The Research Of Self-adjusting Dimming Control Technology For LED Lightplate Of Aircraft

To resolve the issue of manual dimming for lightplate lighting system in aircraft cockpit that increase pilot’s work loading, and not easily to precisely control the brightness of lightplate according to cockpit luminous environment, self-adjusting dimming technology of lightplate lighting system is in-depth studied. Key technologies including the layout of ambient light sensor, brightness curve model and LED drive design are realized. The research results for this thesis can be as reference in the designs of lightplate lighting of large and mid-size aircraft.’Digital self-adjusting dimming control system of lightplate has been proposed according to the requirements of lighting dimming methods for lightplate in conjunction with the defects of manual dimming mode. Based on this, the overall system architecture was established. Ambient light distribution in different areas was analyzed with SPEOS software based on Cockpit 3D model, arrangement of ambient light sensors was decided. Brightness dimming curve model was established according to visual ergonomics test for cockpit luminous environment and confidence interval analysis. Based on this, self-adjusting dimming control model was proposed, The background luminance is accurately measured with ambient light sensors, and based on luminance curve model, each lightplate illumination is computed, to realize self-adjusting of lightplate luminance combined with manual compensation and PWM dimming control technology, self-adjusting dimming effects of lightplate brightness is realized finally. At the same time, scheme design is completed for the engineering realizing of main system components, it can accelerate the rapid application transformation of research results.By simulation in Matlab/Simulink, adjusting parameters and performance assessment of algorithms and control strategies for self-adjusting dimming control system of lightplate is completed, and prove that self-adjusting dimming control system can realize the function of self-adjusting dimming, the requirements of self-adjusting dimming can be fully complied with, while the dimming fluctuations caused by ambient light disturbances can be effectively suppressed.