液力自动变速器离合器的闭环滑差控制  

Closed-loop Slip Control of Clutches in Hydraulic Automatic Transmission

作　　者：戴振坤[1] 徐向阳[1] 刘艳芳[1] 王书翰[1] 

机构地区：[1]北京航空航天大学交通科学与工程学院,北京100191

出　　处：《汽车工程》2012年第8期718-722,共5页Automotive Engineering

基　　金：国家科技支撑计划(2011BAG09B00)资助

摘　　要：对液力自动变速器换挡过程中充油阶段、转矩交换阶段和速度同步阶段的离合器滑差控制过程进行了详细分析。在3个控制阶段内,采用带前馈的PID控制算法,通过对离合器转矩容量和油压的闭环控制,获得了准确的离合器目标滑差。在速度同步阶段采取了EMS辅助转矩控制的方法,获得了平滑的速度同步过程,进而降低了车辆在换挡过程中的冲击。为便于离合器滑差的计算,本文中还提出了一种离合器的位置等效迁移方法,并给出了等效转换系数计算公式。实车测试结果表明,采用离合器滑差控制后,车辆在有动力升挡的过程中发动机转矩传递平顺、离合器速度同步过程平滑,减弱了换挡冲击,冲击度低于20m/s3。另外,离合器的油压传感器也可取消以降低成本。The clutch slip control in the shifting process of hydraulic automatic transmission covering oil filling phase, torque phase and synchronizing phase is analyzed in detail. During the 3 phases, through the closed loop control over the potential torque and oil pressure of clutch by using feed-forward PID control, the accurate desired clutch slip is obtained. In the synchronizing phase, the EMS-assisted torque control is adopted to achieve smoother speed synchronization and less shift shock. For easy calculation of clutch slip, a scheme of clutch position equivalent transfer is also proposed in this paper with the calculation formulae of conversion factor given. The results of vehicle test show that during the process of power-on up shift with clutch slip control, the engine torque transmission and clutch speed synchronization become smoother and the shift shock is reduced with a jerk value lower than 20m/s3. In addition the oil pressure sensors in clutches can also be eliminated for cost saving.

关 键 词：自动变速器 离合器控制 滑差控制 

分 类 号：U463.212[机械工程—车辆工程]