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In-vehicle diagnostic system for prognostics and OTA updates of automated / autonomous vehicles.

Softing Automotive Electronics GmbH-Peter Subke, Muzafar Moshref, Julian Erber
  • Technical Paper
  • 2020-01-1373
To be published on 2020-04-14 by SAE International in United States
The E/E architecture of a modern passenger car consist of a central connectivity gateway that comes with an interface to the legally required OBD connector (SAE J1978), to domain controllers and to a Telematic Control Unit (TCU). The TCU supports 4G or 5G and provides the wireless connection to the cloud. The domain controllers are connected to the gateway via 2-wire Ethernet with a star topology, whereby the domain controllers act as gateways to CAN FD bus systems. The interface to the wired OBD connector supports both OBD/UDS on CAN and UDS on IP. The new E/E system comes with increased self-diagnostic capabilities. They automatically perform tests, log diagnostic data and push such data for prognostics purposes to the cloud. They also support over-the-air (OTA) updates. This paper describes the components of an E/E system that is equipped with an in-vehicle diagnostic tester. The tester consists of standardized components, including MVCI D-Server (ISO 22900), ODX (ISO 22901), OTX (ISO 13209) and UDS on IP (ISO 14229-5). The paper includes a description of cybersecurity measures to…
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Bicycle Braking Performance Testing and Analysis

Momentum Engineering Corp.-Nicholas Famiglietti, Benjamin Nguyen, Edward Fatzinger, Jon Landerville
  • Technical Paper
  • 2020-01-0876
To be published on 2020-04-14 by SAE International in United States
The goal of this study was to determine the braking capabilities of different bicycle types, with different brake setups and applications. A variety of bicycles, including a mountain bike, beach cruiser, BMX bike, road bike, and commuter bike were used to perform brake-to-stop tests. Prior to brake testing, the bicycles were fully inspected, prepped, and documented. Details of the bicycles’ make, model, tires, wheels, brake setup, suspension setup, and preexisting damage were photographed and recorded. The standardized brake testing procedure consisted of rear only brake application and both front and rear brake application. In order to maintain brake application consistency, a single rider performed all series of the skid/brake tests at the same location, on dry asphalt. The tests were performed at an initial velocity of 9 – 20 mph. For each test, the rider accelerated to the test speed and applied maximum braking effort while maintaining a natural upright position to reduce lean. The tests were performed on a painted grid for visibility purposed in measuring skid lengths and post-test video analysis. The bicycle…
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Security Analysis of Android Automotive

Georgia Institute of Technology-Josiah Bruner
Harman International-Amy Chu
  • Technical Paper
  • 2020-01-1295
To be published on 2020-04-14 by SAE International in United States
In-vehicle infotainment (IVI) platforms are getting increasingly connected. Besides OEM apps and services, the next generation of IVI platforms are expected to offer third-party application integration. Under this business model, vehicular sensor and event data can be collected and shared with selected third-party apps. To this end, Google is pushing towards standardization among proprietary IVI operating systems with their Android Automotive platform which is running natively on the vehicle’s IVI platform. Unlike Android Auto’s limited functionality of display-mirroring certain smartphone apps to the IVI screen, Android Automotive will have access to the in-vehicle network (IVN) and be able to read and share various sensor data from the car with third-party apps. This increased connectivity opens new business opportunities for both the car manufacturer as well as third-party entities, but also introduces a new attack surface on the vehicle. Therefore, Android Automotive must have a secure system architecture to prevent any potential attacks that might compromise the security and privacy of the vehicle and the driver. In particular, malicious third-party entities could possibly remotely compromise a…
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A Study on the Development of Aerostructures Design for Assembly Guidelines and their Effective use to Proactively Identify Opportunities for Improvement in Mitigating Common Defects of the Aerostructures Assembly.

GITAM School of Technology, Hyderabad-Mani Rathinam Rajamani, Eshwaraiah Punna
  • Technical Paper
  • 2020-01-0009
To be published on 2020-03-10 by SAE International in United States
An Aircraft’s assembly process plays a vital part in its design, development and production phases and contributes to about half of the Total cost spent in its entire product lifecycle. DFA principles have been one of the proven effective methodologies in Automotive and Process industries. Use of DFA principles have resulted in proactively simplifying and optimizing engineering designs with reduced product costs, and improved inefficiencies in product design and performance. Standardization of Assembly guidelines is vital for “Design and Build” and “Build-To-Print” manufacturing supplier organizations. However, Standardizing design methodologies, through use of proven tools like Advanced Product Quality Planning, (APQP) are still in the initial stages in Aerospace part and process design processes. Thus, there is a tremendous opportunity for research on the application of the existing DFA guidelines to optimize Engineering Aerospace Assembly processes aiming to simplify, standardize design methodologies by building on existing industry practices which have a common platform for design communication and are easy to adopt within the existing process/systems. This technical paper is to discuss the framework for application of…
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Estimated Spectrum Adaptive Postfilter (ESAP)

  • Magazine Article
  • TBMG-35978
Published 2020-02-01 by Tech Briefs Media Group in United States

The Estimated Spectrum Adaptive Postfilter (ESAP) is an adaptive digital image processing tool that enhances standardized digital JPEG imagery, MPEG video, and HDTV at very low bit rates (less than 0.25 BPP). Since these digital technologies can be scaled down to accommodate the low bit rates needed in constrained bandwidth space exploration applications, ESAP can be used to compensate for these low bit rates where applicable.

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Design and Development of Rechargeable Lithium Battery Systems for Aerospace Applications

AE-7D Aircraft Energy Storage and Charging Committee
  • Aerospace Standard
  • AIR6343
  • Current
Published 2020-01-21 by SAE International in United States
This AIR is intended to provide a basic overview of methodologies that should be utilized when undertaking the design and development of rechargeable lithium battery systems for aerospace applications. The battery system includes the battery cells, monitoring and control electronics, and battery charger as applicable. The methodologies presented herein apply to “installed” equipment which would be part of the original or supplemental type certification or military airframe qualification.
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Wire Fed Laser Directed Energy Deposition Additive Manufacturing Process (L-DED-wire)

AMS AM Additive Manufacturing Metals
  • Aerospace Material Specification
  • AMS7010
  • Current
Published 2020-01-14 by SAE International in United States
This specification establishes process controls for the repeatable production of preforms using the wire fed laser directed energy deposition (L-DED-wire) process for additive manufacturing. Preforms are intended to be used to manufacture aerospace parts, but usage is not limited to such applications.
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Optimization and Numerical Simulation Applied to Design of Stamping Dies

Federal University of Sao Joao del Rei – UFSJ-Otavio Andrade, Marcio Eduardo Silveira
  • Technical Paper
  • 2019-36-0142
Published 2020-01-13 by SAE International in United States
The stamping process is commonly used, it is easily found in vehicles manufacturing. The stamping tool is composed by elements such as: die, punch, drawbeads and blankholder. The objective of this paper is to improve the structural stiffness and to reduce the weight of die through numerical optimization. Usually are used standardized stamping tool's parts that follows standard guidelines. The only part of stamping tool considered in the methodology was the die, other parts like punch and blankholder can also be optimized. A vehicle hood was designed in CAD and after that it was exported to CAE to start the simulations, the first step was the die generation. After that, a stamping process was simulated and the contact forces in the die were extracted and then applied in the control volume designed in CAD. Finally, the constraints, objectives and parameters were changed, so the topological optimization was generated. The results were interpreted and a layout were design in CAD following the pattern given by the optimization. Two different load cases are applied to the die…
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Comparison between the WLTC and the FTP-75 driving cycles applied to a 1.4 L light-duty vehicle running on ethanol

Federal University of Santa Maria-Maria F. P. Mazer, Leonardo S. Hatschbach, Igor R. dos Santos, Juliano P. Silveira, Roberto A. Garlet, Mario E. S. Martins, Macklini Dalla Nora
  • Technical Paper
  • 2019-36-0144
Published 2020-01-13 by SAE International in United States
The forecast scenarios regarding the environmental pollution raises a question whether the current vehicle emission certification is reliable enough to assure fleet agreement with the legal limits. Type approval tests have been performed on chassis dynamometer in order to evaluate the emission factors and fuel consumption for passenger cars. Standardized procedures such as the FTP-75 proposed in the United States (currently incorporated in the Brazilian legislation) and the Worldwide harmonized Light vehicles Test Cycle (WLTC), a transient driving cycle model designed by the European Union to overcome the shortcomings of the New European Driving Cycle (NEDC), are discussed in this paper. Both cycles were performed in a chassis dynamometer with a flex-fuel passenger car running on ethanol blend (E92W08). The driver, vehicle and fuel were kept constant so the comparison between the cycles would not be compromised. The vehicle chosen was a 1.4 dm3 displaced volume FIAT sedan with maximum power of 60 kW at 5500 rpm and maximum torque of 122 Nm at 2250 rpm. The cycle dynamics and the engine operation points were…
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SAE STANDARDS NEWS

Automotive Engineering: January/February 2020

  • Magazine Article
  • 20AUTP02_06
Published 2020-01-01 by SAE International in United States

SAE publishes On-Route Mechanized Conductive EV Charging Systems Recommended Practices

SAE International published SAE J-3105 Electric Vehicle Power Transfer System Using Conductive Automated Connection Devices Recommended Practice in January 2020. The document promotes the safe testing and performance of mechanized conductive power transfer systems. Written for buses and heavy-duty vehicles in general, SAE J-3105 encompasses the general physical, electrical, functional, testing and performance requirements for conductive power transfer primarily for vehicles using a conductive automated-charging-device (ACD) connection capable of transferring DC power.

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