MINI One D | Part Ten

Electronic guardian angels: BMW Group standard electronic brake control and stability systems are invaluable aids to the driver.

Four-sensor ABS, Electronic Brake Force Distribution (EBD), Cornering Brake Control (CBC) and Automatic Stability Control with traction control (ASC+T) are standard and work to keep MINI One D under complete control, whether the road conditions or driving style look like pushing the car past its limits. Dynamic Stability Control (DSC) is also available as an option.

Electronic Brake Force Distribution (EBD) controls the distribution of brake forces between the front and rear wheels. This allows the optimum use of the rear brakes, as it constantly monitors the load on the rear axle. EBD cuts in automatically long before ABS interacts and cannot be deactivated by the driver. Cornering Brake Control (CBC) prevents the car from becoming unstable when braking through corners. The electronic system detects side slip of the wheels – essentially lateral acceleration – via the ABS sensors if the car becomes unstable. This can occur if the brakes are applied heavily while cornering. The system recognises that the car is cornering and feeds more braking force to the outside front wheel when necessary, reducing the potential of any slide out of the corner. ASC+T traction control prevents front wheel spin. It uses the ABS sensors to detect any wheel slippage, automatically cutting power to the spinning wheel until it grips again. It can be deactivated by the driver looking to take the car to its limits. ASC+T is standard on MINI One D and an option on MINI One and MINI Cooper. Dynamic Stability Control (DSC) is available as an option. This is an even more sophisticated control system that prevents the car from oversteering or understeering. It is achieved through automatic brake applications to individual wheels and the momentary cutting of power to the engine. DSC monitors the ABS speed sensors on the wheels, brake pressure (whether, and how firm, the driver is applying the brakes), the steering wheel lock (to determine the direction the car is travelling) and lateral acceleration acting on the car. It therefore considers both the driver’s intentions and the current motion of the car, sensing whether the vehicle is deviating critically from the expected direction of travel. Individual brake applications and changes in the engine torque then correct any deviation. DSC counteracts oversteer by applying the brake, or increasing the brake pressure if the driver is already braking, on the outer front wheel. This reduces pressure on the wheels facing the inside of the bend, allowing them to grip and pull the car through the bend. To counteract understeer, the DSC control unit applies the brake on the inner rear wheel, taking brake pressure off the outer wheels, and pulling the car back into the bend.
continues... | Part Eleven
Published 1 June 2003 Melanie Carter

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