席志强,周志立,张明柱,曹青梅.拖拉机动力换挡变速器换挡特性与控制策略研究[J].农业机械学报,2016,47(11):350-357.
Xi Zhiqiang,Zhou Zhili,Zhang Mingzhu,Cao Qingmei.Shift Characteristics and Control Strategy of Powershift Transmission on Tractor[J].Transactions of the Chinese Society for Agricultural Machinery,2016,47(11):350-357.
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拖拉机动力换挡变速器换挡特性与控制策略研究   [下载全文]
Shift Characteristics and Control Strategy of Powershift Transmission on Tractor   [Download Pdf][in English]
投稿时间:2016-07-01  
DOI:10.6041/j.issn.1000-1298.2016.11.047
中文关键词:  拖拉机  动力换挡变速器  换挡特性  控制策略
基金项目:国家自然科学基金项目(51375145)、河南省重点科技攻关计划项目(102102210165)和洛阳市重大科技专项(1001001A)
作者单位
席志强 西安理工大学
河南科技大学 
周志立 河南科技大学 
张明柱 河南科技大学 
曹青梅 西安理工大学 
中文摘要:拖拉机动力换挡变速器通过控制多组湿式摩擦离合器之间的转矩传递来实现不停车换挡,具有不会因超载使发动机熄火、起步性能好、能降低外载荷突然变化所引起的传动系统振动与冲击等优点。换挡离合器的分离与接合时序是影响拖拉机换挡平顺性和操作舒适性的关键因素。本文研究了换挡过程动态特性分析方法,引入变速器输出转速和输出转矩作为拖拉机生产率和动力性的评价指标,弥补了传统换挡品质指标不能对拖拉机性能进行评价的不足。运用动力学原理构建动力换挡变速器模型,研究了不同换挡重叠时间下的离合器载荷、滑摩功与功率特性,确定了动力换挡变速器换挡品质的控制方法及控制策略。提出以动力换挡变速器输出转速变化幅值为指标来优化换挡重叠时间与离合器接合油压,通过仿真验证了拖拉机换挡过程中离合器控制策略的有效性。仿真结果表明,通过该优化算法所选择的换挡参数受拖拉机牵引载荷变化影响较小,变速器输出转速过渡平稳,可减少负向输出转矩的产生,避免换挡过程中拖拉机减速或动力传递中断,提高了换挡品质。
Xi Zhiqiang  Zhou Zhili  Zhang Mingzhu  Cao Qingmei
Xi’an University of Technology;Henan University of Science and Technology,Henan University of Science and Technology,Henan University of Science and Technology and Xi’an University of Technology
Key Words:tractor  powershift transmission  shift characterictics  control strategy
Abstract:Through control of the torque transfer among several groups of wet friction clutch to realize gear shift in traveling, powershift transmission of tractor has a series of advantages, such as the engine will not flameout when overloaded, good starting performance, reducing the vibration and shock of transmission system caused by suddenly load changes. The separation and joint timing of the gear shift clutch is the key factor that affects the shifting smoothness and operating comfort of the tractor. The dynamic properties analysis method of the shift process was studied. It introduced transmission’s output speed and output torque as indexes to evaluate the productivity and power of tractor, which made up for the deficiency of traditional shift quality indexes cannot evaluate the performance of the tractor. Based on the dynamic principle, the transmission system model of the power shift tractor was constructed. The dynamic characteristics of the shift process were analyzed to research the load and power flow of clutch. The control method and control strategy of power shift transmission’s shift quality were determined. Taking the output speed variation amplitude as index to optimize shift overlap time and contact oil pressure of the clutch. The control strategy of clutch was verified by simulation. The simulation results showed that the gearshift parameters chosen with the optimization algorithm were less affected by the change of tractor traction load, and the transmission output speed was transitioned smoothly. It can reduce the negative output torque generated, which avoided tractor deceleration or power transfer interruption during gearshifting, and improved the shift quality.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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