A vehicle air management system is provided. The vehicle air management system comprises an air tank and a boost air tank. Based on a signal indicative of an air consumption level of at least one air consumer, a control unit is configured to control the vehicle air management system to deliver pressurized air from the boost air tank to be supplied to an air compressor.

An air suspension system includes a controller that controls opening/closing of normally-closed electromagnetic switching valves constituting a control valve, a first supply/discharge switching valve, a second supply/discharge switching valve, a first tank switching valve, and a second tank switching valve. The controller controls opening/closing of the electromagnetic switching valves in an order of first control, second control, and third control. In the first control, the control valve is opened. In the second control, the first supply/discharge switching valve and the second supply/discharge switching valve are opened in an opened state of the control valve. In the third control, the control valve, the first supply/discharge switching valve, and the second supply/discharge switching valve are closed.

A dryer circuit for a pneumatic regulating device of a vehicle, comprising an air dryer, and a first compressor, wherein the first compressor is designed to compress system air present in the pneumatic regulating device, wherein the air dryer, the first compressor and subsystems, which can be connected to the first compressor, of the pneumatic regulating device are arranged in such a way that, in the operating mode of a closed air supply, air delivered between the components of one of the subsystems by the first compressor is delivered so as to bypass the air dryer.

An air suspension apparatus includes a compressor configured to compress air, a tank configured to store the air, a tank-side suction conduit configured to supply the compressed air in this tank to an intake side of the compressor, a tank conduit connecting a discharge side of the compressor and the tank, an air suspension connected to the discharge side of the compressor via an air drier, an intake electromagnetic valve provided in the tank-side suction conduit, a return electromagnetic valve provided in the tank conduit, and a discharge conduit provided so as to branch off from between the discharge side of the compressor and the air drier and configured to be connected to an atmosphere by opening a discharge electromagnetic valve.

A vehicle-height control system includes: a vehicle-height control actuator; a pressure-medium supply and discharge device configured to supply and discharge a pressure medium; and a vehicle height controller configured to control a vehicle height by controlling the pressure-medium supply and discharge device. The pressure-medium supply and discharge device includes a compressor and a tank configured to contain a pressure medium supplied from the compressor. The vehicle height controller includes a down controller configured to operate the compressor to discharge and supply the pressure medium from the vehicle-height control actuator to the tank to lower the vehicle height when a tank pressure is less than a set pressure. The down controller is configured to discharge the pressure medium from the vehicle-height control actuator to an outside to lower the vehicle height when the tank pressure is greater than or equal to the set pressure.

A vehicle height adjustment apparatus includes: vehicle height adjustment units respectively provided to correspond to wheels of a vehicle body, and adjusting a vehicle height in response to the supply and discharge of a working fluid; a pressure tank storing the working fluid; a compressor pressure-feeding the working fluid; a valve body block formed by opening and closing valves, and interposed between the pressure tank and the compressor, and the vehicle height adjustment units; and a control unit adjusting a vehicle height by controlling the valve body block, wherein the valve body block is connected to the pressure tank, and working fluid outlet and inlet of the compressor, and upon the completion of the pressure feed of the working fluid, the control unit controls such that the working fluid outlet and inlet are communicated with each other.

An air suspension system includes: an air suspension interposed between a vehicle body and an axle to adjust a vehicle height according to supply and exhaust of air; a compressor that compresses air; a tank that stores the air compressed by the compressor; and an air dryer provided on an ejection side of the compressor. When the tank has a predetermined pressure or less after air is supplied from the tank to the air suspension, a pressure of the tank is increased by the compressor.

A vehicle height control apparatus includes an information acquisition device that acquires pressure data on a pressure inside an air tank storing compressed air and obstacle data on an obstacle in front of a vehicle, and a controller that calculates a target vehicle height based on the obstacle data, calculates a required distance required to reach the target vehicle height based on the pressure of the compressed air inside the air tank, and determines a vehicle height control timing, resolving a problem that the vehicle height is unnecessarily quickly controlled compared to the position of the obstacle, or is controlled after the vehicle passes through the obstacle to reduce the ride comfort.

An air supply device control system may include a sensor configured to detect a trailer to be provided in an eco-friendly commercial vehicle, an air supply device configured to compress and supply air, and a controller electrically connected to the air supply device and configured to control rotation speed of the air supply device to control the air of the air supply device, wherein the controller increases the rotation speed of the air supply device based on whether the trailer is provided in the eco-friendly commercial vehicle, which is detected by the sensor.

An air suspension system for a motor vehicle and a method of operating thereof includes an air suspension device for adjusting a ride-height position of the motor vehicle by the feeding and removal of compressed air into a plurality of air springs. The system also includes a dryer supplied via a compressed-air supply unit which has a compressor driven by an electric motor. A control unit for performing a ride-height control function has instruction for: raising the ride-height position to a first ride-height position; subsequently lowering the ride-height position to a second ride-height position; checking a first condition whether a determined air quantity ratio is less than a first predetermined air quantity limit value; checking a second condition whether a saturation level of the dryer is greater than a saturation limit value, and activating the ride-height control function when either the first or the second condition is satisfied.