Title:
COLD START-COMPATIBLE UREA SCR SYSTEM
Document Type and Number:
WIPO Patent Application WO/2018/025827
Kind Code:
A1
Abstract:
Provided is a cold start-compatible urea SCR system using an exhaust gas purification device that has a diesel fuel injection means, a DOC, a lean NOx trap release (LNTR) material, an SCR, and a measurement and control means, wherein the DOC and LNTR are divided and supported above and below or in front and in back by a support, the DOC being situated in a top layer, a bottom layer or on a front side and the LNTR being situated in the top layer, the bottom layer, or on a back side, and wherein satisfactory nitrogen oxide reduction performance is exhibited, even when starting the engine when the exhaust gas temperature is low and urea water cannot be injected, by: continuously detecting the intake port temperature of the SCR starting from engine start and adsorbing emitted nitrogen oxide with the LNTR; injecting the diesel fuel when the SCR intake port temperature has reached a temperature suitable for denitrification; desorbing the nitrogen oxide as appropriate from the LNTR by combusting the injected diesel fuel on the DOC to raise the temperature of the exhaust gas; and causing the desorbed nitrogen oxide to come into contact, on the SCR, with the NH3 produced by injecting the urea water.
Inventors:
BANNO YASUYUKI (JP)
NAGATA MAKOTO (JP)
NAGATA MAKOTO (JP)
Application Number:
PCT/JP2017/027792
Publication Date:
February 08, 2018
Filing Date:
August 01, 2017
Export Citation:
Assignee:
N E CHEMCAT CORP (JP)
International Classes:
F01N3/20; F01N3/025; F01N3/035; F01N3/08; F01N3/24; F01N3/28; F01N3/36
Foreign References:
| JP2016079913A | 2016-05-16 | |||
| JP2014226651A | 2014-12-08 | |||
| JP2015151970A | 2015-08-24 | |||
| JP2016089721A | 2016-05-23 | |||
| JP3204682U | 2016-06-09 | |||
| JP2010190124A | 2010-09-02 |
Other References:
See also references of EP 3495634A4
Attorney, Agent or Firm:
THE PATENT CORPORATE BODY OF ONO & CO. (JP)
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