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Title:
DETERIORATION DIAGNOSTIC METHOD AND DETERIORATION DIAGNOSTIC DEVICE FOR FUEL REFORMING CATALYST
Document Type and Number:
Japanese Patent JP2018009492
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To detect deterioration of a fuel reforming catalyst 18 before regeneration of an upstream end 31a side portion of a catalyst carrier 31 becomes impossible.SOLUTION: As a fuel reforming system for supplying hydrogen to a combustion chamber, a fuel reforming catalyst 18 and a fuel injection valve 19 for reformed fuel are disposed in an EGR passage of an internal combustion engine. A catalyst temperature sensor 27 is provided in the fuel reforming catalyst 18. Based on a temporal change of a temperature decline caused by heat absorption reaction during reforming, a diagnosis of deterioration is made. The fuel reforming catalyst 18 has a catalyst volume twice as large as a minimum catalyst volume required for reforming. In response to this characteristic, a temperature measurement point 27a of the catalyst temperature sensor 27 is disposed in a range of up to a half from an upstream end 31a of a catalyst carrier 31 and on the downstream side of an oxidation reaction region L1 in the vicinity of the upstream end 31a.SELECTED DRAWING: Figure 2

Inventors:
ASHIDA KOICHI
HIRATANI KOJI
SHINJO TAKASHI
Application Number:
JP2016138100A
Publication Date:
January 18, 2018
Filing Date:
July 13, 2016
Export Citation:
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Assignee:
NISSAN MOTOR
International Classes:
F02M27/02; C01B3/38; F02B51/02; F02D19/02; F02D19/08; F02D45/00; F02M26/06; F02M26/36
Domestic Patent References:
JP2013007336A2013-01-10
JP2016020645A2016-02-04
JP2006206405A2006-08-10
JP2007284322A2007-11-01
JP2004315320A2004-11-11
JP2016130186A2016-07-21
Foreign References:
US20140260203A12014-09-18
CN105649828A2016-06-08
Attorney, Agent or Firm:
Hiromichi Kobayashi
Tomioka Kiyoshi