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ELECTRONIC SEAT SENSING SWITCH

  • US 3,764,861 A
  • Filed: 07/31/1972
  • Issued: 10/09/1973
  • Est. Priority Date: 07/31/1972
  • Status: Expired due to Term
First Claim
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1. In a vehicle, an electronic seat sensing system for determining the presence or absence of an occupant at each seat position comprising:

  • a plurality of seat position electrical circuits each comprising in series a first buffer, a second buffer and an amplifier, one of said circuits operatively coupled to each vehicle seat position to be sensed;

    sensor means operatively coupled to each of said seat positions and responsive to the body capacitance of a vehicle occupant manifesting their presence in said seat position, said sensor means electrically connected to the junction between said first and second buffers respectively in each of said seat position electrical circuits for controlling the input capacitance of said second buffer; and

    an oscillator having its output electrically connected to the input of each of said first buffers in each of said seat position electrical circuits, said oscillator providing a continuous source of pulsating electrical signals independently to each of said first buffers of said electrical circuits for generating an electrical signal from said amplifier according to the response of said sensor means, said oscillator unaffected by the body capacitance of any or all occupants.

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