Motor vehicle hill holder system in which a minimum engine set of torque is determined when the vehicle is stationary and the engine torque is then monitored until it exceeds the minimum, at which point the brakes are released

摘要

Method for preventing a motor vehicle from rolling back when it is driving up a hill, whereby the brake pressure is kept at a high level until the engine torque (MANTR) has reached a minimum level (Mmin). The method has the following steps: determination of the wheel longitudinal force and the vehicle inertia force when stopped; calculation of a minimum torque value based on the measured values; calculation of the engine torque when setting off; and releasing of the brakes when the engine torque exceeds the minimum torque. An Independent claim is made for a system for preventing a motor vehicle from rolling back on a hill.