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How does the ABS system work?

The ABS system is an obligatory equipment for all newly sold passenger cars since July 2006.

The principle of its operation is based on continuous analysis of the speed of individual wheels in the car. In older constructions, magneto-inductive sensors matched speed measurement. They were quite durable and easy to check, eg by measuring the voltage they generated, but not very accurate. Information about the speed of the vehicle appeared from about 5 km / h.

At present, sensors responsible for this task are based on the Hall effect or magneto-resistive sensors, which are not only able to measure the speed practically from scratch, but are also able to provide information about the direction of rotation of the wheel. ABS can only work when braking, when it detects that one of the wheels is slower than the others. It then drops the brake fluid pressure for this wheel in four-channel systems until it reaches the correct speed. The pressure jumps associated with its reduction for individual wheels are felt by the driver as a pulsing of the brake pedal. For ABS to be effective, the initial braking force must be as strong as possible. Unfortunately, most drivers, when the brake pedal starts to tremble, reduce the pressure on it – that is why in some cars systems are used that in case of sudden brake detection keep the brake fluid pressure at the appropriate level. And although it happens that ABS can extend the braking distance, for example on very slippery surfaces, in most situations it allows us to maintain the ability to drive the vehicle even in the case of very strong and violent braking.

Therefore, caring for its efficiency in the car should be just as obvious as the fact that we only pour brand oils into our engine, such as Total. Because when it comes to the safety of both the driver and passengers as well as the engine, there is no room for compromise.


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