2.10. System of injection of fuel of petrol engines
Petrol engines established on Opel cars, are equipped with electronic systems of injection of fuel: the integrated control system of injection for each cylinder and system of ignition (DOHC-I) with consecutive injection. Such system of injection provides highly effective preparation of a toplivovozdushny mix. Each cylinder is equipped with a separate fuel nozzle which sprays fuel directly ahead of the inlet valve of the cylinder.
Principle of an external smeseobrazovaniye: fuel is injected directly ahead of the inlet valve. Getting thus in the combustion chamber the toplivovozdushny mix is homogeneous. Thanks to a close arrangement to each other the inlet valve and a fuel nozzle the mix quickly gets to the combustion chamber. It reduces probability of hit паров gasoline in an inlet collector. Systems of injection of fuel with electronic control differ on different types of engines, but the principle of their work is almost identical. Distinctions are shown generally only in parameters and places of placement of these blocks.
The electric fuel pump forces fuel on a distributive pipe (the fuel distributor) to fuel nozzles. The regulator of pressure supports constant pressure in system and sends unspent fuel back in a fuel tank.
In the electronic control unit the butterfly valve located a butterfly valve which by means of the sensor and the control unit is connected with an accelerator pedal. The pedal is more strongly pressed, the butterfly valve more opens. By full pressing of a pedal the zaslonka opens completely. Here the sensor of a butterfly valve and the valve of stabilization of idling is located. At big loading of the engine idling, at working climatic installation or the electrohydraulic booster of a steering involved at full capacity this gate allows to submit additional amount of air. The electronic control unit the engine distinguishes increase in a stream of air by means of a measuring instrument of amount of soaked-up air and let's team inject more fuel. So idling is stabilized.