Theory Of Operation - Smart Charging Strategy

Vehicles that utilize the Smart Charging control strategy are equipped with an Intelligent Battery Sensor (IBS). The Smart Charging strategy can be used with any combination of the following configurations:

• Single Battery system.
• Dual Battery system.
• Electronic Voltage Regulation (EVR) Charging systems using a standard Alternator directly controlled by the PCM.
• Charging systems using a Smart Alternator communicating with the PCM via LIN Bus.

The Smart Charging control functions differently than the traditional EVR systems that do not utilize an IBS. The IBS is an important component for proper function of the Smart Charging control strategy. When the IBS is reporting little to no electrical load on the Battery, particularly at idle, it is common for the PCM to suspend charging, reducing the load on the engine. This in turn helps with emissions and fuel economy. Because of this strategy it is not uncommon for the voltage at the Alternator stud to be equal to, or close to Battery voltage at idle.