CN210865097U - Traffic signal lamp control system based on traffic volume - Google Patents
Traffic signal lamp control system based on traffic volume Download PDFInfo
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- CN210865097U CN210865097U CN201921662470.9U CN201921662470U CN210865097U CN 210865097 U CN210865097 U CN 210865097U CN 201921662470 U CN201921662470 U CN 201921662470U CN 210865097 U CN210865097 U CN 210865097U
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Abstract
The utility model relates to a traffic signal lamp control system based on wait traffic volume. The method mainly comprises the steps of obtaining images of units to be passed through a camera set, forming the amount of the units to be passed based on the images, and further obtaining the duration required by corresponding signal lamps. The above system is unlike the prior art in which the duration of the signal lamp is a fixed value. The system can prevent the signal lamp from being overlong in time length, and the overlong time length can cause time waste and overlong waiting time of vehicles in other directions. The system can not cause the short time of the signal lamp, and the short time easily causes that part of the units to be passed do not have time to pass the intersection or run yellow light or red light. The utility model discloses be favorable to the camera resource that make full use of crossing set up, improve the current efficiency in crossing.
Description
Technical Field
The utility model relates to a traffic signal lamp control field especially relates to traffic signal lamp control system.
Background
With the development of technologies such as image processing, internet of things and cloud computing, the camera is widely applied to urban data collection and security monitoring. The cameras and the technical support behind the cameras make the cameras become popular 'sky-eye' systems and also become 'standard matches' of 'smart cities' no matter in communities, roads, parks and construction sites.
In the aspect of traffic management, the main functions of the camera are generally to match various sensors to take illegal snapshots, snapshot of entering and leaving cities and conventional driving records. This makes the camera play certain supplementary effect only after the adverse event takes place, especially in the traffic crossing that the camera is intensive. In a sense, this is a waste of existing camera resources. In the concept of "smart city", people usually prefer the ability of "smart" to intervene and act actively in advance, so as to prevent or reduce the occurrence of traffic accidents, rather than simply recording events. Therefore, how to utilize the camera resources to improve the crossing traffic efficiency is a problem to be solved.
SUMMERY OF THE UTILITY MODEL
Based on this, a traffic signal lamp control system is provided. The camera resources of the traffic intersection can be utilized, and the intersection passing efficiency is improved.
A traffic signal light control system based on an amount of traffic waiting, comprising:
a camera set;
a signal lamp controller;
the intersection computing unit comprises a central controller, an instruction conversion and transmission module, a data processing module, a data interaction module and a data storage module, wherein the central controller is respectively connected with the instruction conversion and transmission module, the data processing module, the data interaction module and the data storage module,
the data interaction module is respectively connected with the camera set and the data processing module and used for acquiring image data of the camera set and sending the image data to the data processing module, the data processing module comprises an image processing submodule and a signal lamp duration calculation submodule, the image processing submodule is used for acquiring a traffic waiting amount according to the image data, the signal lamp duration calculation submodule is used for acquiring duration required by a signal lamp according to the traffic waiting amount, the central controller can send the duration required by the signal lamp to the instruction conversion sending module,
the command conversion and transmission module is connected with the camera set and the signal lamp controller and used for converting the control command transmitted by the central controller and transmitting the converted control command to the control camera set and the signal lamp controller.
The system can acquire the image of the unit to be passed through by the camera set, and the amount to be passed is formed based on the image, so that the time length required by the corresponding signal lamp is acquired. The above system is unlike the prior art in which the duration of the signal lamp is a fixed value. The system can prevent the signal lamp from being overlong in time length, and the overlong time length can cause time waste and overlong waiting time of vehicles in other directions. The system can not cause the short time of the signal lamp, and the short time easily causes that part of the units to be passed do not have time to pass the intersection or run yellow light or red light.
In one embodiment, the command conversion and transmission module comprises a camera command conversion transmitter and a signal lamp control command conversion transmitter.
In one embodiment, the camera group comprises three cameras, namely a camera a, a camera B and a camera C, wherein the camera a shoots a straight lane and a left turn lane of a motor vehicle lane, the camera B shoots a straight lane and a left turn lane of a motor vehicle lane, and the camera C shoots a sidewalk.
In one embodiment, the camera group comprises three cameras, namely a camera a, a camera B and a camera C, wherein the camera a shoots a straight lane of the motor vehicle lane, the camera B shoots a left turn lane of the motor vehicle lane, and the camera C shoots a sidewalk.
In one embodiment, the signal light controller is used for controlling signal lights of a straight lane of a motor vehicle lane, signal lights of a left turn lane of the motor vehicle lane and signal lights of a sidewalk.
In one embodiment, the signal lamp controller controls the signal lamp of the left-turn lane of the motor lane to turn to green when the signal lamp of the sidewalk for the pedestrians to pass and the signal lamp of the straight lane of the motor lane are turned to red.
Drawings
Fig. 1 is a schematic diagram of a traffic signal lamp control system according to an embodiment of the present invention.
Fig. 2 is a flowchart of a traffic signal lamp control method according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a method for calculating a traffic waiting amount of a motor vehicle lane according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a method for calculating the waiting traffic of the sidewalk according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of two cameras arranged on the same road according to the embodiment of the present invention.
Fig. 6 is a schematic diagram of three cameras respectively aiming at different roads according to the embodiment of the present invention.
Fig. 7 is a schematic signal transmission diagram of a traffic signal lamp control system according to an embodiment of the present invention.
Wherein:
1. camera group 2, intersection calculation unit 3 and signal lamp controller
21. Instruction conversion and transmission module 211 and camera instruction conversion and transmission device
212. Signal lamp control instruction conversion transmitter 23 and data interaction module
22. Data processing module 221, image processing submodule
222. Signal lamp duration calculation submodule 24 and data storage module
241. Experience sheet 242, speed stack 25, central controller
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, an embodiment of the utility model provides a traffic signal lamp control system based on wait traffic volume, include:
the camera group 1 is provided with a camera module,
a signal lamp controller (3) is provided,
the intersection calculating unit 2 comprises a central controller 25, an instruction conversion sending module 21, a data processing module 22, a data interaction module 23 and a data storage module 24, wherein the central controller 25 is respectively connected with the instruction conversion sending module 21, the data processing module 22, the data interaction module 23 and the data storage module 24,
the data interaction module 23 is respectively connected with the camera group 1 and the data processing module 22, for acquiring image data of the camera group 1 and sending the image data to the data processing module 22, the data processing module 22 includes an image processing sub-module 221 and a signal light time length calculating sub-module 222, the image processing submodule 221 is configured to obtain a traffic volume according to the image data, the signal lamp duration calculation submodule 222 is configured to obtain a duration required by a signal lamp according to the traffic volume, the central controller 25 may transmit the time duration required for the signal lamp to the command conversion transmission module 21, the instruction conversion and transmission module 21 is connected with the camera group 1 and the signal lamp controller 3, and is used for converting the control instruction sent by the central controller 25 and sending the converted control instruction to the control camera group 1 and the signal lamp controller 3.
In this embodiment, the command conversion and transmission module 21 includes a camera command conversion transmitter 211 and a signal light control command conversion transmitter 212. The camera command conversion transmitter 211 and the winker control command conversion transmitter 212 may employ a conversion transmitter in the related art.
The system can acquire the time length required by the corresponding signal lamp based on the traffic waiting amount formed by traffic units waiting for traffic on the road, and the time length of the signal lamp is not a fixed value in the prior art. The system can prevent the signal lamp from being overlong in time length, and the overlong time length can cause time waste and overlong waiting time of vehicles in other directions. The system can not cause the short time of the signal lamp, and the short time easily causes that part of the units to be passed do not have time to pass the intersection or run yellow light or red light.
When in use, the system can be arranged at each intersection. When the signal lamp needs to turn green, the central controller 25 enables the instruction conversion sending module 21 to send an instruction to the camera set 1, specifically, the instruction can be completed by the camera instruction conversion sending module 211, the camera set 1 starts to send image information to the data interaction module 23 after receiving the instruction, and the data interaction module 23 informs the central controller 25 of completing image transmission. The central controller 25 makes the data processing module 22 extract the image from the data interaction module 23 to the image processing sub-module 221 for analysis, so as to obtain the traffic volume to be passed. The specific calculation method can adopt the method in the prior art. The application also introduces how to obtain the waiting traffic.
The time length required by the signal lamp can be obtained through the waiting traffic volume, the central controller 25 can send the time length required by the signal lamp to the instruction conversion and sending module 21, and the signal lamp control instruction converter 212 converts the control instruction and sends the converted control instruction to the signal lamp controller 33 to control the time length of the signal lamp.
The method for obtaining the time length required by the signal lamp through the waiting traffic volume will be described in detail later.
In this embodiment, the camera group 1 includes three cameras, which are a camera a, a camera B, and a camera C, respectively, the camera a photographs a straight lane and a left-turn lane of a motor vehicle lane, the camera B photographs a straight lane and a left-turn lane of a motor vehicle lane, and the camera C photographs a sidewalk.
In this embodiment, the camera group 1 includes three cameras, which are a camera a, a camera B, and a camera C, respectively, where the camera a photographs a straight lane of a motor vehicle lane, the camera B photographs a left turn lane of the motor vehicle lane, and the camera C photographs a sidewalk.
In this embodiment, the signal lamp controller is used for controlling a signal lamp of a straight lane of a motor vehicle lane, a signal lamp of a left turn lane of the motor vehicle lane, and a signal lamp of a sidewalk.
In this embodiment, when the signal lamp controller controls the signal lamp of the sidewalk through which pedestrians pass and the signal lamp of the straight lane of the motorway to turn into red lamps, the signal lamp controller controls the signal lamp of the left-turn lane of the motorway to turn into green lamps.
As shown in fig. 2, the embodiment of the present invention further provides a method for calculating the time length of a traffic signal lamp based on the traffic volume, including:
s100, obtaining a traffic unit image waiting for traffic on a traffic road of the current intersection, and obtaining the current traffic waiting amount on the traffic road according to the image of the traffic unit.
S200, acquiring actual passing speed of a road corresponding to the upstream intersection and the passing road, acquiring upstream side passing speed according to the actual passing speed, acquiring experience speed of the passing road of the current intersection according to the current traffic waiting amount, and acquiring estimated speed corresponding to the current passing of the passing road of the current intersection according to the upstream side passing speed and the experience speed.
S300, calculating a passing time according to the current traffic waiting amount and the estimated speed, where the passing time is (traffic waiting amount/estimated speed) + T, and T is a reserved crossing passing time, that is, the passing time can be calculated by the following formula:
wherein, testIs the passage time, c is the amount to be passed, vestIs the estimated speed and T is the reserved crossing time.
And determining the duration of the signal lamp according to the passing time. Wherein, the time length of the signal lamp can be equal to the calculated passing time.
It should be noted that, in the above method, T is reserved crossing time, is preset fixed time, and can be specifically set and adjusted according to actual conditions. And the T is set, so that the last passing unit can conveniently pass through the intersection. Because the actual traffic speed at the intersection on the upstream side and the experienced speed at the current intersection are both calculated from the first traffic unit departure stop line to the last traffic unit departure stop line according to the above method. The estimated speed is calculated according to the two speeds, so the calculated time only enables the last traffic unit to just leave the stop line, and the last traffic unit does not really pass through the intersection area after leaving the stop line, and the last traffic unit needs a certain time to pass through the intersection area to enter other roads. Therefore, the last traffic unit needs a certain time to pass through the intersection area.
In this embodiment, the passing unit may be a vehicle or a pedestrian. The road of the current intersection can be a straight road of the current intersection, and can also be a left-turn road of the current intersection, and the like.
In particular, the above method may be used only for sidewalks to control the operation of the signal lights of the sidewalks. It is also possible that the above method is used only for a motor vehicle lane to control the operation of the signal lights of the motor vehicle lane. It is also possible that the above method is used for both motorways and sidewalks.
Furthermore, the above method may be used only for straight lanes of a motor vehicle lane. It may also be used only for left-hand turns of a motor vehicle lane. But also can be used for straight lanes, left-turn lanes and the like of motor vehicle lanes.
In the method, the passing unit image to be passed at this time can be obtained by using the camera arranged at the intersection, and then the passing amount at this time is obtained. The empirical speed of the passing road at the current intersection can be obtained according to the current traffic volume to be passed, the estimated speed of the passing can be obtained through the empirical speed and the upstream side passing speed, and the passing time of the passing can be calculated through the current traffic volume to be passed and the estimated speed. The duration of the signal light may be equal to the transit time. The calculated passing time not only considers the waiting passing amount and the experience speed of the road, but also considers the passing speed of the upstream side, so that the crossing passing efficiency is improved.
In step S100, a traffic unit image waiting for traffic on a traffic road of the current intersection is obtained, and the traffic unit image can be obtained by setting a camera at the intersection and using the camera.
Specifically, as shown in fig. 5 to 7, the camera a is aligned with the left lane of the motor vehicle, the camera B is aligned with the straight lane of the motor vehicle, and when the straight lane needs to be shifted from red to green, only the straight lane in the image is analyzed and calculated. When the left turn needs to be changed from red light to green light, only the left turn in the image is analyzed and calculated. And the camera C is aligned with the sidewalk, and only analyzes and calculates the sidewalk in the image when the sidewalk needs to turn to green light from red light. When the camera A, the camera B and the camera C are placed, the stop line on the road is ensured to appear at the lower end of the image. The stop line is the line that the vehicle can not cross when waiting for the red light, and the stop line of the sidewalk is the line that the pedestrian can not cross when waiting for the red light.
Further, the camera may also be provided in the following manner. For the straight road and the left turn road of the motor vehicle lane, the camera A and the camera B can be used for shooting at the same time, and the pictures can be spliced exactly and seamlessly. That is, the camera a photographs both a left-turning vehicle and a straight-going vehicle, and the camera B photographs both a left-turning vehicle and a straight-going vehicle. Since it is easy to distinguish a left-turn vehicle from a straight-going vehicle in the existing image recognition technology, they are easily discriminated in terms of white lines. Only the right side of the image is recognized when turning left and the left side when going straight. Camera a acts as the primary camera and camera B acts as the secondary camera, for example in fig. 5, camera B may take a further distance of the vehicle.
As shown in fig. 3, the unit to be passed is represented by a rounded rectangle, the unit to be passed is a vehicle in fig. 3, and the solid line is a stop line. The accurate quantity of the unit of waiting to pass that need not accurate judgement during image analysis, because the interval between the unit of passing also has very big influence to the speed of passing, only need transversely cut apart according to equivalent or inequality (from down reducing in proper order) to the image, form the counter, from down up with being close to the last counter of the unit of waiting to pass as the standard, the figure that the counter corresponds is promptly the volume of waiting to pass, so this is a logical quantity, it is not the actual quantity, be the rough description to the distance between first unit of passing to the last unit of passing, consequently can be with the volume of waiting to pass calculation speed. As shown in fig. 4, the unit to be passed (pedestrian) is represented in a simple human shape, and the solid line is a stop line, and similarly to the calculation for the vehicle, the number of specific pedestrians is not recognized for the image, but the count line corresponding to the last pedestrian is recognized. The amounts to be traveled in the examples of fig. 3 and 4 are 8 and 6, respectively, both taking into account the influence of the unit and the unit back-and-forth gap on the later calculated actual traffic speed. The specific identification method for the vehicles and the pedestrians can be realized through the existing image identification algorithm.
In step S200, the method for acquiring the upstream traffic speed includes:
when the upstream crossing only has the traffic unit of the straight road or only has the traffic unit of the left-turn road to enter the current crossing, the upstream side traffic speed is the actual traffic speed of the straight road or the actual traffic speed of the left-turn road,
when the upstream intersection has a unit of going straight to enter the current intersection and a unit of going left to enter the current intersection, the upstream side traffic speed is as follows: (actual passing speed of straight lane + actual passing speed of left-hand lane)/2.
The following examples are given. Table 1 shows the upstream-side traffic speed corresponding to the direct road from south to north at the current intersection, and the upstream-side traffic speed corresponding to the road from south to west at the current intersection.
TABLE 1
Specifically, a speed stack 242 may be provided, and the speed stack 242 is used to record the actual traffic speed of the corresponding road transmitted from the upstream intersection. 2 actual pass speeds can be recorded in the speed stack 242, that is, the 2 actual pass speeds are not recorded in the speed stack 242. The 2 actual passing speeds may include actual passing speeds of a straight road and a left-turn road corresponding to the upstream intersection, that is, vehicles of the straight road and the left-turn road of the upstream intersection are considered to enter the current intersection. In step S200, in calculating the estimated speed, 2 actual passage speeds in the speed stack 242 are fetched. When the 2 actual pass speeds are fetched, the 2 actual pass speeds are not in the stack. The speed stack 242 can re-record the actual traffic speed coming from the new upstream intersection.
Taking the straight road at the current intersection as an example, vehicles on the straight road at the upstream intersection and the left-turn road may enter the current intersection. Therefore, 2 actual traffic speed values are stored in the speed stack 242 of the current intersection, which correspond to the straight road and the left-turn road of the upstream intersection, respectively. When none of the 2 actual passage speed values in the speed stack 242 is 0, in step S200, the upstream side passage speed is the average of the 2 values in the speed stack 242 at the time of calculating the estimated speed. When 1 value in the velocity stack 242 is 0 and the other value is not 0, the upstream side traffic velocity is a value other than 0 in the velocity stack 242 in calculating the estimated velocity in step S200. The following is a detailed description of specific calculation formulas.
It will be appreciated that the above-described manner of storing the speed stack 242 is by way of example only. Other storage means are also possible. Further, in calculating the actual passing speed of the straight lane or the actual passing speed of the left-hand lane, the following formula may be applied:
vprathe actual traffic speed; c is the amount to be passed; t is tpraThe calculation method is as follows: in all the passing units waiting for passing of the passing road of the current intersection, the first passing unit passes through the stop line of the passing road to start timing, the last passing unit passes through the stop line of the passing road to stop timing, and the time used in the whole process is tpra。
In the method, after each intersection acquires the actual traffic speed of the traffic road of the intersection, the actual traffic speed is sent to the intersection on the downstream side for use by the intersection on the downstream side. For example, the actual traffic speed of the straight road from south to north and the actual traffic speed of the road turning left from west to north at the intersection are transmitted to the intersection at the downstream side, so that the intersection at the downstream side can calculate the traffic time t of the straight road from south to north and the road turning left from south to westestThe preparation is used.
In this embodiment, the obtaining of the experience speed of the passing road at the current intersection according to the current traffic volume to be passed is implemented by the following method:
learning the experience speed of the current intersection, specifically, obtaining the experience speeds corresponding to different traffic volumes through the following formula:
vexp＝vexp+β(vpra-vexp)， (3)
wherein v isexpEmpirical speed β is a step size parameter with a positive value less than 1 vpraThe actual traffic speed; c is the amount to be passed; t is tpraThe calculation method is as follows: in all the passing units waiting for passing of the passing road of the current intersection, the first passing unit passes through the stop line of the passing road to start timing, the last passing unit passes through the stop line of the passing road to stop timing, and the time used in the whole process is tpra，
And calling a corresponding experience speed according to the current traffic waiting amount.
It should be noted that the empirical speed can be calculated by the above equations (3) and (2) and updated according to the amount of waiting traffic. That is, for a traffic volume c, when tpraChange is made, then vpraAnd the empirical speed v corresponding to the waiting traffic c is changedexpAfter recalculation by equation (3), a new value is obtained. That is, v corresponding to the original waiting traffic c is utilizedexpAnd v obtained by new calculationpraSubstituting into formula (3), calculating to obtain new vexpThe value of (c).
In actual use, the above method may establish an empirical table 241. The experience table 241 stores the amount to be passed and the corresponding experience speed. The experience table 241 is a data structure of a sequence table, in which there are n units, the number of each unit is the corresponding waiting traffic, the experience speed corresponding to the waiting traffic is stored in the unit, and when the experience speed is taken out or updated, the inquiry and modification to the unit data of the corresponding number are performed. That is, after each time the empirical speed is extracted, the corresponding data in the empirical table 241 may be updated through the current calculation. Prior to learning, the experience table 241 is initialized to store an order table of all 0's.
Further, the estimated speed is obtained by the following formula:
wherein v isestTo estimate the velocity, where λ is the estimated rate and λ is initially 1, α is a step size parameter, positive values less than 1;
when the upstream crossing only has the traffic unit of the straight road or only has the traffic unit of the left-turn road to enter the current crossing, ∑ vpriorThe actual passing speed of the straight road or the actual passing speed of the left-turn road is obtained, wherein n is 1,
when the upstream crossing has the passing unit of the straight road to enter the current crossing and the left turn road to enter the current crossing, ∑ vpriorComprises the following steps: and the sum of the actual passing speed of the straight-going road and the actual passing speed of the left-turning road is 2.
Note that the estimation rate λ can be updated by the above equation (5). By continuously updating, the estimated rate λ is gradually reduced from 1. Proved by experiments, when the lambda is less than or equal to 0.8, the passing time t obtained by the method of the utility model is utilizedestThe time of the signal lamp is controlled, and the effect of improving the crossing traffic efficiency is remarkable. When λ is close to 1, the effect is not as remarkable as λ ≦ 0.8. That is, when λ is greater than 0.8, the time duration of the signal lamp can also be controlled using conventional methods in the prior art, i.e., the time duration of the signal lamp can take a fixed time length without using the transit time testAnd controlling the duration of the signal lamp. When lambda is less than or equal to 0.8, the passing time t is obtained by the formula (1) of the methodestControlling the duration of the signal lights, making the duration of the signal lights, etcAt the passage time test。
The embodiment of the utility model provides a traffic signal lamp control method based on waiting to pass volume is still provided, include the long calculation method of traffic signal lamp time based on waiting to pass volume still include:
and determining the duration of the signal lamp according to the passing time, and controlling the duration of the green light in the signal lamp according to the duration of the signal lamp.
In the present embodiment, the traffic units are pedestrians and vehicles, and when the pedestrian signal light for controlling the pedestrian traffic and the vehicle signal light of the straight lane are both red, the vehicle signal light of the left-turn lane is green.
Specifically, in the above method, the time length of the signal lamp is calculated by the above method for the straight lane, the left-turn lane and the sidewalk of the motor vehicle lane. The signal lamps of the straight lane of the motor vehicle lane and the sidewalk in the same direction can be simultaneously jumped to green lamps, if the vehicles on the straight lane of the motor vehicle lane pass through the red lamps, the signal lamps of the straight lane are changed into the red lamps, and the signal lamps on the sidewalk are changed into the red lamps, or if the pedestrians pass through the red lamps, the signal lamps on the sidewalk are changed into the red lamps, and the signal lamps on the straight lane are changed into the red lamps. But the left turn of the motorway is changed to green when the traffic lights of the straight road and the sidewalk are changed to red.
Specifically, the system can be arranged at each intersection. When the signal lamp needs to turn green, the central controller 25 enables the instruction conversion sending module 21 to send an instruction to the camera set 1, specifically, the instruction can be completed by the camera instruction conversion sending module 211, the camera set 1 starts to send image information to the data interaction module 23 after receiving the instruction, and the data interaction module 23 informs the central controller 25 of completing image transmission. The central controller 25 makes the data processing module 22 extract the image from the data interaction module 23 to the image processing sub-module 221 for analysis, obtains an estimation of the traffic volume to be passed, which is denoted as c, and sends the estimation to the central controller 25. The central controller 25 fetches the corresponding empirical speed from the experience table 241 stored in the data storage module 24 according to the amount of traffic to be passed, while in the speed stack 242 stored in the data storage module 24The actual passing speed of the corresponding road sent from the upstream intersection is taken out, and the value is sent to the signal lamp time length calculation submodule 222, and the signal lamp time length calculation submodule 222 calculates the estimated speed v through the formula (4)estThen, the passage time can be calculated by the formula (1). The central controller 25 will obtain the transit time testAnd the control command is sent to the signal lamp control command converter 212 as a control command, and the signal lamp control command converter 212 converts the control command and sends the converted control command to the signal lamp controller 33 to control the duration of the signal lamp.
It should be noted that the above empirical speed can be obtained by the data processing module 22 according to the formulas (2) and (3) and stored in the empirical table 241. Actual transit time t in the above equation (2)praCan be obtained by means of the system described above. That is, when the passing unit shows that the first passing unit starts to cross the stop line in the camera group 1, the central controller 25 starts to time, and when the passing unit shows that the last passing unit just passes the stop line in the camera group 1, the central controller 25 stops to time, so that the actual passing time t can be obtainedpraAnd calculates the actual traffic speed according to the formula (2), where the actual traffic speed can be calculated by the central controller 25. And is transmitted to the downstream side intersection by means of the data interaction module 23 or by means of a wireless transmission module built in the central controller 25, and is stored in a data storage module corresponding to the downstream side intersection.
It will be appreciated that the above-described system of the present application is not limited to the above-described method of use. For example, the system may be learned first, and the system may count the time taken for the traffic volume to pass through the current intersection on the passing road of the current intersection, and establish the correspondence between the traffic volume to pass and the passing time. The system learns the required passing time of different waiting passing amounts to obtain a comparison table, and the comparison table is stored. For the same traffic volume and different traffic time, mathematical methods such as averaging can be adopted for processing, and finally a one-to-one correspondence relationship is formed. After the system finishes learning, the system can be used, the time required by the signal lamp is determined by calling the passing time corresponding to the waiting passing amount, and then the signal lamp can be controlled.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (2)
1. A traffic signal lamp control system based on traffic volume, comprising:
a group of cameras having a camera function,
a controller of the signal lamp is provided,
the intersection computing unit comprises a central controller, an instruction conversion and transmission module, a data processing module, a data interaction module and a data storage module, wherein the central controller is respectively connected with the instruction conversion and transmission module, the data processing module, the data interaction module and the data storage module,
the data interaction module is respectively connected with the camera set and the data processing module and used for acquiring image data of the camera set and sending the image data to the data processing module, the data processing module comprises an image processing submodule and a signal lamp duration calculation submodule, the image processing submodule is used for acquiring a traffic waiting amount according to the image data, the signal lamp duration calculation submodule is used for acquiring duration required by a signal lamp according to the traffic waiting amount, the central controller can send the duration required by the signal lamp to the instruction conversion sending module,
the command conversion and transmission module is connected with the camera set and the signal lamp controller and is used for converting the control command transmitted by the central controller and transmitting the converted control command to the control camera set and the signal lamp controller, the command conversion and transmission module comprises a camera command conversion transmitter and a signal lamp control command conversion transmitter,
the camera set comprises three cameras, namely a camera A, a camera B and a camera C, wherein the camera A shoots a straight lane and a left turn lane of the motorway, the camera B shoots a straight lane and a left turn lane of the motorway, the camera C shoots a sidewalk,
the signal lamp controller is used for controlling signal lamps of a straight lane of a motor vehicle lane, signal lamps of a left turn lane of the motor vehicle lane and signal lamps of a sidewalk.
2. The traffic signal light control system based on the amount to be traveled according to claim 1, wherein the signal light controller controls the signal light of the sidewalk through which pedestrians pass and the signal light of the straight lane of the motorway to turn to red light, and the signal light controller controls the signal light of the left turn lane of the motorway to turn to green light.
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