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    • 42. 发明授权
    • Control circuit for a windshield wiper system
    • 挡风玻璃刮水器系统的控制电路
    • US5786676A
    • 1998-07-28
    • US757064
    • 1996-11-26
    • Tomoyuki OgawaIwao Tsurubuchi
    • Tomoyuki OgawaIwao Tsurubuchi
    • B60S1/08B60S1/48G05B5/00
    • B60S1/08B60S1/482Y10S318/02
    • In a control circuit for a vehicle windshield wiper system, a relay energization retaining circuit forms a self-sustaining circuit jointly with a relay drive transistor for driving a wiper relay, and maintains supply of electric current to the wiper motor when the ON signal for the relay drive transistor is terminated as long as the auto stop switch is at the brake position until the auto stop switch subsequently moves on to the drive position. Therefore, when the signal which normally turns on the relay drive transistor is terminated during the time the auto stop switch is at the brake position, because the relay energization retaining circuit keeps the wiper motor running until the auto stop switch changes over from the brake position to the drive position, and the auto stop switch then takes over the task of keeping the wiper motor running until the auto stop switch changes over from the drive position to the brake position, the termination of electric current to the wiper motor always occurs at the time when the auto stop switch changes over from the drive position to the brake position so that the distance or the angular range of the overrunning of the wiper motor is fixed without regard to the timing of terminating the ON signal. Thus, according to the present invention, the rest position of the wiper blade is fixed under all operating conditions.
    • 在用于车辆挡风玻璃刮水器系统的控制电路中,继电器通电保持电路与用于驱动刮水器继电器的继电器驱动晶体管联合地形成自持电路,并且当用于 只要自动停止开关处于制动位置,直到自动停止开关继续移动到驱动位置,继电器驱动晶体管就被终止。 因此,当自动停止开关处于制动位置时,通常接通继电器驱动晶体管的信号终止,因为继电器通电保持电路使刮水器电机运行直到自动停止开关从制动位置转过来 到驱动位置,然后自动停止开关接管保持雨刮器电机运行的任务,直到自动停止开关从驱动位置转换到制动位置,终止到刮水器马达的电流总是发生在 自动停止开关从驱动位置切换到制动位置的时间,使得刮水器马达超越的距离或角度范围是固定的,而不考虑终止ON信号的定时。 因此,根据本发明,雨刮片的静止位置在所有操作条件下都是固定的。