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EMC challenges & solutions for Electric Buses

ICAT-Enoch Eapen
  • Technical Paper
  • 2019-28-2503
To be published on 2019-11-21 by SAE International in United States
EMC challenges & solutions for Electric Buses Enoch Eapen, Devender Kumar and Madhusudan Joshi International Centre for Automotive Technology, Manesar Electric buses are talk of the town in India with Government pushing the implementation of E-mobility in general and for public transportation in particular. However due to high voltages and complex power electronics design, it often becomes difficult to deal with EMC related non-compliances. ICAT being largely experienced in the EMC testing and validation of E-buses, would like to present the various EMC challenges and the solutions related to E-buses. In this paper we would share three case studies where the EMC issues related to E-buses were mitigated by either introducing simple changes to the existing design or through large/small modification. We believe that the proposed case studies would help the bus manufactures to understand the real EMC issues closely and implement the solutions accordingly prior to submitting for final certification to the test agencies leading to lesser cost impact and shorter validation time.
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Approach for standardization of Advanced Driving Assistance System (ADAS) in India

International Centre for Automotive Technology-Aditi Sethi
  • Technical Paper
  • 2019-28-2464
To be published on 2019-11-21 by SAE International in United States
Authors: Aditi Sethi1, Siddhanta Shrivastava2, Madhusudan Joshi3 Organization: 1,2,3 International Centre for Automotive Technology, Manesar Introduction: With the increasing utilization of electronics in Indian automobile industry, there is an essential requirement for standardizing the functional safety of sub-systems that constitute advanced driving assistance system (ADAS) as it would be the foundation stone for the automated vehicles in future. These systems assist the driver and the driving process, further increasing the car safety and road safety, subsequently reducing human error. Due to interaction of several electronic control units (ECUs) in a vehicle and complexity of the system, electronic stability plays a vital role. Therefore, the standards shall be more performance oriented and technology neutral. They shall also cover validation tests associated with safety, mechanical rigidity, durability, environmental protection and electromagnetic compatibility. Standardization of ADAS would authenticate the quality, regulate and smoothen the uniform implementation of these sub-systems. Interestingly the standardization of ADAS is in progress at the international level. It is therefore pertinent to consider adoption, formulation or both of international standards as a part of…
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Optimization of An EV Controller Design For A Three Wheeler BOVs - EMC Approach

International Centre for Automotive Technology-Nikhil Grover
  • Technical Paper
  • 2019-28-2474
To be published on 2019-11-21 by SAE International in United States
Introduction: The advent of electric mobility is changing the conventional mobility techniques and their application in automobiles across all segments. Three wheeler Battery Operated Vehicles (BoVs) are a special category of electric vehicles (EVs) as far as EMC compliance is concerned. The problem mainly lies with the open body design and cost cutting measures being exercised by the manufactures which makes Electromagnetic compatibility (EMC) compliance challenging. Objective: Though it is sometimes possible to resolve EMC malfunctions related to motor power cable, cables & wiring harness etc. using external techniques post design stage, but controller being a closed and typical element makes it difficult to improve against EMC malfunctions using external techniques. This paper would concentrate on the controller design parameters and improvement of the same in terms of Electromagnetic compatibility (EMC) and performance efficiency at the design stage itself. Methodology: This study would concentrate on designing of motor controller for three wheeler EVs, improving and optimizing the EMI/EMC aspects of the design and its performance with the following aspects in mind: 1. Selection of critical…
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Research on Electromagnetic Compatibility for Wireless Charging System of Electric Vehicles

CATARC-Li Jiang, Haiming Liu, Yifu Ding, Xu Zhang, Yue Zhang
Published 2019-11-04 by SAE International in United States
Currently, there are no specific standards on electromagnetic compatibility (EMC) test for wireless charging system of electric vehicles (EVs). However, the EMC test items have been summarized in some international standards. And the national standard is under developing. In order to support the formulation of corresponding national standards and regulations, promote the rapid development of EVs industry and support the implementation of the national strategy of new energy vehicles (NEVs) and intelligent network vehicle, we carry out the EMC test for wireless charging systems. In this paper, the wireless charging system of EVs is taken as the research object, which can also been called equipment under test (EUT). Firstly, an introduction of the research status was summarized. And then, the influence parameters such as output power and offset are analyzed. Based on the analysis, the EMC test was implemented to evaluate the EMC performance of EUT. Finally, the relevant research results will provide support for the formulation of national standard.
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Research on Test Method for Shielding Effectiveness to Cable of Vehicles

CATARC-Li Jiang, Xichen Chen, Haiming Liu, Zaiyuan Wu, Yun Wang
Published 2019-11-04 by SAE International in United States
With the development of electric vehicles (EVs), hybrid electric vehicles (HEVs) and fuel cell vehicles (FCVS), high voltage and large-current are applied to cables. Therefore, it is important to avoid electromagnetic compatibility (EMC) problems of cables, and a measurement methods is necessary for the shielding effectiveness of shielding cables. This paper discusses the existing test methods of cable shielding effectiveness and summarizes the main problems and deficiencies. Then, according to the practical requirements of high voltage cable testing, the direct injection method based on the national standard GB/T 18655-2018 (modified international standard CISPR 25) is proposed. The test method is verified by constructing a practical test platform. The test result show that the platform built can meet the test requirements of the new energy vehicles (NEVs) GB/T 18387 test frequency band 150k~30MHz, and can also meet the test requirements of the 150k~108MHz frequency band of the key component conducted emission of NEVs.
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Aircraft Electrical Installations

AE-8A Elec Wiring and Fiber Optic Interconnect Sys Install
  • Aerospace Standard
  • ARP4404C
  • Current
Published 2019-09-19 by SAE International in United States
It is the purpose of this document to present design recommendations that will provide a basis for satisfactory and safe electrical installations in transport aircraft. This document is not intended to be a complete electrical installation design handbook. However, the requirements for safety extend so thoroughly throughout the electric systems that few areas of the installation are untouched by the document. It is recognized that individual circumstances may alter the details of any design. It is, therefore, important that this document not be considered mandatory but be used as a guide to good electrical application and installation design. Transport aircraft electric systems have rapidly increased in importance over a number of years until they are now used for many functions necessary to the successful operation of the aircraft. An ever increasing number of these functions are critical to the safety of the aircraft and its occupants. The greatly increased power available in electric systems is another factor in aircraft safety. These considerations make it essential that aircraft electrical design practices be carefully considered from the…
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10 Things to Consider When Specifying Small Metal and Plastic Enclosures

  • Magazine Article
  • TBMG-35122
Published 2019-09-01 by Tech Briefs Media Group in United States

Your new industrial electronic product has been designed and the board components specified. It has been prototyped, either on a development board to check functionality and performance or laid out on a final PCB design. It has been debugged, tested, tweaked, tested again, and finally signed off for production. So far, so good. Now all that has to be done is to decide on the enclosure. In the ideal world, the enclosure would have been selected far earlier in the process so that, in particular, the size constraints of the PCB would be known. In the real world, the first question is normally, “What size box do I need?”

Using Monolithic Filters to Address EMI in Medical Devices

  • Magazine Article
  • TBMG-35100
Published 2019-09-01 by Tech Briefs Media Group in United States

Many factors are conspiring to increase the amount of “noise” or interference that can disturb the functionality and even damage electronic devices, starting with the sheer number used in our vicinity at any given time. Today’s Wi-Fi or Bluetooth-enabled medical instruments and even medical implants provide a prime example.

The Many Uses of Inductive Position Sensors in the IIoT

  • Magazine Article
  • TBMG-35198
Published 2019-09-01 by Tech Briefs Media Group in United States

The IIoT is all about communication of information concerning the status of devices and being able to control them remotely. This imposes a whole new set of requirements on sensors. They have to be designed to be able to interface well with electronics and computers, with all of the complications of that, such as EMC — sensitivity to, and generation of, noise and interference. This can only be achieved with intelligent sensors. We interviewed K. Mark Smith, Ph.D., Senior Product Manager, Sensors, Microchip Technology, (Chandler, AZ) about the role of inductive position sensors in the IIoT.

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Wiring Aerospace Vehicle

AE-8A Elec Wiring and Fiber Optic Interconnect Sys Install
  • Aerospace Standard
  • AS50881G
  • Current
Published 2019-08-06 by SAE International in United States
This specification covers all aspects in Electrical Wiring Interconnection Systems (EWIS) from the selection through installation of wiring and wiring devices and optical cabling and termination devices used in aerospace vehicles. Aerospace vehicles include manned and unmanned airplanes, helicopters, lighter-than-air vehicles, missiles, and external pods.
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