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Exhaust gas recirculation system fault detector

  • US 5,190,017 A
  • Filed: 05/28/1992
  • Issued: 03/02/1993
  • Est. Priority Date: 05/28/1992
  • Status: Expired due to Fees
First Claim
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1. A method of determining a fault in an EGR system includes the steps of:

  • comparing the measured exhaust gas flow through the EGR system to an expected EGR flow;

    determining the period of time that the expected flow of EGR deviates from the measured EGR flow by a calibrated EGR flow amount; and

    indicating a fault condition in the EGR system if the duration of the deviation exceeds a predetermined amount of time.

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