ENGINE CONTROL METHOD BASED ON GRAPHIC SIGNATURES

• US 20100217498A1
• Filed: 10/24/2008
• Published: 08/26/2010
• Est. Priority Date: 10/30/2007
• Status: Abandoned Application

• Current Assignee: IFP Energies Nouvelles
• Original Assignee: IFP Energies Nouvelles
• Inventors: Youssef, Bilal, Corde, Gilles
• Application Number:
  US12/680,745
• Publication Number:
  US 20100217498A1
• Time in Patent Office: Days
• US Class Current: 701/101
• CPC Class Codes: F02D 2250/04 Fuel pressure pulsation in common rails
• CPC Class Codes: F02D 2250/18 Control of the engine output torque
• CPC Class Codes: F02D 41/22 Safety or indicating devices for abnormal conditions in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809
• CPC Class Codes: F02D 41/403 with pilot injections
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A method of extracting useful information for control of an internal-combustion engine, based on graphic signatures is disclosed. A signal carrying at least information relative to engine operation is acquired. This signal is then converted, for each engine cycle, to a graphic signature translating a set of characteristic features of the signal in a form of a graph which is simple to analyze. At least one attribute of this signature is then determined, from which the pertinent information is estimated by a predetermined relation between the attribute and the information. Finally, the information is used to control the engine

Claims

1-12. -12. (canceled)

13. A method for controlling an internal-combustion engine including at least one detector, from which at least one signal is acquired containing at least information relative to operation of the engine including a set of discrete measurements, comprising:

selecting a function for converting the at least one signal into a graphic signature, by projection of signal measurements contained in a moving time window, from a multidimensional space to a space of fewer dimensions than the multidimensioned space; and

for each cycle of the engine converting the signal into the graphic signature with the function extracting the information from the signature and using the information to control the engine.

15. A method as claimed in claim 13, wherein the fewer dimensions than the multidimensions has two dimensions.

16. A method as claimed in claim 13, wherein the graphic signature is obtained at any time t by steps comprising:

constructing a vector including a measurement at time t and of measurements preceding time t; and

converting the vector into a pair of coordinates representing a point in a two dimension plane.

18. A method as claimed in claim 15, wherein the graphic signature is obtained at any time t by steps comprising:

constructing a vector including a measurement at time t and of measurements preceding time t; and

converting the vector into a pair of coordinates representing a point in a two dimension plane.

20. A method as claimed in claim 15, wherein the relation between the attribute and the information is determined by steps on an engine test bench comprising:

constructing a graphic signature for different information values;

calculating the attribute for each signature; and

determining the relation by comparing the attribute and information pairs for each signature.

21. A method as claimed in claim 16, wherein the relation between the attribute and the information is determined by steps on an engine test bench comprising:

constructing a graphic signature for different information values;

calculating the attribute for each signature; and

determining the relation by comparing the attribute and information pairs for each signature.

23. A method as claimed in claim 18, wherein the relation between the attribute and the information is determined by steps on an engine test bench comprising:

constructing a graphic signature for different information values;

calculating the attribute for each signature; and

determining the relation by comparing the attribute and information pairs for each signature.

24. A method as claimed in claim 13, wherein the signal is a pressure measurement from a common rail of the engine.

26. A method as claimed in claim 15, wherein the signal is a pressure measurement from a common rail of the engine.

27. A method as claimed in claim 16, wherein the signal is a pressure measurement from a common rail of the engine.

29. A method as claimed in claim 24, wherein the information corresponds to detection of an injection.

30. A method as claimed in claim 29 wherein the attribute is a surface area of the signature.

31. A method as claimed in claim 30, wherein the injection is detected by comparing surface area of the signature with a predetermined threshold.

32. A method as claimed in claim 13, wherein the signal is an instantaneous engine speed measurement.

34. A method as claimed in claim 15, wherein the signal is an instantaneous engine speed measurement.

35. A method as claimed in claim 16, wherein the signal is an instantaneous engine speed measurement.

37. A method as claimed in claim 32, wherein the information is engine torque.

38. A method as claimed in claim 32, wherein the attribute depends on a horizontal diameter and a vertical diameter of the graphic signature.

39. A method as claimed in claim 37, wherein the attribute depends on a horizontal diameter and a vertical diameter of the graphic signature.