Principles of Operation

PRINCIPLES OF OPERATION







The powertrain control module (PCM) controlled charging system determines the optimal voltage setpoint for the charging system and communicates this information to the voltage regulator. This system is unique in that it has 2 unidirectional communication lines between the PCM and the generator/regulator. Both of these communication lines are pulse-width modulated (PWM). The generator communication (GEN COM) line communicates the desired setpoint from the PCM to the voltage regulator. The generator monitor (GEN MON) line communicates the generator load and error conditions to the PCM. The third pin on the voltage regulator, the A circuit pin, is a dedicated battery voltage sense line.

Circuit Description

Positive Battery Output (B+) Terminal Circuit 2037 (RD)
The generator output voltage is supplied to the battery and electrical system through the positive battery output (B+) terminal circuit 2037 (RD) on the rear of the generator.

A Circuit 35 (OG/LB)
The A circuit or battery sense circuit is used to sense battery voltage. This voltage is used by the regulator to determine generator output. This circuit is also used to supply current to the generator field (rotor). The amount of current supplied to the rotor determines generator output.

Circuit 1817 (YE)
The generator monitor (GEN MON) circuit communicates the generator load and error conditions to the powertrain control module (PCM).

Circuit 1816 (YE/LB)
This is the generator communication (GEN COM) circuit. The PCM determines the optimal voltage setpoint for the charging system and communicates this information to the voltage regulator on the GEN COM circuit.