Thursday, November 24, 2011

Anti-lock braking system function (how does it operate)?

You have already a good set of answers and let me put a final touch to all of them.


When a vehicle's wheel is in a state of rolling then the friction with the ground is "Static". Once the wheel locks then the friction is "Dynamic" and of a reduced value and a consequent instability problem. The anti-lock braking system is to prevent any wheel from locking in the way so well explained by previous answerers.|||It doesn't allow the wheels to lock when braking. So if you break hard the system will clamp and release the breaks in a rapid succession so that the wheels could still spin while braking. This reduces the risk that they will start sliding.|||An electronic sensor detects when one or more of the car's wheels stops turning. The car's computer then eases back the break pressure on that wheel. It can do this multiple times per second. The end result is feels and sounds like a pulsing of the breaks, like a low pitch bass note. The action is similar to when you "pump the breaks" on a non ABS car, but the ABS is more precise.|||First answer is right but to add a little more detail... It requires a sensor which measures the rotation of the wheels, a system for controlling the hydraulic pressure in the brake cylinders, and a computer for processing the rotation data and signaling the hydraulic controls. When the brakes are applied hard and the wheel slows down, the computer monitors the rotation and starts pulsing the hydraulic pressure to allow the wheel to continue to turn. The max braking effect happens just before the tire starts to slide on the road so the system is designed to keep the tire right on the edge of sliding. If you want to feel it work, pick a time and place where there are no other cars around and where there is snow or ice or sand on the pavement (very slippery conditions). Slam on your brakes when your tires are on this slippery stuff and you can feel the hydraulic pressure pulsing in the brake pedal.|||In addition to the other answers, another advantage of keeping all four wheels turning is that you also maintain steering authority during a panic stop so that you can continue to steer around obstacles. when the front wheels stop turning, they lose all steering authority.

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