| 摘要 |
<p>This method is for detecting urea deposits in an exhaust line of an automotive vehicle, This method comprises the following steps: a) determination (101 ) if an exhaust gases temperature (T0) is reached, b) if the result of determination made at step a) is positive, stoppage (103) of urea injection, c) determination (106) of the quantity of NOx in the exhaust gases on the outlet of the selective catalytic reduction system, d) comparison (108) between the quantity of NOx determined at step c) and a theoretical quantity or a measured quantity of NOx produced by the internal combustion engine, e) if step d) shows that said quantities are different, considering that urea deposits are present in the exhaust line. The vehicle is equipped with means adapted to stop (103) operation of the urea injection system, to compare (108) 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 (109) cleaning of the exhaust line on the basis of the result of the comparison (108) between said quantities.</p> |
