Process for reducing the exhaust gas emissions of an internal combustion engine for motor vehicles with catalytic converter

A method for seducing exhaust gas emissions of an internal combustion engine for an automotive vehicle, said combustion engine including an exhaust gas outlet, an exhaust gas conduit and an exhaust gas catalytic converter, which method is characterized by providing, at least at cold start, a ram pressure condition in said exhaust gas conduit to generate a pressure increase of more than 0.5 bar at the exhaust gas outlet of the engine, and by additionally loading the engine at rapid load and speed changes, and by controlling said ram pressure condition such that ram pressure is relatively high when said combustion engine is under low load conditions, and ram pressure is relatively low when said combustion engine is under heavy load conditions.