Automated model fit tool for SCR control and OBD development

E.A.C. Eijnden, van den, R.P.M. Cloudt, F.P.T. Willems, P. Heijden, van der

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

16 Citations (Scopus)
6 Downloads (Pure)


Reaching EUROVI Heavy Duty emission limits will resultin more testing time for developing control and OBDalgorithms than to reach EUROV emissions. It is likelythat these algorithms have to be adapted for a WHTC(World Heavy Duty Transient Cycle) for EUROVI. Thiscycle when started cold can only be performed a limitedtimes a day on the engine testbench, because of thecooling down time.The development time and cost increases to reachEUROVI emission levels.Accurate simulation tools can reduce the time and costsby reducing the amount of tests required on thetestbench. In order to use simulation tools to develop precalibrations, the models must be fitted and validated.This paper will focus on the fit process of an SCR(Selective Catalytic Reduction) model. A unique testprocedure has been developed to characterize an SCRcatalyst using an engine testbench in 2 days. This datais used in an automatic SCR fit tool to obtain the modelparameters in a few days. The result is a model thatpredicts the NO, NO2 and NH3 SCR out concentrationaccurately. The fitted SCR model can predict tailpipeNOx emissions for a wide range of test cycles within 10% (see Table 5). The validated model is used to developand calibrate SCR control and OBD algorithms.
Original languageEnglish
Title of host publicationDiesel Exhaust Emission Control Modeling, 2009 : SAE World Congress, 20-23 April 2009 Detroit, USA
Place of PublicationWarrendale, Pa
PublisherSociety of Automotive Engineers (SAE)
ISBN (Print)978-0-7680-2151-6
Publication statusPublished - 2009

Publication series

NameSAE International Journal of Engines
ISSN (Print)1946-3936


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