Whatever you call it - rollover protection, electronic stability control or ESC - the goal is the same: Keeping drivers safe when instability in a vehicle is detected.
A rollover protection system automatically applies the brakes to individual wheels to help keep a vehicle from tipping over, especially during cornering.
These systems use the vehicle's antilock brakes and traction control systems, features that already are commonly available.
On most GM and Chrysler group vehicles, engineers will add another sensor that measures the rotation of the car body, such as when a vehicle swerves.
Ford Motor Co.'s system is a bit more advanced because it measures not only rotation but also excess yaw, which occurs when a vehicle leans too far one side.
Once the system detects rotation or twist, it checks to see if the vehicle is headed in the direction the driver is intending to go, based on the steering wheel position. If not, the system applies the brakes to one or more of the wheels to enable the driver to regain control.
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