Method for reducing pollutant of the exhaust gas of a multi-cylinder internal combustion engine

摘要

The exhaust emission reduction system uses a catalyser inserted in the exhaust line, with the air/fuel ratio for the engine cylinders adjusted to provide a lambda value of approx. 1 for the engine exhaust gases from all cylinders. At least one of the engine cylinders is operated with a weak fuel mixture, the remaining engine cylinders operated with a rich fuel mixture. Pref. the engine cylinders are operated with a weak fuel mixture and a rich fuel mixture in alternation, with the distribution of the cylinders operated with the weak fuel mixture and the rich fuel mixture determined by the engine operating characteristics.