A vehicle and a height adjustment system for the vehicle are disclosed. A valve includes a member movable between a first position operating first and second piston mechanisms to raise an end of the vehicle to a first height, a second position operating the first and second piston mechanisms to lower the end of the vehicle to a second height and a third position maintaining the end of the vehicle at one of the first height and the second height. A first fluid line extends between the first piston mechanism and the valve to fluidly connect the first piston mechanism and the valve. Additionally, a second fluid line extends between the second piston mechanism and the valve to fluidly connect the second piston mechanism and the valve. The first fluid line and the second fluid line are fluidly connected to the valve independently of each other.

A vehicle-height adjusting system includes: vehicle-height adjusting actuators each for adjusting a vehicle height for a corresponding one of wheels; a pressure medium supplier for supplying a pressure medium from a tank to each of the vehicle-height adjusting actuators; and a vehicle height adjuster for adjusting the vehicle height for each wheel. The vehicle-height adjusting actuators include a left vehicle-height adjusting actuator and a right vehicle-height adjusting actuator. The vehicle height adjuster includes a supply amount controller configured to control the pressure medium supplier such that substantially the same amount of the pressure medium is to be supplied from the tank to the left vehicle-height adjusting actuator and the right vehicle-height adjusting actuator, when at least one of the wheels is in contact with an uneven road surface.

A vehicle height adjustment apparatus includes a spring, an adjustor, a storage chamber, a pump, and a flow path switching unit. The adjustor includes an accommodation chamber which accommodates liquid, and adjusts the length of the spring according to the amount of liquid in the accommodation chamber. The pump includes a cylinder. The flow path switching unit includes a first communication path through which the inside of the cylinder communicates with the storage chamber, a second communication path through which the inside of the cylinder communicates with the accommodation chamber, and a third communication path through which the accommodation chamber communicates with the storage chamber. The flow path switching unit switches the flow path of the liquid according to an amount of electric current supplied to the flow path switching unit.

A ride height adjustment of a vehicle traveling along a roadway is controlled by a controller which uses data about overpass clearances and the height of the highest point on the vehicle to lower vehicle height when the height can be lowered sufficiently to avoid collision with an overpass.

An air spring assembly or air spring damper with an integrated valve control for controlling a level position of a vehicle or of a driver's cab includes a rolling tube, a lid and an air spring bellows which together delimit a pressure chamber with compressed air. A control valve includes an actuation device for feeding compressed air into the pressure chamber or for discharging compressed air from the pressure chamber. A compression spring device has a first end operatively connected to the rolling piston or the lid and a second end operatively connected to the actuation device. The compression spring device is configured with at least two parts including a central spring facing towards the rolling piston or the lid and a control valve biasing spring facing towards the control valve. The central spring is biased to a greater extent than the control valve biasing spring.

A suspension system includes a spring support for a vehicle support spring. A spring collar supporting the vehicle support spring is selectively adjustable with respect to position by a pressurized-medium supply with the aim of adjusting the level of a vehicle body. The spring support is constructed as a hydropneumatic spring having a hydraulic volume, which can likewise be adjusted relative to a pneumatic storage element.

A vehicle suspension system for vehicle height adjustment comprises: a damper for adjusting a height of a vehicle with neutral pressure by driving a piston up and down in a space inside a damping cylinder in which fluid is accommodated to a pressurization region in a pressurization direction and a restoration region in a restoration direction; an actuator, connected to a flow path of the damper, for adjusting the neutral pressure of the damper; a two-way control valve that operates on and off to allow and block movement of the fluid in the damping cylinder and the fluid in the hydraulic cylinder in both directions; a reservoir for regulating gas pressure in the damping cylinder; and a control unit that controls a pressure of the motor pump of the actuator.

Two or more sensors positioned at a wheel of a stopped vehicle may detect an unwanted substance, and transmit signals, based on which a height level of the substance is determined. The system may also determine a type of the substance, such as water, snow, sand or mud, based on electrical resistance of the substance detected by the sensors. Cameras or other imaging equipment, including LIDAR, may also be used to determine the substance height and/or composition. Accordingly, actions to protect the vehicle may be taken, such as raising or lowering the ride height of the vehicle body using an adjustable suspension of the vehicle. Other protective actions may include closing vents, seals, valves and battery isolation units, and transmitting messages to a vehicle driver and/or to emergency personnel.

Two or more sensors positioned at a wheel of a stopped vehicle may detect an unwanted substance, and transmit signals, based on which a height level of the substance is determined. The system may also determine a type of the substance, such as water, snow, sand or mud, based on electrical resistance of the substance detected by the sensors. Cameras or other imaging equipment, including LIDAR, may also be used to determine the substance height and/or composition. Accordingly, actions to protect the vehicle may be taken, such as raising or lowering the ride height of the vehicle body using an adjustable suspension of the vehicle. Other protective actions may include closing vents, seals, valves and battery isolation units, and transmitting messages to a vehicle driver and/or to emergency personnel.

A driving robot may be provided and include: a base; a first driving wheel on a left side of the base; a second driving wheel on a right side of the base; and a plurality of caster units at a front and rear of the first driving wheel and a front and rear of the second driving wheel, respectively. Each of the plurality of caster units may include: a caster; and an air suspension configured to dampen the caster so as to be liftable by pneumatic pressure, and wherein the air suspension of a first caster unit among the plurality of caster units is connected to the air suspension of a second caster unit among the plurality of caster units by a single flow path.