Principles of Anti-lock Braking System

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Principles of Anti-lock Braking System The reason for the development of anti-lock braking system is very simple. Under braking, if one or more of a vehicle’s wheels lock then this has a number of consequences: a) braking distance increases, b) steering control is lost, and c) tire wear will be uncommon. The tangible outcome is that an accident is more likely to occur. The application of brakes creates a force that impedes a vehicles motion by applying a force in the opposite direction. During severe braking scenarios, a point is obtained in which the tangential velocity of the tire surface and the velocity on road surface are not the same such that an optimal slip which corresponds to the maximum friction is obtained. The ABS controller must deal with the brake dynamics and the wheel dynamics as a whole plant. A locked-up wheel provides low road handling force and minimal steering force. Therefore, the main benefit of ABS operation is to maintain directional control of the vehicle during emergency braking. Anti-lock Braking System Control The designer of the Anti-lock Brake controller has to face severe difficulties while designing the system: • For optimal performance, the controller must operate at an unstable equilibrium point • Depending on road conditions, the maximum braking torque may vary over a wide range • The tire slippage measurement signal, critical for controller performance, is both highly uncertain and noisy • On rough roads, the tire slip ratio

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