The 2004 Federal Tier II and California LEV I emission standards for diesel light trucks mandate tailpipe levels of . Active lean catalysts (ALNC or LNC) have been proposed as a means to achieve this standard. These catalysts require the delivery of supplemental hydrocarbons in order to reduce in the lean environment typical of diesel exhaust. In the system studied here, these additional hydrocarbons are injected into the exhaust system downstream of the turbocharger. A control-oriented, gray-box mathematical model is developed for diesel active lean catalysts. The model represents the phenomena relevant to reduction and HC consumption, namely, the catalyst chemical reactions, HC storage in the ALNC, and heat transfer behavior on the basis of an individual exhaust element. As an illustration of how the model may be used, dynamic programing is applied to determine the optimal trade-off of conversion efficiency versus quantity of injected hydrocarbons.
Control Oriented Modeling of a Diesel Active Lean NOx Catalyst Aftertreatment System
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Aswani, D. J., van Nieuwstadt, M. J., Cook, J. A., and Grizzle, J. W. (March 27, 2004). "Control Oriented Modeling of a Diesel Active Lean NOx Catalyst Aftertreatment System." ASME. J. Dyn. Sys., Meas., Control. March 2005; 127(1): 1–12. https://doi.org/10.1115/1.1870035
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