Determination of nitrogen oxide concentration in engine exhaust gas

A method of operating an internal combustion engine having a turbocharger for pressurizing an intake airflow and an after-treatment (AT) system including an AT device for reducing nitrogen oxides (NOX) concentration in the engine exhaust gas. The method includes operating the engine with a variable...

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Bibliographische Detailangaben
Hauptverfasser:	Castorina, Francesco, Sticchi, Giorgio, Dutto, Andrea
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION COMBUSTION ENGINES COMBUSTION ENGINES IN GENERAL CONTROLLING COMBUSTION ENGINES GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS INTERNAL-COMBUSTION PISTON ENGINES LIGHTING MECHANICAL ENGINEERING SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE WEAPONS
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Beschreibung
Zusammenfassung:	A method of operating an internal combustion engine having a turbocharger for pressurizing an intake airflow and an after-treatment (AT) system including an AT device for reducing nitrogen oxides (NOX) concentration in the engine exhaust gas. The method includes operating the engine with a variable high-pressure exhaust gas recirculation (EGR) and low-pressure EGR split in the intake airflow. The method also includes determining the NOX concentration in the exhaust gas and determining a current high-pressure EGR to low-pressure EGR split in the intake airflow. The method additionally includes determining an EGR corrective factor using the determined current high-pressure EGR to low-pressure EGR split and applying the determined EGR corrective factor to the determined NOX concentration to generate a corrected NOX concentration. Furthermore, the method includes regulating operation of the AT system to treat the exhaust gas via the AT device in response to the generated corrected NOX concentration.