Volvo Trucks has just admitted to serious engine emission control problems in a new Press Release. The problem is not clearly defined, but rather the press release vaguely refers to it as follows:
One possible source that fits with this wording is degradation of an SCR catalyst using reductant injection. Another, previous, Volvo Press Release touted the advantages of such as system:
So we looked to see if Volvo has any patents describing such as system and found US 9,097,159, related to a method for detecting urea deposits in an exhaust line of an automotive vehicle, a method for eliminating urea deposits and an automotive vehicle adapted to such methods. The abstract explains the method is for detecting urea deposits in an exhaust line of an automotive vehicle and includes determination if an exhaust gas's 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.
Volvo may have discovered their in-use problem via a diagnostic approach just like the one above. The question now is - what can they do to solve the issue. No doubt, whatever the solution, it may generate important IP that other competitors may not even realize they need.