EXHAUST PURIFICATION SYSTEM

An exhaust purification system effectively determines whether malfunction occurs in an NOx sensor when a sensor value of the NOx sensor suddenly increases. The exhaust purification system includes: an SCR (41) that purifies NOx in an exhaust gas using ammonia produced from urea water as a reducing a...

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Bibliographische Detailangaben
Hauptverfasser:	OOMURA Yasuhisa, AMAGASAKI Shin, MINEZAWA Masanobu
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BLASTING ENGINE PLANTS IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING STEAM ENGINES WEAPONS
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Beschreibung
Zusammenfassung:	An exhaust purification system effectively determines whether malfunction occurs in an NOx sensor when a sensor value of the NOx sensor suddenly increases. The exhaust purification system includes: an SCR (41) that purifies NOx in an exhaust gas using ammonia produced from urea water as a reducing agent; an NOx sensor (22) that acquires the value of the NOx contained in the exhaust gas; an actual-reach-time measurement unit (55) that measures a reach time until the NOx value acquired by the NOx sensor (22) reaches, from a first predetermined determinative NOx value,a second predetermined determinative NOx value, which is higher than the first determinative NOx value; and a sensor-value-increment determination unit (56) that determines that malfunction occurs in the NOx sensor (22) when the reach time measured by the actual-reach-time measurement unit (55) is equal to or shorter than a first predetermined determinative time.