HILL ROLLBACK SPEED CONTROL

摘要

A hill rollback control system and method for controlling a rollback speed of a motor vehicle with wheel brakes. Upon ascertaining that the vehicle is rolling back, the system and method determine, based on a grade angle of the terrain that the vehicle is traveling on and a temperature of a transmission, a target rollback speed for the vehicle. The target rollback speed is lower when the grade of the terrain is above a threshold value. Also, the target rollback speed is lower when the temperature of the transmission is above a threshold value. The actual rollback speed of the vehicle is set and maintained at the target rollback speed by applying the vehicle's wheel brakes.

主权项

1. A system for controlling a rollback speed of a motor vehicle having wheel brakes, the system comprising:
a driving direction arbitration module configured to receive a first signal and output an actual direction signal; a start/stop arbitration module configured to receive the actual direction signal and a gear shift signal, and generate a hill rollback control enable signal; a vehicle speed limit module configured to a receive a terrain grade angle signal, the vehicle speed limit module configured to set a target rollback speed signal to
a first predetermined value if a value of the terrain grade angle signal is equal to or below a grade threshold, anda second predetermined value if the value of the terrain grade angle signal is above the grade threshold, a vehicle brake control module configured to
receive the hill rollback control enable signal, the target rollback speed signal, and a vehicle speed signal, anddetermine a brake control signal to apply the wheel brakes to maintain the rollback speed of the vehicle at a value of the target rollback speed signal.