Optimization Design Scheme of Power-split Hybrid Electric Powertrain Configuration with Single Planetary Gear

doi:10.3901/JME.2021.18.264

Abstract

Abstract: The power-split hybrid electric powertrain (PHEP) based on planetary gear can adjust the engine speed and compensate the engine torque by adopting double motors, which makes the fuel economy and emission performance of hybrid electric vehicle (HEV) significantly improved. However, the PHEP with single planetary gear can generate power cycling phenomenon frequently during driving, reducing the overall efficiency of the system. To further improve fuel economy, an optimization design scheme of PHEP configuration with single planetary gear is proposed in this paper. Firstly, the operating characteristic and the topology of output/input PHEP configuration are analyzed, the connection relationship of the two topologies is break up and recombined to generate the basic topology scheme. Secondly, all feasible topologies based on basic topology scheme are explored, and all feasible topologies are combined to generate a new configuration scheme. Finally, the global optimization control strategy based on dynamic programming (DP) algorithm is applied to simulate the best economy and the best dynamic performance of the proposed configuration scheme. The results demonstrate that the optimization design scheme of PHEP configuration with single planetary gear proposed in this paper can effectively improve the vehicle comprehensive operating performance.

Key words: hybrid electric vehicle, powertrain configuration, topology design, fuel economy

CLC Number:

U469

HU Jianjun, LIU Zirui, MEI Bo, PENG Hang. Optimization Design Scheme of Power-split Hybrid Electric Powertrain Configuration with Single Planetary Gear[J]. Journal of Mechanical Engineering, 2021, 57(18): 264-276.

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