×

Automatic windshield wiper speed control with piezoelectric sensor

  • US 4,527,105 A
  • Filed: 08/30/1983
  • Issued: 07/02/1985
  • Est. Priority Date: 09/02/1982
  • Status: Expired
First Claim
Patent Images

1. A control system for controlling a windshield wiper comprising:

  • rain sensor means for sensing the rate of rain and generating sensor signals indicative of the sensed rain rate;

    means responsively connected to the rain sensor means for generating digital pulses having a frequency corresponding to the sensed rain rate in response to the sensor signals;

    means responsively connected to the means for generating digital pulses for counting the digital pulses and generating a wiper control signal every time a predetermined number of the digital pulses has been counted;

    a signal generator for outputting a constant-frequency digital signal to said counting means, said counting means being responsive to both the number of the digital pulses and the number of pulses in the digital signal in generating said wiper control signal; and

    means responsively connected to the counting means for driving the windshield wiper through one cycle whenever the wiper control signal is generated.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×