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Vehicle window washer with washer fluid temperature responsive pressure control

  • US 5,012,977 A
  • Filed: 09/18/1989
  • Issued: 05/07/1991
  • Est. Priority Date: 09/18/1989
  • Status: Expired due to Fees
First Claim
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1. A window washer system for a vehicle having a window, the window washer system comprising, in combination:

  • a washer fluid reservoir containing a washer fluid with a viscosity varying inversely with temperature;

    a nozzle directed at the window;

    a conduit from the reservoir to the nozzle;

    a motor driven pump effective to pump washer fluid from the reservoir through the conduit and nozzle to the window, the motor driven pump having a first mode of operation in which it generates a first pump outlet pressure and a second mode of operation in which it generates a second pump outlet pressure less than the first pump outlet pressure;

    a temperature sensor responsive to a temperature in the vicinity of the washer fluid reservoir so as to generate a temperature signal indicative of the temperature of washer fluid; and

    electric circuit means responsive to the temperature sensor to activate the motor driven pump in the first mode of operation with the temperature signal within a first temperature range and to activate the motor driven pump in the second mode of operation with the temperature signal within a second temperature range higher than the first temperature range, whereby the pump outlet pressure is automatically adjusted for the temperature dependent viscosity of the washer fluid.

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