METHOD AND DEVICE FOR REGENERATING AN EXHAUST GAS POST-TREATMENT DEVICE

摘要

Method of controlling the temperature of a device (9, 10) for the post-treatment of motor-vehicle exhaust gases, the post-treatment device (9, 10) having a normal operating phase in which it traps and accumulates polluting elements from the exhaust gases and a regeneration phase during which these accumulated polluting elements are burnt off so as to regenerate the post-treatment device (9, 10), characterized in that each regeneration phase is divided into a succession of fractional periods (t1-t2), (t2-t3),..., in which the temperature of the exhaust gases entering the post-treatment device is alternately hotter, in a rich period (R), and cooler, in a lean period (P), and in that the duration of the rich (R) and lean (P) periods are determined, respectively, according to the duration of at least one lean period (P) and at least one rich period (R), so that the surplus energy provided in a rich period (R) is compensated for by a lack of energy in a lean period (P) so that the average energy supplied to the post-treatment device (9, 10) enables the temperature at the exit of the post-treatment device (9, 10) to remain close and on average equal to an optimum setpoint temperature (Tsetpoint) for the regeneration phase.