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System for controlling activation of air bag for vehicle

  • US 5,101,192 A
  • Filed: 06/20/1990
  • Issued: 03/31/1992
  • Est. Priority Date: 07/11/1989
  • Status: Expired due to Fees
First Claim
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1. A system for controlling the activation of a squib of an air bag for a vehicle, comprising:

  • (a) a battery;

    (b) an energy-reserving capacitor;

    (c) a main electric wire connecting said capacitor to said battery;

    (d) first switching means for controlling the supply of electric current from said capacitor to said squib of said air bag;

    (e) first control means for detecting collision of said vehicle to close said first switching means, thereby supplying electric current to said squib of said air bag to activate said squib;

    (f) a malfunction alarm device;

    (g) an auxiliary electric wire connecting said malfunction alarm device to said battery;

    (h) second switching means for controlling the supply of electric current from said battery to said malfunction alarm device via said auxiliary electric wire;

    (i) second control means for detecting interruption of an electric current path extending between said battery and said capacitor and including said main electric wire, and for intermittently closing said second switching means when said second control means detects said interruption; and

    (j) current control means connected between said capacitor and one end of said auxiliary electric wire connected to said malfunction alarm device, said current control means allowing the electric current to flow only from said auxiliary electric wire toward said capacitor.

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