RANGE EXTENDER MODULE TRANSMISSION TOPOLOGY STUDY

• Published in: International journal of automotive technology 2018, 19(5), 104, pp.869-878
• Main Authors: Konrad Herold, Marius Böhmer, Rene Savelsberg, Alexander Müller, Jan Schröter, Jan Karthaus, Un-Jae Seo, Georg Jacbos, Kay Hameyer, Jakob Andert
• Format: Article
• Language: English
• Subjects: 자동차공학
• ISSN: 1229-9138; 1976-3832
• DOI: 10.1007/s12239−018−0084−2

Range extender modules are one option to compensate for short drive ranges of electric vehicles. The close interaction of combustion engine and generator poses new challenges in development. A key requirement for range extender systems is to be light and virtually imperceptible in operation. High-speed electrical machines aim at increasing power density. However, their introduction in a range extender requires a gearbox. The combustion engine torque fluctuations can lead to rattle in the gearbox. The rattle can be overcome by a dual mass flywheel. An interdisciplinary model is developed and used to analyse three different range extender systems: one with a low speed generator without gearbox, one with a high-speed generator, and one with a high-speed generator and a dual mass flywheel. The efficiency was found to be higher for the system with a low speed generator, whereas the power density and the costs are beneficial for the high-speed concept. A dual mass flywheel eliminates the changes of torque direction in the gearbox. It reduces the speed fluctuations of the gearbox and generator by over 90 % compared to the low speed setup. But it increases rolling moment and subsequently chassis excitation compared to a setup with only a gearbox. KCI Citation Count: 1