Alternator Output

The engine controller keeps charging system voltage at 13.4-15.0 volts. Charging system voltage will be adjusted by engine controller based on battery temperature sensor, located within engine controller housing. The voltage determined by engine controller as final goal for charging system is called "control" voltage. The control voltage will be used to determine alternator field control and to detect if charging system is operating properly.

If sensed voltage is lower than "control" voltage, engine controller will alter duty cycle and ground alternator (rotor) field for a longer period of time and create a higher alternator output which should raise sensed voltage level. If sensed voltage is higher than "control" voltage, engine controller will alter duty cycle and lower alternator output which should lower sensed voltage level.