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AssigneeToyota Jidosha Kabushiki Kaisha
InventorsYasushi IWAZAKI, Toru KIDOKORO, Hiroshi SAWADA, Keiji IMAMURA, Fumihiko NAKAMURA
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An apparatus and a method for detecting abnormal air-fuel ratio variation among cylinders of a multi-cylinder internal combustion engine are provided. The apparatus includes: a catalyst that is provided in an exhaust passage of the multi-cylinder internal combustion engine; a catalyst temperature detection unit that detects a temperature of the catalyst; a catalyst temperature estimation unit that estimates a temperature of the catalyst based on an engine operating state; and an abnormality detection unit that determines whether abnormal air-fuel ratio variation among the cylinders has occurred based on the detected temperature of the catalyst and the estimated temperature of the catalyst.
An apparatus for detecting abnormal air-fuel ratio variation among cylinders of a multi-cylinder internal combustion engine, comprising:
A method for detecting abnormal air-fuel ratio variation among cylinders of a multi-cylinder internal combustion engine that includes a catalyst that is provided in an exhaust passage of the multi-cylinder internal combustion engine and a catalyst temperature detection unit that detects a temperature of the catalyst, comprising:
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