Research on an automotive LED headlight adaptive control method based on nonlinear compensation

In response to the nonlinear characteristics of light-dependent resistors (LDRs) in vehicle headlight control, this study proposes an adaptive control method for automotive LED headlights based on nonlinear compensation of LDRs. By mathematically modeling the output characteristics of LDRs, a linear conversion model between resistance and illuminance is established, effectively addressing the traditional issues of insufficient sensitivity at low illuminance and response saturation at high illuminance. The system adopts PWM (Pulse Width Modulation) dimming technology to achieve stepless brightness adjustment of LED headlights within the 20–1,000 lux illuminance range, supporting 256-level precision control with a duty cycle range of 10–90%. Experimental results demonstrate that the system successfully converts the nonlinear output of LDRs into linear signals, significantly improving the accuracy of light intensity detection. This provides a feasible engineering solution for low-cost, high-precision automotive adaptive headlight systems.