Application of Fuzzy Control to A Road Tunnel Lighting System

This paper deals with the serious problems of lighting system in a road tunnel. The lighting in a road should provide "safe driving conditions" on entry to the tunnel for all values of "open-road" luminance whilst obtaining maximum economy in capital, operating and maintenance costs. The recommendation by Commission Internationale de I\´Eclairage (CIE) on luminance of different lighting zones in a road tunnel is introduced at first. Then, prior to designing the fuzzy control model, a configuration layout of the lighting system including luminance sensing node, traffic sensing node, lamp control node is constructed. Based on the layout that offers the assignment of sensing nodes and control nodes, a fuzzy logic control model is developed. Membership functions of quantity of vehicles passed per hour and velocity of traffic flow are physically submitted in order to setup the fuzzy logic rules. Timing and spacing filtering in terms of weighting approach is employed in traffic information process in front of fuzzy control logic. The weight of filters is controlled by a so called "zone deduction logic", which also be used to select the luminance calculation equations