Title:
METHOD AND DEVICE FOR MANAGING THE OPERATION OF A NITROGEN OXIDE TRAP, AND DIAGNOSING ITS AGEING CONDITION
Document Type and Number:
WIPO Patent Application WO2006003341
Kind Code:
A8
Abstract:
The invention concerns a method which consists in arranging a oxygen probe (21) of an exhaust pipe and observing that substantial unique increase of said representative signal towards a threshold value S1 calculated from the start of the bleeding of the nitrogen oxide trap, obtained following a variation subsequent to shift of the engine from lean mixture operating conditions to rich mixture operating conditions, being used as indicator for controlling the end of the bleeding operation. The invention is characterized in that the integration of the signal representing the time between the start of the bleeding and the end of the bleeding, then the comparison of the integration value to a threshold value S2 are used for diagnosing its ageing condition. The invention also concerns a device for implementing said method.
Inventors:
DIONNET BERNARD (FR)
GUENOUNOU KARIM (FR)
GUYON MARC (FR)
LEPRIEUR LAURENT (FR)
COCHET STEPHANE (FR)
GUENOUNOU KARIM (FR)
GUYON MARC (FR)
LEPRIEUR LAURENT (FR)
COCHET STEPHANE (FR)
Application Number:
PCT/FR2005/050452
Publication Date:
May 18, 2006
Filing Date:
June 16, 2005
Export Citation:
Assignee:
RENAULT SA (FR)
DIONNET BERNARD (FR)
GUENOUNOU KARIM (FR)
GUYON MARC (FR)
LEPRIEUR LAURENT (FR)
COCHET STEPHANE (FR)
DIONNET BERNARD (FR)
GUENOUNOU KARIM (FR)
GUYON MARC (FR)
LEPRIEUR LAURENT (FR)
COCHET STEPHANE (FR)
International Classes:
B01D53/30; B01D53/56; B01D53/94; F01N3/08; F01N3/20; F01N11/00; F02D41/00; F02D41/02; F02D41/14; F01N13/02; F02B37/00; (IPC1-7): F02D41/02
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