Title:
EXHAUST EMISSION CONTROL DEVICE OF INTERNAL COMBUSTION ENGINES
Document Type and Number:
WIPO Patent Application WO/2000/060229
Kind Code:
A1
Abstract:
An NOx sensor (27) detects an NOx concentration released to the atmosphere from an occlusion type NOx catalyst (25); a total NOx exhaust amount (A) is calculated based on the output from the NOx sensor (27); when a total NOx emission amount (A) reaches an NOx emission decision amount (A¿0?) corresponding to an NOx emission decision amount specified by the NOx Emission Regulation before a running distance (C) reaches a preset running distance (C¿0?), an exhaust air/fuel ratio is changed to a rich air/fuel ratio to thereby efficiently release NOx from the occlusion type NOx catalyst (25); and then a theoretical air/fuel ratio is changed to clean and reduce NOx by a three-way catalyst function.
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Inventors:
OKADA KOJIRO (JP)
DOGAHARA TAKASHI (JP)
TAMURA YASUKI (JP)
DOGAHARA TAKASHI (JP)
TAMURA YASUKI (JP)
Application Number:
PCT/JP2000/001990
Publication Date:
October 12, 2000
Filing Date:
March 30, 2000
Export Citation:
Assignee:
MITSUBISHI MOTORS CORP (JP)
OKADA KOJIRO (JP)
DOGAHARA TAKASHI (JP)
TAMURA YASUKI (JP)
OKADA KOJIRO (JP)
DOGAHARA TAKASHI (JP)
TAMURA YASUKI (JP)
International Classes:
F02D41/02; F02D41/14; F02D41/40; F01N3/08; F01N9/00; F01N13/02; (IPC1-7): F02D41/04; F02D41/34; F01N3/08; F01N3/24; F01N3/28
Foreign References:
| JPS61234254A | 1986-10-18 | |||
| JPH0763151A | 1995-03-07 | |||
| JPH07208151A | 1995-08-08 | |||
| JPH06330741A | 1994-11-29 | |||
| JPH07166851A | 1995-06-27 | |||
| JPH07139342A | 1995-05-30 | |||
| JPH02586738A | ||||
| JPH07166851A | 1995-06-27 | |||
| JPH02503387A | 1990-10-18 |
Other References:
See also references of EP 1087119A4
Attorney, Agent or Firm:
Mitsuishi, Toshiro (Akasaka 1-chome Minato-ku, Tokyo, JP)
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