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Variable Ride-Height Suspension

Variable Ride-Height Suspension

Depending on conditions such as vehicle speed and terrain, Variable Ride-Height Suspension (VRHS) raises or lowers the ride height of the vehicle while it is in motion. Some VRHS systems operate automatically, while others require the driver to select the appropriate mode. VRHS systems can have a favorable effect on a vehicle's likelihood to roll over because they lower the height of the vehicle's center of gravity and improve its Static Stability Factor (SSF) rating for highway driving.

Image: Suspension raises/lowers based on speed terrain.

VRHS systems exist under many trade names, including Electronic Height Control (EHC), Active Height Control (AHC), and pneumatic suspension systems.

How VRHS Works

In general, during off-road, lower-speed conditions, the vehicle will ride higher to allow for increased ground clearance. During on-road, higher speed conditions, the vehicle will ride lower. The vehicle riding lower by several inches is less top-heavy, has a higher SSF, and is less likely to roll over in a crash.

This article was published on Sunday 29 January, 2006.
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