Pneumatic wastegate control for an internal combustion engine equipped with an exhaust turbocharger

摘要

In order to reduce the exhaust back pressure produced in a lower load range of an internal combustion engine (1) by the exhaust turbine (5) of an exhaust turbocharger (6), a pressure chamber (19) of a pressure capsule (16) controlling a wastegate (9) is connected by means of a solenoid valve (23) to a vacuum generator (22) driven by the internal combustion engine (1) only when a switch (24) actuated in the lower load range triggers the solenoid valve (23) in the opening direction. <IMAGE>