40
Engine Management
Quick-start functions
Camshaft position sensor G40 and G163
As with the V6-5V engines, the new
V8-5V engines also have two sensors for
determining the position of the camshaft
(G40 and G163).
The sender system with “quick-start rotor
ring“ already used in the 4- cylinder 5-valve
engines is implemented.
The quick-start rotor ring has two wide and
two narrow stops (two small and two large
windows).
If a stop is in the Hall sensor, the level at the
signal output sensor is high.
By using different stop widths, it is possible
to use the signal from G40 together with the
engine speed sender G28 to determine the
camshaft position relative to the crankshaft
more quickly.
SSP217_053
When the engine is started, the engine control
unit can thus determine the ignition TDC of the
next cylinder more quickly so that the engine
starts more quickly (synchronisation with the
1st cylinder is no longer necessary). This is
referred to as quick-start synchronisation or
the quick-start function.
5 V/Div. 10 ms/Div
SSP217_062
Signal trace for engine speed sender G28 and Hall sender
G40 using oscilloscope function of VAS 5051
G40
G28
Sender wheel
Software reference mark
66
o
before TDC of 1st cylinder
TDC of 1st cylinder
Automatic mode
*