Functions
GF07.00>W>3001H
Determination of the engine speed and crankshaft angle, function
2.8.11
ENGINE 471.9 in MODEL 963
W07.16
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1065
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82
1
Flywheel
2
Groove
A4
Engine management control unit (MCM)
B600
Crankshaft position sensor
The engine speed and the crankshaft angle are taken at the
flywheel (1). To do this there are 58 grooves (2) around the
circumference of the flywheel (1) located 6∞ apart around the
circumference, except for a gap of 18∞.
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With the aid of the 18∞ gap which is located between the
groove 63∞ before top dead center (TDC) and the groove 45∞
before top dead center (TDC) for cylinders 1 and 6, the top dead
center of cylinders 1 and 6 or the angular position of the
crankshaft can be recognized.
Each groove (2) triggers an impulse in the crankshaft position
sensor (B600). As soon as the engine management (MCM) control
unit (A4) receives an impulse from the crankshaft position sensor
(B600) its starts an internal counter (trigger). Calculations yield the
crankshaft position and the engine speed.
Calculation of intermediate values makes it possible for the
engine management (MCM) control unit (A4) to accurately
determine the start of injection and the period of injection to
within a fraction of a degree.
Component description for engine
management (MCM) control unit
Component description for crankshaft
position sensor
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Introduction of engine OM 471 and exhaust aftertreatment
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09/2011
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53
– This printout will not be recorded by the update service. Status: 09 / 2011 –
