The biggest feature of the air suspension spring is that the elastic coefficient of the spring can be automatically adjusted, that is, the soft and hard spring can be adjusted according to the needs of the car. For example, when driving on the highway, the suspension can be hardened to improve the stability of the vehicle; if the vehicle is driving at a low speed, the control unit will soften the suspension, because the control unit thinks that the vehicle is passing through bumpy road when driving at low speed for a long time, so the suspension is adjusted to improve the shock absorption comfort.
Of course, the air spring is favored by luxury cars. It is not only the above feature, but also the perfect integration of traditional chassis lifting technology. At high speed, the body height will be automatically reduced to improve the stability of the vehicle at high speed and reduce the wind resistance and fuel consumption. In a word, the existence of air springs can ensure the smooth running of vehicles. I think this is one of the reasons why luxury cars are very comfortable.
As for why the air spring is only widely used in luxury cars, it may be because its price is higher than other traditional suspension. However, China is in the era of rapid development, I believe that before long, many ordinary models will be equipped with air suspension spring.