基于转矩的低附路面机械式自动变速器控制策略

从机械式自动变速器控制系统所能获取的有限数据,判断行驶路面的附着系数以及车辆轮胎打滑情况,并进行驱动防滑控制;通过发动机转矩、变速器数据、整车状态等对车辆正常的加速度范围进行计算,并和轮速加速度进行比较,以确定车轮打滑情况。根据轮加速度的大小进一步判断路面附着系数。轮胎打滑时,通过对发动机的降扭和离合器的控制,实现驱动防滑的控制;在试验车辆上进行低附路面识别和控制的试验,能够正确识别出路面附着系数。在低附路面起步时,通过打滑时发动机转矩和离合器的控制,避免了车轮连续的滑转,大大提高了车辆的稳定性。这说明该低附路面识别和控制方法是可行的,能够在车上使用。

Automatic Mechanical Transmission Control Research Based on Torque on Low Tire-road Friction Condition

From the limited parameter of automatic mechanical transmission(AMT) control system,the road friction and slipping status of tires should be estimated,and tire slipping should be avoided by control;Calculating the vehicle reasonable acceleration by engine torque,transmission parameter and vehicle status,comparing with the wheel speed acceleration,it will confirm the wheel slipping status.The road friction can be confirmed by wheel acceleration rate.Tire driving slipping would be avoided by the control of decreasing engine torque and separating clutch when tire slipping;The road friction could be recognized by doing experiment on vehicle.The vehicle performance on low tire-road friction condition is upgraded by engine torque and clutch control when slipping.The results show that this method of friction recognized and slipping control is correct and can be used on vehicle.