A bus type road signal system based on carrier communication and its working method

Abstract

The invention discloses a carrier wave communication-based bus type road signal system and a working method thereof. The carrier wave communication-based bus type road signal system comprises an annunciator, standard alternating current power supply cables and N signal lamps, wherein N is a natural number; the annunciator is provided with a port A and a port B; the standard alternating current power supply cables start from the port A and return to the port B after passing through the N signal lamps, the port B is electrically communicated with the port A, communication signals are isolated, and then an annular link is formed; the annular link receives outside power supply through the annunciator. The carrier wave communication-based bus type road signal system uses a special wiring mode, all the components on the annular link take power from the link, the annular wiring mode guarantees the double-wire redundant power supply for each node, the system can still supply power normally if one point occurs a wire break fault, when many points occur the wire break fault, one part of the equipment can supply power normally; and meanwhile, based on the power supply link, the communication double-wire redundancy of each node is guaranteed through a special communication mechanism and mode, the system reliability is reinforced, and the system can continue to work when the physical link goes wrong.

Description

technical field [0001] The invention relates to a bus type road signal system based on carrier communication and its working method. Background technique [0002] The existing road traffic signal control system mainly includes peripheral equipment such as signal machines, signal lamps, and countdown boards. Other optional equipment includes: vehicle detectors, wireless data transceivers, etc. [0003] At a standard intersection, each direction is generally set up a row of left and right; red, yellow and green have a total of 9 (3*3) signal lights, and 4 directions have 36 (4*9) signal lights, plus 4 There are (4*2)8 pedestrian lights in the direction, and there are a total of 44 (36+8) lights that need to be controlled. Usually, these signal lights are directly connected to the signal machine with cables, and the signal machine controls the signal light by supplying or disconnecting the power supply. The main disadvantages are: [0004] 1. The cost of raw materials such as...

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Problems solved by technology

[0004] 1. The cost of raw materials such as cables is high: From the above principles, each signal light needs to be connected directly from the signal machine. In addition, it is impossible to lay cables at intersections in a straight line in reality, resulting in a huge demand for cables at intersections. According to the actual calculation of the project, the number of cables required at a general intersection is more than 500 meters (8 or 10-core cables), and the cost is about 6 to 7,000 yuan

[0005] 2. The construction is difficult: due to the large number of cables, the amount of threading at the intersection is large; and because the wire ends are concentrated at the signal machine, not only the amount of wiring is large, but also the corresponding relationship needs to be found, which makes the wiring work laborious and laborious

[0006] 3. High failure rate: Based on the inherent characteristics of the existing system, such as high hardware complexity, many cable connectors, and long wiring, it is prone to failure in actual use.

[0007] At the same time, in actual use, there have also been faults such as short circuit and open circuit in the cable due to construction, rat bites and other reasons.

What's more, sometimes there is signal crosstalk, causing traffic accidents and other problems

[0008] 4. Difficulty in maintenance and finding problems: Due to the large number of cable connectors and long lengths, it is difficult to change the wiring on the one hand, and the complexity of troubleshooting is high on the other hand.

[0009] 5. High maintenance cost: due to the many and long cables, once a failure occurs, the cost is high

In addition, in engineering practice, one signal often fails. Due to factors such as cable multiplexing and intertwining, it often needs to be completely replaced and rewired.

It not only requires a lot of materials, but also consumes a lot of manpower and material resources, and has a great impact on the traffic at intersections.

[0010] In order to solve the above problems, people have also developed a signal system based on wireless communication, but due to the randomness and complexity of wireless signal interference, it is difficult to apply in road signal control, which requires high safety, reliability and high real-time

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