System to regenerate a trap in the exhaust of an internal combustion engine

System helps regeneration of depollution means (1) integrated into an exhaust line (2) of the heat engine (3) of a motor vehicle, by tilting the engine between operation in lean mode and one in rich mode, according to different parameters (7, 8) for controlling the operation of this engine, characterized by the fact that it comprises means (9) for measuring the temperature of the feed gases of the engine and means (8) for correcting at least one control parameter of engine operation in rich mode in accordance with said measured temperature with, and by the fact that between the means of measuring the temperature include a temperature sensor of the compressed air between a compressor of a turbocharger and a cooler associated air motor (3).