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Occupancy detector apparatus for automotive safety systems

  • US 3,943,376 A
  • Filed: 01/27/1975
  • Issued: 03/09/1976
  • Est. Priority Date: 10/23/1973
  • Status: Expired due to Term
First Claim
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1. Occupant presence detecting means comprising:

  • means forming an occupant sensing capacitor having a first capacitance in the presence of an occupant and a second capacitance in the absence of an occupant;

    means forming a reference capacitor having a capacitance independent of the presence or absence of an occupant;

    means for supplying charging current to said sensing capacitor and said reference capacitor;

    first, second and third terminals;

    charge detecting means responsive to a first signal applied to said first terminal and operative to simultaneously develop second signal at said second terminal which is commensurate with the capacitance of said occupant sensing capacitor and a third signal at said third terminal which is commensurate with the capacitance of said reference capacitor; and

    comparator means responsive to said second and third signals and operative to develop an output signal having a first state when the capacitances of said sensing capacitor and said reference capacitor have a first predetermined relationship, and a second state when said capacitors have a second predetermined relationship.

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