Distributed traffic signal phase difference control structure and adjustment method

The invention provides a distributed traffic signal phase difference control structure and a phase difference adjustment method. Two functions of phase difference optimal computation and phase difference adjustment are separated, the phase difference optimal computation is completed by a central computer, the phase difference adjustment relevant to the state of each road junction is completed in a local road junction traffic signal controller, a phase difference adjuster is internally installed in each traffic signal controller, a phase difference generator of the central computer figures out target phase difference of each road junction, then the phase difference generator sends each target phase difference to the traffic signal controller of each road junction, and the traffic signal controllers of road junctions concurrently perform phase difference adjustment computation according to the current phase differences. The distributed traffic signal phase difference control structure and the phase difference adjustment method have the advantages that the central computer can be concentrated on acquisition of optimal phase difference, the phase difference generating algorithm can be carefully selected and optimized, the computing power of numerous road junction controllers can be fully utilized, and simultaneously the autonomous decision-making and autonomous control capabilities of road junctions are enhanced.