Input Devices: Generator

Generator output is controlled by PCM based on battery voltage input and ambient temperature. PCM keeps charging system output voltage at 12.9-15.0 volts. Charging system output voltage is controlled by generator voltage regulator (field control), located within PCM. The voltage determined by PCM as final goal for charging system is called "control" voltage. The control voltage will be used to determine generator field control and to detect if charging system is operating properly.

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