Exhaust-gas turbocharger for loading e.g. diesel engine, has spring unit that is arranged such that prestressing force exerted on continuously adjustable flap has digressive course over pivoting angle based on closed position of flap

摘要

The turbocharger (1) has a pivotably supported and continuously adjustable flap (10) for releasing and closing a by-pass pipeline (9), where the flap is loaded with force by a pre-stressing force, which is produced by a spring unit (12) in a direction of a closed position. The flap is loaded with the force by a control rod (15) actuated using a pressure sensor (17), in a direction of an opened position. The spring unit is arranged such that the prestressing force exerted on the flap has a digressive course over a pivoting angle (alpha) based on the closed position of the flap. An independent claim is also included for a method for controlling exhaust gas amount of a exhaust gas turbocharger.