SYSTEM AND METHOD FOR DETECTING TAILPIPE AMMONIA SLIP

System and method of treating exhaust gas from an internal combustion engine using selective catalytic reduction and a modulated supply of diesel exhaust fluid. The modulated supply of diesel exhaust fluid induces variations in nitrogen oxides exiting a selective catalytic reduction chamber. An elec...

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Bibliographische Detailangaben
Hauptverfasser:	PIPHO, Michael, DUESSELDORF, Christian, TUKEN, Taner
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BLASTING CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION ENGINE PLANTS IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING STEAM ENGINES 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:	System and method of treating exhaust gas from an internal combustion engine using selective catalytic reduction and a modulated supply of diesel exhaust fluid. The modulated supply of diesel exhaust fluid induces variations in nitrogen oxides exiting a selective catalytic reduction chamber. An electronic control unit inputs a signal from a sensor that senses the variations in nitrogen oxides. The signal is filtered at the modulation frequency to isolate peak-to-peak variations in the signal caused by the modulated diesel exhaust fluid supply. Based on whether the peak-to-peak variations are above a threshold thus indicating a predominance of nitrogen oxides over reductant, the electronic control unit adjusts the supply of diesel exhaust fluid.