Method and system for controlling the active regeneration of a particle filter

The method involves determining a set point temperature of gas, and determining a temperature request for controlling the temperature. A stationary gain is defined as ratio between a stationary value of a variation and a stationary value of a hydrocarbon mass flow rate variation. A control law for a hydrocarbon flow rate is defined at an inlet of an oxidation catalyst (15) through ratio of temperature demand and a corrected gain. The hydrocarbon flow rate is modified by applying the control law. An independent claim is also included for an internal-combustion engine comprising an exhaust gas treatment system.