Whenever KL15 is activated the IBS updates the DME with the current closed circuit histogram/battery status information, by way of the BSD. The stored information/snap-shot data is overwritten every 6 hours. The current SoC/battery data is stored in the IBS every 2 hours over a 6 hour time frame, providing 3-2 hour snapshots of battery SoC information. Software contained in the microprocessor of the IBS utilizes the measured values to calculate the State of Charge (SoC) of the battery during vehicle sleep mode and compares this information with that received from the DME/ECM pertaining to the battery SoC/SoH, during the period of time between engine “OFF” and deactivation of the DME main relay. The values are forwarded to the DME to calculate the SoH of the battery. Internal resistance of the battery is calculated by the IBS from the current and voltage dip during engine start. SoH helps the DME determine the proper charging rates and anticipated battery life. Charge/dis-charge cycles and times are monitored.
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