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Comparative Analysis of power pad for Wireless Charging of Electric Vehicles

Aligarh Muslim University-Aqueel Ahmad, M. Saad Alam
Florida International University-Ahmed Mohamed
  • Technical Paper
  • 2019-01-0865
To be published on 2019-04-02 by SAE International in United States
Electric Vehicle is a very potential alternative to gasoline vehicles. Major EV challenge is electrical energy charging and storage. Charging of the EV is a big challenge due to hours of time to charge. Wireless charging can automate the charging of EV, very easily connected with IoT based smart systems. Inductive wireless charging includes the concept of mutual induction between transmitter and receiver through a time-varying magnetic field. The efficiency of wireless charging collectively depends on the design of the power pad, frequency level of power transfer, the distance between the transmitter and receiver, alignment between the coils. Coils design comprehend the shape of the coil, material of the coil used, the thickness of the wire used and core shape and material used in the core. The manuscript compares the power pad coil shapes, with the introduction of ferrite core across the coils to design an extremely efficient power pad for the wireless charging of electric vehicle (EV). A 3D finite element method was used for analysis, due to the unconventional distribution of the flux.…
 

Robot-Based Fast Charging of Electric Vehicles

Graz University of Technology-Bernhard Walzel, Mario Hirz, Helmut Brunner
representing BMW Group-Nico Kreutzer
  • Technical Paper
  • 2019-01-0869
To be published on 2019-04-02 by SAE International in United States
Automated, conductive charging systems enable both the transmission of high charging power for long electric driving distances as well as comfortable and safe charging processes. Particularly in connection with autonomously driving and parking vehicles, new fields of application and opportunities are emerging. This paper deals with the definition of requirements for automated conductive charging stations and highlights the development and conception of a robot-based prototype for automated charging of electric and plug-in hybrid vehicles. In cooperation with the project partners BMW AG, Magna Steyr Engineering, KEBA AG and the Institute of Automotive Engineering of Graz University of Technology, the development and implementation of the prototype took place in the course of a governmental funded the research project titled “KoMoT”. In the presented approach, the entire docking and undocking process of the charging cable is performed completely autonomously by a robotic arm. An essential aim of the research activities was to design the sensor technology and the robot system control in such a way, that even when using different vehicle types and vehicle positions no adaptations…
 

An Approach for Mutual Inductance Identification of Wireless Power Transfer System in Electric Vehicle Charging Applications

Tongji University-Xiong Meng, Xuezhe Wei, Haifeng Dai
  • Technical Paper
  • 2019-01-0866
To be published on 2019-04-02 by SAE International in United States
As a key parameter of fundamental electrical, mutual inductance always used to characterize the overall performance of wireless power transfer (WPT) system in electric vehicle charging applications. However, in real case, factors such as parking misalignments, load variations and intrusion of foreign objects would result in a variation of mutual inductance between both coils, which may adversely impact on transmitted power and transmission efficiency. Therefore, in this paper, we propose to identify mutual inductance parameter with the least square method (LSM) based on the equivalent circuit model. In section II, COMSOL is adopted to simulate mutual inductance variation with the change of lateral offset. In section III, the differential equation is derived from the state space equation of the WPT system. Through identifying the process parameters, the mutual inductance of coils can be obtained by the functional relationship between them. In section IV, by means with simulation used MATLAB/Simulink, we verified the feasibility of mutual inductance identification with LSM. Compared with the numerical value of COMSOL simulation, the MATLAB result shows that the identification accuracy…
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Power Quality Requirements for Plug-In Electric Vehicle Chargers

Hybrid - EV Committee
  • Ground Vehicle Standard
  • J2894/1_201901
  • Current
Published 2019-01-23 by SAE International in United States
The intent of this document is to develop a recommended practice for PEV chargers, whether on-board or off-board the vehicle, that will enable equipment manufacturers, vehicle manufacturers, electric utilities, and others to make reasonable design decisions regarding power quality. The three main purposes are as follows: 1 To identify those parameters of PEV battery charger that must be controlled in order to preserve the quality of the AC service. 2 To identify those characteristics of the AC service that may significantly impact the performance of the charger. 3 To identify values for power quality, susceptibility, and power control parameters which are based on current U.S. and international standards. These values should be technically feasible and cost effective to implement into PEV battery chargers. SAE J2894/2 will describe the test methods for the parameters/requirements in this document.
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Alternate Solution for EV Charge Point Infrastructure in Crowded Urban Areas along the Shore

General Motors-Tushar Khanzode
General Motors Technical Center India-Varun Chakrapani, Shivayogi Tippannanavar
Published 2019-01-09 by SAE International in United States
Many countries including India have aggressively aimed to implement electric vehicles (EVs) usage from 2030 onwards. Companies such as General Motors, Uber, Waymo and Nissan etc. are exploring the realm of autonomous vehicles (AV) for use as taxis as early as 2019. Above facts logically arrive at the solution of Autonomous EVs as taxis. With the commitment towards enabling an all-electric future, there exists a need to provide suitable infrastructure for recharging. Major urban cities located by the shoreline such as New York, Hong Kong, Mumbai, Los Angeles etc. have been facing the space crunch, with real estate prices sky-rocketing exponentially. With this premise, the operating company would need a large amount of space to store their EVs for charging which attributes to a longer downtime. This brings a need for an economical charging location that has a reduced usage of urban infrastructure and energy consumption. This study explores the possibility of an alternate charging location for electric AV ride sharing fleet charging with “e-Barge”, a barge dedicated to charge EV vehicles onboard with self-generated…
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ISO 26262 Hazard and Risk Assessment for Hybrid Powertrain

Tata Motors Limited-Rajiv Kumar
Published 2019-01-09 by SAE International in United States
ISO 26262 is an Automotive functional safety standard for Electrical and Electronic system. This paper details application of this standard for hybrid powertrain. The concept of functional safety has been analyzed. First item definition for hybrid powertrain is detailed out. Item definition includes system description, its function, boundary, interfaces to external systems. Hybrid powertrain is used to provide electric traction to the vehicle and to charge the included battery. Battery provides power to electric motor. Major components of hybrid powertrain are Generator, Traction motor, High voltage battery, Inverters and other auxiliary units. The overall powertrain scheme is being discussed from functional safety perspective. Then methods for identifying hazardous situations that could result from malfunctioning behavior at the vehicle level is presented. Each function is analyzed from hazard perspective and all hazards are identified. Identified Hazards are analyzed for different vehicle operating conditions and ASIL rating is identified for each hazard.
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THE NAVIGATOR

Sam Abuelsamid
  • Magazine Article
  • 19AUTP01_08
Published 2019-01-01 by SAE International in United States

There is no such thing as a free lunch, as the old truism goes. For more than a century, the auto industry business model has been to sell it and forget it. Once you drove off the lot in that shiny new machine, you were on your own, aside from warranty repairs for defects or compliance recalls.

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Battery Provides Electric Vehicles with Immunity from Climate Conditions

  • Magazine Article
  • TBMG-33414
Published 2018-12-01 by Tech Briefs Media Group in United States

Conventional lithium-ion batteries cannot be rapidly charged at temperatures below 50 °F. Electric vehicles are popular on the West Coast because the weather is conducive to quick charging. Once the vehicles are moved to the East Coast or Canada, there is a tremendous issue with charging.

 

Instructions for Using Plug-In Electric Vehicle (PEV) Communications, Interoperability and Security Documents

Hybrid - EV Committee
  • Ground Vehicle Standard
  • J2836_201807
  • Current
Published 2018-07-18 by SAE International in United States
This SAE Information Report J2836 establishes the instructions for the documents required for the variety of potential functions for PEV communications, energy transfer options, interoperability and security. This includes the history, current status and future plans for migrating through these documents created in the Hybrid Communication and Interoperability Task Force, based on functional objective (e.g., (1) if I want to do V2G with an off-board inverter, what documents and items within them do I need, (2) What do we intend for V3 of SAE J2953, …).
 

Grid Friendly™ Charger Controller

  • Magazine Article
  • TBMG-28871
Published 2018-05-01 by Tech Briefs Media Group in United States

Electric vehicles are growing in popularity, and while they represent a cleaner alternative to fossil-fueled vehicles, their increased use may stress the grid if this growing load is left unmanaged. A need exists for a method of charging these vehicles that reduces costs for the consumer, while assuring a stable electric grid.