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Reductant flow control for NO X removal from lean exhaust gases
Author(s) -
Krijnsen Henrike C.,
Van Kooten Wijnand E. J.,
Calis Hans Peter A.,
Bleek Cor M. Van Den
Publication year - 2001
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450790104
Subject(s) - feed forward , exhaust gas , feedback control , process engineering , control theory (sociology) , control (management) , computer science , control engineering , environmental science , automotive engineering , engineering , waste management , artificial intelligence
This review article describes and discusses the literature on reducing agent control systems for NO x emission reduction in the exhaust gas of full lean‐burn engines. The literature can be classified as feedback, feedforward, feedforward‐feedback, feedforward/feedforward‐feedback and periodical dosing control systems, which can be further classified as classical, override, co‐ordinated, constrained and split systems or a combination of those. As long as reproducible, fast and cheap NO x sensors are not commercially available, the control system should be an inferential feedforward or feedforward‐feedback system supplied with constraints for environmental and economical reasons. For future applications an oxidation catalyst downstream of the deNO x catalyst should be applied to convert any inevitable reductant slip, due to modelling errors, to harmless compounds.