基于GA-LQR两挡DCT离合器目标转矩控制  

Target Torque Control of Two-speed DCT Clutch based on GA-LQR

作　　者：张志刚[1] 陈金晶 姚炼红 郑艳杰 Zhang Zhigang;Chen Jinjing;Yao Lianhong;Zheng Yanjie(Key Laboratory of Advanced Manufacturing Technology for Automobile Parts of Ministry of Education,Chongqing 400054,China;Chongqing Tsingshan Industrial Technology Center,Chongqing 402761,China)

机构地区：[1]汽车零部件先进制造技术教育部重点实验室,重庆400054 [2]重庆青山工业技术中心,重庆402761

出　　处：《机械传动》2020年第3期28-33,共6页Journal of Mechanical Transmission

基　　金：国家自然科学基金（51205432）;重庆市技术创新与应用示范项目（cstc2018jszx-cyztzx0131）;重庆市重点产业共性关键技术创新专项项目（cstc2017zdcy-zdzxX0008)

摘　　要：为获得更舒适的换挡品质,针对搭载有两挡双离合变速器(DCT)的电动汽车,对其换挡过程中两组离合器目标转矩进行协调控制。以冲击度与比滑摩功作为评价指标,并以冲击度与滑摩功为二次型目标泛函,采用线性二次型最优控制(LQR)方法确定换挡过程转矩相的离合器目标转矩。采用遗传算法(GA)的全局搜索能力对LQR中的加权矩阵进行最优选取,得到换挡品质更优的离合器目标转矩。最后,对当前采用定斜率计算确定的离合器目标转矩与采用所提方法确定的离合器目标转矩进行对比,结果表明,后者在换挡过程中所用的时间较少,产生的冲击度和比滑摩功都有所减小,有效提升了两挡DCT的换挡品质。For an electric vehicles equipped with two-speed dual clutch transmission(DCT),the two sets of clutch target torques are coordinated during the shifting process in order to obtain a more comfortable shifting quality.Regarded impact degree and the specific sliding friction work as evaluation indictor,and taking the im⁃pact degree and the sliding work as quadratic target functions,the Linear Quadratic Regulator(LQR)method is used to determine the clutch target torque of the torque phase of the shifting process.The global search ability of the genetic algorithm(GA)is used to optimally select the weighting matrix in the LQR.Thereby,the clutch tar⁃get torque of better shift quality is obtained.Finally,the target torque of fixed slope change clutch currently used in the two-speed DCT is compared with the clutch target torque determined by this method.The result shows that the latter takes less time during the shifting process,and both the impact degree and the sliding fric⁃tion work are reduced.The shifting quality of the two-speed DCT is improved effectively.

关 键 词：两挡DCT 离合器目标转矩 线性二次型最优控制 遗传算法 

分 类 号：U469.72[机械工程—车辆工程]