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The paper mainly described how to estimate the state of battery charge (SOC) on electric vehicle (EV). Having deeply researched the lithium-ion (LiFePO4) battery characteristic, the paper established a kind of new battery equivalent circuit model. Meanwhile the paper improved the traditional EKF SOC estimate algorithm, including add the battery internal resistance as a new state variable, real time...
For the Extended Kalman Filter (EKF) not easy to adjust, difficult to apply on system of updating step time, and its linearization process may generate error of approximation, in recent year, some new methods about expansion Kalman filter to nonlinear system have been proposed. This paper present a new method that Sigma-point Kalman filter estimate SOC through the use of weighted statistical linear...
A dynamic model considering hysteresis effect and polarization effect and based on tests and parameter estimation is proposed to describe the dynamic characteristics of NiMH battery pack on hybrid electric vehicle (HEV) with high precision. With the dynamic model, state-of-charge (SOC) estimation method is derived based on Extended Kalman Filter (EKF). Simulation results over different tests show...
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