液压机械无级变速器的段内控制策略研究

发布时间：2018-01-09 00:05

本文关键词：液压机械无级变速器的段内控制策略研究　出处：《吉林大学》2011年硕士论文　论文类型：学位论文

更多相关文章： HMCVT 功率循环 效率 键合图 控制仿真

【摘要】：工程车辆具有工况复杂,作业对象多变等特点,经常在变载荷情况下工作。这不仅要求车辆具有较高可靠性和适应能力,同时也大大增加了操作难度。另外,随着能源危机、环境污染等问题日益严重,工程机械行业也面临着严峻的节能减排义务和责任。因此,实现无级变速对于提高工程车辆的动力性和经济性、减轻驾驶员劳动强度都有重要的意义。液压机械无级变速器(Hydro-Mechanical Continuously Variable Transmission,简称HMCVT)液压机械无级传动综合了液压传动的无级、柔性的特点和机械传动效率高的特点,在大功率拖拉机、工程车辆、坦克等许多领域有着良好的应用前景。本文对液压机械无级变速器的原理组成进行了分析,研究了液压机械无级变速器的速度特性、转矩特性、效率特性,为效率的分析和仿真模型的建立打下理论基础。文章采用解析法和键合图动态分析法对HMCVT的输入、输出功率和液压系统传递的功率的大小和方向进行了分析,证明HMCVT在每一段中都存在功率循环,并分别用两种方法对液压系统的效率和HMCVT的效率进行了分析,相互验证。对等比式液压机械无级变速器与ZL50装载机的匹配性进行了验证,分析了车辆的动力性。建立了发动机的稳态和动态数学模型。并根据以上分析,制定出以发动机最佳动力性和液压机械无级变速器工作在高效区为控制目标的段内控制策略。应用MATIAB/M-File、MATIAB/Simulink和RecurDyn动力学仿真模型建立ZL50装载机的整车仿真模型,其中包括发动机模型、HMCVT模型、控制器、车辆和负载模块等。使用仿真模型进行控制仿真,证实了该控制方法可以使发动机稳定在目标工作点,且使HMCVT工作在高效区,达到了控制目的。
[Abstract]:The engineering vehicle has the characteristics of complex working condition , changeable operation object and the like , and is often operated under the condition of variable load , which not only requires the vehicle to have higher reliability and adaptability , but also greatly increases the operation difficulty . Hydro - mechanical stepless transmission ( HMCVT ) hydraulic mechanical stepless transmission integrates the stepless , flexible characteristics of hydraulic transmission and the high efficiency of mechanical transmission , and has good application prospect in many fields , such as high - power tractor , engineering vehicle , tank and so on . In this paper , the principle components of hydraulic machinery stepless speed changer are analyzed , the speed characteristic , torque characteristic and efficiency characteristic of hydraulic machinery stepless speed changer are analyzed , and the theoretical foundation is laid for the analysis of efficiency and the establishment of simulation model . The analysis of the input , output power and power transmitted by hydraulic system is carried out by means of analytical method and bond graph dynamic analysis method . The efficiency of the hydraulic system and the efficiency of the HMCVT are analyzed by two methods , and the efficiency of the hydraulic system and the efficiency of the HMCVT are analyzed . The matching between equal - ratio hydraulic mechanical stepless speed changer and ZL50 loader is verified , and the dynamic characteristics of the vehicle are analyzed . The steady state and dynamic mathematical models of the engine are established . According to the above analysis , the control strategy for controlling the optimal power of the engine and the continuously variable transmission of the hydraulic machinery in the high - efficiency zone as the control target is worked out . The simulation model of ZL50 loader is established by using the simulation model of the dynamic simulation model , which includes the engine model , the HMCVT model , the controller , the vehicle , the load module , etc . The simulation model is used to control the simulation , and the control method can be used to stabilize the engine at the target working point , and the HMCVT can be operated in the high - efficiency area , and the control purpose is achieved .

【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH132.46

【引证文献】