Approach for aftertreatment system modeling and model identification

• US 10,621,291 B2
• Filed: 02/09/2016
• Issued: 04/14/2020
• Est. Priority Date: 02/16/2015
• Status: Active Grant

• Current Assignee: Garrett Transportation I Inc. (Garrett Motion, Inc.)
• Original Assignee: Garrett Transportation I Inc. (Garrett Motion, Inc.)
• Inventors: Pekar, Jaroslav, Stewart, Gregory, Santin, Ondrej, Pachner, Daniel
• Primary Examiner(s): Lee, Brandon D
• Application Number:
  US15/019,029
• Publication Number:
  US 20160239593A1
• Time in Patent Office: 1,526 Days
• CPC Class Codes: F01N 11/00 Monitoring or diagnostic devices for exhaust-gas treatment apparatus , e.g. for catalytic activity safety, indicating or supervising devices for internal combustion engines F02B77/08; testing of machines G01M13/00
• CPC Class Codes: F01N 2260/24 for identifying exhaust parts or devices, e.g. by labels, stickers or directly printing
• CPC Class Codes: F01N 2550/03 of sorbing activity of adsorbents or absorbents
• CPC Class Codes: F02D 2041/1415 using a state feedback or a state space representation
• CPC Class Codes: F02D 2041/1433 using a model or simulation of the system
• CPC Class Codes: F02D 2041/1437 Simulation
• CPC Class Codes: F02D 2041/1469 with determination means using an estimation
• CPC Class Codes: F02D 2200/08 Exhaust gas treatment apparatus parameters
• CPC Class Codes: F02D 41/1445 the characteristics being related to the exhaust flow
• CPC Class Codes: F02D 41/1446 the characteristics being exhaust temperatures
• CPC Class Codes: F02D 41/1448 the characteristics being an exhaust gas pressure
• CPC Class Codes: F02D 41/1459 the characteristics being a hydrocarbon content or concentration
• CPC Class Codes: F02D 41/1461 of the exhaust gases emitted by the engine
• CPC Class Codes: F02D 41/2432 Methods of calibration
• CPC Class Codes: F02D 41/26 using computer, e.g. microprocessor
• CPC Class Codes: G01M 15/102 by monitoring exhaust gases
• CPC Class Codes: G01N 2033/0068 using a computer specifically programmed
• CPC Class Codes: G05B 17/00 Systems involving the use of models or simulators of said systems G05B13/00, G05B15/00, G05B19/00 take precedence
• CPC Class Codes: G06F 2119/08 Thermal analysis or thermal optimisation
• CPC Class Codes: G06F 30/20 Design optimisation, verification or simulation optimisation, verification or simulation of circuit designs G06F30/30
• CPC Class Codes: Y02T 10/40 : Engine management systems

Abstract

A system and approach for catalyst model parameter identification with modeling accomplished by an identification procedure that may incorporate a catalyst parameter identification procedure which may include determination of parameters for a catalyst device, specification of values for parameters and component level identification. Component level identification may be of a thermal model, adsorption and desorption, and chemistry. There may then be system level identification to get a final estimate of catalyst parameters.

Claims

1. An aftertreatment system comprising:

a catalyst device configured to treat an output from an engine exhaust; and

a controller including a catalyst model for the catalyst device, the controller configured to control operation of the catalyst device based on the catalyst model and the catalyst model comprises;

a thermal model component;

an adsorption and desorption component;

a chemical reaction component; and

a global component; and

wherein;

the thermal model component includes parameters representing heat transfer of the catalyst device, the heat transfer of the catalyst includes heat transfer from gas to monolith, heat transfer from monolith to housing, and heat transfer from housing to ambient;

the adsorption and desorption component includes parameters that incorporate a storage of chemical species for reaction; and

the chemical reaction component includes parameters that incorporate a reaction mechanism for chemical reactions.

2. The system of claim 1, wherein the controller is configured to:

obtain values of the parameters of the catalyst model from the vendor data; and

automatically estimate values of the parameters of the thermal model with on-engine data or flow bench data when reaction heat is suppressed.

3. The system of claim 2, wherein the controller is configured to:

estimate the parameters of the adsorption and desorption component independently when flow bench data are available; and

estimate the parameters adsorption and desorption component together with virtually all chemical reactions when flow bench data are not available.

4. The system of claim 3, wherein the chemical reaction component incorporates separable chemical reactions, wherein one reaction of the separable chemical reactions takes place at a time such that each chemical reaction can be isolated from other chemical reactions of the separable chemical reactions.

5. The system of claim 4, wherein the chemical reaction component can further incorporate one or more inseparable chemical reactions.

6. The system of claim 4, wherein:

steady state data can be used in a steady state catalyst model parameter identification;

the steady state catalyst model parameter identification based on steady state data is an estimate for a transient data catalyst model parameter identification based on transient data; and

transient data can be used in the transient data catalyst model parameter identification.