One is the aperture adjustment type, which changes the damping characteristics by adjusting the area of the throttle valve of the shock absorber. The change of aperture can usually be realized by solenoid valve or other similar electromechanical driven valves.
The other is an electrorheological or magnetorheological adjustable damper, whose working principle is to change the damping characteristics of rheological fluids by changing the intensity of electric or magnetic fields. Of these two structures, the former is technically mature, and many documents and patents have been published. The latter is a new technology. With the research and breakthrough of this technology, it may become a promising semi-active suspension form. ?
Switched damping suspension:
The common switchable damping suspension is generally set to two or three stages, and the damping coefficient can be quickly switched between several stages, and the switching time is usually10 ~ 20 ms. The control mode is usually to change the damping setting of the system according to the relative speed and absolute speed of the car body.
For two-stage suspension, the damping is set to two stages: hard and soft; For three-stage suspension, the damping is set to three levels: hard, medium and soft.
The damping coefficient of the continuously adjustable shock absorber of the continuously adjustable suspension can change continuously within a certain range, and there are two basic ways to realize it.