Injectors engine operation-10-

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Injectors




The electromagnetically controlled injectors dose and atomize the fuel. The quantity of injected fuel is regulated by the duration of actuation of the fuel injectors. The fuel injectors are either closed (not actuated) or opened (actuated). Each cylinder has its own injector. The injection is accurately dosed and takes place at a time determined by the PCM. Injection takes place immediately in front of the intake valves of the cylinder.


1---Electrical connection
2---Seal
3---Fuel inlet with fine sieve
4---Housing
5---Coil
6---Spring
7---Valve needle with solenoid armature
8---Valve seat with nozzle hole disk
The fuel injectors consist of a housing with fuel passages, a coil and an injector needle with a solenoid armature. The fuel inlet in the injector features a fine sieve. The injectors are controlled via end-stages integrated into the PCM with the signal calculated by the engine management system on the earth side. Power is supplied via the Powertrain Control Module relay and fuse F9 in the BJB. The injected fuel quantity depends on the opening time, the fuel pressure and the diameter of the nozzle holes. There are two holes in the nozzle hole disk. These are arranged so that two jets of fuel emerge. Each jet supplies one intake valve.

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