Hello.
The project went through several phases.
The first phase was the collecting information about EFI=electronic fuel injection system. If I had to explain in two words what would come out is something like this: EFI is a system which controls the gas and air mixture needed in combustion engines! Basically EFI replaces the old carburetor, and is a much more complex.
EFI system is composed of several main elements:
- ECU - central computing unit => is a computer which controls the engine.
- Sensors => temperature, pressure, position of the acceleration (TPS), speed, oxygen, etc. ...
- Throttle Body , injectors and air controlling system
- Injection pump
The flow control:
Computer (ECU) read sensors, analyze the values and sends an electrical rectangular impulse to the injectors. Duration and time of the impulse is based on sensors data entry and tables from ECU memory. There are two broad categories of EFI systems:
a) "Alpha-N" uses as input the acceleration position (TPS) and engine speed to calculate the amount of fuel injected. The system is designed for sports competitions.
b) "Speed Density" use as entry data from MAP (manifold absolute pressure) sensor and engine speed. MAP is a pressure sensor (the value returned is proportional to the difference between atmospheric pressure and intake pressure) on which is calculated the amount of air that enters in engine. This system it is recommended for public roads.
Both categories can be with "closed loop" or "open loop" according to the presence / absence of oxygen sensor which monitors exhaust emissions. Also the temperature sensor is needed.
All these information are available on the net. I just summarize what I understood.
