Title:
ENGINE EXHAUST PURIFICATION DEVICE
Document Type and Number:
WIPO Patent Application WO2001063105
Kind Code:
A3
Abstract:
A microprocessor (6) computes an oxygen storage amount of a catalyst (3) separately for a high speed component and a low speed component in accordance with real characteristic. A target air-fuel ratio of an engine (1) is computed and air-fuel ratio control of the engine (1) it is performed so that the high speed component is constant. The deterioration of the catalyst (3) is determined by integrating the high speed component of the oxygen storage amount computed during the air-fuel ratio control process for a predetermined number of times, and comparing its average value with a determining value. The oxygen storage amount of the high speed component which is sensitive to catalyst deterioration is integrated so as to obtain a highly precise determining result to determine the deterioration.
Inventors:
KAKUYAMA MASATOMO (JP)
KAKIZAKI SHIGEAKI (JP)
MATSUNO OSAMU (JP)
KAKIZAKI SHIGEAKI (JP)
MATSUNO OSAMU (JP)
Application Number:
PCT/JP2001/001366
Publication Date:
March 21, 2002
Filing Date:
February 23, 2001
Export Citation:
Assignee:
NISSAN MOTOR (JP)
KAKUYAMA MASATOMO (JP)
KAKIZAKI SHIGEAKI (JP)
MATSUNO OSAMU (JP)
KAKUYAMA MASATOMO (JP)
KAKIZAKI SHIGEAKI (JP)
MATSUNO OSAMU (JP)
International Classes:
F02D45/00; F01N3/20; F01N11/00; F02D41/02; F02D41/14; (IPC1-7): F01N11/00
Domestic Patent References:
| WO1998038416A1 | 1998-09-03 | |||
| WO1998038415A1 | 1998-09-03 |
Foreign References:
| US5363646A | 1994-11-15 | |||
| US5901552A | 1999-05-11 |
Download PDF: