System for assisting the regeneration of a catalytic particle filter

A system for the regeneration of a particle filter (4) placed downstream of an oxidation catalyst (3) in the exhaust line of a diesel engine comprises a shunt circuit in parallel with the catalyst unit and provided with means for control (6) of gas circulation in both circuits. Regeneration of the filter is initiated by diverting part of the gases, containing unburnt hydrocarbons, to the filter without passing through the catalyst.