"Latest Injection System replacing the previous method to achieve Excellence in I C Engine also To Reduce Losses..."

2. Petrol vehicles uses device called carburetor for supplying
the air fuel mixture in correct ratio to cylinders in all rpm
ranges. However in response to recent demands for cleaner
exhaust emission, more economical fuel consumption, etc., the
carburetor now must be equipped with various compensating
devices, making it more complex system. So In place of the
carburetor, therefore, the 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.

4. This system has three major components they are
a) Air intake system
b) b) Fuel delivery system
c) c) Electronic control system

5. The air (corresponding to the throttle valve opening)
is filtered by the air cleaner, passes through the
throttle body, and is distributed by the intake manifold
and finally drawn into each combustion chamber.
When the lAC valve is opened according to the signal
from ECU

6. The fuel in the fuel tank is pumped and filtered by fuel
filter and fed under pressure to each injector through
the delivery pipe. As the fuel pressure applied to the
injector is always kept a certain amount higher than
the pressure in the intake manifold by the fuel
pressure regulator, the fuel is injected into the intake
port of the cylinder head when the injector opens
according to the injection signal form ECM.

7. The electronic control system consist of various
sensors which detect the state of engine and driving
conditions,
The sensors such as
Intake air temperature sensor
Engine coolant temperature sensor
Oxygen sensor
Vehicle speed sensor

8. Batched system
Simultaneous system
sequential system

9. Batched system:
Here the fuel is injected to the cylinders in groups,
without precisely bringing together to any particular
cylinder’s intake stroke.
Simultaneous system:
Here at which fuel is injected at the same time to all
the cylinders.
sequential system:
In this kind injection is timed to coincide with each
cylinder’s intake stroke.

10. More uniform air-fuel mixture will be supplied to each cylinder
The vibrations produced in MPFI engines is very less, due to
this life of the engine component is increased.
No need to crank the engine twice or thrice in case of cold
starting as happen in the carburetor system.
Immediate response, in case of sudden acceleration and
deceleration.
The mileage of the vehicle is improved.

11. Almost all vehicles in India are changing to the mpfi
because of low 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 it reduces pollution