Art for the desired production of ammonia in a three-way catalytic converter for a system for passive selective catalytic reduction

摘要

A drive train comprises an internal combustion engine with a plurality of cylinders and a post treatment system, including a device for selective catalytic reduction, the ammonia used as a reducing agent. An ammonia production cycle comprises the operation of a portion of the cylinder with an air / fuel - ratio, which is conducive to, in order to generate molecular hydrogen, and a proportion of the cylinder with an air / fuel - ratio, which is conducive to, in order to produce the nox. Between the motor and of the device for selective catalytic reduction, a ammonia generation catalyst is used, in order to produce ammonia.