IP Library › Granted Patent US 7,200,485
Granted Patent B2
US 7,200,485 · App. 11/254,480 · Granted Apr 3, 2007

Transient speed-and transient load-based compensation of fuel injection pressure

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Quick Facts
Patent No.
US 7,200,485
App. No.
11/254,480
Granted
Apr 3, 2007
Kind
B2
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.

Claims (28)

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.

2. An engine as set forth in claim 1 wherein the control system comprises a map containing data values for the transient component, each of which is correlated with engine speed and the rate at which the engine speed is changing, and the control system selects from the map a data value for the transient component that is correlated with a data value for present engine speed and a data value for present rate of change of engine speed.

3. An engine as set forth in claim 1 wherein the control system comprises a map containing data values for the transient component, each of which is correlated with engine speed and the rate at which the engine fueling is changing, and the control system selects from the map a data value for the transient component that is correlated with a data value for present engine speed and a data value for present rate of change of engine fueling.

4. An engine as set forth in claim 1 wherein the control system comprises two maps each of which contains respective data values for a sub-component of the transient component, and in one of which the data values for the sub-component are correlated with engine speed and the rate at which the engine speed is changing, and in the other of which the data values for the sub-component are correlated with engine speed and the rate at which the engine fueling is changing, and the control system selects from the one map a sub-component data value that is correlated with a data value for present engine speed and from the other map a sub-component data value that is correlated with a data value for present engine speed and a data value for present rate of change of engine fueling and algebraically sums the sub-component data values selected from the two maps to form the data value for the transient component.

5. An engine as set forth in claim 1 wherein the closed-loop strategy comprises, a proportional component and an integral component, each having a respective gain that is correlated with both engine speed and engine temperature.

6. An engine as set forth in claim 1 wherein control system's modification of the data value for desired steady state injection pressure based on steady state engine operation by the data value for the transient component comprises algebraically summing the data value for desired steady state injection pressure based on steady state engine operation and the data value for the transient component.

7. An engine as set forth in claim 6 wherein the control system also processes certain data to develop a data value for a feed-forward open-loop component and algebraically sums the last-mentioned data value with the data value for desired steady state injection pressure based on steady state engine operation and the data value for the transient component.

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:

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.

9. A control system as set forth in claim 8 comprising a map containing data values for the transient component, each of which is correlated with engine speed and the rate at which the engine speed is changing, and wherein the control system selects from the map a data value for the transient component that is correlated with a data value for present engine speed and a data value for present rate of change of engine speed.

10. A control system as set forth in claim 8 comprising a map containing data values for the transient component, each of which is correlated with engine speed and the rate at which the engine fueling is changing, and wherein the control system selects from the map a data value for the transient component that is correlated with a data value for present engine speed and a data value for present rate of change of engine fueling.

11. A control system as set forth in claim 8 comprising two maps each of which contains respective data values for a sub-component of the transient component, and in one of which the data values for the sub-component are correlated with engine speed and the rate at which the engine speed is changing, and in the other of which the data values for the sub-component are correlated with engine speed and the rate at which the engine fueling is changing, and wherein the control system selects from the one map a sub-component data value that is correlated with a data value for present engine speed and from the other map a sub-component data value that is correlated with a data value for present engine speed and a data value for present rate of change of engine fueling and algebraically sums the sub-component data values selected from the two maps to form the data value for the transient component.

12. A control system as set forth in claim 8 wherein the closed-loop strategy comprises a proportional component and an integral component, each having a respective gain that is correlated with both engine speed and engine temperature.

13. A control system as set forth in claim 8 wherein control system's modification of the data value for desired steady state injection pressure based on steady state engine operation by the data value for the transient component comprises algebraically summing the data value for desired steady state injection pressure based on steady state engine operation and the data value for the transient component.

14. A control system as set forth in claim 13 wherein the control system also processes certain data to develop a data value for a feed-forward open-loop component and algebraically sums the last-mentioned data value with the data value for desired steady state injection pressure based on steady state engine operation and the data value for the transient component.

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:

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.

16. A method as set forth in claim 15 comprising selecting from a map containing data values for the transient component, each of which is correlated with engine speed and the rate at which the engine speed is changing a data value for the transient component that is correlated with a data value for present engine speed and a data value for present rate of change of engine speed.

17. A method as set forth in claim 15 comprising selecting from a map containing data values for the transient component, each of which is correlated with engine speed and the rate at which the engine fueling is changing, a data value for the transient component that is correlated with a data value for present engine speed and a data value for present rate of change of engine fueling.

18. A method as set forth in claim 15 comprising selecting from each of two maps each of which contains respective data values for a sub-component of the transient component, one of which maps contains data values for the sub-component correlated with engine speed and the rate at which the engine speed is changing, and the other of which maps contains data values for the sub-component correlated with engine speed and the rate at which the engine fueling is changing, a respective sub-component data value that is correlated respectively with a data value for present engine speed and a sub-component data value that is correlated with a data value for present engine speed and a data value for present rate of change of engine fueling, and algebraically summing the selected sub-component data values to form the data value for the transient component.

19. A method as set forth in claim 15 wherein the step of modifying the data value for desired steady state injection pressure based on steady state engine operation by the data value for the transient component comprises algebraically summing the data value for desired steady state injection pressure based on steady state engine operation and the data value for the transient component.

20. A method as set forth in claim 19 further including the step of processing certain data to develop a data value for a feed-forward open-loop component and algebraically summing the last-mention data value with the data value for desired steady state injection pressure based on steady state engine operaton and the data value for the transient component.

Assignments (11)
RELEASE OF SECURITY INTEREST RECORDED AT REEL/FRAME 53545/443 Recorded Jul 15, 2021
From: THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.
To: NAVISTAR INTERNATIONAL CORPORATION; INTERNATIONAL TRUCK INTELLECTUAL PROPERTY COMPANY, LLC; INTERNATIONAL ENGINE INTELLECTUAL PROPERTY COMPANY, LLC; NAVISTAR, INC.
Reel/Frame 057441/0404 →
RELEASE OF SECURITY INTEREST Recorded Jul 2, 2021
From: JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT
To: INTERNATIONAL ENGINE INTELLECTUAL PROPERTY COMPANY, LLC; NAVISTAR, INC. (F/KA/ INTERNATIONAL TRUCK AND ENGINE CORPORATION); INTERNATIONAL TRUCK INTELLECTUAL PROPERTY COMPANY, LLC
Reel/Frame 056757/0136 →
CORRECTIVE ASSIGNMENT TO CORRECT THE CONVEYING PARTY DATA PREVIOUSLY RECORDED AT REEL: 052483 FRAME: 0742. ASSIGNOR(S) HEREBY CONFIRMS THE SECURITY INTEREST.. Recorded Apr 27, 2020
From: NAVISTAR INTERNATIONAL CORPORATION; INTERNATIONAL ENGINE INTELLECTUAL PROPERTY COMPANY, LLC; INTERNATIONAL TRUCK INTELLECTUAL PROPERTY COMPANY, LLC; NAVISTAR, INC. (F/K/A INTERNATIONAL TRUCK AND ENGINE CORPORATION)
To: JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT
Reel/Frame 053457/0001 →
SECURITY INTEREST Recorded Apr 27, 2020
From: NAVISTAR INTERNATIONAL CORPORATION; INTERNATIONAL ENGINE INTELLECTUAL PROPERTY COMPANY, LLC; INTERNATIONAL TRUCK INTELLECTUAL PROPERTY COMPANY, LLC; NAVISTAR, INC. (F/K/A INTERNATIONAL TRUCK AND ENGINE CORPORATION)
To: THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., AS COLLATERAL AGENT
Reel/Frame 053545/0443 →
SECURITY INTEREST Recorded Apr 23, 2020
From: INTERNATIONAL TRUCK INTELLECTUAL PROPERTY COMPANY, LLC; INTERNATIONAL ENGINE INTELLECTUAL PROPERTY COMPANY, LLC; NAVISTAR, INC. (F/K/A INTERNATIONAL TRUCK AND ENGINE CORPORATION)
To: JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT
Reel/Frame 052483/0742 →
RELEASE OF SECURITY INTEREST Recorded Nov 10, 2017
From: JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT
To: INTERNATIONAL ENGINE INTELLECTUAL PROPERTY COMPANY, LLC; INTERNATIONAL TRUCK INTELLECTUAL PROPERTY COMPANY, LLC; NAVISTAR, INC.; NAVISTAR INTERNATIONAL CORPORATION
Reel/Frame 044416/0867 →
SECURITY INTEREST Recorded Nov 10, 2017
From: NAVISTAR INTERNATIONAL CORPORATION; NAVISTAR, INC.
To: JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT
Reel/Frame 044418/0310 →
RELEASE OF SECURITY INTEREST Recorded Nov 10, 2017
From: JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT
To: NAVISTAR INTERNATIONAL CORPORATION; INTERNATIONAL TRUCK INTELLECTUAL PROPERTY COMPANY, LLC; INTERNATIONAL ENGINE INTELLECTUAL PROPERTY COMPANY, LLC
Reel/Frame 044780/0456 →
SECURITY AGREEMENT Recorded Sep 15, 2015
From: NAVISTAR INTERNATIONAL CORPORATION; INTERNATIONAL TRUCK INTELLECTUAL PROPERTY COMPANY, LLC; INTERNATIONAL ENGINE INTELLECTUAL PROPERTY COMPANY, LLC
To: JPMORGAN CHASE BANK N.A., AS COLLATERAL AGENT
Reel/Frame 036616/0243 →
SECURITY AGREEMENT Recorded Sep 12, 2012
From: INTERNATIONAL ENGINE INTELLECTUAL PROPERTY COMPANY, LLC; INTERNATIONAL TRUCK INTELLECTUAL PROPERTY COMPANY, LLC; NAVISTAR INTERNATIONAL CORPORATION; NAVISTAR, INC.
To: JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT
Reel/Frame 028944/0730 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 16, 2005
From: KENNEDY, MICHAEL P.
To: INTERNATIONAL ENGINE INTELLECTUAL PROPERTY COMPANY, LLC
Reel/Frame 017032/0447 →