ABS with EBD Operation

Based on the signals received from the 4 wheel speed sensors and yaw rate & deceleration sensor, the skid control ECU calculates each wheel speed and deceleration, and checks wheel slipping condition. According to the slipping condition, the ECU controls the pressure holding solenoid valve and pressure reduction solenoid valve in order to adjust the fluid pressure of each wheel cylinder in the following three modes: pressure reduction, pressure holding, and pressure increase modes.

Not Activated

Normal Braking

Activated

Pressure Increase Mode

Pressure Holding Mode

Pressure Reduction Mode

Port A

Hydraulic Circuit

Port B

Port B

Pressure Reduction Solenoid Valve To Wheel Cylinder

Reservoir and Pump

From Wheel Cylinder

Pressure Holding Valve (Port A)

OFF/Open

ON/Close

ON/Close

Pressure Reduction Valve (Port B)

OFF/Close

OFF/Close

ON/Open

Pressure

Increase

Hold

Reduce

D13N69

D13N70

D13N71

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