Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Electronic Fuel & Emission's > Electronically Controlled Fuel Injection Systems > Flashcards

Electronically Controlled Fuel Injection Systems Flashcards

1
Q

What is the purpose of the ECM cooling plate?

A

Allow fuel to flow through the ECM and cool it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the purpose of the fuel transfer system?

A

Supply the electronically controlled injector with clean, cooled, de-aerated fuel at the correct pressure and temperature

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Electronic Unit injectors

A

Pressure built by the camshaft rocker pushing down on the top of injector. The ECM then decides how long to open the injector, and when it needs to be opened.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

the three main sensors monitored to control EUI injection processes are?

A

Throttle position
Intake manifold pressure
Engine speed and timing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

EUI injection process is broken down into what for stages?

A

Pre-injection
Injection
End of injection
Fill

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

EUI pre injection

A

The cam lobe starts to force the fuel injector plunger downward, the solenoid is de-energized, poppet valve is open and fuel is forced out of injector by the plunger into the fuel supply passage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

EUI injection

A

Solenoid is energized, poppet valve closed, nozzle opens at around 4500 PSI, fuel is injected. S

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

EUI end of injection

A

Solenoid is de-energized and poppet valve opens by spring pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

EUI fill

A

The injector plunger moves upward and the injector is filled with transfer pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Calibration code number

A

Identifies fuel delivery variations that exist between each fuel injector

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

HEUI system operation is dependent on the interaction between what sub-systems?

A

Electronic control
Fuel transfer
Hydraulic actuation
HEUI injectors

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

HUEI injectors

A

Are hydraulically actuated to create injection pressure and deliver fuel to each of engines combustion chambers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

HUEI hydraulic actuation pressure varies from?

A

870 - 3500 PSI

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

HUEI actuation pressure is controlled by what?

A

Injection actuation pressure control valve, ECM, And the injection actuation pressure sensor.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is size ratio of intensifier piston?

A

Top is 6-7 times larger then plunger

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

HUEI injection operation consists of what 5 stages?

A 
Pre-injection
pilot injection
delay period
main injection
end of injection
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

The HPCR system consists of what components?

A 
High pressure pump
Rail pressure control valve
Rail pressure sensor
Common fuel rail
Pressure limiting valves
High pressure lines
Injectors
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

HPCR high pressure pump builds pressure of what?

A

Module says 4000 - 26000 PSI

19
Q

HPCR pressure limiting valve will open if rail pressure reaches what?

A

2000 - 3000 PSI over the normal operating pressure

20
Q

What is the purpose of a flow limiting valve?

A

Shut off fuel flow to the injector when it exceeds about 1.5 times the normal flow rate

21
Q

Energizing the solenoid in a HPCR injector creates what?

A

A pressure differential in the injector that allows the high pressure pushing up to over come the spring and low pressure on top of intermediate valve, the nozzle opens and fuel enters combustion chamber

22
Q

Electronic unit injector are actuated by?

A

A mechanical injector drive mechanism

23
Q

What is the purpose of the poppet valve in the electronic unit injector?

A

Controls fuel flow through the injector to begin and end injection

24
Q

The amount of fuel injected by an electronic unit injector is typically expressed as pulse width. Pulse width can be measured in?

A

Degrees of crankshaft rotation
Percentage of fuel
mm of fuel

25
Q

A HUEI fuel injection system involves a high pressure engine oil hydraulic system and a _____ pressure diesel fuel system.

A

Low

26
Q

HEUI injectors are controlled by the ECM to determine?

A

BOI
EOI
Fuel metering

27
Q

What are the 5 stages of the HEUI fuel injection process?

A 
Pre-injection
Pilot injection
Delay period
Main injection
End of injection
28
Q

To begin the injection process in a HEUI injector, the poppet valve must be _________ by the injector solenoid

A

Opened

29
Q

T/F The HEUI fuel injector is filled with diesel fuel during the end of injection stage?

A

True

30
Q

What component does the high pressure oil act on inside of the HEUI injector?

A

Intensifier piston assembly

31
Q

The HPCR fuel system utilizes a radial piston pump that provides high pressure:

A

Fuel for the injection process

32
Q

In a HPRC fuel injector, what keeps the injector needle valve closed between injections?

A

A spring and the high pressure fuel on top the intermediate valve

33
Q

What the purpose of using the extremely high pressure that are found in the HPCR system.

A

Better atomization of the fuel

34
Q

What is the purpose of a pilot injection?

A

Pilot injection develops a flame front in the cylinder before the main fuel charge is injected which helps reduce overall engine noise and emissions

35
Q

What are the main components of the EUP fuel system(6)?

A 
Engine control unit
Vehicle control unit
Sensors, switches and wiring
Fuel transfer system
Camshaft actuated electronic pumps
Injection lines and nozzles
36
Q

To begin injection, the EUP solenoid is energized and this _____ the poppet valve:

A

Closes

37
Q

What component does the high pressure oil act on inside act on inside the HEUI injector

A

The intensifier piston assembly

38
Q

T/F In a HPCR system, when the engine is shutdown, there will be no pressure in the common rail and the injection lines?

A

False. In most systems there will be about 1000 PSI residual pressure

39
Q

T/F In the HPCR fuel system, to begin the injection process, the injector control valve must be opened.

A

True

40
Q

In a HPCR fuel injector, what keeps the injector needle valve closed between injections?

A

A spring and the high pressure fuel on top of the intermediate valve

41
Q

What is fuel pressure during HEUI pilot injection?

A

About 4500 PSI

42
Q

on a system with a multi-plunger injection pump, the fuel injection nozzles atomize and distribute the fuel in the combustion chamber. What type of injection nozzle is this?

A

hydraulic nozzle

43
Q

What does “TRAMP” mean in a fuel system.

A 
T = timing
R = rate
A = atomization
M = metering
P = penetration
44
Q

electronic unit type injectors are actuated by?

A

mechanical drive mecanism

Electronic Fuel & Emission's (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions