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    This study optimizes vehicle headlight optics for ECE R123 regulations, enhancing passing and driving beams. Novel reflector designs achieve superior luminosity and precise light distribution for improved road safety.

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    Area of Science:

    • Automotive Engineering
    • Optical Design
    • Photometry

    Background:

    • Vehicle lighting regulations, specifically ECE R123, dictate precise light distribution requirements for passing and driving beams.
    • Current headlight designs often involve energy-wasting shielding structures.
    • Optimizing optical microstructures is crucial for meeting performance standards and improving energy efficiency.

    Purpose of the Study:

    • To design and optimize optical microstructures for vehicle passing and driving beams according to ECE R123 regulations.
    • To develop a visor-less reflector design for passing beams to reduce energy waste and enhance luminosity.
    • To optimize the driving beam's light distribution using total internal reflection (TIR) lenses and response surface methodology.

    Main Methods:

    • Superimposing multiple light patterns using reflectors for passing beam design.
    • Employing a structural design method for reflectors to create a cutoff line without a visor.
    • Utilizing total internal reflection (TIR) lens design and response surface methodology for driving beam optimization.
    • Optimizing parameters like radius of curvature, lens thickness, and single lens length.

    Main Results:

    • The passing beam design meets four light types (Class C, V, E, W) with a maximum luminosity of 75,980.7 cd and a simulated maximum photometric value of 69,705.9 cd under Class W.
    • The driving beam design, optimized via response surface methodology, achieves a maximum central brightness of 213,866 cd.
    • Optimal driving beam parameters include specific radii of curvature (14.99 mm X, 25.22 mm Y), 1.5 mm thickness, and 2.43 mm single curved surface length.

    Conclusions:

    • The developed optical microstructure designs effectively meet ECE R123 requirements for both passing and driving beams.
    • The visor-less reflector design for passing beams significantly reduces energy waste while achieving high luminosity.
    • The optimized TIR lens design for driving beams enhances brightness and allows precise control over light distribution width and flatness.