Patent ID: 7946110

Claim:
A method of assisting the regeneration of a depollution device by O 2 combustion of soot, wherein the depollution device is associated with an oxidation catalyst implementing an OSC function, constituting a supply of O 2 and integrated in an exhaust line of a motor vehicle diesel engine, in which the oxidation catalyst constituting a supply of O 2 is located upstream of the depollution device and the engine is associated with a common rail for feeding its cylinders with fuel, the method comprising: analyzing the running conditions of the vehicle, and comparing them with predetermined threshold values including a threshold value of a temperature level in the vehicle exhaust line, and controlling the engine in a first regeneration operation mode by molecular O 2 combustion of the soot with a lean mixture when running conditions are above the threshold values, or in a second regeneration operating mode by molecular O 2 combustion of the soot implementing sequences in which engine operation alternates between stages of rich mixture operation and of lean mixture operation as long as conditions are below the threshold values including the temperature threshold value, to raise the temperature level in the vehicle exhaust line as long as the temperature is under the temperature threshold value, so that during rich mode, oxygen is released from the oxidation catalyst to promote combustion of reducing agents, so as to raise temperature levels at an inlet to the depollution device.