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Multiplexed vehicle window wiper control

  • US 5,200,676 A
  • Filed: 04/09/1992
  • Issued: 04/06/1993
  • Est. Priority Date: 12/20/1990
  • Status: Expired due to Fees
First Claim
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1. In a window wiper system for an automotive vehicle including a control switch, another wiper control device and a wiper mechanism including a motor, a two-channel time division multiplex controller, said controller comprising:

  • a multiplex encoder and a multiplex decoder interconnected by a conductor extending through the firewall over which a multiplex control signal is applied from the encoder to the decoder;

    the multiplex encoder including means for generating the multiplex control signal as a cyclical waveform containing alternating cycles of different first and second periods wherein the duty cycle of the first period cycles is determined by the other wiper control device and the duty cycle of the second period cycles is determined by the control switch; and

    the multiplex decoder including means for controlling the wiper mechanism in response to the respective duty cycles of the first period cycles and the second period cycles.

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