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Detecting leakage of engine exhaust gas using exhaust mass flow measurement

  • US 6,993,428 B1
  • Filed: 09/22/2004
  • Issued: 01/31/2006
  • Est. Priority Date: 09/22/2004
  • Status: Active Grant
First Claim
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1. A method of measuring mass flow of exhaust gas through an exhaust system of an internal combustion engine, the method comprising:

  • developing temperature data representing temperature of exhaust gas flowing past a temperature sensor disposed in temperature sensing relation to the exhaust gas flow;

    developing power data representing power required to heat an electric heater disposed downstream of the temperature sensor in heat exchange relation with the exhaust gas flow to a temperature in excess of temperature of exhaust gas flow past the heater; and

    processing the temperature data and the power data according to an algorithm for yielding data representing mass flow of exhaust gas.

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