access icon free State-of-charge and state-of-health estimation with state constraints and current sensor bias correction for electrified powertrain vehicle batteries

Pragmatic approaches are proposed to enhance battery state estimation using Kalman filter (KF) and extended KF. Notable novelties introduced include: the use of state/parameter constraints, asymmetric equivalent circuit model behaviour, inclusion of nominal models, and current sensor measurement bias estimation and compensation. The so-called delta parameters are estimated to handle cell variations, aging, and online deviation of parameters. Strategic simplifications that enable the use of traditional KF algorithm are described. Unique filter structures are presented for state-of-charge and state-of-health estimation, the latter focuses on capacity and impedance estimation. The performance of the proposed approaches is demonstrated on experimental drive-cycle data designed for electric vehicle (EV) and hybrid EV applications.

Inspec keywords: Kalman filters; hybrid electric vehicles; power transmission (mechanical); electric current measurement; ageing; nonlinear filters; battery powered vehicles; electric sensing devices

Other keywords: impedance estimation; online parameter deviation; extended KF; current sensor measurement bias estimation; Kalman filter; delta parameter estimation; state-of-charge estimation; electrified powertrain vehicle batteries; current sensor measurement bias compensation; parameter constraint; filter structure; asymmetric equivalent circuit model behaviour; state constraint; current sensor bias correction; nominal model inclusion; state-of-health estimation; experimental drive-cycle data; cell aging; pragmatic approach; hybrid EV application

Subjects: Transportation; Current measurement; Filtering methods in signal processing; Mechanical drives and transmissions; Sensing devices and transducers

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