×

Automatic window wiper control

  • US 4,705,998 A
  • Filed: 02/09/1987
  • Issued: 11/10/1987
  • Est. Priority Date: 02/09/1987
  • Status: Expired due to Term
First Claim
Patent Images

1. An automatic wiper motor control system for operating a window wiper motor which operates at least one wiper blade to and fro across window for removing moisture from the area which it sweeps, said motor having a park circuit means for returning said wiper blade to a home location when said wiper motor action is terminated at other than the wiper blade home location comprising:

  • a voltage source;

    a moisture sensor, said moisture sensor comprising a plurality of spaced apart exposed conductive strips positioned within an area of the sweep of said at least one wiper blade;

    a voltage storage means;

    a scanning circuit for sequentially connecting adjacent pairs of said conductive strips, one of said pair to said voltage source and the other of said pair to said voltage storage means;

    a wiper motor operating circuit;

    a voltage sensing means connected between said voltage storage means and said wiper motor operating circuit, said voltage sensing means activates said wiper motor operating circuit when the voltage level of said voltage storage means exceeds a preselected voltage level; and

    a wiper position sensor means positioned along the sweep of said wiper blade and influenced by the blade passing thereacross for activating the operation of said voltage sensing means, whereby a determination is made by said automotive wiper motor control system to operate said wiper motor or terminate said operation.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×