date:2023-09-04 11:17:29
The control system of LED traffic lights is a system that uses electronic technology to control the working status and display mode of traffic lights. The control system of LED traffic lights is mainly composed of the following parts:
Traffic light controller: It is the core component of the traffic light control system, responsible for generating corresponding control signals according to traffic rules and real-time conditions, and sending them to traffic lights. Traffic light controllers can be implemented using different technologies, such as PLC, FPGA, microcontroller, etc.
Traffic light: it is the output part of the traffic light control system, which is responsible for displaying the corresponding color or pattern according to the signal of the controller, indicating the driving or stopping of vehicles and pedestrians. Traffic lights generally use LEDs (light-emitting diodes) as light sources, which have the advantages of energy saving, environmental protection, long life, fast response, and bright colors.
Transmission line: It is the connection part of the traffic light control system, which is responsible for transmitting the signal of the controller to the traffic signal light. Transmission lines can be realized in different ways, such as current loop, optical fiber, wireless, etc.
Sensors and detectors: are the input components of the traffic light control system, responsible for detecting information such as traffic flow, vehicle speed, and number of pedestrians at intersections, and feeding back to the controller. Sensors and detectors can be implemented in different technologies such as coils, radar, cameras, etc.
The working principle of the control system of LED traffic lights is:
The traffic light controller generates a corresponding control signal according to a preset program or algorithm, and sends it to the traffic signal light through the transmission line.
According to the received control signal, the traffic signal lights turn on or off the corresponding LED, displaying colors or patterns such as red, yellow or green.
Sensors and detectors collect relevant data according to the real-time situation at the intersection, and send it to the controller through the transmission line.
According to the received data, the traffic light controller adjusts or optimizes the control signal to suit different traffic demands.
Documenting the interfaces in a traffic-control system
Make the system boundary visible
Prepare a block diagram showing the power supply, controller, signal heads and any detectors or request units. Mark which items are included in the supply package and which belong to the existing installation. Add cabinets, communication equipment and supporting power components when they are part of the project.
For every connection, identify the relevant electrical or communication interface and the document that defines it. Terms such as “wireless control” or “detector input” describe a function but do not establish that two particular devices can work together. Confirm the proposed combination before procurement.
Define the handover information
Keep the approved equipment list, terminal drawing, configuration reference and operating instructions together. Identify the party responsible for programming, installation and commissioning. Where the project requires a particular response to a fault or loss of communication, include that requirement in the acceptance plan.
For future maintenance, record the installed model and revision for each major component. A replacement should be checked against these interfaces and the accepted configuration. This helps avoid a visually similar signal or controller being ordered without the information needed to integrate it correctly.
