Engine control system and method for hybrid vehicle

摘要

An engine control system for hybrid vehicles, so as to smoothly switch the driving operation from the cylinder-deactivated engine operation, in which at least a part of the total number of cylinders of the engine is deactivated, to the all-cylinder-activated engine operation while considering the driver's intention. When the vehicle is decelerated, the cylinder-deactivated engine operation is performed and regeneration using the motor is performed. The system includes a cylinder deactivation release determining section for releasing the cylinder-deactivated engine operation when an engine speed decreases to a reference engine speed with respect to the cylinder-deactivated engine operation; and a brake operation detecting section for detecting whether a brake pedal is depressed. The cylinder deactivation release determining section includes a cylinder deactivation condition changing section for changing the reference engine speed according to whether the brake pedal is depressed, which is detected by the brake operation detecting section.