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A control system controls a hybrid vehicle having an engine for rotating a drive axle, an electric motor for assisting the engine in rotating the drive axle and converting kinetic energy of the drive axle into electric energy in a regenerative mode, and an electric energy storage unit connected thro

A control system controls a hybrid vehicle having an engine for rotating a drive axle, an electric motor for assisting the engine in rotating the drive axle and converting kinetic energy of the drive axle into electric energy in a regenerative mode, and an electric energy storage unit connected through a power drive unit to the electric motor, for storing electric energy. The control system has a regenerative quantity determining unit which includes first, second, and third first regenerative quantity establishing units. The first regenerative quantity establishing unit establishes a first regenerative quantity for the electric motor based on a vehicle speed of the hybrid vehicle when the supply of fuel to the engine is stopped upon deceleration of the hybrid vehicle. The second regenerative quantity establishing unit establishes a second regenerative quantity for the electric motor based on a remaining capacity of the electric energy storage unit. The third regenerative quantity establishing unit establishes a third regenerative quantity for the electric motor based on a temperature of the drive control circuit. A pumping loss controlling unit controls pumping losses of the engine based on the first, second, and third regenerative quantities.

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[ What is claimed is:] [1.] A control system for controlling a hybrid vehicle having an engine for rotating a drive axle, an electric motor for assisting the engine in rotating the drive axle and converting kinetic energy of the drive axle into electric energy in a regenerative mode, and electric en

[ What is claimed is:] [1.] A control system for controlling a hybrid vehicle having an engine for rotating a drive axle, an electric motor for assisting the engine in rotating the drive axle and converting kinetic energy of the drive axle into electric energy in a regenerative mode, and electric energy storage means connected through a power drive unit to the electric motor, for storing electric energy, comprising:regenerative quantity determining means including first regenerative quantity establishing means for establishing a first regenerative quantity for the electric motor based on a vehicle speed of the hybrid vehicle when the supply of fuel to the engine is stopped upon deceleration of the hybrid vehicle, second regenerative quantity establishing means for establishing a second regenerative quantity for the electric motor based on a remaining capacity of the electric energy storage means, and third regenerative quantity establishing means for establishing a third regenerative quantity for the electric motor based on a temperature of the power drive unit; andpumping loss controlling means for controlling pumping losses of the engine based on said first, second, and third regenerative quantities established respectively by said first, second, and third regenerative quantity establishing means,wherein said pumping loss controlling means comprises means for minimizing the pumping losses of the engine if any one of said second and third regenerative quantities established respectively by said second and third regenerative quantity establishing means is equal to or greater than said first regenerative quantity established by said first regenerative quantity establishing means.