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Viewing 1 to 30 of 237
2011-04-12
Technical Paper
2011-01-0108
Rainer Neumann, Thorsten Warwel
Due to the general requirements in the automotive industry to reduce the power consumption, fuel consumption rate and CO2 emission a new HID (High Intensity Discharge) bulb with only 25W is under development for front lighting systems. A first headlamp integrated in a hybrid vehicle is now launched as a first application in the market. The current regulation in ECE allows to get rid of the mandatory headlamp cleaning system and the automatic leveling requirement once the 25W HID bulb is applied. The reason for this is the objective luminous flux of the 25W HID bulb, which emits less than 2000 lm, a boundary defined in the regulation, where a headlamp cleaning and an automatic leveling is requested. That simplifies especially the integration in smaller vehicles and electric and hybrid vehicles. The paper describes the special design of the headlamp, the projector unit, the light performance, packaging advantages and future outlook of further applications in the near future.
2011-04-12
Technical Paper
2011-01-0109
Flavio Cimolin, Michele Rabito, Andrea Menotti
A complete methodology for the thermo-mechanical analysis of optical devices for the automotive industry is presented. The objective is to predict the thermal field all over the lamp, highlighting the zones with risk of melting, and the deformations and stresses associated with it. The proposed approach is based on a Computational Fluid-Dynamic (CFD) simulation capable of capturing all the heat transfer phenomena occurring inside and outside the lamp: conduction between different components of the device, natural convection associated with density changes in air (buoyancy effects), and radiation heat transfer. The latter requires a fairly complex modeling strategy in order to provide a satisfactory (and conservative) treatment for the source of power, i.e. the filament, which can be obtained by means of a proper inclusion of transparency.
2011-04-12
Technical Paper
2011-01-0116
Josef Schug
Today, LED automotive exterior lighting is already widely used on high end and upper middle class vehicles. We see already first examples of application as the standard lighting solution even in the mid class segment. A compact design and the feasibility of car life sealed solution is a strong argument to use LEDs for CHMSLs. Long lifetime and new styling opportunities speak for LEDS in front or rear position lights as well as in daytime running lamps;. Mainstream penetration of LED lighting solutions will first happen for functions where the benefits of LEDs have the highest positive impact and where this value can be realized in the most cost-effective way. During the different phases of the introduction of LEDs different requirements dominate the decision process. Providing unique styling opportunity and showing advanced technical functionality is leading for the early adopters.
2011-04-12
Technical Paper
2011-01-0114
Lawrence M. Rice
Light emitting diode (LED) modules (standardized light sources) for use in automotive illumination design will soon become available in production volumes. Designing products with these devices is not the same as working with conventional tungsten halogen or high intensity discharge (HID or Xenon) light sources. There are a number of LED module characteristics which must be kept in mind when designing lighting systems.
2011-04-12
Technical Paper
2011-01-0111
John D. Bullough
Photometric performance specifications for vehicle headlamp specifications in North America are given in terms of luminous intensity values at various angular locations with the objective of providing sufficient illumination for forward visibility while controlling for glare toward oncoming and preceding vehicle drivers. Abundant evidence suggests that luminous intensity is an appropriate metric for characterizing the degree to which a headlamp can produce disability glare through veiling luminances under a wide range of viewing conditions. Notwithstanding that discomfort glare exhibits a differential spectral sensitivity from the photopic luminous efficiency function used to characterize light, luminous intensity does not always predict discomfort glare. For example, the luminance of the luminous element(s) can be more predictive of discomfort when headlamps are viewed from relative close distances.
2011-04-12
Technical Paper
2011-01-0118
Daniel Le Messurier, John S. Orisich
Monte Carlo simulations are shown to be a useful tool when determining the flux output of LED arrays during the design phase. The results of Monte Carlo simulations are able to show the statistical distribution of output flux based on multi-LED arrays, thus allowing engineers to optimise their design, rather than using worst case scenario design principles.
2011-04-12
Technical Paper
2011-01-0117
Sidharth Gupta
This paper will present the method for activation of exterior and interior lighting system during the vehicle level fault conditions i.e. light switch failure, wiring harness faults, ignition switch failure etc. with intelligent light sensor. In vehicle the user safety is very important and exterior lighting system is playing a very important role during night driving condition. By considering the customer safety during any fault conditions i.e. light switch failure, wiring harness faults or any other faults condition the vehicle exterior and interior lighting system should not be switched off.
2013-09-24
Technical Paper
2013-01-2390
Aravindan V, Rejith Raj, Prashanth Moni, Gopisankar T, Vinamra Jain
The present invention relates to automobile headlamps, to be more precise static bending lamps. It is well experienced that driving at night times can be quite hectic as the ordinary headlamps do not trace the trajectory of the vehicle. This brought the idea of bending lamps; two different approaches have evolved for the same functionality, either to turn the light source or a projector, called dynamic bending and the second approach is to provide a secondary lamp at the corner focusing location for fulfilling the purpose. The present systems rely on the steering wheel sensor and the vehicle speed data for control. This requires the system to have a CAN transceiver module adding to the cost. In this paper, we will be focusing on static bending lamp in which the fixed-focus positioned lamp will be used for lighting the required area, moreover this gives design a more robustness and cost beneficial control system for the static bending lamp.
2014-04-01
Technical Paper
2014-01-0435
Luciano Lukacs, Mahendra Dassanayake, Iuri Pepe
Abstract Nighttime driving behavior differs from that during the day because of unique scenarios presented in a driver's field of vision. At night drivers have to rely on their vehicle headlamps to illuminate the road to be able to see the environment and road conditions in front of him. In recent decades car illumination systems have undergone considerable technological advances such as the use of a Light Emitting Diode (LED) in Adaptive Front-lighting Systems (AFS), a breakthrough in lighting technology. This is rapidly becoming one of the most important innovative technologies around the world within the lighting community. This paper discusses driver's needs given the environment and road conditions using a survey applied to compare the needs of both truck and car drivers under different road conditions. The results show the potential and suitability of the methodology proposed for controlling truck-related lighting in any emergent market.
2013-04-08
Technical Paper
2013-01-0753
Al Bolander, Timothy Brooks, Peter Thompson
In support of the Department of Energy ( DOE) "SuperTruck" program, a group of low energy, high output light emitting diode (LED) lamps were developed for forward lighting. Reduction of the energy needs of the truck by saving fuel and reducing CO₂ emissions are two of the goals of this program. In support of the energy reduction, a retrofit LED headlamp was designed, built and tested. The retrofit headlamp was switched from a halogen bulb to an LED-based system. The LED headlamp requires a new approach in heat management. The use of the LED, which is a 2π source, requires a different strategy in the optics from those used with a 4π source, like a traditional incandescent, halogen, or High Intensity Discharge (HID) light source. A thermal management system is necessary to facilitate the long life of the LED source. A unique method for removing the heat of the LED and maintaining an acceptable temperature was tested and reported.
2010-10-06
Technical Paper
2010-36-0039
Luciano P. Lukacs, Cristiano Fontes, Marcelo Embirucu, Iuri Muniz Pepe
Nighttime driving behavior differs from that during the day because of differences in the driver's field of view. At night, drivers must rely on their vehicle headlamps to illuminate the roadway. It is essential then that the driver is able to see the environment and road conditions in front of him. This paper presents the needs of the driver's (car and truck) due to the environment and road conditions from the state of Sao Paulo (Brazil). A survey has been done to compare the needs from the truck and car driver under different road conditions. The results show the necessity to tailor the beam pattern according to the driver needs, providing safer nighttime driving according to the driver's and market needs.
2015-04-14
Technical Paper
2015-01-1700
John D. Bullough
Abstract Warning lights and beacons on service vehicles such as maintenance trucks, tow trucks, utility service vehicles and delivery vehicles are an important line of defense for the workers who operate them. These flashing lights can also contribute to visual chaos making it difficult to navigate through a work zone location. Research on the flashing configuration and spatial and temporal coordination of warning lights that could adapt to ambient conditions and situations is described, leading to recommendations for preliminary performance specifications
2015-09-29
Technical Paper
2015-01-2867
Sanket Pawar
Abstract Work lights with high power rating consume high current. Since the battery voltage is fixed, high currents are needed to generate the necessary power (wattage). This makes it difficult to manage the load on the Electronic Control Unit (ECU) responsible for controlling the work lights and also on the entire electrical system of the vehicle. It is possible to prevent the system from getting over loaded by employing effective means of work light control techniques. These techniques differ based on the type of work lights connected on the vehicle. There are three types of work lights available in the market. Halogen work lights, High Intensity Discharge (HID) work lights and Light Emitting Diode (LED) work lights. HIDs are not preferred by most customers due to their high warm up times & cost/unit. The other two types of lights, i.e. LED & Halogen, are comparatively less expensive. They also need negligible warm up times which are not objectionable to the vehicle operators.
1992-11-01
Technical Paper
922445
Ralph A. Ehrhardt
In the past, the heavy duty truckers have been able to purchase sealed beam headlamps for the trucks using either a 2 round system or the 4 round system, with longer design life low beam filaments. In the '80's, many of the new truck models use rectangular sealed beams, however, these sealed beams were only available in the standard automobile life design. Truck operators noted the increase in replacement frequency and the additional costs related to the rectangular sealed beams. This paper covers the research, development and testing of the long life halogen sealed beam headlamps in the last several years. The final results of field testing are not yet completed, as only two filament failures have been reported after 19 months of use on heavy duty trucks.*
2000-12-04
Technical Paper
2000-01-3491
Beth Mooney, Craig Haehn
Field research has shown that reduced visibility plays a significant role in night time accidents putting both commercial vehicle operators and passenger vehicles at risk when driving after dark. Glare from on-coming headlights or dim lit roads can hide road hazards like construction detours, deer and other large animals, cars or pedestrians off to the side of the road, and up-coming curves. Our solution to this problem is to restore daytime like visibility to the driver and increase the reaction time a driver has to negotiate through a developing situation in front of the vehicle. To accomplish this, Bendix is offering an infrared thermal imaging system, XVision, that consists of a camera (which incorporates a ferro-electric sensor), and a compact head up display (HUD) co-developed with Raytheon Commercial Infrared especially for use in commercial vehicle applications.
2015-12-01
Magazine
Uncertainty quantification The technique is a must for next-generation simulation tools. Oil-pump sizing Researchers from Hinduja Tech investigate options for low friction and power consumption. The future of Indian commercial aviation The growth in traffic that airport modernization has supported has also made a significant contribution to the local and national economies, while the improved infrastructure has been positive for the perception of India in the global market. Driving EVs toward lower cost The race ison to reduce battery and electric-drive systems cost while improving efficiency. Powering on Rolls-Royce's Chief Engineer discusses new technologies that inspire current R&D design and evaluation work as part of its strategic roadmap for future big commercial programs. HMIs extend beyond the cab Telematic functions are being integrated into multi-function user interfaces.
1998-11-16
Technical Paper
982778
M. Holz, E. Weidel
A demonstrator for a vision enhancement system to be used at night has been developed and tested. The intention of the system is not to drive a vehicle using a small video image but to inform the driver early and far reaching about the course of the road and about obstacles, pedestrians and bikers. For the first time laser diodes emitting in the near infrared are applied as light sources in additional headlights. As a camera a low noise CCD video camera is used. The information in the video image is better than the information, which the driver can see with his eyes. To present the video image to the driver, a LCD display with an optic to generate a virtual image in a distance of some meters is used. The demonstrator was tested by 20 truck drivers resulting in a good acceptance of the system. Prototype development to implement an improved system into a bus is under way.
1984-04-01
Technical Paper
840763
A. U. Sulijoadikusumo, J. J. Hartmann, A. C. Beradino
CAD/CAM has been implemented at AT&T Consumer Products to improve the efficiency of data flow from design concept to manufacturing of the product. CAD/CAM has enhanced conceptual design and engineering processes, reconfigured product documentation, improved prototyping methods, and changed the interface to manufacturing. There are three interconnected turnkey CAD/CAM systems at AT&T CP-IN. The engineering system serves the engineer as a scratch pad for producing conceptual design and analysis, and is also used for “beta-site” testing of the complete CAD/CAM system for enhancements and for evaluating future technology. The second system resides in the Engineering Information Department and is used for design documentation and modeling. The manufacturing system is used to transpose design information for manufacturing, inspection, and quality control.
1984-08-01
Technical Paper
841050
Bernard R. Weber
The responsibility of design and/or manufacturing engineers in the performance of their work to minimize the possibility of becoming involved in a product liability suit is discussed from the viewpoint of a professional engineer, not an attorney. Procedures for fully documenting design and production data are discussed with suggested chronological steps for recording and filing information applicable to an original design of a product and subsequent changes made therein. The scope of the paper encompasses discussion of the necessity for accurate and complete documentation, safety considerations, conduct of an engineer when his deposition is being taken and his relationship to his attorney. Emphasized is the vital importance of documentation to the corporation's attorney when he is preparing the defense against a lawsuit.
1984-08-01
Technical Paper
841052
Charles A. Blixt
This article outlines the engineer's role in the litigation process from the point at which the designer first begins his design work through each stage of the design and litigation process. It includes a discussion of the creation of documents by engineers, the considerations engineers should have in balancing alternative design considerations and includes a brief discussion of the engineer's testimony by deposition and at trial.
1988-10-01
Technical Paper
881834
Mona A. Carver, R. Franklin Josey
The Canadian government has announced a new regulation, effective December 1, 1989, for Daytime Running Lights to be installed in all vehicles manufactured for use in Canada. There are several ways to design a system to meet the intensity requirements of the regulation, either as separate lights or combined with the existing lighting system. This paper will discuss the rationale behind Daytime Running Lights as well as some of the relevant issues to be considered when designing such a system for heavy-duty trucks.
1984-09-01
Technical Paper
841110
S. N. Chen, Y. G. Bian
Split torque and split speed drives are analyzed with Transmission “Functions representing speed relation between input and output derived using pump-motor displacement ratio as controllable variable. Variation of hydraulic, mechanical horse power shares and circulation with such a ratio is studied. Influence of mechanical and volumetric efficiencies of hydraulic branch on the over-all efficiency can be shown in a mathematic formula which indicates that hydro-mechanical drive has an efficiency up to 10% higher than purely hydraulic transmission as verified by experiments.
1984-09-01
Technical Paper
841097
Richard W. Bixby
For a growing number Friday is the day employees clear out their desks and move to a new job in a new organization. In many cases a result of unclear career orientation leading to frustration and dissatisfaction with their present status. Excessive attrition is expensive. This presentation will focus on a simple, visible communication tool HRD personnel and company supervisors can use to help subordinates access personal strengths and weaknesses, understand feedback on present performance, gain insights into the organizational structure, discover dysfunctional executions in the present work environment and match proper training with needs. First, we will examine a dual career path ladder and the resume base that supports both lateral and vertical career growth. Then we will explore why task performance and behavioral performance must be separated and how each can be used to help the employee prepare a plan for career development.
2000-12-01
Magazine
HID for both beams Automotive Lighting engineers have developed HID lighting for high-beam as well as low-beam functions. High-flux LED light sources Hella's advances in LED design provide new options for signal lights and styling variations for indirect lighting. Top 10 technologies for 2000 Readers have selected the most interesting technology stories appearing in Automotive Engineering International during the past year. The rankings are based on reader responses from feature articles and shorter technology items. Some of the stories appear here in shortened form. Synthetic diesel engine oil Researchers at ExxonMobil have developed an advanced lubricant for heavy-duty diesel engines. Disel Emission Control--Sulfur Effects The objective of this government-industry program is to determine the impact of fuel sulfur levels on emissions-control systems of diesel engines.
2001-12-01
Magazine
Concepts from Tokyo The Japanese brands showed an impressive number of concept vehicles at the 2001 Tokyo Motor Show, from styling exercises in search of what will come next, to "reference models" that are very close to production. Formula One technology: 2001 Engineering highlights of the recently completed season were the return of traction control, the widespread use of launch control, and the move toward wide V-angle engines. Adaptive front lighting Though there have been several early attempts at giving lighting systems some mechanical "intelligence," Hella believes the time is drawing near for the burgeoning capability of processors and sensors to play a significant role in enhanced frontal illumination. Instrument-cluster design trends Optrex America engineers show how automotive interior designers can use light to their advantage in designing displays for dashboard clusters.
2004-12-01
Magazine
Lighting goes digital Headlights move towards full integration with sensors, adjusting to turns and other driving conditions, while high-intensity discharge and light-emitting-diode technologies see continued growth. 2004 technology in review AEI editors look back at some of the most significant engineering and innovation stories of the past year. The age of digital experience SAE 100 Future look: Automotive historians will remember the beginning of the 21st century as a defining moment in the history of an industry. Simplifying advanced computing SAE 100 Future look: There is no doubt the world is changing. Global competition and sourcing, cost pressures, safety, and environmental concerns are just a few evolving realities facing the automotive industry today.
2003-12-01
Magazine
Concepts from 2003 Tokyo Motor Show Environmental, safety, and information technology were strongly emphasized in an impressive array of fuel-cell, hybrid, and pure electric concept cars. LEDs shine on The lighting technology's compact size, power, and durability excite designers who still long for flexibility in interior and exterior styling. GM, software, and electronics At its annual media preview of new models, the company demonstrated how its technology investments will pay off in more features, for more people, in more market segments. Plastics roll into new territory From structural members to Class A surfaces, plastics continue to find increasingly broad application in the automotive industry. 2003 technology in review AEI editors look back at some of the most significant production-intent innovations introduced over the past year. Forging ahead in metal forming Crude though the means may have been, humans began making and shaping metal several millenia ago.
2007-04-01
Magazine
Spec Formula One The series is moving forward with new rules to reduce cost and make racing more directly relevant to road-car development. Adding foresight Radar and cameras will work together to help drivers avoid accidents. Lexus LS 460:AEI's Best Engineered Vehicle for 2007 The fourth generation of Lexus' global flagship sets new standards in engineering, technical innovation, refinement, and workmanship. Hot off the grid New interest in plug-in hybrids has sparked intense R&D in battery chemistries and systems integration. Digital developments Ever-improving computer-based tools are helping engineers complete more complex designs in shorter time frames with downsized staffs. Illuminating technology Sensor-linked lighting systems, automatic high-beam control, LED headlights, and brand-identifying cabin lighting are enhancing safety, convenience, and the feel-good factor.
2008-04-01
Magazine
LED-ing the way Headlamps using low-power semiconductors called light-emitting diodes have moved from concept to reality with recent production firsts, but challenges remain in taking the technology mainstream. High-value hybrids The drive to reduce hybrid vehicle cost while boosting efficiency has brought new attention to stop-start and mild-hybrid systems. Sustainability on a small scale Nanotechnology is a new battleground for fighting emissions and making vehicles more environmentally friendly. Sensors inside Suppliers are helping OEMs enhance interior comfort and convenience. CO2: The next big challenge This roundup of recent engineering developments highlights that cutting emissions does not have to mean cutting the fun. Clearing the air Emissions and fuel-efficiency issues emerge collectively as the top concern among engineers attending this year's SAE World Congress.
2006-04-01
Magazine
Lighting the way Exterior lighting systems are not just contributing to safety, they are also changing cars' styling. Sensing a change As sensor use grows, providing input for all sorts of functions, engineers are responding to the design challenges through standardization and shared use of signal output. Attacking hybrid cost Hybrid-electric vehicle costs must be slashed significantly for the technology to become mainstream. HEV developers reveal many routes in the cost-reduction crusade. Engineering with the enemy In a program devoid of bloodshed, General Motors and Ford codeveloped a new six-speed automatic that is key to both companies' future vehicle plans. The program managers explain why they'd eagerly do it again. Drivetrain advances Japan's leading companies have focused development on reducing size, mass, and cost.
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