Turbocharger (G2006271): Operation

WARNING: This page is about a different variant/trim than selected.

The turbocharger is an exhaust-driven centrifugal air compressor which increases power output by supplying compressed air to the engine. The turbine wheel of the turbocharger extracts energy from engine exhaust gases to drive the compressor wheel. The compressor wheel draws in ambient air through the air intake system which is compressed and delivered through a charge air cooler to the throttle body.

By turbocharging the engine, the pressure and density of the air entering the cylinders is increased, and therefore so is the amount of oxygen. This enables a greater quantity of fuel to be injected, thus increasing the engine's power output, improving fuel consumption and the ability to maintain power at higher altitudes.

The fixed vane turbocharger is interconnected by the charge air ducts of the intake air distribution and filtering system. For additional information, refer to: INTAKE AIR DISTRIBUTION AND FILTERING .

The turbocharger cooling and lubrication are achieved using engine oil to allow it to maintain the optimum operating temperature and protect the bearings from overheating. In addition, the fixed vane turbocharger is interconnected with the engine cooling system.

The charge air cooler is used to increase the density of air as it flows from the turbocharger compressor to the intake manifold. Compression of the charge air by the turbocharger raises the temperature of the air. This generation of heat further decreases the charge air density, and consequently less oxygen is able to enter the cylinders, reducing the engines power. To overcome this, the compressed air is routed through the charge air cooler before it enters the engine. The charge air cooler reduces the compressed air temperature by transferring the heat to atmosphere.

The operation of the turbocharger system is controlled by the Powertrain Control Module (PCM). The turbine bypass control actuator controls the pressure of exhaust side of the fixed vane turbocharger. The external compressor bypass valve prevents the compressor surge during tip-out events.