WARMING-UP METHOD OF EXHAUST EMISSION CONTROL CATALYST FOR INTERNAL COMBUSTION ENGINE

Japanese Patent JP2018009493

A

PROBLEM TO BE SOLVED: To achieve early activation of an exhaust emission control catalyst, while suppressing unburned HC at cold start time.SOLUTION: An internal combustion engine includes a fuel reforming system including a fuel reforming catalyst and a fuel injection valve for reforming fuel in an EGR passage, and has an air introduction passage for supplying additional air to the fuel reforming catalyst. At cold start (t0), ignition timing retard is started for warming-up of an exhaust emission control catalyst, and at the same time, a temperature raise mode is executed for supplying a small amount of the fuel for reforming and additional air to the reforming system. When the fuel reforming catalyst has reached an activation temperature (t1), as a hydrogen start mode, sufficient fuel for reforming and additional air are supplied to the reforming system, and hydrogen concentration in the reforming gas is enhanced. By introducing high concentration hydrogen to a combustion chamber, HC generation during ignition timing retard is suppressed.SELECTED DRAWING: Figure 5

ASHIDA KOICHI
HIRATANI KOJI
SHINJO TAKASHI
KOIKE MASAO

JP2016138101A

January 18, 2018

July 13, 2016

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NISSAN MOTOR

F01N3/20; B01D53/94; F01N3/24; F02D19/02; F02D19/08; F02D41/02; F02D41/06; F02D43/00; F02D45/00; F02M21/02; F02M26/06; F02M26/36; F02M27/02

JP2013148034A	2013-08-01
JP2005048631A	2005-02-24
JP2014125980A	2014-07-07
JP2014025375A	2014-02-06
JPH08121259A	1996-05-14
JPH11107840A	1999-04-20

Hiromichi Kobayashi
Tomioka Kiyoshi

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