Title:
METHOD FOR DETECTING ABNORMALITY IN REDUCING AGENT
Document Type and Number:
WIPO Patent Application WO/2010/125725
Kind Code:
A1
Abstract:
Disclosed is a method for detecting an abnormality in a reducing agent (17) supplied to a reducing agent tank (14), in an exhaust purification device wherein the reducing agent (17) is added from the reducing agent tank (14) to a selective reduction type catalyst (10) on the way of an exhaust pipe (9) to thereby reduce and purify NOx, comprising: detecting the supply of the reducing agent (17) to the reducing agent tank (14); waiting for a period of time from the detection of the supply to the stabilization of the NOx purification ratio, as the purification ratio-stabilization period; and, when an abnormal decrease is detected in the measured NOx purification ratio during the determination period following the purification ratio-stabilization period, deciding that the reducing agent (17) at a low concentration and/or some other substance are supplied to the reducing agent tank (14).
Inventors:
NARITA, Hironori (1-1 Hinodai 3-chome,, Hino-sh, Tokyo 60, 〒1918660, JP)
Application Number:
JP2010/001231
Publication Date:
November 04, 2010
Filing Date:
February 24, 2010
Export Citation:
Assignee:
HINO MOTORS, LTD. (1-1 Hinodai 3-chome, Hino-shi Tokyo, 60, 〒1918660, JP)
日野自動車株式会社 (〒60 東京都日野市日野台３丁目１番地１ Tokyo, 〒1918660, JP)
日野自動車株式会社 (〒60 東京都日野市日野台３丁目１番地１ Tokyo, 〒1918660, JP)
International Classes:
F01N3/18; B01D53/86; B01D53/94; F01N3/08
Attorney, Agent or Firm:
patent firm YAMADA PATENT OFFICE (2nd Yahagi Bldg, 5-3 Uchikanda 3-chome, Chiyoda-k, Tokyo 47, 〒1010047, JP)
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