| 摘要 |
PROBLEM TO BE SOLVED: To provide a control device of an internal combustion engine capable of preventing inconvenience such as a torque fluctuation, fouling and the deterioration in an EGR system and an intake system by restraining a phenomenon of recirculation of unburnt fuel discharged by post-injection to the intake side in response to EGR control. SOLUTION: This control device of the internal combustion engine is constituted so that only exhaust gas of a # 4 cylinder is recirculated to the intake side as EGR gas. In EGR recirculation, when performing the post-injection for purging NOx of an NOx catalyst 10, HC and CO are secured by controlling #1 to #3 cylinders in the rich air-fuel ratio, and the #4 cylinder is controlled in the lean air-fuel ratio, and the unburnt fuel recirculated to the intake side together with the EGR gas is restrained. COPYRIGHT: (C)2007,JPO&INPIT
|
