Real time capable virtual NOx sensor for diesel engines based on a two-zone thermodynamic model
Vihar, Rok (Author), Žvar Baškovič, Urban (Author), Katrašnik, Tomaž (Author)

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This paper presents a control-oriented thermodynamic model capable of predicting nitrogen oxides (NOx) emissions in diesel engines. It is derived from zero-dimensional combustion model using in-cylinder pressure as the input. The methodology is based on a two-zone thermodynamic model which divides the combustion chamber into a burned and unburned gas zone. The original contribution of proposed method arises from: (1) application of a detailed two-zone modeling framework, developed in a way that the thermodynamic equations could be solved in a closed form without iterative procedure, which provides the basis for achieving high level of predictiveness, on the level of real-time capable models and (2) introduction of relative air-fuel ratio during combustion as a main and physically motivated calibration parameter of the NOx model. The model was calibrated and validated using data sets recorded in two different direct injection diesel engines, i.e. a light and a heavy-duty engine. The model is suitable for real-time applications since it takes less than a cycle to complete the entire closed cycle thermodynamic calculation including NOx prediction, which opens the possibility of integration in the engine control unit for closed-loop or feed-forward control.

Keywords:two zone modeling framework, 0-d modeling, NOx formation, diesel engines, chemical kinetics
Work type:Article (dk_c)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Number of pages:f. 1-17
Numbering:Vol. 73
ISSN on article:1953-8189
DOI:10.2516/ogst/2018005 Link is opened in a new window
COBISS.SI-ID:16019995 Link is opened in a new window
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Record is a part of a journal

Title:Oil & gas science and technology
Shortened title:Oil gas sci. technol.
Publisher:Institut français du pétrole
COBISS.SI-ID:12853019 This link opens in a new window

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P2-0401, MR:35395; EVA4green
Name:Energetsko strojništvo

Secondary language

Keywords:dvoconski termodinamski model, 0D modeliranj, tvorba NOx, dizelski motorji, kemijska kinetika

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