Environmental-friendliness is in the focus of customers and has become a dominant driver for powertrain electrification. FEV has developed the TwinRex hybrid system to match lowest CO2-targets and real life fuel efficiency at affordable costs. A simplified transmission enables full electric driving as well as series and parallel hybrid operation modes. The internal combustion engine (ICE) is dedicated to these hybrid modes. ICE-Technology investment focuses on high efficiency in relevant operation zones, while simplifying technology is sufficient for operation zones of lower interest in this highly electrified environment. Two general engine concepts, a turbocharged and a naturally aspirated version are compared in detail. The turbocharged 1.5 l 3-cylinder engine version achieves a peak efficiency of 43 % at stoichiometric combustion. The naturally aspirated engine version achieves 42.5 % efficiency with a bigger cylinder displacement. Due to the higher torque of the turbocharged engine, the electric machines, inverters and the battery can become smaller, making the hybrid powertrain with the turbocharged engine not only more efficient, but also cheaper. Insight is also given on how such a turbocharged 3-cylinder engine can achieve best NVH performance and how the TwinRex system supports achievement of the expected Post-Euro 6 emission legislation.
TwinRex – Dedicated Hybrid Engine for a serial-parallel powertrain with excellent cost-value index
Proceedings
2020-08-29
20 pages
Article/Chapter (Book)
Electronic Resource
German
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