Sensing pump pressures and when one or both pressures become 200, 250 or 300K and higher, the merged lines are divided with modulation control. When the high pressure is lowered to 150 or 200K and less, the divided lines are merged again. Modulation control is done by the two EPC ( proportional ) solenoid valves to soften the switching shocks.
The switching of merging and dividing are repeated according to the operation pattern and pressure condition. There are four patterns for dividing and three ones to return to merging. Main and LS switching patterns are different.