24-03-2011, 04:44 PM
PRESENTED BY:-
SK. GAURAV SIDIQUE
som_ppt.pptx (Size: 751.04 KB / Downloads: 129)
INTRODUCTION
Petrol vehicles uses device called carburetor for supplying the air fuel mixture in correct ratio to cylinders in all rpm ranges
In response to recent demands carburetor now must be equipped with various compensating devices, making it more complex system
MPFI (multi point fuel injection) system is used, assuring proper air fuel ratio to the engine by electrically injecting fuel in accordance with various driving conditions
The electronic fuel injection system supplies the combustion chambers with air/fuel mixture of optimized ratio under widely varying driving conditions.
What is MPFI system?
Types of MPFI system?
1. D- MPFI System
2. L-MPFI System
Main components of MPFI system
a)Air intake system
b)Fuel delivery system
c)Electronic control system
Air intake system
a. Throttle body
b. Idle air control valve
. Fuel delivery system
Fuel pump
Pressure regulator system
Injector
Fuel delivery system
Arrangement of fuel deliver
1-Port injection
2- Throttle body injection
. Electronic control system
• Fuel injection control system
• Idle speed control system
• Fuel pump control system,
• Ignition control system,
• Radiator fan control system,
EMISSION CONTROL SYSTEM
Automotive emissions are controlled in three ways;-
1. Promote more complete combustion so that there are less by products
2. Reintroduce excessive hydrocarbons back into the engine for combustion
3. Provide an additional area for oxidation or combustion to occur. This additional area is called a catalytic converter
SENSORS USED IN MPFI.
Manifold absolute pressure (MAP) sensor
Throttle position sensor
Intake air temperature sensor
Engine coolant temperature sensor
Oxygen sensor
Vehicle speed sensor
Camshaft position sensor
Crank shaft position sensor
ADVANTAGES OF MPFI
More uniform A/F mixture will be supplied to each cylinder; hence the difference in power developed in each cylinder is minimum. Vibration from the engine equipped with this system is less, due to this the life of engine components is improved.
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.
Since the engine is controlled by ECM* (Engine Control Module), more accurate amount of A/F mixture will be supplied and as a result complete combustion will take place. This leads to effective utilization of fuel supplied and hence low emission level.
The mileage of the vehicle will be improved.
DISADVANTAGES:-
Higher initial cost due to precise and complicated component assemblies.
Increase the service problems due to system as many wearing parts.
Weight and bulk of MPFI system is more than that of a carburettor.
It generates more noise.
CONCLUSION
Almost all vehicles in India are changing to the MPFI because of law emissions, improved mileage and drivability since the engine is controlled by micro computer more accurate amount of a/f mixture will be supplied and as a result complete combustion will take place. this leads to effective utilization of fuel supplied and hence low emission level. it reduces wastage of fuel by the use of sensors and other control systems
SK. GAURAV SIDIQUE
som_ppt.pptx (Size: 751.04 KB / Downloads: 129)
INTRODUCTION
Petrol vehicles uses device called carburetor for supplying the air fuel mixture in correct ratio to cylinders in all rpm ranges
In response to recent demands carburetor now must be equipped with various compensating devices, making it more complex system
MPFI (multi point fuel injection) system is used, assuring proper air fuel ratio to the engine by electrically injecting fuel in accordance with various driving conditions
The electronic fuel injection system supplies the combustion chambers with air/fuel mixture of optimized ratio under widely varying driving conditions.
What is MPFI system?
Types of MPFI system?
1. D- MPFI System
2. L-MPFI System
Main components of MPFI system
a)Air intake system
b)Fuel delivery system
c)Electronic control system
Air intake system
a. Throttle body
b. Idle air control valve
. Fuel delivery system
Fuel pump
Pressure regulator system
Injector
Fuel delivery system
Arrangement of fuel deliver
1-Port injection
2- Throttle body injection
. Electronic control system
• Fuel injection control system
• Idle speed control system
• Fuel pump control system,
• Ignition control system,
• Radiator fan control system,
EMISSION CONTROL SYSTEM
Automotive emissions are controlled in three ways;-
1. Promote more complete combustion so that there are less by products
2. Reintroduce excessive hydrocarbons back into the engine for combustion
3. Provide an additional area for oxidation or combustion to occur. This additional area is called a catalytic converter
SENSORS USED IN MPFI.
Manifold absolute pressure (MAP) sensor
Throttle position sensor
Intake air temperature sensor
Engine coolant temperature sensor
Oxygen sensor
Vehicle speed sensor
Camshaft position sensor
Crank shaft position sensor
ADVANTAGES OF MPFI
More uniform A/F mixture will be supplied to each cylinder; hence the difference in power developed in each cylinder is minimum. Vibration from the engine equipped with this system is less, due to this the life of engine components is improved.
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.
Since the engine is controlled by ECM* (Engine Control Module), more accurate amount of A/F mixture will be supplied and as a result complete combustion will take place. This leads to effective utilization of fuel supplied and hence low emission level.
The mileage of the vehicle will be improved.
DISADVANTAGES:-
Higher initial cost due to precise and complicated component assemblies.
Increase the service problems due to system as many wearing parts.
Weight and bulk of MPFI system is more than that of a carburettor.
It generates more noise.
CONCLUSION
Almost all vehicles in India are changing to the MPFI because of law emissions, improved mileage and drivability since the engine is controlled by micro computer more accurate amount of a/f mixture will be supplied and as a result complete combustion will take place. this leads to effective utilization of fuel supplied and hence low emission level. it reduces wastage of fuel by the use of sensors and other control systems