液压变压器在理论上能够无节流损失地控制直线执行机构的运动速度，而且能够回收负负载的能量，为了提高液压变压器的能量利用效率，文中设计了节能系统的总效率模型，以总效率最高为目标，采用优化算法计算出液压蓄能器容积的数值，分析了气体压力在回收能量过程中的变化曲线，完成了对液压蓄能器的参数匹配；建立了节能系统的Simulink模型，采用模糊PID控制策略对负载下降时的运动速度进行控制。仿真结果表明，该控制策略能够很好地实现对负载运动速度的控制。

The hydraulic transformer can theoretically control the speed of the linear actuator without throttling loss and can recover and reuse the energy of the load. In order to improve the energy efficiency of the hydraulic transformer，, thea total efficiency model of the energy-saving system iwas designed in this paper. Based on To achieve the highest total efficiency，, the numerical value of the hydraulic accumulator volume iwas calculated by optimization algorithm，and t. The variation curve of gas pressure in the process of energy recovery iwas analyzed，, and the parameter of the hydraulic accumulator was the parameter matching of the hydraulic accumulator is completed. The Simulinkmathematical model of Simulink for of energy-saving system iwas established. The speed of movement was controlled Twith the fuzzy PID control strategy is used to control the motion speed when the load is falling. The simulation results show that the control strategy performs well in speed controlcan well control the motion speed.