Control Seminar

Battery Health Management for Electric Vehicles

Bhashar SahaDr. and Senior Chief Principal EngineerNASA Ames Research Center

Electric vehicles have become the new face of green transportation. With electric UAVs we are witnessing the dawn of a new era in aviation. However, like ground vehicles, battery powered electric UAVs suffer from uncertainties in estimating the remaining charge and hence most flight plans are highly conservative in nature. This talk presents a novel battery health management system based on a Particle Filter driven prognostic framework. The aim is to be able to predict the end-of-discharge event that indicates that the battery pack has run out of charge for any given flight. One of the key motivating factors for using Particle Filters for prognostics is the ability to include model parameters as part of the state vector to be estimated. This performs model adaptation in conjunction with state tracking, and thus, produces a tuned model that can used for long term predictions. This feature of particle filters works in most part due to the fact that they are not subject to the "curse of dimensionality" , i.e. the exponential growth of computational complexity with state dimension. However, in practice, this property holds for "well-designed" particle filters only as dimensionality increases. This talk explores the notion of wellness of design in the context of predicting remaining useful battery life for typical UAV flights. These techniques are applicable to other electric vehicles as well.
Dr. Bhaskar Saha is one of the leading researchers in the area of System Health Management. He is currently a Research Scientist with Mission Critical Technologies, Inc. working at the Prognostics Center of Excellence, NASA Ames Research Center. His research is focused on applying various classification, regression and state estimation techniques for predicting remaining useful life of systems and their components, as well as developing hardware-in-the-loop testbeds and prognostic metrics to evaluate their performance.

Dr. Saha received his Ph.D. from the School of Electrical and Computer Engineering at Georgia Institute of Technology, Atlanta, GA, USA in 2008. He received his M.S. also from the same school and his B. Tech. degree from the Department of Electrical Engineering, Indian Institute of Technology, Kharagpur, India. He has been an IEEE member since 2008 and has published several papers on these topics. He has also been awarded two Best Paper awards at international conferences on Prognostics and Health Management.

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