General information about the fuel injection system (Opel Corsa C)

Petrol engines installed in Opel cars are equipped with electronic fuel injection systems: integrated injection control system for each cylinder and ignition system (DOHC-I) with sequential injection. Such an injection system provides highly efficient preparation of the fuel-air mixture. Each cylinder is equipped with a separate fuel injector, which sprays fuel directly in front of the cylinder intake valve.

The principle of external mixture formation: the fuel is injected directly before the intake valve. The fuel-air mixture entering the combustion chamber in this way is homogeneous. Due to the close location of the intake valve and fuel injector, the mixture quickly enters the combustion chamber. This reduces the likelihood of gasoline vapor entering the intake manifold. Electronically controlled fuel injection systems differ in different engine types, but their operating principle is almost the same. The differences are mainly manifested only in the parameters and locations of these units.

An electric fuel pump forces fuel through the fuel rail (fuel distributor) to the fuel injectors. The pressure regulator maintains constant pressure in the system and sends unused fuel back to the fuel tank.

The electronic throttle control unit contains the throttle valve, which is connected to the accelerator pedal via a sensor and a control unit. The harder the pedal is pressed, the more the throttle valve opens. When the pedal is fully pressed, the valve opens completely. The throttle valve sensor and the idle speed stabilization valve are also located here. When the engine is heavily loaded at idle, with the air conditioning system running, or the electric power steering is engaged at full power, this valve allows additional air to be supplied. The electronic engine control unit recognizes the increase in air flow using the intake air flow meter and gives the command to inject more fuel. This stabilizes the idle speed.

The source is on the online website [www.opelbook.ru]