CN104167096A - Urban traffic congestion early warning method, device and system - Google Patents

Abstract

The invention provides an urban traffic congestion early warning method. The urban traffic congestion early warning method includes the following steps that traffic operation data under a continuous time series are obtained through an electromagnetic coil device buried in a road; running speed of a vehicle passing through the electromagnetic coil device at the current moment and space headway information between vehicles are calculated; on the basis of a predetermined time period, the average running speed and the average space headway information of the vehicles on a section of the road in some time period are calculated, and whether traffic congestion exists in the section of the road or not is judged. If it is judged that congestion does not exist, the steps are conducted, and collection and judgment are conducted continuously; if it is judged that congestion exists, control is conducted to send out early warning signals. The invention further provides an urban traffic congestion early warning device and system.

Description

A kind of urban traffic blocking method for early warning, device and early warning system

Technical field

The present invention relates to intelligent transportation early warning technology field, in particular to a kind of urban traffic blocking discriminating conduct, device and early warning system.

Background technology

Since 21 century, flourish along with automobile industry, the construction speed of traffic infrastructure continues the speed rising lower than automobile pollution, the structural traffic jam issue that traffic supply and not mating of transport need cause, in the many large and medium-sized Urban Sprawl in the whole world, has now become the bottleneck of many urban economy social developments.The country such as European Union, the U.S., Japan, China successively takes up research and how to alleviate traffic congestion, attempts the support rather than the resistance that allow traffic become urban development, the unbalance of structure of transport solution development and urban development root.Therefore, the Forecasting Methodology of urban traffic blocking and monitoring technique research are had to certain theory significance and great practice value.

Domesticly at present the research of traffic congestion is more rested on to theoretical aspect, the technology of using in Practical Project utilization process is less.At present both at home and abroad with maximum be that video frequency monitoring method judges urban road traffic congestion, but owing to utilizing spacing and the travelling speed of video extraction vehicle to there is certain error and delay, video image is differentiated process need high-performance computer simultaneously, need to expend larger construction costs.Therefore, how to design a kind of can the current traffic congestion state of rapid reaction and the low Congestion prediction technology of cost be the key issue of urban traffic blocking research instantly.

Summary of the invention

The object of the invention is to provide a kind of urban traffic blocking method of discrimination, device and early warning system, can realize fast differentiation and the early warning of traffic congestion, prevents the generation of urban traffic blocking event.

Above-mentioned purpose of the present invention realizes by the technical characterictic of independent claims, and dependent claims develops the technical characterictic of independent claims with alternative or favourable mode.

For reaching above-mentioned purpose, the technical solution adopted in the present invention is as follows:

A urban traffic blocking method for early warning, comprises the following steps:

Step 1, obtain be embedded in road section solenoid at vehicle through out-of-date produced electromagnetic pulse signal;

The electromagnetic pulse signal Ω of step 2, i car obtaining based on step 1 _i, obtain electromagnetic pulse signal generation time t _iwith duration Δ t _i;

Step 3, the electromagnetic pulse duration Δ t obtaining based on step 2 _iand the diameter length l of coil, the travelling speed v of calculating vehicle _i: v _i=l/ Δ t _i;

Step 4, the electromagnetic pulse signal Ω based on i+1 car _i+1, electromagnetic pulse signal generation time t _i+1with duration Δ t _i+1, the time headway Δ t of i+1 car of calculating and i car _{i, i+1}: Δ t _{i, i+1}=t _i+1-t _i;

The time headway Δ t of step 5, i+1 the car based on abovementioned steps gained and i car _{i, i+1}, the headstock interval d of i+1 car of calculating and i car _{i, i+1}: d _{i, i+1}=v _i* Δ t _{i, i+1};

Step 6, the electromagnetic pulse quantity n producing according to solenoid in the default time cycle, calculate the average running speed of vehicle in this period and average headway wherein:

$\stackrel{\‾}{v}=\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{v}_i,\stackrel{\‾}{d}=\frac{1}{n-1}\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}{d}_{i,i+1};$

Step 7, contrast average running speed and average headway judge that traffic is whether in congestion status:

If travelling speed be greater than the threshold speed of setting, and average headway be greater than the spacing threshold value of setting, judge and do not have traffic congestion, return to abovementioned steps 1;

If travelling speed be less than or equal to the threshold speed of aforementioned setting, or average headway be less than or equal to the spacing threshold value of setting, judge and have traffic congestion, control and send early warning signal.

According to object of the present invention, a kind of urban traffic blocking early warning system is also proposed on the other hand, this early warning system comprises:

Data collector for measuring vehicle travelling speed and space headway;

One or more processors, for controlling the operation of described urban traffic blocking early warning system; And

At least one storer, for storing data and the programmed instruction being used by described one or more processors;

Described one or more processor is configured to carry out the programmed instruction of storing in described storer, for controlling the vehicle gathering under the continuous time series data of advancing; And

Data based on gathered, carry out following calculating and deterministic process:

A) the electromagnetic pulse signal Ω of i the car based on gathered _i, obtain electromagnetic pulse signal generation time t _iwith duration Δ t _i;

B) based on electromagnetic pulse duration Δ t _iand the diameter length l of coil, the travelling speed v of calculating vehicle _i: v _i=l/ Δ t _i;

C) the electromagnetic pulse signal Ω based on i+1 car _i+1, electromagnetic pulse signal generation time t _i+1with duration Δ t _i+1, the time headway Δ t of i+1 car of calculating and i car _{i, i+1}: Δ t _{i, i+1}=t _i+1-t _i;

D) the time headway Δ t based on i+1 car and i car _{i, i+1}, the headstock interval d of i+1 car of calculating and i car _{i, i+1}: d _{i, i+1}=v _i* Δ t _{i, i+1};

E), according to the electromagnetic pulse quantity n of solenoid generation in the default time cycle, calculate the average running speed of vehicle in this period and average headway wherein:

$\stackrel{\‾}{v}=\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{v}_i,\stackrel{\‾}{d}=\frac{1}{n-1}\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}{d}_{i,i+1};$

F) contrast average running speed and average headway judge that traffic is whether in congestion status:

If travelling speed be greater than the threshold speed of setting, and average headway be greater than the spacing threshold value of setting, judge and do not have traffic congestion;

If travelling speed be less than or equal to the threshold speed of aforementioned setting, or average headway be less than or equal to the spacing threshold value of setting, judge and have traffic congestion, control and send early warning signal.

According to object of the present invention, the third aspect also proposes a kind of urban traffic blocking prior-warning device, comprising:

The first module, for obtain be embedded in road section solenoid at vehicle through out-of-date produced electromagnetic pulse signal;

The second module, for the electromagnetic pulse signal Ω of i car obtaining according to aforementioned the first module _i, obtain electromagnetic pulse signal generation time t _iwith duration Δ t _i;

The 3rd module, for according to the aforementioned electromagnetic pulse duration Δ t obtaining _iand the diameter length l of coil, the travelling speed v of calculating vehicle _i: v _i=l/ Δ t _i;

Four module, for according to the electromagnetic pulse signal Ω of i+1 car _i+1, electromagnetic pulse signal generation time t _i+1with duration Δ t _i+1, the time headway Δ t of i+1 car of calculating and i car _{i, i+1}: Δ t _{i, i+1}=t _i+1-t _i;

The 5th module, for according to the time headway Δ t of aforementioned i+1 car and i car _{i, i+1}, the headstock interval d of i+1 car of calculating and i car _{i, i+1}: d _{i, i+1}=v _i* Δ t _{i, i+1};

The 6th module, for the electromagnetic pulse quantity n producing according to solenoid in the default time cycle, calculates the average running speed of vehicle in this period and average headway wherein:

$\stackrel{\‾}{v}=\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{v}_i,\stackrel{\‾}{d}=\frac{1}{n-1}\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}{d}_{i,i+1};$

The 7th module, for contrasting average running speed and average headway and judge that according to result traffic is whether in congestion status:

If travelling speed be greater than the threshold speed of setting, and average headway be greater than the spacing threshold value of setting, judge and do not have traffic congestion, return to abovementioned steps 1;

If travelling speed be less than or equal to the threshold speed of aforementioned setting, or average headway be less than or equal to the spacing threshold value of setting, judge and have traffic congestion, control and send early warning signal.

From the above technical solution of the present invention shows that, beneficial effect of the present invention is:

1, in the solution of the present invention, designed brand-new traffic jam judging algorithm, the travelling speed based on vehicle and space headway, and compare with relevant national standard, according to comparative result, carry out early warning;

2, in the solution of the present invention, the calculated amount of warning algorithm is little, and each parameter, quantity of state continuous updating can carry out early warning incessantly, improves promptness and the continuity of early warning;

3, in the solution of the present invention, in the selection of source of early warning, (for example processor can adopt the microprocessor that Samsung produces can to adopt sensor ripe in prior art and processor, the electromagnetic induction coil that sensor can adopt Siemens Company to produce), be easily installed in all types of roads, and conveniently debug, effectively reduce the cost of early warning system, (in the market with the price of the traffic congestion video frequency monitoring system of equal accuracy of the present invention in 0.6 ten thousand dollars (being roughly equal to 3.7 ten thousand Renminbi) left and right);

4, utilize early warning scheme of the present invention, expansibility is strong.Each embodiment of the present invention possesses the collection of vehicle headstock spacing and speed information and analytic function, can carry out Congestion prediction to the road at device place.In preferred scheme, the traffic congestion communication that also can each prior-warning device be collected by wireless transmit network, to urban transportation operation management center, is realized the Congestion prediction function to all roads in whole city.

Accompanying drawing explanation

Fig. 1 is the realization flow schematic diagram of an embodiment of the present invention urban traffic blocking method for early warning.

Fig. 2 is the system architecture schematic diagram of an embodiment of the present invention urban traffic blocking early warning system.

Fig. 3 is the system architecture schematic diagram of another embodiment urban traffic blocking early warning system of the present invention.

Fig. 4 is the module diagram of an embodiment of the present invention urban traffic blocking prior-warning device.

Embodiment

In order more to understand technology contents of the present invention, especially exemplified by specific embodiment and coordinate appended graphic being described as follows.

As shown in Figure 1, according to preferred embodiment of the present invention, a kind of urban traffic blocking method for early warning, its realization comprises the following steps:

Step 1, obtain be embedded in road section solenoid at vehicle through out-of-date produced electromagnetic pulse signal;

The electromagnetic pulse signal Ω of step 2, i car obtaining based on step 1 _i, obtain electromagnetic pulse signal generation time t _iwith duration Δ t _i;

Step 3, the electromagnetic pulse duration Δ t obtaining based on step 2 _iand the diameter length l of coil, the travelling speed v of calculating vehicle _i: v _i=l/ Δ t _i;

Step 4, the electromagnetic pulse signal Ω based on i+1 car _i+1, electromagnetic pulse signal generation time t _i+1with duration Δ t _i+1, the time headway Δ t of i+1 car of calculating and i car _{i, i+1}: Δ t _{i, i+1}=t _i+1-t _i;

The time headway Δ t of step 5, i+1 the car based on abovementioned steps gained and i car _{i, i+1}, the headstock interval d of i+1 car of calculating and i car _{i, i+1}: d _{i, i+1}=v _i* Δ t _{i, i+1};

Step 6, the electromagnetic pulse quantity n producing according to solenoid in the default time cycle, calculate the average running speed of vehicle in this period and average headway wherein:

$\stackrel{\‾}{v}=\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{v}_i,\stackrel{\‾}{d}=\frac{1}{n-1}\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}{d}_{i,i+1};$

Step 7, contrast average running speed and average headway judge that traffic is whether in congestion status:

If travelling speed be greater than the threshold speed of setting, and average headway be greater than the spacing threshold value of setting, judge and do not have traffic congestion, return to abovementioned steps 1;

If travelling speed be less than or equal to the threshold speed of aforementioned setting, or average headway be less than or equal to the spacing threshold value of setting, judge and have traffic congestion, control and send early warning signal.

Shown in Fig. 1, the method for early warning adopting in the present embodiment, travelling speed based on vehicle and space headway, and (for example can embody by threshold speed and the distance threshold of setting with relevant national standard, different roads has different standards, therefore can set different threshold values for different situations) compare, according to comparative result, carry out early warning, calculated amount is little on the one hand, calculating and judgement speed are fast, can reach the object of promptness, on the other hand, by continuous acquisition and real-time judge, can reach the effect of continuous real-time early warning.

As optional embodiment, the traffic congestion data in abovementioned steps can gather by the solenoid sensor being arranged in road.The such scheme of the present embodiment, especially, when being adapted to the occasion of charge station, can also utilize solenoid sensor pre-buried in existing charge station track to realize detection, without extra laying, cost-saving.

In the present embodiment, the predetermined period of time that abovementioned steps 6 is alleged, can preset and adjust according to actual conditions and accuracy requirement, for example, can be set as 3 minutes, or 5 minutes, certainly not as restriction.In the different time interval setting in the present embodiment, its result of bringing is the change of early warning precision, and value is less, and precision is higher.

The data that gather in abovementioned steps and the intermediate result of calculating, end product can be stored in storer, then by a processor in carrying out the process of aforementioned each step, call calculating and judgement that stored data are correlated with.

As optional embodiment, in preceding method, when judging at a certain sequence time in the cycle, while there is traffic congestion risk in road, control is sent to early warning signal, for example, can, by being arranged on road other display screen and/or loudspeaker, feed back to the people (for example driver and passenger) on road or in car, feedback form can be sound and/or optical feedback signal, for example the LED light display lamp of police whistle sound, buzzing or flicker.

In further embodiments, when judging within the cycle sometime, while there is traffic congestion risk in road, also can pass through a network, for example internet (Internet) sends early warning signal to long-range Surveillance center or Control Room, and then Ke Yougai Surveillance center or Control Room broadcast or issue pointedly early warning signal.

In further embodiments, when judging at a certain sequence time in the cycle, while there is traffic congestion risk in road, also can pass through dedicated network, for example traffic police's dedicated network, sends early warning information to the special-purpose monitor supervision platform of traffic police, predict current urban traffic blocking situation, thereby conveniently make early warning timely and take urgent measure in advance, such as the interception prompting of the voice interactive system/road surface traffic police by road surface etc., reducing the risk that road surface accident occurs.

According to the disclosure, as shown in Figure 2, a kind of urban traffic blocking early warning system, this early warning system comprises:

Data collector 10 for measuring vehicle travelling speed and space headway;

One or more processors 20, for controlling the operation of described urban traffic blocking early warning system; And

At least one storer 30, for storing data and the programmed instruction being used by described one or more processors 20;

Described one or more processor 30 is configured to carry out the programmed instruction of storing in described storer, for controlling the vehicle gathering under the continuous time series data of advancing; And

Data based on gathered, carry out following calculating and deterministic process:

A) the electromagnetic pulse signal Ω of i the car based on gathered _i, obtain electromagnetic pulse signal generation time t _iwith duration Δ t _i;

B) based on electromagnetic pulse duration Δ t _iand the diameter length l of coil, the travelling speed v of calculating vehicle _i: v _i=l/ Δ t _i;

C) the electromagnetic pulse signal Ω based on i+1 car _i+1, electromagnetic pulse signal generation time t _i+1with duration Δ t _i+1, the time headway Δ t of i+1 car of calculating and i car _{i, i+1}: Δ t _{i, i+1}=t _i+1-t _i;

D) the time headway Δ t based on i+1 car and i car _{i, i+1}, the headstock interval d of i+1 car of calculating and i car _{i, i+1}: d _{i, i+1}=v _i* Δ t _{i, i+1};

E), according to the electromagnetic pulse quantity n of solenoid generation in the default time cycle, calculate the average running speed of vehicle in this period and average headway wherein:

$\stackrel{\‾}{v}=\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{v}_i,\stackrel{\‾}{d}=\frac{1}{n-1}\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}{d}_{i,i+1};$

F) contrast average running speed and average headway judge that traffic is whether in congestion status:

If travelling speed be greater than the threshold speed of setting, and average headway be greater than the spacing threshold value of setting, judge and do not have traffic congestion;

If travelling speed be less than or equal to the threshold speed of aforementioned setting, or average headway be less than or equal to the spacing threshold value of setting, judge and have traffic congestion, control and send early warning signal.

In the present embodiment, as preferred scheme, for the data collector 10 of measuring vehicle travelling speed and space headway, comprise at least one electromagnetic induction coil sensor, be embedded under pavement of road, thus the convenient operation information that gathers driving vehicle on road.

One or more processors 20, as controlling and treating apparatus, for controlling data acquisition and the storage of aforementioned data harvester 10, for being preset according to gathered data call, the programmed instruction of storer 30 calculates and early warning judgement on the other hand on the one hand.Its computation process and early warning judgement, as previously mentioned.

In the present embodiment, preferably, one or more processors 20 adopt single-chip microcomputer to realize, and certainly in a further embodiment, also can adopt microprocessor to realize, for example or the microprocessor of producing.

Aforementioned memory 30, can adopt SD card, TF card, mmc card and other non-volatile data storage medium to realize.

One or more processors 20 are connected with aforementioned data harvester 10, storer 30 with data-interface by data line.

As preferred embodiment, as shown in Figure 2, this urban traffic blocking early warning system also comprises an indicating device 21, for example light-emitting diode display, or LED light, is connected to described one or more processor 20, for monitoring the running status of urban traffic blocking early warning system, for example whether the running status of data collector 10 occurs extremely, and whether data between each module connect smooth and easy etc., by text box or LED light, with suitable form, indicate.

In further embodiments, this urban traffic blocking early warning system can also setting operation face version, and contact type operation panel for example, or press input type guidance panel, in order to entering the operating instructions.

As preferred embodiment, as shown in Figure 2, this urban traffic blocking early warning system also comprises and also disposes a radio communication device 60 (for example 3G communication module), be connected to described one or more processor 20, for example, by accessing Internet (Internet) or dedicated network (traffic police dedicated network), to command centre, Surveillance center or Control Room, send early warning information, as previously mentioned, predict the traffic congestion risk of current road, thereby conveniently make early warning timely and take urgent measure in advance, reducing the seriousness that urban traffic blocking occurs.

As shown in Figure 2, as optional embodiment, this urban traffic blocking early warning system also comprises a loudspeaker 40, in described storer 30, also store preset alarm voice (congestion in road for example, change and travel etc.), when described one or more processors 20 are judged current time cycle memory in traffic congestion, control the alarm voice that this loudspeaker 40 is reported aforementioned storage.

In another embodiment, as shown in Figure 3, in earlier figures 2, can also replace with a smooth feedback assembly 50, this light feedback assembly can be configured to a LED array, an or double-colored demonstration LED, an or LED lamp, be connected to described one or more processor 20, in described storer 300, also store optical control signal (for example flicker that preset expression is reported to the police, or change the color showing), when described one or more processors 20 judge that current time cycle memory is when blocking up risk, control this light feedback assembly 50 with flicker, change the modes such as color demonstration and feed back early warning information.

In further embodiments, loudspeaker 40 and light feedback assembly 50 in earlier figures 2 and Fig. 3 can arrange simultaneously, feed back early warning information simultaneously.

According to of the present invention open, as shown in Figure 4, a kind of urban traffic blocking prior-warning device 100, comprising:

The first module 101, for obtain be embedded in road section solenoid at vehicle through out-of-date produced electromagnetic pulse signal;

The second module 102, for the electromagnetic pulse signal Ω of i car obtaining according to aforementioned the first module _i, obtain electromagnetic pulse signal generation time t _iwith duration Δ t _i;

The 3rd module 103, for according to the aforementioned electromagnetic pulse duration Δ t obtaining _iand the diameter length l of coil, the travelling speed v of calculating vehicle _i: v _i=l/ Δ t _i;

Four module 104, for according to the electromagnetic pulse signal Ω of i+1 car _i+1, electromagnetic pulse signal generation time t _i+1with duration Δ t _i+1, the time headway Δ t of i+1 car of calculating and i car _{i, i+1}: Δ t _{i, i+1}=t _i+1-t _i;

The 5th module 105, for according to the time headway Δ t of aforementioned i+1 car and i car _{i, i+1}, the headstock interval d of i+1 car of calculating and i car _{i, i+1}: d _{i, i+1}=v _i* Δ t _{i, i+1};

The 6th module 106, for the electromagnetic pulse quantity n producing according to solenoid in the default time cycle, calculates the average running speed of vehicle in this period and average headway wherein:

$\stackrel{\‾}{v}=\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{v}_i,\stackrel{\‾}{d}=\frac{1}{n-1}\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}{d}_{i,i+1};$

The 7th module 107, for contrasting average running speed and average headway and judge that according to result traffic is whether in congestion status:

If travelling speed be greater than the threshold speed of setting, and average headway be greater than the spacing threshold value of setting, judge and do not have traffic congestion, return to abovementioned steps 1;

If travelling speed be less than or equal to the threshold speed of aforementioned setting, or average headway be less than or equal to the spacing threshold value of setting, judge and have traffic congestion, control and send early warning signal.

The present embodiment, function, effect and the workflow of the first module 101, the second module 102, the 3rd module 103, four module 104, the 5th module 105, the 6th module 106, the 7th module 107 done corresponding explanation embodiment illustrated in fig. 1, do not repeat them here.

Although the present invention discloses as above with preferred embodiment, so it is not in order to limit the present invention.Persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is when being as the criterion depending on claims person of defining.

Claims (8)

1. a urban traffic blocking method for early warning, is characterized in that, comprises the following steps:

Step 1, obtain be embedded in road section solenoid at vehicle through out-of-date produced electromagnetic pulse signal;

The electromagnetic pulse signal Ω of step 2, i car obtaining based on step 1 _i, obtain electromagnetic pulse signal generation time t _iwith duration Δ t _i;

Step 3, the electromagnetic pulse duration Δ t obtaining based on step 2 _iand the diameter length l of coil, the travelling speed v of calculating vehicle _i: v _i=l/ Δ t _i;

Step 4, the electromagnetic pulse signal Ω based on i+1 car _i+1, electromagnetic pulse signal generation time t _i+1with duration Δ t _i+1, the time headway Δ t of i+1 car of calculating and i car _{i, i+1}: Δ t _{i, i+1}=t _i+1-t _i;

The time headway Δ t of step 5, i+1 the car based on abovementioned steps gained and i car _{i, i+1}, the headstock interval d of i+1 car of calculating and i car _{i, i+1}: d _{i, i+1}=v _i* Δ t _{i, i+1};

Step 6, the electromagnetic pulse quantity n producing according to solenoid in the default time cycle, calculate the average running speed of vehicle in this period and average headway wherein:

Step 7, contrast average running speed and average headway judge that traffic is whether in congestion status:

If travelling speed be greater than the threshold speed of setting, and average headway be greater than the spacing threshold value of setting, judge and do not have traffic congestion, return to abovementioned steps 1;

If travelling speed be less than or equal to the threshold speed of aforementioned setting, or average headway be less than or equal to the spacing threshold value of setting, judge and have traffic congestion, control and send early warning signal.

2. urban traffic blocking method for early warning according to claim 1, it is characterized in that, in preceding method, when judging within a certain cycle length, while there is traffic congestion situation in urban road, sound and/or light signal are sent in control, by being arranged on display screen and/or the loudspeaker on road side, feed back.

3. urban traffic blocking method for early warning according to claim 1, is characterized in that, in preceding method, when judging within the cycle sometime, when urban road exists traffic congestion situation, also by a network, to long-range transmission early warning signal.

4. a urban traffic blocking early warning system, is characterized in that, this early warning system comprises:

Data collector (10) for measuring vehicle travelling speed and space headway;

One or more processors (20), for controlling the operation of described urban traffic blocking early warning system; And

At least one storer (30), the data and the programmed instruction that for storage, by described one or more processors (20), are used;

Described one or more processor (30) is configured to carry out the programmed instruction of storing in described storer, for controlling the vehicle gathering under the continuous time series data of advancing; And

Data based on gathered, carry out following calculating and deterministic process:

A) the electromagnetic pulse signal Ω of i the car based on gathered _i, obtain electromagnetic pulse signal generation time t _iwith duration Δ t _i;

B) based on electromagnetic pulse duration Δ t _iand the diameter length l of coil, the travelling speed v of calculating vehicle _i: v _i=l/ Δ t _i;

C) the electromagnetic pulse signal Ω based on i+1 car _i+1, electromagnetic pulse signal generation time t _i+1with duration Δ t _i+1, the time headway Δ t of i+1 car of calculating and i car _{i, i+1}: Δ t _{i, i+1}=t _i+1-t _i;

D) the time headway Δ t based on i+1 car and i car _{i, i+1}, the headstock interval d of i+1 car of calculating and i car _{i, i+1}: d _{i, i+1}=v _i* Δ t _{i, i+1};

E), according to the electromagnetic pulse quantity n of solenoid generation in the default time cycle, calculate the average running speed of vehicle in this period and average headway wherein:

F) contrast average running speed and average headway judge that traffic is whether in congestion status:

If travelling speed be greater than the threshold speed of setting, and average headway be greater than the spacing threshold value of setting, judge and do not have traffic congestion;

If travelling speed be less than or equal to the threshold speed of aforementioned setting, or average headway be less than or equal to the spacing threshold value of setting, judge and have traffic congestion, control and send early warning signal.

5. urban traffic blocking early warning system according to claim 4, is characterized in that, the data collector (10) for measuring vehicle travelling speed and space headway, comprises at least one electromagnetic induction coil sensor, is arranged under pavement of road.

6. urban traffic blocking early warning system according to claim 4, it is characterized in that, this urban traffic blocking early warning system also comprises a loudspeaker (40) and/or light feedback assembly (50), is connected to described one or more processor (20).

7. urban traffic blocking early warning system according to claim 4, is characterized in that, this urban traffic blocking early warning system also comprises a radio communication device (60), is connected to described one or more processor (20).

8. a urban traffic blocking prior-warning device, is characterized in that, comprising:

The first module, for obtain be embedded in road section solenoid at vehicle through out-of-date produced electromagnetic pulse signal;

The second module, for the electromagnetic pulse signal Ω of i car obtaining according to aforementioned the first module _i, obtain electromagnetic pulse signal generation time t _iwith duration Δ t _i;

The 3rd module, for according to the aforementioned electromagnetic pulse duration Δ t obtaining _iand the diameter length l of coil, the travelling speed v of calculating vehicle _i: v _i=l/ Δ t _i;

Four module, for according to the electromagnetic pulse signal Ω of i+1 car _i+1, electromagnetic pulse signal generation time t _i+1with duration Δ t _i+1, the time headway Δ t of i+1 car of calculating and i car _{i, i+1}: Δ t _{i, i+1}=t _i+1-t _i;

The 5th module, for according to the time headway Δ t of aforementioned i+1 car and i car _{i, i+1}, the headstock interval d of i+1 car of calculating and i car _{i, i+1}: d _{i, i+1}=v _i* Δ t _{i, i+1};

The 6th module, for the electromagnetic pulse quantity n producing according to solenoid in the default time cycle, calculates the average running speed of vehicle in this period and average headway wherein:

The 7th module, for contrasting average running speed and average headway and judge that according to result traffic is whether in congestion status:

If travelling speed be greater than the threshold speed of setting, and average headway be greater than the spacing threshold value of setting, judge and do not have traffic congestion, return to abovementioned steps 1;

If travelling speed be less than or equal to the threshold speed of aforementioned setting, or average headway be less than or equal to the spacing threshold value of setting, judge and have traffic congestion, control and send early warning signal.