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Multi-Objective Optimal Design of Parallel Plug-In Hybrid Powertrain Configurations with Respect to Fuel Consumption and Driving Performance

SAE International Journal of Alternative Powertrains

IAV Automotive Engineering GmbH-Thomas Juergen Boehme, Matthias Rothschuh, Benjamin Frank, Matthias Schultalbers
University of Rostock-Markus Schori, Torsten Jeinsch
  • Journal Article
  • 2014-01-1158
Published 2014-04-01 by SAE International in United States
In the past decade, various Plug-in Hybrid Electric Vehicles have been demonstrated which offer the potential of a significant reduction in fuel consumption and emission. However, this capability strongly depends on the sizing of the components, driver's usage profile and the quality of the energy management. These challenges require new optimization procedures for a systematical exploration of the design space with the objective of an optimal powertrain configuration. A novel optimization strategy based on a multi-objective problem formulation is proposed. The optimization procedure consists of a multi-objective genetic algorithm for determining the best design parameters with respect to fuel consumption and driving performance. The approach is combined with an analytical optimal control problem to find the optimal continuous and discrete control trajectories for the energy management.
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Solutions of Hybrid Energy-Optimal Control for Model-based Calibrations of HEV Powertrains

IAV Automotive Engineering-Thomas Juergen Boehme, Benjamin Frank, Matthias Schultalbers
University of Rostock-Markus Schori, Bernhard Lampe
Published 2013-04-08 by SAE International in United States
In this paper optimal control problems for hybrid powertrain vehicles with different drive-modes are considered and solved using numerical techniques. This leads to the formulation of hybrid optimal control problems. The aim is to find optimal controls and optimal switchings between the drive-modes to minimize a cost function resembling fuel consumption. The problem is nonlinear and subject to constraints concerning both controls and state. The techniques include indirect methods as well as direct optimization methods. Efficiency and accuracy are evaluated for all methods using simulation studies. An experimental test on a near mass-production vehicle confirms the usability of the direct optimization approach.
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Timber Utility Pole Fracture Mechanics Due to Non-Deformable and Deformable Moving Barrier Impacts

SAE International Journal of Passenger Cars - Mechanical Systems

Exponent Inc.-Jeffrey Croteau, Benjamin Frank, Daniel Peterson, Cleve Bare
Syracuse University-George Kyanka
  • Journal Article
  • 2011-01-0288
Published 2011-04-12 by SAE International in United States
The energy dissipated by the fracture of wooden utility poles during vehicle impacts is not currently well documented, is dependent upon non-homogenous timber characteristics, and can therefore be difficult to quantify. While there is significant literature regarding the static and quasi-static properties of wood as a building material, there is a narrow body of literature regarding the viscoelastic properties of timber used for utility poles. Although some theoretical and small-scale testing research has been published, full-scale testing has not been conducted for the purpose of studying the vehicle-pole interaction during impacts. The parameters that define the severity of the impact include the acceleration profile, vehicle velocity change, and energy dissipation. Seven full-scale crash tests were conducted at Exponent's Arizona test facility utilizing both moving deformable and non-deformable barriers into new wooden utility poles. The vehicle energy was dissipated in a bi-modal event for the non-deformable barrier tests and a tri-modal event for the deformable barrier tests. In the deformable tests, the three modes were identified as 1) deformation of the vehicle structure, 2) fracture and…
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