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Research Papers

Control-Oriented Modeling and Observer-Based Estimation of Solid and Gas Temperatures for a Diesel Engine Aftertreatment System

[+] Author and Article Information
Pingen Chen

 Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, OH 43210chen.2554@osu.edu

Junmin Wang1

 Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, OH 43210wang.1381@osu.edu

1

Corresponding author.

J. Dyn. Sys., Meas., Control 134(6), 061011 (Sep 13, 2012) (12 pages) doi:10.1115/1.4006632 History: Received October 07, 2011; Revised March 28, 2012; Published September 13, 2012; Online September 13, 2012

Diesel oxidation catalysts (DOCs) and diesel particulate filters (DPFs) have become standard components in diesel engine aftertreatment systems to remove carbon monoxide (CO), unburned hydrocarbon (HC), and particulate matter (PM) emissions. Many studies have been focused on improving the performances of DOCs and DPFs, which have been found to be influenced significantly by their respective thermal behaviors. The objective of this research is to develop a control-oriented thermal model for a DOC + DPF aftertreatment system. The control-oriented model is established by considering both thermal inertia of each component and chemical reactions inside it. Engine-out, DOC-out, and DPF-out emissions have been analyzed before simplified empirical models are proposed for the prediction of cared emission species. Experimental validation results show that the control-oriented models are capable of capturing both the gas phase and the solid phase thermal dynamics of a DOC and a DPF. An observer, designed based on the control-oriented solid temperature model and exhaust gas temperature model, can estimate the DOC and DPF gas and solid temperatures accurately in comparison with the measurements. The control-oriented thermal models and observer will be beneficial in the integrated engine and aftertreatment system control.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Diesel engine and aftertreatment system setup

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Figure 2

Schematic diagram of bench setup and instrument setup

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Figure 3

The Eley-Rideal mechanism

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Figure 4

Correlation between the engine-out CO concentration and fuel injection

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Figure 5

Correlation between the engine-out C3 H6 concentration and fuel injection

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Figure 6

Correlation between the engine-out CO2 concentration and fuel injection

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Figure 7

Correlation between the DOC-out CO concentration and engine-out CO2 concentration

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Figure 8

Correlation between the DOC-out C3 H6 concentration and the engine-out CO2 concentration

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Figure 9

Correlation between the engine-out O2 concentration and the DOC-out NO concentration

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Figure 10

Correlation between the engine-out O2 concentration and the DPF-out NO concentration

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Figure 11

Typical values of K1 , K3 , and K4 over the entire engine operating range

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Figure 12

Engine speed and torque profiles (part I)

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Figure 13

Engine speed and torque profiles (part II)

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Figure 14

Measured exhaust temperatures at the engine outlet, DOC outlet, and DPF outlet

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Figure 15

Validation of gas temperature at the DOC outlet

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Figure 16

DOC solid temperature and gas temperature at the DOC outlet

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Figure 17

Validation of gas temperature at the DPF outlet

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Figure 18

DPF solid temperature and gas temperature at the DPF outlet

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Figure 19

DOC gas temperature estimation

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Figure 20

DOC solid temperature estimation

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Figure 21

DPF gas temperature estimation

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Figure 22

DPF solid temperature estimation

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