液压机械无级变速器控制系统研究

发布时间：2018-03-13 07:49

本文选题：水稻插秧机　切入点：HMT　出处：《吉林大学》2016年硕士论文　论文类型：学位论文

【摘要】：水稻插秧机的使用对水稻的产量大大增加,改善了原有的手工插秧质量,也同时对农业产量有所提升。我国的农业经济发展有了突飞猛进的进展。由于水稻插秧机长期处于不好的环境条件下,对机器的损耗非常的大,所以对插秧机的传动系统要求很高。这时,一款对插秧机的耐久性、工作稳定性以及燃油性损耗要求较高的变速器至关重要,HMT液压机械无级变速器可以实现无级传动,机器工作效率有明显的提升,对水稻插秧机来说是一种很理想的无级变速器。本文对水稻插秧机无级变速器控制系统进行研究,基于控制策略的基础上,对控制系统方案进行了设计。分别研究了变量泵控制原理、离合器/制动器液压控制原理、液压机械无极传动控制方案设计,控制器是整个系统的核心,其共有四个输入信号,分别是节气门位置、模式选择信号、制动踏板位置和车速信号,分别通过对应的传感器或者上位机输出信号获得;进行了HMT控制系统硬件总体设计,电磁换向阀电磁比例阀驱动电路设计,通信接口电路设计;进行了HMT控制系统软件设计,HMT控制系统软件设计使用模块化的方法,整个控制程序分为多个处理模块:初始化模块、自检模块、CAN总线通信模块、串口通信模块、显示模块、监控与异常处理模块、驾驶员模块以及主程序,并设计了实现控制策略的软件程序。控制策略的完善使得HMT的效率有了明显的提升,利用AMESim软件对水稻插秧机发动机进行建模,数据分析,建立水稻插秧机仿真模型,应用AMESim与Simulink对插秧机的控制系统进行建模与仿真,得到水稻插秧机关键参数的实际数值与控制数值的跟随效果较好,从而验证了控制系统在智能控制策略下能够稳定地工作,提高了水稻插秧机液压无级变速器的实用性与可靠性。
[Abstract]:The use of rice transplanter has greatly increased the yield of rice and improved the quality of the original hand-planted rice seedlings. At the same time, the agricultural output has also been increased. China's agricultural economy has made rapid progress. Because rice transplanters have been in bad environmental conditions for a long time, the loss of the rice transplanters is very large. Therefore, the transmission system of the transplanter is very high. At this time, it is very important that a transmission with high requirements for the durability, working stability and fuel loss of the transplanter can realize stepless transmission with HMT hydraulic and mechanical stepless transmission. The working efficiency of the machine is obviously improved, which is an ideal stepless transmission for rice transplanter. In this paper, the control system of stepless transmission of rice transplanter is studied, based on the control strategy. The control system scheme is designed. The variable pump control principle, clutch / brake hydraulic control principle and hydraulic machinery electrodeless drive control scheme are studied respectively. The controller is the core of the whole system, and there are four input signals. The throttle position, mode selection signal, brake pedal position and speed signal are obtained by corresponding sensor or PC output signal respectively. The overall hardware design of HMT control system is carried out. The design of electromagnetic proportional valve driving circuit and communication interface circuit, the software design of HMT control system and the software design of HMT control system using modularization method, the whole control program is divided into several processing modules: initialization module, Self-testing module can bus communication module, serial communication module, display module, monitoring and exception handling module, driver module and main program, The software program to realize the control strategy is designed. The improvement of the control strategy improves the efficiency of HMT obviously. The model of rice transplanter engine is modeled by AMESim software, and the simulation model of rice transplanter is established by data analysis. Using AMESim and Simulink to model and simulate the control system of rice transplanter, the actual value and control value of key parameters of rice transplanter are obtained, and the result shows that the control system can work stably under the intelligent control strategy. The practicability and reliability of hydraulic stepless transmission of rice transplanter are improved.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：S223.91;TP273

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