Using ion current signal for soot and in-cylinder variable measuring techniques in internal combustion engines and method for doing the same

Patent metadata

Field	Value
Publication number	US-9388759-B2
Application number	US-201214001668-A
Country	US
Kind code	B2
Filing date	Feb 28, 2012
Priority date	Feb 28, 2011
Publication date	Jul 12, 2016
Grant date	Jul 12, 2016

Abstract

A system and method is provided for the use of the ion current signal characteristics for onboard cycle-by-cycle, cylinder-by-cylinder measurement, for example soot measurement, load measurement such as indicated or brake mean effective pressure, or fuel consumption measurement in an internal combustion engine. The system may acquire an ion current signal, measures one or more of soot, load, fuel consumption and may control the engine operating parameters accordingly.

First claim

We claim:

1. A system for controlling an internal combustion engine, the system comprising an ion current sensor and a control unit in communication with the ion current sensor for receiving an ion current signal, the control unit being configured to predict at least one particulate emission level based on the ion current signal, wherein the control unit is configured to control engine operating parameters based on the sum of multiple functions of one or a combination of multiple ion current signal parameters, the ion current signal parameters including start of the ion current signal, a slope of the ion current signal, area under the curve of the ion current signal, ion current amplitude, and ion current delay.

2. The system according to claim 1 , wherein the at least one particulate emission level comprises a soot emission level and/or a black smoke emission level.

3. The system according to claim 1 , wherein the control unit is configured control engine operating parameters based on the predicted particulate emission levels from the ion signal.

4. The system of claim 1 , wherein the control unit is configured to control engine operating parameters based on a function of one or multiple ion current signal parameters according to the predicted particulate emission levels.

5. The system of claim 1 , wherein the control unit is configured to control engine operating parameters based on the sum of multiple functions of one or a combination of multiple ion current signal parameters, wherein each function is weighted prior to summing.

6. The system of claim 1 , wherein the control unit can control different engine parameters including at least one of fuel system parameters, air system parameters, ignition system parameters, turbo-charging and supercharging system parameters, valve train system parameters, EGR (exhaust gases recirculation) system parameters, and after-treatment system parameters based on a function of one or more or a combination of ion current signal parameters.

7. The system of claim 1 , wherein the ion current sensor is integrated with a glow plug, spark plug, engine gasket, fuel injector, or any electrically insulated probe.

8. The system of claim 1 , wherein the control unit determines a predicted soot measurement based on a function of one or more or a combination of ion current signal parameters and the control unit is configured to adjust the engine operating parameters if the predicted soot measurement is above a first threshold.

9. The system of claim 8 , wherein the control unit is configured to generate an error code and or alert if the predicted soot measurement is above a second threshold.

10. The system according to claim 1 , wherein the control unit is configured to control engine parameters according the predicted particulate emission based on one or more of the ion current signal.

11. A system for controlling an internal combustion engine, comprising: a ion current sensor configured to acquire an ion current signal in the internal combustion engine and a control unit configured to control engine operating parameters based on a function of one or more or a combination of ion current signal parameters, the control unit configured to control engine operating parameters based on the sum of multiple functions, the multiple functions including a function of at least one of a start of the ion current signal, a slope of the ion current signal, area under the curve of the ion current signal, ion current amplitude, and ion current delay.

12. The system of claim 11 , wherein the engine operating parameters are controlled based on a function of a combination of ion current signal parameters.

13. The system according to claim 11 , wherein the at least one particulate emission level are predicted based on ion current signal parameters comprising at least one of start of the ion current signal, a slope of the ion current signal, area under the curve of the ion current signal, ion current amplitude, or ion current delay.

14. The system according to claim 13 , wherein the control unit is configured to control engine parameters according the predicted at least one particulate emission level based on ion current signal parameters comprising at least one of start of the ion current signal, a slope of the ion current signal, area under the curve of the ion current signal, ion current amplitude, or ion current delay.

15. A system for controlling an internal combustion engine, the system comprising an ion current sensor and a control unit in communication with the ion current sensor for receiving an ion current signal, the control unit being configured to predict at least one engine load measurement based on one or more ion current signal parameters from a group of ion current signal parameters including start of the ion current signal, a slope of the ion current signal, area under the curve of the ion current signal, ion current amplitude, and ion current delay.

16. The system according to claim 15 , wherein the at least one engine load measurement is an engine load profile.

17. The system according to claim 16 , wherein the at least one engine load profile comprises an IMEP profile and/or a BMEP profile.

18. The system according to claim 16 , wherein the engine load profile are predicted based on ion current signal parameters comprising at least one of start of the ion current signal, a slope of the ion current signal, area under the curve of the ion current signal, ion current amplitude, or ion current delay.

19. The system according to claim 16 , wherein the control unit is configured to control engine parameters according the predicted engine load based on ion current signal parameters comprising at least one of start of the ion current signal, a slope of the ion current signal, area under the curve of the ion current signal, ion current amplitude, or ion current delay.

20. A system for controlling an internal combustion engine, the system comprising an ion current sensor and a control unit in communication with the ion current sensor for receiving an ion current signal, the control unit being configured to predict at least one fuel consumption measurement based on one or more ion current signal parameters from a group of ion current signal parameters including start of the ion current signal, a slope of the ion current signal, area under the curve of the ion current signal, ion current amplitude, and ion current delay.

21. The system according to claim 20 , wherein the at least one fuel consumption measurement is a fuel consumption profile.

22. The system according to claim 21 , wherein the control unit is configured to calculate an ISFC profile and/or a BSFC profile base on the fuel consumption profile and an IMEP profile and/or a BMEP profile.

23. The system according to claim 21 , wherein the at least one fuel consumption profile are predicted based on ion current signal parameters comprising at least one of start of the ion current signal, a slope of the ion current signal, area under the curve of the ion current signal, ion current amplitude, or ion current delay.

24. The system according to claim 21 , wherein the control unit is configured to control engine parameters according the predicted fuel consumption profile based on ion current signal parameters comprising at least one of start of the ion current signal, a slope of the ion current signal, area under the curve of the ion current signal, ion current amplitude, or ion current delay.

Assignees

• Estefanous Fadi A
• Badawy Tamer H
• Henein Naeim A
• Univ Wayne State

Inventors

• Estefanous Fadi A
• Badawy Tamer H
• Henein Naeim A

Classifications

• F02D35/023

  by determining the cylinder pressure · CPC title

• F02D41/1466

  the characteristics being a soot concentration or content · CPC title

• F02D41/30

  Controlling fuel injection {(F02D41/182, F02D41/24 take precedence)} · CPC title

• F02D35/021

  using an ionic current sensor · CPC title

• F02D41/1467 Primary

  with determination means using an estimation · CPC title