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Vehicle speed sensitive windshield washer control

  • US 4,768,716 A
  • Filed: 12/11/1986
  • Issued: 09/06/1988
  • Est. Priority Date: 12/11/1986
  • Status: Expired due to Term
First Claim
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1. A windshield washer control for a vehicle having an electric motor driven washer pump and a supply of cleaning fluid adapted to be propelled by the pump, when the pump is activated, through a nozzle at a predetermined area of the vehicle windshield, the cleaning fluid after leaving the nozzle being subject to the dislocating effect of air moving across the windshield with vehicle motion to be forced to a lower portion of the windshield than the predetermined area, the degree of dislocation increasing with vehicle speed, the control comprising, in combination:

  • means effective to generate a vehicle speed signal;

    means responsive to the vehicle speed signal to vary the speed of the electric motor driven pump so as to vary the pump pressure with vehicle speed and thus counteract the dislocating effect, whereby the cleaning fluid is propelled to the predetermined area regardless of vehicle speed; and

    timer controlled activation means for the pump, the timer controlled activation means being responsive to the vehicle speed signal to vary the duration of activation of the pump inversely with vehicle speed to counteract the variation of volume flow with varying pump pressure and thus cause a substantially constant volume of cleaning fluid to be applied to the windshield for each activation of the pump.

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