CN102496290A - Traffic signal controlling machine based on CAN (Controller Area Network) communication - Google Patents
Traffic signal controlling machine based on CAN (Controller Area Network) communication Download PDFInfo
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- CN102496290A CN102496290A CN2011104261346A CN201110426134A CN102496290A CN 102496290 A CN102496290 A CN 102496290A CN 2011104261346 A CN2011104261346 A CN 2011104261346A CN 201110426134 A CN201110426134 A CN 201110426134A CN 102496290 A CN102496290 A CN 102496290A
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Abstract
The invention discloses a traffic signal controlling machine based on CAN (Controller Area Network) communication, which comprises a main control unit, a vehicle detection unit and a signal lamp control unit, wherein the main control unit is respectively connected and communicated with the vehicle detection unit and the signal lamp control unit through CAN buses. The traffic signal controlling machine disclosed by the invention executes data transmission in a CAN bus communication manner, has strong anti-jamming capability, can effectively reduce fault rate of a device under a hostile electromagnetic environment, ensures that a signaler reliably runs, and reduces maintenance cost while ensuring that the traffic of a junction is smooth; and simultaneously, the CAN bus communication manner utilizes a differential signal transmission manner, thus the transmission lines are few and the cost is low.
Description
Technical field
The invention belongs to the traffic control system technical field, specifically, relate to a kind of traffic signal controlling machine based on CAN bus communication mode.
Background technology
Along with fast development, the level of urbanization of China's road traffic improves constantly and the continuous expansion of city size, traffic problems are increasingly sophisticated, and the electromagnetic environment in city is also more and more abominable, and interference problem is more and more serious.Traffic signal controlling machine is the visual plant that is used for controlling traffic lights on the intersection; Controlling belisha beacon makes it to change according to certain rules; Be that the city intersection vehicle is commanded and the important component part of the control system of dredging, unimpeded, the safety of urban transportation of urban road and the management of urban transportation are all played crucial effects.
Present complicated traffic environment requires increasingly high to the communication performance of traffic signal controlling machine; The conventional bus communication mode that is adopted in the existing traffic signal controlling machine bus communication mode of CSMA/CD network (for example based on) can't guarantee teleseme reliable work under this abominable electromagnetic interference environment; Therefore; Failure rate is increasingly high, is having a strong impact on the traffic order in city.
Summary of the invention
The present invention is in order to solve existing traffic signal controlling machine poor anti jamming capability, to be applied in the high problem of failure rate under the abominable electromagnetic environment; A kind of novel traffic signal controller based on CAN bus communication mode has been proposed; Reliability is high, and real-time is good, adapts to the urban traffic environment of current complicacy.
For solving the problems of the technologies described above, the present invention adopts following technical scheme to be achieved:
A kind of traffic signal controlling machine based on CAN communication comprises main control unit, car test unit and signal lamp control module; Wherein, said main control unit is connected communication with described car test unit with the signal lamp control module respectively through the CAN bus.
In order to improve the real-time of data communication, said main control unit is connected communication through an independent CAN bus with the car test unit, is connected communication through an other independent CAN bus with the signal lamp control module.
Further, car test signal to described main control unit is regularly uploaded according to the predefined time in said car test unit; Perhaps after receiving the request instruction that main control unit issues, the car test signal that collects is uploaded to described main control unit.
Preferably, in said car test unit, be provided with controller and 16 channel signal capture cards, be used to carry out 16 tunnel input; Said controller control signal capture card carries out timesharing to 16 road signals and detects, detect one-period after, 16 road signals that collect are carried out the conversion process of data layout, and then generate the CAN bus differential signal that meets the CAN protocol specification and be uploaded to main control unit.
Preferably, said car test unit comprises two-way, all is articulated on same the CAN bus, and the car flow information of the oral sex of satisfying the need respectively fork both direction detects.
Further again; In said signal lamp control module, include controller and driving circuit; Said controller connects main control unit through the CAN bus; Receive the signal lamp sequential configuration signal that main control unit passes down, and then the control signal that generates corresponding time sequence exports each road signal lamp to through driving circuit, the work schedule of each road signal lamp is controlled.
Preferably, said signal lamp control module is provided with multichannel, the work schedule of the signal lamp of a direction of No. one signal lamp control module control, and each road signal lamp control module is articulated on same the CAN bus.
Further again; In the described signal lamp control module in each road; Its controller all produces 4 groups of phase signals, includes 3 sequential Different control signals in each group phase signal, respectively the red yellowish green trichromatism signal lamp in 4 traffic lights is carried out sequential control.
Further, in said main control unit, include a primary processor, two CAN communication controlers and two CAN communication transceivers; Said primary processor through its two-way SPI interface respectively with two corresponding connections of CAN communication controler, and connect one to one with two CAN communication transceivers respectively through two CAN communication controlers; Two CAN communication transceivers separately through a CAN bus respectively with the corresponding connection in described car test unit or signal lamp control module; Between said CAN communication controler and CAN communication transceiver, the reception signal that is transmitted between the two is carried out isolation processing with the transmission signal through the high speed photo coupling buffer circuit.
Preferably; Said traffic signal controlling machine adopts backboard formula structure; Main control unit is laid on the independent master control borad; Every bus inspection unit is laid in one separately independently on the car test plate, and every road signal lamp control module is laid in one separately independently on the phase-plate, for each provides the power module of WV to be laid on the independent power panel with electric loading in the traffic signal controlling machine; Each functional cards is inserted on the unified backboard, lays described CAN bus in the backboard, and through the be connected communication of CAN bus realization master control borad with each car test plate, each phase-plate.
Compared with prior art; Advantage of the present invention and good effect are: traffic signal controlling machine of the present invention adopts CAN bus communication mode to carry out data transmission; Antijamming capability is strong, under abominable electromagnetic environment, can effectively reduce rate of breakdown, guarantees the teleseme reliability service; When ensureing that crossing traffic is unimpeded, reduce maintenance cost.Simultaneously, because the CAN bus communication adopts the differential signal transmission mode, thereby transmission line is few, and cost is low.
After the detailed description in conjunction with the advantages embodiment of the present invention, other characteristics of the present invention and advantage will become clearer.
Description of drawings
Fig. 1 is the system communication Organization Chart of traffic signal controlling machine proposed by the invention;
Fig. 2 is the circuit theory diagrams of a kind of embodiment of main control unit among Fig. 1;
Fig. 3 is that the integrated circuit board of a kind of embodiment of traffic signal controlling machine proposed by the invention connects synoptic diagram;
Fig. 4 is the complete machine structure figure that adopts the traffic signal controlling machine that integrated circuit board connected mode shown in Figure 3 designed.
Embodiment
Describe in detail below in conjunction with the accompanying drawing specific embodiments of the invention.
Embodiment one, and in practice, the conventional bus communication mode that traffic signal controlling machine adopted generally has two kinds of important bus assignment methods: distribute on schedule and distribute on demand.In first method, the application bus no matter whether each stands, all to each station by distributing during the maximum.Thus, bus can be assigned to each station and be unique station, no matter and it is to carry out bus access immediately or carry out bus access at a special time, this will guarantee that clear and definite bus assignment is arranged when bus access.In the second approach, bus is distributed to a station by the basic demand that transmits data, and the transmission that bus system is hoped by the station distributes (as: Ethernet CSMA/CD).Therefore, when bus access is asked simultaneously in a plurality of stations, bus will stop the request at all stations, at this moment will not have any one station and obtain bus assignment.
And adopt the method for CAN Communication Realization bus assignment, can guarantee when the application bus access of different stations, to carry out bus assignment clearly.CAN signal post based on the position referee method can solve the collision problem that when data are sent simultaneously in two stations, produces.Be different from the message arbitration of Ethernet, the non-destructive of CAN solves the method for bus access conflict, guarantees that bus is not occupied when not transmitting useful message.Even work as bus under the heavy duty situation, be that preferential bus access also is proved to be a kind of efficient system with message content.Though the transmittability of bus is not enough, all unsolved transmission requests are all handled by sequence of importance.In the such network of CSMA/CD, like Ethernet, system often collapses owing to overload, and this situation can not take place in CAN communication.
The data segment, length of CAN communication protocol is at most 8 bytes, can satisfy the general requirement of control command, duty and test data in the common industrial circle.Simultaneously, it is long that 8 bytes can not take bus time, thereby guaranteed the real-time of communication.CAN communication protocol adopts CRC cyclic redundancy check method and the corresponding error processing capacity can be provided, and can guarantee reliability of data communication.
Antijamming capability is strong, real-time communication good because CAN communication has, and therefore, it is applied in the traffic signal controlling machine, can adapt to current abominable electromagnetic environment, guarantees the stability of traffic signal controlling machine work.
Based on this, present embodiment has proposed a kind of system architecture design form of the traffic signal controlling machine based on CAN bus communication mode.
The signal lamp control module that the traffic lights that in the traffic signal controlling machine of present embodiment, be provided with as the main control unit of controlling core, are used to detect the car test unit of crossing traffic state and be used to control all directions on the crossing move.Wherein, main control unit is connected with the signal lamp control module is corresponding with described car test unit respectively through the CAN bus, to carry out the data interaction communication mode based on the CAN bus.
In order to guarantee real time of data transmission, present embodiment is the preferred two-way CAN bus of laying in traffic signal controlling machine, and referring to shown in Figure 1, one road CAN bus is used to connect main control unit and car test unit, satisfies the transmission requirement of car flow information; Another road CAN bus is used to connect main control unit and signal lamp control module, accomplishes the control requirement of signal lamp work schedule.
In the present embodiment, can adopt regularly transmission perhaps by two kinds of communication patterns of request transmission between said car test unit and the main control unit.When adopting regularly transmission mode, main control unit is through passing the timing setting value to the car test unit under the CAN bus, and notice car test unit regularly is uploaded to main control unit with the car flow information that collects according to the time of setting, to be used to carry out road condition analyzing.And when adopting the request transmission mode; Main control unit can be when needs obtain car flow information, initiatively send request to the car test unit, and the car test unit is after receiving the request instruction that main control unit sends over; The car flow information that collects is uploaded to main control unit, with the request of response main control unit.
In order to adapt to the traffic of present complicacy; Satisfy the vehicle detection requirement in a plurality of tracks; Present embodiment is preferably laid two-way car test unit simultaneously in traffic signal controlling machine; Two-way car test unit is articulated on same the CAN bus, and the car flow information of the oral sex of satisfying the need respectively fork both direction detects.Main control unit can be set different timing uplink times or send the upload request instruction to two-way car test unit in turn two-way car test unit, receives car flow information with timesharing.Certainly, car flow information also can be uploaded to main control unit simultaneously in two-way car test unit, utilize CAN signal post based on the position referee method can solve the collision problem that produces when two-way car test unit sends data simultaneously well.
Configuration Control Unit and 16 channel signal capture cards on each bus inspection unit are to support the collection of 16 road detection signals.As a kind of preferred design of present embodiment, can utilize controller that 16 paths of said data acquisition card are carried out the timesharing detection, promptly 16 road detection signals are carried out acquisition time.After the process input of one-period, 16 road detection signals that controller will collect carry out the conversion process of data layout, and then generate the CAN bus differential signal that meets the CAN protocol specification, are uploaded to main control unit.
For which bus inspection unit of configuration in traffic signal controlling machine, several roads sense channel is supported in each bus inspection unit, and present embodiment is not limited in above giving an example, and the technician can be according to the actual conditions choose reasonable configuration targetedly at crossing.
For the signal lamp control module; Present embodiment can adopt the system design mode through the signal lamp of a direction of No. one signal lamp control module control, at this moment, need in traffic signal controlling machine, lay multiple signals lamp control module simultaneously; With 8 the tunnel is that example describes; Referring to shown in Figure 1, No. 8 signal lamp control modules are articulated on same the CAN bus, be connected communication with main control unit through same CAN bus.In each road signal lamp control module, be provided with controller and driving circuit; Said controller connects main control unit through the CAN bus, carries out CAN with main control unit and communicates by letter, and receives the signal lamp sequential configuration signal that main control unit passes down; And then the control signal that generates corresponding time sequence exports driving circuit to; Be enough to the driving voltage that the drive signal lamp is lighted via the driving circuit generation, export each road signal lamp to, the work schedule of each road signal lamp is controlled.
As a kind of preferred design of present embodiment, can utilize each road controller to produce 4 groups of phase signals, be respectively applied for 4 traffic lights of control; In each group phase signal, comprise 3 sequential Different control signals, respectively the red yellowish green trichromatism signal lamp in the traffic lights is carried out sequential control.Thus, for the crossing that 4 traffic lights are installed in one direction, utilize No. one signal lamp control module can realize sequential control to its red yellowish green trichromatism signal lamp.
For the teaming method of main control unit, present embodiment adopts a primary processor to cooperate two CAN communication controlers and two CAN communication transceivers to make up, referring to shown in Figure 2.Wherein, Two CAN communication transceivers (among Fig. 2 D16 be wherein one road CAN communication transceiver) connect one to one with two CAN buses respectively; Receive the CAN bus differential signal that car test unit and signal lamp control module are uploaded; Convert the single-ended signal of Transistor-Transistor Logic level form to, transfer to CAN communication controler (among Fig. 2 D15 be wherein one road CAN communication controler) via the reception signal terminal RXD of CAN communication transceiver D16, and then convert SPI universal serial bus data to; (CAN_SCK, CAN_SO, CAN_SI, CAN_CS) transfers to primary processor via spi bus, accomplishes uploading of data.The command signal that primary processor need reach car test unit and signal lamp control module down transfers to CAN communication controler D15 via the SPI interface of primary processor; CAN communication controler D15 handles according to the CAN protocol specification the data that pass down; And then the transmission signal terminal TXD that sends a signal to CAN communication transceiver D16 of output Transistor-Transistor Logic level form; Convert CAN bus differential signal transmission to described car test unit and signal lamp control module to via CAN communication transceiver D16, accomplish the following biography of data.
For the security of raising system operation, present embodiment connects ESD device V3, V4 respectively on the one hand on CAN bus differential signal circuit, as shown in Figure 2, with surge voltages such as inhibition static, protection electron device; Series connection common mode inductance L6 in CAN bus differential signal circuit with the common mode interference in the filtering appts, guarantees the accuracy of signal transmission on the other hand; In addition, between said CAN communication controler D15 and CAN communication transceiver D16, adopt high speed photo coupling buffer circuit ISO4, ISO3 respectively to being transmitted in the reception signal between the two and sending signal and carry out the photoelectricity isolation processing, to realize the isolation of strong and weak electricity.
As the overall construction design of said traffic signal controlling machine, present embodiment preferably adopts backboard formula structure, referring to shown in Figure 3.Main control unit is laid on the master control borad; Every bus inspection unit is laid in one separately independently on the car test plate; Every road signal lamp control module is laid in one separately independently on the phase-plate, for each provides the power module of WV then can be laid on the independent power panel with electric loading in the traffic signal controlling machine.Each functional cards is inserted on the unified backboard, lays described CAN bus in the backboard, the CAN bus communication link of each functional cards connects through backboard and realizes communicating by letter.
Fig. 4 is the machine shape structural drawing of the traffic signal controlling machine that adopts backboard formula structural design, is master control borad 1, two car test plate 2-3, eight phase-plate 4-11, hollow plate 12 and power panels 13 from left to right successively.Wherein, hollow plate 12 can be selected other suitable functional cards replacements according to traffic signal controlling machine actual operating position in the future, and it is inserted on the backboard, with the function of spread signal machine.
Said for ease traffic signal controlling machine is connected communication with external unit; On said master control borad 1, various types of communication interfaces can also be set further; For example USB interface, serial ports and network interface etc.; As shown in Figure 4, each communication interface via the distinct interface circuit that is provided with on the master control borad realize with main control unit in primary processor be connected communication.
Certainly; The above only is a kind of preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (10)
1. the traffic signal controlling machine based on CAN communication comprises main control unit, car test unit and signal lamp control module; It is characterized in that: said main control unit is connected communication with described car test unit with the signal lamp control module respectively through the CAN bus.
2. the traffic signal controlling machine based on CAN communication according to claim 1; It is characterized in that: said main control unit is connected communication through an independent CAN bus with the car test unit, is connected communication through an other independent CAN bus with the signal lamp control module.
3. the traffic signal controlling machine based on CAN communication according to claim 2 is characterized in that: car test signal to described main control unit is regularly uploaded according to the predefined time in said car test unit; Perhaps after receiving the request instruction that main control unit issues, the car test signal that collects is uploaded to described main control unit.
4. the traffic signal controlling machine based on CAN communication according to claim 3; It is characterized in that: in said car test unit, be provided with controller and 16 channel signal capture cards; Be used to carry out 16 tunnel input, said controller control signal capture card carries out timesharing to 16 road signals and detects, behind the detection one-period; 16 road signals that collect are carried out the conversion process of data layout, and then generate the CAN bus differential signal that meets the CAN protocol specification and be uploaded to main control unit.
5. the traffic signal controlling machine based on CAN communication according to claim 4, it is characterized in that: said car test unit comprises two-way, all is articulated on same the CAN bus, the car flow information of the oral sex of satisfying the need respectively fork both direction detects.
6. the traffic signal controlling machine based on CAN communication according to claim 2; It is characterized in that: in said signal lamp control module, include controller and driving circuit; Said controller connects main control unit through the CAN bus; Receive the signal lamp sequential configuration signal that main control unit passes down, and then the control signal that generates corresponding time sequence exports each road signal lamp to through driving circuit, the work schedule of each road signal lamp is controlled.
7. the traffic signal controlling machine based on CAN communication according to claim 6; It is characterized in that: said signal lamp control module is provided with multichannel; The work schedule of the signal lamp of a direction of No. one signal lamp control module control, each road signal lamp control module is articulated on same the CAN bus.
8. the traffic signal controlling machine based on CAN communication according to claim 7; It is characterized in that: in the described signal lamp control module in each road; Its controller all produces 4 groups of phase signals; Include 3 sequential Different control signals in each group phase signal, respectively the red yellowish green trichromatism signal lamp in 4 traffic lights is carried out sequential control.
9. according to each described traffic signal controlling machine in the claim 2 to 8, it is characterized in that: in said main control unit, include a primary processor, two CAN communication controlers and two CAN communication transceivers based on CAN communication; Said primary processor through its two-way SPI interface respectively with two corresponding connections of CAN communication controler, and connect one to one with two CAN communication transceivers respectively through two CAN communication controlers; Two CAN communication transceivers separately through a CAN bus respectively with the corresponding connection in described car test unit or signal lamp control module; Between said CAN communication controler and CAN communication transceiver, the reception signal that is transmitted between the two is carried out isolation processing with the transmission signal through the high speed photo coupling buffer circuit.
10. according to each described traffic signal controlling machine in the claim 1 to 8 based on CAN communication; It is characterized in that: said traffic signal controlling machine adopts backboard formula structure; Main control unit is laid on the independent master control borad; Every bus inspection unit is laid in one separately independently on the car test plate, and every road signal lamp control module is laid in one separately independently on the phase-plate, for each provides the power module of WV to be laid on the independent power panel with electric loading in the traffic signal controlling machine; Each functional cards is inserted on the unified backboard, lays described CAN bus in the backboard, and through the be connected communication of CAN bus realization master control borad with each car test plate, each phase-plate.
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| CN103345845A (en) * | 2013-06-15 | 2013-10-09 | 汕头市鼎安电子科技有限公司 | Traffic signal control system with self-healing function |
| CN103400503A (en) * | 2013-08-26 | 2013-11-20 | 西华大学 | Multiphase traffic signal control machine based on IIC (Intel Integrate Circuit) bus |
| CN103473938A (en) * | 2013-09-16 | 2013-12-25 | 广东京安交通科技有限公司 | Extendable modular road traffic signal control machine and extension method thereof |
| CN104408945A (en) * | 2014-11-14 | 2015-03-11 | 南京蓝泰交通设施有限责任公司 | Carrier wave communication-based bus type road signal system and working method thereof |
| CN105575137A (en) * | 2015-12-31 | 2016-05-11 | 长安大学 | Signaling control system based on CAN bus |
| CN106658916A (en) * | 2016-12-29 | 2017-05-10 | 武汉恒达智慧城市交通研发有限公司 | Traffic signal lamp system controlled by bus transmission mode |
| CN106945687A (en) * | 2016-12-27 | 2017-07-14 | 怀宁鑫橙信息技术有限公司 | A kind of method for designing of railway signal system |
| CN106991825A (en) * | 2017-05-05 | 2017-07-28 | 深圳市哈工大交通电子技术有限公司 | The lamp system controlled based on CAN |
| CN109921971A (en) * | 2019-03-25 | 2019-06-21 | 江苏凯龙宝顿动力科技有限公司 | A kind of two-way CAN communication device |
| CN113112822A (en) * | 2021-03-30 | 2021-07-13 | 湖南建工德顺电子科技有限公司 | Centralized coordination type road traffic signal control machine |
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| CN103345845A (en) * | 2013-06-15 | 2013-10-09 | 汕头市鼎安电子科技有限公司 | Traffic signal control system with self-healing function |
| CN103345845B (en) * | 2013-06-15 | 2016-01-27 | 汕头市鼎安电子科技有限公司 | A kind of traffic signal control system with self-healing function |
| CN103400503A (en) * | 2013-08-26 | 2013-11-20 | 西华大学 | Multiphase traffic signal control machine based on IIC (Intel Integrate Circuit) bus |
| CN103473938A (en) * | 2013-09-16 | 2013-12-25 | 广东京安交通科技有限公司 | Extendable modular road traffic signal control machine and extension method thereof |
| CN104408945A (en) * | 2014-11-14 | 2015-03-11 | 南京蓝泰交通设施有限责任公司 | Carrier wave communication-based bus type road signal system and working method thereof |
| CN105575137A (en) * | 2015-12-31 | 2016-05-11 | 长安大学 | Signaling control system based on CAN bus |
| CN106945687A (en) * | 2016-12-27 | 2017-07-14 | 怀宁鑫橙信息技术有限公司 | A kind of method for designing of railway signal system |
| CN106658916A (en) * | 2016-12-29 | 2017-05-10 | 武汉恒达智慧城市交通研发有限公司 | Traffic signal lamp system controlled by bus transmission mode |
| CN106991825A (en) * | 2017-05-05 | 2017-07-28 | 深圳市哈工大交通电子技术有限公司 | The lamp system controlled based on CAN |
| CN109921971A (en) * | 2019-03-25 | 2019-06-21 | 江苏凯龙宝顿动力科技有限公司 | A kind of two-way CAN communication device |
| CN113112822A (en) * | 2021-03-30 | 2021-07-13 | 湖南建工德顺电子科技有限公司 | Centralized coordination type road traffic signal control machine |
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Application publication date: 20120613 |