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A Real Time NOx Model for Conventional and Partially Premixed Diesel Combustion
Lunds Tekniska Högskola, Värme- och kraftteknik.
2006 (English)In: SAE, Session: Compression Ignition Combustion Processes (Part 3 of 3), 2006Conference paper (Refereed)
Abstract [en]

In this paper a fast NOx model is presented which can be used for engine optimization, aftertreatment control or virtual mapping. A cylinder pressure trace is required as input data. High calculation speed is obtained by using table interpolation to calculate equilibrium temperatures and species concentrations. Test data from a single-cylinder engine and from a complete six-cylinder engine have been used for calibration and validation of the model. The model produces results of good agreement with emission measurements using approximately 50 combustion product zones and a calculation time of one second per engine cycle. Different compression ratios, EGR rates, injection timing, inlet pressures etc. were used in the validation tests. The model calculates thermal (high-temperature) NOx formation by the two reactions of the original Zeldovich mechanism but by using a simple empirical compensation algorithm, the model can also be used for low-temperature NOx formation associated with high EGR rates and long ignition delay.

Place, publisher, year, edition, pages
, SAE, 2006-01-0195
Keyword [en]
After-treatment, Calculation speed, Calculation time, Calibration and validations, Combustion products, Compensation algorithm, Cylinder pressures, Diesel combustion, Emission measurement, Engine optimization, Equilibrium temperatures, High temperature, Ignition delays, Injection timing, Inlet pressures, Input datas, Low temperatures, NOx formation, Premixed, Real time, Single-cylinder engines, Six-cylinder engines, Species concentration, Test data, Validation test
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-177593DOI: 10.4271/2006-01-0195ScopusID: 2-s2.0-79959813194OAI: diva2:873483
SAE 2006 World Congress & Exhibition, Detroit, MI, USA.

QC 20151124

Available from: 2015-11-24 Created: 2015-11-24 Last updated: 2015-11-24Bibliographically approved

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Hultqvist, Anders
Mechanical Engineering

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