Method for catalyst monitoring using flex fuel
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United States of America Patent
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-
Jun 4, 2002
Grant Date -
N/A
app pub date -
Mar 8, 2001
filing date -
Mar 8, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Method and system are provided for monitoring performance of a catalytic converter coupled to an exhaust of an internal combustion engine supplied with fuel from a fuel tank where the fuel can include a first fuel and second fuel in concentrations that vary from one refueling to the next. A ratio indicative of catalytic converter exhaust gas conversion efficiency is determined from signals provided by an exhaust gas sensor disposed upstream and an exhaust gas sensor disposed downstream relative to the catalytic converter, and a ratio threshold value indicative of a malfunctioning catalytic converter is adjusted in dependence on the concentration of one of the first fuel and second fuel in the fuel in the fuel tank.
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