Turbocharger - 2.0L GTDI

Overview 

The turbocharger is an exhaust-driven centrifugal air compressor. Its purpose is to increase power output by supplying compressed air to the engine. The internal components are oil, coolant and air cooled. Engine oil and coolant are circulated through the center housing which acts as a heat barrier between the "hot" turbine and the "cold" compressor. Bearings are sleeve type and lubricated by engine oil. Oil is circulated to the turbocharger center housing and returned to the sump through an oil drain in the center housing.

The EcoBoost turbocharger is connected to the cylinder head. This configuration improves engine responsiveness due to the reduced interia of a small turbocharger. This also leads to an improved turbocharger package and better utilization of heat energy from the compact cylinder head to turbocharger flange. The compact design of the system allows the catalysts to be located very close to the turbocharger outlet for improved emissions.

System Operation 

Expanding exhaust gases drive the turbine shaft assembly to speeds up to 200, 000 rpm. Filtered air entering the compressor side of the turbocharger is compressed and delivered through a CAC. The very hot compressed air is cooled, then continues on to fill the intake manifold at a higher pressure than atmospheric pressure. Because considerably more air is forced into the intake manifold, the results are increased power, fuel efficiency and the ability to maintain power at higher altitudes.

The turbocharger wastegate is designed to be in the open position. The wastegate is commanded to close at the onset of engine run. The wastegate is vacuum actuated.

System Diagram 

Courtesy of FORD MOTOR COMPANY