基于离散时间滑模控制器的自动变速器滑差控制

Slip Control of Automatic Transmission Based on Discrete time Sliding Mode Controller

摘要:

设计离散时间系统滑动模态变结构控制器,对闭锁离合器进行滑差控制以提高整车燃油经济性,消除发动机扭矩波动造成的传动系统冲击.采用零相位数字滤波器,以抑制滑模控制系统中的抖振.建立传动系统仿真模型对滑模控制器进行验证,并与传统比例积分微分(PID)控制器进行比较;通过硬件在环仿真测试车辆在十五循环工况(ECE)下有无滑差控制时的燃油消耗量.结果表明,滑差控制有效吸收传动系冲击,液力变矩器在滑差控制下的传递效率高于纯液力传动,可降低整车燃油消耗;基于滤波的滑模控制器,控制律平滑变化,具有更好的响应速度和跟踪指令信号的能力.

Abstract:

A discretetime sliding mode controller is designed to adjust the slip of torque converter lockup clutch so as to improve vehicle fuel economy and avoid the vibration of vehicle transmission system which is caused by engine torque fluctuation.Control variable is filtered by Filtfilt filter to smoothen vibration phenomenon of sliding mode control system.The simulation model of transmission system is built to verify this control method and to compare with the traditional proportionalintegralderivative (PID) control.For further testing the influence of slip control on vehicle fuel consumption in economic commission for Europe (ECE) cycle condition,actual transmission control unit (TCU) is involved in the hardwareintheloop experiments.The results of the simulation and experiment show that the slip control effectively absorbs transmission system shock and its transmission efficiency is far better than the torque converter working condition,so it can reduce the fuel consumption.In addition,the discretetime sliding controller with filter has a better response speed and trace command signal ability with control law changes smoothly.