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Windshield wiper system having reduced wipe speed at reversal points using variable frequency induction motor control

  • US 5,642,026 A
  • Filed: 09/30/1994
  • Issued: 06/24/1997
  • Est. Priority Date: 09/30/1994
  • Status: Expired due to Fees
First Claim
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1. A wiper system having reduced wipe speed at reversal points, comprising:

  • an induction motor;

    a wiper assembly operatively connected to said motor for motion when said motor is operated;

    sensing means responsive to a position of said wiper assembly for detecting the position of said wiper assembly and generating a control signal when said wiper assembly is positioned within a preselected range of at least one reversal point;

    a motor control responsive to said control signal for causing said motor to operate said wiper assembly at a first wipe speed when said control signal is in a first state, said motor control being operative to cause said motor to operate said wiper assembly at a second wipe speed when said control signal is in a second state wherein said second wipe speed is less than said first wipe speed, said motor control including a frequency modulator responsive to said control signal for generating a first signal having a first frequency when said control signal is in said first state, and for generating a second signal having a second frequency when said control signal is in said second state, said first and second signals being coupled to said motor to operate said wiper assembly at said first and second wipe speeds, respectively.

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