Control strategies for a variable displacement oil pump

Internal-combustion engines – Charge forming device – Fuel injection system

Reexamination Certificate

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C123S447000, C123S514000

Reexamination Certificate

active

10217634

ABSTRACT:
An internal combustion engine (30) has a fueling system comprising fuel injectors (36) that utilize oil under pressure to force fuel into engine combustion chambers. Oil is pumped to an oil rail (44) by an engine-driven pump (42) whose effective displacement can be varied. A control system (32) processes certain data, such as engine speed and load, for controlling the effective displacement of the pump. The pump has a larger stage (42B) and a smaller stage (42A). The control system selects and de-selects the stages to control pump displacement.

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patent: 6095118 (2000-08-01), Klinger et al.
patent: 6668800 (2003-12-01), Ricco et al.
patent: 6672285 (2004-01-01), Smith et al.

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