Real-time capable virtual NOx sensor for diesel engines based on a two-Zone thermodynamic model
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 t...
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2018-01-01
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Online Access: | https://doi.org/10.2516/ogst/2018005 |
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doaj-d9c77b0761934701859ed65a4e683ac82021-02-02T06:02:02ZengEDP SciencesOil & Gas Science and Technology1294-44751953-81892018-01-01731110.2516/ogst/2018005ogst170111Real-time capable virtual NOx sensor for diesel engines based on a two-Zone thermodynamic modelVihar RokBaškovič Urban ŽvarKatrašnik TomažThis 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.https://doi.org/10.2516/ogst/2018005 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Vihar Rok Baškovič Urban Žvar Katrašnik Tomaž |
spellingShingle |
Vihar Rok Baškovič Urban Žvar Katrašnik Tomaž Real-time capable virtual NOx sensor for diesel engines based on a two-Zone thermodynamic model Oil & Gas Science and Technology |
author_facet |
Vihar Rok Baškovič Urban Žvar Katrašnik Tomaž |
author_sort |
Vihar Rok |
title |
Real-time capable virtual NOx sensor for diesel engines based on a two-Zone thermodynamic model |
title_short |
Real-time capable virtual NOx sensor for diesel engines based on a two-Zone thermodynamic model |
title_full |
Real-time capable virtual NOx sensor for diesel engines based on a two-Zone thermodynamic model |
title_fullStr |
Real-time capable virtual NOx sensor for diesel engines based on a two-Zone thermodynamic model |
title_full_unstemmed |
Real-time capable virtual NOx sensor for diesel engines based on a two-Zone thermodynamic model |
title_sort |
real-time capable virtual nox sensor for diesel engines based on a two-zone thermodynamic model |
publisher |
EDP Sciences |
series |
Oil & Gas Science and Technology |
issn |
1294-4475 1953-8189 |
publishDate |
2018-01-01 |
description |
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. |
url |
https://doi.org/10.2516/ogst/2018005 |
work_keys_str_mv |
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1724302169488752640 |