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Research Papers: Internal Combustion Engines

The Effect of Engine Exhaust Temperature Modulations on the Performance of Automotive Catalytic Converters

[+] Author and Article Information
Tariq Shamim

Department of Mechanical Engineering, The University of Michigan–Dearborn, Dearborn, MI 48128-2406

J. Eng. Gas Turbines Power 130(1), 012801 (Dec 13, 2007) (9 pages) doi:10.1115/1.2747256 History: Received March 28, 2006; Revised January 16, 2007; Published December 13, 2007

This paper presents a computational investigation of the effect of exhaust temperature modulations on an automotive catalytic converter. The objective is to develop a better fundamental understanding of the converter’s performance under transient driving conditions. Such an understanding will be beneficial in devising improved emission control methodologies. The study employs a single-channel based, one-dimensional, nonadiabatic model. The transient conditions are imposed by varying the exhaust gas temperature sinusoidally. The results show that temperature modulations cause a significant departure in the catalyst behavior from its steady behavior, and modulations have both favorable and harmful effects on pollutant conversion. The operating conditions and the modulating gas composition and flow rates (space velocity) have substantial influence on catalyst behavior.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 9

Catalyst response to sinusoidal modulations in exhaust gas temperature under lean operating conditions for different space velocities (A∕F=17.5, mean exhaust temperature=600K, frequency=0.01Hz, amplitude=10%)

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Figure 10

Catalyst response to sinusoidal modulations in exhaust gas temperature under rich operating conditions for different space velocities (A∕F=12.5, mean exhaust temperature=600K, frequency=0.01Hz, amplitude=10%)

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Figure 11

Catalyst conversion efficiency for different space velocities in steady-state and transient (exhaust gas temperature modulation) conditions: near stoichiometric operating conditions (A∕F=14.7, mean exhaust temperature=600K, frequency=0.01Hz, amplitude=10%)

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Figure 1

Catalyst response to sinusoidal modulations in exhaust gas temperature near stoichiometric operating conditions (A∕F=14.7, mean exhaust temperature=600K, frequency=0.01Hz, amplitude=10%)

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Figure 2

Catalyst response to sinusoidal modulations in exhaust gas temperature under lean operating conditions (A∕F=17.5, mean exhaust temperature=600K, frequency=0.01Hz, amplitude=10%)

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Figure 3

Catalyst response to sinusoidal modulations in exhaust gas temperature under rich operating conditions (A∕F=12.5, mean exhaust temperature=600K, frequency=0.01Hz, amplitude=10%)

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Figure 4

Catalyst response to sinusoidal modulations in exhaust gas temperature: Effect of modulation amplitudes on conversion efficiencies. (a) Conversion efficiencies as a function of oscillation time period and (b) catalyst response amplitude as a function of the imposed modulation amplitude (A∕F=14.7, mean exhaust temperature=600K, frequency=0.01Hz)

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Figure 5

Catalyst response to sinusoidal modulations in exhaust gas temperature: Effect of modulation frequencies on conversion efficiencies. (a) Frequency range=0.01–1Hz, (b) frequency range=1–100Hz (A∕F=14.7, mean exhaust temperature=600K, amplitude=10%).

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Figure 6

Catalyst response to sinusoidal modulations in exhaust gas temperature: Effect of modulation frequencies on conversion response amplitudes (A∕F=14.7, mean exhaust temperature=600K, amplitude=10%)

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Figure 7

Catalyst response to sinusoidal modulations in exhaust gas temperature near stoichiometric operating conditions for different space velocities (A∕F=14.7, mean exhaust temperature=600K, frequency=0.01Hz, amplitude=10%)

Grahic Jump Location
Figure 8

Catalyst response to sinusoidal modulations in exhaust gas temperature for different space velocities (mean exhaust temperature=600K, frequency=0.01Hz, amplitude=10%)

Grahic Jump Location
Figure 12

Catalyst conversion efficiency for different space velocities in steady-state and transient (exhaust gas temperature modulation) conditions: under lean operating conditions (A∕F=17.5, mean exhaust temperature=600K, frequency=0.01Hz, amplitude=10%)

Grahic Jump Location
Figure 13

Catalyst conversion efficiency for different space velocities in steady-state and transient (exhaust gas temperature modulation) conditions: under rich operating conditions (A∕F=12.5, mean exhaust temperature=600K, frequency=0.01Hz, amplitude=10%)

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