EV Battery Charging Time Display With Linear SOC Estimation

The battery capacity is segmented into useful capacity and reserve capacity. The charging process is divided into phases: initial charging using useful capacity with linear SOC increase, and final charging using reserve capacity to maintain linear display. This segmentation allows accurate charging time estimation by treating different capacity portions differently.

The method changes the parameter representation by introducing a virtual linear SOC trajectory that differs from the actual nonlinear charging curve. By adjusting the display parameter (virtual SOC) rather than directly displaying the actual nonlinear SOC, the system achieves linear charging time display while maintaining accurate total time estimation.

A virtual linear SOC trajectory is introduced as an intermediary between the actual nonlinear charging process and the display system. This virtual trajectory serves as a mediator that translates the nonlinear physical charging process into a linear display representation, allowing both high charging speed and accurate display.

Instead of displaying the actual nonlinear SOC directly, the system inverts the approach by creating a virtual linear SOC that increases uniformly over time. The relationship is inverted: rather than SOC determining display, a virtual linear display trajectory is imposed and mapped back to actual charging progress.