Common rail injection Combustion Advantages of the new injection technology Injection quantity The advantages gained with the new technology include a larger available injection volume as well as particularly fine and rapid metering of injection quan tities due to finely tuned switching times. In combina tion with direct actuation of the piezo injectors by the CDI control unit, the fuel injection process can be even more precisely adjusted to the respective load and rpm situation. This is achieved, for example, through precise multiple injections which enable fuel consumption, combustion noise and exhaust emis sions to be reduced even further.
The engine also runs significantly more smoothly at idle. The injection timing point and injection period are determined by the following factors: Direct actuation of piezoceramic element Opening / closing speed of the nozzle needle Needle lift Nozzle geometry with 7-hole nozzle module Engine load Torque request i Note When working on the injection system (e.g. piezo injector, pressure lines, rail, high-pressure pump) particular care must be given to quality and clean- liness, as even the most minor contamination may very quickly lead to complaints about engine running characteristics and damage.
22 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 –