FUEL INJECTION

ECU- Electronic control unit? The ECU is like the brain of the engine it sends and receives messages of what the motor is doing, it controls and monitors the rest of the minor sensors, changing things like air flow and fuel mixtures to make the engine run to the ideal specifications.


Mass air flow sensor? It monitors how much air is entering the system then sends the message to the ECU so the amount of fuel to air mixture is right

Air Temp sensor? This is a very important sensor in the (car) because depending on the density/temp of the air the amount of fuel has to be changed because otherwise the fuel mix might be to lean or to rich - Hot, light air, less fuel needed. Cold, dense air, more fuel needed. If the motor is running wrong mixtures you might end up fouling the spark plug, consuming to much petrol or have a lack in power.

TPS throttle position sensor? This is located on the butterfly shaft and sends the ECU info about the position so it can monitor how much fuel to be injected etc

Throttle body? To control the amount of air taken into the engine.

Temp sensor? Tells us when the engine is cold and hot


fuel rail? The fuel rail is mounted next to the injectors and its purpose is to deliver equally pressurised fuel to the injectors.


Fuel pressure regulator? Is to maintain a constant fuel pressure above the intake manifold pressure.

Injectors? Injectors spray a mist of fuel into the cylinder


Idle air control? The idle air control is to change the engine idle RPM by opening and closing an air bypass channel inside the throttle body.

O2 sensor ( lambda sensor)? Measures the amount of oxygen is being used in the engine, which the determines if the engine runs lean or rich.

Map sensor? The map sensor reads the manifolds constant and instant pressure so it can determine the air density which is then sent to the ECU.


Plenum chamber? The plenum chamber is to equalise pressure entering the motor for more even distribution. A plenum chamber can also work as a silencer device.


Camshaft & Crankshaft sensor? These sensors tell the ECU where the shaft is in its rotation, this then determines when the fuel is delivered and when the spark is set.

Who invented fuel injection and when? The inventor of fuel injection was Herbert Akroyd Stuart in 1885.

Explain how an single and multi injection system works? Single - is a petrol injection point where the fuel and air is mixed by one centraly positioned injector. the injector is mounted on the throttle body and injects the fuel on top of the throttle to be sucked into the boar.

Multi - Uses one injector for each piston. the injectors are mounted on the intake manifold and inject the fuel into the top of the boar.

What does EFI stand for? Electric fuel injection

REFERENCES
http://ricardodemacedoengineer.blogspot.com/
www.wikipedia.com