HYBRID DEMAND CONTROL FOR HYDRAULIC PUMP

摘要

The invention is directed to the combination of fuel rail pressure control at lower speed using high pressure regulation plus fuel rail pressure control at higher speed using any of a variety of forms of inlet metering. An embodiment includes passing the feed fuel from the inlet passage (13) through a fixed, calibrated orifice (17) sized to pass sufficient feed fuel to fill the pumping chambers (16) in the charging phase during operation of the engine in the low speed range, while in the high speed range the flow resistance of the orifice (17) prevents the pumping chamber (16) from filling in the charging phase.