Common rail injection Combustion Piezo injectors An important component of the new Common Rail technology are the piezo injectors, which are an entirely new development. The injector needle is actu ated directly by a piezo-ceramic actuator, instead of being moved by a hydraulic support system. Compared to a conventional fuel injector, the piezo injector injects fuel into the combustion chamber more rapidly, with better atomization and with greater precision. A special feature of this system is that the piezo injec tors open upon a voltage rise and not upon a voltage drop.
Piezo injector a Warning Due to the risk of engine damage , no connections on the injection system may be disconnected while the engine is running. The injector coupling may not be disconnected and switched to ground while the engine is running because this would trigger an injection. a Warning! Risk of death! During engine operation, a high voltage of up to 250 V is applied to the piezo injectors. 21 Introduction of New Generation of 4-Cylinder Inline Engines, OM 651 q – This printout will not be recorded by the update service. Status: 09 / 2008 –