Functional Description of EGM
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Status September 2003 (EvoBus-Service / AFT)
Page: 24 of 83
2.2.1.10
Engine protection: oil pressure
With the engine protection function oil pressure it is currently possible to display a two-stage warning
concept. The engine protection function is calculated every 10 ms in the engine-on mode with insufficient
oil pressure, and in the other states ("Engine stopped", Start") the function is reset.
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Blocking time after Start operation
As the oil pressure may at first be built up with a delay following engine starting, the oil pressure
engine protection function can be blocked for a period of 10 seconds after start operation (transition
from engine state "Start" to "Normal operation"). The function remains reset, i.e. no oil pressure
warnings are output.
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Oil pressure warnings
Depending on the speed, two characteristic curves are available with which the respective minimum
permissible oil pressure can be described.
If the oil pressure drops below the threshold value from the pre-warning characteristic curve, the oil
pressure pre-warning is transmitted. If the oil pressure drops below the threshold value from the
warning characteristic curve, the oil pressure pre-warning is cancelled and the oil-pressure warning is
transmitted via the CAN.
Engine protection: oil pressure pre-warning threshold
MTS - Oil-pressure pre-warning threshold
Oil pressure threshold [bar] = f(Speed [rpm])
P o
il M
IN
Speed
