1A-392 Engine Control System (4HK1)
Turbocharger Description
Legend
1. Exhaust gas
2. VNT actuator & sensor
3. Turbine wheel
4. Compressor wheel
5. Air cleaner
6. Charge air cooler
7. Nozzles
The turbocharger is used to increase the amount of air
that enters the engine cylinders. This allows a
proportional increase of fuel to be injected into the
cylinders, resulting in increased power output, more
complete combustion of fuel, and increased cooling of
the cylinder heads, pistons, valves, and exhaust gas.
This cooling effect helps extend engine life.
Heat energy and pressures in the engine exhaust gas
are utilized to drive the turbine. Exhaust gas is directed
to the turbine housing. The turbine housing acts as a
nozzle to direct the shaft wheel assembly. Since the
compressor wheel is attached directly to the shaft, the
compressor wheel rotates at the same speed as the
turbine wheel. Clean air from the air cleaner is drawn
into the compressor housing and wheel. The air is
compressed and delivered through a crossover pipe to
the engine air intake manifold, then into the cylinders.
Legend
1. VNT actuator & sensor
2. Nozzle
3. Turbine wheel
LNW76ESH003001
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LNW76ELH000201
AB
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LG4HKED-WE-0871.book 392 ページ ２００７年１１月２９日 木曜日 午後６時２９分
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