Title:
EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP3123438
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To suitably discharge and reduce Nox which is absorbed in an absorbing and reducing type lean Nox catalyst according to a stratified degree in an engine combustion chamber.
SOLUTION: A device comprises an absorbing and reducing type lean Nox catalyst 17 for absorbing Nox when an air-fuel ratio is in a lean condition and for discharging and reducing its absorbed Nox when the air-fuel ratio is in a rich condition in an exhaust system, means 27 for changing stratified degree of mixture in a combustion chamber by varying flow speed of swirl flow which flows in from a helical port or by varying a fuel injection timing in an intake stroke, and means 30 for correcting a rich time or a timing for making the air-fuel ratio in a rich condition according to the stratified degree.
Inventors:
Tetsuro Kihara
Application Number:
JP20231096A
Publication Date:
January 09, 2001
Filing Date:
July 31, 1996
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
F02B31/00; F01N3/20; F01N3/24; F02D41/02; F02D41/04; (IPC1-7): F02D41/04; F01N3/20; F01N3/24; F02D41/02
Domestic Patent References:
| JP7332071A | ||||
| JP1163436A | ||||
| JP5222978A | ||||
| JP60237140A | ||||
| JP6030440A | ||||
| JP62189324A |
Attorney, Agent or Firm:
Takashi Ishida (3 others)