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Exhaust leak detection

  • US 5,372,036 A
  • Filed: 11/22/1993
  • Issued: 12/13/1994
  • Est. Priority Date: 11/22/1993
  • Status: Expired due to Fees
First Claim
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1. A method for detecting an exhaust leak in an engine control system having an exhaust gas oxygen sensor upstream of a catalyst and an exhaust gas oxygen sensor downstream of the catalyst and an electronic engine control system for operating an internal combustion engine, including the steps of:

  • monitoring the output voltage signals from the exhaust gas oxygen sensor downstream of the catalyst;

    computing the average output voltages from the exhaust gas oxygen sensor downstream of the catalyst;

    comparing the computed average with respect to a calibrated constant;

    if the average is smaller than the constant, setting a code indicating an exhaust leak; and

    monitoring the output voltage signals from the exhaust gas oxygen sensor upstream of the catalyst determining a leak condition if the upstream exhaust gas oxygen sensor switches rapidly at idle and low engine speeds.

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