A Novel Architecture of Multimode Hybrid Powertrains for Fuel Efficiency and Sizing Optimization

• Published in: IEEE access Vol. 10; pp. 2591 - 2601
• Main Authors: Kwon, Hyukjoon, Choi, Yeongil, Choi, Woulsun, Lee, Seungwook
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Commercialization; Cost reduction; Dynamic programming; Energy efficiency; Engines; Environmental protection; Environmental testing; Fuel consumption; Fuel economy; fuel efficiency; Gears; Hybrid modes; Hybrid power systems; Hybrid systems; Mechanical power transmission; Optimization; Packaging; power split hybrid transmission; Powertrain; Production costs; Sizing; Synchronization; Wheels
• ISSN: 2169-3536; 2169-3536
• DOI: 10.1109/ACCESS.2021.3139029

Hybrid powertrains have widely been developed as eco-friendly system and commercialized in the passenger vehicle market with clear benefits over conventional powertrains. Accordingly, there have been various research topics on architectures of hybrid power systems to further improve the system performance ability and sizing optimization for the packaging and production cost reduction. In this study, a novel multimode power split hybrid architecture has been suggested, which is based on multiple driving modes such as input- and output-power split and parallel hybrid modes in order to achieve fuel efficiency improvement and sizing optimization. The performance ability and sizing aspects of the invented system have been analyzed in comparison with Toyota Hybrid System (THS), which is a kind of typical power split hybrid architecture. The fuel efficiency of the suggested system has been compared by a backward-facing simulation with Dynamic Programming (DP) for representative driving test cycles from Environmental Protection Agency (EPA). In terms of the component sizing, the maximum torque and speed variation trends of motors have been analyzed according to the velocity variation. In the simulation and analysis results, the invented system shows opportunities to improve fuel efficiency with multiple driving modes and to reduce component sizing of power electronics which is related to the production cost reduction as well as the vehicle packaging space minimization.