Common Rail System Configuration

The common rail control system can be broadly divided into the following four areas: sensors, engine ECU, EDU, and
actuators.

Sensors
Detect the condition of the engine and the pump.
Engine ECU
Receives signals from the sensors, calculates the proper injection quantity and injection timing for optimal engine operation, and sends the appropriate signals to the actuators.
EDU
Enables the injectors to be actuated at high speeds. There are also types with charge circuits within the ECU that serve the same role as the EDU. In this case, there is no EDU.
Actuators
Operate to provide optimal injection quantity and injection timing in accordance with the signals received from the engine ECU.

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