112 F2B ENGINE T RAKKER E URO 4/5 5424 TURBOCHARGING The turbocharging system consists of: - air filter; - A turbocharger with fixed geometry (330CV and 360CV engines) or with variable geometry (310CV engines); - kintercoolery radiator. Figure 222 Engine exhaust gas Intake air Compressed air (hot) Compressed air (cooled) 44916 DIAGRAM OF SUPERCHARGING WITH THE VGT TURBOCHARGER VGT TURBOCHARGER Operating principle The movement of the device, choking the exhaust gas flowing section, is carried out by a mechanism, activated by a pneumatic actuator.
The variable geometry turbocharger (VGT) consists of a centrifugal compressor and a turbine, equipped with a mobile device which adjusts the speed by changing the area of the passing section of exhaust gases to the turbine. This actuator is directly controlled by the electronic control unit by a proportional solenoid valve. Thanks to this solution, gas velocity and turbine speed can be high even when the engine is idling. The device is in maximum closing condition at idle speed. At high engine operating speed, the electronic control system is activated and increases the passing section, in order to allow the in-coming gases to flow without increasing their speed.
If the gas is made to go through a narrow passage, in fact, it flows faster, so that the turbine rotates more quickly. A toroidal chamber is obtained during the casting process in the central body for the passage of the coolant. Base q November 2006 Print 603.93.641