双离合自动变速器预选挡特性分析及控制策略  

Gear preselector characteristics and control strategy of dual clutch transmission

作　　者：刘玺[1] 何仁[1] 程秀生[2] 

机构地区：[1]江苏大学汽车与交通工程学院,镇江212013 [2]吉林大学汽车工程学院,长春130025

出　　处：《农业工程学报》2018年第3期80-87,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：江苏省高校自然科学研究重大项目(13KJA580001);江苏大学高级人才科研启动基金(14JDG155);江苏省自然科学基金(BK20150515)

摘　　要：针对双离合自动变速器奇偶挡位分属不同离合器的结构特点,在对其预选挡原理分析的基础上,提出了能够发挥结构优势的预选挡策略,在特定工况通过对目标挡位离合器的压力控制,实现待结合齿圈所在齿轴的调速,从而尽可能减小同步器主从动部分转速差,提高预选挡品质;随后从运动学与动力学角度,分别对挂挡、摘挡特性进行分析,揭示了同步力与同步时长的关系,建立了预选挡过程阻力模型;选取冲击度和滑磨功为预选挡品质评价指标,结合换挡阻力,得到各阶段换挡力;基于拨叉位置-换挡力特性,制定预选挡过程换挡拨叉目标位置,提出了拨叉位置闭环预选挡模糊控制策略;最后分别在搭载6速双离合自动变速器的某试验车和试验台架上进行摘挂挡测试和耐久试验,试验结果表明预选挡阻力模型接近实际阻力特性,换挡拨叉实际位置对目标位置的跟踪误差不超过4.67%,预选挡过程迅速平稳,冲击度和滑磨功率符合预期目标。该研究为双离合自动变速器预选挡特性及控制研究提供了参考。Gear preselector is a key component for gear shifting of dual clutch transmission（DCT） and a premise for clutch interaction. To realize quick and comfortable shifting, the control of gear preselector must be immediate and steady. As the odd and even gear of DCT belong to different clutches, this paper firstly analyzed the principle and power transmission line of gear preselector and then formulated gear preselection strategy that could take full use of its structural advantage. Through pressure control of target gear under special operating condition, the speed regulation of gear shaft in to-be-connected gear ring was realized, and thus the speed difference between master and slave part of synchronizer was reduced as much as possible, and smaller degree of sliding friction and shorter synchronization time during synchronizing process could be achieved. Subsequently, from the perspective of kinematics and dynamics and based on the mechanical structure of gear preselector, the neutral gear self-lock resistance, frictional force, synchronizing force of joint sleeve, resistance force of joint ring gear, and shifting fork self-lock force were investigated. Through calculating the resistance forces related with fork position during different stages, the relation between synchronizing force and synchronization time could be revealed, and the resistance model of preselection process could be established. After that, by selecting degree of shock and slipping friction work as 2 evaluation indices for gear preselector, the relationships between degree of shock and shifting force during synchronizing process and during joint sleeve-joint gear ring engagement process were analyzed, as well as the relationship between slipping friction work and shifting force during synchronizing process. On the basis of guaranteeing the smoothness of preselection process and under the premise that the synchronizing ring would not be worn, allowable values of degree of shock and extreme sliding power were set. Based on these 2 extreme valu

关 键 词：车辆 控制 变速器 预选挡 同步器 位置闭环 

分 类 号：U463.2[机械工程—车辆工程]