Disturbances such as vehicle load, state of the road, tyre condition and
brake system condition.
From the wheel speed sensors the ECU calculates the following:
Vehicle reference speed
Determined from the combination of two diagonal wheel sensor signals. After
the start of braking the ECU uses this value as its reference.
Wheel acceleration or deceleration
This is a live measurement that is constantly changing.
Brake slip
Although this cannot be measured directly, a value can be calculated from
the vehicle reference speed. This gure is then used to determine when/if
ABS should take control of the brake pressure. ...
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