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Air bag operation device

  • US 5,422,965 A
  • Filed: 02/12/1993
  • Issued: 06/06/1995
  • Est. Priority Date: 02/18/1992
  • Status: Expired due to Fees
First Claim
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1. Method of operating an air bag igniter control apparatus have a crash sensor for detecting a condition indicative that a crash has occurred, a data processor, which evaluates signals from said sensor, and an abnormality indicator apparatus, said method comprising the steps of:

  • said data process continuously performing a self diagnostic function for detecting a failure in the data processor and a memory thereof when no signal is received from said sensor;

    said data processor transmitting an abnormality signal to an abnormality indicator apparatus when a failure is detected;

    wherein said self diagnostic function comprises the steps of;

    executing a first version of a self diagnostic program which includes processing steps for checking for proper operation of at least said data processor, said memory, and a data bus of said data processor, and generating an output signal indicative of said proper operation;

    executing a second version of said self diagnostic program which includes processing steps for checking for proper operation of at least said data processor, said memory, and a data bus of said data processor, and generating an output signal indicative of said proper operation, said processing steps and said output signal of said second version being different from said processing steps and said output signal of said first version; and

    comparing output signals of said first version with output signals of said second version.

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