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A control system for a hybrid vehicle prevents a voltage across an electric energy storage device from dropping excessively when the electric energy storage device is discharged with a generator/motor operating as an electric motor, for thereby effectively utilizing electric energy stored in the ele

A control system for a hybrid vehicle prevents a voltage across an electric energy storage device from dropping excessively when the electric energy storage device is discharged with a generator/motor operating as an electric motor, for thereby effectively utilizing electric energy stored in the electric energy storage device as much as possible to operate the generator/motor as the electric motor. The control system also prevents the voltage across the electric energy storage device from rising excessively when the electric energy storage device is charged with the generator/motor operating as an electric generator, for thereby charging the electric energy storage device with electric energy generated by the generator/motor as much as possible while protecting the electric energy storage device. The control system controls operation of the generator/motor to keep a charging and discharging current of the electric energy storage device at a level equal to or smaller than a limiting value determined depending on the amount of electric energy stored in electric energy storage device and the temperature thereof when the generator/motor operates as the electric generator or motor.

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[ What is claimed is:] [1.]1. A control system for controlling a hybrid vehicle having an engine as a vehicle propulsion source, an electric energy storage device for storing electric energy, and a generator/motor for selectively operating as an electric motor for generating an assistive output to a

[ What is claimed is:] [1.]1. A control system for controlling a hybrid vehicle having an engine as a vehicle propulsion source, an electric energy storage device for storing electric energy, and a generator/motor for selectively operating as an electric motor for generating an assistive output to assist in an output of the engine from the electric energy stored in the electric energy storage device and as an electric generator for generating electric energy to be stored in the electric energy storage device, said control system comprising:generator/motor control means for controlling operation of said generator/motor to maintain a current passing through said electric energy storage device at a level equal to or smaller than a predetermined limiting value established depending on the amount of electric energy stored in said electric energy storage device, when said generator/motor operates as the electric motor, and to maintain a current passing through said electric energy storage device at another level equal to or smaller than another predetermined limiting value established depending on the amount of electric energy stored in said electric energy storage device when generator/motor operates as the electric generator.