Method for the post-injection of hydrocarbon-, alcohol-...

F - Mech Eng,Light,Heat,Weapons – 01 – N

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F01N 3/025 (2006.01) F01N 3/023 (2006.01) F01N 3/035 (2006.01) F01N 3/20 (2006.01) F01N 3/30 (2006.01) F01N 3/36 (2006.01) F01N 13/02 (2010.01) F01N 13/04 (2010.01)

Patent

CA 2514469

The invention relates to a post-injection method for the regeneration of a device used to filter exhaust gases produced by a diesel engine. The inventive method consists essentially in injecting fully-pulverised hydrocarbon-, alcohol- and/or reducing-agent-type regeneration solution (e.g. diesel fuel and/or urea and/or ammoniacal solution) upstream of the oxidation catalyst (14) in order to increase the temperature of the exhaust gases upon detection of the clogging of the filter with particles. Using temperature (2) and pressure (3) sensors which are disposed upstream of the filtration device, the computer (8) controls the injection of the regeneration solution from the electromagnetic injector (9), said regeneration solution being directed through a capillary (12) into the exhaust pipe (1) at a point which is located at a good distance from the aforementioned injector, upstream of the catalyst (5), in order to be finely pulverised by the air.

La présente invention concerne un procédé de post injection pour la régénération de dispositif de filtration des gaz d'échappement produits par un moteur diesel. Ce procédé consiste essentiellement à pouvoir injecter du liquide de régénération du type hydrocarbure, alcool et/ou agent réducteur (e.g. gazole et/ou urée et/ou solution ammoniacale) parfaitement pulvérisé en amont du catalyseur d'oxydation en (14) pour pouvoir augmenter la température des gaz d'échappement lorsqu'un début de colmatage du filtre à particules est détecté. A partir des sondes de température (2) et de pression (3) disposées en amont du dispositif de filtration, le calculateur (8) commande l'injection du liquide de régénération à partir de l'injecteur électromagnétique (9) le liquide de régénération étant dirigé par un capillaire (12) dans le conduit d'échappement (1) à un endroit situé géographiquement à bonne distance de l'injecteur, en amont du catalyseur (5) et pour être pulvérisé finement par de l'air.

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