A valve suitable for an air spring includes a housing body with a central longitudinal axis and channel. The housing body has a first valve opening fluidically connectable to an air spring volume, a second valve opening fluidically connectable to an air supply, which is fluidically connectable to an air spring volume, and a second valve opening which is fluidically connectable to an air supply. Each valve opening is fluidically connected or selectively connectable to the channel. A pressure limiter is provided to limit the pressure flowing out of the second valve opening, the pressure limiter including a third sealing agent and a second sealing agent associated with the second valve opening and selectively closing an opening, wherein pressurization of at least the third sealing agent displaces the second sealing agent due to the forced coupling such that it closes the corresponding opening or reduces the effective opening cross-section.

A vehicle includes an outside sensor configured to acquire information on an outside circumstance of the vehicle, a vehicle height adjusting device configured to adjust a vehicle height, and a control device configured to control the vehicle. The control device is configured to control the vehicle height adjusting device such that the vehicle height becomes a vehicle height corresponding to a platform condition at a predetermined stop position when the vehicle stops at the predetermined stop position. The control device is configured to control the vehicle height adjusting device based on a height of an obstacle such that the obstacle does not interfere with the vehicle when the obstacle is detected at the predetermined stop position by the outside sensor.

A method for operating a pressure control system having a multistage compressor. The method comprises providing a pressure medium compressed multiple times by the multistage compressor in order to fill a pressure medium reservoir or pressure medium chambers of the pressure control system, by performing (i) providing, by a first compression stage, a precompressed pressure medium and additionally compressing the precompressed pressure medium via a second compression stage, and/or (ii) introducing, into an intermediate volume between the first compression stage and the second compression stage of the multistage compressor, an already compressed charge pressure medium and compressing, by the second compression stage, the charge pressure medium again. An intermediate pressure of the precompressed pressure medium conveyed into the intermediate volume is limited by an overpressure valve interacting with the first compression stage. The overpressure valve is configured to open if the intermediate pressure exceeds a limit value.

A shock absorber includes: a pressure tube defining a working chamber; a piston assembly slidably disposed within the pressure tube, the piston assembly dividing the working chamber into a first and second chambers; a piston rod including a first end that is attached to the piston assembly and that includes a second end that is configured to be attached to one of a sprung mass and an unsprung mass of a vehicle; an electronic valve that is positioned within the piston rod, the electronic valve including a spool moveable between first and second positions, where: when the spool of the electronic valve is in the first position, the spool allows fluid flow between the first and second chambers through the electronic valve and the piston rod; and when the spool of the electronic valve is in the second position, the spool restricts fluid flow between the first and second chambers.

An air pressure adjusting device includes a compressor configured to compress air taken in from outside, a dryer connected to the compressor and filled with a reversible dehumidifying agent, a connection port through which air dehumidified by the dryer is supplied to another device, an exhaust valve provided between the compressor and the dryer and configured to discharge air in the dryer, and a switch valve provided between the dryer and the connection port and configured to switch between a first flow path having a large air flow rate and a second flow path having a small air flow rate.

A pressure retaining valve including: a first valve body for an opening of an air spring, the first valve body having an access opening; a second valve body connected to the first valve body and having a chamber fluidly communicating with the access opening and having a side outlet opening; and a return member disposed outside the access opening in the chamber for providing a bias toward the access opening; a closure part disposed in the chamber and movable from a closed condition against the bias to an open condition; and an actuator part having a head portion, a shaft section, and a flow channel, the head portion disposed outside the access opening and having a larger diameter than the access opening, wherein the stem portion is movably disposed through the access opening into the chamber, and the actuator member can move the closure member out of the closed condition.

An apparatus and method for controlling an air suspension of a vehicle are disclosed. The apparatus includes a compressor configured to supply compressed air, a reservoir configured to store compressed air supplied from the compressor and to supply the stored compressed air to the air suspension during vehicle height control, a road information provider configured to provide road state information of a road in front of the vehicle during travel of the vehicle, and a controller configured to determine a vehicle height control position of the air suspension based on the road state information and to operate the compressor before the vehicle arrives at the determined vehicle height control position, thereby filling the reservoir with the compressed air such that an internal pressure of the reservoir reaches at least a predetermined reference pressure.

An example method includes receiving, at a first frequency, sensor information indicative of an actual pressure level of a pilot fluid signal in a pilot line connecting an outlet port of a pilot supply valve to a pilot port of a main valve; determining an estimated pressure for the pilot fluid signal in the pilot line at a second frequency greater than the first frequency; determining a pressure estimate error based on comparing the actual pressure level to the estimated pressure; determining a pressure level error based on comparing the estimated pressure to a commanded pressure value; and operating the pilot supply valve in an open state to provide the pilot fluid signal to the pilot port of the main valve until the pressure level error is less than a threshold value.

A pneumatic gauge and pressure control device includes a pneumatic gauge that is manually movable from a neutral position to: (i) a fill position for compressed air to flow from a compressed air source into a system; or (ii) a vent position for compressed air to be vented from the system. The pneumatic gauge can rotate or slide from the neutral position to the fill and vent positions. A method for controlling a flow of compressed air with respect to a pneumatic system includes manually moving a pneumatic pressure gauge from a neutral position to a fill position to cause compressed air to be communicated from an associated compressed air source into the pneumatic system and/or moving the pneumatic gauge from the neutral position or from the fill position to a vent position to cause compressed air to be vented from the pneumatic system.

A system and method are provided for configuring suspension ratios in a multi-rear axle vehicle, the vehicle having a drive axle suspension and at least one tag axle suspension, each suspension having one or more air springs. The timing of the performance of an adjustment cycle series of steps for adjusting the suspension height and air spring pressure readings is optimized by monitoring the acceleration of the vehicle and conducting the adjustment cycle steps when the vehicle acceleration is below an acceleration threshold. Additionally, air spring pressure adjustments may be scaled based on a confidence factor of the air spring pressure readings. Finally, a method is provided for configuring suspension ratios in a multi-rear axle vehicle, the vehicle having a drive axle suspension and at least one tag axle suspension, and for adjusting the air suspension pressures.