In the field of new energy electric vehicles, ultracapacitor modules are often used as energy storage batteries. Precise estimation of state of charge (SOC) of ultracapacitor modules is critical to the secure operation of vehicle power supply. In this paper, equivalent circuit models and SOC estimation algorithms are compared and analyzed. The forgetting factor recursive least squares (FFRLS) is employed to supply precise equal circuit model parameters for SOC estimation algorithm. On this basis, an improved Sage-Husa adaptive unscented Kalman filter (IAUKF) online SOC estimation algorithm is ...
