并联式混合动力汽车机械式自动变速器换档策略

The Gearshift Strategy for Parallel Hybrid Electric Vehicle with Automatic Mechanical Transmission

并联式混合动力汽车(Parallel Hybrid Electric Vehicle,PHEV)档位决策作为能量管理策略的一部分,对整车动力性、经济性及排放性能有较大影响.混合动力汽车换档策略不仅要考虑发动机,还要考虑电机和电池系统的影响.基于电池电能的等效燃油概念,通过考虑电池充、放电过程中的能量损失,将充、放电生成或消耗的电能折算为等效燃油,由此得到不同档位时整车的综合燃油消耗,进而选取燃油消耗较小时的档位使整车经济性能指标达到最优.同时,该方法也通用于装备液力自动变速器(Automatic Transmission,AT)等有级式自动变速器的混合动力汽车换档策略制定.

As portion of the energy management strategy, the gear position decision strategy has effects on the dynamical, economical and even the emissions performance of the parallel hybrid electric vehicle （HEV）. The gear position decision for HEV should take into account not only the internal-combustion engine but also the motor and the power battery. By accounting the inefficiencies in energy conversion process, the battery energy consumed or produced by the motor is recorded as equivalent fuel consump- tion, then the synthetical fuel consumption in different gear position can be obtained and the optimal gear position can be selected to improve the fuel economy of HEV. The method proposed here can also be used in the HEVs which equipped with automatic transmission （AT）.