The invention concerns a system for assisting regeneration of pollution management means (1) associated with oxidation catalyst forming means (2) and integrated in an exhaust line (3) of a motor vehicle diesel engine (4), wherein the engine is associated with common ramp means (7, 8) supplying fuel to the cylinders of the engine, adapted, through modification of engine operation control parameters and use of fuel post-injections into the cylinders thereof, to shift the engine (4) among four strategies of regeneration of the pollution management means (1), the first called normal engine operation strategy, the second called level 1 strategy, the third called level 2 strategy and the fourth called over-calibrated level 2 strategy, enabling different thermal levels to be achieved in the exhaust line (3).