Title:
EXHAUST EMISSION CONTROL SYSTEM AND METHOD FOR INTERNAL COMBUSTION ENGINES
Document Type and Number:
WIPO Patent Application WO/2001/029387
Kind Code:
A1
Abstract:
An NO¿x? occlusion reduction type catalyst having a saturation NO¿x? occlusion amount of at least 5 g per liter of catalyst volume in terms of NO¿2? at 500°C is used to control a rich spike so that an actual NO¿x? occlusion amount of the NO¿x? occlusion reduction type catalyst is up to 50% of a saturation NO¿x? occlusion amount. Because of a large saturation NO¿x? occlusion amount, an NO¿x? occlusion amount, even if up to 50%, is large so as to provide larger rich spike intervals. In addition, NO¿x? can be preferentially occluded in a site where an NO¿x? occlusion material is easy to occlude and release to enhance a reduction efficiency. Therefore, an NO¿x? reduction efficiency can be enhanced while maintaining a fuel efficiency effect by increasing rich spike intervals.
Inventors:
MATSUNAGA SHINICHI (JP)
KUBO SHUICHI (JP)
SAIKI MOTOHISA (JP)
KUBO SHUICHI (JP)
SAIKI MOTOHISA (JP)
Application Number:
PCT/JP2000/007176
Publication Date:
April 26, 2001
Filing Date:
October 16, 2000
Export Citation:
Assignee:
TOYODA CHUO KENKYUSHO KK (JP)
MATSUNAGA SHINICHI (JP)
KUBO SHUICHI (JP)
SAIKI MOTOHISA (JP)
MATSUNAGA SHINICHI (JP)
KUBO SHUICHI (JP)
SAIKI MOTOHISA (JP)
International Classes:
B01D53/94; F01N3/08; F02D41/02; F02D41/14; (IPC1-7): F02D41/04; B01D53/94; B01J23/58; F01N3/08; F01N3/24; F01N3/28
Domestic Patent References:
| WO1993007363A1 | 1993-04-15 |
Foreign References:
| JPH10249199A | 1998-09-22 | |||
| JPH11107741A | 1999-04-20 |
Attorney, Agent or Firm:
Ohkawa, Hiroshi (Nagoya-shi Aichi-ken, Nagoya-shi Aichi-ken, JP)
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