ABS with EBD Operation

Based on the signals received from the 4 wheel speed sensors, the skid control ECU calculates each wheel speed and deceleration, and checks wheel slipping conditions. And according to the slipping condition, the skid control ECU controls the pressure holding valve and pressure reduction valve in order to adjust the fluid pressure of the each wheel cylinder in the following 3 modes: pressure reduction, pressure holding, and pressure increase modes.

Not Activated

Normal Braking

Activated

Increase Mode

Holding Mode

Reduction Mode

Hydraulic Circuit

Port A

Pressure Holding Valve ri

Port B

Pressure T .

Reduction Valve T° W Cylinder

Reservoir and Pump

From Wheel Cylinder

Pressure Holding Valve (Port A)

OFF (Open)

ON (Close)

Pressure Reduction Valve (Port B)

OFF (Close)

Wheel Cylinder Pressure

Increase

Hold

Reduction

169CH54

169CH55

169CH56

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