COMMON RAIL INJECTION SYSTEM OUTLINE[MZ-CD 1.6 (Y6)]

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•  The common rail injection system is a pressure accumulator injection system. This means that with this system the fuel pressure is constantly present, whilst on conventional systems (for example with the distributor type fuel injection pump), the fuel pressure always has to be generated for each injection process.
On the common rail injection system, therefore, pressure generation and fuel injection are separated. The injection pressure is, to a great extent, generated irrespective of engine speed and injected fuel quantity and is made available in a common rail ready for injection.
•  Advantages of the common rail injection system are:
―  high injection pressure up to approx. 160 MPa {1,632 kgf/cm2, 23,206 psi}
―  injected fuel quantity, fuel pressure in the high pressure accumulator (rail) and start of injection all matched to the operating conditions
―  variable pilot injection to optimize combustion quality
―  advanced post injection to raise the exhaust gas temperature during the regeneration process of the diesel particulate filter (High power-Euro 4)
―  retarded post injection to raise the exhaust gas temperature during the regeneration process of the diesel particulate filter (High power-Euro 4)
―  low tolerances and high precision over the entire service life.
•  Given the fact that the components of the high‐pressure fuel system are high‐precision machined parts, it is essential that scrupulous cleanliness is observed when carrying out any work on the system.
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1
Fuel injector
2
High‐pressure fuel pipe (fuel injector side)
3
Fuel return hose
4
Fuel metering valve
5
Fuel transfer pump
6
High‐pressure fuel pipe (fuel pump side)
7
Fuel pump
8
Common rail
9
Fuel pressure sensor