Dinsmore & Shohl LLP
Control apparatus for an internal combustion engine
A control apparatus for an internal combustion engine having an exhaust gas purification device which is arranged in an exhaust passage and includes a NOx storage reduction (NSR) catalyst. The control apparatus, when the air fuel ratio of the air-fuel mixture is shifted from a lean air fuel ratio to the stoichiometric air fuel ratio, determines a predetermined NOx amount so as to be larger when the temperature detected by the first detection unit is high in comparison with when the detected temperature is low, and when the storage amount of NOx in the NSR catalyst is larger than the predetermined NOx amount, performs the rich spike processing and then controls the air fuel ratio to the stoichiometric air fuel ratio, whereas when otherwise, controls the air fuel ratio to the stoichiometric air fuel ratio without performing the rich spike processing.
Toyota Jidosha Kabushiki Kaisha
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Hiroshi Shigeki Toshihiro Kazuhiro
Kobayashi Nakayama Mori Umemoto