190204b Eletronically Controlled Fuel Injerion Systems Flashcards
Before the solenoid is energized the fuel is?
Directed back into the fuel supply
What happens when the solenoid is energized?
The fuel is prevented from escaping the injector
What does the ECM do when the throttle is depressed to full throttle?
Increases the pulse width being sent to the injector
What does the iapcv (injector actuation pressure control valve) do?
Maintains the correct oil pressure in the HEUI system
What causes the delay in a HEUI. System?
The grove in the intensifyer piston allows the needle to close do to a lose in pressure
HPCR. Full pressure is?
The fuel pressure to each injector is the same
How much fuel pressure remains in the common rail after shut down
1000psi
How is the flow limiting valve controlled in a HPCR system
Flow rate
In a HPCR injector, the injection process only occurs when?
The solenoid is energized relieving the pressure on top of the plunder allowing it to lift
What traps fuel in a EUP system
The solenoid
Where is the injection pump located in a EUP system?
Directly on top of the cam
EUI/MEUI are actuated?
Mechanically
Purpose of the fuel transfer pump
To supply injectors with clean cool de airated fuel at the right pressure
The 5 stages of HEUI injection
Pre injection Pilot injection Delay period Main injection End of injection
What keeps the needle closed in a HEUI System
A spring and the transfer fuel pressure e
