1. Carburetor:
- A carburetor is a mechanical device that mixes air and fuel before it enters the engine's cylinders.
- It draws fuel from the fuel tank, mixes it with air, and delivers the mixture to the engine's intake manifold.
- Carburetors were commonly used in older vehicles but have largely been replaced by fuel injection systems due to their limitations, such as imprecise fuel delivery and emission control challenges.
2. Port Fuel Injection (PFI):
- PFI systems inject fuel directly into the intake ports of the engine, close to the intake valves.
- Each cylinder has its own injector, which is controlled by the engine's electronic control unit (ECU) based on various engine operating conditions.
- PFI systems offer precise fuel delivery and better control over fuel injection timing, resulting in enhanced fuel efficiency and emission reduction compared to carburetors.
3. Direct Fuel Injection (DFI):
- DFI systems inject fuel directly into the combustion chamber of the engine, eliminating the need for intake port injectors.
- This design allows for greater control over the fuel injection process, enabling advanced fuel strategies such as multiple injections per cycle and stratified charge, which can further improve fuel efficiency and reduce emissions.
- DFI systems are often found in modern high-performance and fuel-efficient engines.
Each fuel system has its own advantages and disadvantages, and the type of fuel system used in a vehicle depends on factors such as engine design, efficiency, emission regulations, and cost considerations.
