公开(公告)号：EP1491736A4

公开(公告)日：2008-12-03

申请号：EP03745439

申请日：2003-03-28

申请人： ISUZU MOTORS LTD

发明人： NAKATSUJI T ,  YOKOYAMA J ,  NAKADA T ,  UEKUSA T ,  UEMATSU Y ,  FUJITA T ,  TANAKA YOUSUKE ,  ENOKI K ,  SHIBUYA H

IPC分类号： F01N3/20 ,  F02D45/00 ,  B01D53/86 ,  B01D53/94 ,  F01N3/08 ,  F01N3/24 ,  F01N9/00 ,  F01N11/00 ,  F02D41/04

CPC分类号： F02D41/028 ,  F01N3/0885 ,  F01N3/20 ,  F01N9/00 ,  F01N11/00 ,  F01N2260/04 ,  F01N2560/026 ,  F01N2570/04 ,  F01N2570/14 ,  F02D41/1446 ,  F02D41/1463 ,  F02D2200/0818 ,  Y02A50/2344 ,  Y02T10/20 ,  Y02T10/47

摘要： Nitrogen oxide purification system has a direct reduced-type nitrogen oxide catalyst arranged in an exhaust-gas passage so a catalyst component reduces nitrogen oxide to nitrogen when the oxygen concentration in engine exhaust gas is high. The catalyst component is oxidized during the process, and is reduced when the oxygen concentration in the exhaust gas reduces. NOx purification system has a direct reduced-type NOx catalyst arranged in an exhaust-gas passage so a catalyst component reduces NOx to nitrogen when the oxygen concentration in engine exhaust gas is high. The catalyst component is oxidized during the process, and is reduced when the oxygen concentration in the exhaust gas reduces. The NOx purification system has a first sulfur purge control means which performs a first sulfur purging operation by lowering the oxygen concentration in exhaust gas and raising the exhaust-temperature to a temperature above the sulfur purge temperature, when the exhaust-temperature becomes larger than a predetermined fixed temperature during usual operation. An independent claim is also included for a catalyst degradation recovery method in a NOx purification system which contains a first sulfur purging operation control which performs first sulfur purging operation where an oxygen concentration in an exhaust gas is made low when a predetermined exhaust-temperature becomes larger than a predetermined fixed temperature during normal operation, and the exhaust-temperature is raised to a temperature above the sulfur purge temperature.

公开(公告)号：EP1491735A4

公开(公告)日：2006-10-11

申请号：EP03745438

申请日：2003-03-28

申请人： ISUZU MOTORS LTD

发明人： UEKUSA T ,  NAKATA T ,  ENOKI K ,  UEMATSU Y ,  FUJITA T ,  TANAKA Y ,  YOKOYAMA J ,  SHIBUYA H

IPC分类号： F02D43/00 ,  B01D53/94 ,  F01N3/02 ,  F01N3/022 ,  F01N3/023 ,  F01N3/035 ,  F01N3/08 ,  F01N3/20 ,  F01N3/22 ,  F01N3/24 ,  F01N3/28 ,  F01N3/30 ,  F01N11/00 ,  F01N13/02 ,  F02B29/04 ,  F02B37/00 ,  F02B37/16 ,  F02D41/04 ,  F02D45/00 ,  F02M25/07

CPC分类号： F02B37/164 ,  F01N3/023 ,  F01N3/035 ,  F01N3/0821 ,  F01N3/0885 ,  F01N3/20 ,  F01N3/22 ,  F01N3/30 ,  F01N11/00 ,  F01N13/0097 ,  F01N2260/04 ,  F01N2570/14 ,  F02B29/0406 ,  F02B37/00 ,  F02B37/168 ,  F02M26/05 ,  F02M26/10 ,  F02M26/28 ,  Y02A50/2344 ,  Y02T10/144

摘要： Exhaust gas purification system has a direct-reduction nitrogen oxide catalyst for purifying nitrogen oxides in exhaust gas and a catalyst-attached diesel particulate filter (DPF) for purifying particulate matter (PM) in exhaust gas, arranged upstream to the exhaust gas flow path. Exhaust gas purification system has a direct-reduction nitrogen oxide catalyst for purifying nitrogen oxides in exhaust gas and a catalyst-attached diesel particulate filter (DPF) for purifying particulate matter (PM) in exhaust gas, arranged upstream to the exhaust gas flow path. The oxygen concentration in the exhaust gas is made almost zero and the exhaust gas temperature is raised. An air supply system is provided for supplying air between the NOx catalyst and the DPF, during deactivated catalyst reactivation treatment due to sulfur poisoning of the NOx catalyst. An independent claim is also included for the control of a NOx purification system by supplying air between the NOx catalyst and the DPF.