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With increasing pressure for reduction in CO2 emissions and stricter fuel targets from road vehicles, OEMs around the globe have to electrify their vehicle range to meet increasingly challenging emission standards in recent years and new transmission technologies are gaining more attention in different main markets. The actual and future powertrain development has three major directions in order to reduce or avoid emissions in the transportation sector: Hybrid Vehicles: Hybrid Electric Vehicles (HEV), Plug-in HEV (PHEV) Electric Vehicles (EV); Range Extender Electric Vehicle (REEV); Fuel Cell Electric Vehicles (FCEV), Range Extender FCEV (REFCEV). This paper presents a new type Hybrid transmission which is called “DHT (Dedicated Hybrid Transmission)” technology for cost-effective HEVs and PHEVs; it permits the design of very compact automatic transmissions with an integrated high-voltage electric motor on the output side of the transmission.

The backlash between engaging components in a driveline is unavoidable, especially when the gear runs freely and collides with the backlash, the impact torque generated increases the vibration amplitude. The power-split hybrid electric vehicle generates output torque only from the traction motor during the launching process. The nonlinear backlash can greatly influence the driveability of the driveline due to the rapid response of the traction motor and the lack of the traditional clutches and torsional shock absorbers in the powertrain. This paper focuses on the launch vibration of the power-split hybrid electric vehicle, establishes a nonlinear driveline model considering gear backlash, including an engine, two motors, a Ravigneaux planetary gear set, a reducer, a differential, a backlash assembly, half shafts, and wheels.