Bosch MS 6 - Ignition Timing and Control Parameters

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Bosch Motorsport Engine_Control_Unit_MS_6.x_Manual 37/76
4.1.9 Main Data Labels for Ignition
Main Data Labels for ignition
Notice: Positive values stand for ignition angles before TDC, negative values after TDC. Be-
gin with moderate values to protect your engine from damages.
MP_TDWELL Coil dwell time. Consult the coil manufacturer
for details. Most coils need dwell times about
1.5 to 2.5 ms at 12 to 14 V. For further back-
ground information please refer to the Function
Description IGNITION.
DIGN_CYL1-…12 Cylinder individual corrections. Set to 0.0. Num-
bering refers to mechanical cylinders.
MP_IGN_START/DIGN_ST_TINT Base spark advance during engine start. Set to 5
to 10 deg, according to the requirements of the
engine.
MP_IGN(2/3) Base ignition timing in deg crankshaft before
TDC. Use modest values at the first time. Atmo-
spheric engines may run safe at 20 to 25 deg in
part load, turbo engines at high boosts may de-
mand even less spark advance. These values are
strongly dependant on compression ratio, fuel
quality, temperature and engine specifics. If you
know you’re using “poor” fuel, run at high tem-
peratures or your engine is very sensitive on
spark advance, go to the safe side.
MP_DIGN_TEMP/MP_DIGN_TEMPW Ignition angle temperature dependent
DIGN_APPL Delta value for spark advance, use for applica-
tion work. Start at 0.0 for first startup.
IGN_IDLE_STAT Ignition timing during idle. 10 deg are suitable
for most applications
NIDLE_NOM / DIGN_IDLECTRL Desired engine idle speed for idle stabilization.
Set value to desired speed or deactivate stabiliz-
ation by setting DIGN_IDLECTRL to 0.0.
4.1.10 Main Data Labels for Engine Speed Limitation
The rev limiter works in two steps:
– Soft limitation by ignition retardation or cylinder individual cutoff of injection and/or
ignition
– Hard limitation by injection cut off and/or ignition cutoff of all cylinders
To achieve a good dynamic behavior by advanced intervention, the engine speed is pre-
dicted by means of the speed gradient.