Browse Topic: Headlamps

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The Impact of Color Correlated Temperature (CCT) on Automotive Headlights Performance and Driver Perception2026-26-01301/16/2026
Automotive lighting has been evolved from simple incandescent lamps to advanced LED based AFS and ADB functions. These lighting play crucial role in road traffic enhancing better visibility and safety to driver as well as other road users. Today’s Automotive Headlights use different light sources viz., Halogen, HID (Xenon), LED, and Laser each emitting light at different correlated color temperatures (CCT), measured in Kelvin (K). Color temperature not only influences visibility but also impacts the amount and perception of glare experienced by other drivers. The study was undertaken to evaluate the effect of correlated color temperature of automotive headlamps on driver visibility and comfort during night driving conditions. The experiment was conducted in a controlled laboratory environment using headlamps with different CCTs ranging from 3000K to 6500K. Participants from various age groups and genders were involved to capture diverse perceptions. Studies confirm that both CCT and
Patil, Mahendra Govind, Kirve, Jyoti Kirve, Parlikar, Padmakumar
"Addressing Reflection-Related Issues in Vehicle Interiors: Ensuring Safer and More Comfortable Driving Experiences"2026-26-05531/16/2026
Reflection significantly influences vehicle driving conditions, impacting both driver comfort and safety. Direct reflections from sunlight or artificial lighting can lead to stress, fatigue, and impaired road visibility, increasing the risk of accidents. Indirect reflections, such as glare from mirrors or dashboard surfaces, pose temporary challenges by distracting drivers and affecting their focus. The intensity and direction of reflections vary with the position of the sun during the day and artificial lights at night, creating visibility issues. Reflection is categorized into daytime reflection, characterized by sunlight-induced glare, and night reflection, driven by internal displays, headlights, and streetlights. To address this, our study focuses on design, vehicle interiors, colour and Pattern to mitigate the Reflection related issues. Our study also focuses on Innovative solutions like anti-reflective coatings, polarized accessories to minimize these effects, ensuring safer and
Jayapandiyan, Raja, DWARAPUDI, DURGAPRASAD, BALU, LAXSHMAANJI, Muthu, Karthikeyan, RANGARAJAN BHARATWAJ, Barath, Natarajasundaram, Balasubramanian
Transforming Headlamp Levelling Compliance Testing Through AI-Powered Predictive Modelling2026-26-06601/16/2026
The process of validating headlamp levelling compliance as per regulatory standards involves physical testing with various vehicle loading conditions. This traditional method is labour-intensive, time-consuming, and consumes significant resources. There is a need for a predictive solution that can simulate and validate headlamp levelling tests virtually, thereby reducing dependency on physical trials. Headlamp levelling compliance is a critical regulatory requirement to ensure optimal visibility and safety under varying vehicle loading conditions. This paper presents an Artificial Intelligence and machine learning-based (AI / ML) solution to simulate headlamp levelling tests virtually/Digitally by using Historical Headlamp designs from past vehicles. By leveraging historical test data and developing regression models, the system predicts headlamp height and dipped beam height for both unladen and laden conditions. Key vehicle parameters such as tire load, overhang, deflection, and
Mandloi, Prince, Joshi, Vivek S., GHANWAT, HEMANT, Ugale, Anand, Munda, Rohit, GHAN, PRAVIN
Thermal Management of An Automotive Headlamp2024-26-02861/16/2024
These days, the use of virtual simulations through Computation Fluid Dynamics (CFD) methodology is increasing exponentially during the development phase of an automotive headlamp. Thereupon, the automotive industries are becoming competent enough to build an ingenious and creative design with optimal performance within the coherent time. Considerable amount of heat is generated inside the headlamp when it is switched on for a longer time. Hence it becomes vital to reduce the risks if any during the development phase by providing an adequate thermal management strategy within the headlamp. The present study conducted an experimental analysis on an automotive headlamp to determine its thermal characteristics and behavior. Numerical analysis was also performed to determine the airflow and temperature distributions within a headlamp. This study also focuses on finding the main hotspot regions over the headlamp through virtual simulations. The methodology shows a consensus with the
Kolhe, Shailesh Madhukar
Design methodology for avoiding condensation in automotive head lamps2024-26-00831/16/2024
One of the important aspect to consider at the design stage is the condensation of water vapor inside the lighting system, under particular weather conditions of temperature and humidity, which may compromise the device functionality. Condensation of water vapor is an issue affecting functional and aesthetics of Head Lamp. The current paper analyses the process of water vapor condensation inside an automotive LED head lamp. This paper also discusses the design methodology to avoid condensation under particular conditions. Design methodology includes design considerations for better air movement for heat management, material selection, ease of moisture exchange, breather or vent selection, placement. Additionally, this paper would also discuss about effective use of simulations tools, test methods and assembly process guidelines to avoid impact due to condensation. This paper would consist of one example with application of above methodology, its test and field results.
RANE, SANDEEP BALU, Pawar, Nishant
Analysis of Detection Distances and Road Safety of Modern Headlamps under Variation of Aim and Performance2022-01-09603/29/2022
In addition to the low - and high beam functions, modern headlamps also have the option of switching on only a part of the high beam. The so-called adaptive high beam is intended to increase the detection distance of objects and by that drastically improve the road safety. At the same time this function does not increase the glare for oncoming or preceding traffic. This is enabled through switching on or off the different segments of the high beam, depending on which and where other road users are recognized by the front camera. This massively increases the use of the high beam thus increasing road safety. In this study, the increase in the detection distance of objects on a straight line is statically investigated with a test person study. Furthermore, the glare of each of these three light functions is investigated. A vehicle with adaptive high beam and an oncoming vehicle are statically positioned on the test track and the detection distances and glare sensitivity are determined
Hinterwaelder, Christian, Hamm, Michael, Kobbert, Jonas
Performance Requirements for Road Illumination Devices Using Light Emitting Diode (LED) SourcesJ2650_202104 (Current)4/14/2021
This SAE Recommended Practice is intended as a guide toward standard practice and is subject to change to keep pace with experience and technical advances. This document establishes additional performance requirements specifically for road illumination devices using light emitting diode (LED) sources.
Road Illumination Devices Standards Committee
Performance Requirements for Road Illumination Devices Using Light Emitting Diode (LED) SourcesJ2650_202104-TEST-REC (Historical)4/14/2021
This SAE Recommended Practice is intended as a guide toward standard practice and is subject to change to keep pace with experience and technical advances. This document establishes additional performance requirements specifically for road illumination devices using light emitting diode (LED) sources.
Road Illumination Devices Standards Committee
Vehicle-Specific Headlamp Mapping for Nighttime Visibility2021-01-08804/6/2021
Understanding when an object enters into the headlamp projection from a vehicle is useful to assist the driver in detecting the object in dark or nighttime conditions. Understanding the specific illumination pattern of a vehicle headlamp beam is useful for the evaluation of nighttime visibility issues in accident reconstruction. Determining when an object entered in the headlamp beam at a specific illuminance may be of particular importance to driver avoidance capabilities. Headlamp illumination patterns may be unique to each vehicle make and model. In this study, the headlamp illumination patterns of multiple vehicles were mapped, and the measured illumination distances were compared with empirical predications. In general, individual headlamp illumination distances fell within the range of minimum and maximum empirical predictions. However, the empirical relationships can have large standard deviations, which may influence the available time for the driver to detect and respond to
Funk, Charles, Petroskey, Karla, Arndt, Steve, Vozza, Adriano
Nissan reveals design study for next-generation Z sportscar20AUTP10_1310/1/2020
Giving hope to automotive enthusiasts that niche models will remain in at least some automakers' lineups, Nissan this week revealed the Z Proto, “signaling the company's intent to launch a new generation of the legendary Z sports car.” The production-intent Z Proto likely bears close resemblance to the production model that will replace today's 370Z, a model that has been little changed since its introduction in 2003 as the 350Z. “The Z represents the joy of driving in its purest form and has helped shape Nissan's DNA as a passionate, innovative challenger,” said Nissan CEO Makoto Uchida in a release coinciding with the Z Proto's unveiling. “Ever since the first generation, it has captured the hearts of car enthusiasts all over the world. That's why we're so excited today to be able to say to them: ‘Yes, the next one is coming!’” the CEO continued. He did not confirm when the new-generation Z-car will be in showrooms; some enthusiast media outlets indicate that will be in 2022.
Visnic, Bill
Headlamp CleanersJ2111_202008 (Current)8/26/2020
This SAE Recommended Practice provides test procedures, performance requirements, and guidelines for cleaners intended for use on motor vehicles.
Road Illumination Devices Standards Committee
Motorcycle and Motor Driven Cycle Electrical System Maintenance of Design VoltageJ392_202005 (Current)5/26/2020
This SAE Recommended Practice pertains to electrical systems of motorcycles both with and without batteries.
Motorcycle Technical Steering Committee
Front Fog LampJ583_202005 (Current)5/13/2020
This SAE Standard provides test procedures, performance requirements, design guidelines, and installation guidelines for front fog lamps.
Road Illumination Devices Standards Committee
Chromaticity Requirements for Ground Vehicle Lamps and Lighting EquipmentJ578_202004 (Current)4/29/2020
This SAE Standard defines and provides a means for the control of colors employed in motor vehicle external lighting equipment, including lamps and reflex reflectors. The document applies to the overall effective color of light emitted by the device in any given direction, and not to the color of the light from a small area of the lens. It does not apply to pilot, indicator, or tell-tale lights.
Lighting Standard Practices Committee
Influence of Background Spectral Distribution on Perceptions of Discomfort Glare2020-01-06374/14/2020
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
Nagare, Rohan M., Bullough, John D.
Innovative Bulb for Compact Headlamps Design2019-36-00661/13/2020
The Single beam reflector usage with H4 halogen bulb type is adopted in low cost emerging market countries that represent a very important segment for General Motors South America region. Currently, GM engineering tech centers have developed several different solutions for H4 halogen bulb reflector type that have their package, in terms of dimensions, to meet legal requirement and performance. Taking that into consideration, this new H19LL bulb development represents a great opportunity to find out an innovative new design with reduced mass and consequently cost reduction. Besides, it could allow enhancing reflectors portfolio as well as enabling Design Studio to better define customer driven theme for the vehicle appearance.
Cancino Junior, Israel João, Sônego, João Guilherme, de Souza, Raphael Nunes
Maintenance of Design Voltage - Snowmobile Electrical SystemsJ277_201909 (Current)9/25/2019
This SAE Recommended Practice provides test methods and requirements for maintenance of design voltage in snowmobile electrical systems. It pertains to both battery-equipped and battery-less systems.
Snowmobile Technical Committee
Halogen Light Source Performance Requirements for Motor Vehicle Forward LightingJ2560_201909 (Current)9/4/2019
This document establishes performance, material, and design requirements and design guidelines for halogen replaceable light sources used in road illumination devices for forward lighting. Non-halogen filament light sources suitable for forward lighting are specified in SAE J573. The terms “high beam filament” and “low beam filament” used throughout this document refer only to typical use, not to a mandatory, exclusive, or universal function of the filaments. This SAE Recommended Practice is periodically updated to keep pace with experience and technical advances.
Lighting Standard Practices Committee
Design of an Energy-Efficient Critical Angle Lens ReflectorTBMG-347687/1/2019
The critical angle lens reflector has commercial applications that supersede ordinary mirrored reflectors. The physics of the critical angle lens reflector are based on the optics principle of total internal reflection. Total internal reflection is characterized as follows: (1) as shown in Figure 2, the light rays are reflected off of the reflecting surface whereby the angle of reflection – with respect to the perpendicular to the reflecting surface – is equal to the angle of incidence of the ray, and (2) the reflection of the light ray takes place with no loss of energy upon reflection.
Glare Investigations and Safety Research on Digital Light Technologies2019-01-08494/2/2019
New human-machine interfaces are the direct result of digitalization. So also in lighting, new constellations have to be taken into account when looking to the possibilities of giving additional informations to the driver. Lighting and furthermore information given by light is a clear preference during nighttime driving. The global interest in standardization of light driven messages from autonomous vehicles to other traffic participants has opened new research needs in order to prepare full view on such new human-machine interface. In Europe, GTB (Group de Travail de Bruxelles) has established a working group dedicated to this topic. In order to provide a complete picture of the effects of digital light, the question of additional glare contribution by digital informations, i.e. extra projected light in form of patterns, symbols or areas was addressed in this research study. This article will show the investigations on wet and dry road glare while driving with digital informations
Hamm, Michael, Huhn, Wolfgang
Porsche reveals eighth-generation of fabled 91119AUTP01_151/1/2019
Regularly updating and evolving the Porsche 911's aesthetic signature might seem an impossible task. But more than half a century after its birth, the unveiling of the eighth-generation at the 2018 L.A. Auto Show demonstrated that it is in fact still a totally possible art-with design boss Michael Mauer the chief artist. Designated in-house as the 992 series and slightly larger than the outgoing 991, it is launched in rear-wheel-drive and all-wheel-drive forms-Carrera S and Carrera 4S-and now only in the wide-body width previously used for the Carrera 4 GT3 and GTS, instead of two body widths. Across the nose, the new 911 is 45 mm (1.8 in) wider than the outgoing version, a figure some 911 purists may look at askance, as growth in recent years has already been considerable.
Birch, Stuart
Function Performance Status Classification for EMC Immunity TestingJ1812_201809 (Current)9/13/2018
This SAE Standard provides a general method for defining the acceptable function performance status classification for the functions of automotive electronic devices upon application of the test conditions specified as described in appropriate EMC immunity test standards (for example, SAE J1113 and SAE J551). Testing of devices could be performed either on or off vehicles. Appropriate test signal and methods, Function Performance status, and test signal severity level would have to be specified in the individual cases.
Electromagnetic Compatibility (EMC) Standards
Reflex ReflectorsJ594_201806 (Current)6/19/2018
This SAE Standard provides test procedures, requirements, and guidelines for reflex reflectors.
Signaling and Marking Devices Stds Comm
Motorcycle Headlamp Distribution Comparison2018-01-10374/3/2018
The forward lighting systems on a motorcycle differ from the forward lighting systems on passenger cars, trucks, and tractor trailer. Many motorcycles, for instance, have only a single headlamp. For motorcycles that have more than one headlamp, the total width between the headlamps is still significantly less than the width of an automobile, an important component in the detection of a vehicle at night, as well as a factor in the efficacy of the beam pattern to help a driver see ahead. Single headlamp configurations are centered on the vehicle, and provide little assistance in marking the outside boundaries like a passenger car or truck headlamps can. Further, because of the dynamics of a motorcycle, the performance of the headlamp will differ around turns or corners, since the motorcycle must lean in order to negotiate a turn. As a result, the beam pattern, and hence visibility, provided by the headlamps on a motorcycle are unique for motorized vehicles. This paper measures the
Neale, William T., Mckelvey, Nathan, Pentecost, David, Koch, Daniel
New Osram IREDs enhance vehicle vision without harming human eyes18AUTP08_081/1/2018
As a compliment to cameras, LiDAR and radar, a new family of Infrared LEDs (IREDs) can expand the vision of SAE Level 4 and 5 autonomous vehicles without harming human eyes, claims maker Osram Opto Semiconductors. Infrared night vision cameras, LiDAR, radar, and vehicle headlights will provide autonomous vehicles with an ability to see the surroundings at night, but the technologies have limitations.
Buchholz, Kami
Lighting Identification CodeJ759_201712 (Current)12/20/2017
This SAE Recommended Practice provides the lighting function identification codes for use on all passenger vehicles, trucks, trailers, motorcycles, and emergency vehicles.
Lighting Standard Practices Committee
Dimensional Specifications for General Service Sealed Lighting UnitsJ3003_201711 (Current)11/16/2017
This SAE Recommended Practice provides dimensional specifications for the 41/2 and 53/4 inch general service sealed lighting units, intended for use in such applications as motorcycle headlamps, military headlamps, industrial machinery headlamps, fog lamps, spot lamps, etc. See Figures 1 and 2 and Tables 1 and 2.
Road Illumination Devices Standards Committee
Headlamp Aim Adjustment Deflection Analysis2017-36-007911/7/2017
It is common to see application of simulations to Support product development, being parts, sub-system or complete product, like a passenger vehicle. Another possible application of the simulation is to simulate assembly of parts and sub-systems. This paper captures one example of this application, where the headlamp aim adjustment done during the assembly line, is simulated to provide design changes to avoid issues during the normal production.
Junior, Israel João Cancino, Ramos, Roberto P, Lima, Alex Fabian Fragoso, Sales, Flávio Bréglia
Daytime Running LightJ2087_201708 (Historical)8/17/2017
This SAE Standard provides test procedures, requirements, and guidelines for a daytime running light (DRL) function.
Signaling and Marking Devices Stds Comm
High Performance LED Bi-function Module for Universal HID Replacement2017-01-13613/28/2017
In this study, we are presenting design considerations for the development of a LED (Light-Emitting Diode) bi-function headlight module to replace conventional HID (High-Intensity Discharge) projector modules for retrofitting or first installation purposes. The objective was to develop a projector-type module to outperform current 35 W HID light sources in both low beam and high beam, but with far less installation space. Essential features like multichip LED usage and the optical system design will be described in detail. Special care was taken for the heat management of the high-power LEDs, with optimization of the heat dissipation thermal path via printed circuit board, heatsink and active cooling by extensive Computational Fluid Dynamics simulation work (CFD). The achieved projector lumen output of greater 1300 lm in low beam and 2000 lm in high beam enables a projector module of very compact size (<1,200 cm3) to easily replace HID modules.
Chiu, Huan-Ping, Uhlenberg, Gerald, Wang, Alex, Yen, Jung Hsien
Development of High Efficiency Rectifier with MOSFET in “eSC Alternator”2017-01-12283/28/2017
Alternator, which supplies electric energy to a battery and electrical loads when it is rotated by engine via belt, is one of key components to improve vehicle fuel efficiency. We have reduced rectification loss from AC to DC with a MOSFET instead of a rectifier diode. It is important to turn on the MOSFET and off during a rectification period, called synchronous control, to avoid a current flow in the reverse direction from the battery. We turn it off so as to remain a certain conduction period through a body diode of the MOSFET before the rectification end. It is controlled by making a feedback process to coincide with an internal target conduction period based on the rotational speed of the alternator. We reduced a voltage surge risk at turn-off by changing the feedback gain depending on the sign of the time difference between the measured period and the target. In addition to reducing the rectification loss, reducing copper loss with low resistance coil winding and iron loss with
Nakanishi, Masaya
The Research of the Adaptive Front Lighting System Based on GIS and GPS2017-01-00413/28/2017
Automotive Front Lighting System(AFS) can receive the steering signal and the vehicular speed signal to adjust the position of headlamps automatically. AFS will provide drivers more information of front road to protect drivers safe when driving at night. AFS works when there is a steering signal input. However, drivers often need the front road's information before they turn the steering wheel when vehicles are going to go through a sharp corner, AFS will not work in such a situation. This paper studied how to optimize the working time of AFS based on GIS (Geographic Information System) and GPS(Geographic Information System) to solve the problem. This paper analyzed the process of the vehicle is about to go through a corner. Low beams and high beams were discussed respectively. Taking into account the characteristics of GIS, GPS and driving conditions, this paper researched that when the vehicle derived on the single lane or double lane, the feasibility of the steering side headlight
Xiong, Shengguang, Tan, Gangfeng, Guo, Xuexun, Xiao, Longjie
Apparatus and Method for a Light Direction SensorTBMG-263572/1/2017
This invention, developed at NASA's Goddard Space Flight Center, was originally conceived as a high-accuracy, high-sensitivity, bi-axial Sun angle sensor, but has also been proposed for applications involving the general field of precisely measuring the direction in which light travels toward the sensor. It has applications in spacecraft navigation, formation flying in space, space beacons, and automotive collision avoidance.
Case Study: An Accelerated Methodology for Simulating Thermal Stress in Automotive Headlamps2017-26-03221/10/2017
In any industry, early detection and mitigation of a failure in component is vital for feasible design changes or development iterations or saving money. So it becomes pivotal to capture the failure mode in an accelerated way. This theory poses many challenges in devising the methodology to validate the failure mode. In real world, vehicle head lamp is exposed to all possible kinds of harsh environments such as variable daily ambient, rain, dust and engine compartment temperature …etc. This brings rapid thermal stress onto headlamp resulting into warpage cracks. At vehicle level on particular model, this failure is typically observed after 20,000-25,000 kms in a span of 3-4 months of running. Any corrective action to revalidate the design change or improvement will need similar timelines in regular way to test, which is quite high in product development cycle. In this paper, we emphasize on accelerated test cycle to generate the failure mode within 12-15days on vehicle level test and 4
Kasinathan, Saktheeswaran, Gupta, Sreenivasa, Agha, Husain, Modi, Rajiv
Replaceable Motorcycle Headlamp BulbsJ1577_201611 (Current)11/15/2016
This SAE Recommended Practice provides performance parameters and dimensional specifications for available light sources (replaceable bulbs) which are appropriate for motorcycle headlamps.
Motorcycle Lighting Committee-SumanTest-SumanTest-SumanTest
2016 Create the Future Contest: Automotive & Transportation Category WinnerTBMG-2576511/1/2016
Krishan Arora, Mike Baker, Glenn Barber, Peter Brett, Ross Dewhurst, Melvyn Dover, John Gamston, Steven Goodier, Annie Leeson, Vincent Panel, Ben Russell, Alessandra Scotese, Oliver Taylor, Julian Von Thungen-Reichenbach-Evans, Chris Wilks, John Ward-Zinski, and Roy Williamson
Front Fog LampJ583_201609 (Historical)9/21/2016
This SAE standard provides test procedures, performance requirements, design guidelines and installation guidelines for front fog lamps.
Road Illumination Devices Standards Committee
439A Simulated Air Traffic Control Environments in Flight Simulation Training DevicesARINC439A-199/8/2016
This document provides guidance on provision of an SATCE system in Flight Simulation Training Devices (FSTD) for the benefit of flight crew training. This guidance recommends a more mature set of requirements, and provides commentary on system scope, currently available technologies, integration, qualification, and maintenance.
Daytime Running LightJ2087_201606 (Historical)6/3/2016
This SAE Standard provides test procedures, requirements, and guidelines for a daytime running light (DRL) function.
Signaling and Marking Devices Stds Comm
Next-gen electronic controls: Open source, scalable and integrated16MEIP06_106/1/2016
All trends point to rapidly increasing levels of vehicle electronics. That's forcing engineering managers to explore ways to consolidate hardware and improve software development while they adjust internal staffing and forge tighter alliances with customers and suppliers. A range of strategic and tactical changes were discussed by panelists during the session “Are Functions and Software Becoming More Important than Hardware in Vehicle Electronics Engineering?” during the 2016 SAE World Congress. They also took a few minutes to answer that question.
Costlow, Terry
A Quantitative Method for Accurately Depicting Still Photographs or Video of a Night-Time Scene Utilizing Equivalent Contrast2016-01-14634/5/2016
It is extremely important to accurately depict photographs or video taken of a scene at night, when attempting to show how the subject scene appeared. It is widely understood that digital image sensors cannot capture the large dynamic range that can be seen by the human eye. Furthermore, todays commercially available printers, computer monitors, TV’s or other displays cannot reproduce the dynamic range that is captured by the digital cameras. Therefore, care must be taken when presenting a photograph or video while attempting to accurately depict a subject scene. However, there are many parameters that can be altered, while taking a photograph or video, to make a subject scene either too bright or too dark. Similarly, adjustments can be made to a printer or display to make the image appear either too bright or too dark. There have been several published papers and studies dealing with how to properly capture and calibrate photographs and video of a subject scene at night. Most of these
Suway, Jeffrey Aaron, Welcher, Judson
Automotive LED Headlamp Defogging: Experimental and Numerical Investigation2016-01-02164/5/2016
Fogging (i.e. condensation of water vapor) in headlamps in severe weather conditions present both a performance and potential safety concern for automotive companies. Conventional headlamps are based on incandescent bulbs. In recent times, LED lighting has increasingly become the norm. However, LED based headlamps are prone to higher levels of fogging because they inherently produce less heat than the conventional incandescent or halogen bulbs. A headlamp design must be able to dispose all the formed condensate/fog in a fixed time even under severe thermal conditions. It is of great importance for the car manufacturer to be able to simulate the risk of condensation early in the design stage with an eye on the overall cost reduction. The combined use of experimental studies and numerical modelling is important to optimize headlamp design and to produce high-performance headlamps. Most of the available literature on headlamp defogging simulation is based, primarily, on 2D geometries with
Singh, Ramanand, Kuzhikkali, Remesh, Shet, Nitesh, Natarajan, Sekarapandian, Kizhedath, Govind, Arumugam, Murugan
Quantification of Headlamp Degradation Due to Exposure to the Elements2016-01-14714/5/2016
It is well known that older vehicles’ headlight assemblies degrade with exposure to the elements and can become cloudy or crazed. It is also known that the degradation decreases the amount of useful light projected forward, which can drastically reduce night time or down-road visibility. Testing has been performed to measure the available light projected by old degraded headlamp assemblies and new replacement assemblies, to quantify the decrease in emitted light caused by the degradation. The work has been extended to quantify the improvement in available light when the degraded lenses are treated with commercially available restoration products. Five different vehicle headlamp assemblies representing four different manufacturers were tested measuring the illumination at a given distance with a modified Extech® illuminance meter. The illuminance was mapped at various points spanning plus or minus 24 degrees horizontally and plus or minus 4 degrees vertically to examine the effect of
Timpanaro, Anthony, Moody, Charles, Richardson, Wesley, Reckamp, Bradley, Keifer, Orion
Modern Methods for Random Fatigue of Automotive Parts2016-01-03724/5/2016
Conventional approaches for the fatigue life evaluation of automotive parts like headlamps involves the evaluation of random stress conditions in either the time or frequency domain. If one is working in the frequency domain the fatigue life can be evaluated using one of the available methods like the Rayleigh (Narrow Band) approach or the more recent Dirlik method. Historically, the random stresses needed as input to these methods have been evaluated by the FEA solver (eg Abaqus, or Nastran) and these “in built” stress evaluations have limitations which relate to the fact that the stress conditions are complex and so the common “equivalents” for stress like von-Mises or Principal have not been available. There have also been limitations in the location and method of averaging for such stresses. In addition, the fatigue calculation approach for doing the evaluation has been constrained to the linear stress based (S-N) method. And finally, random methods implemented inside such solvers
Thesing, Thomas, Bishop, Neil
Deutz-Fahr tractor debuts industry-first Hella LED light package15MEIP12_1512/1/2015
Deutz-Fahr collaborated with Hella to develop an industry-first LED light package for its line of 7 Series tractors. The Deutz-Fahr 7250 Warrior is equipped with 14 new Hella Module 70 LED Generation IV worklights, which in addition to close- and long-range illumination also offer a special extra-wide illumination, allowing for homogeneous light distribution across the work area. The tractor is the first in the market to incorporate this latest-generation LED light package. For the first time, LED output is on par with that of xenon in this compact design, according to Stefan Maierhofer, the Worklights Program Manager at Hella Fahrzeugteile Austria GmbH, where the company develops and produces its worklights. Equipped with three high-performance multichip LEDs, the Module 70 LED is rated to 2470 lumen and consumes just 30 W of energy.
Gehm, Ryan
Development of Cost Advantageous Designs for Headlight System Using Light Emitting Diodes2015-32-075011/17/2015
So far, the application of LED headlights to the motorcycle has been limited for only high-priced models, because LED light units and the drivers are expensive. In our development, the cost reduction of light source units was examined by implementing multiple medium intensity LEDs. Distributed mounting scheme was created for LEDs placed on the circuit board to meet the heat dissipation requirement without a heat sink, which is usually installed. By new mounting scheme, the requirement of heat dissipation has been successfully fulfilled by only using the copper foil layer. Moreover, by connecting LEDs in series, the driver circuit configuration was made simple while separate circuits are generally required both for a high-beam and a low-beam. By this configuration, the driver cost was reduced. With this circuitry change, some associated issues arose and measures were devised to cope with them. In addition, the method of driver circuitry, established through applications for conventional
Tsuchiya, Yosuke, Matsuzaki, Teppei, Takeshige, Tetsuo, Oguchi, Tsuyoshi
Lighting Inspection CodeJ599_201511 (Current)11/5/2015
This code is intended only for the inspection and maintenance of lighting equipment on motor vehicles that are in use.
Road Illumination Devices Standards Committee
Rear Fog Lamp SystemsJ1319_201510 (Historical)10/28/2015
This SAE Recommended Practice provides test procedures, requirements, and guidelines for rear fog lamp systems.
Signaling and Marking Devices Stds Comm
Front Fog LampJ583_201510 (Historical)10/28/2015
This SAE standard provides test procedures, performance requirements, design guidelines and installation guidelines for front fog lamps.
Road Illumination Devices Standards Committee
System for Recirculation of Mobile Tooling2015-01-24949/15/2015
Aircraft assembly systems which require tooling or machinery to pulse or move between multiple positions within a factory can be positioned with high repeatability without high performance foundations or sweeping out large areas of floorspace. An example shows a system of large left and right-hand frames which are positioned at 3 sequential manufacturing steps and then recirculated to the start of production via a central return aisle. The frames are 41 ton actual weight and are 72′ long, similar to a rail car. The system achieves rectangular motion for the recirculation path. The supporting and moving system incorporates low-cost rail in a floor with minimal preparation and simple to use controls. The system is also easily reconfigured if the manufacturing system needs to be altered to meet rate or flow requirements.
Hempstead, Benjamen D., Smith, Scott
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