城市客车并联液压混合动力系统参数匹配

Parameter Matching of Parallel Hydraulic Hybrid System for Urban Bus

为给城市客车并联液压混合动力系统进行更为合理的参数匹配,针对中国典型城市公交循环频繁启停特性,考虑客车行驶速度、牵引功率和制动能量分布区域等因素的影响,确定了液压泵马达参数和转矩耦合器传动比;采用不同初始制动压力和不同容积蓄能器组合进行制动压力和能量回收仿真,分析确定合适的蓄能器容积。研究结果表明:匹配后的液压混合动力系统参数在每次起步速度不超过20km.h-1时均能独立驱动客车前进,而且在每次制动过程中能够回收几乎所有可利用制动能量,整车燃油经济性得到显著提高。

In order to match parameters for the parallel hydraulic hybrid system （HHS） for the urban bus more reasonably, aimed at the frequent startup and stop characteristics of Chinese typical urban bus cycle, considering the influences of the driving velocity, the tractive power and the braking energy distribution of the bus, the parameters of the pump motor and the transmission ratio of the torque coupler were determined. Different initial braking pressures and volumes of the accumulator were grouped for the simulation of the braking pressure and the energy recovery. The comparison of the analysis results determined appropriate volume of the accumulator. The results show that the matched parameters of the parallel HHS can propel the bus exclusively from stand-still to 20km·h^-1, and can recover almost all braking energy available in each braking process, and therefore, the fuel economy of the urban bus can be improved greatly.