DEVICE FOR PURIFYING EXHAUST OF INTERNAL COMBUSTION ENGINE

Title:

DEVICE FOR PURIFYING EXHAUST OF INTERNAL COMBUSTION ENGINE

Document Type and Number:

WIPO Patent Application WO/1993/007363

Kind Code:

A1

Abstract:

NOx absorbent (18) is disposed in the exhaust gas path in the internal combustion engine and exhaust gas is adapted to flow constantly through said absorbent (18) during the operation of said engine. NOx absorbent (18) absorbs NOx when an air-fuel ratio of exhaust gas flowing into said absorbent (18) is lean and, when an air-fuel ratio of exhaust gas becomes equal to the theoretical air-fuel ratio or rich, it discharges NOx having been absorbed therein. Over almost the entire range of operation of the engine, lean mixed gas is burnt in the combustion chamber (3) and NOx generated at this time is absorbed by said absorbent (18). An air-fuel ratio of exhaust gas flowing into the NOx absorbent (18) is periodically made equal to the theoretical one or rich and NOx having been absorbed by the absorbent (18) is discharged and reduced at the same time.

Inventors:

TAKESHIMA SHINICHI (JP)
NAKANISHI KIYOSHI (JP)
IGUCHI SATOSHI (JP)
TANAKA TOSHIAKI (JP)
ARAKI YASUSHI (JP)
HIROTA SINYA (JP)
KOBASHI KIYOSHI (JP)

Application Number:

PCT/JP1992/001279

Publication Date:

April 15, 1993

Filing Date:

October 02, 1992

Export Citation:

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Assignee:

TOYOTA MOTOR CO LTD (JP)

International Classes:

B01D53/04; F01N3/08; F01N3/20; F01N9/00; F02D41/02; F01N13/02; F02B1/04; (IPC1-7): F01N3/18; F01N3/24

Foreign References:

JPH0316641A	1991-01-24
JPS63270543A	1988-11-08
JPH02149346A	1990-06-07
JPH044044A	1992-01-08
JPS61181538A	1986-08-14
JPS60164642A	1985-08-27
JPS59188053A	1984-10-25
JPS6338619U	1988-03-12
JPH01134020A	1989-05-26

Other References: