Regenerative start procedure for hybrid vehicle

摘要

A hybrid electric vehicle includes an internal combustion engine (11), a multi-speed automatic transmission (13), and an electric machine (14) operable in a motoring mode and a generating mode. A compound planetary gear set (10) operatively couples the engine (11), transmission (13) and electric machine (14). The electric machine (14) is operable during periods of vehicle launch to provide a reaction torque for the planetary gearset (10) such that torque is supplied to the input of the transmission (37) and the reaction torque energy is converted to electrical energy for storage in a vehicle battery pack battery (69). The method employs a combination of open loop torque control and closed loop speed controls responsive to rotational parameters of the vehicle drivetrain including engine speed, electric machine rotor speed and transmission input speed to control the generator torque of the electric machine to thereby produce the reaction torque for accelerating the vehicle and for producing electrical power during the vehicle launch.