Patent ID: 6932053
Filing Date: 2005-08-23
Classification: F02D,Y02T

Abstract:
1. A control device of an internal combustion engine in which a target base air-fuel ratio is set, and air-fuel ratio dither control is performed by oscillating an air-fuel ratio between a lean side and a rich side with respect to the target base air-fuel ratio, the control device comprising: requested torque calculation means for calculating a requested torque to be generated by combustion of the internal combustion engine based on an accelerator opening degree operated by a driver; MBT estimated torque calculation means for calculating an MBT estimated torque corresponding to minimum advance for the best torque (MBT) in each case; spark timing retard limit estimated torque calculation means for calculating a spark timing retard limit estimation torque corresponding to a spark timing retard limit in each case; and air-fuel ratio amplitude amount calculation means for calculating an air-fuel ratio amplitude amount in the air-fuel ratio dither control based on the calculated requested torque, the MBT estimated torque and the spark timing retard limit estimated torque.