An air valve assembly housing, in particular an air valve assembly, is for an air valve assembly of a commercial vehicle air suspension system. The air valve assembly housing includes an air exhaust chamber and an actuator chamber configured to accommodate a pneumatic actuator. The pneumatic actuator has a valve body that is configured to move between a closed position and an open position. The air valve assembly housing includes a fluid passageway that extends from the actuator chamber to the air exhaust chamber such that the actuator chamber and the air exhaust chamber are in fluid communication at least when the valve body is in the open position. A number of radially extending protrusions partially obstruct the fluid passageway.

A tire inflation control system for a vehicle includes: a manifold defining: a channel configured to be connected to a fluid source, and a discharge port configured to be connected to one or more tires of a vehicle; an actuator configured to selectively control fluid communication between the channel and the discharge port; a pressure sensor configured to measure a fluid pressure in the discharge port; and an electronics module in communication with the pressure sensor and configured to command the actuator to selectively control fluid communication between the channel and the discharge port and based on the fluid pressure in the discharge port, and to thereby control inflation of the one or more tires connected to the discharge port.

A vehicle stabilization system including a frame; a wheel; a control arm connected to the frame and the wheel; a fluid spring connected to the frame and the control arm; a stabilizer connected to the frame and operable between a retracted and extended position; a reservoir; and a fluid manifold connected to the fluid spring and the chamber, fluidly coupling the spring interior and stabilizer chamber to the reservoir interior. A vehicle stabilization method including maintaining an orientation of the vehicle frame, coupling the frame to a support surface using a stabilizer by introducing a fluid to a chamber of the stabilizer, and retracting a wheel by reducing a quantity of fluid within a fluid spring coupling the wheel to the frame.

A tire inflation control system for a vehicle includes: a manifold defining: a channel configured to be connected to a fluid source, and a discharge port configured to be connected to one or more tires of a vehicle; an actuator configured to selectively control fluid communication between the channel and the discharge port; a pressure sensor configured to measure a fluid pressure in the discharge port; and an electronics module in communication with the pressure sensor and configured to command the actuator to selectively control fluid communication between the channel and the discharge port and based on the fluid pressure in the discharge port, and to thereby control inflation of the one or more tires connected to the discharge port.

A control apparatus for heavy-duty vehicle lift axle/suspension systems, the control apparatus comprising a source of fluid pressure, a primary controller, and a secondary controller. The primary controller is located remote from the lift axle/suspension system. The secondary controller is located proximate to the lift axle/suspension system and the source of fluid pressure and is in fluid communication with the primary controller, the source of fluid pressure, and at least one lift bag and at least one air spring of the lift axle/suspension system. The secondary controller includes a pilot-operated poppet assembly and a discrete or integrated relay valve assembly wherein the primary controller transmits at least a pneumatic pilot signal to the secondary controller in order to selectively inflate and deflate the at least one air spring and the at least one lift bag to selectively control and maintain the extension and retraction of the lift axle/suspension system.

A tire inflation control system for a vehicle includes: a manifold, an actuator, a pressure sensor, and an electronics module. The manifold defines: a channel for connection to a fluid source, a discharge port, an electrical connector housing configured to selectively couple to an external wiring harness. The actuator selectively controls fluid communication between the channel and the discharge port. The pressure sensor is configured to measure a fluid pressure in the discharge port. The electronics module has a multi-conductor interface with a plurality of conductors that extend to the electrical connector housing to provide connection to one or more external systems, and is in communication with the pressure sensor to command the actuator to selectively control fluid communication between the channel and the discharge port based on the pressure in the discharge port, to thereby control inflation of one or more tires connected to the discharge port.