加速工况DCT离合器微滑控制减振性能理论与试验研究

Theoretical and experimental analysis on the damping performance ofmicro-slip control for a DCT clutch under acceleration working condition

为解决双离合变速器(dual clutch transmission,DCT)变速箱敲击问题,研究DCT离合器微滑控制的减振性能,通过建立考虑扭转减振器迟滞特性、离合器摩擦片动摩擦因素和微滑摩双闭环控制系统的整车传动系统非线性动力学模型。对比目标滑摩量与实际滑摩量差值验证了离合器微滑控制模型的有效性,分析了离合器摩擦片动摩擦因数和滑摩量对离合器微滑控制减振性能的影响规律,讨论了加速工况DCT离合器微滑控制的减振性能。分别对双质量飞轮有、无离合器微滑控制在相同的试验条件下进行整车道路扭振和敲击试验,通过试验分析了离合器微滑控制对传动系统扭振的衰减和敲击的改善作用,并与仿真结果进行对比。结果表明:仿真结果与试验结果基本一致,验证了本研究所建仿真模型的有效性;以及离合器微滑控制对敲击的衰减作用,对解决工程实际问题具有指导意义。

In order to solve the rattle problem of a dual clutch transmission(DCT) gearbox,the damping performance of the DCT clutch micro-slip control was studied.A nonlinear dynamic model of the transmission system was established considering the hysteresis characteristics of the torsional damper,the dynamic friction factors of the clutch friction plate and the micro-slip double closed-loop control of the system.The effectiveness of the clutch micro-slip control model was verified by comparing the difference between the target and the actual slip friction amount.Based on analyzing the influences of the clutch friction plate dynamic friction and slip friction amount on the clutch micro-slip control damping performance,the damping performance of the DCT clutch micro-slip control under acceleration working condition was discussed.The vehicle road environment torsional vibration and gear rattle tests of the dual-mass flywheel with and without the clutch micro-slip control were carried out under the same experimental conditions.The effects of the clutch micro-slip control on transmission system torsional vibration attenuation and gear rattle improvement were analyzed through tests,and the results were compared with the simulation results,which shows both are basically consistent.It verifies the effectiveness of the simulation model and the attenuation effect of the clutch micro-slip control on gear rattle.It is of guiding significance for solving practical engineering problems.