For passenger cars two hybrid concepts are introduced to the market: the parallel concept and the torque split concept. The torque split concept needs a special transmission with two electric motors. The parallel concept uses existing transmission types and usually one electric motor. That technology has some advantages, which the paper explains with some examples. One necessary condition for a wide use of hybridization is to implement the technology without adding additional length or width to the driveline to have only minor modification to the packaging. To fulfill this demand for full hybrids, i.e. for systems with the function of electric driving, it is necessary to implement the electric machine, a torsional damper device, a clutch to disconnect the combustion engine from the power train, and a launch device in existing automatic transmissions. The parallel hybrid concept has the best cost utilization for a full hybrid application. A parallel hybrid concept is presented which needs no additional axial space compared to a standard transmission. The system is based on a standard ATM (Automatic Transmission), where the torque converter is replaced with a hybrid module. This module consists of a torsional damper, a clutch to disengage the combustion engine from the electric machine and the electric machine itself. The launch device is now a modified clutch clement in the transmission housing. Special efforts were taken to design the hybrid module in the limited space of the former torque converter. The electric machine was optimized to integrate the clutch into its inner diameter. Driving performance was calculated for two identical cars, one with standard ATM, the other with hybrid ATM. The results show that well designed hybrid vehicles reach the same level of driving performance as conventional ATM systems with torque converter without requiring additional transmission length.
Hybrid module from ZF Sachs, the space optimized hybridization of the 8-P automatic transmission
Hybridmodul von ZF Sachs, die raumoptimierte Hybridisierung des 8-P-Automatikgetriebes
2008
12 Seiten, 8 Bilder
Conference paper
English
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