Title:
EXHAUST GAS PURIFICATION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2005/124116
Kind Code:
A1
Abstract:
An exhaust gas purification apparatus wherein a selective reduction type catalyst (10) is provided on the way of an exhaust pipe (9) and a urea water (17) (a reducing agent) is added upstream from said selective reduction type catalyst (10) by the use of a urea water addition means (18) (reducing agent addition means), to reduce and purify NOx, which comprises NOx sensors (24 and 25) being provided in the entrance side and the exit side of the selective reduction type catalyst (10), respectively, for detecting NOx concentrations, and an NOx purification control device (23) (control device) which determines to be abnormal when a prescribed NOx reduction rate is not achieved, based on the detection signals (24a, 25a) from both NOx sensors (24 and 25), and instructs the limitation of the amount of the spray of a fuel under the condition having been determined to be abnormal. The above apparatus can be suitably used for minimizing the increase in the amount of the discharge of NOx under conditions wherein an NOx purification system is abnormal.
Inventors:
HOSOYA MITSURU (JP)
SHIMODA MASATOSHI (JP)
SHIMODA MASATOSHI (JP)
Application Number:
PCT/JP2005/011022
Publication Date:
December 29, 2005
Filing Date:
June 16, 2005
Export Citation:
Assignee:
HINO MOTORS LTD (JP)
HOSOYA MITSURU (JP)
SHIMODA MASATOSHI (JP)
HOSOYA MITSURU (JP)
SHIMODA MASATOSHI (JP)
International Classes:
B01D53/94; F01N3/08; F01N3/20; F01N3/28; F01N11/00; F02D41/14; F02D41/22; F02D45/00; F02D41/02; (IPC1-7): F01N3/08; B01D53/94; F01N3/20; F01N3/28; F02D41/22; F02D45/00
Foreign References:
| JPH0476923U | 1992-07-06 | |||
| JPH07166851A | 1995-06-27 | |||
| JPH06264787A | 1994-09-20 | |||
| JPH11336531A | 1999-12-07 | |||
| JP2003293739A | 2003-10-15 |
Other References:
See also references of EP 1767754A4
Attorney, Agent or Firm:
Yamada, Tsunemitsu (5-3 Uchikanda 3-chome, Chiyoda-k, Tokyo 47, JP)
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