Engines installed on Renault Megan 2 cars are equipped with an electronic engine management system with distributed fuel injection

This system ensures that the latest emissions and fumes regulations are met while maintaining high driving performance and low fuel consumption.

The control device in the system is the electronic control unit (ECU).

Based on the information received from the sensors, the ECU calculates the parameters for fuel injection control and ignition timing control.

In addition, in accordance with the embedded algorithm, the ECU controls the operation of the electric motor of the fan of the engine cooling system and the electromagnetic clutch for turning on the air conditioning compressor, performs the function of self-diagnostics of the system elements and notifies the driver of any malfunctions.

If individual sensors and actuators fail, the ECU turns on emergency modes that ensure engine performance.

The amount of fuel supplied by the injectors is determined by the duration of the electrical signal from the ECU.

The electronic unit monitors data on the state of the engine, calculates the need for fuel and determines the required duration of fuel supply by the injectors (signal duration).

To increase the amount of fuel supplied, the duration of the signal increases, and to decrease the amount of fuel, it decreases.

Below are diagrams of engine control systems

Scheme of the K4J and K4M engine control system in Figure 1.

Scheme of the F4R engine control system in Figure 2.

Scheme of the K9K engine control system in Figure 3.