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Pixelated-LEDs Car Headlight Design for Smart Driving and CO2 Reduced Emissions.

University of Versailles-Sidahmed Beddar, Jean-Baptiste Millet, Yasser Alayli
  • Technical Paper
  • 2020-37-0018
To be published on 2020-06-23 by SAE International in United States
The advent of Electroluminescent Diode (LED) technologies has been one of the major sources of energy reduction in the domestic lighting sector as well as in the automotive and aerospace fields. In vehicles, the use of LEDs allows a reduction of 110W to 40W useful for the function Dipped-beam is a gain of about 350W in energy consumption of the vehicle with a combustion engine (from 2 to 5g of CO2 per kilometer). In 2010, Adaptive Dipped Beam (ADB (also called glare-free high beam) appeared. The objective of the ADB is to adapt the beam to the presence of vehicles in both directions to improve the driver's long-range visibility without causing discomfort, distraction or glare to other road users. The ADB is a lighting function with high added value in terms of comfort and road safety. The new lighting technologies make this function more and more efficient and effective with a resolution and the number of pixels that increases Pixelated LEDs, by offering various advantages over other architectures, are gaining market shares. They are more…
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Influence of Background Spectral Distribution on Perceptions of Discomfort Glare

Rensselaer Polytechnic Institute-Rohan M. Nagare, John D. Bullough
  • Technical Paper
  • 2020-01-0637
To be published on 2020-04-14 by SAE International in United States
The advent of light-emitting diode (LED) technology for automotive lighting allows flexibility of the spectral distribution of forward headlighting systems, while meeting current requirements for "white" illumination. As vehicle headlights have become whiter (with more short-wavelength light output) over the past several decades, their potential impacts on visual discomfort for oncoming and preceding drivers have been hotly debated. It is known that a greater proportion of short-wavelength energy increases discomfort glare, and that increasing the background light level (e.g., through roadway lighting) will decrease perceptions of discomfort. More recently it has been demonstrated that the visual system exhibits enhanced short-wavelength sensitivity for perceptions of scene brightness. As a result, roads illuminated by light sources with higher correlated color temperatures (CCTs) will be judged as appearing to be brighter than those illuminated to the same light level by sources with lower CCTs. The present laboratory study was conducted to identify whether the increased scene brightness of a road illuminated with greater short-wavelength light helps to mitigate discomfort glare more than the same scene illuminated to the…
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Virtual Switches and Indicators in Automotive Displays

General Motors LLC-Scott Rush
  • Technical Paper
  • 2020-01-1362
To be published on 2020-04-14 by SAE International in United States
Over the last decade, graphical and touch displays have become commonplace in automobile cockpits. Such displays have been used mainly for convenience functions such as navigation, radio, driver information, and vehicle settings. Automakers are now using these displays to generate “virtual” indicators that replace regulated and/or safety-critical physical indicators, such as gear position indication or the Malfunction Indicator Light [MIL]. Automakers are also replacing physical switches and controls, such as heating, ventilation, and air conditioning [HVAC] controls, with “virtual” controls rendered on the cockpit touch-screen. Many of these indicators and controls have regulatory and/or functional safety requirements that have been met using such methods as redundant terminals in a safety-critical switch, or by monitoring the electrical State-of-Health [SOH] of discrete LED indicators. Meeting these requirements with “virtual” graphical elements requires new electronic hardware and software technologies. This paper discusses recent advances in electronic hardware and System-on-Chip [SoC] solutions, operating systems, and supporting software architecture implementation of regulatory and/or functional safety graphics within cockpit displays. Application of the ISO 26262 standard, particularly section 5, and considerations…
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Unsteady Flow Analysis Method for Automobile LED Headlamp based on Massively Parallel CFD considering the External Environment

Hiroshima University-Takuji Nakashima
Kobe University-ChungGang Li, Makoto Tsubokura
  • Technical Paper
  • 2020-01-0636
To be published on 2020-04-14 by SAE International in United States
The aim of this study is to understand the mechanism of dew condensation and try to prevent it on automobile headlamp. In this case, it is necessary to accurately reproduce the complicated shape of the headlamp as the computational model. In addition, the simulation framework for predicting the turbulent flow field accompanied by the high heat source and the wall heat transfer with high accuracy in the vehicle running environment is required. Moreover, using CFD to understand the mechanism of the flow field inside the light emitting diode (LED) headlamp with a rotating fan to cool the light sources, is a challenging task because of the complicated internal structures and significant heat transfer. In this paper, we report that we tried constructing the simulation method of compressible turbulence based on hierarchical Cartesian grid using the HPC (High Performance Computing) environment. At first, we clarified the ventilation phenomenon through the vent holes in the uniform flow, and succeeded in obtaining the knowledge of ventilation control by changing the position and number of the vent holes. The…
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Thin Films of Barium Zirconium Sulfide Offer Exceptional Electronic Properties

  • Magazine Article
  • TBMG-36180
Published 2020-03-01 by Tech Briefs Media Group in United States

Scientists have created thin films made from barium zirconium sulfide (BaZrS3) that combine exceptionally strong light absorption with good charge transport — two qualities that make them ideal for applications such as photovoltaics and light-emitting diodes (LEDs).

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2021 Cadillac Escalade brings a dash of curved OLED - and a diesel

Automotive Engineering: March 2020

Paul Seredynski
  • Magazine Article
  • 20AUTP03_13
Published 2020-03-01 by SAE International in United States

Cadillac has unveiled the 2021 Escalade and will differentiate the full-size SUV from its Tahoe/Yukon platform-mates with a large dose of exclusive technologies including Super Cruise, audio systems from new partner AKG and the industry's slickest display-screen integration. Gaining similar mechanical benefits as its platform siblings, including wheelbase stretches and the new independent rear suspension (IRS) that should improve dynamics along with seating/cargo space, the all-new 2021 Escalade leverages the platform's new digital network architecture (see p.10) to raise the bar for integrated infotainment technology.

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Motorcycle Headlamps

Motorcycle Lighting Committee
  • Ground Vehicle Standard
  • J584_202002
  • Current
Published 2020-02-17 by SAE International in United States
This SAE Standard provides test procedures, performance requirements, design guidelines, and installation guidelines for motorcycle headlamps.
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Smart Photonic Contact Lens for Diabetic Diagnosis and Retinopathy Treatment

  • Magazine Article
  • TBMG-36022
Published 2020-02-01 by Tech Briefs Media Group in United States

Diabetic patients need to measure their blood sugar level by drawing blood before and after a meal. It is easy to develop complications due to diabetes. Recently, a research team from Pohang University of Science and Technology (POSTECH) developed technology that allows diagnosis of diabetes and treatment of diabetic retinopathy just by wearing smart light-emitting diode (LED) contact lens. With this technology, it the researchers hope to develop wearable diagnostic and therapeutic devices for diabetes.

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Fiber Optic Sensors for Aerospace Applications

AS-3 Fiber Optics and Applied Photonics Committee
  • Aerospace Standard
  • AIR6258
  • Current
Published 2020-01-30 by SAE International in United States
This document is intended to describe technologies available, application needs, and operational requirements relating to the use of fiber optic sensing systems on aerospace platforms: a To define standard terminology used in describing fiber optic sensing systems and their performance. b To identify current interfaces used for fiber optic sensing systems. c To define environmental, reliability, and maintainability capabilities of fiber optic sensing system components. d To describe the fiber optic sensor and instrumentation technologies that forms the current state of the art. e To describe current and future unmet needs of the aerospace industry for measurements using fiber optic sensors.
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Daytime visibility aspects under alternative use of headlamps

ARTEB-Carlos Alberto Leite de Moura
PRIME ONE-Paulo Victor S. Pingueiro
  • Technical Paper
  • 2019-36-0072
Published 2020-01-13 by SAE International in United States
Daytime visibility represents one of the most important themes in automotive safety. Some accidents, especially frontal collisions, used to occur as a result of a bad recognition of vehicle presence. In order to keep vehicles more visible during the day, there is a luminous device called Daytime Running Lamp (DRL). Nowadays DRL is not mandatory in Brazil, but it will be in 2021 for new vehicles. As with any situation that involves technological transitions, some questions appear, among them: how to equalize the market, in terms of daytime visibility, considering newer and older vehicles together? How to improve visibility in older vehicles that were not designed with DRL? The answer maybe lies in the alternative usage of automotive headlamps. Among other facts, one luminous device for two functions can result in safety improvements without unexpected investments. Therefore, how can this technically be achieved? By CONTRAN 667, that has adopted North America references, including luminous devices according to FMVSS, it is possible to use a low beam or a high beam dimmed to a maximum 7000…
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