Turbocharger - Vehicles With INGENIUM I4 2.0L Diesel 240PS Engine

WARNING: This page is about a different car, the 2018 Jaguar XE and 2017 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.

The exhaust gas emitted from the cylinder head flows into the exhaust manifold first. Distribution of the exhaust gas between the High Pressure (HP) turbocharger and the Low Pressure (LP) turbocharger is controlled by the Turbine Bypass Valve (TBV). The operation of the TBV is based on engine speed and controlled by the Powertrain Control Module (PCM).

Below 1500 RPM, when the exhaust gas flow rate is low, the TBV remains completely closed. The entire exhaust gas flow is diverted into the HP turbocharger. Boost pressure is controlled by varying the Variable Geometry Turbine (VGT) actuator, this results in a very quick and high boost pressure rise.

The exhaust gas flow that exits the HP turbocharger is passed over the LP turbocharger. This provides sufficient gas flow to start the LP turbocharger, which becomes primed to deliver boost pressure without any lag.

As the engine speed increases between 1500 and 2800 RPM, the flow capacity of the high pressure stage is increasing as the HP turbocharger is opened. As the maximum capacity is exceeded, the HP turbocharger TBV is partially opened. This allows more from the exhaust gas to bypass the HP turbocharger into the LP turbocharger.

At high engine speeds and loads the majority of the exhaust gas is bypassed around the HP turbocharger into the LP turbocharger through the TBV. The TBV automatically opens as the LP stage boost pressure exceeds the boost pressure of the high pressure stage. The completely open TBV allows the full flow of exhaust gas through the LP turbocharger, generating maximum power output.

At maximum engine speeds and loads the LP turbocharger speed is limited by bypassing exhaust gas around the LP turbocharger. At this stage the total boost pressure is regulated by the LP turbocharger wastegate valve.

The air intake to the LP turbocharger receives air from the Exhaust Gas Recirculation (EGR) system. For additional information, refer to: Engine Emission Control - INGENIUM I4 2.0L Diesel .

The intake air is drawn through the LP turbocharger and then passed onto the HP turbocharger.

As the engine speed rises, more intake air is getting compressed by the LP turbocharger and supplied onto the HP turbocharger, which compresses the air further. This increases the boost pressure and charge air density.

At maximum engine speed the increased air pressure opens the passive Compressor Bypass Valve (CBV), which prevents air recirculation through the LP turbocharger and is allowing more air flow.