Control strategies for a variable displacement oil pump
First Claim
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1. An internal combustion engine comprising:
- a fueling system comprising fuel injectors that utilize pumped hydraulic fluid to force fuel into engine combustion chambers;
a hydraulic system comprising an engine-driven multi-stage pump, whose effective displacement can be varied by selecting and de-selecting the stages, for pumping hydraulic fluid to the fuel injectors;
a control system for controlling the effective displacement of the pump to thereby control the flow of pumped fluid to the fuel injectors, wherein the flow of pumped fluid merges into a common fluid flow toward the fuel injectors; and
a further valve hydraulically connected to shunt the common fluid flow away from the fuel injectors.
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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.
15 Citations
36 Claims
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1. An internal combustion engine comprising:
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a fueling system comprising fuel injectors that utilize pumped hydraulic fluid to force fuel into engine combustion chambers; a hydraulic system comprising an engine-driven multi-stage pump, whose effective displacement can be varied by selecting and de-selecting the stages, for pumping hydraulic fluid to the fuel injectors; a control system for controlling the effective displacement of the pump to thereby control the flow of pumped fluid to the fuel injectors, wherein the flow of pumped fluid merges into a common fluid flow toward the fuel injectors; and a further valve hydraulically connected to shunt the common fluid flow away from the fuel injectors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An internal combustion engine comprising:
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a fueling system comprising fuel injectors that utilize pumped hydraulic fluid to force fuel Into engine combustion chambers; a hydraulic system comprising a multi-stage pump for pumping hydraulic fluid to the fuel injectors, wherein fluid flow from each of the stages is merged into a common fluid flow; a control system for selecting and de-selecting the pump stages for pumping fluid to the fuel injectors; at least one valve controlled by the control system that shunts pumped hydraulic fluid; and a further valve to shunt the common fluid flaw away torn the fuel injectors. - View Dependent Claims (16, 17, 18)
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19. A method for use in control of a fueling system of an internal combustion engine that has fuel injectors that utilize pumped hydraulic fluid to force fuel into engine combustion chambers and a hydraulic system comprising an engine-driven pump for pumping the hydraulic fluid to the fuel injectors, the method comprising the step of:
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varying the effective displacement of the pump to thereby control the flow of pumped fluid to the fuel injectors by selecting and de-selecting stages of the pump; merging the fluid flows from the stages of the pump into a common fluid flow toward the fluid injectors; and operating a further valve to shunt the common fluid flow away from the fuel injectors. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method for use in control of a fueling system of an internal combustion engine that has fuel injectors that utilize pumped hydraulic fluid to force fuel into engine combustion chambers and a hydraulic system comprising a multi-stage pump for pumping the hydraulic fluid to the fuel injectors, the method comprising:
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selecting and de-selecting the pump stages for pumping fluid to the fuel; merging pumped hydraulic fluid from the multi-stage pump into common fluid flow; and shunting the common fluid flow away from the fuel injectors. - View Dependent Claims (34, 35, 36)
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Specification