Plug-In Hybrid Transmission for Mercedes-Benz Passenger Cars: Product Family Mercedes-Benz Hybrid Transmissions, Technical Detail Solutions and a Glimpse into Future

摘要

This paper describes the new Mercedes-Benz Plug-In transmission. The overall architecture of the hybrid system remains basically similar to the full hybrid transmission presented in 2012. Nevertheless the hybrid specific parts are completely redesigned, due to the increased power of the electric motor (85 kW instead of 20 kW) and the increased inertia of the system. As in the 20 kW system rotor and stator of the electric motor both are cooled with transmission oil. The bearing layout and the torsional damping system are modified, corresponding to the different load cases, excitations and inertias. The whole system layout focusses conse-quently on two aspects: fuel efficiency and vehicle package. This paper describes the general design as well as specific details about the cooling system, the wet clutch and the damping system. In addition, a brief comparison between parallel hybrid systems and power split systems is carried out, resulting in conclusions about powertrain architectures.