Internal combustion engine i.e. supercharged engine, controlling method, involves taking portion of air in downstream of compressor to control exhaust gas recirculation rate by recirculation of quantity of air around compressor

摘要

The method involves taking a portion of air in downstream of a compressor (4) for injecting the portion of air in upstream of the compressor to control an exhaust gas recirculation (EGR) rate by recirculation of a quantity of air around the compressor. The quantity of the air is adapted based on a law proportional to a difference of driving pressure at terminals of a supercharged engine, or adapted by controlling a degree of opening of a valve e.g. active recirculation valve, in a recirculation duct using an engine control unit (14).