Abstract
A new hybrid power train using variable displacement pump/motor was developed for electric vehicle. It mainly includes engine, brake, clutch, variable displacement pump/motor, hydraulic accumulator, output gear, planetary gear set, controller. The planetary gear set, brake, clutch, output gear, power output shaft are integrated to form power split and coupling mechanism. In this new power train, the hydraulic variable displacement pump/motor is used instead of the electric generator/motor with different operation modes, which are pure hydraulic motor driving, pure engine driving, parallel hybrid driving, and compound hybrid driving.
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