Here’s a breakdown of the differences between an electronic fuel injection (EFI) test bench and a common rail test bench:
Different Operating Principles
Common rail fuel injection technology forms a constant high-pressure fuel flow, which is then distributed to each injector. Using high-speed electromagnetic solenoid valves integrated into each injector, the system controls the timing and quantity of fuel injected into the diesel engine’s combustion chamber with precision.
On the other hand, EFI systems in the Fuel Actuation Interface (FAI) are powered by an active nozzle. This active nozzle converts electrical energy directly into mechanical energy, which is then used to spray and atomize the fuel. The FAI nozzle works based on a PWM (Pulse Width Modulation) signal.
Different Features
Common rail systems employ advanced electronic control devices and high-speed solenoid valves, delivering fuel via the common rail system.
EFI systems have integrated pump nozzles, eliminating the need for a separate fuel pump in the fuel tank to compress fuel. They also don’t require high-pressure fuel pipes (fuel rails), as all connections to the fuel tank use low-pressure fuel lines.
Different Advantages
Common rail systems ensure optimal combustion, excellent atomization, precise ignition timing, sufficient ignition energy, and reduced emissions.
EFI engines feature functions such as cold start enrichment and automatic fast idle during cold conditions, ensuring smooth engine start-up, whether the engine is cold or hot.
