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ABS ④ Functioning (Pressure Increment) Status
During the implementation of the pressure reduction, if the excessive brake liquid is drained or the
friction coefficient between the wheels and the road is increased, it’s necessary to increase the
pressure of various wheels. Under such case, the ECU will transmit the code for wheel pressure
increment to the HCU, namely turn on the normal open valve and turn off the normal close valve to
increase the pressure of wheel branch pump. During the implementation of the pressure reduction,
the brake liquid stored in the low pressure accumulator (LPA) will continue to rotate the motor to
drain the brake liquid under the pressure increment status. In such case, the brake liquid is supplied
to branch pump of various wheels via the general pump and normal open valve. 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) OFF Open
Normal Close Valve (NC Valve) OFF Close
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