Battery voltage optimization of a variable DC bus voltage control powertrain for medium duty delivery trucks for various drive cycles

Najmabadi, Ali; Humphries, Kieran; Boulet, Benoît; Rahman, Tanvir

doi:10.1109/itec.2016.7520259

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…(1) Top-down cascade control system structure, to facilitate direct saturation of current demands via power converter references [39]; (2) Bottom-up control system design wherein the current control systems for the battery and ultracapacitor ESS are designed and tested first, which is then followed by the comprehensive design of the superimposed feedback control levels [40]; (3) A direct or indirect load compensator should augment the feedback controllers to deal with potentially abrupt loads at the EV DC bus side [41,42]; (4) Variable DC bus voltage target, which is characteristic for hybrid-EVs [43,44] and those with fully electrified power-trains [45], and may also be beneficial to useful life extension of capacitors within the inverter DC bus [46]; (5) Use of control system design methodology which could facilitate straightforward tuning of the closed-loop control system response dynamics; (6) Simplicity of code implementation that would enable use on robust microcontroller platforms suitable for automotive applications.…”

Section: Introductionmentioning

confidence: 99%

Damping Optimum-Based Design of Control Strategy Suitable for Battery/Ultracapacitor Electric Vehicles

et al. 2018

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This contribution outlines the design of electric vehicle direct-current (DC) bus control system supplied by a battery/ultracapacitor hybrid energy storage system, and its coordination with the fully electrified vehicle driveline control system. The control strategy features an upper-level DC bus voltage feedback controller and a direct load compensator for stiff tracking of variable (speed-dependent) voltage target. The inner control level, comprising dedicated battery and ultracapacitor current controllers, is commanded by an intermediate-level control scheme which dynamically distributes the upper-level current command between the ultracapacitor and the battery energy storage systems. The feedback control system is designed and analytical expressions for feedback controller parameters are obtained by using the damping optimum criterion. The proposed methodology is verified by means of simulations and experimentally for different realistic operating regimes, including electric vehicle DC bus load step change, hybrid energy storage system charging/discharging, and electric vehicle driveline subject to New European Driving Cycle (NEDC), Urban Driving Dynamometer Schedule (UDDS), New York Certification Cycle (NYCC) and California Unified Cycle (LA92), as well as for abrupt acceleration/deceleration regimes.

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