公开(公告)号：EP2578830B1

公开(公告)日：2018-01-03

申请号：EP11786507.1

申请日：2011-05-16

申请人： Isuzu Motors Limited

发明人： WAKAMATSU, Toshitsugu ,  KAWANAKA, Norio ,  KATAOKA, Hiroshi ,  KOMINE, Mamoru

IPC分类号： F01N3/08 ,  B01D53/94

CPC分类号： F01N3/18 ,  F01N3/208 ,  F01N11/002 ,  F01N13/009 ,  F01N2550/05 ,  F01N2610/02 ,  F01N2610/1493 ,  F01N2900/08 ,  F01N2900/1811 ,  Y02T10/24 ,  Y02T10/47

摘要： An SCR system that can suppress thermal damage such as a failure in operation of a dosing valve resulting from crystallization of urea solution and/or corrosion of the dosing valve to perform proper urea solution injection control is provided. The SCR system includes: an SCR (selective catalytic reduction) device 103 provided in an exhaust pipe 102 of an engine E; a dosing valve 104 that injects urea solution on an upstream side of the SCR device 103; a minimum injection quantity setting unit 128 that if a temperature of the dosing valve 104 is equal to or higher than a predetermined temperature, sets a minimum injection quantity according to the temperature of the dosing valve 104; and a urea solution injection control unit 127 that if an injected quantity of urea solution according to a quantity of NOx emitted from the engine E is smaller than the minimum injection quantity, controls the injected quantity of urea solution to be the minimum injection quantity.