METHOD TO CONTROL COMBUSTION INSIDE A BURNER OF AN EXHAUST GAS AFTER-TREATMENT SYSTEM

A method to control combustion inside the combustion chamber (22) of a burner (21) of an exhaust gas after-treatment system (14) is described. The method provides for placing a first pressure sensor (33, 34) along a first duct (25, 35) of the exhaust gas after-treatment system (14); acquiring the signal detected by said first pressure sensor (33, 34), processing the signal detected by the first pressure sensor (33, 34) determining the energy content thereof; calculating a combustion index; and recognising a failed combustion event inside the combustion chamber (22) in case the combustion index is smaller than a threshold value (TVOFF).