Power supply system of modern engines

4.12.2.b System sensors

Several sensors are used for controlling the entire system:

• throttle blade position sensor (opening angle);
• crankshaft position and rotation speed sensor;
• camshaft position sensor (also called phase sensor);
• oxygen excess sensor (another name - lambda probe);
• pressure regulator (controls the fuel injection pressure).

Having received data from all these sensors, the ECU sends a signal to the fuel injector, which injects exactly as much fuel as needed at a given time.

Figure 4.51 Example of feed system for gasoline engine with throttle body injection.

Surplus fuel is drained through the return line back to the fuel tank.

Fuel injection is synchronized with the help of ignition distributor.