Patent ID: 7731203
Filing Date: 2010-06-08
Classification: B60G,Y10T

Abstract:
1. A method for air quantity control in a closed pneumatic spring system in a vehicle, in which method a compressed air pump supplies at least two pneumatic springs and/or a compressed air store on demand with an air quantity of such a magnitude that a high air pressure prevails in the respective pneumatic spring and/or in the compressed air store such that a vehicle body which is supported on the pneumatic spring is at a desired distance from the underlying surface or from the vehicle axle, the method comprising the steps of measuring a pneumatic spring pressure (P) in at least two of the pneumatic springs, determining the distance (HN, NN, TN) between the vehicle body and the underlying surface or the vehicle axle, determining an axle load (AL) of a vehicle axle from the pneumatic spring pressure (P) and the distance (HN, NN, TN) from the vehicle body to the underlying surface or to the vehicle axle, determining a nominal system air quantity value (PV_SOLL) as a function of the axle load (AL), and adjusting an actual system air quantity to said nominal system air quantity value (PV_SOLL) by actuating the compressed air pump to increase the actual system air quantity or by actuating a relief valve to reduce the actual system air quantity.