Operation of the petrol engine management system

The electric fuel pump draws fuel from the fuel tank and delivers it through a filter located under the tank to the fuel manifold. The pressure regulator, depending on the engine, maintains the fuel pressure in the system constant and equal to 3 bar.

Electrically controlled valve injectors pulse fuel into the engine intake manifold just before the intake valves. The engine control unit controls the operation of the valve injectors sequentially, i.e. in accordance with the order of operation of the cylinders. The unit regulates the duration of injection and thus the amount of fuel injected.

Engine intake air passes through the air filter and through the throttle valve assembly through the intake manifold to the intake valves. The amount of air entering the engine is controlled by a throttle valve, the position of which is changed using a stepper motor based on commands from the engine control unit.

The engine control unit is located in the engine compartment, on the left rear near the front wall. In this case, we are talking about a small computer with high performance. The control unit calculates the optimal ignition timing, the start of injection and the amount of injected fuel.

Signals from various sensors and directives to actuators ensure optimal engine operation in any driving situation. If important sensors fail, the control unit switches to a backup program to avoid engine damage and to continue driving. In this case, the engine runs unevenly and tends to stall when the accelerator pedal is pressed.