RAPID ENGINE MAPPING AND MODELING

• US 20070265805A1
• Filed: 05/04/2007
• Published: 11/15/2007
• Est. Priority Date: 05/09/2006
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Lee, Byungho, Guezennec, Yann
• Granted Patent: US 7,941,260 B2
• Time in Patent Office: Days
• US Class Current: 702/187
• CPC Class Codes: G01M 15/05 by combined monitoring of two or more different engine parameters

Abstract

A method of mapping and modeling an engine during an engine development process includes testing the engine over a plurality of actual engine operating conditions and gathering actual engine data corresponding to the actual engine operating conditions. A plurality of parameter functions are determined based on the actual engine data, each of the plurality of parameter functions correspond to an engine operating parameter. A plurality of combustion parameters are generated for a plurality of engine operating conditions that include the plurality of actual engine operating conditions and a plurality of virtual engine operating conditions. An engine simulation model is calibrated based on the plurality of combustion parameters and a plurality of engine maps are generated using the simulation model.

Claims

1. A method of mapping and modeling an engine during an engine development process, comprising:

testing said engine over a plurality of actual engine operating conditions;

gathering actual engine data corresponding to said actual engine operating conditions;

determining a plurality of parameter functions based on said actual engine data, each of said plurality of parameter functions corresponding to an engine operating parameter;

providing an engine simulation model based on said plurality of actual engine operating conditions and said plurality of virtual engine operating conditions; and

generating a plurality of engine maps using said engine simulation model.

2. The method of claim 1, wherein said step of providing an engine simulation model includes:

generating a plurality of combustion parameters for a plurality of engine operating conditions that include said plurality of actual engine operating conditions and a plurality of virtual engine operating conditions, wherein said engine simulation model is based on said combustion parameters.

3. The method of claim 2, further comprising calibrating said engine simulation model based on said plurality of combustion parameters.

4. The method of claim 1 further comprising varying engine operating parameters over said engine operating conditions during said step of testing.

5. The method of claim 1 wherein said parameter functions are determined using a Wiebe function.

6. The method of claim 1 wherein said parameter functions include at least one of a spark timing, a burn duration, curve shaping factors, and a 50% burn location.

7. The method of claim 1 further comprising:

generating a mean-value engine model (MVEM) based on said plurality of engine maps; and

simulating an engine dynamic response during transient conditions using said MVEM.

8. The method of claim 1 wherein each of said parameter functions is based on at least one of engine operating conditions and actuator inputs.

9. The method of claim 8 wherein each of said parameter functions is based on at least one of an engine speed, an intake manifold pressure, an exhaust manifold pressure, an air per cylinder, an exhaust vale closure timing, an intake valve open timing, a spark timing, and a throttle position.

10. The method of claim 1 further comprising validating said engine simulation model at virtual engine operating points based on said actual engine data.

11. The method of claim 10 wherein said step of validating includes pre-processing of inputs to said engine simulation model and post-processing of outputs of said engine simulation model.

12. A method of mapping and modeling an engine during an engine development process, comprising:

testing said engine over a plurality of actual engine operating conditions;

gathering actual engine data corresponding to said actual engine operating conditions;

determining a plurality of parameter functions based on said actual engine data, each of said plurality of parameter functions corresponding to an engine operating parameter;

generating a plurality of combustion parameters for a plurality of engine operating conditions;

calibrating an engine simulation model based on said plurality of combustion parameters;

generating a plurality of engine maps using said engine simulation model;

generating a mean-value engine model (MVEM) based on said plurality of engine maps; and

simulating engine dynamic responses during transient conditions using said MVEM.

13. The method of claim 12, wherein said plurality of combustion parameters are determined based on said plurality of actual engine operating conditions and a plurality of virtual engine operating conditions.

14. The method of claim 12 further comprising varying engine operating parameters over said engine operating conditions during said step of testing.

15. The method of claim 12 wherein said parameter functions are determined using a Wiebe function.

16. The method of claim 12 wherein said parameter functions include at least one of a spark timing, a burn duration, curve shaping factors, and a 50% burn location.

17. The method of claim 12 wherein each of said parameter functions is based on at least one of engine operating conditions and actuator inputs.

18. The method of claim 17 wherein each of said parameter functions is based on at least one of an engine speed, an intake manifold pressure, an exhaust manifold pressure, an air per cylinder, an exhaust vale closure timing, an intake valve open timing, a spark timing, and a throttle position.

19. The method of claim 12 further comprising validating said engine simulation model at virtual engine operating points based on said actual engine data.

20. The method of claim 19 wherein said step of validating includes pre-processing of inputs to said engine simulation model and post-processing of outputs of said engine simulation model.