Mpfi engine
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Transcript of Mpfi engine
WELCOME
P.A.C.RAMASAMY RAJA POLYTECHNIC COLLEGE
DEPARTMENT OF MECHANICAL ENGINEERING
MULTI POINT FUEL INJECTION SYSTEM (MPFI)
PRESENT BYG.MATHANKUMAR
FINAL YEAR MECHANICAL
INTRODUCTION To Supply a proper Ratio of Air+fuel mixture to Cylinder.
Without usage of Carburetor to mixing the Fuel and air In SI Engine.
Varied the Piston speed using Advanced sensors (ECU).
CLASSIFICATION OF MPFI By the Placing of the injector it is further classified
into two types.I. Port Injection system .II. Throttle Injection system
Port Type system:The Injector is Placed in the Intake Manifold near
the intake Port .The Injector Sprays fuel into the Air inside the
manifold .Fuel & Air mix in Uniform manner And this mixture
Entered into Cylinder .
Throttle Injection systemThis is similar to carburetor Body with throttle
valve controlling the amount of Air entering intake manifold .
The sensor is used to control the fuel mixing level.
Type Of Injection System
Sketch of MPFI:
8 &12 Cylinder MPFI
The system has four major components they are
1. Air intake system2. Fuel delivery system3. Electronic control system[E.C.U]4. Emission control system
COMPONENTS OF MPFI
1. Air intake system
2.Fuel delivery system
Fuel return
Fuel rail
1. Electronic control system[E.C.U]
1.THROTTLE POSITION SENSOR: Throttle valve opening degree to send the
signal in E.c.uLocation: it is mount on throttle body
SENSORS:
[MAP] SENSOR: Sensors used in MPFI Manifold absolute
pressure sensor This sensor senses pressure change in the intake manifold The signals from the MAP is used by the ECU to control fuel injection pressure Throttle position.
LOCATION: it is mount on intake manifold
MANIFOLD ABSOLUTE PRESSURE SENSOR
Engine coolant temperature sensor It is incorporated with coolant and measures the coolant temperature.
LOCATION: it is mount on thermostate valve.
ENGINE COOLANT TEMPERATURE SENSOR
INTAKE AIR TEMPERATURE SENSORThe temperature air entering the
engine So find air+fuel mixture.LOCATION: it is mount on air cleaner
To indicate the vehicle speed sensor sense to send the signal.
LOCATION: it is mount on Tramission system
VEHICLE SPEED SENSOR
Senses the amount of oxygen in the engine exhaust and calculates air –fuel ratio. sensor output voltage changes in proportion to air –fuel ratio.
LOCATION: it is mount on exhaust manifold
OXYGEN SENSOR [O2 SESORS]:
Advantages of MPFI:I. Without using of carburetor the
product cost is Low.II. Engine Efficiency is High. III.Low Maintenance.IV.High Power to Engine.V. Emission is control. VI.Easy staring for cold condition.
LIMITATIONS Of MPFI:
1. Cost is high.2. Electrical system is more3. Valve is Required.4. Intake Manifold control only air not Fuel .
THANK YOU