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Energy Harvesting Circuit for Energy Re-Generator Shock Absorber With Impulse Excitation to a Vehicle

[+] Author Affiliations
Wei Wu, Fengxia Wang, Andy G. Lozowski

SIU Edwardsville, Edwardsville, IL

Paper No. IMECE2015-50646, pp. V06AT07A052; 8 pages
  • ASME 2015 International Mechanical Engineering Congress and Exposition
  • Volume 6A: Energy
  • Houston, Texas, USA, November 13–19, 2015
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5743-4
  • Copyright © 2015 by ASME


The inadequate power harvested from piezoelectric materials makes online tuning of the converter duty cycle and switching frequency a difficult task. This paper presents an open-loop control with pre-computed duty cycle profiles to minimize power consumption. Considering the real input signal to the shock absorber is non-sinusoidal when the vehicle passes through a bump, it is beneficial and necessary to apply a suitable duty cycle profile to every impulse excitation so that the power yield is maximized. The power expense is greatly reduced by first calculating offline the array of optimum duty cycle profiles matching a variety of impulse responses using the shock absorber performance model. The profiles are then stored into the micro-controller look-up table and used as needed during the operation of the vehicle.

Copyright © 2015 by ASME



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