摘要
为获得大功率拖拉机无级调速与动力换挡试验所需的湿式离合器控制规律,设计并试制1台拖拉机湿式离合器换挡液压试验台。首先,阐述湿式离合器的结构与控制原理;其次,设计其液压系统,包括泵站的计算、选型和工作油路的阀块设计;再次,基于Labview和PLC开发试验台的远程控制系统,并基于NI数据采集卡实现传感器数据的实时读取;最后,构建了该试验台的决策支持模型,并重点对比例减压阀和湿式离合器模型进行试验验证。结果表明:所选用比例减压阀的线性度和最小起调压力满足试验需求,其压力调整曲线与压差—流量曲线的最大仿真误差均小于额定输出压力的4%;湿式离合器的压力控制仅在其活塞到达止点后有效,其接合压力在3个关键点处的最大时间仿真误差小于离合器总接合时间的2%。本研究所开发的试验台在132 kW动力换向拖拉机的研发项目中首次取得应用,极大提高研发效率,不仅表明其设计的合理性,同时也为后续无级变速拖拉机的研究提供试验平台。
In order to obtain the wet clutch control law for big-power tractor with continuously variable transmission or power shift transmission,a hydraulic test bench for wet clutch shifting tractor was designed.Firstly,the structure and the control principle of the wet clutch was introduced.Secondly,the hydraulic system was designed,including the calculation and selection of the pump station and the valve block design of the working oil circuit.Thirdly,the remote control system of the test bench was developed based on Labview and PLC,and the real-time reading of the sensor data of the test bench was realized based on the NI data acquisition card.Finally,the decision support model of the test bench was constructed.The models of proportional pressure reducing valve and wet clutch were emphatically tested and verified.The results showed that the linearity of the pressure adjustment curve and the minimum control pressure of the proportional pressure reducing valve meet the experimental requirements,the maximum simulation error of the pressure adjustment curve and the pressure-flow curve were less than 4%of the rated output pressure.The pressure control of the wet clutch is only effective after the piston reaches the end stop,the maximum time simulation error of 3 key clutch pressure points was less than 2%of the total clutch engagement time.The test bench developed in this study was applied for the first time in the research of 132 kW power reversing shift tractor,which greatly improved the research and development efficiency.It not only shows the rationality of its design,but also provides a test platform for the follow-up research on the continuously variable tractor.
作者
宋悦
刘风平
王光明
韩密密
黄冬梅
宋光密
Song Yue;Liu Fengping;Wang Guangming;Han Mimi;Huang Dongmei;Song Guangmi(College of Mechanical and Electronic Engineering,Shandong Agricultural University,Tai’an,271018,China;Shandong Provincial Key Laboratory of Horticultural Machineries and Equipment,Tai’an,271018,China;Shandong Weifang Luzhong Tractor Co.,Ltd.,Weifang,261000,China)
出处
《中国农机化学报》
北大核心
2019年第7期78-84,共7页
Journal of Chinese Agricultural Mechanization
基金
国家重点研发计划项目(2016YFD0701103)
山东省重点研发计划项目(2018GNC112008)
山东省农机装备研发创新计划项目(2017YF026)
山东省“双一流”奖补资金资助项目(SYL2017XTTD14)
关键词
拖拉机
湿式离合器
试验台
动力换挡
无级调速
tractor
wet clutch
test bench
power shift
continuously variable transmission
作者简介
第一作者:宋悦,女,1996年生,山东青岛人,硕士研究生,研究方向为无级变速拖拉机。E-mail:songyuesdau@163.com;通讯作者:王光明,男,1986年生,山东枣庄人,博士,副教授,硕导,研究方向为无级变速拖拉机。E-mail:gavinwang1986@163.com
