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Parameter Optimization of Two-speed AMT Electric Vehicle Transmission System

Wuhan University of Technology-Jian Cui, Gangfeng Tan, Jia'ao Feng, Zhongpeng Tian, Philip Agyeman
  • Technical Paper
  • 2020-01-0435
To be published on 2020-04-14 by SAE International in United States
At present, small electric vehicles are often equipped with only a single-stage final drive. Although the single-stage speed ratio can meet the general driving requirements of electric vehicles, if the requirements of the maximum speed and the requirements for starting acceleration or climbing are met at the same time, the power demand of the drive motor is relatively large, and the efficient area of the drive motor may be far away from the operating area corresponding to daily driving. If the two-speed automatic transmission is adopted, the vehicle can meet the requirements of maximum speed, starting acceleration and climbing at the same time, reduce the power demand of the driving motor, and improve the economy under certain power performance. This is especially important for medium and large vehicles. Therefore, this paper considers that the working torque and speed of the motor can be changed by optimizing the speed ratio of transmission and changing the gear position, so that the motor can work more in the high-efficiency zone. Taking an electric logistics vehicle with a drive…

“Smart” Frequency-Sensing Charge Controller for Electric Vehicles

  • Magazine Article
  • TBMG-35963
Published 2020-02-01 by Tech Briefs Media Group in United States

As plug-in hybrid electric vehicles and battery electric vehicles become more popular, they create additional demand for electricity. Their emergence also raises issues regarding how, where, and when car batteries should be charged and the resulting load on the power grid.

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Upper Frequency Measurement Boundary for Evaluation of Shielding Effectiveness in Cylindrical Systems

AE-4 Electromagnetic Compatibility (EMC) Committee
  • Aerospace Standard
  • AIR1700A
  • Current
Published 2020-01-30 by SAE International in United States
This AIR points out that above a frequency called the “transition frequency,” variances associated with the shielding effectiveness measurements can become large. It includes the derivations to demonstrate this. This fact should be taken into account when designing shielding for use above the transition frequency.
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Potassium-Oxygen Battery Stores Clean Energy

  • Magazine Article
  • TBMG-35692
Published 2019-12-01 by Tech Briefs Media Group in United States

Researchers have developed a more efficient, more reliable potassium-oxygen battery with a cathode that stores the energy produced by a chemical reaction in a metal-oxygen or metal-air battery. The battery could make renewable energy sources like solar and wind more viable options for the power grid through cheaper, more efficient energy storage.

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Demand Side Load Management by Using Priority Based Load Shedding Algorithm with and without Renewable Energy Generation

SRM Institute of Science And Technology-Rajarajeswari Rathinam, Suchitra Dayalan
Published 2019-10-11 by SAE International in United States
Demand side load management (DSLM) emphasizes control of the power demanded, by reducing the peak load and control of energy utilization of the system. DSLM is introduced to improve the flexibility of the grid power usage and also to aid the utilization of Renewable Energy Generation (REG) which is intermittent. In this work, implementation of load shedding (LS) algorithm for the residential load is performed with the limit of power as constraint, considering REG and grid in three different modes of operation. Solar and Wind power are the REG considered in this work. Priority Based Load Shedding (PBLS) is performed to limit the power consumption of equipment during peak hours with the implementation of varying pricing signal. In order to implement PBLS, three residential user load data for 24 hours is considered. The users are categorized as low, medium and high priority user. The priority of the user is based on the load consumption for 24 hours. The proposed LS scheme is performed, depending on the power requirements of Home Electric Devices (HEDs) and the…
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National Energy Technology Laboratory

  • Magazine Article
  • TBMG-34927
Published 2019-08-01 by Tech Briefs Media Group in United States

The National Energy Technology Laboratory (NETL) is a U.S. Department of Energy (DOE) national laboratory — with sites in Anchorage, AK; Albany, OR; Morgantown, WV; and Pittsburgh, PA — that produces technological solutions to America's energy challenges. For more than 100 years, NETL — and its predecessor facilities — has advanced technology to provide clean, reliable, and affordable energy to the American people.

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Use Cases for Communication Between Plug-in Vehicles and the Utility Grid

Hybrid - EV Committee
  • Ground Vehicle Standard
  • J2836/1_201907
  • Current
Published 2019-07-15 by SAE International in United States
This SAE Information Report establishes Use Cases for communication between plug-in electric vehicles (PEVs) and the electric power grid, for energy transfer and other applications.
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S400 Copper Media Interface Characteristics Over Extended Distances

AS-1A Avionic Networks Committee
  • Aerospace Standard
  • AS5643/1A
  • Current
Published 2019-07-09 by SAE International in United States
This SAE Aerospace Standard (AS) establishes guidelines for the use of IEEE-1394-2008 Beta (formerly IEEE-1394b) as a data bus network in military and aerospace vehicles. It encompasses the data bus cable and its interface electronics for a system utilizing S400 over copper medium over extended lengths. This document contains extensions/restrictions to “off-the-shelf” IEEE-1394 standards, and assumes that the reader already has a working knowledge of IEEE-1394. This document does not identify specific environmental requirements (electromagnetic compatibility, temperature, vibration, etc.); such requirements will be vehicle-specific and even LRU-specific. However, the hardware requirements and examples contained herein do address many of the environmental conditions that military and aerospace vehicles may experience. One should refer to the appropriate sections of MIL-STD-461E for their particular LRU, and utilize handbooks such as MIL-HDBK-454A and MIL-HDBK-5400 for guidance. This document is referred to as a “slash sheet” and accompanies the AS5643B base standard.
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An Experimental Study of Atmospheric Icing Process on Power Transmission Line

Iowa State University-Ramsankar Veerakumar, Linyue Gao, Yang Liu, Hui Hu
Published 2019-06-10 by SAE International in United States
Atmospheric icing poses a major threat to power transmission lines in cold regions. In the present study, an experimental investigation was conducted to examine the atmospheric icing process on high-voltage power transmission lines and characterize the effects of the ice accretion on the aerodynamic forces acting on the transmission lines. The experimental study was conducted in the Icing Research Tunnel available at Iowa State University (ISU-IRT). A cylinder model with the same diameter of commonly-used high-voltage power transmission lines (i.e., D = 29mm) is subjected to a typical glaze icing condition at an incoming wind speed of 20 m/s, a liquid water content (LWC) of 2.0 g/m3 and an ambient temperature of -5 0C. A high-resolution 3D scanner was used in the present study to extract the 3D shapes of the ice structures accreted over surface of the cylindrical test model as a function of the ice accretion time. While the aerodynamic drag force acting on the test model was measured by using a force transducer during the dynamic ice accreting process, a high-resolution Particle…
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ONR Short Pulse Research, Evaluation and non-SWaP Demonstration for C-sUAV Study

Aerospace & Defense Technology: June 2019

  • Magazine Article
  • 19AERP06_09
Published 2019-06-01 by SAE International in United States

Research project is designed to map small unmanned aerial vehicle (sUAV) effects space, empirically and by simulation, as a function of high power microwave (HPM) waveform to develop effective countermeasures.

The OSPRES (ONR Short Pulse Research, Evaluation and non-SWaP) program performed fundamental work in the areas of Silicon (Si) and Gallium Nitride (GaN) based photoconductive switch development, measurement of HPM waveform dependent effects on small unmanned aerial vehicle (sUAV), adaptive design of experiments, noise injection, RF coupling to sUAV's, minimally dispersive wave theory, and positive feedback non-linear transmission line (NLTL) development.

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