17-07-2012, 02:13 PM
COMMON RAIL FUEL INJECTION SYSTEM
COMMON RAIL FUEL INJECTION .ppt (Size: 2.17 MB / Downloads: 122)
Common rail fuel injection system and its function
Provide the diesel engine with fuel
Generate the high pressure needed for fuel injection and distribute the fuel to the
individual cylinders
Inject precisely correct amount of fuel at
exactly the right moment in time.
In contrast to other injection system Common
rail fuel injection system is an accumulator injection system.
Low –pressure circuit
The low –pressure circuit is responsible for transporting the fuel to the high –pressure circuit
The Common Rail Sub functions
High –pressure circuit comprises:
High – pressure pump with pressure – control valve
The high – pressure accumulator (Rail )with the rail –pressure sensor
Injectors, and
The respective high – pressure connection lines.
COMMON RAIL FUEL INJECTION SYSTEM
PRE SUPPLY PUMP
Transports fuel from the fuel tank to the high pressure pump.
An electric fuel pump is used for this purpose in the CRFIS.
When the electric fuel pump is switched off, the supply of fuel is interrupted and the engine stops.
PRE SUPPLY PUMP
Gear type fuel pump
The drive gear wheel is driven by the engine .
Delivery quantity is directly proportional to engine speed .
Shut off is by means of an electromagnet