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Common rail injection
Advantages of the new injection technology
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.
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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 –
Injection quantity
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.
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