SCR SYSTEM

Provided is an SCR system that enables reduction in burden on a battery resulting from energization of a heater and a decrease in time during which an NOx concentration cannot be detected. The SCR system includes: an SCR device 103; a dosing valve 104; NOx sensors 110 and 111; an urea solution injec...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	HARADA SHINICHI, MINEZAWA MASANOBU, OOMURA YASUHISA
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 INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES LIGHTING MACHINES OR ENGINES IN GENERAL MEASURING MECHANICAL ENGINEERING PHYSICS STEAM ENGINES TESTING WEAPONS
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Beschreibung
Zusammenfassung:	Provided is an SCR system that enables reduction in burden on a battery resulting from energization of a heater and a decrease in time during which an NOx concentration cannot be detected. The SCR system includes: an SCR device 103; a dosing valve 104; NOx sensors 110 and 111; an urea solution injection control unit 1; electric heaters 2 and 3 for raising respective temperatures of the NOx sensors 110 and 111 to a sensor operating temperature; and an energization permission unit 4 that prohibits energization of the heaters 2 and 3 at the time of an start of an engine and permits energization of the heaters 2 and 3 when an engine revolutions becomes equal to or exceeds a preset energization permission threshold value v1 and such state lasts for a period of time equal to or exceeding a preset stabilization wait time t1.