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Proceedings Paper

Integration of regenerative shock absorber into vehicle electric system
Author(s): Chongxiao Zhang; Peng Li; Shaoxu Xing; Junyoung Kim; Liangyao Yu; Lei Zuo
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Paper Abstract

Regenerative/Energy harvesting shock absorbers have a great potential to increase fuel efficiency and provide suspension damping simultaneously. In recent years there’s intensive work on this topic, but most researches focus on electricity extraction from vibration and harvesting efficiency improvement. The integration of electricity generated from regenerative shock absorbers into vehicle electric system, which is very important to realize the fuel efficiency benefit, has not been investigated. This paper is to study and demonstrate the integration of regenerative shock absorber with vehicle alternator, battery and in-vehicle electrical load together. In the presented system, the shock absorber is excited by a shaker and it converts kinetic energy into electricity. The harvested electricity flows into a DC/DC converter which realizes two functions: controlling the shock absorber’s damping and regulating the output voltage. The damping is tuned by controlling shock absorber’s output current, which is also the input current of DC/DC converter. By adjusting the duty cycles of switches in the converter, its input impedance together with input current can be adjusted according to dynamic damping requirements. An automotive lead-acid battery is charged by the DC/DC converter’s output. To simulate the working condition of combustion engine, an AC motor is used to drive a truck alternator, which also charges the battery. Power resistors are used as battery’s electrical load to simulate in-vehicle electrical devices. Experimental results show that the proposed integration strategy can effectively utilize the harvested electricity and power consumption of the AC motor is decreased accordingly. This proves the combustion engine’s load reduction and fuel efficiency improvement.

Paper Details

Date Published: 9 March 2014
PDF: 12 pages
Proc. SPIE 9057, Active and Passive Smart Structures and Integrated Systems 2014, 90570V (9 March 2014); doi: 10.1117/12.2045189
Show Author Affiliations
Chongxiao Zhang, Stony Brook Univ. (United States)
Peng Li, Stony Brook Univ. (United States)
Shaoxu Xing, Stony Brook Univ. (United States)
Junyoung Kim, Stony Brook Univ. (United States)
Liangyao Yu, Tsinghua Univ. (China)
Lei Zuo, Stony Brook Univ. (United States)

Published in SPIE Proceedings Vol. 9057:
Active and Passive Smart Structures and Integrated Systems 2014
Wei-Hsin Liao, Editor(s)

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