Apparatus and method for determining catalyst degradation
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United States of America Patent
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Dec 13, 2011
Grant Date -
Nov 16, 2006
app pub date -
May 12, 2006
filing date -
May 16, 2005
priority date (Note) -
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Abstract
A target air-fuel ratio of exhaust gas is changed back and forth between rich and lean in short periods, and it is determined that the catalyst is degraded when the air-fuel ratio of exhaust gas is lean by the time a predetermined period of time has passed from the time the target air-fuel ratio started to be changed.
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