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A control system for a hybrid vehicle includes an internal combustion engine, a drive shaft driven by the engine, a motor having an assisting function of driving the drive shaft by operating on electrical energy and a regenerating function of converting kinetic energy of the drive shaft to electrica

A control system for a hybrid vehicle includes an internal combustion engine, a drive shaft driven by the engine, a motor having an assisting function of driving the drive shaft by operating on electrical energy and a regenerating function of converting kinetic energy of the drive shaft to electrical energy, and an electrical storage device for supplying electrical energy to the motor and for storing electrical energy output from the motor. An amount of remaining charge in the electrical storage device is detected. A driver demanded output of the engine is calculated based on operating conditions of the engine. Running resistance of the hybrid vehicle is calculated based on running conditions of the hybrid vehicle. A required extra output of the engine is calculated based on a relationship between the driver demanded output of the engine and the running resistance of the hybrid vehicle. A desired output of the motor is calculated based on the extra required output of the engine. An operating mode of the motor is determined based on the amount of remaining charge in the electrical storage device and the desired output of the motor. An output from the motor is controlled based on the operating mode of the motor and the desired output of the motor.

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[ What is claimed is:] [1.] A control system for a hybrid vehicle including an internal combustion engine, a drive shaft driven by said engine, a motor having an assisting function of driving said drive shaft by operating on electrical energy and a regenerating function of converting kinetic energy

[ What is claimed is:] [1.] A control system for a hybrid vehicle including an internal combustion engine, a drive shaft driven by said engine, a motor having an assisting function of driving said drive shaft by operating on electrical energy and a regenerating function of converting kinetic energy of said drive shaft to electrical energy, and electrical storage means for supplying electrical energy to said motor and for storing electrical energy output from said motor, the control system comprising:remaining charge-detecting means for detecting an amount of remaining charge in said electrical storage means;engine demanded output-calculating means for calculating a driver demanded output of said engine, based on operating conditions of said engine;running resistance-calculating means for calculating running resistance of said hybrid vehicle based on running conditions of said hybrid vehicle;engine extra output-calculating means for calculating a required extra output of said engine, based on a relationship between said driver demanded output of said engine calculated by said engine demanded output-calculating means and said running resistance of said hybrid vehicle calculated by said running resistance-calculating means;desired output-calculating means for calculating a desired output of said motor, based on said required extra output of said engine calculated by said engine extra output-calculating means;operating mode-determining means for determining an operating mode of said motor, based on said amount of remaining charge in said electrical storage means detected by said remaining charge-detecting means and said desired output of said motor calculated by said desired output-calculating means; andcontrol means for controlling an output from said motor, based on said operating mode of said motor determined by said operating mode-determining means and said desired output of said motor calculated by said desired output-calculating means.