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A control system for a hybrid vehicle including an internal combustion engine, a drive shaft driven by the engine, a generator for converting kinetic energy of the drive shaft to electrical energy to generate electric power, and an electrical storage device for storing electrical energy output from

A control system for a hybrid vehicle including an internal combustion engine, a drive shaft driven by the engine, a generator for converting kinetic energy of the drive shaft to electrical energy to generate electric power, and an electrical storage device for storing electrical energy output from the generator, wherein idling of the engine is detected. An amount of electrical energy to be regenerated by the generator during the idling of the engine is calculated. An output from the generator is calculated based on the amount of electrical energy to be regenerated by the generator. An amount of intake air supplied to the engine is controlled in a manner such that the amount of intake air to be supplied to the engine is increased when the generator regenerates electrical energy during the idling of the engine. And an air-fuel ratio of a mixture supplied to the engine is controlled to a leaner value than a stoichiometric value during the idling of the engine.

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[ What is claimed is:] [1.] A control system for a hybrid vehicle, wherein said hybrid vehicle includes an internal combustion engine, a drive shaft driven by said engine, a generator for converting kinetic energy of said drive shaft to electrical energy to generate electric power, and an electrical

[ What is claimed is:] [1.] A control system for a hybrid vehicle, wherein said hybrid vehicle includes an internal combustion engine, a drive shaft driven by said engine, a generator for converting kinetic energy of said drive shaft to electrical energy to generate electric power, and an electrical storage battery for storing the electrical energy generated by said generator, the control system comprising:idling-detecting means for detecting idling of said engine;regeneration amount-calculating means for calculating an amount of electrical energy to be regenerated by said generator during said idling of the engine detected by said idling-detecting means;output control means for controlling a power output from said generator based on said amount of electrical energy to be regenerated calculated by said regeneration amount-calculating means;intake air amount control means for controlling an amount of intake air to be supplied to said engine in a manner such that said amount of intake air to be supplied to said engine is increased when said generator regenerates electrical energy during said idling of said engine, based on said amount of electrical energy to be regenerated calculated by said regeneration amount-calculating means; andleaning control means for controlling an air-fuel ratio of a mixture supplied to said engine to a value which is leaner than a stoichiometric value when said generator regenerates electrical energy during said idling of said engine, based on said amount of electrical energy to be regenerated calculated by said regeneration amount-calculating means.