Title:
EXHAUST EMISSION CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP3929215
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To stabilize combustion in a cylinder operated in a rich air-fuel ratio and prevent plug smoldering when an air-fuel ratio control in each of cylinder groups is carried out for rising catalyst temperature.
SOLUTION: When the air-fuel ratio control in each of cylinder groups is carried out for rising temperature of an NOx catalyst 8, An ECU 20 controls a main injection amount such that a lean air-fuel ratio is realized in a first cylinder group constituted of a first cylinder 1A and a fourth cylinder 1D, and a slight rich air-fuel ratio (about 12.5) is realized in a second cylinder group constituted of a second cylinder 1B and a third cylinder 1C. In the second cylinder 2B and the third cylinder 1C of the second cylinder group, the ECU 20 carries out sub injection of fuel in an expansion stroke and an exhaust stroke. Accordingly, an air-fuel ratio of an exhaust gas discharged from the second cylinder group is made to be a strongly rich air-fuel ratio (8 to 11) thereby ensuring an unburnt fuel component necessary for rising temperature of the NOx catalyst 8.
Inventors:
Shigeki Miyashita
Application Number:
JP29113699A
Publication Date:
June 13, 2007
Filing Date:
October 13, 1999
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
F01N3/20; F02D41/34; F01N3/24; F02D41/02; F02D41/04; F02D41/36; (IPC1-7): F02D41/34; F01N3/20; F01N3/24; F02D41/02; F02D41/04; F02D41/36
Domestic Patent References:
| JP1162563A | ||||
| JP11280529A | ||||
| JP10122015A | ||||
| JP11223148A | ||||
| JP9112251A |
Attorney, Agent or Firm:
Yoshiyuki Kawaguchi
Hidemi Matsukura
Yutaka Nagata
Tsutomu Toyama
Mayuko Wakuda
Hidemi Matsukura
Yutaka Nagata
Tsutomu Toyama
Mayuko Wakuda