Vehicle and Method to Control Rolling Engagements

The invention provides a vehicle and a method to control rolling engagements. When a vehicle driver selects reverse while a vehicle is moving forward, a transmission controller applies friction shift elements within the transmission to create a partial tie-up condition to decelerate the vehicle. Once the vehicle slows below a threshold speed, the controller engages a selectable one way brake and releases some of the friction shift elements to engage a reverse gear ratio. 本发明提供了种车辆和控制滚动接合的方法。当车辆驾驶员在车辆正在向前运动时选择倒挡时，变速器控制器应用变速器中的摩擦换挡元件来创建部分绑定的条件以使车辆减速。旦车辆减速到阈值速度以下，控制器便接合可选择的单向制动器并释放些摩擦换挡元件，以接合倒挡传动比。