System and method for monitoring a particulate filter regeneration temperature within the exhaust line of an internal combustion engine

Method and system for controlling the periodic regeneration at limited temperature of a particulate filter (7) placed at the exhaust (2) of a thermal engine (1), diesel type for example, by combustion of the particles retained in the filter. The method essentially comprises a measurement of the temperature (T) prevailing in the particulate filter, and a modulation of the residual oxygen rate in the exhaust gases so that the measured combustion temperature (T) does not exceed a defined ceiling (Ts), depending on the thermal resistance of the particulate filter so as to limit its degradation. This modulation is obtained for example by modification of the engine richness, by varying the exhaust gas recirculation rate (EGR: Exhaust Gas Recirculation), by acting on the injection, on a valve placed at the intake, on the total or partial opening of a bypass of the turbine placed at the exhaust of the engine (turbine which makes it possible to unload the compressor and thus to act on the flow of fresh gases), etc., these actions being able to be combined. Applications to the automotive industry.