Exhaust gas cleaning system for internal combustion engine has first and second fuel delivery arrangements for delivering additional fuel to first and second NOx storage/reduction catalyzer systems

摘要

The internal combustion engine has an upstream first NOx storage/reduction catalyzer system (1) and a downstream second NOx storage/reduction catalyzer system (2) arranged in sequence in the internal combustion engine exhaust system, a first fuel delivery arrangement (4) for delivering additional fuel to the first NOx storage/reduction catalyzer system and a second fuel delivery arrangement for delivering additional fuel to the second NOx storage/reduction catalyzer system.