depending on the commercial vehicle and the number of controlled axles. Two-, three- and four-axle ABS systems are available. The pressure control valves are activated and regulate the brake pressure in the individual brake cylinders. Wheel delay and wheel slip signals are then used to determine the tendency of the individual wheels to lock. These can react very quickly to the wheels locking.
Microprocessors in the control unit use the speed and reference speed to calculate the slip on each individual wheel. Virtually all modern cars are fitted with microprocessor-controlled anti-lock braking systems (ABS). The speed sensor determines the wheel's rotation speed, which the electronic control unit converts into vehicle speed (reference speed). The braking pressure in each brake cylinder is reduced or held constant as necessary. This system prevents accidents like this, where you lose control of the steering. ABS has been required by law since 1999 on articulated trucks and truck-trailers above 3.5 tons overall weight and on buses with more than eight passenger seats.Īnti-lock braking systems consist of speed sensors, an electronic control unit and pressure control valves. Nowadays an anti lock braking system is used in almost all modern vehicles. On truck-trailers and articulated trucks, the ABS system also prevents jack-knifing of the trailer during emergency braking. Any vehicle equipped with ABS remains directionally stable and steerable even during emergency braking on slippery road surfaces, since the wheels do not lock (exception: Off-road ABS). Overview Some wheel speed sensors Brake calipers A hydraulic motor Some pressure release valves A quick thinking computer (or control module) which. An ABS anti-lock braking system prevents the wheels from locking by reducing the braking force. This ultimately results in the wheels locking (unstable range).
#ANTI LOCK BRAKING SYSTEM DRIVERS#
When equipped in a vehicle, an ABS reduces the chances of the following situations: Being involved in a fatal crash Sliding off the road Frontal collision In many of these instances, drivers attempted to lock out their brakes.
As greater braking force is applied, the slip continues to increase and traction is reduced. Anti-lock braking offers you a number of advantages, although the system is far from perfect. As slip increases, the usable traction also initially increases (stable range). How well braking forces are transferred depends on the traction and this in turn on the brake slip (sliding motion) between tyres and road. The trainer is designed to demonstrate ABS hydraulic and electrical system operation, as well as provide the ability to simulate changes in road conditions.
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