Patent ID: 8448951

Claim:
A closed ride control system for vehicles by which a vehicle body is suspended with respect to at least one vehicle axle, said system comprising: pressure medium chambers which are connected via branches to a first pressure medium line, a compressor, an air dryer which is arranged in a second pressure medium line, a pressure medium reservoir which is connected via the compressor to the pressure medium chambers in such a manner that: (a) pressure medium is configured to be transferred from the pressure medium reservoir via the compressor into each pressure medium chamber, a compressor inlet being connected to the pressure medium reservoir via a third pressure medium line and a first directional valve, and the compressor outlet being connected to one or more of the pressure medium chambers via a fourth pressure medium line and a second directional valve, (b) pressure medium is configured to be transferred from each pressure medium chamber via the compressor to the pressure medium reservoir, the compressor inlet being connected to one or more of the pressure medium chambers via a fifth pressure medium line and the second directional valve, and the compressor outlet being connected to the pressure medium reservoir via the second pressure medium line and the first directional valve, and that (c) a sixth pressure medium line which is connectable to the atmosphere and is connectable via a third directional valve, the second directional valve and the fifth pressure medium line to the compressor inlet, and is connectable via the second directional valve, the fourth pressure medium line and the first directional valve to the pressure medium reservoir, wherein a first non-return valve is arranged in the second pressure medium line between an outlet of the air dryer and the first directional valve in order to connect the outlet of the air dryer to the pressure medium reservoir, in that the fourth pressure medium line branches off from the second pressure medium line at the outlet of the air dryer and upstream of the first non-return valve, and in that a second non-return valve and/or a throttle is/are arranged in a seventh pressure medium line, wherein the seventh pressure medium line branches off from the second pressure medium line at a point between the first non-return valve and the first directional valve and opens in the air dryer, the second non-return valve blocking in the direction from the air dryer to a connection to the second pressure medium line.