Power plants – Internal combustion engine with treatment or handling of... – Methods
Reexamination Certificate
2005-06-16
2009-10-20
Tran, Binh Q. (Department: 3748)
Power plants
Internal combustion engine with treatment or handling of...
Methods
C060S276000, C060S285000, C060S295000, C060S297000
Reexamination Certificate
active
07603845
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 S1calculated 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 S2are used for diagnosing its ageing condition. The invention also concerns a device for implementing said method.
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Cochet Stephane
Dionnet Bernard
Guenounou Karim
Guyon Marc
Leprieur Laurent
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Renault S.A.S.
Tran Binh Q.
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