| 摘要 |
PURPOSE:To secure a good front visual range constantly by detecting a rainfall rate accurately around a car with a rain sensor allowing a wiper to be automatically controlled so as to effect a drive control of the wiper effectively based on the detected rainfall rate. CONSTITUTION:No.1 detection circuit detects a deviation of the resistance value R of a sensor 10 which is outputted through a sensor assembly 20, and then an one-shot drive signal is outputted to a wiper when the deviation is found to exceed the stated deviation standard. No.2 detection circuit 30 outputs a continuous drive signal to a wiper based on the output from a preliminary amplifier 20 when the resistance value R of the rain sensor 10 is found to be lower than the stated resistance standard value. Accordingly, the one-shot drive signal is outputted from No.1 detecting circuit 28 for a case of light rain, and the continuous derive signal is outputted from No.2 detection circuit 30 for a case of heavy rain respectively allowing a wiper motor 94 to be driven.
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