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VEHICLE INFLATABLE CUSHION ACTUATION AND MONITORING CIRCUIT

  • US 3,714,627 A
  • Filed: 10/20/1971
  • Issued: 01/30/1973
  • Est. Priority Date: 10/20/1971
  • Status: Expired due to Term
First Claim
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1. In a passenger conveyance provided with an inflatable cushion adapted to be actuated by electrically operated actuator means the combination of:

  • an actuation circuit for operating said actuator means and comprising a primary source of direct current, a storage capacitor, switch means connecting said storage capacitor to said primary source for charging said storage capacitor to provide a secondary source of direct current, first and second normally open acceleration responsive switch means connected to opposite sides of said actuator means and forming a series network connected to said primary source and said secondary source, means responsive to loss of said primary source for providing a discharge path through said series network fRom said secondary source, first voltage divider means normally establishing a predetermined voltage at a monitoring junction in said series network, indicator means, monitoring means comprising comparator means including second voltage divider means establishing first and second reference voltages at first and second reference junctions respectively, said comparator means further including first and second semiconductor means responsive to the voltage at said first and second reference junctions respectively and the voltage at said monitoring junction for developing a predetermined output when the voltage at said monitoring junction exceeds said first reference voltage or drops below said second reference voltage, said comparator means further including third semiconductor means responsive to the absence of charge accumulation by said secondary source when initially connected to said primary source by said switch means for developing said predetermined output, additional semiconductor means responsive to said predetermined output of said comparator means for energizing said indicator means.

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