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Design and function
Boost pressure control (BPC)
valve
The boost pressure control (BPC) valve has the task
of preventing the turbocharger (TC) from over-revving
at high engine speeds. The valve is controlled by a
pressure regulator with a sprung diaphragm which is
affected by the boost pressure via a hose from the
compressor housing. When a particular boost pressu-
re is achieved, the boost pressure control (BPC) valve
opens and forces some of the exhaust gases (6) past
the turbo and directly out into the exhaust pipe (5).
Charge air cooler (CAC)
The intake air enters the charge air cooler after com-
pression in the turbo compressor. The sea water coo-
led cooler lowers the temperature of the air and there-
by considerably improves the output ratio as the volu-
me of the air is reduced. More air (oxygen) can there-
fore be forced into the engine's cylinders and burn
more fuel per compression stroke; thus increasing
output.
A turbocharged diesel engine with charge air cooler
(CAC) has the highest efficiency of any internal com-
bustion engine.
Basic diagram of turbocharger with boost pressure
control (BPC) valve
12
1. Air from air filter
2. Compressed air to the engine
3. Compressor housing
4. Turbine housing
5. Exhaust gases outlet
6. Waste gas flow past turbine wheel via boost
pressure control (BPC) valve at high engine load
7. Exhaust gases from engine
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