APPARATUS, SYSTEM, AND METHOD FOR CALIBRATING AN INTERNAL COMBUSTION ENGINE

• US 20090299600A1
• Filed: 05/30/2008
• Published: 12/03/2009
• Est. Priority Date: 05/30/2008
• Status: Active Grant

• Current Assignee: Cummins Incorporated
• Original Assignee: Cummins Incorporated
• Inventors: Guo, Linsong, Brahma, Indranil
• Granted Patent: US 7,853,395 B2
• Time in Patent Office: Days
• US Class Current: 701/102
• CPC Class Codes: F02B 37/18 by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
• CPC Class Codes: F02B 37/22 by varying cross-section of exhaust passages or air passages , e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits F02B37/24 takes precedence
• CPC Class Codes: F02D 2041/1433 using a model or simulation of the system
• CPC Class Codes: F02D 41/1497 With detection of the mechanical response of the engine
• CPC Class Codes: F02D 41/2422 Selective use of one or more tables
• CPC Class Codes: F02D 41/2432 Methods of calibration

Abstract

According to one representative embodiment, an apparatus for calibrating an internal combustion engine having a predefined horsepower rating and categorized within an engine emissions family includes a calibration module, conditions module, and an output module. The calibration module includes a plurality of calibration tables that includes a top-rated torque curve and bottom-rated torque curve for each of a plurality of predetermined engine operating modes of the engine emissions family. The top-rated torque curve corresponds to a top horsepower rating of the engine emissions family and the bottom-rated torque curve corresponds to a bottom horsepower rating of the engine emissions family. The conditions module is configured to determine operating conditions of the internal combustion engine. The output module is configured to command at least one component of the engine to achieve a desired engine output exhaust gas emissions value based at least partially on the operating conditions of the internal combustion engine and a comparison between the predefined top horsepower rating and bottom horsepower rating of the engine emissions family.

Claims

1. An apparatus for calibrating an internal combustion engine having a predefined horsepower rating and categorized within an engine emissions family, comprising:

a calibration module comprising a plurality of calibration tables comprising a top-rated torque curve and bottom-rated torque curve for each of a plurality of predetermined engine operating modes of the engine emissions family, the top-rated torque curve corresponding to a top horsepower rating of the engine emissions family and the bottom-rated torque curve corresponding to a bottom horsepower rating of the engine emissions family;

a conditions module configured to determine operating conditions of the internal combustion engine; and

an output module configured to command at least one component of the engine to achieve a desired engine output exhaust gas emissions value based at least partially on the operating conditions of the internal combustion engine and a comparison between the predefined horsepower rating and the top and bottom horsepower ratings of the engine emissions family.

2. The apparatus of claim 1, wherein the engine operating modes each comprise a respective standard emissions testing mode.

3. The apparatus of claim 2, wherein each standard emissions testing mode comprises an upper operating point corresponding to the top horsepower rating of the engine emissions family and a lower operating point corresponding to the bottom horsepower rating of the engine emissions family.

4. The apparatus of claim 1, wherein the engine operating modes each comprise a key point corresponding to an engine operating time percentage above a predetermined threshold.

5. The apparatus of claim 1, wherein the at least one component comprises an engine component selected from the group consisting of fuel injectors, a variable geometry turbocharger, a fuel pressure regulating valve, and an exhaust gas recirculation valve.

6. The apparatus of claim 1, wherein for each predetermined engine operating mode, an engine exhaust gas emissions surface between the top horsepower rating and bottom horsepower rating inclusive is uniform.

7. The apparatus of claim 1, wherein:

each of the plurality of predetermined engine operating modes comprises an upper mode corresponding to the top horsepower rating of the engine emissions family and a lower mode corresponding to the bottom horsepower rating of the engine emissions family; and

the plurality of calibration tables comprise predetermined operating parameters for achieving a minimum brake specific fuel consumption at the upper and lower modes of each of the plurality of predetermined engine operating modes.

8. The apparatus of claim 1, wherein:

an engine exhaust gas emissions surface between the top horsepower rating and bottom horsepower rating of at least one of the plurality of predetermined engine operating modes is non-uniform; and

the calibration module is configured to determine a minimum brake specific fuel consumption at the upper and lower modes of each of the plurality of predetermined engine operating modes based at least partially on a fuel economy weighting factor.

9. The apparatus of claim 1, wherein:

the predefined horsepower rating is any of a plurality of intermediate horsepower ratings between the top horsepower rating and the bottom horsepower rating; and

the at least one component command is determined at least in part by using interpolation methods.

10. A method for calibrating an internal combustion engine, comprising:

determining an engine emissions family of the internal combustion engine;

determining key operating modes of the internal combustion engine from calibration tables corresponding to the determined engine emissions family, each key operating mode comprising an upper horsepower rating point and a lower horsepower rating point;

determining whether a uniform emissions surface is achievable between the upper and lower horsepower rating points of each key operating mode;

determining an engine horsepower rating of the internal combustion engine;

determining an optimal fuel economy for the determined horsepower rating at each of the determined key operating modes, the optimal fuel economy being based at least partially on the determined horsepower rating of the internal combustion engine; and

configuring the internal combustion engine according to the determined optimal fuel economy and a desired emissions surface at each of the determined key operating modes.

11. The method of claim 10, wherein:

if a uniform emissions surface is achievable between the upper and lower horsepower rating points of each key operating mode, the method further comprises determining an optimal fuel economy for the upper and lower horsepower ratings points of each key operating mode; and

the optimal fuel economy for the determined horsepower rating is based on the optimal fuel economy for the upper and lower horsepower ratings of each key operating mode.

12. The method of claim 11, wherein the optimal fuel economy for the determined horsepower rating at each of the determined key operating modes is dependent on a fuel injection strategy and the relative configurations of a variable geometry turbocharger device, a fuel pressure regulating valve, and an exhaust gas recirculation valve.

13. The method of claim 10, wherein:

if a uniform emissions surface is not achievable between the upper and lower horsepower rating points of each key operating mode, the method comprises determining whether a maximum difference between an exhaust gas emissions value at any one horsepower rating of the engine emissions family and an exhaust gas emissions value at any other horsepower rating of the engine emissions family is greater than an emissions variation threshold;

if the maximum difference is less than or equal to the emissions variation threshold, the optimal fuel economy for the determined horsepower rating at each of the determined key operating modes is determined using a first model;

if the maximum difference is greater than the emissions variation threshold, the optimal fuel economy for the determined horsepower rating at each of the determined key operating modes is determined using a second model different than the first model.

14. The method of claim 13, wherein the first model comprises

15. The method of claim 14, wherein the first model is constrained according to

16. The method of claim 13, wherein the second model comprises determining a minimum composite brake specific fuel consumption as a function of at least one of fuel injection timing and dosage, exhaust gas recirculation fraction, fuel rail pressure, and position of variable geometry turbo device for each operating point of interest within each key operating mode.

17. The method of claim 10, wherein the key operating modes comprise a plurality of predetermined emissions testing modes.

18. The method of claim 10, wherein the key operating modes each comprise an engine operating mode having an operating time percentage above a predetermined operating time percentage threshold.

19. An engine calibration module for calibrating an internal combustion engine, comprising:

at least one set of calibration tables comprising;

upper horsepower rating and lower horsepower rating information for each of a plurality of engine operating modes of a given engine emissions family;

exhaust gas emissions surface information corresponding to the upper horsepower rating and lower horsepower rating information for each of the plurality of engine operating modes of the given engine emissions family;

fuel economy optimization information corresponding to the upper horsepower rating and lower horsepower rating information for each of the plurality of engine operating modes of the given engine emissions family; and

engine component configuration information corresponding to the upper horsepower rating and lower horsepower rating information for each of the plurality of engine operating modes of the given engine emissions family, the engine component configuration information representing engine component configurations for achieving desired exhaust gas emissions surfaces represented by the exhaust gas emissions surface information and optimized fuel economy represented by the fuel economy optimization information;

wherein an internal combustion engine of the given engine emission family having any horsepower ratings between and including the upper and lower horsepower ratings is calibratable to achieve a desired exhaust gas emissions surface and an optimized fuel economy by accessing the at least one calibration table.

20. The engine calibration module of claim 19, wherein the engine component configurations each comprise at least one of a desired timing and dosing of a main fuel injection, a desired timing and dosing of at least one post-injection, a desired exhaust gas recirculation fraction, a desired fuel rail pressure, a desired variable geometry turbocharger device position, and a desired timing and dosing of a pilot fuel injection.

21. The engine calibration module of claim 19, wherein the fuel economy optimization information comprises a first set of fuel economy optimization information associated with uniform exhaust gas emissions surfaces for each of the plurality of engine operating modes and a second set of fuel economy optimization information associated with non-uniform exhaust gas emissions surfaces for at least one of the plurality of engine operating modes.