Cranking Circuit
The cranking circuit consists of the following components, all of which
are connected electrically:
| • | The starter enable relay and related wiring |
| • | The central control module (CCM) |
| • | The theft deterrent system |
Charging
The generator provides voltage in order to operate the vehicle's electrical
system and to charge the battery. A magnetic field is created when current
flows through the rotor. The magnetic field rotates as the engine drives the
rotor. This creates an AC voltage in the stator windings. The AC voltage is
converted to DC by the rectifier bridge and is supplied to the electrical
system at the BAT terminal.
The regulator uses digital techniques in order to supply current to
the rotor and thereby control the output voltage. The rotor current is proportional
to the width of the electrical impulses supplied by the regulator.
When the ignition switch is placed in RUN, voltage is supplied to terminals
L and F. This voltage turns on the regulator. Narrow width pulses are supplied
to the rotor, creating a weak magnetic field. When the engine is started,
the regulator senses generator rotation by detecting AC voltage at the stator
through an internal wire. Once the engine is running, the regulator varies
the field current by controlling the pulse width. This regulates the generator
output voltage for proper battery charging and electrical systems operation.
The digital regulator controls the Check Charging System indicator with
a solid state lamp driver. The lamp driver turns on the indicator whenever
an undervoltage, overvoltage or stopped generator is detected.
