Evaluation of transmission losses of various Dedicated Hybrid Transmission (DHT) with a lossmap‑based simulation model

摘要

This paper presents a simulation methodology developed at the Institute of Automotive Engineering (IAE). With this simulationmethod, transmission lossmaps can be calculated for Dedicated Hybrid Transmission (DHT). These transmissionlossmaps are considered within the control strategy section of a modular simulation model, which can lead to more realisticsimulation results. Four DHT concepts are investigated using this simulation methodology: three multi-mode DHT (MMDHT)transmission concepts and a Power Split DHT (PS-DHT) concept. All concepts have two electric machines (EM).The first concept is a MM-DHT, which was developed with the transmission synthesis of the IAE. This DHT concept hastwo planetary gear sets (PGS), four shifting elements, and two EM. The other MM-DHT concepts are based on the Voltec2 and the CT6. They also have two EM. The Voltec 2 has two PGS and three shifting elements. The CT6 has three PGS andfive shifting elements. The power split DHT has one PGS and no shifting elements. For the evaluation of the transmissionconcepts, consistent and representative performance requirements are first defined, which must be fulfilled by all concepts.Afterwards, the transmission losses of the individual concepts can be subdivided via the lossmap-based simulation model forthe different loss components. Finally, the DHT concepts are examined and evaluated with regard to mechanical efficiencyand fuel consumption in the WLTC.