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Hybrid vehicle
| Details |
Inventors: Shimasaki, Yuichi; Nakano, Kenji; Fukuchi, Hironao; Takahashi, Hideyuki; Sawamura, Kazutomo; Wakashiro, Teruo;
Assignee: Honda Giken Kogyo Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Camby; Richard M.
Assistant Examiner:
Attorney, Agent or Firm: Armstrong, Westerman, Hattori, McLelland & Naughton
A hybrid vehicle has an engine for propelling the hybrid vehicle, a power transfer mechanism for transferring an output power of the engine from an output shaft thereof to drive wheels of the hybrid vehicle, an electric motor for supplying an assistive output power to assist the output power of the engine through the power transfer mechanism to the drive wheels, and an electric energy storage unit for storing electric energy for energizing the electric motor. The hybrid vehicle also has a controller for controlling operation of the hybrid vehicle with the engine and the electric motor. If the amount of electric energy stored in the electric energy storage unit is greater than a predetermined quantity, the controller controls the electric motor to generate the assistive output power to start the hybrid vehicle with the electric energy supplied from the electric energy storage unit to the electric motor while the engine is idling or stopped. If the amount of electric energy stored in the electric energy storage unit is smaller than the predetermined quantity, the controller controls the engine to generate an output power to start the hybrid vehicle while the electric motor is being de-energized. |
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DETAILED DESCRIPTION It is therefore an object of the present invention to provide a hybrid vehicle which can be started smoothly while preventing an electric energy storage unit from being unduly deteriorated by excessive consumption of electric energy stored therein for energizing an electric motor and also reducing the amount of fuel consumed by an engine.
According to the present invention, the above object can be accomplished by a hybrid vehicle comprising an engine for propelling the hybrid vehicle, the engine having an output shaft, power transfer means for transferring an output power of the engine from the output shaft thereof to drive wheels of the hybrid vehicle, an electric motor for supplying an assistive output power to assist the output power of the engine through the power transfer means to the drive wheels, electric energy storage means for storing electric energy for energizing the electric motor, and vehicle operation control means for controlling operation of the hybrid vehicle with the engine and the electric motor, the vehicle operation control means comprising means for controlling the electric motor to generate the assistive output power to start the hybrid vehicle with the electric energy supplied from the electric energy storage means to the electric motor while the engine is idling or stopped, if the amount of electric energy stored in the electric energy storage means is greater than a predeter- mined quantity, and for controlling the engine to cause the output shaft to generate an output power to start the hybrid vehicle while the electric motor is being de-energized, if the amount of electric energy stored in the electric energy storage means is smaller than the predetermined quantity.
For starting the hybrid vehicle, if the amount of electric energy stored in the electric energy storage means is greater than the predetermined quantity and hence is sufficient enough, then the hybrid vehicle is started with the assistive output power of the electric motor.
At this time, since the electric energy storage means stores a sufficient amount of electric energy for energizing the electric motor, the electric motor is capable of generating an output power necessary to start the hybrid vehicle smoothly, and the electric energy storage means is substantially free of undue deterioration
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