A road traffic signal controller

Abstract

The invention discloses a road traffic signal controller, which comprises a main control board and a plurality of lamp driving boards, and the main control board and the lamp driving boards are connected by a counter synchronization link, a lamp group control link and a lamp state feedback link Three groups of communication links are connected; both the main control board and the light driver board are equipped with a single-chip microcomputer system, and the local counter self-increment function is realized through the respective on-board AC zero-crossing trigger pulse input; the main control board periodically transmits its own counter through low-latency broadcast communication Synchronized to the light driver board; the driving message sent by the main control board to the light driver board adds a delay counter value, and the light driver board switches the drive output at the same specified effective time point; the light driver board returns the light state detection of the main control board The message is added to the counter value of the detection time, and the main control board merges according to the set step size, and judges whether there is a green conflict according to the output logic after the merge and degrades the control. The above-mentioned method solves the problem that the drive output of each lamp driver board and the detection of the lamp state are not synchronized in the asynchronous communication mode.

Description

technical field [0001] The invention relates to a road traffic signal controller, in particular to a road traffic signal controller in which a main control board of a signal machine and a driving board work together through network communication to realize strict synchronization. Background technique [0002] Traffic signal controllers are widely used in urban road traffic management and are important facilities to improve road traffic efficiency and ensure traffic order and safety. Correspondingly, the reliability requirements of traffic signal controllers are extremely high, and abnormal conditions such as green conflicts, crashes, long-term full red or off lights, etc. must be absolutely avoided. Therefore, in the design of the traffic signal controller, it is necessary to focus on the synchronization of the drive output of the signal light group and the detection input of the signal light state, as well as the rapid degraded operation after an abnormality occurs. [000...

AI Technical Summary

Problems solved by technology

[0003] During the construction of signal machines, we often encounter the engineering problem that it is difficult to pass through the wires. However, traditional signal machines require the power drive wires of signal lights, such as live wires and neutral wires, to be directly pulled into the wiring inside the signal machine cabinet, which will inevitably increase construction costs. High, and even the situation of abandoning the construction in the end

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