Hyundai Elantra MD/UD: Electronic Oil Pump (EOP). Description and Operation
Description
ISG system has a standard Mechanical Oil Pump(MOP) linked to the input
shaft to generates oil pressure when input shaft rotates. ISG system also has
an Electric Oil Pump(EOP). Because the ISG features Auto-Stop which starts and
stops the engine as needed. The Auto-Stop feature prevents the Mechanical Oil
Pump(MOP) from operating and building enough pressure for the transaxle to operate.
When the vehicle comes to a stop with the engine off, Mechanical Oil Pump(MOP)
cannot generate sufficient oilpressure during the initial startup (below 5 KPH)
or during low speed driving.
For these reasons, the Electric Oil Pump(EOP) takes on this role as an
additional device that can generate the required oil pressure when the vehicle
comes to a stop or during low speed driving.The Electric Oil Pump(EOP) supplies
oil pressure to the Under Drive Brake(UD/B).
