METHOD FOR DETECTING UREA DEPOSITS IN AN EXHAUST LINE OF AN AUTOMOTIVE VEHICLE, METHOD FOR ELIMINATING UREA DEPOSITS AND AUTOMOTIVE VEHICLE ADAPTED TO SUCH METHODS

摘要

A method is provided for detecting urea deposits in an exhaust line of an automotive vehicle and includes determination if an exhaust gases temperature is reached, if the result of determination is positive, stoppage of urea injection, and determination of the quantity of NOx in the exhaust gases on the outlet of the selective catalytic reduction system. A comparison is performed between the quantity of NOx determined on the outlet of the selective catalytic reduction system and a theoretical quantity or a measured quantity of NOx produced by the internal combustion engine. If the comparison shows that the quantities are different, it is considered that urea deposits are present in the exhaust line. The vehicle is arranged to stop operation of the urea injection system, to compare a quantity of NOx measured by the NOx sensor to a theoretical NOx quantity or a measured NOx quantity produced by the internal combustion engine, and to perform cleaning of the exhaust line on the basis of the result of the comparison between the quantities.