METHOD FOR ACTUATING AN ACCUMULATOR CATALYST FOR NITROGEN DIOXIDE ON AN INTERNAL COMBUSTION ENGINE FOR A VEHICLE, IN PARTICULAR A CAR

A first range of operation for an accumulator catalyst in a vehicle is carried out in a poor operating mode when the engine is supplied with a lean mixture and nitrogen oxide contained in the exhaust gas is stored in the accumulator catalyst for nitrogen dioxide. In order to remove nitrogen dioxide from said accumulator catalyst for nitrogen dioxide at a determined switching moment when a given switching condition is achieved, an engine control unit switches the poor-operating mode into a rich operating mode.