新型传动试验装置能量再生系统效率分析

建立了静液压储能传动汽车能量再生系统各分立元件及系统的分析模型，采用4阶Rugge-Kutta算法求解分析模型，获得了蓄能器内气体的压力和温度、泵／马达的扭矩和效率、液压回路的压力损失和飞轮的转速等参数，利用这些参数计算了能量再生系统系统的能量损耗和循环效率．计算结果表明，能量损耗主要产生于液压泵／马达，约占总损失的24％，当蓄能器的热时间常数为60s时，蓄能器基本处于绝热状态，热能损失很少；系统循环效率在50％～75％，与计算时飞轮的初速度和转动惯量有关。

Efficiency Analysis of the Energy Regeneration System for Vehicle of Hydrostatic Transmission

The models of the energy regeneration system consisting of an accumulator, a variable displacement pump/motor, connecting lines and flywheel have been set up. The parameters of the pressure and temperature of the accumulator, torque and efficiency of pump/motor, pressure loss and flywheel speed are obtained and used in order to solve the differential equations. The fourth order Runge-Kutta integration method is selected. The results show that 24% of energy loss is attributed to the hydraulic pump/motor. Having a thermal time constant of 60 s, the accumulator is found to operate essentially adiabatically with little thermal loss. Round trip efficiency is about 50%-75%, relating to initial speed and inertia of flywheel.