Transient speed-and transient load-based compensation of fuel injection pressure
First Claim
1. An internal combustion engine comprising:
- a fueling system for forcing fuel under pressure into engine combustion chambers via fuel injectors;
an engine control system for controlling various aspects of engine operation including injection pressure at which fuel is injected into the engine combustion chambers by the fuel injectors;
wherein the control system comprises a steady state strategy for processing certain data to develop a data value for desired steady state injection pressure based on steady state engine operation and a transient strategy for developing transient data values to account for certain transients in engine operation by processing engine speed data and data representing rate of change in at least one of engine speed and engine fueling to develop a data value, for a transient component; and
wherein the control system modifies the data value for desired steady state injection pressure based on steady state engine operation by the data value for the transient component to develop a data value for a transient-modified desired injection pressure, compares the transient-modified desired injection pressure with a data value for actual injection pressure to develop a data value for an error signal, and processes the data value for the error signal through a closed-loop strategy to develop a data value for control of the injection pressure.
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Accused Products
Abstract
An engine (10) has a fueling system that uses hydraulic fluid to force fuel into engine combustion chambers via fuel injectors. Pressure of the hydraulic fluid is determined by a steady state strategy (ICP_DES—1) and a transient strategy (34, 36) that develops transient data values to account for certain transients in engine operation by processing engine speed data and data representing rate of change of engine speed, and data representing engine fueling to develop sub-strategy data values (ICP_FF_TS, ICP_FF_TL) for a transient component. The data values ICP_DES—1, ICP_FF_TS, and ICP_FF_TL are algebraically summed to develop a data value (ICP_DES—2) for a transient-modified desired hydraulic fluid pressure that is compared with a data value for actual hydraulic fluid pressure (ICP) to develop a data value for an error signal ICP_ERR. The data value for the error signal is processed according to a closed-loop strategy to develop a data value that controls the hydraulic fluid pressure.
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Citations
20 Claims
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1. An internal combustion engine comprising:
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a fueling system for forcing fuel under pressure into engine combustion chambers via fuel injectors; an engine control system for controlling various aspects of engine operation including injection pressure at which fuel is injected into the engine combustion chambers by the fuel injectors; wherein the control system comprises a steady state strategy for processing certain data to develop a data value for desired steady state injection pressure based on steady state engine operation and a transient strategy for developing transient data values to account for certain transients in engine operation by processing engine speed data and data representing rate of change in at least one of engine speed and engine fueling to develop a data value, for a transient component; and wherein the control system modifies the data value for desired steady state injection pressure based on steady state engine operation by the data value for the transient component to develop a data value for a transient-modified desired injection pressure, compares the transient-modified desired injection pressure with a data value for actual injection pressure to develop a data value for an error signal, and processes the data value for the error signal through a closed-loop strategy to develop a data value for control of the injection pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A control system for an internal combustion engine that has a fueling system that forces fuel into engine combustion chambers via fuel injectors under injection pressure and is controlled by the control system, the control system comprising:
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a steady state strategy for processing certain data to develop a data value for desired steady state injection pressure based on steady state engine operation and a transient strategy for developing transient data values to account for certain transients in engine operation by processing engine speed data and data representing rate of change in at least one of engine speed and engine fueling to develop a data value for a transient component; and wherein the control system modifies the data value for desired steady state injection pressure based on steady state engine operation by the data value for the transient component to develop a data value for a transient-modified desired injection pressure, compares the transient-modified desired injection pressure with a data value for actual injection pressure to develop a data value for an error signal, and processes the data value for the error signal through a closed-loop strategy to develop a data value for injection pressure. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for control of injection pressure at which fuel is injected into combustion chambers of an internal combustion engine via fuel injectors, the method comprising:
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processing data according to a steady state strategy to develop a data value for desired steady state injection pressure based on steady state engine operation and processing data according to a transient strategy to develop transient data values to account for certain transients in engine operation by processing engine speed data and data representing rate of change in at least one of engine speed and engine fueling to develop a data value for a transient component; and modifying the data value for desired steady state injection pressure based on steady state engine operation by the data value for the transient component to develop a data value for a transient-modified desired injection pressure, comparing the transient-modified desired injection pressure with a data value for actual injection pressure to develop a data value for an error signal, and processing the data value for the error signal according to a closed-loop strategy to develop a data value for pressure control, and using the data value for pressure control to control the injection pressure. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification