ENGINE FUEL SYSTEM
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1881-01
5. COMPONENTS OF HIGH PRESSURE TRANSFER LINE
In the high pressure section, sufficient fuel pressure that injectors requires will be generated
and stored. The components are as below:
High pressure pump
Rail pressure sensor
Pressure limit valve
Common rail
High pressure pipe
Injector
Fuel pressure regulating valve (IMV) -
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This is plunger pump that generates high
pressure and driven by crankshaft with
timing chain. The high pressure pump
increases system pressure of fuel to approx.
1,600 bar and this compressed fuel is
transferred to high pressure accumulato
r
(common rail) in tube through high pressure
line.
1) High Pressure Pump
It stores fuel transferred from high pressure
pump and also stores actual high pressure
of fuel. Even though the injectors inject fuel
from the rail, the fuel pressure in the rail is
maintained to a specific value. It is because
the effect of accumulator is increased by
unique elasticity of fuel. Fuel pressure is
measured by rail pressure sensor.
And the fuel pressure regulating valve (IMV,
Inlet Metering Valve) included in high
pressure pump housing keeps pressure to a
desired level.
2) Common Rail
