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Electronic control unit for vehicle having reduced circuit scale

  • US 6,356,821 B1
  • Filed: 08/24/2000
  • Issued: 03/12/2002
  • Est. Priority Date: 08/27/1999
  • Status: Active Grant
First Claim
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1. An electronic control unit which receives an input signal from outside and performs data processing on said input signal to produce an output signal, said electronic control unit comprising:

  • a microcomputer including a first operating portion and a second operating portion both receiving said input signal commonly, and a self check portion for comparing operation result of said first operating portion and said second operating portion and outputting a signal indicating abnormal condition when said operation result do not coincide with each other; and

    a safety control means which switches an output signal thereof from an output signal of said microcomputer to a safe side signal when said signal indicating abnormal condition from said self check portion continues for a time equal to or longer than a predetermined time.

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