This document covers the recommended practices associated with reporting the vehicle’s (hybrid and pure electric) battery pack performance details to the automobile user. Specifically, performance details refer to the amount of stored energy available for use by the vehicle’s hybrid or pure electric drive system. These practices detail the accuracies, error conditions and other reporting and diagnostic requirements responsible for delivering an accurate assessment of the amount of available electrochemical fuel.
Rationale: The performance and safety of hybrid and pure electric vehicles is highly dependent on the accurate and immediate assessment of the amount of electrochemical fuel available for use by the vehicle at any time. The range, fuel economy and other critical, calculated performance criteria rely greatly on the fuel gauge details. Consequently, having a clearly defined fuel gauge performance requirement will ultimately improve both vehicle safety and customer satisfaction.