Hybrid demand control for hydraulic pump

Details Hybrid demand control for hydraulic pump Hybrid demand control for hydraulic pump

2005-05-31

2005-05-31

Miller, Carl S. (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

C123S456000

Reexamination Certificate

active

06899083

ABSTRACT:
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. The partial filing control at high speed can in one embodiment include pre-metering the quantity of feed fuel delivered to each pumping chamber, for example by modulating the feed pressure at the pumping chamber inlet. Another embodiment includes passing the feed fuel from the inlet passage through a fixed, calibrated orifice sized to pass sufficient feed fuel to fill the pumping chambers 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 prevents the pumping chamber from filling in the charging phase, thereby monotonically decreasing the quantity of high pressure fuel delivered to the discharge passage in the discharge phase per engine revolution, with increasing speed above the transition speed.

REFERENCES:
patent: 4719889 (1988-01-01), Amann et al.
patent: 4884545 (1989-12-01), Mathis
patent: 5109822 (1992-05-01), Martin
patent: 5884606 (1999-03-01), Kellner et al.
patent: 6095118 (2000-08-01), Klinger et al.
patent: 6422203 (2002-07-01), Djordjevic

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