Title:
A urea water amount-of-consumption diagnostic device for urea SCR
Document Type and Number:
Japanese Patent JP6011332
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an urea water consumption diagnosis device for an urea SCR, which can detect the normality and abnormality of urea water injection from a dosing valve.SOLUTION: An urea water consumption diagnosis device for an urea SCR comprises: an urea water pressure sensor 23 for detecting supply pressure of urea water reaching a dosing valve 12 from a supply pump 18; urea water pressure determination means 34 for detecting a startup time from when an ignition key 25 is turned on and the supply pump 18 is activated until when pressure at startup reaches specified pressure, to determine the presence or absence of abnormality of the urea water pressure; and abnormality diagnosis means 33 for determining a difference between an urea water injection amount injected from the dosing valve 12 and urea water consumption in an urea water tank, and determining the presence or absence of the clogging of the urea water in a pressure-sending line or in the dosing valve according to the presence or absence of the abnormality of the urea water pressure from the urea water pressure determination means 34.
Inventors:
Nihongi Shigeru
Hirotaka Takahashi
Masanobu Minezawa
Takeshi Fukuoka
Yutaka Suzuki
Koichi Takahashi
Hirotaka Takahashi
Masanobu Minezawa
Takeshi Fukuoka
Yutaka Suzuki
Koichi Takahashi
Application Number:
JP2012288066A
Publication Date:
October 19, 2016
Filing Date:
December 28, 2012
Export Citation:
Assignee:
Isuzu Motors Limited
International Classes:
F01N3/08; F01N3/18
Domestic Patent References:
| JP2012002062A | ||||
| JP2008274765A | ||||
| JP2008082201A |
Foreign References:
| WO2012063530A1 |
Attorney, Agent or Firm:
Nobuo Kinutani
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