Yamaha FZ1-N 2007 Service Manual page 18

Manuals by Motomatrix / www.motomatrix.co.uk / The Solution For Lost Motorcycle Coded Keys
a. Friction force between the tire and road
surface
b. Brake force
c. Side force
d. Slip ratio (%)
Wheel slip and hydraulic control
The ABS ECU calculates the wheel speed of each wheel according to the rotation signal received
from the front and rear wheel sensors. In addition, the ABS ECU calculates the vehicle chassis
speed and the rate of speed reduction based on the wheel speed values.
The difference between the chassis speed and the wheel speed calculated in the slip ratio formula is
equal to the wheel slip. When the wheel speed is suddenly reduced, the wheel has a tendency to
lock. When the wheel slip and the wheel speed reduction rate exceed the preset values, the ABS
ECU determines that the wheel has a tendency to lock.
If the slip is large and the wheel has a tendency to lock (point A in the following figure), the ABS
ECU reduces the brake fluid pressure in the brake caliper. The ABS ECU increases the pressure of
the brake fluid in the brake caliper when the tendency to lock has diminished (point B in the following
figure).
a. Vehicle speed
b. Wheel speed
c. Pressurized
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e. Less slippery road surface
f. Controlling zone
g. Slippery road surface
d. Depressurized
e. Brake force
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