Second , pid arithmetic that is proved to be mature and have excellent performance by practical application is adopted to deal with various problems which hydraulic proportional system could meet with . in practical control , data acquisition & control card made by advantech co . , ltd acts as key element to deal data . this hydraulic - mechanic system integrates the computer technique , hydraulic proportional control and data acquisition technique 在控制算法方面，采用在工业实际应用中已经成熟的、在实际应用中经过验证具有优越性能的pid算法为基本控制算法来处理该液压比例系统所遇到的各种问题(如阀开口为负遮盖引起的死区问题和系统控制的稳定性问题) ；对于实际的控制，采用集数据采集与控制于一体的研华数据采集控制卡作为核心元件，从而在理论上研究并在实际应用中能体现出该液压比例控制系统的基本性能。
The basic principle of hydraulic system of tb80k trimming is set forth . the changing process of engaging pressure is analyzed and studied , the engaging pressure is produced in transmission controlled by electro - hydraulic proportion when shift gear is switched ; the hydraulic control system used in remote control is studied and designed applied with electro - hydraulic proportional control theory and on the basic of the hydraulic characteristic of tb80k trimming dozer , more and more electro - hydraulic reform projects and assumption are present 本文阐述了tb80k推耙机液压系统的基本原理；对电液比例控制变速箱换档在各档之间切换的接合压力变化过程进行试验分析研究；应用电液比例控制理论，结合tb80k推耙机液压系统结构特点进行遥控液压控制系统研究和设计，并提出了多种电液改造方案和设想。
Based on above two points , developing electro - hydraulic proportional controller of having independent intellectual property is now urgent to civil auto crane manufacturer . at the beginning , in this thesis , a serial of models about auto crane ’ s function , construction and action are provided after being carefully analyzed with the modeling tool uml ( united modeling language ) . using these models , we can easily get along with the design and realization of electro - hydraulic proportional controller 本文首先从研究汽车起重机的功能入手,以面向对象的观点和使用uml作为建模工具,透彻地分析了汽车起重机功能应该具有的结构、行为特性,经过分析得出的结构、行为方面的特性是作为汽车起重机功能的内部描述存在的、具有固定不变的特点,这些特性的描述是研究与设计汽车起重机电液比例控制系统所必需的基础工作。
Chapter 2 describes the working theory of the hydraulic elevator control system , and introduces the components of this system , especially the vsvii integrated valve , which could be regulated by the controller of single chip processor with flexible control strategy . also the mathematical models for the hydraulic elevator control system with vsv ii valve are derived and the simulation is made 论文的第二章主要介绍采用轿厢速度反馈电液比例控制的液压电梯的工作原理，分析了本课题所采用的控制系统的各个组成部分，特别介绍了本课题组自行研制的vsv型液压电梯专用比例阀和计算机监测系统，并对液压电梯速度控制系统进行了建模和仿真。
This system captures the rack position signal and rotate speed signal of the fuel injection pump , and calculates the circulating fuel injection quantity by programming the computer . then the computer is programmed to control the daq board to generate a certain width pulse . finally , controlled by the pulse , the alcohol injection system injects a certain quantity alcohol into inlet manifold according to a setting diesel / alcohol proportion 该系统采用了在labview平台上开发的pc总线?插卡式虚拟仪器系统，系统通过采集喷油泵的供油拉杆位置信号和转速信号，利用计算机计算得出柴油的循环喷油量，再根据程序设定的柴油/酒精比例控制数据采集卡发出一定宽度的脉冲，控制低压酒精喷射系统按比例将酒精喷入进气歧管。
In this paper , through analyzing and discussing current development of typical hydrostatic drive system of crawlers at home and abroad , it studies property - matching of hydrostatic transmission systems , provides an electronic proportional controlling variable displacement pump - motor hydraulic drive circuit and control plan fit for crawlers " operation , together with typical travel drive system component 本文对国内外推土机行驶静压驱动系统研究现状进行了分析和综合，对静压行驶驱动系统的性能匹配进行了分析，结合典型行驶驱动系统的组成、工作原理提出了适合推土机工作的电比例控制变量泵-变量马达液压驱动回路及其控制方案。
The following specific goals are expected to reach under the sustained energy development strategy : energy consumption of per unit gnp will be reduced by 20 % on the level of the end of the 10th five - year plan ; primary energy demand will be less than 2 . 5 billion tons of standard coal by 2020 , saving 0 . 8 billion tons ; coal consumption ratio is controlled under 60 % , renewable energy utilization reaches 525 million standard coal ( power generation by renewable energy stands at 100 million kilowatt ) ; oil importing reliance is controlled under around 60 % ; the reduction rate of main pollutants is 45 % - - 60 % 通过实行可持续发展的能源战略，有望达到如下理想目标：单位国内生产总值能源消耗比“十五”期末降低20左右；到2020年一次能源需求少于25亿吨标准煤，节能达到8亿吨标准煤；煤炭消费比例控制在60左右，可再生能源利用达到5 . 25亿标准煤(其中可再生能源发电达到1亿千瓦) ；石油进口依存度控制在60左右；主要污染物的削减率为45 ? 60 。
Third , the center of mass stabilization loop is designed by the proportion control law in variable structure control , the design method of the proportion control law is deducted elaborately . the result is the character points is unified on parameter . the two simulation results of the different methods are compared in this paper 第三，利用变结构控制中的比例控制规律对导弹的质心稳定回路进行了设计，详细推导了比例控制规律的设计方法，实现了各个特征点设计参数上统一，并对前面两种设计方法的仿真结果进行了比较，最后还讨论了两种设计方法对干扰的抑制作用。
