Title:
配量弁の作動方法および装置
Document Type and Number:
Japanese Patent JP2007509275
Kind Code:
A
Abstract:
A method for operating a metering valve and a device for performing the method, providing for diagnosis of the metering valve which defines a flow rate of a reagent to be introduced into an exhaust gas area of an internal combustion engine. The diagnosis is performed on the basis of an analysis of a measure for the flow rate during a diagnosis time. According to a first embodiment, after a diagnosis start signal has occurred with the metering valve closed, the reagent is brought to a predefined diagnosis starting pressure via a pump; the metering valve is then set at a predefined flow rate and the pressure difference occurring during the diagnosis time is analyzed. According to another embodiment, the amount of reagent delivered by the metering valve during the diagnosis time into a graduated beaker is analyzed.
Inventors:
Gerlach, Michael
Application Number:
JP2006536104A
Publication Date:
April 12, 2007
Filing Date:
December 08, 2004
Export Citation:
Assignee:
ROBERT BOSCH GMBH
International Classes:
F01N3/08; F01N3/029; F01N3/18; F01N3/20; F01N9/00; F01N11/00; B01D53/94
Domestic Patent References:
| JP2002147223A | 2002-05-22 | |||
| JP2002242663A | 2002-08-28 | |||
| JP2002242780A | 2002-08-28 | |||
| JP2002038928A | 2002-02-06 |
Attorney, Agent or Firm:
Kazuo Shamoto
Shinjiro Ono
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Shinjiro Ono
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita