OPERATION
The injector opera tion ca n be subdivided into four
operat ing states with the engine r unning a nd the
high-pressure pump generating pr essure:
• Injector closed (with high pressu re applied)
• Injector opens (start of injection )
• Injector opened fu lly
• Injector closes (end of injection)
Injector closed (with high pressure applied)
With the injector closed (at -rest state), the solenoid
valve is n ot energized and is therefore closed. With
the bleed orifice closed, th e valve sprin g forces the
armatur e’s ball onto the bleed-orifice seat . Th e r ail’s
high pr essu re build up in the valve control cha mber,
and th e sa me pressure is also present in the nozzle’s
chamber volum e. Th e ra il pressur e applied a t th e
control plunger’s end fa ce, together with the force of
the nozzle spring, ma int ain the nozzle in the closed
Fig. 10 FUEL INJECTOR
1 - FUEL INJECTOR
2 - NOZZLE
3 - FUEL INLET FITTING
4 - ELECTRICAL CONNECTION
Fig. 11 INJECTOR COMPONENTS
1 - INJECTOR CLOSED (AT-REST STATUS)
2 - ELECTRICAL CONNECTION
3 - TRIGGERING ELEMENT (SOLENOID VALVE)
4 - FUEL INLET (HIGH PRESSURE) FROM THE RAIL
5 - VALVE BALL
6 - BLEED ORIFICE
7 - FEED ORIFICE
8 - VALVE CONTROL CHAMBER
9 - VALVE CONTROL PLUNGER
10 - FEED PASSAGE TO THE NOZZLE
11 - NOZZLE NEEDLE
14 - 36 FUEL INJECTION VA
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