1. MULTI POINT FUEL INJECTION

2. SLIDE PLAN INTRODUCTION COMPONENTS OF MPFI AIR INTAKE SYSTEM
PRESSURE REGULATOR SYSTEM
CONTROL SYSTEM
FUEL PUMP CONTROL SYSTEM
WORKING
FUNCTIONAL DIVISIONS OF MPFI SYSTEM
ADVANTAGE AND DISADVANTAGE
CONCLUSION

3. INTRODUCTION
In petrol vehicles carburetor is used for supplying air fuel mixture to the cylinder
In response to the recent demand for cleaner exhaust emission improved drivability and mileage carburetor is not sufficient
In place of the carburetor MPFI system is used in vehicles
MPFI system is injects fuel into individual cylinders based on commands from engine control module
The MPFI gives higher output, faster throttle response under varying driving conditions

4. Components of MPFI The system has four major components they are
1.Air intake system
2.Fuel delivery system
3.Electronic control system
4.Emission control system
Air intake system
It includes air filter, throttle body, intake manifold, and finally drawn into the combustion chamber

5. Air intake system Fuel delivery system Fuel pump Throttle body
It consist of throttle valve, T P sensor, which detect the throttle valve opening
Idle air control valve which supplies bypass air depending on the engine condition
Fuel delivery system
It includes fuel pump, fuel filter and injector
Fuel pump
ECM controls its operation and centrifugal pump is used to pump the fuel
The fuel pump also has a check valve to keep some pressure in fuel feed line even when fuel pump is stopped

6. Pressure regulator system
It keep the fuel pressure applied to the injector 2.9kg/cm^2
Injector
Each cylinder have one injector
It inject the fuel into the inlet manifold according to the signal from ECM
Electronic control system
The electronic control system consist of various sensors which detect the state of engine and driving conditions

7. Control systems Fuel injection control system
In which ECM controls the timing of fuel injection according to the signals from various sensors
Injection time is calculated on the basis of engine speed
Idle speed control system
It keep the engine idle speed as specified at all times

8. Fuel pump control system
ECM controls the ON\OFF operation of the fuel pump
Ignition control system
This system controls ignition timing
The ECM judges the engine conditions by using signals from various sensors selects suitable ignition timing
Controls of this system includes
Ignition timing at the engine start
Ignition timing after engine start

9. Working

10. The MPFI system consists of one fuel injector placed near every intake valve and directed towards it, in the fuel intake manifold. Fuel is supplied to the injector through a common rail. The amount of air intake is decided by the car driver by pressing the gas pedal, depending on the speed requirement.

11. The air mass flow sensor near throttle valve and the oxygen sensor in the exhaust sends signal to ECU. ECU determines the air fuel ratio required ,hence the pulse width. Depending on the signal from ECU the injectors inject fuel right into the intake valve. The fuel sprayed at high pressure gets atomized into fine particles and get mixed with air. The air fuel mixture is sucked into the engine cylinder and the combustion takes place.

12. FUNCTIONAL DIVISIONS OF MPFI SYSTEM
The mpfi system can be functionally divided into the following three main components
1. Electronic control unit
2. Fuel system
3. Air induction system

13. Advantage of M. P. F. I.
No need to crank the engine twice or thrice in case of cold starting as happens in the carburetor system.
Immediate response, in case of sudden acceleration / deceleration.
The mileage of the vehicle will be improved

14. Disadvantage of M. P. F. I.
Manifold Heat control System OR Valve is Required.
Intake Manifold control only air not Fuel.

15. CONCLUSION
The multi cylinder engines used distributors. But very shortly MPFI system replaced the distributors. The modern day cars use MPFI engines ,which has electronic control in it. They use the engine sensors, integrated chips to monitor the fuel injection time and quantity The multipoint fuel injection are also used in the engines which use LP gas as the fuel, with very less alterations in the gasoline run engine.

16. THANK YOU