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TECHNICAL PAPERS: Emissions

Dynamic Response of Automotive Catalytic Converters to Variations in Air-Fuel Ratio

[+] Author and Article Information
T. Shamim, V. C. Medisetty

Department of Mechanical Engineering, The University of Michigan, Dearborn, MI 48128-1491

J. Eng. Gas Turbines Power 125(2), 547-554 (Apr 29, 2003) (8 pages) doi:10.1115/1.1564065 History: Received November 01, 2001; Revised July 01, 2002; Online April 29, 2003
Copyright © 2003 by ASME
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References

Figures

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Catalyst response to sinusoidal modulations in A/F near stoichiometric operating conditions (mean A/F=14.8, frequency=1 Hz, amplitude=5%)
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Catalyst conversion efficiencies corresponding to A/F of 14.8 (when reached from rich side) during sinusoidal modulations in A/F (mean A/F=14.8, frequency=1 Hz, amplitude=5%)
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Catalyst response to sinusoidal modulations in A/F near rich operating conditions (mean A/F=12.5, frequency=1 Hz, amplitude=5%)
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Catalyst response to sinusoidal modulations in A/F without oxygen storage capacity (mean A/F=14.8, frequency=1 Hz, amplitude=5%)
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Catalyst response to sinusoidal modulations in A/F: effect of oscillation frequencies (a) CO conversion efficiency; (b) HC conversion efficiency; (c) NO conversion efficiency (mean A/F=14.8, amplitude=5%)
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Catalyst CO response to sinusoidal modulations in A/F for different oscillation frequencies (mean A/F=14.8, amplitude=5%)
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Catalyst response to sinusoidal modulations in A/F: effect of oscillation amplitudes (mean A/F=14.8, frequency=1 Hz)
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Catalyst response to step change in A/F: from lean to rich zone (A/F=15 to 14)
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Catalyst response to step change in A/F: from rich to lean zone (A/F=14 to 15)
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Catalyst response to double-step change in A/F: lean excursion for 1 second (A/F=14 to 15 to 14)

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