ENGINE EXHAUST PURIFICATION ARRANGEMENT

Title:

ENGINE EXHAUST PURIFICATION ARRANGEMENT

Document Type and Number:

WIPO Patent Application WO2001063109

Kind Code:

A3

Abstract:

A controller (6) computes an oxygen storage amount of a catalyst (3) separately as a high speed component/amount and a low speed component/amount according to predetermined release/adsorption characteristics. A target air-fuel ratio of an engine is computed and the air-fuel ratio of the engine is controlled so that the high speed component is maintained constant. The target air-fuel ratio of the engine (1) is limited by an upper limiter and lower limiter so that the high speed component converges to the target value, an excessively large variation of the air-fuel ratio is prevented, and impairment of drivability and fuel cost-performance is also prevented. Further, after lean running due to fuel cut, etc., the lower limiter is lowered to the rich side, and the oxygen storage amount is rapidly induced to converge on the target value.

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Inventors:

KAKUYAMA MASATOMO (JP)
KAKIZAKI SHIGEAKI (JP)
MATSUNO OSAMU (JP)

Application Number:

PCT/JP2001/001403

Publication Date:

March 14, 2002

Filing Date:

February 26, 2001

Export Citation:

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Assignee:

NISSAN MOTOR (JP)
KAKUYAMA MASATOMO (JP)
KAKIZAKI SHIGEAKI (JP)
MATSUNO OSAMU (JP)

International Classes:

F02D45/00; F01N3/10; F01N3/20; F01N3/24; F01N11/00; F02D41/02; F02D41/12; F02D41/14; (IPC1-7): F02D41/02; F01N11/00

Domestic Patent References:

WO1995035152A1	1995-12-28
WO1996041071A1	1996-12-19

Foreign References:

US5609023A	1997-03-11
EP0885657A2	1998-12-23
EP0930425A2	1999-07-21

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