Analyzing the impact of energy-saving factors on fuel consumption for hybrid electric vehicles (HEVs) is essential to revealing their inherent energy-saving mechanisms, and it is a significant reference for exploring the energy-saving potential and the direction of optimization calibration. This paper focuses on a unified quantitative exploration of the factors affecting the fuel economy. First, the coupling characteristics in energy conversion and losses are investigated based on energy flows, and a concept of average comprehensive transmission efficiency (ACTE) is defined. Second, a novel theoretical fuel consumption model is developed and the fuel-saving contribution rate (FSCR) is proposed, achieving the purpose of decoupling analysis of the fundamental fuel consumption impact factor. Finally, to verify the analysis method proposed in this paper, the results are compared between simulation and theoretical calculations on three typical hybrid electric buses, including parallel, series/parallel, and power-split HEVs. The comparison results demonstrate that the developed theoretical model has remarkable consistency with the simulation model. Furthermore, specific analyses of different impact factors are conducted, quantitatively deepening the understanding of factors affecting fuel economy and quickly facilitating the future economic performance prediction of new-generation HEVs.

分析节能因素对混合动力汽车（HEV）的燃料消耗的影响对于揭示其固有的节能机制至关重要，并且对于探索节能潜力和优化标定的方向也具有重要的参考意义。本文着重于对影响燃油经济性的因素进行统一的定量探索。首先，基于能量流研究能量转换和损耗的耦合特性，并定义了平均综合传输效率（ACTE）的概念。其次，建立了一种新型的理论油耗模型，提出了节油贡献率（FSCR），从而达到了对基本油耗影响因素进行解耦分析的目的。最后，为了验证本文提出的分析方法，将仿真和理论计算的结果在三种典型的混合动力公交车上进行了比较，包括并联，串联/并联和功率分配混合动力电动汽车。比较结果表明，所建立的理论模型与仿真模型具有显着的一致性。此外，对不同的影响因素进行了专门的分析，从数量上加深了对影响燃油经济性的因素的理解，并迅速促进了新一代混合动力汽车的未来经济表现预测。比较结果表明，所建立的理论模型与仿真模型具有显着的一致性。此外，对不同的影响因素进行了专门的分析，从数量上加深了对影响燃油经济性的因素的理解，并迅速促进了新一代混合动力汽车的未来经济表现预测。比较结果表明，所建立的理论模型与仿真模型具有显着的一致性。此外，对不同的影响因素进行了专门的分析，从数量上加深了对影响燃油经济性的因素的理解，并迅速促进了新一代混合动力汽车的未来经济表现预测。