METHOD FOR DETERMINING AN UPWARD JOURNEY FOR ALL-WHEEL DRIVE VEHICLES

摘要

The invention relates to a method for determining an upward journey of an all-wheel drive vehicle, whereby vehicle acceleration is determined and gravitational acceleration is measured. The invention is characterised by the following steps in order to improve the precision of the determination of the vehicle reference speed in all-wheel drive vehicles: determination of the acceleration on the secondary axle (Tc4wdHaAcc) from one or two wheel velocities; determination of the declination (Slope) between the acceleration on the secondary axle (Tc4wdHaAcc) and the measured acceleration (LoSenAcc); filtering the determined declination (SlopFilt) with a time constant (T1SLOPE), comparison of the declination (Slope) to the filtered declination (SlopFilt), determination of the driving situations which display the states traction control active' or traction control inactive', determination of the gradient depending on the comparative results and the driving situation.