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Title:
METHOD AND DEVICE FOR DIAGNOSING EXHAUST EMISSION CONTROL DEVICE
Document Type and Number:
Japanese Patent JP2007211773
Kind Code:
A
Abstract:

To provide a method and a device for diagnosing an exhaust emission control device guaranteeing high diagnosis reliability.

In the method and device for diagnosing the exhaust emission control device 14, reaction agent pressure between a first and a second valve FCV, DDV and/or between the second valve DDV and an injection valve HCIV are measured and pressure measurement signal p1_HX, p2_HC are used as base of diagnosis. The first and the second valve FCV, DDV are alternately opened in one change over cycle, release time ti_D_FCV, ti_D_DDV and/or cycle ti_P of the first and the second valves FC V, DDV are defined to maintain generated diagnosis volume flow rate ms_HC_D smaller than distribution capacity flow rate ms_HC_D. Consequently, the influence of a dynamic process of reaction agent flow in a reaction agent passage 30 is reduced to improve reliability of diagnosis result and enable diagnosis of small leak.

COPYRIGHT: (C)2007,JPO&INPIT


Inventors:
REUSING VOLKER
STEIN STEFAN
SCHOLL RALF
KEUSEN GUENTER
BORK CARSTEN
Application Number:
JP2007026255A
Publication Date:
August 23, 2007
Filing Date:
February 06, 2007
Export Citation:
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Assignee:
ROBERT BOSCH GMBH
International Classes:
F01N3/18; B01D53/86; F01N3/08; F01N3/36
Domestic Patent References:
JP2007532824A2007-11-15
JP2002213231A2002-07-31
JP2007509275A2007-04-12
JP2002188428A2002-07-05
Foreign References:
DE102004061247A12006-06-29
Attorney, Agent or Firm:
社本 一夫
小野 新次郎
小林 泰
千葉 昭男
富田 博行