An air suspension system, comprising a manifold, defining a first and second port, each port defining a receiving region at the second end, wherein the first and second ports are arranged in a common plane, a channel intersecting the first and second port, a cavity intersecting each port, and a pressure sensor port, positioned between the first and second port, defining a sensor insertion axis normal to the common plane, the pressure sensor port separated from the first port, the second port, and the channel by a thickness; a first and second solenoid valve, each solenoid valve arranged within the cavity and coaxially arranged with the first and second ports, each solenoid valve comprising a connector; a pressure sensor arranged within the pressure sensor port, the pressure sensor comprising a connector; and an electronics module arranged parallel the common plane, the electronics module configured to electrically couple to the connectors.

An air spring suspension system includes a first air spring that has a first volume with a first pressure that is configured to provide a first spring stiffness to a first suspension assembly. A second air spring has a housing with a second volume with a second pressure that is configured to provide a second spring stiffness to a second suspension assembly. The second air spring includes a piston that is arranged in the second volume. One of the housing and the piston includes a first mounting structure that is configured to connect to a vehicle chassis. Another of the housing and the piston includes a second mounting structure that is configured to connect to the second suspension assembly. The second air spring also includes a fluid connection on the housing. The second air spring further includes a crosslink valve that is disposed in the housing and movable between open and closed positions. The crosslink valve is configured to selectively fluidly connect the second volume to the fluid connection. A crosslink line is fluidly connected to the first volume of the first air spring and the fluid connection on the second air spring. A controller is in communication with the crosslink valve. The controller is configured to command the crosslink valve between the open and closed positions in response to an input.

An air suspension system, comprising a manifold, defining a first and second port, each port defining a receiving region at the second end, wherein the first and second ports are arranged in a common plane, a channel intersecting the first and second port, a cavity intersecting each port, and a pressure sensor port, positioned between the first and second port, defining a sensor insertion axis normal to the common plane, the pressure sensor port separated from the first port, the second port, and the channel by a thickness; a first and second solenoid valve, each solenoid valve arranged within the cavity and coaxially arranged with the first and second ports, each solenoid valve comprising a connector; a pressure sensor arranged within the pressure sensor port, the pressure sensor comprising a connector; and an electronics module arranged parallel the common plane, the electronics module configured to electrically couple to the connectors.

An air suspension system, comprising a manifold, defining a first and second port, each port defining a receiving region at the second end, wherein the first and second ports are arranged in a common plane, a channel intersecting the first and second port, a cavity intersecting each port, and a pressure sensor port, positioned between the first and second port, defining a sensor insertion axis normal to the common plane, the pressure sensor port separated from the first port, the second port, and the channel by a thickness; a first and second solenoid valve, each solenoid valve arranged within the cavity and coaxially arranged with the first and second ports, each solenoid valve comprising a connector; a pressure sensor arranged within the pressure sensor port, the pressure sensor comprising a connector; and an electronics module arranged parallel the common plane, the electronics module configured to electrically couple to the connectors.

A trailer having a liftable first axle and an air suspended second axle includes a controller, a first valve coupled to the first axle and a second valve coupled to the second axle. The controller receives an air suspension exhaust request signal and a pressure signal from an air suspension bellows coupled to the second axle. The controller transmits an air suspension control signal to the second valve in response to the air suspension exhaust request signal and transmits a lift axle control signal to the first valve to lower the first axle in response to the pressure signal being less than a predetermined pressure value.

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.

An example valve assembly includes a mounting plate having an inlet port configured to be fluidly coupled to a source of fluid; a pilot supply valve mounted to the mounting plate, wherein the pilot supply valve comprises (i) an inlet port fluidly coupled to the inlet port of the mounting plate, and (ii) a first outlet port configured to be fluidly coupled to a pilot port of a main valve; and a pilot exhaust valve mounted to the mounting plate, wherein the pilot exhaust valve comprises (i) a vent port, (ii) a second outlet port that is fluidly coupled to the first outlet port of the pilot supply valve.

A pneumatic control system includes a manifold that defines: a channel for conveying a fluid, a discharge port, a drain port, and an expansion chamber defining a chamber axis. The discharge port defines a flow axis extending between a first end and second end and a receiving region at the second end. The pneumatic control system also includes a filter assembly with a filter member disposed in the expansion chamber, and an actuator configured to selectively control fluid communication between the channel and the discharge port. The chamber axis is substantially coplanar with the flow axis. A filter cap assembly includes a filter cap body enclosing an end of the expansion chamber and selectively removable from the manifold to provide access to the filter assembly. A purge valve body is configured to selectively control fluid flow between the expansion chamber and the drain port.

A vehicle fluid supply system includes a fluid supply valve configured to control fluid flow from a vehicle fluid supply to a trunk conduit in fluid communication with a vehicle tire inflation system; and a lift axle valve configured to control fluid flow from the trunk conduit to a lift axle deployment system.

An air suspension system, comprising a manifold, defining a first and second port, each port defining a receiving region at the second end, wherein the first and second ports are arranged in a common plane, a channel intersecting the first and second port, a cavity intersecting each port, and a pressure sensor port, positioned between the first and second port, defining a sensor insertion axis normal to the common plane, the pressure sensor port separated from the first port, the second port, and the channel by a thickness; a first and second solenoid valve, each solenoid valve arranged within the cavity and coaxially arranged with the first and second ports, each solenoid valve comprising a connector; a pressure sensor arranged within the pressure sensor port, the pressure sensor comprising a connector; and an electronics module arranged parallel the common plane, the electronics module configured to electrically couple to the connectors.