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International Journal of Automotive Technology > Volume 18(3); 2017 > Article
International Journal of Automotive Technology 2017;18(3): 473-487.
doi: https://doi.org/10.1007/s12239-017-0047-z
ENERGY MANAGEMENT AND DESIGN OPTIMIZATION FOR A SERIES-PARALLEL PHEV CITY BUS
Yuanchun Cai, Minggao Ouyang, Fuyuan Yang
Tsinghua University
ABSTRACT
Series-parallel PHEV city buses combine the advantages of series and parallel configurations and have been used in China. However, the design and energy management of series-parallel PHEV city buses based on Chinese driving conditions still need to be investigated. In this paper, an equivalent consumption minimization strategy is provided to optimize energy management for series-parallel PHEV city buses, and the process of the equivalent consumption minimization strategy for series-parallel is presented in this paper. Compared with the validated rule-based energy control strategy, ECMS shows a fuel economy improvement of 8.2 % in the CBCD (Chinese Bus Driving Cycle). Based on the optimal energy management, a design for a generator motor in the series-parallel configuration has been processed. The fuel consumption has been shown to decrease, with an increase in generator power, because the system with the higher generator power can work at a higher efficiency in the series mode and operate the engine in the high efficiency area in the parallel mode. Besides, in terms of cost-of-ownership for a PHEV bus for lifetime of 8 years, although the high generator power will lead to high purchase cost for series-parallel PHEV bus, a series-parallel PHEV city bus with a generator of 100 kW maximum power will still show small advantage in cost-of-ownership, based on current motor price and natural gas price.
Key Words: PHEV city bus, Series-parallel configuration, Energy management, Design, Optimization
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