Title:
排気浄化装置
Document Type and Number:
Japanese Patent JP4290032
Kind Code:
B2
Abstract:
An NOx reducing catalyst for reducing/purifying NOx using a reducing agent is installed on an engine exhaust pipe, and solenoid on/off valves for opening/closing an exhaust flow path and oxidizing catalysts mutually different in oxidizing capability for oxidizing NO to NO2 are respectively installed on respective branch pipes obtained by branching into two an exhaust pipe positioned on the exhaust upstream side thereof. The respective oxidizing catalysts use a low-temperature oxidizing catalyst exhibiting a good oxidizing capability when an exhaust temperature is low and a high-temperature oxidizing catalyst exhibiting a good oxidizing capability when an exhaust temperature is high. A control unit respectively controls solenoid on/off valves based on an engine rotating speed Ne and a load Q so that a ratio between NO and NO2 in the exhaust introduced into the NOx reducing catalyst approaches a specified ratio.
Inventors:
Konobu Hirata
Nobuhiko Masaki
Akakawa Hisashi
Nobuhiko Masaki
Akakawa Hisashi
Application Number:
JP2004041865A
Publication Date:
July 01, 2009
Filing Date:
February 18, 2004
Export Citation:
Assignee:
Nissan Diesel Industry Co., Ltd.
International Classes:
F01N3/20; B01D53/94; F01N3/08; F01N3/24; F01N3/28; F01N9/00; F01N13/02; F01N13/04
Domestic Patent References:
| JP2005023921A | ||||
| JP10026017A |
Attorney, Agent or Firm:
Tomijio Sasashima