A high-quality SUV should have both the comfort of a sedan and the passability of an OFF-road vehicle, and the air suspension system is the best choice to achieve this goal.  Air suspension is mainly composed of control computer, suction hole, exhaust hole, pneumatic shock absorber and air suspension valve.  Control body horizontal attitude: adjust the body of the stability system.  

In daily regulation, air suspension will have several states.  

1. Stay in the zone.  When the vehicle is lifted by the lift, leaving the ground, the air suspension system will close the relevant solenoid valve, while the computer memory height, so that the vehicle after landing to maintain the original height.

2. normal state, that is, the engine running state.  In the process of driving, if the body height changes beyond a certain range, the air suspension system will adjust the body height at intervals.

3. wake up state.  When the air suspension system is awakened by a remote key, door switch or trunk lid switch, the system checks the height of the car through the body level sensor.  If the height of the car is lower than the normal height, the air tank will provide pressure to raise the car to the normal height.  At the same time, the air suspension can adjust the stiffness of the shock absorber, including soft, normal and hard three states (there are also marked as comfortable, ordinary, sports three modes, etc.), the driver can control through the control button in the car.  

Comparing with traditional suspension, due to the air type adjustable suspension structure is relatively complex, the failure probability and frequency will be higher than that of helical spring suspension system, and USES air as power source of adjust the ride height, sealing is also a problem of related parts, in addition, if frequently adjust the ride height, and may cause local overheating pump system,  Will greatly shorten the service life of the air pump.  Of course, with the continuous improvement of the technical level, many problems have been well solved, at the same time, it is applicated for more and more cars.