CN102779416A - Bus priority controller - Google Patents
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- CN102779416A CN102779416A CN201210289672XA CN201210289672A CN102779416A CN 102779416 A CN102779416 A CN 102779416A CN 201210289672X A CN201210289672X A CN 201210289672XA CN 201210289672 A CN201210289672 A CN 201210289672A CN 102779416 A CN102779416 A CN 102779416A
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Abstract
The invention discloses a bus priority controller capable of being applied on an urban traffic signal control system for entitling time priority to buses, the controller utilizes a modularization design, a reader-writer device of the traffic signal control system performs non-contact radio frequency communication and information collection on the buses in various directions of an intersection, the bus priority controller performs bus priority algorithm operation and passage condition judgment on the obtained bus label information data to determine whether entitling bus priority passage authority and send phase control commands to an intersection signal controller to control the phase of a signal lamp so as to reduce the waiting time of the buses at the intersection to the utmost in an optimal mode to enable the buses to pass by the intersection quickly, and the bus priority passage is realized. The bus priority controller disclosed by the invention is applied in the urban road traffic signal control system in low construction cost and quick effectiveness, the technical scheme is easy to realize, the operation process is intelligent, and the characteristics of the current urban traffic signal control system are unnecessary to be greatly reformed, so that the bus priority controller has brilliant application prospect and generalization value.
Description
Technical field
The present invention relates to be used to control in the urban road transportation control system controller of roadway sign, particularly a kind of public traffic in priority controller that is used for city intersection.
Background technology
Along with increasing sharply of Chinese cities and towns vehicle guaranteeding organic quantity; The traffic congestion situation of Chinese city road also is on the rise, and this situation brings inconvenience and difficulty not only for a lot of city dwellers' trip, also development of city is brought 'bottleneck' restrictions; At present become many cities major issue to be solved has been arranged; For avoiding or solve the problem that the urban road congestion situation is brought, a lot of local suggestions that propose " public traffic in priority " are promptly in urban development and planning; The public transport construction with improve passenger traffic efficient and consider on giving priority to, let public transport can be solely smooth in the urban road that blocks up it is capable.Densely populated from China on the other hand, land used is in short supply and the national conditions of ecological environmental protection, first develops efficiently that public transport also is the main developing direction of China's urban transportation, is the basic strategy that solves urban transport problems.
" public traffic in priority " comprises two aspects, promptly to public transport in current " space " with give preferential on " time ".So-called " space is preferential " is through setting up dedicated bus lanes and circuit to realize; So-called " time priority " then is embodied in the control signal that priority pass is provided for bus.
Present city fast public traffic system (BRT) is to improve the urban public transport level, solves a kind of new public transport mode of urban road congestion; It utilizes modernized public transport technology to cooperate intelligent transportation and operation management, opens up the public transportation lane road and builds new bus stop, with the operation method of service of track traffic; Reach a kind of urban transit system of light rail excellent service standard; This public transport belongs to " space is preferential " pattern, but this pattern need be opened up dedicated bus lanes and circuit, and its investment and operation cost are higher; Be not easy in small and medium-sized cities to realize, and on the ordinary road of city, also be inappropriate for and open up this public traffic in priority designated lane; In addition; Some metropolitan part turnpike roads have been opened up dedicated bus lanes in China; It is alleviating traffic congestion, improve public transport operation efficient aspect and obtain certain effect really, but effect still is not very good for the public transit system of entire city; Trace it to its cause except lacking system's effective public designated lane planning and investment very greatly; Topmost problem is still can't priority pass at numerous normal crossing crossing public transit vehicles, and public transit vehicle is in delay time at stop much larger than the highway section sometimes stand-by period of intersection, and in the bus whole service time, has accounted for larger specific gravity; Therefore can not realize public traffic in priority at city intersection, just be difficult to realize the public traffic in priority of real meaning.
In addition; Also once attempted to utilize GPS track and localization technology to solve the public traffic in priority technical matters of city bus in indivedual cities; This mode cooperates the GPS technology with the signal controlling machine of intersection, when bus arrives the intersection, handle through the information interchange between bus, gps satellite, traffic light signal controller; The transformation of control traffic lights realizes public traffic in priority with part, this " time priority " pattern that is a kind of.
Though the gps satellite location technology can be used for the track and localization vehicle, exist GPS mobile unit price more expensive, problems such as jitter; And traffic system is as too relying on the GPS technology, in case the GPS paralysis, then system is difficult to return to traditional way to manage; This will cause big loss and negative effect to national economy, and the main problem of GPS be the satellite signal source of present domestic commercial gps system is state's outer control, and the autonomous high performance gps system of China is realized needing time; GPS must combine the GIS GIS-Geographic Information System on using; In exploitation, not only increased the cost of using,, also can influence the accuracy of system greatly if upgrade untimelyly; GPS technology and be not suitable for the application of triggering automatically when vehicle arrives the intersection in addition; This technological deficiency has limited the application of GPS on the urban road public traffic in priority, and this technological system complex structure, only is in the exploratory stage at present.
By on can know that as far as a lot of cities, solve the technical matters of city " public traffic in priority " with " space is preferential ", difficulty is very big, and is not easy to realize; And GPS vehicle tracking location technology receives technological limitations restrict own; Can not technical basic solution carry out the systemic technical matters of public traffic in priority at urban road; And this technical scheme does not form applicable mature technology; Therefore how on numerous bus routes crossing, city, adopting with " time priority " pattern is master's public traffic in priority technical scheme, is a lot of cities technical issues that need to address.
Summary of the invention
The present invention is a kind of public traffic in priority controller that proposes for solving the problems of the technologies described above; Sort controller can be on the working foundation of existing Controlling Traffic Signals in Urban Roads system; Mate with signal controlling machine; Realize bus priority pass crossing in urban road, the minimizing bus improves the travelling speed and the efficient of bus through the working time of urban road crossing.
For realizing above-mentioned purpose, public traffic in priority controller provided by the invention adopts the modular design manufacturing, and it comprises signal processing module, triggering and micro-control output module, interface module, display module, power module and phase place indicating module, wherein
Signal processing module is used to accomplish crossing bus data message, decides the reception storage of timing scheme and data are carried out public traffic in priority algorithm calculation process and comparison, sent function such as signal lamp phase control instruction;
Trigger and the micro-control output module; Be used for result according to signal processing module; The make-and-break time of pilot relay with drive the relay mouthful signal controller that satisfies the need and send steering order, control belisha beacon phase place working time, the phase place of accomplishing signal lamp is switched;
Interface module is used to accomplish with the data communication of outside rfid interrogator with outer PC and carries out exchanges data, is received the also vehicle electronics label information of demodulating and decoding to the signal processing module transmission by read write line simultaneously;
Display module is used for showing in real time the current operation phase place of external signal controller, phase place working time, excess time, preferential time of phase place and the information such as bus quantity that wait in each phase place;
Power module is used for power supply with outside DC12V and converts DC5V, DC3.3V power supply each module for power supply to controller into;
The phase place indicating module is used for current external signal lamp phase place running status indication;
Signal processing module is connected with micro-control output module, phase place indicating module, interface module, display module with triggering respectively, triggers to be connected with signal controlling machine with the micro-control output module, and interface module is connected with outside ultrahigh frequency radio frequency identification (RFID) reader.
Using traffic signal control system of the present invention is to utilize the RFID radiofrequency signal; Between public transit vehicle and traffic light control system, carry out contactless bidirectional information communication; Through information Recognition and processing, make traffic signal controlling machine send public transport priority signal lamp phase place, in this process
Read signal by the ultrahigh frequency radio frequency identification (RFID) reader in the traffic signal control system through the bus vehicle electronics label emission of dual-mode antenna in remote moving, bus is discerned and untouchable information acquisition automatically;
The dual-mode antenna of read write line receives the carrier signal of sending from the vehicle electronics label; Send back read write line through the antenna adjustments device; Carry out demodulating and decoding to the received signal by read write line, decoded label information is sent to public traffic in priority controller of the present invention and carries out information processing;
Handle the public transit vehicle label information of crossing all directions in real time by the signal processing module in the public traffic in priority controller, carry out computing of public traffic in priority algorithm and current condition judgment simultaneously, provide the information that whether gives the current power of public traffic in priority;
The public traffic in priority controller is compared according to the timing scheme of deciding of operation result and storage in advance simultaneously; Draw the public transport priority signal phase data; And mouthful signal controller that satisfies the need sends the phase control instruction; By signal controlling machine control signal lamp phase place and adjustment phase place working time, thereby realize the purpose of public traffic in priority at urban road intersection with " time priority " mode.
Decide in the timing scheme in each that carry out signal controlling machine; As carry out the public traffic in priority pattern, and then signal controlling machine is arranged under the full inductive mode, and the steering order of public traffic in priority controller inputs to signal controlling machine through dry contact; And realize synchronous with signal controlling machine; Signal controlling machine is just synchronous with the public traffic in priority controller after phase sequence of operation, and this moment, signal controlling machine was worked according to the timing pattern of deciding of public traffic in priority controller fully, and signal controlling machine only carries out the driving of signal lamp; The public traffic in priority controller replaces the timing function of signal controlling machine basically, and all through controller control enforcement with adjustment the working time of each phase place of signal lamp; When the crossing is in conventional state, in the time of need not carrying out the public traffic in priority pattern, signal controlling machine then moves basically decides the timing pattern, and the public traffic in priority controller is not participated in its course of work, and the phase sequence recurrent state does not change.
Public traffic in priority controller provided by the present invention; The whistle control system that can effectively solve existing urban road intersection is difficult to carry out the technical matters of public traffic in priority pattern; Realize urban public transport preferential on " time ",, can realize whole fusion with existing intersection signal control system equipment and upper end Control Software because the present invention adopts the modular design manufacturing; Therefore it is low to have construction cost in the use of Controlling Traffic Signals in Urban Roads system; Instant effect, technical scheme realize that easily operational process is intelligent; Do not need to transform energetically the characteristics of existing traffic signal control system, therefore in City road traffic system, have broad application prospects and promotional value.
Description of drawings
Fig. 1 is the connection synoptic diagram of public traffic in priority controller of the present invention in traffic signal control system.
Fig. 2 is public traffic in priority controller one an embodiment structural representation of the present invention.
Fig. 3 is the structural representation of interface module lightning protection circuit among Fig. 2.
Fig. 4 is the workflow synoptic diagram of public traffic in priority controller of the present invention in the public transport priority signal control system.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed description
At public traffic in priority controller of the present invention shown in Figure 1 in the synoptic diagram that traffic signal control system is used.Public traffic in priority controller 101 usefulness data transmission interfaces are connected with crossing signal controlling machine 104 with the ultrahigh frequency radio frequency identification (RFID) reader 102 of system respectively; Read write line 102 is connected with the antenna 103 of traffic signal control system again; Vehicle electronics label 105 is installed on the bus, and 104 of signal controlling machines are the phase place working times of control traffic lights directly.
In the work; Radiofrequency signal by the ultrahigh frequency radio frequency identification (RFID) reader that is installed in the crossing all directions 102 sends certain frequency through antenna 103 sends this bus id information when public transport vehicle-mounted electronic tag 105 gets into antenna 103 perform regions through vehicle electronics label 105 built-in aerials; Antenna 103 receives the carrier signal of sending from vehicle electronics label 105; Antenna adjustments device through it is sent to read write line 102; Read write line 102 carries out the demodulation sign indicating number to the received signal; Be sent to the information processing that public traffic in priority controller 101 is correlated with then, public traffic in priority controller 101 is made the processing and the control of public traffic in priority according to the vehicle phase information of this label of public traffic in priority algorithm logic computing judgement in the different situations at crossing to bus; And send 104 actions of command signal control crossing signal controlling machine, make it to adjust each phase place traffic lights working time.
Structural representation with reference to public traffic in priority controller one embodiment of the present invention shown in Figure 2; Controller is made by modular design, and it is made up of signal processing module 201, triggering and micro-control output module 202, interface module 203, display module 204, power module 205 and phase place indicating module 206.
ARM7 processor 2011 is little process chip of RISC framework, and chip operation is at 32 bit patterns, and the memory interface of 128 bit widths, its exclusive accelerating structure make 32 codes can stable operation under maximum clock speed,
In the present invention, ARM7 processor 2011 is used for the collection of vehicle electronics label information, storage cart live subtab information, crossing phase information in advance, and crossing bus number is discerned statistics and public traffic in priority bit arithmetic etc. mutually.
Each crossing phase information, public transport vehicle-mounted electronic labeling information are in advance through being provided with in the FLASH database that software writes ARM7 processor 2011; Phase information and label information, read write line address information are carried out and are bound; Data write through the RS232 interface in the interface module 203 and communicate by letter with PC; A serial ports of RS232 interface and the shared ARM7 processor 2011 of RS485 interface is selected through SS.
ARM7 processor 2011 sends addressing information through the RS485 interface circulation of interface module 203 to each read write line of crossing; Receive the response message that each read write line of crossing transmits and the vehicle electronics label information of decoding simultaneously, adopt the master-slave communication pattern when each read write line of it and crossing is communicated by letter.
ARM7 processor 2011 receives by comparing one by one with the label information that is stored among the FLASH behind the vehicle electronics label information of each read write line decoding of crossing; Provide the public traffic in priority phase information at last; If there is not this card in dead card or the database; Then do not provide preferential phase information, the public traffic in priority phase information that provides transfers to C51 processor 2012 through another serial ports.
In signal processing module, the serial interface communication mode of interrupt mode is adopted in the data communication of RAM7 processor 2011 and C51 processor 2012, in order to the real-time of guarantee information transmission.
C51 processor 2012 adopts the P89V51RD2 chip, and chip is based on the 80C51 kernel, and this processor is used to handle the public traffic in priority phase information that the ARM7 processor sends, and carries out message exchange with correlation module;
C51 processor 2012 is according to the public traffic in priority phase information that is received, and the timing scheme of deciding of storing among current phase state in crossing and the C51 processor FLASH is carried out the computing of public traffic in priority algorithm; And
According to public traffic in priority algorithm operation result; Send the phase place trigger pip; Control triggers and the make-and-break time of each phase relay of micro-control output module, and then adjusts each phase place traffic lights working time, and traffic lights working times is calculated by the timer of C51 processor.
When carrying out the computing of public traffic in priority algorithm, C51 processor 2012 needs the various data messages of deciding timing in relevant crossing; It comprises that phase configuration quantity, transit time are provided with; The green time setting of each phase place (comprising normal transit time, minimum transit time, maximum transit time, public traffic in priority expansion time) etc.; These information all write among the FLASH of C51 processor in advance, and the software that is provided with that data write by PC carries out.
Various data of deciding the timing scheme write the RS232 interface that uses in the interface module 203 and communicate by letter with PC; The RS232 interface is connected to the serial ports of ARM7 processor 2011 through level conversion; The data that write are cached in earlier in the ARM7 processor 2011, are forwarded to C51 processor 2012 through program command again.
Triggering and micro-control output module 202 mainly are made up of relay and phase place switch driving circuit.
Triggering and micro-control output module 202 are used to carry out the result and the steering order of signal processing module 201; The make-and-break time of pilot relay; Drive the relay mouthful signal controller that satisfies the need and send steering order, control belisha beacon phase place working time with this, the phase place of accomplishing signal lamp is switched.
Wherein the phase place switch driving circuit uses the PNP triode to be connected with the I/O mouth of C51 processor 2012, adopts and irritates current-mode, to solve the less situation of C51 processor I/O mouth drive current; Relay adopts drive current little, has the solid-state relay of the contactless electronic beam switch of isolation features, in order to realize the isolation of public traffic in priority controller control end and signal controlling machine load end.
The triggering of public traffic in priority controller of the present invention and micro-control output module 202 have the output mode of triggering and two kinds of public traffic in priority output schemes of micro-control output mode, correspond respectively to the priority scheme of binding signal controller and can select autonomous priority scheme.
When selecting autonomous priority scheme; Triggering and micro-control output module are chosen as the micro-control output mode; This moment, the public traffic in priority controller replaced the timing function of signal controlling machine basically; Adjustment working time of each phase place is carried out the computing of public traffic in priority algorithm through signal processing module and is realized that signal controlling machine only carries out the driving of signal lamp.Carry out public traffic in priority, just adjust phase place working time, do not need preferentially under the conventional state, then move basic timing pattern, and therefore the phase sequence recurrent state does not change according to arithmetic result.
When selecting the priority scheme of binding signal controller; The defeated module of triggering and micro-control then adopts the triggering output mode; The public traffic in priority controller is only according to detected bus number; Count each phase place and arrive the bus quantity at crossing, and only export the public transit vehicle information of each phase place of crossing, the public traffic in priority phase place is carried out calculation optimization and adjustment phase place working time by signal controlling machine.
The RS485 interface chip is used for carrying out data communication with outside ultrahigh frequency radio frequency identification (RFID) reader; Employing has the difference transceiver SN75LBC184 of transient voltage inhibit feature; Built-in chip type has high-energy transition noise protective device; Can be in order to improve the reliability of the transition noise on the anti-data cable, this interface chip provides reliable and low-cost direct-connected data line interface for being connected with read write line.
The RS232 interface chip uses SP3232EB series RS-232 transceiving device; Be used for carrying out exchanges data with outer PC; This chip charge pump power supply only needs 0.1 μ F capacitor under 3.3V voltage, to operate, function that the driver that this charge pump has a device under the low-power consumption shutdown mode is exported and charge pump is under an embargo.
The RS232 interface also is used for the public transport priority signal controller is carried out the parameter setting in advance; Parameter is provided with and mainly comprises crossing phase configuration information and vehicle electronics tag configurations information; Wherein phase configuration information in crossing also comprises: the setting of phase configuration quantity, transit time; The green time setting of each phase place (comprising normal transit time, minimum transit time, maximum transit time, public traffic in priority expansion time); Card reader phase configuration etc., vehicle electronics tag configurations information comprise the corresponding phase place of label ID number, label, public bus network, public transport car plate etc., but label individual or the database of write signal processing module in batches.
The employing RS485 interface owing to communicate by letter between public traffic in priority controller and the ultrahigh frequency radio frequency identification (RFID) reader; And the network topology of RS-485 interface adopts the bus type structure of terminal coupling; This structure is connected in series each node with a bus; Be in outdoor ultrahigh frequency radio frequency identification (RFID) reader and disturb a plurality of RS-485 transceiving devices that often can cause on the transmission line to damage by the transition of thunder and lightning initiation, so the lightning Protection Design of interface module is particularly important at thunderstorm season.For this reason
The present invention is provided with lightning protection circuit 2031 at the RS-485 of interface module 203 interface; This circuit adopts primary and secondary two-stage lightning protection circuit structure; And have by PTC and insure the current-limiting protection circuit that constitutes, can realize anti-thunderbolt of the integral body of RS-485 interface and overvoltage protection from recovery.
In interface module lightning protection circuit structural drawing shown in Figure 3; Elementary lightning protection circuit 301 is made up of 3011,3012,3013,3,014 four TED-485 anti-thunder tubes; Anti-thunderbolt overvoltage protection between the line line and between line ground is provided respectively; It is fast that the TED-485 anti-thunder tube has reaction velocity, stray capacitance little (less than 1pF), the characteristic of anti-surge capacity strong (greater than 300A10/700us).The rapid reaction characteristic of TED-485 anti-thunder tube is released Lightning Over-voltage rapidly; And the big characteristic of surge absorption energy can guarantee that anti-thunder tube self is not damaged in the process of releasing; The big electric current of the transient state that produces in the process of releasing can induce a peak voltage in circuit, lie prostrate between hundreds of volts tens of, and pulsewidth arrives between hundreds of nanoseconds tens of nanoseconds; Because pulse width, the energy of this peak voltage is also little;
Secondary lightning protection circuit 303 is made up of two transient state TVS pipes 3031,3032; It can bear the voltage breakdown of 10/1000 μ s wave impulse power 600W; The effect of this circuit is to absorb the peak voltage that induces in the foregoing circuit; Voltage is clamped in the safe range reliably, circuit component is carried out quick overvoltage protection.In elementary lightning protection circuit 301 and secondary lightning protection circuit 303, be provided with lightning protection current-limiting protection circuit 302, in order to realize isolation to circuit.
This circuit is used 10/700us; The 4KV voltage simulation test that is struck by lightning; The thunderbolt simulating signal is 8V through voltage increment after the holding circuit, and this voltage limit is in-7V the safe range to+12V, and this circuit of experiment proof has formed the integral protection to the RS485 interface in the process of anti-thunderbolt.
The Chinese fonts lcd module of display module 204 use band touch functions, this module possess operating functions such as the whole screen in upper and lower, left and right moves demonstration and whole screen is removed, cursor shows, anti-white.
Display module is used for showing in real time current demand signal controller operation phase place, phase place working time, excess time, preferential time of phase place and the information such as bus quantity that wait in each phase place.
Phase place indicating module 206 is used for the indication of current demand signal controller phase place running status; It is made up of light emitting diode and phase place indication driving circuit; Wherein be used for the micro-control output mode indication of 4 road phase states is arranged; What be used to trigger output mode has an indication of 4 road phase states, and phase place indicating module 206 is connected with C51 processor 2012 usefulness I/O interfaces, indicates C51 processor 2012 to carry out the public traffic in priority phase signal that the computing of public traffic in priority algorithm draws by light emitting diode.
According to public traffic in priority controller one embodiment structural drawing of the present invention shown in Figure 2; The phase state indication of phase place indicating module 206 is consistent with the signal lamp phase state that triggering and micro-control output module 202 output to signal controlling machine 104, and promptly when triggering and micro-control when being output as phase place 1, phase place indicating module the 1 road diode is lighted; When triggering and micro-control output phase when switching to phase place 2; Then phase place indicating module the 1 road diode extinguishes, and the 2 road diode is lighted, and circular flow according to this.
The workflow that is public traffic in priority controller of the present invention in the public transport priority signal control system shown in Figure 4, when public transit vehicle arrived crossing S401, the public traffic in priority controller judged whether this phase place is green time section S402; If be green time, then calculate vehicle and can pass through crossing S403, if can pass through the crossing according to priority algorithm; Then be left intact S404 and end operation S4011 of public traffic in priority controller if can not pass through the crossing, then calculates administered over prolonged green time S405 according to priority algorithm; And control signal lamp phase place; Bus can be passed through smoothly, if will extend to largest extension time S4010 through judging, then green light is carried out maximum transit time S4012; Otherwise green light is to be in the time that bus can pass through smoothly, and the public traffic in priority controller is not done priority service and finished S4011;
If the crossing is red light stand-by period section S406, the public traffic in priority controller will be inquired about S407 excess time of green light place phase place, and the time of comparison timing scheme abundant S408 whether; If the time is longer; The timing scheme of deciding greater than the controller storage is provided with the time, and then controller provides the minimizing time of this phase place according to priority algorithm, and sends the phase control instruction and reduce green time S4013; Judge simultaneously whether next phase place is this phase place S4014; If this phase place, then bus can pass through smoothly, and controlling of controller finishes S4011; Otherwise controller reduces this phase place green light execution time S4015 by the timing scheme, and carries out minimum transit time, till this phase place; If the excess time of green light place phase place is not long, less than Preset Time, then this phase place green time of controller inoperation S409 directly judges next phase place, till this phase place finishes S4011.
Claims (7)
1. a public traffic in priority controller adopts the modular design manufacturing, it is characterized in that comprising:
Signal processing module is used to accomplish crossing bus data message, decides the reception storage of timing scheme etc., and data are carried out public traffic in priority algorithm calculation process and comparison, sends signal lamp phase control command function;
Trigger and the micro-control output module; Be used for result according to signal processing module; The make-and-break time of pilot relay with drive the relay mouthful signal controller that satisfies the need and send steering order, control belisha beacon phase place working time, the phase place of accomplishing signal lamp is switched;
Interface module is used to accomplish with the data communication of outside rfid interrogator with outer PC and carries out exchanges data, is received the also vehicle electronics label information of demodulating and decoding to the signal processing module transmission by read write line simultaneously;
Display module is used for showing in real time the current operation phase place of external signal controller, phase place working time, excess time, preferential time of phase place and the bus quantity information that waits in each phase place;
Power module is used for power supply with outside DC12V and converts DC5V, DC3.3V power supply each module for power supply to controller into;
The phase place indicating module is used for current external signal lamp controller phase place running status indication;
Signal processing module is connected with micro-control output module, phase place indicating module, interface module, display module with triggering respectively, triggers to be connected with signal controlling machine with the micro-control output module, and interface module is connected with outside ultrahigh frequency radio frequency identification (RFID) reader.
2. public traffic in priority controller according to claim 1 is characterized in that: said signal processing module is made up of ARM7 processor and C51 processor, wherein
The ARM7 processor is used for gathering in advance storage public transport vehicle-mounted electronic labeling information, crossing phase information, and crossing bus number is discerned statistics and public traffic in priority bit arithmetic mutually, and
Send addressing information through the circulation of said interface module to each read write line of crossing, receive the response message that each read write line of crossing transmits and the vehicle electronics label information of decoding simultaneously, it is characterized in that:
The ARM7 processor receives by comparing one by one with the label information that is stored among the FLASH behind the vehicle electronics label information of each read write line decoding of crossing; Provide the public traffic in priority phase information; If there is not this card in dead card or the database; Then do not provide preferential phase information, the public traffic in priority phase information that provides transfers to said C51 processor through another serial ports.
3. public traffic in priority controller according to claim 2 is characterized in that: said C51 processor adopting P89V51RD2 chip is used to handle the public traffic in priority phase information that the ARM7 processor transmits, and carries out message exchange with correlation module;
The C51 processor is according to the public traffic in priority phase information that is received, and the timing scheme of deciding of storing among current phase state in crossing and the C51 processor FLASH is carried out the computing of public traffic in priority algorithm; And
According to public traffic in priority algorithm operation result; Send the phase place trigger pip; Control the make-and-break time of said triggering and each phase relay of micro-control output module, and then adjust each phase place traffic lights working time, and traffic lights working times is calculated by the timer of C51 processor.
4. public traffic in priority controller according to claim 1; It is characterized in that: said triggering and micro-control output module are made up of relay and phase place switch driving circuit; Be used to carry out the result and the steering order of signal processing module, the make-and-break time of pilot relay drives the relay mouthful signal controller that satisfies the need and sends steering order; Control belisha beacon phase place working time with this, the phase place of accomplishing signal lamp is switched; Wherein
The phase place switch driving circuit uses the PNP triode to be connected with C51 processor I/O mouth, adopts and irritates current-mode; Relay uses drive current little, has the solid-state relay of the contactless electronic beam switch of isolation features, in order to realize the isolation of public traffic in priority controller control end and signal controlling machine load end.
5. according to claim 1 or 4 described public traffic in priority controllers; It is characterized in that: triggering and micro-control output module have the output mode of triggering and two kinds of public traffic in priority output schemes of micro-control output mode; Correspond respectively to the priority scheme of binding signal controller and can select autonomous priority scheme, wherein
When selecting autonomous priority scheme; Triggering and micro-control output module are chosen as the micro-control output mode; This moment, the public traffic in priority controller replaced the timing function of signal controlling machine basically; Adjustment working time of each phase place is carried out the computing of public traffic in priority algorithm through signal processing module and is realized that signal controlling machine only carries out the driving of signal lamp;
When selecting the priority scheme of binding signal controller; The defeated module of triggering and micro-control then adopts the triggering output mode; The public traffic in priority controller is only according to detected bus number; Count each phase place and arrive the bus quantity at crossing, and only export the public transit vehicle information of each phase place of crossing, the public traffic in priority phase place is carried out calculation optimization and adjustment phase place working time by signal controlling machine.
6. public traffic in priority controller according to claim 1 is characterized in that: said interface module is made up of RS485 interface chip, RS232 interface chip and RS485 interface lightning protection circuit and interface selection etc.; Wherein
The RS485 interface chip is used for carrying out data communication with rfid interrogator; Chip adopts the difference transceiver SN75LBC184 with transient voltage inhibit feature; Be built-in with high-energy transition noise protective device, in order to improve the reliability of the transition noise on the anti-data cable;
The RS232 interface chip uses SP3232EB series RS-232 transceiver; Be used for carrying out exchanges data and the public transport priority signal controller being carried out the parameter setting in advance with outer PC; This chip charge pump power supply uses 0.1 μ F capacitor under 3.3V voltage, to operate, the function that is under an embargo of driver output and the charge pump with device under the low-power consumption shutdown mode.
7. public traffic in priority controller according to claim 6 is characterized in that: said RS485 interface lightning protection circuit adopts primary and secondary two-stage lightning protection circuit structure, and has PTC from the current-limiting protection circuit that recovers insurance; Wherein
Elementary lightning protection circuit is made up of four TED-485 anti-thunder tubes, and the anti-thunderbolt overvoltage protection between the line line and between line ground is provided respectively;
Secondary lightning protection circuit is made up of two transient state TVS pipe, is used to bear the voltage breakdown of 10/1000 μ s wave impulse power 600W, and this circuit is used for absorbing the peak voltage that circuit induces, with voltage clamp in safe range.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103680163A (en) * | 2013-12-03 | 2014-03-26 | 青岛海信网络科技股份有限公司 | Regional bus signal priority method based on bus demands |
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| CN103903431A (en) * | 2012-12-25 | 2014-07-02 | 刘伟南 | Vehicle detection apparatus |
| CN103903431B (en) * | 2012-12-25 | 2018-01-30 | 刘伟南 | A kind of vehicle detection apparatus |
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| CN103680163B (en) * | 2013-12-03 | 2016-01-27 | 青岛海信网络科技股份有限公司 | Based on the region bus signals mode of priority of public transport demand |
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| CN104575037B (en) * | 2014-12-22 | 2017-09-01 | 上海骏码交通科技有限公司 | A kind of bus priority control system and method |
| CN107067042A (en) * | 2017-05-17 | 2017-08-18 | 江苏本能科技有限公司 | Vehicle electron identifying classification processing method and system |
| CN107067042B (en) * | 2017-05-17 | 2019-12-31 | 江苏本能科技有限公司 | Automobile electronic identification classification processing method and system |
| CN108169747A (en) * | 2017-12-28 | 2018-06-15 | 南京慧尔视智能科技有限公司 | A kind of intersection induction control system and its method based on microwave |
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