The Engine Control Unit (ECU) controls the EFI (Electronic Fuel Injection) system.
Understanding the ECU's Role in EFI
The ECU acts as the central "brain" of the EFI system. It's responsible for managing fuel delivery to the engine for optimal performance and efficiency.
- The ECU uses data from various sensors throughout the engine and vehicle.
- Based on this sensor data, the ECU calculates the appropriate amount of fuel to inject.
- The ECU also determines the precise timing of the fuel injections.
ECU Inputs and Outputs
The ECU takes in a wide variety of inputs and controls many outputs.
Inputs to the ECU
- Engine speed (RPM)
- Engine temperature
- Airflow
- Throttle position
- Oxygen sensor readings
Outputs from the ECU
- Fuel injector pulse width (how long the injector stays open)
- Ignition timing
- Idle air control valve position
In essence, the ECU uses the sensor inputs to decide when and how much fuel to inject into the engine, controlling the EFI system. According to the reference material: The engine control unit (ECU) is the brain of the system; it uses sensor inputs to determine the necessary amount of fuel and the timing of injections.
