串并联混合动力变速箱挡位对整车性能的影响

针对串并联混合动力车辆变速箱选型匹配问题,采用试验设计（DOE）方法选取变速箱最优速比并分析挡位对整车性能的影响。建立了整车仿真模型和控制策略并进行了台架验证,分析了该混合动力系统3种变速箱挡位配置对车辆的加速性能、爬坡性能和整车油耗的影响。仿真结果表明,挡位的增多可以提高整车动力性,降低整车对电池放电功率及电池容量的需求,但是对整车油耗改善较小。进一步仿真结果表明,即使改善发动机低转速中高负荷区域的燃油消耗率,变速箱挡位数对整车油耗的影响也不大。

Effects of Transmission Gears on Series-parallel Hybrid Vehicle Performance

The optimal speed ratio of a series-parallel hybrid transmission was selected using the design of experiment （DOE） method and the effect of transmission gears on vehicle performance was investigated for the transmission matching of series-parallel hybrid vehicles. The vehicle simulation model and control strategy were developed and verified by bench tests, and the vehicle acceleration performance, climbing performance and fuel consumption with three types of transmission were analyzed. The results show that more transmission gears can improve the dynamics performance of the vehicle and reduce the demand for battery discharge power and electricity. However, the improvement in the vehicle fuel consumption is insignificant. Further simulations indicate that the number of transmission speed does not have a significant impact on the vehicle fuel consumption even when the fuel consumption of engines is improved at the low-speed, mid-to-high load ranges.