无离合器机械式自动变速器换挡过程的扭矩控制  

TORQUE CONTROL OF CLUTCHLESS AMT DURING GEAR SHIFTING

作　　者：祁炳楠 杨刘权 郭晓斌 张利鹏[3] Qi Bingnan;Yang Liuquan;Guo Xiaobin;Zhang Lipeng(Engineering Training Center,Yanshan University,Qinhuangdao 066004,China;Hebei Key Laboratory of Special Delivery Equipment,Yanshan University,Qinhuangdao 066004,China;School of Vehicle and Energy,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]燕山大学工程训练中心,秦皇岛066004 [2]燕山大学河北省特种运载装备重点实验室,秦皇岛066004 [3]燕山大学车辆与能源学院,秦皇岛066004

出　　处：《动力学与控制学报》2021年第3期53-59,共7页Journal of Dynamics and Control

基　　金：河北省自然科学基金资助项目(E2016203173,E2020203078)。

摘　　要：电动汽车所采用的无离合器机械式自动变速器的降扭和扭矩恢复会引起传动系统的扭振,降扭调节不当还会对后续的换挡控制产生不利影响.为提高换挡品质,对换挡过程的降扭和扭矩恢复两个阶段的动力学机理和控制方法进行了研究.建立了传动系统扭振模型和同步器齿轮啮合模型,分析了换挡过程扭矩变化对扭振的激励规律,揭示了非充分降扭对摘挡过程车辆动力学性能以及执行机构损伤的影响机理;根据二阶系统特性设计了扭矩控制器,根据系统初始状态假设设计了虚拟系统,实现了对扭矩控制过程的系统扭振抑制和初始状态估计;完成了降扭和扭矩恢复控制效果仿真验证.研究表明,所设计控制器可以通过调节控制率系数来配置系统阻尼比,从而得到不同的扭矩控制特性,在阻尼比系数接近于1时能够有效降低降扭阶段和扭矩恢复阶段产生的扭转振动.The torque reduction and torque recovery of the clutch-less AMT used in electric vehicles will cause torsional vibration of the transmission system.Improper torque reduction adjustment will also adversely affect subsequent shift control.In order to improve the shift quality,the dynamic mechanism and control method of the two stages of torque reduction and torque recovery in the shifting process are studied.A torsional vibration model of the transmission system and a synchronizer meshing gear model are established,with the excitation law of torsional vibration during the shifting process being analyzed,and the influence mechanism of the inadequate torque reduction effect on vehicle dynamics and damage to the actuator during the gear shifting process being revealed,A torque controller according to the characteristics of the second-order system and a virtual system based on the initial state assumptions of the system are designed,with and the system torsional vibration suppression and initial state estimation of the torque control process being realized.Finally,the torque reduction and torque recovery control effects simulation are completed.The research shows that the designed controller can configure the damping ratio of the system by adjusting the control rate coefficient to obtain different torque control characteristics.When the damping ratio coefficient is close to 1,it can effectively reduce the torsional vibration during the torque reduction phase and the torque recovery phase.

关 键 词：电动汽车 机械式自动变速器 换挡品质 扭矩控制 扭振抑制 

分 类 号：U463.2[机械工程—车辆工程]