Thursday, June 14, 2012

Distributed Supervisory Controller Design for Battery Swapping Modularity in Plug-In Hybrid Electric vehicles

Abstract: A distributed supervisory controller is proposed to achieve battery component swapping modularity (CSM) for a plug-in hybrid electric vehicle (PHEV). The CSM permits the designer to distribute a part of the supervisory controller to the battery module such that the PHEV can use a range of batteries while providing corresponding optimal fuel economy. A novel feedback-based controller for the charge sustaining mode is proposed to facilitate distributed controller design for battery CSM. The method based on sensitivity analysis of the control signals with respect to the battery hardware parameter is introduced to define the controller distribution architecture. The distributed controller gains are obtained by solving a bilevel optimization problem using the collaborative optimization and the augmented Lagrangian decomposition methods. The simulation results demonstrate that the proposed distributed controller can achieve battery CSM without compromising fuel economy compared to the centralized control case.

Impact: The battery module (including battery controller) can be swapped (e.g., upgraded or used to handle product variants) without having to redesign and retune the supervisory controller for the PHEV power management.

Journal: ASME Journal of Dynamic Systems, Measurement and Control, July 2012. DOI: 10.1115/1.4006214.

Submitted by A. Galip Ulsoy, the C D Mote, Jr Distinguished University Professor of Mechanical Engineering and Professor of Mechanical Engineering, College of Engineering. ulsoy@umich.edu

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