基于最优控制的AMT/DCT离合器通用起步控制

Universal Clutch Starting Control of AMT/DCT Automatic Transmission Based on Optimal Control

依据自动变速器离合器从动侧运动状态判别离合器的起步与换挡状态,建立电控机械式自动变速器(Automated manual transmission,AMT)和双离合器自动变速器(Dual clutch transmission,DCT)的离合器起步统一动力学模型,采用线性二次型最优控制方法,将冲击度转换为最优控制的约束条件之一,以滑摩功最小为目标,通过AMT离合器起步、DCT单离合器起步和DCT双离合器起步时的状态变量选择、参数设置和约束条件修改,实现了AMT和DCT统一的离合器最优起步控制。仿真与试验结果表明,上述方法能够实现AMT和DCT离合器起步控制的通用化,从而为AMT/DCT自动变速器通用开发平台的构建奠定了基础。

Starting and shifting states of clutch in automatic transmission are identified on the basis of the motion states of driven plates of the clutch.Unified dynamic model is set up for the starting control of clutches in both automatic mechanical transmission（AMT） and dual clutch transmission（DCT）.The linear quadratic optimal control method is used to achieve the optimum starting control of the clutches,in which the jerk is converted to one of the restrain conditions,and the minimization of sliding friction work of the clutches is set as optimal target in control.Universal optimal starting control of AMT and DCT clutches is realized through selection of state variables,setting of parameters and modifying of restrain conditions in the unified model for clutch starting of AMT,single and dual clutch starting of DCT.Simulation is carried out and then verified by experiment.The research results lay the foundation for the construction of universal development platform of the AMT and DCT automatic transmissions.