Renault S.a.s.

Karim Guenounou

Bernard Dionnet

Stephane Cochet

Marc Daneau

Laurent Leprieur

Marc Guyon

Valerie Vayssie

The invention concerns a method which consists in arranging a oxygen probe () of an exhaust pipe and observing that substantial unique increase of said representative signal towards a threshold value Scalculated 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 Sare used for diagnosing its ageing condition. The invention also concerns a device for implementing said method.

Method and device for managing the operation of a nitrogen oxide trap, and diagnosing its ageing condition

The invention concerns a method for controlling the operating conditions of a probe () associated with means purifying () exhaust gases of an internal combustion engine (), which consists in comparing an output signal of the probe with a reference value, and in acting on the probe () to decrease a difference between the output signal (S) and the reference value.

Method for controlling the operation of a probe

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Saint Maur, France

Karim Guenounou