Method for reducing the polluting emissions of a hybrid drive device

A method for reducing the polluting emissions of a spark-ignition internal combustion engine associated with at least one electric machine capable of operating at least in a generator mode, capable of driving at least one driving wheel of a motor vehicle via a system for transmitting a driving torque of the vehicle,

• wherein said method comprises:
• a stage of changing a gear of a gearbox of said transmission system to a higher gear, said gear change stage comprising a prior stage of detecting a command to change said gear by the higher gear and a stage of engaging said higher gear corresponding to the end of the gear change;
• a stage of engine adjustment carried out after the detection of said change command and comprising a fuel injection stage and a fuel ignition stage with a predetermined ignition advance that maximizes a thermal torque produced by the engine;
• a stage of controlling said electric machine carried out concomitantly with the stage of adjusting the motor, said electric machine operating according to a generator mode which generates a resisting torque throughout the duration of the gear change.