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)

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.

• Language: English
• Keywords: two zone modeling framework, 0-d modeling, NOx formation, diesel engines, chemical kinetics
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2018
• Number of pages: f. 1-17
• Numbering: Vol. 73
• PID: 20.500.12556/RUL-106211
• UDC: 621.4:544.4:004.9(045)
• ISSN on article: 1953-8189
• DOI: 10.2516/ogst/2018005
• COBISS.SI-ID: 16019995
• Publication date in RUL: 12.02.2019

Record is a part of a journal

• Title: Oil & gas science and technology
• Shortened title: Oil gas sci. technol.
• Publisher: Institut français du pétrole
• ISSN: 1953-8189
• COBISS.SI-ID: 12853019

Secondary language

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

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0401, MR:35395; EVA4green
• Name: Energetsko strojništvo