Apparatus, system, and method for aftertreatment control and diagnostics

• US 8,223,337 B2
• Filed: 11/02/2009
• Issued: 07/17/2012
• Est. Priority Date: 10/31/2008
• Status: Expired due to Fees

• Current Assignee: Cummins Incorporated
• Original Assignee: Cummins Incorporated
• Inventors: Janssen, John M., Lindner, Frederick H., Schneider, Matthew L.
• Primary Examiner(s): Punnoose, Roy M
• Application Number:
  US12/610,830
• Publication Number:
  US 20110170102A1
• Time in Patent Office: 988 Days
• Field of Search: 356/432, 356/438
• US Class Current: 356/438
• CPC Class Codes: G01M 15/108 using optical methods
• CPC Class Codes: G01N 2021/155 Monitoring cleanness of window, lens, or other parts
• CPC Class Codes: G01N 21/59 Transmissivity G01N21/25 takes precedence

Abstract

A method includes providing an exhaust stream for an internal combustion engine, where the exhaust stream is fluidly coupled to an aftertreatment component. The method includes optically determining an amount of an exhaust gas constituent in the exhaust stream. The method further includes modifying a model stored on a computer readable medium in response to the amount of the exhaust gas constituent. The model is an engine NO_x generation model, a catalyst NO_x storage model, a catalyst NO_x conversion model, a catalyst NO to NO₂ conversion model, a catalyst conversion efficiency model, an engine soot generation model, and/or a urea hydrolysis model.

Claims

1. A method comprising:

providing an exhaust stream for an internal combustion engine, the exhaust stream fluidly coupled to an aftertreatment component;

optically determining an amount of an exhaust gas constituent in the exhaust stream during the operation of the internal combustion engine; and

modifying a model stored on a computer readable medium in response to the amount of the exhaust gas constituent, wherein the modifying the model comprises at least one modifying action selected from the modifying actions consisting of calibrating a modeling parameter, resetting a modeling parameter, and resetting an integrator.

2. The method of claim 1, wherein the exhaust gas constituent comprises soot, and wherein the modifying the model comprises calibrating an engine soot generation model.

3. The method of claim 1, wherein the exhaust gas constituent comprises NO_x, and wherein the modifying the model comprises at least one modifying action selected from the modifying actions consisting of calibrating an engine NO_x generation model, modifying a catalyst NO_x storage model, modifying a catalyst NO_x conversion model, and modifying a catalyst NO to NO₂ conversion model.

4. The method of claim 1, wherein the exhaust gas constituent comprises urea, the method further comprising determining the exhaust gas constituent at a plurality of spatially divided portions of the exhaust stream, and wherein the modifying the model comprises modifying a urea hydrolysis model.

5. The method of claim 1, wherein the exhaust gas constituent comprises NO_x, and wherein the modifying the model comprises modifying a NO_x release model.

6. The method of claim 1, wherein the modifying the model comprises modifying a hydrocarbon slip model.

7. The method of claim 1, wherein the modifying the model comprises modifying an unburned hydrocarbons model.

8. The method of claim 1, wherein the exhaust gas constituent comprises ammonia, and wherein the modifying the model comprises modifying an ammonia slip model.

9. The method of claim 1, wherein the exhaust gas constituent comprises NO_x, and wherein the modifying the model comprises calibrating an engine NO_x generation model.

10. The method of claim 1, wherein the exhaust gas constituent comprises NO_x, and wherein the modifying the model comprises modifying a catalyst NO_x storage model.

11. The method of claim 1, wherein the exhaust gas constituent comprises NO_x, and wherein the modifying the model comprises modifying a catalyst NO_x conversion model.

12. The method of claim 1, wherein the exhaust gas constituent comprises NO_x, and wherein the modifying the model comprises modifying a catalyst NO to NO₂ conversion model.