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ABS ② Functioning (Pressure Reduction) Status
For the vehicles equipped with ABS, if the applied braking pressure is too big, the wheels will
have rapider deceleration than that of vehicle body, which will be ready to result the lock of the
wheels. Under such case, the ECU will transmit the code for wheel pressure reduction to the HCU,
namely turn off the normal open valve and turn on the normal close valve to reduce the pressure of
wheel branch pump. In such case, the brake oil released by the wheel branch pump is temporarily
stored in the low pressure accumulator (LPA). The brake oil stored in the LPA will be sucked
back to the general pump by the oil pump started following the rotation of the motor. The brake
liquid will return to the high pressure accumulator (HPA) in the pipeline and reduce the high
pressure pulse generated by the running of the oil pump by means of the orifice hydraulic
resistance.
Solenoid Valve
Power Status
Solenoid Valve Status
Normal Open Valve (NO Valve) ON Close
Normal Close Valve (NC Valve) ON Open
ABS ③ Functioning (Maintaining) Status
When the branch pumps of the wheels are applied with proper pressure via the pressure reduction
or pressure increment, the normal open valve and the normal close valve will be turned off to
maintain the pressure of the wheel branch pumps. For the operations mentioned in above ~ ②④,
depending on that wheels are locked or not, the ABS will function till the vehicle is fully stopped
and therefore the safety and steering capability of the vehicle are guaranteed.
Solenoid Valve Power Status Solenoid Valve Status
Normal Open Valve (NO Valve) ON Close
Normal Close Valve (NC Valve) OFF Close
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