This paper introduces the system architecture, the basic functionality, and the available operating modes of a parallel and an input power split hybrid powertrain topology. The fuel efficiency potential as well as the driving performance of both topologies are compared, using longitudinal vehicle simulations. It is shown that these topologies achieve similar fuel efficiencies. At the same time, the parallel hybrid is capable of delivering a higher maximum wheel torque, which leads to superior driving performance. Simulation-based methods in an early phase of the hybrid electric vehicle development process support the evaluation of different hybrid powertrain topologies. The procedures described in this paper are successfully applied within the powertrain electronics department at Volkswagen. They ensure that the optimum topology according to Volkswagen's hybrid electric vehicle design specifications is chosen. It was shown that the power split topology has an efficiency advantage during inner-city operation, whereas the parallel topology has an advantage during highway and real-world operation. This holds for both hybrid driving, as well as electric driving. With respect to driving performance, the parallel topology is superior.
Fuel efficiency and driving performance comparison of different hybrid powertrain topologies
2013
20 Seiten, 14 Bilder, 3 Tabellen, 3 Quellen
Conference paper
English
Fuel efficiency and driving performance comparison of different hybrid powertrain topologies
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