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8/9/2019 Petrol Fuel Injection
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FUEL INJECTION
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Fuel Injection•Limitation of carburetor/Necessityof fuel injection
• In Multi cylinder engine – difficult for a single
carburetor to supply uniform quality and quantity.• Venturi throat of the carburetor causes a restrictionin the passage of air flow to the engine. If the throatis made a larger for this reason, the problem of
suitable mixture supply• Carburetor has many wearing parts, After wear itsoperates less efficiency.
• Loss of volumetric efficiency due to flow of mixturein choke tube, inlet pipe bends.
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Merits of Fuel Injection• Absence of Venturi – No Restriction in Air Flow/Higher
Vol. E./Torque/Power• Mnifol! "rnch Pi#es Not concerne! with Mi$ture
Pre#rtion %MP&'
• "etter Accelertion Res#onse %MP&'
• Fuel Ato(i)tion *enerll+ &(#ro,e!
• -se of ensors to Monitor #erting Pr(eters/*i,esAccurte Mtching of Air/fuel Require(ents0 &(#ro,esPower1 Re!uces fuel consu(#tion n! E(issions
• Precise in Metering Fuel in Ports
• Precise Fuel 2istribution "etween 3+lin!ers %MP&'
• Fuel Trns#orttion in Mnifol! not require! %MP&' so no4ll 4etting
• Fuel urge 2uring Fst 3ornering or He,+ "r5ingEli(inte!
•
A!#tble n! uitble For u#erchrging %P& n! MP&'
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TYPE OF INJECTION SYSTEM
• Direct injectionsystem
Direct injection
forces fuel into the enginecombustion chambers.Diesel injection systems
are direct type
• Indirect injectionsystem
An indirect injection
system sprays fuel into the
engine intake manifold.Most
gasoline injection
systems are of this
type.
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Also 3lle! Mnifol! &n6ection or
ingle Point &n6ection %P&' orThrottle "o!+ &n6ection %T"&'
The point or location of fuelinjection is one way toclassify a gasoline injectionsystem.
A single-point injectionsystem, also call throttlebody injection (TBI), hasthe injector nozzles in a
throttle body assembly ontop of the engine. Fuel issprayed into the top center ofthe intake manifold
Mono point injection (or) Single pointinjection (or) Throttle body injection (TBI)
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u pon nec on or Port fuel injection (PFI)
• A multi-Point injectionsystem, also called portinjection, has an injectorin the port (air-fuel
passage) going to eachcylinder. Gasoline issprayed into each intakeport and toward each
intake valve. Thereby, theterm multipoint (morethan one location) fuelinjection is used
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FUEL INJECTION TYPES
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MECHANICAL (CAM) CONTROLLEDGASOLINE INJECTION SYSTEM
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ELECTRONICALLY CONTROLLEDGASOLINE INJECTION SYSTEM
• The supply of fuel and timing are controlled by Electronic is known as Electroniccontrolled gasoline injection system.
• This mainly used for Spark ignition system(SI) Engine.
• It Consists of four units.
1. Fuel delivery system 2. Air induction system
3. Sensors and Air flow control system
4. Electronics control units (ECU)
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ELECTRONICALLY CONTROLLEDGASOLINE INJECTION SYSTEM
8/9/2019 Petrol Fuel Injection
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ELECTRONICALLY CONTROLLEDGASOLINE INJECTION SYSTEM
8/9/2019 Petrol Fuel Injection
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ELECTRONICALLY CONTROLLEDGASOLINE INJECTION SYSTEM
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Fuel circuit components
Common rail and Pressure sensoFuel line hoses
Fuel filtersFuel pumps
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Automotive Engineering
MECHANICAL FUEL PUMP
&N7ET VA7VE
2&APHRA*MPR&N*
2&APHRA*M
2E7&VER8VA7VE
2rin Hole
Acts as a breather fordiaphragm, but is alsoa tell-tale hole - fuelwill leak out of it if thediaphragm splits. Oilwill leak out if the
piston rod seal fails.
P-77 R2EA7
F-E7 &N F-E7 -T
E33ENTR&3 N3AMHAFT
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Automotive Engineering
Electric Fuel Pumps - Low Pressure
3ontct "re5er Points
Mgnet 3oil
Return #ring
utlet Vl,e
utlet 3onnection
Electricl u##l+ 3onnection Pushro!
@ Mgnet Ar(ture
2i#hrg( Asse(bl+
9B &nlet Vl,e
99 &nlet 3onnection
9: Filter
9 :
;
<=
9:
99
9B
@?
>
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FUEL INJECTOR
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Controlling Parameters to Sense(Some of the Parameters)
1.Engine Speed
2.Amount of Inlet Air (Engine Load)
3.Throttle Position
4.Air Temperature5.Coolant Temperature
6.Altitude
7.Cranking Speed
8.Exhaust Oxygen Concentration
9.Battery Voltage