TURBOCHARGER
SYSTEM
-
Description TC-3
Turbocharger
Operation of Turbocharger
Waste Gate Valve
Exhaust gas acts on the turbine wheel inside the
turbine housing, causing
it
to revolve. When the
turbine wheel revolves, the impeller wheel which
is
located on the same shaft also revolves, compres-
sing the intake air which has passed through the air
cleaner. When expelled from the compressor hous-
ing the compressed air
is
supplied to the cylinders:
When the engine speed increases, the exhaust gas
volume increases and the turbine wheel revolutions
increase (approx. 20,000
-
1
15,000 rpm), thus the
turbocharged air pressure grows greater and engine
output increases.
If
the turbocharged air pressure exceeds the
prescribed air pressure, the flow of exhaust gas
by-passes the turbine, controlling turbine wheel
revolutions and turbocharged air pressure. This
by-pass valve which controls the quantity of ex-
haust gas flowing to the turbine
is
called the waste
gate valve. When the charged air pressure exceeds
the prescribed pressure, the actuator operates, the
waste gate valve opens and part of the exhaust gas
by-passes the turbine. This causes
a
drop in the
turbine revolution rate and controls the charged air
pressure within the prescribed limits.
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