Title:
EXHAUST EMISSION CONTROL DEVICE OF ENGINE
Document Type and Number:
Japanese Patent JP2018155126
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To accurately control an air-fuel ratio of exhaust gas to a target air-fuel ratio necessary for NOx reduction.SOLUTION: A NOx catalyst 41 arranged in an exhaust passage 40 of an engine 1 occludes NOx in exhaust gas when an air-fuel ratio of exhaust gas is in a leaner state than the stoichiometric air-fuel ratio, and reduces the occluded NOx when an air-fuel ratio of exhaust gas is in the vicinity of the stoichiometric air-fuel ratio or is in a richer state than the stoichiometric air-fuel ratio. By control of a controller U, when a NOx reduction condition is satisfied, NOx reduction control is executed for setting an air-fuel ratio of exhaust gas at a target air-fuel ratio which allows reduction of NOx. When executing the NOx reduction control, an electric supercharger 23 is driven so that an air-fuel ratio of exhaust gas is kept at the target air-fuel ratio allowing reduction of NOx.SELECTED DRAWING: Figure 3
Inventors:
KANNO MASANOBU
YAMAGUCHI YOSHIMASA
TETSUNO MASAYUKI
YAMAGUCHI YOSHIMASA
TETSUNO MASAYUKI
Application Number:
JP2017050881A
Publication Date:
October 04, 2018
Filing Date:
March 16, 2017
Export Citation:
Assignee:
MAZDA MOTOR
International Classes:
F01N3/20; B01D53/94; F01N3/08; F01N3/24; F02B37/00; F02B37/04; F02B37/12; F02B37/18; F02B37/24; F02D21/08; F02D23/00; F02D43/00; F02M26/08; F02M26/15
Domestic Patent References:
| JP2007162550A | 2007-06-28 | |||
| JP2009191686A | 2009-08-27 | |||
| JPH07279718A | 1995-10-27 |
Foreign References:
| WO2012070148A1 | 2012-05-31 |
Attorney, Agent or Firm:
Minoru Murata
Kiyotaka Totsuka
Kiyotaka Totsuka