b'Engineer Innovation | AutomotiveDRL/PO/Turn LED-GroupMATRIX-LEDMATRIX-LED Highbeam LowbeamDRL/PO/Turn LED-GroupHighbeam Lowbeam H7 H7Figure 8: OPEL Insignia headlight models - Matrix LED (top) and halogen version (bottom)First, the optical pre-dimensioning as well as the determination of the possible installation space takes place. With the help of the DoE method, setting and target variables can now be defined (Figure 11). In this example, a reference heatsink is used as a basis and determined and optimized using the DoE method. The reference heatsink has a mass of 115g with an LED junction temperature of 133C.Figure 9: Visualization of the focal point (simulation)The results are shown in Figure 12. Onthe system by the ambient air. It shouldexchange from the inside to the outside. the basis of this overview, the modeltherefore be noted that optimumHere, the coefficients of gas permeability with the lowest mass andconditions exist during production andand diffusion must be clearly defined for simultaneously low LED junctiontransport (Figure 14).the membrane model in the simulation. temperature is now considered for theIt is also possible to apply an anti-further development phase. Now the question arises; which controlcondensation varnish to the inside of the variables are available to manage theouter lens. The sorption properties must Condensation analysiscondensate behavior? be defined here. Based on these two The topic of condensate in headlamppossibilities, there should be sufficient systems is highly complex becauseSince headlamps require pressureair circulation within the headlamp many factors have an influence on thecompensation, conventional vents aresystem. These can be implemented by condensate behavior. However, afterused - these are positioned at coldervarious design measures of the the concept phase (Figure 13), it ispoints of the headlamp housing so thatindividual components. Figure 15 essential to set up an initial preliminaryan advantageous air exchange can occur.compares a real vehicle condensation simulation and evaluate the results. InAnother variant is the membranetest in a climatic chamber with a general, moisture is transported intosolution, which primarily allows antransient simulation. This test describes Temperature Zone3936333027Sun Altitude242118151296301512 963 0 -3 -6 -9 -12 -15 -18 -21-24 -27 -30-33-36 Concept Kick Off Styling Freeze Tooling Project timeSun AzimuthFigure 10: Focal points in relation to sun position Figure 11 Development process of heatsink16'