中文摘要：

液力自动变速器可起到缓冲冲击的作用,在工程车辆应用普遍。将反步法控制应用于变速器换挡过程,将换挡品质优化问题转化为单一目标轨迹跟踪问题。分析换挡过程中各阶段分离离合器与结合离合器运动状态,建立离合器输出扭矩数学模型。利用变速器转速变化,观测结合离合器转速情况,设定目标轨迹。结合输入状态稳定理论设计滑摩控制器,改变离合器控制电磁阀结合电流实现结合离合器转速对目标转速轨迹跟踪。结果表明,滑摩控制器输出结果对目标轨迹跟踪紧密,换挡过程中车辆冲击度幅值小于10m/s3,满足行业标准,有效提高工程车辆换挡品质,提供舒适性,为此类研究提供参考依据。

英文摘要：

Automatic transmission can cushion the impact of the role of the transmission system,widely used in engineering vehicles. Applying the backstepping control to gear shifting process,the optimizing shift quality problem becomes a single target trajectory tracking problem instead of a multi-objective optimization problem. By analyzing the motion states of off-going clutch and upcoming clutch,the mathematical model of output torque for clutches have built. Based on the rotate input speed and output speed of transmission,the ideal objective trajectory has defined. Utilizing the input state stability theory to design the slider controller,the objective trajectory is tracked by tuning the control current of valves. The result of joint simulation indicates that the controller tracks the objective rotate speed closely and the jerk of vehicle fulfills the standard. It means the shifting quality has been improved for off- road vehicle.