CN108694833A - Traffic abnormal incident detecting system based on binary sensor - Google Patents
Traffic abnormal incident detecting system based on binary sensor Download PDFInfo
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- CN108694833A CN108694833A CN201810784186.2A CN201810784186A CN108694833A CN 108694833 A CN108694833 A CN 108694833A CN 201810784186 A CN201810784186 A CN 201810784186A CN 108694833 A CN108694833 A CN 108694833A
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0108—Measuring and analyzing of parameters relative to traffic conditions based on the source of data
- G08G1/0116—Measuring and analyzing of parameters relative to traffic conditions based on the source of data from roadside infrastructure, e.g. beacons
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Abstract
The traffic abnormal incident detecting system based on binary sensor that the present invention relates to a kind of, belongs to traffic accident detection technique field, this method comprises the following steps:S1:Every three two-value detectors are constituted into one group of sensor, by multigroup sensor arrangement in the both sides in track, wherein every group of two two-value detectors are arranged in the side of road, remain the other side that next two-value detector is arranged into road;S2:Sensor hardware system and sensor network are built according to multigroup sensor;S3:The operation method of sensor hardware system is set;S4:It is required according to management and control center, data is submitted according to identity ID.It is small, easy to maintain that the obtained system of the design method has many advantages, such as that small, easy for installation, road pavement is destroyed.If installed and used on a large scale in real road, it will greatly improve the accuracy of highway accident detection.
Description
Technical field
The invention belongs to traffic accident detection technique fields, are related to a kind of traffic abnormal incident inspection based on binary sensor
Examining system.
Background technology
Traffic abnormal incident detection is that highway fortune pipe portion door carries out operation management and control, traffic information publication and traffic guidance
Basis, personal injury, property loss and avoid secondary traffic accident caused by reducing traffic accident etc. and have and is important
Effect.With the increase of the development and traffic information detection means of intelligent transport technology, using traffic information detection means into
Row anomalous event automatic identification has very important theoretical and reality for Improving Expressway management level and service level
Meaning.
Traffic information is the key that whether portraying and reflect traffic behavior normally, and it is then traffic abnormity thing to obtain traffic information
A link the most basic and important in part identification process.For the site environment that highway has a very wide distribution in this way, obtain
Take traffic information other than considering its intuitive factor, it is necessary to consider its price, many economic factors such as transmission cost.
Studies have shown that classical California algorithms (also known as California algorithm) are as the ginseng for assessing new traffic state judging algorithm performance
Algorithm is examined, condition discrimination principle is:The traffic state data compared between adjacent inspection stations differentiates traffic behavior, main traffic shape
State parameter is occupation rate.As can be seen that utilizing this traffic state data, highway can be realized by suitable algorithm
The detection of traffic abnormal incident.In order to improve the accuracy of detection, the required traffic state data of detection algorithm can also have
The magnitude of traffic flow, average speed etc., same classical MacMaster algorithms just need the support of multiple traffic state datas.In order to
Highway regulatory level is improved, more accurate intelligent transportation accident detection algorithm is all being studied by each state.It is thus right
More stringent requirements are proposed for the sensor of acquisition traffic information.Can obtain multiple traffic state datas, transmission method flexibly, valence
The cheap research direction as this sensor of lattice.
Invention content
In view of this, there is simple in structure, strong antijamming capability, cheap the purpose of the present invention is to provide a kind of
Traffic abnormal incident detecting system based on binary sensor.
In order to achieve the above objectives, the present invention provides the following technical solutions:
Traffic abnormal incident detecting system based on binary sensor, this method comprise the following steps:
S1:Every three two-value detectors are constituted into one group of sensor, by multigroup sensor arrangement in the both sides in track,
In every group of two two-value detectors be arranged in the side of road, remain the other side that next two-value detector is arranged into road;
S2:Sensor hardware system and sensor network are built according to multigroup sensor;
S3:The operation method of sensor hardware system is set;
S4:It is required according to administrative center, data is submitted according to identity ID.
Further, sensor hardware system includes microcontroller in step S2, and each detector is connected to the microcontroller,
And it is communicated by serial ports TTL or RS232, every group of sensor is provided with independent identity ID.
Further, sensor network includes multigroup sensor hardware system in step S2, and every group of sensing hardware system is logical
It crosses wireless-transmission network and is connected to management and control center.
Further, step S3 is specifically comprised the following steps:
S31:Initialization system is zeroed out operation to register, intermediate variable, timer, reads toggle switch numerical value,
The identity ID of baud rate in serial data transmission and management and control centre management software is set;
S32:According to the variation of the state of two-value detector level, and the location logic relationship of two-value detector is combined, obtained
Take traffic state data;
S33:Sensor hardware system carries out serial data transmission with management and control center.
Further, step S32 is specifically comprised the following steps:
S321:When vehicle passes through two-value detector, the state of two-value detector is recorded;
S322:The state of the two-value detector recorded and two-value detector current state are compared;
S323:If it is determined that the state for two-value detector changes with two-value detector current state, then start timing
Device;
If it is determined that not change, then the state of first two-value detector is become 1, and execute S327;
S324:Whether judgement timer overflows, if not overflowing, the current state of first two-value detector
1 is set, if timer overflows, variable T=maximum clocking values, and two-value detector current state sets 1;
S325:Judge second two-value detector state, if second two-value detector state is 1, second two-value
The current state of detector sets 1, and count value adds 1, if second two-value detector state is not 1, turns S326;
S326:Judge third two-value detector state, if third two-value detector state is 1, third two-value
The current state of detector sets 1, and count value P=P+1, if third two-value detector state is not 1, turns S327;
S327:Judge whether the state of three two-value detectors is 0 successively, if the state of any two-value detector is determined as
It is not 0, then is transferred to the state judgement of next two-value detector;
If the state of first two-value detector is 0, timer, and T=T+ clocking values, first two-value detection are closed
The current state of device is set to 0;
If the state of second two-value detector is 0, the current state of second two-value detector is set to 0;
If the state of third two-value detector is 0, the current state of third two-value detector is set to 0;
S328:Data are subjected to serial ports output, and circulation step S321.
Further, the step S33 is comprised the following steps:
S331:Serial data is read, and judges whether identity ID matches, is terminated if identity ID is mismatched,
S332 is executed if identity ID matchings;
S332:Whether decision instruction is flow, if so, serial ports sends three two-value detector current state values and counting
Value P, and S333 is executed, if it is not, then executing S333;
S333:Whether decision instruction is time occupancy, if so, serial ports sends variable T, and S334 is executed, if it is not, then
Execute S334;
S334:Three two-value detector current states, count value and variable T are set to 0;
S335:Terminate.
The beneficial effects of the present invention are:The present invention proposes a kind of design method of accident detection sensor.It should
Design method is based on two-value detector, has simple in structure, strong antijamming capability, lower-price characteristic.Two-value state recognition
Algorithm can provide a variety of traffic state datas, due to use standard serial port transmission data, can easily with market mainstream
Wireless communication module is coupled, and the setting of sensor self ID can make the topological structure of data wireless-transmission network more flexible more
Sample.It is small, easy to maintain that the design also has many advantages, such as that small, easy for installation, road pavement is destroyed.If big in real road
It installs and uses to scale, it will greatly improve the accuracy of highway accident detection.
Description of the drawings
In order to keep the purpose of the present invention, technical solution and advantageous effect clearer, the present invention provides following attached drawing and carries out
Explanation:
Fig. 1 is two-value detector fitting arrangement of the present invention;
Fig. 2 is overall structure of the present invention;
Fig. 3 is sensor hardware system circuit diagram of the embodiment of the present invention;
Fig. 4 is two-value detector state algorithm flow chart of the present invention;
Fig. 5 is serial data transfer process figure of the present invention.
Specific implementation mode
Below in conjunction with attached drawing, the preferred embodiment of the present invention is described in detail.
1, system overall architecture residing for sensor describes
By three two-value detectors test segment is equably laid in as the sensor that constitutes of detection device, detector I,
III is respectively at the both sides in unidirectional two track;Detector I and II is laid in the upper and lower spatial position of road homonymy, such as Fig. 1 institutes
Show.
Each sensor using serial ports (TTL or RS232) by by ISM band communication module (wireless serial server,
ZigBee, 433M etc.) wireless-transmission network and the management and control center PC that constitute constitute network connection, and oneself can be arranged in each sensor
Oneself ID, facilitates networking, management and control centre management software (including accident detection algorithm) can according to the ID of each sensor with
It exchanges data.Shown in overall architecture Fig. 2.
2, sensor hardware system
SCM uses AT89S52, it is a kind of low-power consumption, high-performance CMOS microcontroller, has 8K system programmables
Flash storage can meet design requirement completely.It provides two kinds of serial modes of TTL and RS232 to draw, using UM3221E realities
Show conversion of the Transistor-Transistor Logic level to standard RS232 level, to facilitate various wireless transport modules to plug into.Two-value detector passes through respectively
The P of AT89S520.0,P0.1,P0.2It is input to AT89S52, toggle switch SW1And SW2Pass through P respectively1.0~P1.7And P2.0~P2.7It is defeated
Enter and realizes the setting of sensor ID and the setting of serial port baud rate to AT89S52.Physical circuit is as shown in Figure 3.
3, sensing algorithm designs
3.1 system initialization
Initialization section mainly completes the structure of timer.Related register used in two-value state recognition algorithm,
The clear operation of intermediate variable, timer;Read toggle switch numerical value, the baud rate in setting serial data transmission and setting
Respond the identity ID etc. of management and control centre management software.
3.2 two-value state recognition algorithms
Two-value state recognition algorithm is the core of Sensor Design, it passes through the shape to three two-value detector level
The judgement of state, in conjunction with logical relations such as its positions, can effectively remove all kinds of obstacles (winged insect etc.), required for accurately obtaining
Traffic state data.Specific algorithm flow is as shown in Figure 4.
Wherein, P0.0~P0.2Represent the P of AT89S52 chips00~2 pin .P of port0.0It is connected to first two-value detection
Device, P0.1It is connected to second two-value detector, P0.2It is connected to third two-value detector.R0Indicate P0.0Current state;R1Indicate P0.1
Current state;R2Indicate P0.2Current state;P represents count value;T represents variable.
Two-value detector is sequentially placed along experiment road section length direction, for three two-value detectors.
Serial ports is initialized first.It changes when vehicle can trigger receiving-end state by two-value detector, makes P0.0By 0
Become 1, i.e., high level become from low level, then with current state R0It compares.If there is a change, then bootrom timer
Timing.If it is not, then first two-value detector state becomes 1.Then and so on, judge second and third two-value detector
State.Two-value detector is often triggered once, and count value P just increases once.When vehicle sails out of first two-value detector inspection
Survey range, P0.0Become 0 from 1, i.e., low level is become from high level, when at this moment closing chip timer, first two-value detection
Device state reverts to 0.Then the state of second and third two-value detector is judged successively.
3.3 serial datas transmit
Serial data transmission is mainly divided into two parts, and a part is to read director data, and instruction is sent by management and control centre punch one,
Two bytes, respectively represent:ID and which kind of traffic state data (only with two, latter six reserved);Another part is to send number
According to as long as the ID in the director data read is equal with the ID of oneself, the traffic state data specified is sent to management and control
Center.It is as shown in Figure 5 that serial data transmits program structure.
Judge to complete each time, a serial ports will be inquired, judges whether that data are submitted in requirement.If it is not, then continuing
Cycle criterion.Instruction is sent out it is desirable that flow or time occupancy data if so, just seeing.After data have been sent, hold
Row clear operation.
The present invention proposes a kind of design method of accident detection sensor.The design method is detected based on two-value
Device, two-value detector are proposed relative to general analog detector, reflect that the information at scene only has " whether there is or not " two states,
Without considering the problems of " size " (such as laser, other detection devices infrared, that take binary feature), therefore this detection
The sensor that device is constituted have simple in structure, strong antijamming capability, lower-price characteristic, be particularly suitable for highway this
The place that sample has a very wide distribution carries out traffic information detection.Two-value state recognition algorithm can provide a variety of traffic state datas,
Due to using standard serial port transmission data, can be easily coupled with the wireless communication module of market mainstream, sensor self ID
Setting the topological structure of data wireless-transmission network can be made more flexible various.The design also has small, installation side
Just, road pavement destroys the advantages that small, easy to maintain.If installed and used on a large scale in real road, it will greatly improve
The accuracy of highway accident detection.
Finally illustrate, preferred embodiment above is only to illustrate the technical solution of invention and unrestricted, although passing through
Above preferred embodiment is described in detail the present invention, however, those skilled in the art should understand that, can be in shape
Various changes are made in formula and to it in details, without departing from claims of the present invention limited range.
Claims (6)
1. the traffic abnormal incident detecting system based on binary sensor, it is characterised in that:The system comprises the following steps:
S1:Every three two-value detectors are constituted into one group of sensor, by multigroup sensor arrangement in the both sides in track, wherein often
Two two-value detectors of group are arranged in the side of road, remain the other side that next two-value detector is arranged into road;
S2:Sensor hardware system and sensor network are built according to multigroup sensor;
S3:The operation method of sensor hardware system is set;
S4:It is required according to management and control center, data is submitted according to identity ID.
2. the traffic abnormal incident detecting system according to claim 1 based on binary sensor, it is characterised in that:Step
Sensor hardware system includes microcontroller in S2, and each detector is connected to the microcontroller, and by serial ports TTL or
RS232 is communicated, and every group of sensor is provided with independent identity ID.
3. the traffic abnormal incident detecting system according to claim 2 based on binary sensor, it is characterised in that:Step
Sensor network includes multigroup sensor hardware system in S2, and every group of sensing hardware system is connected to by wireless-transmission network
Management and control center.
4. the traffic abnormal incident detecting system according to claim 3 based on binary sensor, it is characterised in that:Step
S3 is specifically comprised the following steps:
S31:Initialization system is zeroed out operation to register, intermediate variable, timer, reads toggle switch numerical value, setting
The identity ID of baud rate and management and control centre management software in serial data transmission;
S32:According to the variation of the state of two-value detector level, and the location logic relationship of two-value detector is combined, obtains and hand over
Logical state parameter;
S33:Sensor hardware system carries out serial data transmission with management and control center.
5. the traffic abnormal incident detecting system according to claim 4 based on binary sensor, it is characterised in that:Step
S32 is specifically comprised the following steps:
S321:When vehicle passes through two-value detector, the state of two-value detector is recorded;
S322:The state of the two-value detector recorded and two-value detector current state are compared;
S323:If it is determined that the state for two-value detector changes with two-value detector current state, then start timer;
If it is determined that not change, then the state of first two-value detector is become 1, and execute S327;
S324:Whether judgement timer overflows, if not overflowing, the current state of first two-value detector sets 1,
If timer overflows, variable T=maximum clocking values, and two-value detector current state sets 1;
S325:Judge second two-value detector state, if second two-value detector state is 1, second two-value detection
The current state of device sets 1, and count value adds 1, if second two-value detector state is not 1, turns S326;
S326:Judge third two-value detector state, if third two-value detector state is 1, the detection of third two-value
The current state of device sets 1, and count value P=P+1, if third two-value detector state is not 1, turns S327;
S327:Judge whether the state of three two-value detectors is 0 successively, if the state of any two-value detector be determined as be not
0, then it is transferred to the state judgement of next two-value detector;
If the state of first two-value detector is 0, timer, and T=T+ clocking values are closed, first two-value detector
Current state is set to 0;
If the state of second two-value detector is 0, the current state of second two-value detector is set to 0;
If the state of third two-value detector is 0, the current state of third two-value detector is set to 0;
S328:Data are subjected to serial ports output, and circulation step S321.
6. the traffic abnormal incident detecting system according to claim 5 based on binary sensor, it is characterised in that:It is described
Step S33 is comprised the following steps:
S331:Serial data is read, and judges whether identity ID matches, is terminated if identity ID is mismatched, if body
Part mark ID matchings then execute S332;
S332:Whether decision instruction is flow, if so, serial ports sends three two-value detector current state values and count value P,
And S333 is executed, if it is not, then executing S333;
S333:Whether decision instruction is time occupancy, if so, serial ports sends variable T, and S334 is executed, if it is not, then executing
S334;
S334:Three two-value detector current states, count value and variable T are set to 0;
S335:Terminate.
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Application publication date: 20181023 |