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Load drive control system for a motor vehicle window

  • US 4,621,223 A
  • Filed: 07/05/1985
  • Issued: 11/04/1986
  • Est. Priority Date: 07/05/1984
  • Status: Expired due to Fees
First Claim
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1. A load drive control system comprisinga d.c. motor for driving a load in a forward and a reverse direction, the motor having a first and a second terminal which feed the motor;

  • a plurality of supply lines which supply a voltage to the motor to energize it;

    first switching means for selectively applying a first or a second potential on the supply lines to the first terminal;

    second switching means for selectively applying the second or the first potential on the supply lines to the second terminal;

    a sensor for detecting the presence of any object which stands in the way to the movement of a load;

    self-hold means for changing the first switching means to a condition in which it applies the second potential to the first terminal in response to a detection signal from the sensor;

    automatic return control means for changing the second switching means to a condition in which it applies the first potential to the second terminal in response to a detection signal from the sensor and subsequently for changing the second switching means to a condition in which it applies the second potential to the second terminal in response to the cessation of a detection signal from the sensor;

    and reset means for resetting the self-hold means.

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