b"Automotive | Engineer Innovationangle must be specified. Additional effects from the environment, such as the albedo effect, must also be taken into account. With this effect, the sun intensity on the observed object is increased locally by additional reflections from the environment.Further consideration must be given to transport and parking situations. Figure 4: Thermography (left) and simulation (right) Depending on the inclination of the road, higher or lower sun elevations must be described in a physicallyThermal analysis must also be considered. Figure 10 differentiated way. The validation ofReflector systems or lens modules canshows the focal points in relation to conventional light sources is discussedbe used in the design of frontthe solar elevation (y-axis) and solar first. Here a detailed CADheadlamps. Different approaches haveazimuth (x-axis). The yellow fields representation of the individualto be used for the thermal design. Inshow a temperature above the vicat components is important.reflector systems, the resultingtemperature, where a material Furthermore, the filling pressure, theconvective heat flow is definedadjustment must be made. With the noble gas identification and itsdecisively as the influencing variable.red fields the temperature is far above composition have an influence on theBased on this, a focal point analysesthe material resistance. Here, the result comparison (Figure 4).must be carried out for lens modulescomponent should be removed from that are caused by solar radiation. If, infocusing or the surface should be After successful lamp validation, weaddition, LED technology (Figure 8) isadditionally vaporized with aluminum designed a validation box (Figure 5) inimplemented for the lighting functions,particles.which the cover lens is variable.the focus is, among other things, on Depending on the light function,the heatsink design. Heatsink analysis with Design of different filter lenses andExperiments (DoE) corresponding light sources can now Sun-load analysis In the area of heatsink design there are be mounted. For a meaningfulThe influence of sun rays on thethe following main objectives. To use simulation, the temperature-dependentheadlamp system, which result inthe smallest possible heatsink mass and absorption coefficient must be takenfocusing (Figure 9) of the rays by lensat the same time not to exceed the into account in the material database. modules or reflectors, poses anjunction temperature of the LED or additional challenge to the design andkeep it as low as possible. As the LED The rear fog lamp from Opel Adam ismaterial selection of the surroundingtemperature increases, the optical shown in Figure 6 as a practicalcomponents. When defining the angleperformance decreases and the service example. ranges, the sun's height and azimuthlife is greatly impaired.69,4C41,0 64,158,9 40.9239,5 53,6 37,4248,443,133,1 32,3337,832,627,3Figure 5: Thermography (left), Simulation (center), and overall model (right)80,7C 78.6073,7 68.20C 70.6971,2C 66,6 62.7880,7C 59,6 75.23C 54.8763,1C 52,553,5C 45,5 63.02C 46.9639,7C 38,4 53.52C 39.0531,4 39.70C 31.1424,3 23.23Figure 6: Rear fog lamp OPEL Adam Figure 7: Thermography (left) and simulation (right)15"