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International Journal of Automotive Technology > Volume 19(5); 2018 > Article
International Journal of Automotive Technology 2018;19(5): 923-933.
doi: https://doi.org/10.1007/s12239-018-0089-x
Shin Hyun Park1, Byeong Uk Im2, Dong Kyou Park3
1Gwangju Institute of Science and Technology
2Seoul National University
3Korea University of Technology and Education
Adaptive Front-Lighting System (AFLS) is a system which assists driver's field of vision by automatically controlling its brightness and illumination angle to adapt various driving conditions such as climate, traffic, road changes and so forth. This paper aims to propose novel model-based PID gain design method to improve the performances of Dynamic Bending Light (DBL) module that change horizontal angle of a system by applying Brent-Dekker algorithm that finds the root of nonlinear function and implementing Nelder-Mead simplex algorithm to the system reduction process. Along with the linear system model-based control theory, motor dynamics were modeled with frequency response. Validation of the prototype resulted in having less than 3 % error from the simulation, where position initialization and the real-time status monitoring function is available due to the closed loop control which enables over 3 times faster response than the conventional open-loop system.
Key Words: Closed-loop control, AFLS (Adaptive Front-Lighting System), DBL (Dynamic Bending Light), Intelligent headlight control, PID control, Digital control, MCU, Fail-safe, Angle control, Headlamp, MATLAB/Simulink
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