An air suspension system includes air suspensions (1, 2) performing vehicle height adjustment in response to supply and discharge of air, a compressor (3) compressing air, a tank (4) storing compressed air, a first passage (6) connecting between the delivery side of the compressor and the tank, and a second passage (7) connecting between the delivery side of the compressor and the air suspensions. A first dryer (10) is provided in the middle of the first passage to dry air flowing through the first passage. A second dryer (11) is provided in the middle of the second passage to dry air flowing through the second passage. Thus, compressed air generated from ambient air sucked in by the compressor can be dried by the second dryer and supplied directly into the air chambers of the air suspensions.

An air management system for a vehicle having a first pneumatic circuit and a second pneumatic circuit, in which the first and second pneumatic circuits are pneumatically connected in a neutral position via a cross-flow mechanism. The first pneumatic circuit includes a first leveling valve configured to adjust independently the height of a first side of the vehicle. The second pneumatic circuit includes a second leveling valve configured to adjust independently the height of a second side of the vehicle. The first and second leveling valves are configured to establish pneumatic communication between the first and second pneumatic circuits when the first leveling valve is not independently adjusting the height of the first side of the vehicle and the second leveling valve is not independently adjusting the height of the second side of the vehicle.

A vehicle height control apparatus considering a strong wind traveling situation may include: a strong wind zone determining unit for obtaining wind speed information of a current position by using map information to which the wind speed information is corresponded and current position information of a vehicle, and generating strong wind zone information by comparing the obtained wind speed information with a predetermined reference wind speed to determine a strong wind zone; a strong wind traveling situation determining unit for generating strong wind traveling situation information by determining the strong wind traveling situation based on the strong wind zone information and the vehicle speed information of the current position; and a control signal generating unit for generating a control signal of a vehicle height adjusting device according to the strong wind traveling situation information.

A bogie positioning system and method for a work machine. The bogie positioning system adapted to selectively engage a wheel of a work machine to a ground surface through a bogie assembly wherein the bogie assembly may have a front wheel coupled to a rear wheel through a bogie coupling mechanism. The bogie coupling mechanism comprising a beam with a rotary joint. The rotary joint allowing the front wheel to rotate about a rotary axis relative to the rear wheel. The beam is coupled to a chassis of the work machine with at least one actuator coupled to the beam. A control unit is in communication with the bogie assembly, a user input interface, and a plurality of sensors, generating command signals to actuate the actuator based on the input signals, thereby selectively engaging the front wheel or the rear wheel with the ground surface.

A mechanically actuated level control valve device for a commercial vehicle with an air suspension system is a level control valve and comprises a drive element that can be mechanically coupled to a vehicle wheel or axle. A valve element and a counter valve element have a first relative position, wherein the port for the air suspension bellow is closed, a second relative position, wherein the port for the air suspension bellow is connected to the port for the aeration device, and a third relative position, wherein the port for the air suspension bellow is connected to the port for the deaeration device. The valve element is coupled to a rotatable driveshaft of the level control valve by a drive mechanism. An integrated actuator changes the relative position of the valve element and the drive element or the relative position of the counter valve element and a valve housing.

A vehicle height adjustment apparatus for a suspension according to an exemplary embodiment of the present disclosure includes: a piston rod having a thread on an outer circumferential surface thereof; a shock absorber in which the piston rod is installed to be movable up and down; a top mount connecting the piston rod to a vehicle body; a first spring having one side connected to the top mount and a remaining side connected to the shock absorber; a second spring having one side connected to the shock absorber; and a driving module connected to a remaining side of the second spring and installed to be movable on the piston rod by being fastened to the thread of the piston rod.

An air suspension system includes a tank, a tank-side open/close valve, an air suspension-side open/close valve, a system portion, and the like. The system portion includes a compressor, an air drier, and a first passage and a second passage provided between the tank-side open/close valve and the air suspension-side open/close valve in parallel, a discharge valve, a tank-side control valve, an air suspension-side control valve, and the like. Due to this configuration, the air suspension system regenerates the air drier by opening the discharge valve to thus cause the air in the second passage to flow from an opposite side toward one side of the air drier when no power is supplied to the tank-side control valve and the air suspension-side control valve.

A levelling valve assembly for an air suspension system of a heavy vehicle is provided, including an air valve configured to allow air to either enter or escape from an air spring based on a position of a control arm of the air valve, and including a linkage rod assembly configured to translate movement between a sprung and unsprung mass of the vehicle into a rotation of the control arm to regulate a ride height of the vehicle. The linkage rod assembly further includes a spring and damper arrangement configured to dampen or block movement of the control arm not caused by a change in a mass loading of the vehicle.

A vehicle height adjustment device includes: vehicle height adjustment actuators provided to at least a pair of front wheels or a pair of rear wheels of a vehicle, and configured to adjust a vehicle height defined by a distance between the wheels and a vehicle body; an actuator control device configured to control the vehicle height adjustment actuators such that the vehicle height approximates to a target vehicle height; and a detection device configured to detect a physical quantity which varies as upward or downward movement of the vehicle body is restricted due to contact with an external contacted object. The actuator control device stops upward or downward movement of the vehicle body, and switches to movement in an opposite direction based on a detected value of the detection device, when the determination that the movement of the vehicle body is restricted is made by the detection device.

A suspension device for a wheeled vehicle with a plurality of air springs is described. Two main air chambers of two air springs of a respective vehicle axle are connected together via a transverse air chamber which forms an intermediate volume. A compressor arranged between the two transverse air chambers is connected to the first transverse air chamber via a first connecting line in which a first switchable valve is arranged, and to the second transverse air chamber via a second connecting line in which a second switchable valve is arranged, so that direct filling/direct evacuation of the intermediate volumes of the two transverse air chambers is possible.