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3． System Functioning Theory
3.1 ABS Control Theory
3.2 ABS Control Mode
① Functioning Status of General Brake
For the vehicles equipped with ABS, if the braking pressure applied onto the wheels is not enough
to lock the wheels, the pressure generated by the general pump will transmit to the wheel branch
pump via the normal open valve to obtain the braking effects. When it’s unnecessary for further
braking, the driver will reduce the pressure on the brake pedal and then the brake liquid of various
wheels will return to the general pump to reduce the braking pressure.
Solenoid Valve Power Status Solenoid Valve Status
Normal Open Valve (NO Valve) OFF Open
Normal Close Valve (NC Valve) OFF Close
ABS Control Range
Slip Ratio
Pressure
Start
Pressure
Increment
Tire braking force (μs)
Body Speed – Wheel Speed
Body Speed
Skid Ratio
Tire transversal friction force
(μs
λ= 0%: The status that the brake is
not functioning
λ= 100%:
The s
are locked
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