Urea concentration identifying system, method for...

G - Physics – 01 – N

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G01N 25/18 (2006.01) F01N 13/00 (2010.01) B01D 53/90 (2006.01) B01D 53/94 (2006.01) F01N 3/08 (2006.01) F01N 3/20 (2006.01) F01N 9/00 (2006.01) G01N 27/18 (2006.01)

Patent

CA 2498412

The urea concentration of a urea solution is identified accurately and quickly. A pulse voltage is applied for a predetermined time to a urea concentration identifying sensor heater which comprises a heater and a liquid temperature sensor for identification arranged in the vicinity of the heater, so that a urea solution to be identified is heated by the heater. The urea concentration is identified by a voltage output differential (V0) corresponding to a temperature differential between the initial temperature and the peak temperature of the liquid temperature sensor for identification.

La présente invention concerne un procédé pour identifier de manière précise et rapide la concentration d'urée d'une solution d'urée. Ce procédé consiste à appliquer une tension d'impulsion pendant une période prédéfinie sur un système de chauffage à capteur d'identification de concentration d'urée présentant un système de chauffage et un capteur de température de liquide d'identification, placé à proximité du système de chauffage, de façon qu'une solution d'urée soit chauffée par le système de chauffage. La concentration d'urée est identifiée au moyen d'un différentiel de sortie de tension (V0) correspondant à un différentiel de température entre la température initiale et la température maximale du capteur de température de liquide d'identification.

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