Bus control traffic signal lamp system
The bus-controlled traffic light system with a ring loop constructed using CAN bus technology solves the problems of complex wiring harnesses and difficult maintenance, and achieves simple wiring and rapid fault repair.
Patent Information
- Application Number
- CN202510862177.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-25
- Publication Date
- 2025-10-17
AI Technical Summary
The existing traffic light control method has complex wiring harness and is difficult to repair.
Using CAN bus technology, a ring loop is constructed through a signal machine converter, a dual-core CAN gateway and a signal light branch, realizing a bus-controlled traffic light system with fewer wires, simple wiring and easy maintenance.
It simplifies wiring, improves system reliability, facilitates fault detection and rapid repair, and saves cables and construction effort.
Smart Images
Figure CN120808623A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of traffic signal lights, and more particularly to a bus control traffic signal light system. BACKGROUND
[0002] The control method commonly used for traffic signal lights is that the output matrix cable of a signal machine is directly connected to the traffic signal lights at each intersection, and the corresponding traffic signal lights are directly controlled by the on-off of 220V alternating current in the cable. However, this traffic signal light control scheme has the problems of complex wiring of the wire harness and difficult maintenance.
[0003] In view of the above problems, there is an urgent need to design a bus control traffic signal light system with less wire harness, simple wiring and easy maintenance. SUMMARY
[0004] The present application provides a bus control traffic signal light system with less wire harness, simple wiring and easy maintenance, and controls the entire bus control traffic signal light system by CAN bus technology.
[0005] In a first aspect, the embodiments of the present application provide a bus control traffic signal light system, comprising: a signal machine converter configured to send traffic signal light control signals; a plurality of dual-core CAN gateways sequentially connected by a CAN bus, a first dual-core CAN gateway connected to a receiving end of the signal machine converter by the CAN bus, and a last dual-core CAN gateway connected to a sending end of the signal machine converter by the CAN bus to form a ring circuit; a plurality of signal light branches, each of which is connected to a corresponding dual-core CAN gateway by the CAN bus; Each signal light branch is configured to receive signals sent by the corresponding dual-core CAN gateway to control traffic signal lights.
[0006] In some embodiments, the signal machine converter includes a converter body, a first CAN interface and a second CAN interface provided on the converter body, the first CAN interface is a sending end, and the second CAN interface is a receiving end. The converter body is configured to control the first CAN interface and the second CAN interface to synchronously send signals when it is detected that the signals received by the second CAN interface are abnormal.
[0007] In some embodiments, the converter body includes a signal machine that outputs a signal light control matrix signal, a voltage converter electrically connected to the signal machine and used to convert the signal light control matrix signal into voltage, an optoelectronic isolator electrically connected to the voltage converter, and a signal processor electrically connected to the optoelectronic isolator, the first CAN interface, and the second CAN interface.
[0008] In some embodiments, the dual-core CAN gateway includes a gateway body, a third CAN interface and a fourth CAN interface provided on the gateway body; The third CAN interface of the first dual-core CAN gateway electrically connected to the receiving end of the signal converter is electrically connected to the second CAN interface, and the fourth CAN interface of the last dual-core CAN gateway electrically connected to the transmitting end of the signal converter is electrically connected to the first CAN interface; Among the remaining dual-core CAN gateways, the fourth CAN interface of one dual-core CAN gateway is electrically connected to the third CAN interface of another dual-core CAN gateway connected in sequence.
[0009] In some embodiments, the dual-core CAN gateway further includes a fifth CAN interface, and each of the signal light branches is electrically connected to a corresponding fifth CAN interface of the dual-core CAN gateway via a CAN bus.
[0010] In some embodiments, the traffic light branch includes a plurality of traffic light controllers electrically connected to the fifth CAN interface via a CAN bus, and a terminal resistor arranged at the end of the CAN bus, wherein each of the traffic light controllers is used to control a corresponding group of traffic lights.
[0011] In some embodiments, the dual-core CAN gateway includes a first processor and a second processor in bidirectional communication connection, both processors being electrically connected to the third CAN interface, the fourth CAN interface, and the fifth CAN interface; The two processors control each other to be in a conducting state or a high-impedance state.
[0012] In some embodiments, the first processor includes a first master isolated transceiver electrically connected to the third CAN interface, a second master isolated transceiver electrically connected to the fourth CAN interface, and a third master isolated transceiver electrically connected to the fifth CAN interface; The second processor includes a first slave isolation transceiver electrically connected to the third CAN interface and the first master isolation transceiver, a second slave isolation transceiver electrically connected to the fourth CAN interface and the second master isolation transceiver, and a third slave isolation transceiver electrically connected to the fifth CAN interface and the third master isolation transceiver.
[0013] In some embodiments, the first processor is configured to send a processor state signal to the second processor, and control the first slave isolating transceiver, the second slave isolating transceiver, and the third slave isolating transceiver of the second processor to be in a high-impedance state. The second processor is configured to receive the processor state signal, and when detecting an abnormality in the processor state signal, control the first master isolating transceiver, the second master isolating transceiver, and the third master isolating transceiver of the first processor to be switched from a conducting state to a high-impedance state.
[0014] In some embodiments, the third CAN interface and the fourth CAN interface are each electrically connected with a terminal resistor The bus control traffic signal lamp system provided by the application has less wiring harness, simple wiring, simple maintenance, and controls the entire bus control traffic signal lamp by using CAN bus technology. The wiring harness structure of the entire system only includes a CAN bus trunk loop and a CAN bus branch in each signal lamp branch. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 A structural block diagram of a bus control traffic signal lamp system is provided for an embodiment of the application. Figure 2 A structural block diagram of a signal machine converter is provided for an embodiment of the application. Figure 3 A structural block diagram of a dual-core CAN gateway is provided for an embodiment of the application. DETAILED DESCRIPTION
[0016] To make the objectives, technical solutions, and advantages of the embodiments of the application clearer, the technical solutions in the embodiments of the application will be described below in detail with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the application. In addition, the technical features in each embodiment or in a single embodiment provided by the application can be combined with each other at will to form a feasible technical solution. This combination is not restricted by the order of steps and / or structure mode, but should be based on the feasibility for those of ordinary skill in the art. When the combination of technical solutions appears contradictory or unfeasible, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope of the application.
[0017] The control method of the traffic signal lamp commonly used at present is that the output matrix cable of the signal machine is directly connected with the signal lamps of each intersection, and the corresponding traffic signal lamp is directly controlled through the on-off of 220V AC in the cable. This traffic signal lamp control scheme has the problems of complex wiring of the wire harness and difficult maintenance.
[0018] In view of this problem, referring to Figure 1 A block diagram of a bus control traffic signal lamp system provided by the present application mainly comprises a signal machine converter, a plurality of dual-core CAN gateways and a plurality of signal lamp branches.
[0019] The signal machine converter is used for sending a traffic signal lamp control signal; The plurality of dual-core CAN gateways are sequentially electrically connected through a CAN bus, the first dual-core CAN gateway is electrically connected with the receiving end of the signal machine converter through the CAN bus, and the last dual-core CAN gateway is electrically connected with the sending end of the signal machine converter through the CAN bus, so as to form a ring loop; Each signal lamp branch is electrically connected with a corresponding dual-core CAN gateway through the CAN bus; Among them, each signal lamp branch is used for receiving the signal sent by the corresponding dual-core CAN gateway to control the traffic signal lamp.
[0020] Therefore, compared with the signal machine output matrix cable directly connected with the signal lamp in the prior art, the bus control traffic signal lamp system provided by the present application has the advantages of less wire harness, simple wiring, simple maintenance and control of the entire bus control traffic signal lamp system by the CAN bus technology. The entire system only contains a CAN bus trunk of the ring loop and a CAN bus branch in each signal lamp branch. At the same time, each signal lamp branch can take the commercial AC 220V power supply near the intersection.
[0021] Referring to Figure 2 Optionally, the signal machine converter comprises a converter main body, a first CAN interface and a second CAN interface arranged on the converter main body, the first CAN interface is a sending end, and the second CAN interface is a receiving end; The converter main body is used for controlling the first CAN interface and the second CAN interface to synchronously send signals when it is detected that the signal received by the second CAN interface is abnormal. The function of synchronous signal sending is to prevent the CAN bus signal transmission problem by changing the condition of one end sending signal and one end receiving signal to the condition of both ends sending signal, so as to ensure that the bus control traffic signal lamp system can continue to work normally.
[0022] The converter body comprises a signal machine for outputting a signal lamp control matrix signal, a voltage converter electrically connected to the signal machine and used for voltage conversion of the signal lamp control matrix signal, an opto-isolator electrically connected to the voltage converter, and a signal processor electrically connected to the opto-isolator, the first CAN interface and the second CAN interface.
[0023] The opto-isolator is used for isolating high and low voltages, one end of the voltage converter is high voltage, and one end of the signal processor is low voltage, and if there is no opto-isolator, the components of the low voltage part will be damaged.
[0024] Under normal circumstances, the first CAN interface sends the traffic signal lamp control signal output by the signal processor, and the second CAN interface receives the signals transmitted through the plurality of double-core CAN gateways, and if the second CAN interface cannot receive the signals, it is indicated that the line of the CAN bus trunk at a certain point may be damaged, at which time the second CAN interface and the first CAN interface synchronously send signals together, and alarm the equipment maintenance personnel.
[0025] Referring to Figure 1 The double-core CAN gateway comprises a gateway body, a third CAN interface and a fourth CAN interface arranged on the gateway body. The third CAN interface of the first double-core CAN gateway electrically connected to the receiving end of the signal machine converter is electrically connected to the second CAN interface, and the fourth CAN interface of the last double-core CAN gateway electrically connected to the sending end of the signal machine converter is electrically connected to the first CAN interface. Among the remaining double-core CAN gateways, the fourth CAN interface of one double-core CAN gateway is electrically connected to the third CAN interface of another double-core CAN gateway connected in sequence.
[0026] Therefore, the first CAN interface and the second CAN interface of the signal machine converter are respectively connected to the third CAN interface and the fourth CAN interface of the double-core CAN gateway of each intersection through the CAN bus to form a closed ring CAN bus trunk in a hand-in-hand structure, the wire harness structure is regular, wiring is simple, and construction is also relatively simple.
[0027] Referring to Figure 1 The double-core CAN gateway further comprises a fifth CAN interface, and each signal lamp branch is electrically connected to the fifth CAN interface of one double-core CAN gateway through the CAN bus.
[0028] The signal lamp branch includes a plurality of signal lamp controllers electrically connected with the fifth CAN interface through the CAN bus, and a terminal resistor arranged at the end of the CAN bus, wherein each signal lamp controller is configured to control a group of traffic signal lamps.
[0029] Specifically, in the embodiment, the fifth CAN interface of the dual-core CAN gateway of each intersection leads a signal lamp branch, in each signal lamp branch, a plurality of signal lamp controllers are hung on the signal lamp branch, i.e., the CAN bus branch, through the CAN bus interface, and a terminal resistor is connected at the end of the CAN bus branch, and a group of traffic signal lamps is connected to each signal lamp controller.
[0030] Referring to Figure 3 As shown in the figure, the dual-core CAN gateway includes a first processor and a second processor in bidirectional communication connection, and both processors are electrically connected with the third CAN interface, the fourth CAN interface and the fifth CAN interface. Among them, the two processors control each other to be in the on state or the high resistance state.
[0031] The first processor includes a first main isolation transceiver electrically connected with the third CAN interface, a second main isolation transceiver electrically connected with the fourth CAN interface, and a third main isolation transceiver electrically connected with the fifth CAN interface. The second processor includes a first slave isolation transceiver electrically connected with the third CAN interface and the first main isolation transceiver, a second slave isolation transceiver electrically connected with the fourth CAN interface and the second main isolation transceiver, and a third slave isolation transceiver electrically connected with the fifth CAN interface and the third main isolation transceiver.
[0032] The first processor is configured to send a processor state signal to the second processor and control the first slave isolation transceiver, the second slave isolation transceiver and the third slave isolation transceiver of the second processor to be in the high resistance state. The second processor is configured to receive the processor state signal, and when detecting an abnormality of the processor state signal, control the first main isolation transceiver, the second main isolation transceiver and the third main isolation transceiver of the first processor to be switched from the on state to the high resistance state.
[0033] Specifically, in the embodiment, each intersection is provided with a dual-core CAN gateway, and the dual-core CAN gateway includes two first processors A and second processors B with three channels, and the processors A and B share the third CAN interface, the fourth CAN interface and the fifth CAN interface, and a terminal resistor is connected to each gateway interface.
[0034] One processor controlled 3-way isolated transceiver of the dual-core CAN gateway is controlled by another processor to be in the on state or high resistance state. Specifically, in the normal state, the processor A controls the 3-way isolated transceiver controlled by the processor B to be in the high resistance state. At this time, all information passes through the 3-way gateway interface controlled by the processor A, and the processor A sends the normal information of the processor A to the processor B every heartbeat time. If the processor B receives abnormal information of the processor A or the processor B does not receive information of the processor A for more than one heartbeat time, the processor B controls the 3-way isolated transceiver controlled by the processor A to be in the high resistance state. At this time, all information passes through the 3-way gateway interface controlled by the processor B, and a warning information is sent to the device maintenance personnel for alarm.
[0035] Meanwhile, each signal machine output signal converter, gateway and signal lamp controller is provided with an ID, which can be used for identity recognition.
[0036] Therefore, the application can avoid the faults caused by the overlong CAN bus, the damage of the CAN bus trunk line and the impedance mismatch of the CAN bus, greatly improves the reliability of the system, and can conveniently collect signals and transmit the signals, can detect the faults of the device system in real time, so that the faults can be quickly repaired.
[0037] The prior art does not adopt the above redundant design, and the reliability is not high, and the application adopts the double redundant design in the underground wiring part, i.e. the CAN bus trunk part, which greatly improves the reliability.
[0038] Meanwhile, the application can avoid the faults caused by the overlong CAN bus, the damage of the CAN bus trunk line and the impedance mismatch of the CAN bus, greatly improves the reliability of the system, and can conveniently collect signals and transmit the signals, can detect the faults of the device system in real time, so that the faults can be quickly repaired.
[0039] In summary, compared with the signal machine output matrix cable directly connected signal lamp of the prior art, the application provides a bus harness, simple wiring, simple maintenance, and the entire bus control traffic signal lamp system is controlled by the CAN bus technology, the entire system only contains a CAN bus trunk of a ring circuit and a CAN bus branch in each signal lamp branch. Meanwhile, each signal lamp branch can take the commercial alternating current 220V power supply nearby.
[0040] Meanwhile, the application can avoid the CAN bus faults, greatly improves the reliability of the system, so that the faults can be quickly repaired. And the double redundant design is adopted in the underground wiring part, i.e. the CAN bus trunk part, which greatly improves the reliability.
[0041] It should be noted that in the above-mentioned embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.
[0042] Although preferred embodiments of the application have been described herein, with reference to the accompanying drawings, to which a person skilled in the art would readily appreciate that various alterations and modifications to these embodiments could be made without departing from the spirit and scope of the application. Accordingly, it is intended that all such alterations and modifications be considered as falling within the scope of the application as defined by the appended claims.
[0043] It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application cover modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.
Claims
1. A bus-controlled traffic light system, characterized in that: include: Traffic light converter, used to send traffic light control signals; Multiple dual-core CAN gateways are electrically connected in sequence via a CAN bus, with the first dual-core CAN gateway being electrically connected to the receiving end of the signal converter via the CAN bus, and the last dual-core CAN gateway being electrically connected to the transmitting end of the signal converter via the CAN bus, to form a ring loop; A plurality of signal light branches, each of the signal light branches being electrically connected to a corresponding dual-core CAN gateway via a CAN bus; Each of the traffic light branches is used to receive a signal sent by the corresponding dual-core CAN gateway to control the traffic light.
2. The bus-controlled traffic light system according to claim 1, characterized in that: The signal converter includes a converter body, a first CAN interface and a second CAN interface provided on the converter body, wherein the first CAN interface is a transmitting end and the second CAN interface is a receiving end; The converter body is used to control the first CAN interface and the second CAN interface to send signals synchronously when it is detected that the signal received by the second CAN interface is abnormal.
3. The bus-controlled traffic light system according to claim 2, characterized in that: The converter body includes a signal machine that outputs a signal light control matrix signal, a voltage converter electrically connected to the signal machine and used to convert the signal light control matrix signal into voltage, an optoelectronic isolator electrically connected to the voltage converter, and a signal processor electrically connected to the optoelectronic isolator, the first CAN interface, and the second CAN interface.
4. The bus-controlled traffic light system according to claim 2, characterized in that: The dual-core CAN gateways each include a gateway body, a third CAN interface and a fourth CAN interface provided on the gateway body; The third CAN interface of the first dual-core CAN gateway electrically connected to the receiving end of the signal converter is electrically connected to the second CAN interface, and the fourth CAN interface of the last dual-core CAN gateway electrically connected to the transmitting end of the signal converter is electrically connected to the first CAN interface; Among the remaining dual-core CAN gateways, the fourth CAN interface of one dual-core CAN gateway is electrically connected to the third CAN interface of another dual-core CAN gateway connected in sequence.
5. The bus-controlled traffic light system according to claim 4, characterized in that: The dual-core CAN gateway further includes a fifth CAN interface, and each of the signal light branches is electrically connected to the fifth CAN interface of a corresponding one of the dual-core CAN gateways via a CAN bus.
6. The bus-controlled traffic light system according to claim 5, characterized in that: The traffic light branch includes a plurality of traffic light controllers electrically connected to the fifth CAN interface via a CAN bus, and a terminal resistor provided at the end of the CAN bus, wherein each of the traffic light controllers is used to control a corresponding group of traffic lights.
7. The bus-controlled traffic signal light system according to claim 5, characterized in that: The dual-core CAN gateway includes a first processor and a second processor connected in bidirectional communication, and both processors are electrically connected to the third CAN interface, the fourth CAN interface and the fifth CAN interface; The two processors control each other to be in a conducting state or a high-impedance state.
8. The bus-controlled traffic signal light system according to claim 7, characterized in that: The first processor includes a first master isolated transceiver electrically connected to the third CAN interface, a second master isolated transceiver electrically connected to the fourth CAN interface, and a third master isolated transceiver electrically connected to the fifth CAN interface; The second processor includes a first slave isolation transceiver electrically connected to the third CAN interface and the first master isolation transceiver, a second slave isolation transceiver electrically connected to the fourth CAN interface and the second master isolation transceiver, and a third slave isolation transceiver electrically connected to the fifth CAN interface and the third master isolation transceiver.
9. The bus-controlled traffic signal light system according to claim 8, characterized in that: The first processor is configured to send a processor status signal to the second processor, and control the first slave isolation transceiver, the second slave isolation transceiver, and the third slave isolation transceiver of the second processor to be in a high-impedance state; The second processor is used to receive the processor status signal, and when it is detected that the processor status signal is abnormal, it controls the first main isolation transceiver, the second main isolation transceiver, and the third main isolation transceiver of the first processor to be converted from the on state to the high-impedance state.
10. The bus-controlled traffic light system according to claim 8, characterized in that: The third CAN interface and the fourth CAN interface are each electrically connected to a corresponding terminal resistor.