This study provides an optimal selection methodology for plug-in hybrid electric vehicle (PHEV) powertrain configuration by means of optimization and comprehensive evaluation of powertrain design schemes. The challenge of this study is to reveal each powertrain configuration performance potential in different situations of object trade-off and solve the control-physical integrated optimization problem of the PHEV powertrain design. To determine performance potential, a configuration-sizing-control strategy integrated multi-objective powertrain optimization design is proposed and applied to series, parallel pre-transmission (P2), output power-split, and multi-mode power-split powertrain configurations. Firstly, considering simultaneous optimization of fuel economy, electric energy consumption, and acceleration capacity, the parameters of the powertrain components and vehicle performance of each configuration are optimized based on global optimal control in different situations of object trade-off. Then, the Pareto optimal selection of powertrain configuration and its corresponding optimal component parameters are obtained by performance comparison and non-domination sorting. The results suggest that the P2 configuration and its optimal sizing can be selected when the goal is to optimize acceleration capacity, the multi-mode power-split configuration and its optimal sizing can be selected when the goal is to optimize electric energy efficiency, and the output power-split configuration and its optimal sizing can be selected when the fuel economy needs to be optimized.

本研究通过优化和综合评估动力总成设计方案，为插电式混合动力汽车（PHEV）动力总成配置提供了一种最佳选择方法。这项研究的挑战是揭示在目标权衡的不同情况下每种动力总成配置的性能潜力，并解决PHEV动力总成设计中的控制物理综合优化问题。为了确定性能潜力，提出了一种配置大小控制策略集成多目标动力总成优化设计，并将其应用于串联，并行预传输（P2），输出功率分配和多模式功率分配动力总成配置。首先，考虑同时优化燃油经济性，电能消耗和加速能力，动力总成部件的参数和每种配置的车辆性能基于对象最优折衷情况下的全局最优控制进行了优化。然后，通过性能比较和非支配排序，获得动力总成配置的帕累托最优选择及其对应的最优组件参数。结果表明，当目标是优化加速能力时，可以选择P2配置及其最佳尺寸；当目标是优化电能效率时，可以选择多模功率分配配置及其最佳尺寸，并且当需要优化燃油经济性时，可以选择输出功率分配配置及其最佳尺寸。