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Method and apparatus for detecting failure of pressure sensor in internal combustion engine

  • US 5,168,854 A
  • Filed: 08/22/1991
  • Issued: 12/08/1992
  • Est. Priority Date: 08/24/1990
  • Status: Expired due to Term
First Claim
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1. A method of detecting a failure of a pressure sensor provided in association with a cylinder of an internal combustion engine for detecting the pressure therein, said method comprising the steps of:

  • detecting the pressure in said cylinder by means of said pressure sensor to provide a cylinder pressure;

    setting a maximum permissible value and a minimum permissible value for said cylinder pressure;

    comparing said cylinder pressure with said maximum permissible value;

    comparing said cylinder pressure with said minimum permissible value; and

    determining that said pressure sensor suffers from a failure if said cylinder pressure exceeds said maximum permissible value or if said cylinder pressure becomes lower than said minimum permissible value.

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