Patent ID: 8162620

Claim:
A method for regulating a compressed-air supply system of a motor vehicle, with the vehicle comprising a drive engine for driving a motor vehicle, which drive engine drives an air compressor via a drive connection or can be switched into such a drive connection for driving the air compressor, comprising the following steps: the air compressor is driven by the drive engine in a supply state and is connected on an air compressor air delivery side with the compressed-air system of the motor vehicle in such a way that the air compressor supplies compressed air to the compressed-air system; the air compressor is selectively not driven in the air supply state and/or is not connected with the compressed-air system; a setting of the air compressor in the supply state or a non-supply state being made depending on the comparison of at least one switch pressure value with a pressure in the compressed-air system; a topography of a route on which the motor vehicle moves is detected, with said topography containing a route profile which the motor vehicle needs to cover within a predetermined, directly impending time span and/or distance along a predetermined path of the travel; the at least one switch pressure value is determined depending on the topography that was detected; a first minimum pressure range is determined for a minimum pressure in the compressed-air system, with the first pressure range having a first minimum pressure bottom limit value and a first minimum pressure upper limit value; and the at least one switch pressure value is set to the first minimum pressure bottom limit value when the motor vehicle moves up an ascent and a performed automatic evaluation of the route profile excludes a permanently expected braking; and when the motor vehicle does not move up an ascent and/or the performed automatic evaluation of the route profile does not exclude any permanently expected braking, the at least one switch pressure value is set to a value between the first minimum pressure bottom limit value and the first minimum pressure upper limit value; then switching to the supply state when the pressure in the compressed-air system falls below the at least one switch pressure value.