Putting the Brakes on Rollovers

A new take on stability control keeps all four wheels planted

by Jason Lee
1. Roll Stability Control helps drivers manage sharp changes in driving conditions. Here, the red axes illustrate the degree of roll, as measured by a gyroscopic body-roll sensor [A]. The computer [B] pulses the right front brake [C] to prevent a skid as the driver begins to swerve to his left of the ball.Jason Lee
by Jason Lee
3. The calculated, selective braking stops the vehicle from swaying dangerously out of control. As the SUV returns to a level plane, the RSC's computer releases the brakes and hands control back over to the driver.Jason Lee
by Jason Lee
2. As the driver steers around the ball, the body-roll sensor detects that the right front wheel is about to leave the ground. Then the computer activates the left front brake [D] to check momentum and prevent a potential skid. An SUV without RSC [ghosted above] could continue tipping and roll over.Jason Lee