BLOW-OFF DEVICE FOR CHARGED INTERNAL COMBUSTION ENGINES, WITH A BLOW-OFF VALVE ARRANGED ON THE AIR SIDE

摘要

A relief device comprises a charging air relief valve of the type of a diaphragm or piston valve which is moved into an open position by means of the dynamic action of the outflowing charging air. This control method is too slow with a charging pressure which is critical for the internal combustion engine and results in an excessively low charging pressure reduction. For the rapid charging pressure reduction with a charging air relief valve of small design, the said valve is combined with an auxiliary device which moves the charging air relief valve into a maximum open position starting from a predetermined dynamic opening stroke by means of a static operating variable and holds it there for a desired time.