PlugIn for All – Cost Efficiency for PHEV Powertrain Based on Dedicated Hybrid Transmission

Authors

Dr.-Ing. K. Sabzewari, M. Vieracker, J. Hofstetter, P. Meerbrei, Vitesco Technologies, Regensburg:

Year

2021

Print Info

Production/Publication ÖVK

Summary

This paper discusses an innovative powertrain approach of Vitesco Technologies for a passenger car Plug-In Hybrid Electric Vehicle (PHEV). The focus lies on higher cost efficiency for the powertrain system in order to make plug-in hybrids more attractive for lower vehicle segments. Key measures are consequent simplification of the combustion engine and transmission by removal of engine turbocharging, drive off elements, mechanical gear synchronization and the reverse gear. The synergies of electrification with two electric machines allow the removal of those functions and components and are used to fulfill the drivability requirements and decontenting of the transmission, which is defined as a Dedicated Hybrid Transmission (DHT). As a result, the new powertrain approach is capable of various driving modes, depending on the driver’s request, by distributing the torque between three available drives in the car. Consequently, fast dynamic response and high driving comfort are achieved in all driving situations. The potential of the described powertrain is presented by applying the solution to a C-segment car demonstrator. A reference car with Double Clutch Transmission (DCT) in the P2 architecture has been used to compare the drivability for various driving maneuvers. This comparison shows that the drivability comfort for the selected driving situation is very similar. Besides, the reduced fuel consumption and CO₂ emission of the Vitesco Technologies DHT concept are very promising. A first CO₂ evaluation shows the high potential of fuel saving despite the simplified powertrain. In the last part, a market price estimation of the powertrain is shown. Here, the comparison demonstrates that Vitesco Technologies' innovative approach can achieve a favorable ratio between price and CO₂ savings.

Number of pages

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