Title:
REDUCTANT SUPPLY DEVICE
Document Type and Number:
Japanese Patent JP2015090109
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To execute removal control to remove reductant deposits accumulated around an addition valve, when necessary.SOLUTION: When deposits of urea, etc. are accumulated around an addition valve 7, the deposits cause urea water to be difficult to be added from the addition valve 7 and thus the flow amount of the urea water when added is smaller than in a normal state. Thus, the pressure of the urea water to be supplied to the addition valve 7 is adjusted to be a target value without so much increasing the rotating speed of a pump 9, and the rotating speed of the pump 9 tends to be lower than in the normal state of the addition valve 7. Even when gas mixed into the urea water to be supplied into the addition valve 7 is repeatedly expanded and shrunk in a short time, the rotating speed of the pump 9 at this time is difficult to be influenced therefrom. Removal control is performed to remove the deposits on the basis of the fact that the rotating speed of the pump 9 during the addition of the urea water from the addition valve 7 is lower than a determined value. The removal control can be executed when necessary.
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Inventors:
TSUCHIYA TOMIHISA
Application Number:
JP2013230207A
Publication Date:
May 11, 2015
Filing Date:
November 06, 2013
Export Citation:
Assignee:
TOYOTA MOTOR CORP
International Classes:
F01N3/08; B01D53/86; B01D53/94
Domestic Patent References:
| JP2010516934A | 2010-05-20 | |||
| JP2009264191A | 2009-11-12 | |||
| JP4964353B1 | 2012-06-27 | |||
| JP2011017250A | 2011-01-27 | |||
| JP2013224655A | 2013-10-31 |
Foreign References:
| WO2011161162A1 | 2011-12-29 |
Attorney, Agent or Firm:
Makoto Onda
Hironobu Onda
Hironobu Onda