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Programming Light on a Chip

  • Magazine Article
  • TBMG-34606
Published 2019-06-01 by Tech Briefs Media Group in United States

Microwave signals are ubiquitous in wireless communications but interact too weakly with photons. A technique was developed to fabricate high-performance optical microstructures using lithium niobate, a material with powerful electro-optic properties. The new integrated photonics platform can store light and electrically control its frequency (or color) in an integrated circuit. The platform draws inspiration from atomic systems and could have a wide range of applications including photonic quantum information processing, optical signal processing, and microwave photonics.


Dynamic Correction Strategy for SOC Based on Discrete Sliding Mode Observer

CATARC-Denggao Huang, Jing Zhao, Zhongwen Zhu, Cheng Li, Jinfeng Gong
Published 2019-04-02 by SAE International in United States
Battery state estimation is one of the most important decision parameters for lithium battery energy management. It plays an important role in improving battery energy utilization, ensuring battery safety and enhancing system reliability. This paper is proposed to provide a dynamic correction of SOC in the full working condition, including static condition and dynamic condition. Based on the Coulomb-counting method, the current SOC value of the battery is calculated. Under the static conditions, the open circuit voltage of the battery is used to directly collect the initial SOC. Under the dynamic working conditions, the open circuit voltage of the battery is estimated by the sliding mode observer. Based on the deviation between the calculated and estimated values of the open circuit voltage, the current coefficient of the Coulomb-counting method is dynamically corrected by PI strategy. The research shows that the proposed strategy can effectively correct the deviation of SOC in the initial process and the discharge process, and avoid the problem that the existing “open circuit voltage + Coulomb-counting” method cannot dynamically correct the SOC…
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Battery Current Control Algorithms in an Electric Two Wheeler

Ather Energy-Shivaram Venkateswaran, Lokesh Soni
Published 2019-01-09 by SAE International in United States
Various current control algorithms are presented in this paper to prevent vehicle cut-off and increase the range of an electric 2 wheeler based on SoC, battery temperature and motor temperature. At lower SoCs if the current demand is very high there is a possibility of cell voltage hitting the lower threshold voltage leading to cut-off. An algorithm is proposed where current (maximum allowed) derating is done based on reducing SoC, battery voltage and real time throttle demand.Lithium ion cells operating temperature has an upper cap. Rate of increase of battery temperature mainly depends on current demand by motor while the initial battery temperature also depends on ambient temperature. To prevent the battery temperature from reaching the upper threshold a battery temperature based current (maximum allowed) derating algorithm is used.As one algorithm affects the other, this leads to Multi Input Single Output (MISO) system configuration. Both the algorithms along with motor fan control based on motor temperature are clubbed. Model developed in Matlab/Simulink is implemented on real vehicle and data is compared/analyzed.
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Honda R&D Technical Review October 2018

  • Book
  • B-HON-024
Published 2018-10-01 by Honda Motor Co., Ltd. in Japan

Honda's October 2018 R&D Technical Review features cutting-edge developments and new ways of solving engineering problems. Research papers related to Honda R&D Center activities worldwide cover the work of engineering teams in automobile, motorcycle, power products, aircraft engine, and other fundamental technologies. This edition brings 15 technical papers and provides featured topics that include: • Development of the 2018 Gold Wing • Intelligent Power Unit for the 2018 Model Year Accord Hybrid • Analysis of Capacity Fading for High-Power Lithium Ion Rechargeable Batteries


Graphene Oxide Nanosheets for Lithium-Metal Batteries

  • Magazine Article
  • TBMG-32489
Published 2018-08-01 by Tech Briefs Media Group in United States

Lithium-metal batteries — which can hold up to ten times more charge than lithium-ion batteries — haven't been commercialized because of a fatal flaw: as the batteries charge and discharge, lithium is deposited unevenly on the electrodes. This buildup cuts the lives of these batteries too short to make them viable, and more importantly, can cause the batteries to short-circuit and catch fire.


Aviation Visual Distress Signals (AVDS)

S-9A Safety Equipment and Survival Systems Committee
  • Aerospace Standard
  • AS5134B
  • Current
Published 2018-06-12 by SAE International in United States
This SAE Aerospace Standard (AS) provides minimum performance and design standards for a handheld, high-intensity, flashing Aviation Visual Distress Signal (AVDS) based on light-emitting-diode (LED) technology operating simultaneously in visible (white) and near infrared (NIR) spectra designed to facilitate location and rescue of aviation accident/ditching survivors in open sea conditions.
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Q&A: Dr. Yimei Zhu, Senior Physicist, Brookhaven National Laboratory, Upton, NY

  • Magazine Article
  • TBMG-28865
Published 2018-05-01 by Tech Briefs Media Group in United States

Researchers at Brookhaven National Laboratory have observed how lithium moves inside individual nanoparticles that make up batteries. The finding could help companies develop batteries that charge faster and last longer.


Lightweight Carbon Composite Chassis for Engine Start Lithium Batteries

SAE International Journal of Materials and Manufacturing

Meggitt Composites-Dennis Moxley
Meggitt PLC-Thomas Black
  • Journal Article
  • 05-11-01-0003
Published 2018-03-07 by SAE International in United States
The supersession of metallic alloys with lightweight, high-strength composites is popular in the aircraft industry. However, aviation electronic enclosures for large format batteries and high power conversion electronics are still primarily made of aluminum alloys. These aluminum enclosures have attractive properties regrading structural integrity for the heavy internal parts, electromagnetic interference (EMI) suppression, electrical bonding for the internal cells, and/or electronics and failure containment. This paper details a lightweight carbon fiber composite chassis developed at Meggitt Sensing Systems (MSS) Securaplane, with a copper metallic mesh co-cured onto the internal surfaces resulting in a 50% reduction in weight when compared to its aluminum counterpart. In addition to significant weight reduction, it provides equal or improved performance with respect to EMI, structural and flammability performance. This application of the technology outlined in this paper pertains to an engine-start battery chassis. However, strategically embedding metallic mesh within composite materials may be utilized in numerous other applications of aviation electronics enclosures.
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SAE Truck & Off-Highway Engineering: February 2018

  • Magazine Issue
  • 18TOFHP02
Published 2018-02-01 by SAE International in United States
Electrification not a one-size-fits-all solution Efforts in the off-highway industry have been under way for decades, but the technology still faces implementation challenges.SuperTruck redux A year plus into phase two of the promising DOE program to dramatically improve freight efficiency, project leads from three of the participating truck OEMs share their progress thus far and technology paths moving forward.From research to reality Danfoss works closely with off-highway OEMs throughout the development process, testing and demonstrating machines packed with new technology features.Big Data a focus for 2018 SAE President Mircea Gradu Velodyne CQO sees use of Big Data as a way to capitalize on multiple industry trends including vehicle electrification and automated vehicles.Editorial Commercial vehicles invade CESKomatsu building AI into construction sitesGaining the Manufacturing 4.0 advantage with data-driven in-process testingPaccar reveals new and future tech at CES 2018ChemSEI-Linker extends lithium battery life, increases EV rangePowertrain mix for CVs in Europe set to diversify, but cost is criticalToyota unveils autonomous e-commerce concept vehicle, development allianceQ&A Director of the U.S. Army Tank Automotive Research, Development and Engineering Center…

ChemSEI-Linker extends lithium battery life, increases EV range

SAE Truck & Off-Highway Engineering: February 2018

Matthew Borst
  • Magazine Article
  • 18TOFHP02_09
Published 2018-02-01 by SAE International in United States

New technologies continue to push the boundaries of battery technology. As electrification becomes more prevalent in the heavy-duty and off-highway industries, battery capabilities continue to be a vital link in what new, advanced powertrains are able to accomplish. The Industrial Technology Research Institute (ITRI), Taiwan's largest technology R&D institution, has announced a new material designed to increase cycle life and improve recyclability of lithium batteries.

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