CN111885538A - Wireless communication system and method for micro-rail vehicle control - Google Patents
Wireless communication system and method for micro-rail vehicle control Download PDFInfo
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- CN111885538A CN111885538A CN202010687091.6A CN202010687091A CN111885538A CN 111885538 A CN111885538 A CN 111885538A CN 202010687091 A CN202010687091 A CN 202010687091A CN 111885538 A CN111885538 A CN 111885538A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/403—Bus networks with centralised control, e.g. polling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
Abstract
The invention discloses a wireless communication system and a method for micro-rail vehicle control, wherein a rail line is divided into a plurality of sections through positioning marks, a rail bypass communication unit is arranged at the center of each section, the reliable communication range covered by the rail bypass communication unit is a communication section, each communication section is provided with a communication channel, the communication channels of adjacent communication sections are different, the rail bypass communication units are connected through a field bus, a vehicle-mounted communication unit is arranged on a carriage, the vehicle-mounted communication unit is connected with the rail bypass communication unit through switching the communication channels, the rail bypass communication unit distributes communication addresses to the vehicle-mounted communication unit, and the vehicle-mounted communication unit perform alternate time-sharing data exchange to realize information interaction of the rail bypass communication unit and the vehicle-mounted communication unit. The invention solves the problems that the communication of the existing micro-rail vehicle is easy to interfere and the real-time performance and the safety can not be guaranteed.
Description
Technical Field
The invention relates to the technical field of rail vehicle communication, in particular to a wireless communication system and a wireless communication method for micro-rail vehicle control.
Background
Personal rapid transit can be achieved with suspended wheeltrack vehicles with track widths below 600mm, referred to herein as micro-track systems. Reliable real-time communication between a vehicle and trackside equipment in a micro-track system is an important means for controlling and realizing automatic running of the micro-track vehicle.
The existing communication schemes mostly adopt open-space wireless communication equipment to exchange data with a control center for central control and scheduling, and have the problems that the communication distance is limited, and the communication is easily influenced and interfered by the environment; communication conflicts can arise when multiple vehicles communicate with a dispatch monitoring center at the same time. When the system is used for vehicle running control, the requirements on reliability, real-time performance and safety are difficult to meet.
Disclosure of Invention
Therefore, the invention provides a wireless communication system and a wireless communication method for micro-rail vehicle control, and aims to solve the problems that the existing micro-rail vehicle communication is easily interfered, and the real-time performance and the safety cannot be guaranteed.
In order to achieve the above purpose, the invention provides the following technical scheme:
according to the first aspect of the invention, a track line is divided into a plurality of sections through positioning marks, a track bypass communication unit is installed in the center of each section, the reliable communication range covered by the track bypass communication unit is a communication section, each communication section is provided with a communication channel, the communication channels of adjacent communication sections are different, the track bypass communication units are connected through a field bus, a vehicle-mounted communication unit is installed on a carriage and connected with the track bypass communication unit through switching the communication channels, the track bypass communication unit distributes communication addresses to the vehicle-mounted communication unit, the vehicle-mounted communication unit carries out time-sharing alternate data exchange with the vehicle-mounted communication unit, and information interaction between the track bypass communication unit and the vehicle-mounted communication unit is realized.
Further, the rail bypass communication unit is installed on the inner side of the tubular track or the outer side of the tubular track, and the communication antenna of the rail bypass communication unit is located on the inner side of the tubular track.
Furthermore, the rail bypass communication unit is provided with a communication channel in a communication section, when the vehicle enters different communication sections, the communication channel is switched to the corresponding communication channel, the vehicle is provided with a starting position identification device, and each vehicle has a unique ID number.
Furthermore, the off-track communication unit stores its own communication channel and communication transceiver signal strength, the communication channel of the communication section where the off-track communication unit is located is different from the communication channel of the adjacent communication section, and the same communication channel can be used only when the same communication channel needs to be separated by more than two communication sections and no communication collision occurs.
Furthermore, the positioning targets are arranged on the side of the track at equal intervals, channel number information is contained in the positioning targets, the carriage is provided with a positioning identification device, and the information of the positioning targets is identified by the positioning identification device to trigger the vehicle-mounted communication unit to switch communication channels.
Furthermore, the rail bypass communication units are connected through field buses, the field buses are connected through a bus bridge, and the field buses are connected with the control center and receive configuration update data of the control center.
Further, the vehicle-mounted communication unit stores a vehicle ID number and a comparison table of each communication section and a communication channel carrier frequency, and the vehicle-mounted communication unit has an initial default communication address.
Further, when a plurality of vehicles exist in the communication interval, the rail-side communication unit in the communication interval dynamically allocates communication addresses to the plurality of vehicle-mounted communication units, the rail-side communication unit actively sends out communication requests, addressed vehicles respond, the rest vehicles keep silent, the rail-side communication unit communicates with the vehicles in the communication interval in turn, and the vehicle ID number is bound with the dynamic communication addresses.
Furthermore, the rail bypass communication unit and the vehicle-mounted communication unit are provided with two communication modules, the two communication modules adopt different communication channels for simultaneous communication, and one communication module breaks down and is automatically switched to the other communication module for communication.
According to a second aspect of the invention, a wireless communication method for micro-rail vehicle control is disclosed, the method comprising:
the starting position identification device on the vehicle identifies the starting position, determines a communication section where the current vehicle is located, and switches the communication channel of the vehicle-mounted communication unit to the same communication channel as the communication section;
during the moving process of the vehicle, identifying a positioning mark through a positioning identification device, entering different communication intervals, and adjusting a communication channel of a vehicle-mounted communication unit;
the rail-side communication unit distributes communication addresses to a plurality of vehicles in a communication interval, the rail-side communication unit actively initiates communication, addressed vehicles respond, and the rest vehicles keep silent until the rail-side communication unit communicates with all vehicles in turn to realize information interaction;
when the vehicle enters the next communication interval and the command of the rail bypass communication unit of the previous communication interval is responded for the last time, the leaving information is sent out in the response, the rail bypass communication unit does not call the vehicle any more, the vehicle is deleted from the communication polling list, and the communication address is recovered;
the field bus is connected with the control center and used for receiving configuration updating data of the control center, and the vehicle-mounted communication unit receives the configuration updating data of the dispatching monitoring center through a vehicle-mounted Wifi or 4G/5G communication network.
The invention has the following advantages:
the invention discloses a wireless communication system and a method for controlling a micro-rail vehicle, wherein signals of a rail bypass communication unit and a vehicle-mounted communication unit are mainly concentrated in a steel rail, and the communication distance can be extended by means of a metal pipeline; meanwhile, signal collision with adjacent line communication can be avoided, the interference of external signals is not easy to happen, and the problems of building shielding and the like do not exist; the signal power required by communication is small, and the communication range and the communication power are convenient to adjust.
The method of wireless signal coverage in a segmented small range is adopted to realize line communication coverage with any length and shape; using communication channel division to avoid adjacent area communication conflict; the vehicle determines a communication channel according to the positioning, so that a communication protocol is simplified, and the requirements of intensive and real-time communication are met;
the communication adopts a master-slave control mode, and a communication addressing and time-sharing mode is adopted, so that the problem of one-to-many communication conflict between the trackside equipment and a plurality of vehicles in the interval is effectively solved; the communication cycle time is determined, and the real-time communication requirement of a plurality of vehicles in marshalling operation or on a station can be met;
the rail bypass communication units are connected with each other through a field bus, so that the requirement of transmitting control data along a driving line is met, the rail bypass communication units can filter vehicle information and provide the vehicle information to a vehicle as control input, and the dependence of vehicle control on a dispatching center in driving can be reduced or avoided; the special communication system formed in the way is higher in safety, the usability of the communication system is improved by adopting a double-path redundancy mode, and the real-time performance and the safety of signal transmission are guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a schematic structural diagram of a wireless communication system for micro-rail vehicle control according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a track-by-track communication unit location of a wireless communication system for micro-track vehicle control according to an embodiment of the present invention;
fig. 3 is a schematic diagram of another track-by-track communication unit location of a wireless communication system for micro-track vehicle control according to an embodiment of the present invention;
fig. 4 is a schematic diagram of distribution and coverage of rail-side communication units of a wireless communication system for micro-rail vehicle control according to an embodiment of the present invention;
fig. 5 is a schematic diagram of the distribution and coverage of a bypass unit with a split switch in a wireless communication system for micro rail vehicle control according to an embodiment of the present invention;
fig. 6 is a schematic diagram of the distribution and coverage of a bypass unit with a combined switch in a wireless communication system for micro rail vehicle control according to an embodiment of the present invention;
FIG. 7 is a communication channel distribution diagram of a wireless communication system for micro-rail vehicle control according to an embodiment of the present invention;
fig. 8 is a communication timeslot division diagram of a wireless communication system for micro-rail vehicle control according to an embodiment of the present invention;
in the figure: the system comprises a 1-rail bypass communication unit, a 2-vehicle-mounted communication unit, a 3-field bus, a 4-bus bridge, a 5-dispatching monitoring center, a 6-positioning mark, a 7-positioning identification device, an 8-tubular rail and a 9-communication antenna.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, the embodiment discloses a wireless communication system for controlling a micro-rail vehicle, the system divides a rail line into a plurality of sections through a positioning standard 6, a rail bypass communication unit 1 is installed at the center of each section, a reliable communication range covered by the rail bypass communication unit 1 is a communication section, each communication section is configured with a communication channel, the communication channels of adjacent communication sections are different, the rail bypass communication units 1 are connected through a field bus 3, a vehicle-mounted communication unit 2 is installed on a carriage, the vehicle-mounted communication unit 2 is connected with the rail bypass communication unit 1 through switching the communication channels, the rail bypass communication unit 1 allocates communication addresses to the vehicle-mounted communication unit 2, and performs alternate time-sharing data exchange with the vehicle-mounted communication unit 2, so that information interaction between the rail bypass communication unit 1 and the vehicle-mounted communication unit 2 is realized.
Referring to fig. 2 and 3, the rail-side communication unit 1 is installed inside the tubular rail 8 or outside the tubular rail 8, the communication antenna 9 of the rail-side communication unit 1 is located inside the tubular rail 8, the vehicle-mounted communication unit 2 of the vehicle is installed on the running gear inside the tubular rail 8, and the communication antenna 9 is installed at a position ensuring that the communication is not seriously blocked by the metal structure on the running gear. The communication between the vehicle-mounted communication unit 2 and the track-side communication unit 1 can adopt 2.4G, 433M or 900M carrier frequency range communication modules.
According to the wireless characteristic of a single communication unit and the control strategy of vehicle running, a track line is divided into a plurality of sections with approximately equal lengths, a track bypass communication unit 1 is arranged in the track near the center position of each section, and the section where the reliable communication range with the vehicle can cover is located is called the set communication section of the unit. The connections of the rail-side signalling units 1, their respective covered range of intervals, are shown with reference to fig. 4. Between the two position indicators 6 is a section, each section is provided with a track-side communication unit 1, and the communication range thereof covers the section (set communication section) and two adjacent sections (actual coverage sections). The solid line segment with an arrow indicates a set communication section of the track side communication unit 1 with which a vehicle in the section should communicate; the arrow also indicates the direction of travel of the vehicle. The dotted line indicates a range in which the radio signal of the track-side communication unit 1 can be influenced, and the range does not exceed the adjacent sections before and after the set communication section. The arrangement between switch sections is shown with reference to fig. 5 and with reference to fig. 6. In fig. 5, the split switch section includes two switches, and the set communication section k of the track-side communication unit 1k in the section includes 4 sections actually covered by the two split switches. In fig. 6, the set communication sections of the trackside communication units 1k and k' in the two sections forming the merged turnout partially overlap, and the actual coverage range also has an overlapping section.
The rail-mounted communication unit 1 is used for preventing air collision in the communication process of different intervals during intensive communication, a communication channel is configured in the communication interval of the rail-mounted communication unit 1, when a vehicle enters different communication intervals, the vehicle is switched to the corresponding communication channel, and a starting position recognition device is mounted on the vehicle and used for recognizing the communication interval where the current vehicle is located. The vehicle-mounted communication unit 2 stores a vehicle ID number and a comparison table of each communication section and the carrier frequency of the communication channel, and tunes to the corresponding communication channel according to the communication section.
The positioning targets 6 are arranged on the side edge of the track at equal intervals, channel number information is contained in the positioning targets 6, the positioning identification device 7 is arranged on the carriage, and the information of the positioning targets 6 is identified by the positioning identification device 7 to trigger the vehicle-mounted communication unit 2 to switch communication channels. And identifying an interval starting positioning mark 6 installed beside the track as a basis for switching channels, wherein the positioning mark 6 can adopt an RFID label. The content of the location mark 6 may contain channel number information, or a comparison table of the location mark number and the communication channel may be stored in the vehicle-mounted communication unit 2. To facilitate coping with the influence of an accident on the communication control, the vehicle should hold the configuration parameters, the vehicle position information, and the communication address in a nonvolatile manner. Each vehicle has its own unique ID number. The track-side communication unit 1 stores its own communication channel and communication transceiver signal strength, the communication channel of the communication section where the track-side communication unit 1 is located is different from the communication channel of the adjacent communication section, and the same communication channel can be used only when the same communication channel needs to be separated by more than two communication sections and no communication collision occurs.
The communication power of the communication unit is adjusted so that one track side communication unit 1 can reliably communicate with the vehicle in the local area, and the signal intensity of the adjacent area is gradually reduced. The interval length setting and the control of the communication signal strength are such that two vehicle-to-rail communication processes using the same frequency channel do not generate detectable collisions when separated by more than two intervals. Referring to fig. 7, on a line, since the rf signal of the track-side communication unit 1 in one section may affect two adjacent sections before and after the track-side communication unit, at least two sections are separated between the set communication sections using the same channel, and more sections may be separated under the condition that the number of channels is sufficient.
When a plurality of vehicles exist in the communication interval, the rail bypass communication unit 1 initiates communication for the main controller, and the vehicle communication unit 2 can only passively respond to a communication instruction of the rail bypass communication unit 1; the rail-side communication unit 1 in the communication interval dynamically allocates communication addresses to the vehicle-mounted communication units 2, the rail-side communication unit 1 actively sends out communication requests, addressed vehicles respond, the rest vehicles keep silent, the rail-side communication unit 1 communicates with the vehicles in the communication interval in turn, and the vehicle ID numbers are bound with the dynamic communication addresses.
The track side communication unit 1 adopts a time-sharing strategy to communicate with the vehicles in the section in turn. A communication cycle time period (for example 100ms) is divided into a plurality of (for example 10) equal time slots, communication with a vehicle in the interval is carried out in one time slot, the communication process should be completed within the limited time of the time slot, and the communication is considered to be failed if the limited time is exceeded. The track side communication unit 1 starts the next communication cycle after exchanging data with all vehicles in the zone by turns; each cycle is completed within a specified time period to ensure time certainty of the wayside-vehicle communication;
the division of the communication polling period and the time slot depends on the requirement of the driving control on the communication period and the possible number of vehicles in an interval. The number of time slots in one cycle is larger than the maximum number of vehicles in the interval, the length of the time slot is required to ensure enough communication data exchange time, and the time such as error retransmission and the like which can be used is considered. Referring to fig. 8, a scheme using 10 slots is shown, if each slot is 10ms, and the communication polling period is 100ms, the real-time requirement of vehicle control data exchange is satisfied. Each time slot also corresponds to a communication address.
The communication address of the vehicle in one communication section is dynamically allocated by the rail-side communication unit 1 of the communication section. A vehicle uses a default address that was agreed upon in advance, such as address 0 of fig. 8, when the vehicle just entered the communication zone. Waiting for a call from the rail side signaling unit 1; after the first communication with the on-track communication unit 1 is successful, a communication address different from the default address is obtained from the on-track communication unit 1 for subsequent communication, and each vehicle sets a unique vehicle ID for binding with the dynamic communication address.
When a vehicle is informed to enter the next communication interval according to position detection, the vehicle responds to the command of the track bypass communication unit 1 in the previous communication interval for the last time and sends out leaving information in response; when notified, the on-track signaling unit 1 removes the vehicle from the call, deletes the vehicle from the communication polling list, and returns its communication address for the new vehicle. Then, the vehicle switches the communication channel and waits for a new section of the track-side communication unit 1 to call again at the default address.
When the vehicle-mounted communication unit 2 fails and cannot normally send out information leaving one section, the track side communication unit 1 in the section can confirm that the vehicle leaves the section through the information sent by the track side unit in the next section on the field bus 3, and stops inquiring the vehicle and recovers the communication address. When the communication addresses of a plurality of vehicle-mounted communication units 2 in one interval are lost due to unexpected power failure and other conditions, in order to prevent collision caused by the fact that more than two vehicle-mounted communication units 2 simultaneously respond to the trackside units of the default addresses, random delay before response can be set, and address allocation can be completed as soon as possible.
The rail bypass communication unit 1 is connected through a field bus 3, the field buses 3 are connected through a bus bridge 4, the field bus 3 is connected with a control center and receives configuration updating data of the control center, and the vehicle-mounted communication unit 2 receives the configuration updating data of the dispatching monitoring center 5 through vehicle-mounted Wifi or 4G/5G and other communication modes.
Under the condition that the number of communication channels is enough, a two-way redundancy method can be selected to improve the communication availability, two communication modules are configured for each track bypass communication unit 1 and each vehicle-mounted communication unit 2, and the two communication modules adopt different communication channels for simultaneous communication; and when the data receiving party judges that one module data is wrong or overtime and the other module data is normal, switching to the communication data of the other module. The communication failure is determined only when communication errors occur in both modules, improving the usability of the communication system.
Example 2
A wireless communication method for micro-rail vehicle control, the method comprising:
the initial position recognition device on the vehicle recognizes the initial position, determines the communication section where the current vehicle is located, and switches the communication channel of the vehicle-mounted communication unit 2 to the same communication channel as the communication section;
during the moving process of the vehicle, the positioning mark 6 is identified through the positioning identification device 7, the vehicle enters different communication intervals, and the communication channel of the vehicle-mounted communication unit 2 is adjusted;
the rail-side communication unit 1 allocates communication addresses to a plurality of vehicles in a communication interval, the rail-side communication unit 1 actively initiates communication, addressed vehicles respond, and the rest vehicles keep silent until the rail-side communication unit 1 communicates with all vehicles in turn to realize information interaction;
when the vehicle enters the next communication interval and the command of the rail bypass communication unit 1 of the previous communication interval is responded for the last time, the leaving information is sent out in the response, the rail bypass communication unit 1 does not call the vehicle any more, the vehicle is deleted from the communication polling list, and the communication address is recovered;
the field bus 3 is connected with the control center and used for receiving configuration updating data of the control center, and the vehicle-mounted communication unit 2 receives the configuration updating data of the dispatching monitoring center 5 through a vehicle-mounted Wifi or 4G/5G communication network.
In the wireless communication method for controlling the micro-rail vehicle disclosed by the embodiment, signals of the rail bypass communication unit 1 and the vehicle communication unit 2 are mainly concentrated in a steel rail, and the communication distance can be extended by means of a metal pipeline; meanwhile, signal collision with adjacent line communication can be avoided, the interference of external signals is not easy to happen, and the problems of building shielding and the like do not exist; the signal power required by communication is small, and the communication range and the communication power are convenient to adjust.
The method of wireless signal coverage in a segmented small range is adopted to realize line communication coverage with any length and shape; using communication channel division to avoid adjacent area communication conflict; the vehicle determines a communication channel according to the positioning, so that a communication protocol is simplified, and the requirements of intensive and real-time communication are met;
the communication adopts a master-slave control mode, and a communication addressing and time-sharing mode is adopted, so that the problem of one-to-many communication conflict between the trackside equipment and a plurality of vehicles in the interval is effectively solved; the communication cycle time is determined, and the real-time communication requirement of a plurality of vehicles in marshalling operation or on a station can be met;
the rail bypass communication units 1 are connected with each other through the field bus 3, the requirement of transmitting control data along a driving line is met, vehicle information can be filtered and provided to a vehicle as control input by the rail bypass communication units 1, and the dependence of vehicle control on a dispatching center in driving can be reduced or avoided; the special communication system formed in the way is higher in safety, the usability of the communication system is improved by adopting a double-path redundancy mode, and the real-time performance and the safety of signal transmission are guaranteed.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A wireless communication system for micro-rail vehicle control is characterized in that a rail line is divided into a plurality of sections through positioning marks, a rail bypass communication unit is installed in the center of each section, the reliable communication range covered by the rail bypass communication unit is a communication section, each communication section is provided with a communication channel, the communication channels of adjacent communication sections are different, the rail bypass communication units are connected through a field bus, a vehicle-mounted communication unit is installed on a carriage and connected with the rail bypass communication unit through switching the communication channels, the rail bypass communication unit distributes communication addresses to the vehicle-mounted communication unit, and the vehicle-mounted communication unit exchanges data in turns in time-sharing mode to achieve information interaction of the rail bypass communication unit and the vehicle-mounted communication unit.
2. The wireless communication system for the control of a micro-rail vehicle as claimed in claim 1, wherein the rail bypass communication unit is installed inside the tubular track or outside the tubular track, and the communication antenna of the rail bypass communication unit is located inside the tubular track.
3. The wireless communication system for micro-rail vehicle control as claimed in claim 1, wherein the rail-side communication unit configures a communication channel in a communication section thereof, and switches to the corresponding communication channel when the vehicle enters a different communication section, and the vehicle is mounted with a home position identifying device, each vehicle having its own unique ID number.
4. The wireless communication system for micro-rail vehicle control as claimed in claim 3, wherein the rail-side communication unit stores its own communication channel and communication transceiver signal strength, the communication channel of the communication section where the rail-side communication unit is located is different from the communication channel of the adjacent communication section, and the same communication channel is used when it is necessary to separate more than two communication sections and no communication collision occurs.
5. The wireless communication system for the control of the micro-rail vehicle as claimed in claim 1, wherein the location markers are installed at equal intervals on the side of the rail, the location markers include channel number information, a location identification device is installed on the carriage, and the information of the location markers is identified by the location identification device to trigger the vehicle-mounted communication unit to switch the communication channel.
6. The wireless communication system for the control of the micro-rail vehicle as claimed in claim 1, wherein the rail-side communication units are connected through a field bus, the field bus is connected through a bus bridge, and the field bus is connected with the control center to receive the configuration update data of the control center.
7. The wireless communication system for the control of the micro-rail vehicle as claimed in claim 1, wherein the vehicle-mounted communication unit stores a vehicle ID number and a look-up table of each communication section and a carrier frequency of a communication channel, and the vehicle-mounted communication unit has an initial default communication address.
8. The wireless communication system for micro-rail vehicle control as claimed in claim 1, wherein when there are multiple vehicles in the communication zone, the rail-side communication unit in the communication zone dynamically allocates communication addresses to the multiple vehicle-mounted communication units, the rail-side communication unit actively sends out communication requests, addressed vehicles respond, the rest vehicles keep silent, the rail-side communication unit alternately communicates with the vehicles in the communication zone, and the vehicle ID number is bound with the dynamic communication addresses.
9. The wireless communication system for the control of the micro-rail vehicle as claimed in claim 1, wherein the rail bypass communication unit and the vehicle communication unit are configured with two communication modules, the two communication modules adopt different communication channels for simultaneous communication, and one communication module fails and automatically switches to the other communication module for communication.
10. A wireless communication method for micro-rail vehicle control, the method comprising:
the starting position identification device on the vehicle identifies the starting position, determines a communication section where the current vehicle is located, and switches the communication channel of the vehicle-mounted communication unit to the same communication channel as the communication section;
during the moving process of the vehicle, identifying a positioning mark through a positioning identification device, entering different communication intervals, and adjusting a communication channel of a vehicle-mounted communication unit;
the rail-side communication unit distributes communication addresses to a plurality of vehicles in a communication interval, the rail-side communication unit actively initiates communication, addressed vehicles respond, and the rest vehicles keep silent until the rail-side communication unit communicates with all vehicles in turn to realize information interaction;
when the vehicle enters the next communication interval and the command of the rail bypass communication unit of the previous communication interval is responded for the last time, the leaving information is sent out in the response, the rail bypass communication unit does not call the vehicle any more, the vehicle is deleted from the communication polling list, and the communication address is recovered;
the field bus is connected with the control center and used for receiving configuration updating data of the control center, and the vehicle-mounted communication unit receives the configuration updating data of the dispatching monitoring center through a vehicle-mounted Wifi or 4G/5G communication network.
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| CN115665786A (en) * | 2022-12-29 | 2023-01-31 | 卡斯柯信号(北京)有限公司 | Reverse switching method and device for train-ground wireless communication system |
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