本文介绍了基能软启动的原理与运行特点，以及MCC控制柜的作用与功能。

A series-parallel hydraulic hybrid system applied to public buses is put forward,and parameters of key components are analyzed and determined.Energy management strategy based on logic threshold is designed which is aimed at efficient operation of the overall system considering the operational characteristic of the components and taking the curves of engine,hydraulic pump/motor and hydraulic pump as the main design basis;regenerative control strategy which makes regenerative brake system and frictional brake system work harmoniously is designed to raise recovery rate of regenerative brake energy.System dynamic modeling and simulation results show that the energy control strategy designed here is able to adapt system to changes of working condition and switch the operating mode reasonably.The regenerative braking control strategy is effective in raising the utilization of energy and improving fuel economy.

液压缸作为液压传统系统中最为重要的元件,其工作效能对液压传动系统有着非常重要的影响。文章基于此,首先对液压缸的结构设计做了分析与研究,重点分析了液压缸的缸体、活塞杆、端盖与套筒的设计,继而借助仿真实验,从多个角度分析了液压缸结构的运行特点。