14 SECTION 1 - GENERAL SPECIFICATIONS F2B CURSOR EURO 4 ENGINES TURBOCHARGING The turbocharging system consists of: - air filter; - a variable geometry or a fixed geometry turbocharger; - “intercooler” radiator.
Figure 18 Engine exhaust gas Intake air Compressed air (hot) Compressed air (cooled) 44916 DIAGRAM OF SUPERCHARGING WITH THE VGT TURBOCHARGER VGT TURBOCHARGER The movement of the device, choking the exhaust gas flowing Base - September 2006 Print P1D32C002 E Operating principle 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. Thanks to this solution, gas velocity and turbine speed can be high even when the engine is idling.
If the gas is made to go through a narrow passage, in fact, it flows faster, so that the turbine rotates more quickly. section, is carried out by a mechanism, activated by a pneumatic actuator. This actuator is directly controlled by the electronic control unit by a proportional solenoid valve. 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. A toroidal chamber is obtained during the casting process in the central body for the passage of the coolant.