Patent ID: 6662782
Filing Date: 2003-12-16
Classification: F02D

Abstract:
A controller for an internal combustion engine, comprising:lean correcting means for setting a lean correction value for correcting a fuel injection amount by decreasing the fuel injection amount during an operation after a cold start of an internal combustion engine and controlling an air-fuel ratio of the internal combustion engine to be leaner than a stoichiometric air-fuel ratio; engine speed fluctuation detecting means for detecting fluctuations in revolution speed of the internal combustion engine; correction amount calculating means for calculating a correction value for correcting the air-fuel ratio to the rich side on the basis of the engine speed fluctuation detected by the engine speed fluctuation detecting means; final correction value calculating means for calculating a final correction value of this time by selecting either a final correction value of last time or a correction value calculated by the correction amount calculating means as a correction value which suppresses the engine speed fluctuation more; and fuel injection amount correcting means for correcting the fuel injection amount on the basis of the lean correction value and the final correction value.