CN101783081B - Highway rear-end collision prevention early warning system - Google Patents
Highway rear-end collision prevention early warning system Download PDFInfo
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- CN101783081B CN101783081B CN2009100605624A CN200910060562A CN101783081B CN 101783081 B CN101783081 B CN 101783081B CN 2009100605624 A CN2009100605624 A CN 2009100605624A CN 200910060562 A CN200910060562 A CN 200910060562A CN 101783081 B CN101783081 B CN 101783081B
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Abstract
The invention discloses a highway rear-end collision prevention early warning system which relates to the technical field of traffic safety facilities. The highway rear-end collision prevention early warning system comprises control terminals (K) which are arranged at an entrance and an exit; monitoring subnetworks are arranged at N monitoring points of a highway full-range two-way lane, and the long-distance wireless communication between each monitoring subnetwork and the control terminal (K) is realized through a GSM/GPRS (Global System for Mobile Communications/General Packet Radio Service) wireless communication module (W); and each monitoring subnetwork mainly comprises a plurality of ultrasonic probes, a multi-machine communication interface circuit and an acousto-optic warning board (P). The invention has low expense and convenient construction, can accurately and reliably monitor and compute the vehicle speed, the lane and the front-and-rear vehicle distance of driving vehicles, can adjust the early warning threshold values of the safe vehicle interval and the vehicle speed according to the change of visibility, can early warn rear-end collision, overspeed, low speed, traffic jams of a forward road and the like, improves the smoothness ratio of the road, ensures the driving safety and is suitable for highway rear-end collision prevention early warning.
Description
Technical field
The present invention relates to the traffic safety facilities technical field, relate in particular to a kind of highway rear-end collision prevention early warning system.
Background technology
Along with the fast development of highway, sharply the increasing of car owning amount, the driving accident of highway is frequent further, especially in violation of rules and regulations driving and dense fog, sleety weather caused knocks into the back and even a chain of accident that knocks into the back is appeared in the newspapers repeatly.For this reason; Industry has proposed the different solution of many characteristics to the monitoring problem of express way driving safety; But conclude, be broadly divided into two types, i.e. vehicular early warning scheme and drive test formula early warning scheme: vehicular early warning scheme mainly relies on vehicle-mounted microwave radar or infrared laser ranging technology to monitor two spacings; If two car spacings are less than safe distance, data processing module will send deceleration instruction; Thereby realize the purpose of the anti-early warning of knocking into the back.Like Daimler-Kreisler Corp, Volvo AB etc. have successively released the automobile anti-collision device of research and development separately in the world, and the subject matter that this type automobile anti-collision device exists is to cost an arm and a leg, and some relevant technical bottlenecks are also arranged certainly; Like reliability, the identification of bend road conditions barrier of signal Processing under the strong background noise condition and the operation mistake police etc. that prevents to overtake other vehicles.The research of domestic vehicular automatic collision technical elements; Mainly concentrating on full-sized car enterprises such as Changchun one vapour, Dongfeng Automobile, Science Institute of Ministry of Communications and Tsing-Hua University and scientific research institutions carries out; But just the research of exploration does not still have operable product.And drive test early warning scheme rests on basically and writes spacing and keep warning sign and the monitoring of equipment speed of a motor vehicle such as velocity radar, gamma camera are installed above road, does not also have to appear on the market to the anti-institution of being hot on the trail of of automobile specially.But in recent years, the research of drive test early warning pattern begins to receive the concern of industry, warp retrieval discovery; Find through retrieval; Application number is 02113003.5; The applying date is that the Chinese patent of 2002.05.14 discloses " a kind of early warning system and method for early warning thereof that prevents that highway from knocking into the back and colliding ", and this system comprises central processing unit CP and the detection line DL that is made up of microwave detector, terminal, road and alarm indicator; Detection line DL is installed in the inboard of express highway all-way two-way lane equally spacedly and is connected with central processing unit CP through data transmission link LI; Each detection line is connected with its front and back detection line respectively, and the terminal, road among the detection line DL is connected with alarm indicator with microwave detector respectively.This method for early warning is; The vehicle that the microwave detector perception is passed through, transport information is handled and sent in the terminal, road to the signal of microwave detector acceptance and the information of detection line transmission.The subject matter that this early warning scheme exists is;
1) if the microwave detector that this scheme adopts can measuring vehicle apart from the distance in roadside (roadside apart from), mean that this detector is the small microwave radar, if equip this detector completely, cost of investment is too big, is difficult to put into engineering construction.If this detector does not have the function of measuring the roadside distance, mean the reliably track at identification traffick place of this scheme, its direct result will cause being difficult to resolution and overtake other vehicles and be hot on the trail of.
2) this scheme is provided with microwave detector for 100 meters in two-way interval completely at highway; The vehicle that perception is passed through; And combine between each detection line information communication (being the information code character that each detection line receives two in the place ahead and the detection line in rear), slightly declare before and after approximate location and the relative distance of vehicle whether at 100 meters; Within 200 meters or 300 meters, thereby whether decision sends the anti-early warning signal that knocks into the back.Obvious, the relative distance of two cars before and after this scheme can't accurately be monitored, the anti-void that knocks into the back, the alert probability of mistake will cause this scheme not possess operability.
Another application for a patent for invention that application number is 03113328.2, the applying date is 2003.4.29 discloses another drive test early warning scheme; I.e. " instant method for early warning of expressway safety and system ".This system utilizes public telephone network to form early warning net; Owing to adopt monitoring devices such as manual signal switch alternative sensor; Can't realize monitoring and early warning to vehicle rear-end collision; So this system points out follow-up vehicle to prevent continuously and knocks into the back, thereby but can't stop rear-end collision in the generation of early warning rear-end collision in advance after only being suitable for the accident generation.
Summary of the invention
The object of the invention just is to overcome the shortcoming and defect that prior art exists, and a kind of highway rear-end collision prevention early warning system is provided.
The objective of the invention is to realize like this:
To the problems referred to above, the present invention utilizes ultrasound detection, microprocessor and the information processing technology, RS-485 bus, correlation techniques such as near, remote radio communication.
Technical scheme provided by the invention is:
The two-way Four-Lane Road of standard (two-way traffic >=7.5 meter) is the main pattern that the highway track is arranged, highway rear-end collision prevention early warning system of the present invention is particularly suited for the monitoring of two-way Four-Lane Road and arranges.
According to landform, physical features, wagon flow message and the long-term frost mist of institute's monitoring highway, the meteorological data of sleet etc., arrange N (comprising whole process) monitoring point at the two-way Four-Lane Road of highway.
Two-way Four-Lane Road monitoring subnet comprises the control terminal that is arranged in the place, entry and exit, and control terminal is made up of terminal computer and the visiometer that is connected with terminal computer respectively, GSM/GPRS remote communication module and monitoring display screen;
N monitoring point at the express highway all-way two-way lane is provided with the monitoring subnet, realizes remote radio communication through the 6SM/GPRS wireless communication module between monitoring subnet and control terminal;
The monitoring subnet master is made up of a plurality of ultrasonic probes, multi-computer communication interface circuit and acousto-optic warning sign P;
Ultrasonic probe comprises first, second, third and fourth ultrasonic probe that structure is identical;
It is inboard that first ultrasonic probe and second ultrasonic probe are arranged in motor-driven vehicle going direction lane the right, in order to monitoring second lane driving vehicle;
It is inboard that the 3rd ultrasonic probe and the 4th ultrasonic probe are arranged in the two-way motor-driven vehicle going direction lane left side, median strip, road, in order to monitoring first lane driving vehicle;
The acousto-optic warning board is arranged in first and second the place ahead, ultrasonic probe homonymy roadside; Through monitoring calculation to track, the speed of a motor vehicle, front-and-rear vehicle distance and the vehicle flowrate of driving vehicle; Early warning is in time knocked into the back, is exceeded the speed limit, the traffic jam of the speed that stagnates and road ahead etc., and reminds the driver to drive with caution with the sound and light alarm mode.
The present invention has advantage and good effect:
1. cheap, the easy construction of this system cost;
2. can be accurately, the speed of a motor vehicle, track, and the front-and-rear vehicle distance of monitoring calculation driving vehicle reliably; And can be according to the variation of visibility; The threshold value of warning of the adjustment safe distance between vehicles and the speed of a motor vehicle; Early warning is knocked into the back, the traffic jam of hypervelocity, low speed and road ahead etc., thus in time with the sound and light alarm mode remind the driver to drive with caution to stop highway knocks into the back and a chain ofly knock into the back, the generation of accidents such as hypervelocity, low speed and illegal parking;
3. the rate that improves that the road is clear is guaranteed traffic safety.
4. be applicable to the anti-early warning of knocking into the back of highway.
Description of drawings
Fig. 1 is the arrangenent diagram of the unidirectional monitoring subnet in the two-way Four-Lane Road;
Fig. 2 is the circuit structure block scheme of two-way Four-Lane Road monitoring subnet;
Fig. 3 is the ultrasonic probe circuit theory diagrams;
Fig. 4 is acousto-optic warning board circuit theory diagrams;
Fig. 5 is the arrangenent diagram of the shared monitoring subnet of two-way Four-Lane Road;
Fig. 6 is the arrangenent diagram of two-way eight tracks monitoring subnet;
Fig. 7 is two-way eight tracks shared monitoring subnet circuit block diagram.
Wherein:
1,2 ... 16-first and second ... 16 ultrasonic probes;
P-acousto-optic warning board;
The W-GSM/GPRS wireless communication module;
The K-control terminal.
English to Chinese:
GSM-Global System for Mobile Communications, global system for mobile communications;
GPRS-General Packet Radio Service, GPRS;
CAN-Controller Area Network, controller local area network is one of most widely used fieldbus in the world.
Embodiment
Specify below in conjunction with accompanying drawing and embodiment:
One, embodiment one, two-way Four-Lane Road monitoring subnet
1, overall
The two-way Four-Lane Road of standard (two-way traffic >=7.5 meter) is the main pattern that the highway track is arranged, highway rear-end collision prevention early warning system of the present invention is particularly suited for the monitoring of two-way Four-Lane Road and arranges.
According to landform, physical features, wagon flow message and the long-term frost mist of institute's monitoring highway, the meteorological data of sleet etc., arrange N (comprising whole process) monitoring point at the two-way Four-Lane Road of highway.
Like Fig. 1,2, two-way Four-Lane Road monitoring subnet comprises the control terminal K that is arranged in the place, entry and exit, and control terminal K is made up of terminal computer and the visiometer that is connected with terminal computer respectively, GSM/GPRS remote communication module and monitoring display screen;
N monitoring point at the express highway all-way two-way lane is provided with the monitoring subnet, realizes remote radio communication through GSM/GPRS wireless communication module W between monitoring subnet and control terminal K;
The monitoring subnet master is made up of a plurality of ultrasonic probes, multi-computer communication interface circuit and acousto-optic warning sign P; Ultrasonic probe comprises first, second, third and fourth ultrasonic probe 1,2,3,4 that structure is identical;
It is inboard that first ultrasonic probe 1 and second ultrasonic probe 2 are arranged in motor-driven vehicle going direction lane the right, in order to monitoring second lane driving vehicle;
It is inboard that the 3rd ultrasonic probe 3 and the 4th ultrasonic probe 4 are arranged in the two-way motor-driven vehicle going direction lane left side, median strip, road, in order to monitoring first lane driving vehicle;
Acousto-optic warning board P is arranged in first and second the place ahead, ultrasonic probe 1,2 homonymy roadside; Through monitoring calculation to track, the speed of a motor vehicle, front-and-rear vehicle distance and the vehicle flowrate of driving vehicle; Early warning is in time knocked into the back, is exceeded the speed limit, the traffic jam of the speed that stagnates and road ahead etc., and reminds the driver to drive with caution with the sound and light alarm mode.
2, functional block
1) ultrasonic probe
Like Fig. 2,3, each ultrasonic probe mainly comprises ultrasonic transducer 1A, signal conditioning circuit 1B, from microprocessor 1C and serial communication level shifting circuit 1D;
The master microprocessor PA from microprocessor 1C and acousto-optic warning board P of first and second ultrasonic probe 1,2 connects into principal and subordinate's multi-computer communication circuit by the RS-485 interface;
Connecting of third and fourth ultrasonic probe 3,4 from employing rs-232 standard between microprocessor 1C;
The second, four ultrasonic probes 2,4 realizes short-range wireless communication from employing short-range wireless communication module J between microprocessor 1C;
1C selects AT89C52 from microprocessor;
Serial communication level shifting circuit 1D selects MAX232 or MAX485 for use.
In addition, ultrasonic probe or select laser detector for use, or select infrared eye for use, or select for use doppler detector to substitute, all be arranged on the both sides, track; Ultrasonic probe or select magnetic coil circlewise for use, it is underground to be arranged on the track.
2) acousto-optic warning board P
Acousto-optic warning board P is made up of preceding latter linked master microprocessor PA and acousto-optic warning circuit PB;
The serial ports 1 of master microprocessor PA is connected through embedded MAX232 with GSM/GPRS wireless communication module W, realizes the wireless transmission function of remote alarms information;
Acousto-optic warning circuit PB is made up of series-multiple connection shift register chip PB1, Darlington transistor array chip PB2, decoder chip PB3, speech chip PB4, audio frequency power amplifier chip PB5, display screen PB6 and loudspeaker PB7;
Be connected successively before and after master microprocessor PA, series-multiple connection shift register chip PB1, Darlington transistor array chip PB2 and the display screen PB6, realize that the row of display screen PB6 drive function;
Be connected successively before and after master microprocessor PA, decoder chip PB3 and the display screen PB6, realize that the line scanning of display screen PB6 drives function;
Be connected successively before and after master microprocessor PA, speech chip PB4, audio frequency power amplifier chip PB5 and the loudspeaker PB7, realize high-power audio alert function.
3, the course of work
When front truck passes through first ultrasonic probe 1; Start the timer 1 of first ultrasonic probe, 1 microprocessor 1C; (roadside distance) information of simultaneously echo being counted, found range is sent to second ultrasonic probe 2; And start the timer 1 of second ultrasonic probe, 2 microprocessor 1C, when front truck during through second ultrasonic probe 2, with the echo of being surveyed count, the roadside relatively reviews (track and the vehicle characteristics of affirmation driving vehicle are debated knowledge) apart from the relevant information that the information and first ultrasonic probe 1 obtain.Simultaneously, close second ultrasonic probe, 2 microprocessor 1C timers 1, timer 1 time value of surveying through second ultrasonic probe 2, can calculate the speed of this car.When the back car passes through first ultrasonic probe 1; Close the timer 1 of first ultrasonic probe, 1 microprocessor 1C; And the front and back car is sent to the microprocessor 1C of second ultrasonic probe 2 through the time value of first ultrasonic probe 1; Because first and second ultrasonic probe 1,2 distances are definite value, in conjunction with front and back car measuring and calculating speed separately, the relative vehicle headway when car is through the zone, monitoring point before and after can accurately calculating.And the measurement through the roadside distance judge before and after vehicle whether go in same track; If the spacing of vehicle is less than the safe distance between vehicles threshold value before and after the same track; And before back vehicle speed is not less than during vehicle speed; Acousto-optic warning board P car backward sends the anti-deceleration acousto-optic warning that knocks into the back, and the information behind the decelerating vehicles car of treating of announcement.
The traffick of the two-way motor-driven vehicle going direction of third and fourth ultrasonic probe 3,4 monitoring highways express lane, the ultrasonic probe monitoring method is the same.Spacing is less than the safe distance between vehicles threshold value before and after on the fast traffic lane; And before back vehicle speed is not less than during vehicle speed; The 4th ultrasonic probe 4 sends early warning information and data through CC1100 short-range wireless communication module J to second ultrasonic probe 2, and acousto-optic warning board P sends the anti-deceleration acousto-optic warning that knocks into the back to the back car of fast traffic lane immediately.Implement when overtaking other vehicles operation when the fast traffic lane driving vehicle steps on the juice, second, four ultrasonic probes 2,4 are debated cooperation and are known the car attitude of overtaking other vehicles or knock into the back.
In like manner; In different visibility environment; Ultrasonic probe also can be according to the vehicle flowrate identification of the adjacent monitoring point with relevant unit's time of different security speed of a motor vehicle threshold value, and whether the monitoring driving vehicle exceeds the speed limit, stagnates fast or stop, and in real time by the early warning of warning sign acousto-optic hint.
4, the shared monitoring subnet of two-way Four-Lane Road
Like Fig. 5, to the bidirectional test subnet in same highway section, ultrasonic probe comprises first and second that structure is identical ... Eight ultrasonic probes 1,2 ... 8;
Five, six, seven, eight ultrasonic probes 5,6,7,8 and first, second, third and fourth ultrasonic probe 1,2,3,4 are symmetrical set;
A GSM/GPRS wireless communication module W is set in the median strip, substitutes two GSM/GPRS wireless communication module W that are connected with first and second acousto- optic warning board 9,10 respectively, then be built into a kind of two-way two lane highways common type monitoring subnet;
The 4th ultrasonic probe 4 is connected with GSM/GPRS wireless communication module W respectively with the 8th ultrasonic probe 8.
Because GSM/GPRS wireless communication module W price is more expensive, the monitoring subnet ratio of performance to price is greatly improved.
Two, embodiment two, two-way eight tracks monitoring subnet
For the highway (like two-way eight tracks, ten two lane highways etc.) of two-way multilane, can change the ultrasonic probe installation site and accomplish monitoring according to basic facilities of the present invention and pattern.
With the two-way Four-Lane Road of standard (2 * 7.5 meters) highway is example, and practical implementation is following;
Like Fig. 6, between roadside, right side, track and median, set up the monitoring frame, the monitoring frame is a kind of rectangular parallelepiped, and is long * wide * high=8.2 * 1.2 * 6 meters; Laying ultrasonic probe at a distance of 1 meter position before and after each track center line of inner underside above the monitoring frame.
First and second ultrasonic probe 1,2 monitoring slow lanes; Third and fourth ultrasonic probe 3,4 monitorings the 3rd track; Five, six ultrasonic probes, 5,6 monitorings the 2nd track; Seven, eight ultrasonic probes, 7,8 monitoring fast traffic lanes, acousto-optic warning board are arranged in first and second the place ahead, ultrasonic probe 1,2 homonymy roadside apart from second ultrasonic probe, 2 about 5 meters to 20 meters.
Because ultrasonic probe is installed in each center line top, track, the requirement of track identification is able to desalination, and the major function of supersonic sounding is the vehicle body characteristic of checking driving vehicle.Because often vehicle flowrate is big for the highway of multilane, and is therefore, higher to data message stream transmission requirement in the monitoring point.Factor to sum up, first and second ultrasonic probe 1,2 of front and back that the present invention handles each track vehicle heading adopts parallel communications modes.The second, the serial ports 0 of the master microprocessor PA of the serial ports of four, six, eight ultrasonic probes 2,4,6,8 and acousto-optic warning board P connects into principal and subordinate's multi-computer communication circuit by the RS-485 interface; The serial ports 1 of the master microprocessor PA of acousto-optic warning board P links to each other with the 6SM/GPRS module and realizes telecommunication, and its monitoring and pre-alarming method and step such as embodiment are together.
In order to save construction cost and the hardware spending of 6SM/GPRS remote radio communication network of monitoring frame; The common type monitoring subnet that viaduct that bidirectional high speed highway also capable of using top is crossed over or railway bridge are arranged two-way lane; Parallel+RS-485 multimachine master-slave mode that its communication mode can adopt; Also can consider to adopt the CAN bus mode to accomplish monitoring according to stream data transmission and communication; As shown in Figure 7: each ultrasonic probe links to each other with the CAN controller through 232 interfaces, and the CAN controller connects into communication node with the CAN bus transceiver again, realizes the reception and the transmission task of data.Because the CAN bus is the work of many master modes, and adopt non-destruction bus arbitration technology.When a plurality of microprocessors simultaneously when conflict appears in bus sending information; The microprocessor that priority is lower can withdraw from transmission on one's own initiative; And the high data of priority can obtain transmission at most in 134 μ S; Thereby saved the bus collision arbitration time greatly, to guarantee the reliability of monitoring point internal data communication.
In order to save the quantity of detector (probe); The scheme characteristics that the identification of no track requires in the present embodiment capable of using, each track center line of inner underside substitutes the monitoring calculation task that two ultrasonic probes are realized the speed of a motor vehicle, front and back following distance with the doppler detector of a band microprocessor above the monitoring frame.
In addition, the front-and-rear vehicle distance measuring method of utilizing the present invention to propose, the ultrasonic probe that embodiment one and embodiment two are adopted as with infrared (laser) detector, magnetic coil etc. is alternative circlewise, all can reach the same anti-monitoring purpose that knocks into the back.
Claims (5)
1. two-way Four-Lane Road rear-end collision prevention early warning system of highway; Comprise the control terminal (K) that is arranged in the place, entry and exit, control terminal (K) is made up of terminal computer and the visiometer that is connected with terminal computer respectively, GSM/GPRS remote communication module and monitoring display screen;
It is characterized in that:
N monitoring point at the express highway all-way two-way lane is provided with the monitoring subnet, realizes remote radio communication through GSM/GPRS wireless communication module (W) between monitoring subnet and control terminal (K);
The monitoring subnet master is made up of a plurality of ultrasonic probes, multi-computer communication interface circuit and acousto-optic warning sign (P);
Ultrasonic probe comprises first, second, third and fourth identical ultrasonic probe of structure (1,2,3,4);
It is inboard that first ultrasonic probe (1) and second ultrasonic probe (2) are arranged in motor-driven vehicle going direction lane the right, in order to monitoring second lane driving vehicle;
It is inboard that the 3rd ultrasonic probe (3) and the 4th ultrasonic probe (4) are arranged in the two-way motor-driven vehicle going direction lane left side, median strip, road, in order to monitoring first lane driving vehicle;
Acousto-optic warning board (P) is arranged in first and second ultrasonic probe (1,2) the place ahead, homonymy roadside; Through monitoring calculation to track, the speed of a motor vehicle, front-and-rear vehicle distance and the vehicle flowrate of driving vehicle; Early warning is in time knocked into the back, is exceeded the speed limit, the traffic jam of the speed that stagnates and road ahead, and reminds the driver to drive with caution with the sound and light alarm mode;
GSM-ball GSM;
GPRS-GPRS.
2. by the two-way Four-Lane Road rear-end collision prevention early warning system of the described highway of claim 1, it is characterized in that:
Ultrasonic probe mainly comprises ultrasonic transducer (1A), signal conditioning circuit (1B) and from microprocessor (1C);
Signal conditioning circuit (1B) links to each other with I/O mouth from microprocessor (1C) with ultrasonic transducer (1A) respectively;
The master microprocessor (PA) from microprocessor (1C) and acousto-optic warning board (P) of first and second ultrasonic probe (1,2) connects into principal and subordinate's multi-computer communication circuit by the RS-485 interface;
Connecting of third and fourth ultrasonic probe (3,4) from employing rs-232 standard between microprocessor (1C); The second, four ultrasonic probes (2,4) realizes short-range wireless communication from employing short-range wireless communication module (J) between microprocessor (1C).
3. the two-way Four-Lane Road rear-end collision prevention early warning system of highway according to claim 1 is characterized in that:
Acousto-optic warning board (P) is made up of preceding latter linked master microprocessor (PA) and acousto-optic warning circuit (PB);
The serial ports 1 of master microprocessor (PA) is connected through embedded MAX232 with GSM/GPRS wireless communication module (W), realizes the wireless transmission function of remote alarms information;
Acousto-optic warning circuit (PB) is made up of series-multiple connection shift register chip (PB1), Darlington transistor array chip (PB2), decoder chip (PB3), speech chip (PB4), audio frequency power amplifier chip (PB5), display screen (PB6) and loudspeaker (PB7);
Be connected successively before and after master microprocessor (PA), series-multiple connection shift register chip (PB1), Darlington transistor array chip (PB2) and the display screen (PB6), realize that the row of display screen (PB6) drive function;
Be connected successively before and after master microprocessor (PA), decoder chip (PB3) and the display screen (PB6), realize that the line scanning of display screen (PB6) drives function;
Be connected successively before and after master microprocessor (PA), speech chip (PB4), audio frequency power amplifier chip (PB5) and the loudspeaker (PB7), realize high-power audio alert function.
4. the two-way Four-Lane Road rear-end collision prevention early warning system of highway according to claim 1 is characterized in that:
To the bidirectional test subnet in same highway section, ultrasonic probe comprises first and second that structure is identical ... Eight ultrasonic probes (1,2 ... 8);
Five, six, seven, eight ultrasonic probes (5,6,7,8) are symmetrical set with first, second, third and fourth ultrasonic probe (1,2,3,4);
A GSM/GPRS wireless communication module (W) then is set in the median strip, substitutes two GSM/GPRS wireless communication modules (W) that are connected with first and second acousto-optic warning board (9,10) respectively, then be built into a kind of two-way Four-Lane Road common type monitoring subnet;
The 4th ultrasonic probe (4) is connected with GSM/GPRS wireless communication module (W) respectively with the 8th ultrasonic probe (8).
5. the two-way Four-Lane Road rear-end collision prevention early warning system of highway according to claim 1 is characterized in that:
Ultrasonic probe or select laser detector for use, or select infrared eye for use, or select for use doppler detector to substitute.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100605624A CN101783081B (en) | 2009-01-16 | 2009-01-16 | Highway rear-end collision prevention early warning system |
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| CN2009100605624A CN101783081B (en) | 2009-01-16 | 2009-01-16 | Highway rear-end collision prevention early warning system |
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| CN109448435A (en) * | 2018-10-26 | 2019-03-08 | 浙江大华技术股份有限公司 | A kind of following distance detection method and device |
| CN110246348A (en) * | 2019-04-10 | 2019-09-17 | 中冶南方工程技术有限公司 | A kind of through street intelligent speed-limiting device |
| CN111932896B (en) * | 2020-09-14 | 2020-12-22 | 成都宜泊信息科技有限公司 | Vehicle congestion detection method and system for parking lot |
| US11430334B2 (en) * | 2020-10-21 | 2022-08-30 | Denso Corporation | Systems and methods for adaptable rear-end collision alerts |
| CN113529601A (en) * | 2021-06-09 | 2021-10-22 | 贵州正高科技有限公司 | Anti-blocking warning device for expressway traffic and anti-blocking method thereof |
| CN113628476B (en) * | 2021-06-24 | 2022-10-21 | 山东高速股份有限公司 | Method for preventing vehicles on highway from rear-end collision |
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| CN1379371A (en) * | 2002-01-25 | 2002-11-13 | 天津理工学院 | Intelligent digital scale system for preventing collision of cars on expressway |
| CN1381817A (en) * | 2002-05-14 | 2002-11-27 | 刘曙阳 | Prewarning system and method for prevening rear and collision on expressway |
| CN101206808A (en) * | 2007-12-17 | 2008-06-25 | 王新 | Method for preventing vehicles from front and rear vehicles from collision on motorway |
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