CN102568232B - System for prewarning vehicle speed on bent roads based on radio frequency identification (RFID) - Google Patents
System for prewarning vehicle speed on bent roads based on radio frequency identification (RFID) Download PDFInfo
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- CN102568232B CN102568232B CN201210013851.0A CN201210013851A CN102568232B CN 102568232 B CN102568232 B CN 102568232B CN 201210013851 A CN201210013851 A CN 201210013851A CN 102568232 B CN102568232 B CN 102568232B
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- rfid
- bend
- control chip
- vehicle speed
- threshold value
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Abstract
The invention discloses a system for prewarning vehicle speed on bent roads based on radio frequency identification (RFID). The system comprises a vehicle-mounted unit and a roadbed unit, wherein the vehicle-mounted unit comprises a controller area network (CAN) bus, a digital tube, a buzzer, a control chip and an RFID reader; the roadbed unit comprises an RFID tag for storing bent road data information and a CAN bus access control chip; the control chip is connected with the digital tube and the buzzer; and the RFID reader is in bidirectional connection with the control chip, and communicates with the RFID tag. The system can read the corner information stored in the RFID tag before a vehicle enters a bent road and prewarn a driver if a potential safety hazard exists, so that the accident incidence rate can be reduced remarkably; and the system is particularly suitable for urban multi-section continuous bent roads, highspeed roads and the like.
Description
Technical field
The present invention relates to intelligent transportation field, particularly a kind of bend vehicle speed prewarning system based on RFID.
Background technology
The too high meeting of automobile speed of a motor vehicle when entering bend causes breaks away or rollover, with regard to bend vehicle speed prewarning mechanism, launched research both at home and abroad, current main solution is to rely on GPS and high-precision electronic chart, as safety early warning for track curve and the driving recording method of the patent No. navigational system that is 200410081844.X can give warning in advance in conjunction with electronic chart before entering bend, but easily influenced in many bends area gps signal validity such as bridge, buildings are intensive, also need be with the road conditions high-precision electronic chart that upgrades in time; The patent No. is 200910158546.9 dynamic detection method for preventing wagon from turning towards one side on bending road and prior-warning device, can only be after vehicle enters bend completely perception track degree of tilt, vehicle side acceleration etc., cannot give warning in advance; Need to install additional compared with multisensor simultaneously, be unfavorable for cost control.
Summary of the invention
Technical matters to be solved by this invention is, not enough for prior art, and a kind of bend vehicle speed prewarning system based on RFID is provided, and for automobile provides early warning during the higher speed of a motor vehicle on crankcase ventilaton, prevents to break away and the traffic hazard such as rollover.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of bend vehicle speed prewarning system based on RFID, comprise board units and roadbed unit, board units comprises CAN bus, charactron, hummer, control chip, RFID reader, roadbed unit comprises the RFID label that stores bend data message, CAN bus Access Control chip, control chip is connected with charactron, hummer, RFID reader is connected with control chip is two-way, RFID reader and RFID label communication.
Control chip can be the various microprocessors such as single-chip microcomputer, ARM, DSP.
Described charactron is LED charactron.
Bend vehicle speed prewarning system of the present invention can be before vehicle enters bend, read the bend information being stored in road RFID label, if exist potential safety hazard to report to the police in advance, can obviously reduce accident rate, be especially applicable to city multistage continuous bend road and highway etc.
Accompanying drawing explanation
Fig. 1 is the bend vehicle speed prewarning system architecture diagram of one embodiment of the invention based on RFID;
Fig. 2 is the method flow diagram that one embodiment of the invention bend vehicle speed prewarning system is carried out bend early warning;
Fig. 3 is one embodiment of the invention STC89C52 singlechip control chip circuit theory diagrams.
Embodiment
As shown in Figure 1, one embodiment of the invention comprises board units and roadbed unit, board units comprises CAN bus, charactron, hummer, control chip, RFID reader, roadbed unit comprises the RFID label that stores bend data message, CAN bus Access Control chip, control chip is connected with charactron, hummer, and RFID reader is connected with control chip is two-way, RFID reader and RFID label communication.
Board units is controlled RFID reader by RS232 serial ports or SPI interface etc., makes it send the electromagnetic wave of reading RFID label, and the RFID label in roadbed unit starts and sends built-in curve ahead data to RFID reader after receiving electromagnetic wave.Obtain after curve ahead data, control chip is according to the quasistatic rollover principle of the tire adhesion coefficient of road ahead and rigidity automobile, and detects rain brush switching signal, calls the tire adhesion coefficient of the recommendation under different weather.Safe speed threshold value V in the time of can calculating defective steering stabilizer by bend parameters such as tire adhesion coefficient and bend curvature, superelevation amounts
s, and this velocity amplitude is presented in LED digital lamp tube.When the speed of a motor vehicle on monitoring CAN bus is greater than safe speed threshold value, according to current vehicle speed V and from bend entrance apart from etc. information exchange cross hummer and carry out grading forewarning system.Grading forewarning system judges according to entering the required car deceleration degree value of bend, when required deceleration value a is less than comfortable retarded velocity threshold value (as 2.5m/s
2) time start general early warning; Be greater than comfortable retarded velocity threshold value (as 2.5m/s
2) time, start urgent early warning.
In roadbed unit, in RFID label, inclusion information has: the distance D of current RFID label and curve ahead porch, bend superelevation amount
bend maximum curvature ρ, tire adhesion coefficient μ under normal weather
1, tire adhesion coefficient μ under rainy weather
2deng.
Curved road safety speed of a motor vehicle threshold value
wherein tire recommendation attachment coefficient μ is μ
1or μ
2.When rain brush not detected opening signal in CAN bus, tire recommends attachment coefficient to adopt μ
1; Otherwise adopt μ
2, g is acceleration of gravity.
Brake required retarded velocity
wherein V is the vehicle current vehicle speed that comes from CAN bus, and Vs is safe speed threshold value, and t is the front reaction time for driver brakes, and generally gets 0.75～1 second.
General span: g gets 9.8m/s
2; The distance D span of label and curve ahead porch is 100～200m; Highway bend maximum curvature ρ span is 0.0005/m～0.00272/m; Under normal weather, tire is recommended attachment coefficient μ
1be 0.75～0.9, under rainy weather, tire is recommended attachment coefficient μ
2be 0.5～0.7, comfortable retarded velocity is generally got 1.5m/s
2～2.5m/s
2.
One embodiment of the invention bend vehicle speed prewarning system is carried out the method flow diagram of bend early warning and is seen Fig. 2.
In the present embodiment, control chip adopts STC89C52 single-chip microcomputer, and its circuit theory diagrams are shown in Fig. 3.
Claims (3)
1. the bend vehicle speed prewarning system based on RFID, comprises board units and roadbed unit, it is characterized in that, board units comprises CAN bus for transmitting vehicle present speed, the safe speed threshold value when showing defective steering stabilizer
charactron, hummer, the safe speed threshold value when calculating defective steering stabilizer
and control control chip, the RFID reader of hummer grading forewarning system, roadbed unit comprises the RFID label that stores bend data message, CAN bus Access Control chip, control chip is connected with charactron, hummer, RFID reader is connected with control chip is two-way, RFID reader and RFID label communication; Described bend data message comprises the distance D of current RFID label and curve ahead porch, bend superelevation amount
, bend maximum curvature
, tire adhesion coefficient under normal weather
, tire adhesion coefficient under rainy weather
; Described safe speed threshold value
, when rain brush not detected opening signal in CAN bus,
get
; Otherwise
get
;
for acceleration of gravity; The car deceleration degree value required according to bend judges described grading forewarning system: when the required deceleration value of braking
while being less than comfortable retarded velocity threshold value, start general early warning; When the required deceleration value of braking
while being greater than comfortable retarded velocity threshold value, start urgent early warning; Wherein brake required deceleration value
, wherein t for driver brakes the front reaction time, t span is 0.75～1 second.
2. the bend vehicle speed prewarning system based on RFID according to claim 1, is characterized in that, described control chip is STC89C52 single-chip microcomputer.
3. the bend vehicle speed prewarning system based on RFID according to claim 1, is characterized in that, described charactron is LED charactron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210013851.0A CN102568232B (en) | 2012-01-17 | 2012-01-17 | System for prewarning vehicle speed on bent roads based on radio frequency identification (RFID) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210013851.0A CN102568232B (en) | 2012-01-17 | 2012-01-17 | System for prewarning vehicle speed on bent roads based on radio frequency identification (RFID) |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102568232A CN102568232A (en) | 2012-07-11 |
| CN102568232B true CN102568232B (en) | 2014-08-13 |
Family
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|---|---|---|---|
| CN201210013851.0A Expired - Fee Related CN102568232B (en) | 2012-01-17 | 2012-01-17 | System for prewarning vehicle speed on bent roads based on radio frequency identification (RFID) |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104200693A (en) * | 2014-09-19 | 2014-12-10 | 贵州大学 | Anti-rollover method and anti-rollover device based on road-vehicle coordination |
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|---|---|---|---|---|
| CN103413460B (en) * | 2013-07-17 | 2016-01-20 | 北京航空航天大学 | A kind of curve traffic method for early warning collaborative based on bus or train route |
| CN103707807A (en) * | 2013-12-17 | 2014-04-09 | 江苏大学 | Collision pre-warning system for deceleration strip |
| CN104835338B (en) * | 2014-08-18 | 2017-08-29 | 上海济安交通工程咨询有限公司 | The preposition caution system of traffic administration signal based on mobile unit |
| CN105869420A (en) * | 2016-05-16 | 2016-08-17 | 同济大学 | Road optical illusion forced deceleration system and method for vehicle access joint |
| CN109887306A (en) * | 2019-03-15 | 2019-06-14 | 南京工程学院 | Traffic intersection control early warning system and control method based on RFID technique |
| CN112550371A (en) * | 2020-11-25 | 2021-03-26 | 矿冶科技集团有限公司 | Underground obstacle detection method, system and control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1557658A (en) * | 2004-01-13 | 2004-12-29 | 陈向明 | Motor vehicle positioning guidance system using RFID technology |
| CN2924487Y (en) * | 2005-04-28 | 2007-07-18 | 陈向明 | Motorvehicle positioning navigation device utilizing RFID technology |
| CN101612927A (en) * | 2008-09-04 | 2009-12-30 | 清华大学 | Dynamic detection method for preventing wagon from turning towards one side on bending road and prior-warning device |
| CN202075300U (en) * | 2011-04-12 | 2011-12-14 | 南京第五十五所技术开发有限公司 | RFID (radiofrequency identification) underground vehicle speed measurement system |
| CN202486996U (en) * | 2012-01-17 | 2012-10-10 | 湖南大学 | Curve speed early warning system based on RFID |
-
2012
- 2012-01-17 CN CN201210013851.0A patent/CN102568232B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1557658A (en) * | 2004-01-13 | 2004-12-29 | 陈向明 | Motor vehicle positioning guidance system using RFID technology |
| CN2924487Y (en) * | 2005-04-28 | 2007-07-18 | 陈向明 | Motorvehicle positioning navigation device utilizing RFID technology |
| CN101612927A (en) * | 2008-09-04 | 2009-12-30 | 清华大学 | Dynamic detection method for preventing wagon from turning towards one side on bending road and prior-warning device |
| CN202075300U (en) * | 2011-04-12 | 2011-12-14 | 南京第五十五所技术开发有限公司 | RFID (radiofrequency identification) underground vehicle speed measurement system |
| CN202486996U (en) * | 2012-01-17 | 2012-10-10 | 湖南大学 | Curve speed early warning system based on RFID |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104200693A (en) * | 2014-09-19 | 2014-12-10 | 贵州大学 | Anti-rollover method and anti-rollover device based on road-vehicle coordination |
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|---|---|
| CN102568232A (en) | 2012-07-11 |
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