Abstract:

A serial hydraulic hybrid power transmission system was  researched
as the object,the view of the fuel economy improvement rate was put forward.According to analysis operation rule and dynamic programming optimization of power source,the influences
 of  hydraulic hybrid vehicle with different volumes of accumulators on fuel economy improvement
rate were analysized,and the fuel economy was simulated by the city and highway driving cycle on the different volumes of  accumulators.The simulation results show that the matching the smaller volume of
accumulator for the hydraulic hybrid vehicle has better fuel economy improvement rate and
energy saving effect under the premise to meet power flow and recovery of braking
energy,and the rate of fuel economy improvement is at 25%~39%.

Key words: hydraulic hybrid vehicle, accumulator, matching, optimization, fuel economy

摘要：

以串联式液驱混合动力传动系统为对象,
从燃油经济性改善率观点出发，根据动力源运行规则假设及优化，分析蓄能器容积大小对液驱混合动力车辆燃油经济性改善率的影响，并通过城市和公路循环工况对使用不同容积蓄能器的燃油经济性进行仿真计算。仿真结果表明：在满足功率流和回收制动能量的前提下，匹配较小容积蓄能器的液驱混合动力车辆具有较好的燃油经济性改善率和节能效果，其燃油经济性改善率达25%~39%。

关键词: 液驱混合动力, 蓄能器, 匹配, 优化, 燃油经济性