Charging pressure control

The charging pressure is regulated by the Digital Motor Electronics (DME) via the wastegate valve on the twin-scroll exhaust turbocharger. The pressure converter produces a defined vacuum by converting the signals from the Digital Motor Electronics (DME) in order to adjust the wastegate valve steplessly.

A blow-off valve is flange-mounted to the twin-scroll exhaust turbocharger. This blow-off valve can establish a connection between the intake and pressure side by activating the Digital Motor Electronics (DME) directly. Undesirable charging pressure peaks that may arise when the throttle valve is closed are dissipated via the blow-off valve. If the throttle valve is closed, a pressure wave builds up between the throttle valve and the twin-scroll exhaust turbocharger. This pressure wave can result in a higher load on the bearings of the turbine shaft.

The compressor bypass valve serves the following purposes:

• Improved engine acoustic properties
• Protection for the twin-scroll turbocharger.

The charging pressure is regulated by the Digital Motor Electronics (DME) with reference to a maximum pressure of 0.8 bar via a wastegate valve. Some of the exhaust gases bypass the twin-scroll exhaust turbocharger via the wastegate valve. The wastegate valve is adjusted pneumatically by a diaphragm box. The wastegate valve can be set variably. A pressure converter applies a partial vacuum to the diaphragm box. The Digital Motor Electronics (DME) controls the pressure converter.