connection). An electric current detecting part 15 detects a reversal position where reciprocating operation of a window wiper is changed, on the basis of a characteristic change appearing in a driving current of the wiper motor 21. A wiper start-up signal control part 17 instructs a wiper start-up signal output part 16 to cut off power to the wiper start-up relay driving part 13 based on the detected characteristic change. The wiper start-up signal output part 16 turns off the wiper start-up relay 11 (ac connection) by cutting of power to the wiper start-up relay driving part 13 in response to the instruction. <P>COPYRIGHT: (C)2012,JPO&INPIT |
