CN102289693A - Electronic license plate system based on active radio frequency recognition and communication control method thereof - Google Patents
Electronic license plate system based on active radio frequency recognition and communication control method thereof Download PDFInfo
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- CN102289693A CN102289693A CN2011102246178A CN201110224617A CN102289693A CN 102289693 A CN102289693 A CN 102289693A CN 2011102246178 A CN2011102246178 A CN 2011102246178A CN 201110224617 A CN201110224617 A CN 201110224617A CN 102289693 A CN102289693 A CN 102289693A
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Abstract
The invention discloses an electronic license plate system based on active radio frequency recognition and a communication control method thereof, relating to the technical fields of an active radio frequency recognition technology and a vehicle management technology thereof. The electronic license plate tag can detect the existence of an electronic driver tag in real time, obtain data of the electronic driver tag and send the self data and the data of the electronic driver tag together to a reader-writer; the electronic license plate tag starts detecting the electronic driver tag after being awakened from a dormant state at a set period, and the electronic driver tag is awakened from the dormant state at the set period and sends the self data; and the electronic license plate tag can automatically regulate an awakening clock to realize the function of synchronous low-power consumption reception with the awakening clock of the electronic driver tag. The electronic driver tag is directly subjected to information interaction with the electronic license plate tag, and the state information fed back to the reader-writer by the electronic license plate tag ensures that managers can achieve the purposes of effective vehicle management, real-time monitoring, vehicle recognition, vehicle burglary prevention and the like.
Description
Technical field
The present invention relates to REID short-distance and medium-distance radio communication micropower control technology, vehicle management technical field, especially a kind of electronic vehicle license plate system and communication control method thereof based on active radio-frequency (RF) identification.
Background technology
Along with the development of technology of Internet of things, it is very general at present that radio RF recognition technology is applied to vehicle management, and present stage mainly contains following three kinds at the vehicle anti-theft Managed Solution:
Summary of the invention
The objective of the invention is to disclose a kind of electronic vehicle license plate system and communication control method thereof based on active radio-frequency (RF) identification; Design low-cost, low-power consumption that driver's electronic tag wherein and the communication between the car plate electronic tag have been adopted, driver's electronic tag can be directly and the car plate electronic tag carry out information interaction, the status information that feeds back to read write line by the car plate electronic tag reaches vehicle management, monitoring in real time, identification, purpose such as antitheft, has overcome many deficiencies of above-mentioned technology.
The technical solution that realizes the object of the invention is as follows: a kind of electronic vehicle license plate system communication control method based on active radio-frequency (RF) identification comprises radio-frequency identification reader/writer, car plate electronic tag and driver's electronic tag of support system; Described car plate electronic tag can detect the existence of driver's electronic tag in real time and obtain the data of driver's electronic tag, and its data and driver's electronic tag data are sent to read write line together; Described car plate electronic tag begins to detect driver's electronic tag with the cycle of setting after dormant state is waken up, described driver's electronic tag wakes and send its data with the cycle of setting up from dormant state; The car plate electronic tag can be adjusted voluntarily and wake clock up, to realize waking up with driver's electronic tag the function of clock synchronization, low-power consumption reception.
Described electronic vehicle license plate system communication control method is characterized in that, after the car plate electronic tag wakes up from dormant state, detects driver's electronic tag and to carry out the process step of data interaction as follows with radio-frequency identification reader/writer:
A kind of electronic vehicle license plate system based on active radio-frequency (RF) identification comprises radio-frequency identification reader/writer, car plate electronic tag and driver's electronic tag of support system; Its radio-frequency identification reader/writer comprises microcontroller, Transmit Receive Unit, interface circuit, power circuit and antenna; Described car plate electronic tag comprises the low-power consumption microcontroller, wakes clock up, motion sensor, Transmit Receive Unit, antenna and electric power management circuit; Described driver's electronic tag comprises the low-power consumption microcontroller, wakes clock up, Transmit Receive Unit, antenna and battery.Described car plate electronic tag is connected with the P1.6 pin with the clock pin P1.7 pin corresponding with microcontroller chip that wake up that driver's electronic tag adopts; The Transmit Receive Unit of described read write line, car plate electronic tag and driver's electronic tag is connected with microcontroller respectively by synchronous communication serial ports SPI separately; The motion sensor of described car plate electronic tag is connected with an I/O interface of microcontroller; Described car plate electronic tag and driver's electronic tag all adopt powered battery.The microcontroller that described car plate electronic tag department and organic electronic label adopt is the C8051F982 chip.What described Transmit Receive Unit adopted is 2.4GHz radio transmitting and receiving chip nRF24L01 chip.Electronic tag in the course of the work, the power consumption maximum be the emission or receiving radio data, for guaranteeing that further car plate electronic tag and driver's electronic tag can both satisfy the low-power consumption requirement, take following measure: 1, driver's electronic tag periodically sends data, and the car plate electronic tag is when receiving driver's electronic tag, the time window that receives needs the transmission cycle greater than driver's electronic tag, therefore driver's electronic tag transmission cycle need be reduced.Each time that sends of driver's electronic tag is of short duration, is generally less than 200 microseconds, and to send institute's power consumption less at every turn.2, the wake-up period of car plate electronic tag is designed to the integral multiple of driver's electronic tag, makes things convenient for the synchronous of car plate electronic tag time of reception and driver's electronic tag transmitting time.3, driver's electronic tag and car plate electronic tag adopt the mode of receiver address sign indicating number coupling, guarantee that the car plate electronic tag can only receive its pairing driver's electronic tag, and can not receive other driver's electronic tag and waste the processing time.
Compared with the prior art, the present invention has outstanding advantage and beneficial effect:
(1) data of read write line collection car plate electronic tag promptly can obtain vehicle and driver's information, under the situation that a large amount of vehicles are assembled, also can carry out data aggregation efficiently immediately.
(2) car plate electronic tag and driver's electronic tag adopt the address code coupling, and the car plate electronic tag can not receive other driver's label, has saved the processing time, has saved power consumption yet.
(3) car plate electronic tag and driver's electronic tag carry out clock synchronization, and synchronously back car plate electronic tag enters detected state and just receives driver's electronic tag, has saved the time of lasting reception, receive driver's electronic tag usually after synchronously in 1 millisecond at once.When vehicle was in cruising always, car plate label power consumption was very low like this.
(4) the car plate electronic tag prolongs the time interval of detecting driver's electronic tag when continuing to can not receive driver's electronic tag.Be in when illegally travelling at vehicle like this, electronic tag can keep lower power consumption always.
(5) supvr directly carries out information interaction with the car plate electronic tag by driver's electronic tag, and the status information that the car plate electronic tag feeds back to read write line can reach purposes such as effective management vehicle, real-time monitoring, vehicle identification, vehicle anti-theft.
Description of drawings
Fig. 1 .1, Fig. 1 .2 are respectively one embodiment of the invention, and described system constitutes and the working method synoptic diagram.
Fig. 2 is that described car plate electronic tag, driver's electronic tag and read write line communicate the steps flow chart synoptic diagram.
Fig. 3 is a car plate electronic tag program circuit step synoptic diagram of the present invention.
Fig. 4 is a car plate Electronic Tag Structure block diagram representation of the present invention.
Fig. 5 is driver's Electronic Tag Structure block diagram representation of the present invention.
Fig. 6 is a car plate electronic tag circuit connection diagram of the present invention.
Fig. 7 is the sequential synoptic diagram that does not adopt clock synchronization in car plate label of the present invention and the driver's label.
Fig. 8 is the sequential synoptic diagram after the employing clock synchronization in car plate label of the present invention and the driver's label.
Embodiment
Provide embodiment in conjunction with the accompanying drawings, and the present invention is described in further detail.
Referring to Fig. 1 .1, Fig. 1 .2 is one embodiment of the invention.As can be seen, a kind of electronic vehicle license plate system communication control method based on active radio-frequency (RF) identification of the present invention comprises radio-frequency identification reader/writer, car plate electronic tag and driver's electronic tag of support system.The car plate electronic tag can detect the existence of driver's electronic tag in real time and obtain the data of driver's electronic tag in 10 meters scopes, and its data and driver's electronic tag data are sent to 150 meters read write lines in the scope together; The car plate electronic tag is that the RTC wakeup time is spaced apart 1 second with the cycle of setting, after waking up, dormant state begins to detect driver's electronic tag, driver's electronic tag promptly disposes RTC with the cycle of setting and wakes up and enable, and wakeup time is spaced apart 250 milliseconds, enters dormant state then.Wake and send its data up from dormant state; The car plate electronic tag can be adjusted voluntarily and wake clock up, to realize waking clock synchronization up with driver's electronic tag, reaches the purpose that low-power consumption receives.Referring to Fig. 4, Fig. 5, Fig. 6 as can be known, the read write line among the present invention comprises microcontroller, Transmit Receive Unit, interface circuit, power circuit and antenna composition.Wherein microcontroller is by serial or parallel data line control Transmit Receive Unit, and Transmit Receive Unit connects antenna, and interface circuit comprises RS232, RS485 and Ethernet interface.The car plate electronic tag comprises low-power consumption microcontroller, Transmit Receive Unit, electric power management circuit, motion sensor, wakes clock and antenna up.Wherein sensor can characterize the motion or the stationary state of vehicle, and microcontroller is gathered motion sensor data, and the control Transmit Receive Unit carries out wireless data transceiving, and Transmit Receive Unit is connected with antenna.Waking clock up generally is that microcontroller is integrated, if external, then regularly to microcontroller output wake-up signal.
Driver's electronic tag comprises low-power consumption microcontroller, Transmit Receive Unit, battery, wakes clock and antenna up.Wherein the microprocessor controls Transmit Receive Unit carries out wireless data transceiving, and Transmit Receive Unit is connected with antenna.Waking clock up generally is that microcontroller is integrated, if external, then regularly to microcontroller output wake-up signal.
The car plate electronic tag is connected with the P1.6 pin with the clock pin P1.7 pin corresponding with microcontroller chip that wake up that driver's electronic tag adopts; The Transmit Receive Unit of read write line, vehicle electric label and driver's electronic tag is connected with microcontroller respectively by synchronous communication serial ports SPI separately; The motion sensor of car plate electronic tag is connected with an I/O interface of microcontroller; Car plate electronic tag and driver's electronic tag all adopt powered battery.
The microcontroller of read write line is LPC1758 in the present embodiment, control the Transmit Receive Unit of forming by 2.4GHz radio transmitting and receiving chip nRF24L01 and peripheral circuit thereof by the SPI interface, antenna adopts the 14dBi plate aerial, interface circuit comprises that the RS232 interface conversion circuit connects the serial ports 0 of LPC1758, the RS485 interface conversion circuit connects the serial ports 1 of LPC1758, networked physics layer chip DP83848 connects the Ethernet interface of LPC1758, the RJ45 interface TBJ011B of DP83848 connecting band network transformer, read write line adopt outside direct current 5V power supply.
The microcontroller of driver's electronic tag has adopted the single-chip microcomputer C8051F982 that a volume is little, cost is low, and the 32.768KHz crystal oscillator in the chip external world has been adopted in the clock source of microcontroller RTC.RF processing unit is identical with read write line, is connected with microcontroller by the SPI data-interface.Antenna adopts the PCB printed antenna.Driver's electronic tag adopts 500 MAH 3V button cells directly to power.
Car plate electronic tag microcontroller has adopted the microcontroller chip C80521F982 the same with driver's electronic tag, chip VDD pin connects the 3.3V voltage of Power Management Unit output, the passive crystal oscillator X2 of chip P1.7 pin and the external 32.768KHz of P1.6 pin provides system required accurate RTC clock source.The pin that the MISO of single-chip microcomputer, MOSI, SCK, CE, CSN, FINT pin are corresponding with radio frequency chip respectively connects.The same PCB printed antenna that adopts of car plate electronic tag with driver's electronic tag, car plate electronic tag microcontroller P0.5 pin is by first pin of current-limiting resistance R5, another pin of R5 is connected the back and is connected with the anode of motion sensor J3 with first pin of external pull-up resistor R4, the crus secunda of R4 connects the DC voltage of 3.3V, the negativing ending grounding of motion sensor J3.The car plate electronic tag uses motion sensor to be connected with the input port of microcontroller by behind described pull-up resistor and the current-limiting resistance, can microcontroller be waken up from dormancy by the port match function of microcontroller.The car plate electronic tag uses the power supply of 800 MAH 3.7V chargeable lithium cells, and the power management of car plate electronic tag partly comprises 3.7V charging circuit and 3.3V mu balanced circuit.
It is the order of computing machine or other controllers that read write line receives host computer by data-interface, carries out the label or the work of read write tag of gathering, and when receiving the order of gathering label, configuration nRF24L01 enters accepting state, after receiving data is passed to host computer.
After driver's electronic tag powers on, hardware resources such as the synchronous communication serial ports SPI of initialization microcontroller C8051F982, and configuration RTC wakes up and enables, wakeup time is spaced apart 250 milliseconds, enters dormant state then.After RTC wakes microcontroller up, nRF24L01 is configured to sending mode, and sends data with the unique address sign indicating number, wherein the unique address sign indicating number promptly is considered as driver's identifier, and data can be other information, as name driver etc.After transmission finishes nRF24L01 is configured to dormancy, microcontroller also enters dormant state, waits for next time waking up of RTC.
After the car plate electronic tag powers on, the hardware resource of initialization microcontroller C8051F982, initialization micro controller system clock also disposes two kinds of wake source of port match that RTC and motion sensor connect and enables, the RTC wakeup time is spaced apart 1 second, the receiver address of configuration nRF24L01 is that driver's label of its correspondence sends the address, enters dormant state then.After microcontroller is waken up, carry out by following process step, referring to Fig. 2, Fig. 3:
Referring to Fig. 7, Fig. 8 as can be known car plate electronic tag and driver's electronic tag do not adopt and adopt clock synchronization after the sequential comparing result be:
Under the situation that does not adopt clock synchronization, driver's electronic tag wakes up with the timing 250ms cycle and sends a secondary data, each regularly 1 second cycle of car plate electronic tag begins to receive driver's label after waking up, because the time that begins to receive not necessarily just is the transmitting time of driver's electronic tag, so need the lasting wait of a period of time, the time of waiting for is at random, and the longest may be 250ms.Under the situation that adopts clock synchronization, it is synchronous that the car plate electronic tag receives clock and the driver's electronic tag of adjusting self behind driver's electronic tag, after finishing synchronously, when timing wake-up next time, the time point that begins to receive driver's electronic tag just is the time point that driver's electronic tag begins to send.Be received in the 500us and can finish.Carry out a clock adjustment after finishing receiving again at every turn, guarantee next time synchronously.Receive consuming time all very short like this, at every turn.
The present invention specifically uses course of work embodiment: after read write line and electronic tag all power on, the supvr uses PC to pass through serial ports or network interface sends instruction to read write line, after receiving to receive the instruction of car plate electronic labeling information, read write line begins monitoring reception, the car plate electronic tag can send the state and the ID of vehicle to read write line in certain time interval, the state of vehicle mainly contains static, legal three states that travel, illegally travel.Vehicle is under actionless situation, the car plate electronic tag can regularly send static status information to read write line, the vehicle user carries the driver's electronic tag with the vehicle coupling, the user directly drives the vehicle of oneself in this case, and read write line can be received legal status information of travelling and pass to PC by serial ports or network interface.If vehicle periphery is not and department's electronics machine label of self coupling, when vehicle was received extraneous touching, read write line can be received the status information of illegally travelling and pass to PC by serial ports or network interface.The supvr can go to read and write the user profile of vehicle at any time by command adapted thereto simultaneously.
The present invention is used for electric motor car management implementation example, and implementation result shows; Whether read write line can read simultaneously greater than 100 car plate electronic tag datas, and discern vehicle immediately and be in and do not have correct driver's electronic tag state; The average working current of driver's electronic tag is less than 25 microamperes, and battery serviceable life was above 2 years; If the car plate electronic tag is under 24 hours illegal travel situations of power consumption maximum, battery can support also more than 30 days that if carry driver's electronic tag cruising, battery once charges and can use more than 1 year.
The above is the preferred embodiments of the present invention only, is not limited to the present invention; For a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. electronic vehicle license plate system communication control method based on active radio-frequency (RF) identification comprises radio-frequency identification reader/writer, car plate electronic tag and driver's electronic tag of support system; It is characterized in that described car plate electronic tag can detect the existence of driver's electronic tag in real time and obtain the data of driver's electronic tag, and its data and driver's electronic tag data are sent to read write line together; Described car plate electronic tag begins to detect driver's electronic tag with the cycle of setting after dormant state is waken up, described driver's electronic tag wakes and send its data with the cycle of setting up from dormant state; The car plate electronic tag can be adjusted voluntarily and wake clock up, to realize waking up with driver's electronic tag the function of clock synchronization, low-power consumption reception.
2. electronic vehicle license plate system communication control method according to claim 1 is characterized in that, after the car plate electronic tag wakes up from dormant state, detects driver's electronic tag and to carry out the process step of data interaction as follows with radio-frequency identification reader/writer:
Step 1, judge that wake source is that sensor wakes or wakes up clock up and wakes up, if waken up by sensor, show that vehicle is in motion state, microcontroller can write down this information, continues dormancy then; Wake up if wake clock up, then enter step 2;
Step 2, microcontroller are checked sensor record information, if vehicle is a stationary state, then enter step 7 and read write line communicates; If vehicle is kept in motion, judge before the vehicle that whether to be repeatedly illegal state promptly set vehicle continuous state of not receiving driver's electronic tag for three times under motion state, if enter step 5; Otherwise, need read the information of driver's electronic tag, enter step 3;
Step 3, car plate electronic tag enter accepting state, driver's electronic labeling information that reception is corresponding, and the time that continues to receive needs to receive once with assurance greater than the emission duration of driver's electronic tag; After the car plate electronic tag is received corresponding driver's electronic tag, the own clock that wakes up is carried out primary calibration, make the clock synchronization of waking up of itself and driver's electronic tag; Car plate electronic tag synchronously is when receive driver's electronic tag next time, and the start time of reception just is the transmitting time of driver's electronic tag, receives used time shortening, has saved power consumption; The vehicle electric label is received record driver electronic tag data behind driver's electronic tag, and the registration of vehicle state is cruising, enters step 7; If in continuing time of reception, do not receive driver's electronic labeling information, enter step 4;
Step 4, count not reading driver's electronic labeling information, if never receive driver's electronic tag in the predetermined timing wake-up times, then the registration of vehicle state is for repeatedly illegal; After finishing, record enters step 7;
If step 5 car plate electronic tag does not repeatedly detect driver's electronic tag, be to save power consumption, sets long cycle, reach and enter step 6 processing on the cycle count in limited time; Otherwise do not receive driver's label, directly enter step 7;
Step 6, car plate electronic tag enter accepting state, driver's electronic labeling information that reception is corresponding, and the time that continues to receive needs to receive once with assurance greater than the emission duration of driver's electronic tag; After the car plate electronic tag is received corresponding driver's electronic tag, the own clock that wakes up is carried out primary calibration, make the clock synchronization of waking up of itself and driver's electronic tag; Car plate electronic tag synchronously is when receive driver's electronic tag next time, and the start time of reception just is the transmitting time of driver's electronic tag; The car plate electronic tag is received record driver electronic tag data behind driver's electronic tag, and the registration of vehicle state is cruising, enters step 7; If do not receive driver's electronic labeling information in continuing time of reception, it is to enter step 7 after the illegal state that vehicle-state is set;
Step 7, car plate electronic tag send the data that have identification of the vehicle and status information to read write line, if vehicle is a cruising, then send the identifier that data can also comprise the driver; The transmission laggard accepting state of going into that finishes is waited for the further communication request of read write line, and the stand-by period operated by rotary motion is shorter; Read write line further communicates with the car plate electronic tag if desired, sends immediately after receiving data and continues communication request; If the car plate electronic tag is received the continuation communication request, then handle solicited message, and give the read write line answer; If communication finishes, the car plate electronic tag enters dormant state.
3. the electronic vehicle license plate system based on active radio-frequency (RF) identification comprises radio-frequency identification reader/writer, car plate electronic tag and driver's electronic tag; It is characterized in that described radio-frequency identification reader/writer comprises microcontroller, Transmit Receive Unit, interface circuit, power circuit and antenna; Described car plate electronic tag comprises the low-power consumption microcontroller, wakes clock up, motion sensor, Transmit Receive Unit, antenna and electric power management circuit; Described driver's electronic tag comprises the low-power consumption microcontroller, wakes clock up, Transmit Receive Unit, antenna and battery.
4. electronic vehicle license plate system according to claim 3 is characterized in that, described car plate electronic tag is connected with the P1.6 pin with the clock pin P1.7 pin corresponding with microcontroller chip that wake up that driver's electronic tag adopts; The Transmit Receive Unit of described read write line, car plate electronic tag and driver's electronic tag is connected with microcontroller by synchronous communication serial ports SPI; The motion sensor of described car plate electronic tag is connected with an I/O interface of microcontroller; Described car plate electronic tag and driver's electronic tag all adopt powered battery.
5. electronic vehicle license plate system according to claim 3 is characterized in that, the microcontroller that described car plate electronic tag and driver's electronic tag adopt is the C8051F982 chip.
6. electronic vehicle license plate system according to claim 3 is characterized in that, what described Transmit Receive Unit adopted is 2.4GHz radio transmitting and receiving chip nRF24L01 chip.
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| CN 201110224617 CN102289693B (en) | 2011-08-05 | 2011-08-05 | Electronic license plate system based on active radio frequency recognition and communication control method thereof |
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| CN 201110224617 CN102289693B (en) | 2011-08-05 | 2011-08-05 | Electronic license plate system based on active radio frequency recognition and communication control method thereof |
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| CN103853999A (en) * | 2012-11-30 | 2014-06-11 | 章玺 | Method for controlling RFID electronic tag through sensor |
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| EP3565745A4 (en) * | 2017-01-05 | 2020-12-30 | Revivermx, Inc. | Power and communication modes for digital license plate |
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| EP3565741A4 (en) * | 2017-01-05 | 2020-06-17 | Revivermx, Inc. | Thermal control system for a digital license plate |
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