Internal-combustion engine operating method, involves arranging catalyst in exhaust duct, operating internal combustion engine with two combustion method and switching between combustion method depending on conversion rate of catalyst

摘要

The method involves arranging a catalyst in an exhaust duct, operating an internal combustion engine with two combustion method. The internal combustion engine is operated with a combustion method in a lean operation. The switching takes place in between the combustion method depending on a conversion rate (15) of the catalyst. The conversion rate of the catalyst is molded in a computation model. The conversion rate of the catalyst is molded for hydrocarbon.