ABS/EBS 101

18 May, 2017

ABS/EBS systems help maintain control over your vehicle in emergency braking situations. Essentially, ABS/EBS systems allow you to brake and steer at the same time by pulsing the brakes, instead of them just “locking up” and becoming uncontrollable.

This technology is a major factor for making our roads safer for all road users.

But first, what is an ABS/EBS sensor?

The ABS/EBS sensor is used for determining wheel rotation speed to prevent the dreaded lock up while braking. The inductive ABS/EBS sensor consists of a permanent magnet with a coil around it. The magnetic field strength changes when a magnetism sensitive object passes through the magnetic field.

There is actually a lot going on when you put your foot down on the brake. In most cases, the object used to influence the magnetic field on the sensor is an exciter ring with evenly distributed teeth, mounted on the drive shaft. When the exciter ring is rotating, the teeth pass the sensor and the pattern in which they pass is visible in the ABS/EBS sensor signal.

The frequency and amplitude of the signal depend on the rotation speed and the amount of teeth on the ring. Essentially, the sensor tracks how quickly the wheels are rotating and will react automatically once the wheels suddenly stop rotating (ie. when you brake suddenly).

When a wheel clearly has a lower speed than the other wheels, or decelerates faster than the vehicle could, the ECU (Electronic Control Unit that monitors the sensor) lowers the brake pressure for that particular wheel. This results in a wheel speed increase and prevents skidding, and allows the driver more control.

When necessary, the brake pressure is continuously adjusted multiple times per second until the vehicle nearly stops and the signal voltage falls below the sensor threshold.

This creates the pulsing effect on the brakes, instead of it being stuck in a locked position.

Our ABS/EBS sensors have been tested 10 times during the manufacturing process and subjected to harsh bump and environmental tests to emulate the tough Australian conditions.

If you have any questions about ABS/EBS sensors, you can get in touch with our team here.

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