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Journal Article

Development of a New Two-Motor Plug-In Hybrid System

2013-04-08
2013-01-1476
A highly efficient two-motor plug-in hybrid system is developed to satisfy the global demands of CO2 reduction. This system switches three operation modes, what is called “EV Drive”, “Hybrid Drive” and “Engine Drive”, to maximize fuel efficiency according to the driving condition of the vehicle. Practical plug-in EV (Electric Vehicle) capability is also realized by adding a high-power on-board charger and a high capacity Li-ion battery to the original system. The outlines of the system components including a newly developed Atkinson cycle engine, a highly efficient electric coupled CVT (Continuously Variable Transmission) with built-in motor and generator, an integrated PCU (Power Control Unit) and an exclusive battery for plug-in HEV (Hybrid Electric Vehicle) are described in this paper. In addition to the switching of three driving modes and the efficiency improvement of each device, cooperative control of the hybrid system is introduced.
Technical Paper

Development of a Novel Parallel Hybrid Transmission

2001-03-05
2001-01-0875
This paper describes the initial research and development of a novel parallel hybrid transmission that incorporates design features found in most production 3- and 4-speed automatic transmissions, except that the mechanism can transmit torque from two power sources to the drive wheels. The transmission functions with a heat engine and a single electric motor/ generator, and uses a Simpson gear set and four automatically controlled clutches. Thirteen modes of operation are possible, including one motor-only mode, three power modes, one CVT/charging mode, four engine-only modes, and four regenerative braking modes. Because the design is based on conventional automatic transmission components, the design is simple, compact, relatively efficient, and reliable.
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