Theory Of Operation

Courtesy of CHRYSLER GROUP, LLC

The Alternator contains an Intelligent Voltage Regulator that controls the Alternator overall operation. It communicates with the Powertrain Control Module (PCM) by means of a LIN BUS communication interface. Unlike traditional regulators, containing a fixed set of parameters and a defined strategy, the Intelligent Voltage Regulator allows changes to these parameters based on messages sent by the PCM. In the event of a fault or loss of communication, the Intelligent Voltage Regulator uses a default set of parameters to allow a recovery solution that allows the Alternator to continue charging without inputs from the PCM.

• The PCM sends the following messages/requests to the regulator: 
  • Intelligent Voltage Regulator wake-up signal
  • Charge rate
  • Mechanical load
  • Maximum current output based on operating and environmental conditions
• The regulator sends the following information/faults regarding diagnostic and Alternator load conditions to the PCM: 
  • Alternator duty cycle
  • Measured energizing current
  • Over temperature error
  • Mechanical error
  • Electrical error
  • Communication error
  • Time-out error