| 摘要 |
PROBLEM TO BE SOLVED: To excellently perform a fuel cut, while restraining the high temperature deterioration in a catalyst. SOLUTION: In this fuel injection control device, even if a fuel cut condition is realized (S310=Yes), when the catalyst bed temperature Tc is higher than Tc0 (S350=Yes), the performance of the fuel cut is delayed. In this case, the target air-fuel ratio AFt in a fuel cut delay period is set in the lean air-fuel ratio AFt_lean (S360). At this time, reaction heat is restrained when removing unburnt HC in exhaust gas, and oxygen storage in the catalyst is gently performed. Thus, generation of sudden oxygen storage reaction is effectively restrained when starting the fuel cut. Thus, the high temperature deterioration in the catalyst can be minimized. COPYRIGHT: (C)2009,JPO&INPIT
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