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An active suspension is a type of automotive suspension that uses an onboard control system to control the vertical movement of the vehicle's wheels and axles relative to the chassis or vehicle frame, rather than the conventional passive suspension that relies solely on large springs to maintain static support and dampen the vertical wheel movements caused by the road surface.
Toyota Active Control Suspension was (according to Toyota) the world's first fully active suspension. [1]Two versions of Toyota's Active Control Suspension system went into production - the first was a very limited production run from 1990 to 1991 of 300 units of the ST183 Celica, called the Active Sports. [2]
If suspension is externally controlled, then it is a semi-active or active suspension — the suspension is reacting to signals from an electronic controller. For example, a hydropneumatic Citroën will "know" how far off the ground the car is supposed to be, and constantly resets to achieve that level, regardless of load.
The prototype's anti-roll system was used in Formula 1 and the Esprit could reportedly corner at 1.5G.
This married Citroën's famous hydropneumatic suspension system to sophisticated electronics, enabling the handling of the car to automatically adapt to how it was being driven as well as virtually eliminating body roll (one of the main criticisms of Citroën's hydropneumatic system was the amount of body roll).
The semi-active suspension system was widely used on luxury and top sport trim packages on most of Toyota's products sold internationally. Its popularity fell after the “ bubble economy ” as it was seen as an unnecessary expense to purchase and maintain, and remained in use on luxury or high performance sports cars.
For example, in the state of Georgia, not only are these two scenarios an option for limited suspension, but you are still permitted to drive to and from a driver’s safety class or court ...
Automotive suspension design is an aspect of automotive engineering, concerned with designing the suspension for cars and trucks. Suspension design for other vehicles is similar, though the process may not be as well established. The process entails Selecting appropriate vehicle level targets; Selecting a system architecture