Patent ID: 6700213
Filing Date: 2004-03-02
Classification: B60K,B60W,Y02T,Y10S

Abstract:
A control system for a hybrid vehicle with a combustion engine for outputting a driving force, an electric motor for generating power for assisting the output power from the engine, depending on driving conditions, a power storage unit for storing electric energy generated by the motor acting as a generator using the output power from the engine and electric energy regenerated by the motor when the vehicle decelerates, the control system comprising:an output assist determination means for determining, based on a determination threshold value as the standard, whether the power generated by the electric motor is to be used to assist the output power from the engine depending on the driving conditions of the vehicle; an air-fuel controller for changing the air-fuel ratio of the mixture, which is to be supplied to the engine, to a condition leaner or richer than the stoichiometric air-fuel ratio; and a determination threshold value changing means for changing the determination threshold value, depending on whether the air-fuel ratio of the mixture is leaner or richer than the stoichiometric air-fuel ratio.