170
WSG-1068 IGNITION SYSTEM
Starting Mode
Module enters start mode at first application of power.
No spark is applied for first turn of crankshaft. Timing is
fixed at 10 degrees BTDC. Dwell is fixed at 10 degrees
of crankshaft rotation. Start mode remains in effect until
10 turns of the crankshaft @ 500 rpm. If drops below
500 rpm at any time, turn counter is reset. Once 10 turns
are made @ 100 rpm or greater, module is set to run
mode. In transitioning to run mode, calculated timing
values are ramped into system during approximately 3.5
revolutions to ensure transition. Dwell is determined with
a base value plus a correction factor based on system
voltage.
CHT Effects
Cylinder Head Temperature (CHT) is monitored and a
correction factor is applied to engine timing based on
one of three 1 X 8 tables. OCT1 selects which timing
table will be used for correction.
IAT Effects (Not Used)
Intake Air Temperature (IAT) is monitored and a
correction factor is applied to engine timing based on
one of three 1 X 8 tables. OCT1 selects which timing
table will be used for correction.
Overspeed Protection
The GCP module contains an RPM limit that is set at
3200 RPM. Reaction is the module will be shut off,
stalling the engine. Key must cycle from run to off to start
in order to restart engine. Note: this strategy must be
compatible with governor controllers.
Engine Protection
Reaction for overtemp (based on CHT input) and low oil
pressure (based on oil pressure switch input) the module
will be shut off, stalling the engine. Key must cycle from
run to off to start in order to restart engine. Engine
protection becomes active after 240 crankshaft
revolutions and when 800 rpm is exceeded. The purpose
of having to meet these conditions provides an
opportunity for the engine to restart if the failure still
exists which caused the engine to stall. Over
temperature reaction is experienced when temperature
reaches 250°F. Low oil pressure reaction is experienced
when oil pressure drops below 6 psi +/- 1.5 psi. Oil
pressure switch position is normally open when engine is
off.
Starter Lockout
Starter lockout relay control open drain (GCP switch to
ground). Activated once engine is in the run mode and
has reached 600 RPM. Will not allow start until ignition
voltage to GCP module is switched off and back on.
Tachometer Output
Tachometer output will be from Pin #2 of the 42 pin
harness. The pulses per revolution will be determined by
the number of cylinders the GCP will control. The four
cylinder GCP will output 2 pulses per revolution, the six
cylinder GCP output 3 pulses per revolution, the eight
cylinder output 4 pulses per revolution, and the ten
cylinder 5 pulses per revolution. The intention of this is to
allow for use of a conventional tachometer from this
output.
Global Control Platform (GCP)
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