CN103761882A - Automatic crossroad traffic light control apparatus and application - Google Patents
Automatic crossroad traffic light control apparatus and application Download PDFInfo
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- CN103761882A CN103761882A CN201310579112.2A CN201310579112A CN103761882A CN 103761882 A CN103761882 A CN 103761882A CN 201310579112 A CN201310579112 A CN 201310579112A CN 103761882 A CN103761882 A CN 103761882A
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Abstract
The invention discloses an automatic crossroad traffic light control apparatus and application. The apparatus consists of an input device-matrix keyboard module, an output device, a sensing device, and a stored program digital computer. By corresponding to a program stored in the digital computer, the apparatus controls signal operation; and a clear or congestion state of the crossroad is sensed so as to control the state of the crossroad traffic light. On the basis of the control program, traffic light controlling is completed based on the flow set in advance according to all parameters as well as data transmitted by the sensing device of the system. according to the invention, the beneficial effects are as follows: when the crossroad traffic light apparatus controlled by the stored program digital computer works based on the mode, the optimum clear degree of the crossroad can be obtained and the crossroad traffic efficiency can be improved.
Description
Technical field
The present invention relates to a kind of crossroad controlling system of traffic light, particularly a kind of automatic cross crossroads traffic light control device and application.
Background technology
Along with increasing of China's automobile pollution, the magnitude of traffic flow of road increases day by day, and the pressure of intersection increases day by day, guarantees that smooth traffic and traffic safety just more and more seem important.Crossroad traffic congestion is a kind of typical traffic congestion.While often starting there is little stifled (also on possibility crossing, wherein a road automobile does not pass through completely) in central area, crossing, but because the red green timing of conventional traffic light alternately changes, cause each road automobile in succession to sail traffic congestion region into, finally form the staggered serious traffic jam of vehicle vertically and horizontally.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of automatic cross crossroads traffic light control device, in order to overcome the inherent shortcoming of traditional crossroad traffic lights.The ultimate principle of this device is as follows, when there is at the parting of the ways local obstruction, the traffic lights of all directions of this crossroad all sends out a warning, forbid that each side's automobile always enters in crossroad, just can make the automobile being trapped in crossroad leave voluntarily, thereby avoid for a long time serious traffic jam.After traffic congestion disappears, the traffic lights of these crossroad all directions can return to normal at once.To reach the object of alleviating the serious traffic jam in crossroad.
The technical scheme that the present invention solves the problems of the technologies described above is as follows:
1. an automatic cross crossroads traffic light control device consists of input equipment-matrix keyboard module 3, output device 4, sensing equipment 1 and storage program digital machine 2.
1) described storage program digital machine 2 is for storing the needed parameter of this system, and process the information that all input equipments and sensing equipment gather, it is by CPU (central processing unit) (CPU) 2-1, electricallyerasable ROM (EEROM) (EEPROM) 2-2, random-access memory (ram) 2-3, there is I, II, III, IV, input/output port (I/O) 2-4 of five ports of V and flash memory (FLASH) 2-5 form, electricallyerasable ROM (EEROM) (EEPROM) 2-2, random-access memory (ram) 2-3, input/output port (I/O) 2-4 is connected with CPU (central processing unit) (CPU) 2-1 respectively with flash memory (FLASH) 2-5, CPU (central processing unit) (CPU) 2-1 is by count/logical block (ALU) 2-1-1, control and timing circuit 2-1-3, random-access memory (ram) 2-1-2 forms, (ALU) 2-1-1 that counts/logical block is connected the latter two and is connected with control and timing circuit 2-1-3 respectively with random-access memory (ram) 2-1-2.
Described output device 4 is for showing whole system parameter and whole system running status, LCD display module 4-1 and red green pilot lamp and control circuit module 4-2, consists of.
Described sensing equipment 1 is for obtaining the pass blocking status information of monitored crossroad, and sends storage program digital machine 2 to after these information are processed, and camera 1-1, video input, consists of with decoding chip 1-2 and ultrasonic wave module 1-3.
2) the camera 1-1 of described sensing equipment 1 is connected with decoding chip 1-2 with video input, video input is connected with the input port I of storage program digital machine 2 with decoding chip 1-2, and the ultrasonic wave module 1-3 of sensing equipment 1 is connected with the input port II of storage program digital machine 2; Matrix keyboard module 3 is connected with the input port III of storage program digital machine 2; The output port IV of storage program digital machine 2 is connected with the LCD display module 4-1 of output device 4, and the output port V of storage program digital machine 2 is connected with the control circuit module 4-2 of output device 4.
Above-mentioned storage program digital machine is that the environment nowadays brightness gathering according to sensing equipment camera 1-1 carrys out dynamic calculation picture frame difference limen value.
Above-mentioned storage program digital machine comprises a storage program digital machine, and this storage program digital machine, except the program and crossroad state determining program of storage dynamic calculation picture frame difference limen value, also allows the further program of operation of storage.
2. for reliable lights state control is provided, and improve the timely degree of the response of traffic lights, above-mentioned storage program digital machine is carried out following steps simultaneously as far as possible:
1) need to choose a suitable threshold value for image frame difference method, first, camera 1-1 carries out after 100 two field picture samplings, takes out the brightness value of each frame and is averaging after cumulative.So just obtained now external environment condition average brightness value.Then according to average brightness value brightness and morning, noon and afternoon reference brightness value TM, TA, TN, calculate current image frame difference limen value.
2) improve the timely degree that traffic lights respond, avoided the generation of erroneous judgement, first the repeated sampling times N of the predefined anti-erroneous judgement of storage program digital computation chance read operation person, then carry out, after each crossroad access state judgement, this repeated sampling number of times being subtracted to 1 operation, and judging that whether this value is to 0, if to 0, directly exit epicycle judgement, if be not 0, proceed to judge next time.Until certain crossroad state has reached 3/4N.Then, then the vehicle height value of obtaining in conjunction with ultrasonic wave module decide this state whether effective.
3. the application of an automatic cross crossroads traffic light control device, when there is at the parting of the ways local obstruction, the traffic lights of all directions of this crossroad all sends out a warning, forbid that each side's automobile always enters in crossroad, just can make the automobile being trapped in crossroad leave voluntarily, thereby avoid for a long time serious traffic jam, after traffic congestion disappears, the traffic lights of these crossroad all directions can return to normal at once, to reach the object of alleviating the serious traffic jam in crossroad; After CPU (central processing unit) (CPU) 2-1 has read the systematic parameter of preserving in electricallyerasable ROM (EEROM) (EEPROM) 2-2.System enters real crossroad traffic lights state of a control.Now, camera 1-1 and ultrasonic wave module 1-3 have aimed at the overlapping region of crossroad.Consider three kinds of situations below:
1) road spaciousness, do not have car to pass through, now, between the luminance component of front and back two two field pictures that camera 1-1 obtains, almost there is no difference, after using frame difference algorithm to add up to the luminance component of two two field pictures, subtract each other, the value obtaining will inevitably be far smaller than picture frame difference limen value, then, CPU (central processing unit) (CPU) (2-1) continues to read the distance value that ultrasonic wave module (1-3) records, because now pass through without any car on road, the measured value of ultrasonic wave module (1-3) must be exactly the antenna height of ultrasonic wave module (1-3) with respect to road surface, so, now CPU (central processing unit) (CPU) (2-1) is controlled red green indicating lamp control circuit module (4-2) and is run well, between, traffic lights are forced to switch at regular intervals,
2) road has car to pass through, but do not get congestion, now, the movement of getting off due to crossroad, the luminance component of front and back two two field pictures that camera (1-1) obtains certainly exists larger difference, after using frame difference method to add up to the luminance component of two two field pictures, subtract each other, the value obtaining will inevitably be greater than picture frame difference limen value, in this case, storage program digital machine (2) directly judges that crossroad wagon flow is unobstructed, there is not any blocking up, and can not remove to read the distance measurement value of ultrasonic wave module (1-3), so, now storage program digital machine (2) is controlled red green indicating lamp control circuit module (4-2) and is run well, between, traffic lights carry out force handoff at regular intervals,
3) road has car to pass through, but occurred at the parting of the ways to block up, now, because the car below crossroad is slack, the luminance component of front and back two two field pictures that camera (1-1) obtains does not almost have difference, after using frame difference algorithm to add up to the luminance component of two two field pictures, subtract each other, the value obtaining is inevitable much smaller than picture frame difference limen value, then, storage program digital machine (2) continues to read the distance value that ultrasonic wave module (1-3) records, because now place, crossroad has occurred to block up, the measured value of ultrasonic wave module (1-3) must be exactly the height that the height that sets up with respect to road surface of ultrasonic wave module (1-3) deducts vehicle, so, now storage program digital machine (2) is controlled red green pilot lamp and control module (4-2) and is forced to flash the redlight, forbid that each side's automobile always enters in crossroad, the automobile being trapped in crossroad is left voluntarily, after traffic congestion disappears, the traffic lights of these crossroad all directions can return to normal at once.
Beneficial effect of the present invention: of the present inventionly will make crossroad obtain best fluency when moving in the above described manner according to the crossroad traffic light device of storage program digital machine control, improve the efficiency that is open to traffic of crossroad simultaneously.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure, sensing equipment 1, storage program digital machine 2, matrix keyboard module 3, output device 4, camera 1-1, video input and decoding chip 1-2, ultrasonic wave module 1-3, LCD display module 4-1, red green pilot lamp and control circuit module 4-2.
Fig. 2 is storage program digital machine structural representation.
In figure, storage program digital machine 2, CPU (central processing unit) (CPU) 2-1, electricallyerasable ROM (EEROM) (EEPROM) 2-2, random-access memory (ram) 2-3, input/output port (I/O) 2-4, flash memory (FLASH) 2-5.
Fig. 3 is storage program digital machine CPU (central processing unit) (CPU) 2-1 structural representation.
(ALU) 2-1-1 that in figure, counts/logical block, controls and timing circuit 2-1-3 random-access memory (ram) 2-1-2.
Fig. 4 is the structural representation of most preferred embodiment of the present invention.
In figure, the data 7 of storage program digital machine 2, sensing equipment 1, camera 1-1, video input and decoding chip 1-2, ultrasonic wave module 1-3, matrix keyboard module 3, LCD display module 4-1, traffic lights control interface 5, traffic lights 6, collection.
Fig. 5 is a total algorithm control program process flow diagram of the present invention.
Fig. 6 is an adaptive algorithm control program process flow diagram of the present invention.
Fig. 7 is traffic congestion of the present invention, unimpeded effective evaluation algorithm control program process flow diagram.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described with enforcement.
The present invention conceives with the storage program digital machine control system of crossroad traffic-light control device, thereby has reduced the intervention of manually crossroad access being stopped up.Certainly first to provide reliable lights state control, and improve the timely degree of the response of traffic lights simultaneously as far as possible.
According to above-mentioned requirements, draw two tasks.The first, need to choose a suitable threshold value for image frame difference method, because different time sections intensity of illumination all can be different, cause corresponding threshold value also can and then change.So same picture frame difference limen value is not that section is all feasible at any time, necessarily requires system self automatically to carry out threshold value adjustment according to the light intensity of external environment condition.The second, in order to improve the timely degree of traffic lights response, system has adopted N judgement to get most algorithms, has both avoided the generation of erroneous judgement, has improved again the timely degree of traffic lights responses.
1. as shown in Figure 1, automatic cross crossroads traffic light control device is comprised of sensing equipment 1, storage program digital machine 2, matrix keyboard module 3, output device 4, camera 1-1, video input and decoding chip 1-2, ultrasonic wave module 1-3, LCD display module 4-1, control circuit module 4-2 a kind of automatic cross crossroads traffic light of the present invention control device structure.Camera 1-1 completed the analog video signal of camera collection is changed through A/D and decode after send the video processing part of storage program digital machine to, this module and storage program digital machine are realized exchanges data by input/output interface I.Ultrasonic wave module 1-3 is for determining the distance of ultrasonic reflections place and ultrasonic wave module position, and this module and storage program digital machine are realized exchanges data by input/output interface II.Storage program digital machine 2, the interface that it provides modules to communicate by letter with CPU (central processing unit) (CPU), comprises I, II, III, IV, V totally 5 input/output end ports.Matrix keyboard module 3, for the operational factor of input system, this module and storage program digital machine are realized exchanges data by input/output interface III.Output device 4, comprises the LCD display module 4-1 for output system core parameter, and this module and storage program digital machine are realized exchanges data by input/output interface IV.Red green pilot lamp and control circuit module 4-2, this module and storage program digital machine are realized exchanges data by input/output interface V, realize the control of the running status of crossroad.
2. as shown in Figure 2, the microcontroller of storage program digital machine 2 is comprised of CPU (central processing unit) (CPU) 2-1, electricallyerasable ROM (EEROM) (EEPROM) 2-2, random-access memory (ram) 2-3, input/output port (I/O) 2-4, flash memory (FLASH) 2-5 the microcontroller architecture of storage program digital machine 2.CPU (central processing unit) (CPU) 2-1 of integrated circuit.Electricallyerasable ROM (EEROM) (EEPROM) 2-2 is the place that whole crossroad controlling system of traffic light parameter is deposited.Random-access memory (ram) 2-3 is the place of the control program operation of whole crossroad controlling system of traffic light.Input/output port (I/O) 2-4, comprises input/output end port I, II, III, IV, the V corresponding with Fig. 1, is used for realizing the interconnected and exchanges data of storage program digital machine in Fig. 12 and external device (ED).Flash memory (FLASH) 2-5, is used for storing the control program of whole crossroad controlling system of traffic light.CPU (central processing unit) (CPU) 2-1 is connected above-mentioned parts with address bus by data bus, and by control bus, realizes all parts and work in an orderly manner.When by the combination of it and crossroad traffic lights, once the parameter of operator's input system, arrive the input port of storage program digital machine 2, first application system deposits the data of operator's input in electricallyerasable ROM (EEROM) (EEPROM) 2-2, and then application system just can be handled all control functions completely.
3. as shown in Figure 3, CPU (central processing unit) (CPU) 2-1 comprises count/logical block (ALU) 2-1-1 to the structure of CPU (central processing unit) (CPU) 2-1, controls and timing circuit 2-1-3 random-access memory (ram) 2-1-2.It is comprised of a storage register array, and this array is known.Conventionally, comprise especially the accumulator register of one of operand that a storage will operate by count/logical block (ALU) 2-1-1, a programmable counter, order register and demoder and address register.
(ALU) 2-1-1 that counts/logical block carries out by the binary data that offers it logical operation that counts.Although do not demonstrate, this count/logical block (ALU) 2-1-1 also comprises an address, and this address can be according to the content of two registers of binary arithmetic logical combination.This device allows this processor execution to count and operates the data that obtain from storer.Control and timing circuit 2-1-3 are the major function unit in CPU (central processing unit) (CPU) 2-1, are used for keeping required Processing tasks to need the correct order of process.After instruction is removed and decodes, control circuit adopts the suitable processing behavior of suitable signal enabling.
The structure of most preferred embodiment of the present invention as shown in Figure 4, a kind of automatic cross crossroads traffic light control device structural representation shown in its corresponding diagram 1.Whole system function links together by the large bus of three described in Fig. 2 and Fig. 3, and storage program digital machine 2 is through the state of multiple logic interfacing co-controlling traffic lights 6.Wherein logic interfacing comprises that frame difference limen value reads, adaptive threshold adjustment, ultrasonic equipment height value are read, cycle criterion number of times reads, blocks up/unimpeded effective judgement.All these logic interfacings are using the data 7 of the data of operator's input or camera 1-1 and ultrasonic wave module 1-3 collection as input, through a series of logical operations, the state of output traffic lights, to traffic lights control interface 5, completes lights state by traffic lights control interface 5 and changes.
5. as shown in Figure 5, whole program step is all that a series of dependent instructions that are stored on storage program digital machine flash memory (FLASH) by execution complete to a total algorithm control program process flow diagram.When operator opens after this cover system, first storage program digital machine 2 carries out initialization to each hardware module, comprising: camera 1-1, ultrasonic wave module 1-3, LCD display module 4-1, red green pilot lamp and control circuit module 4-2.Subsequently, immediately reading and saving at storage program digital machine electric erasable the systematic parameter in memory read (EEPROM) 2-2, comprise repeated sampling times N, the automobile altitude range (cm) of the poor threshold value of camera frame, the anti-erroneous judgement of camera, these three parameters are using the judgment basis as crossroad pass blocking situation, and a suitable parameter is considerable to whole crossroad controlling system of traffic light.Because extraneous light intensity is along with the variation of time changes, this will inevitably have influence on us and judge by frame difference method the accuracy of road pass blocking situation.So, fixing frame difference limen value be impossible assurance system reliability.Contrary, this threshold value must change and automatically regulate along with outside light.Certainly, all systematic parameters all can arrange by operator is manual, in any moment of system operation, operator can set gradually each systematic parameter by the input equipment of this cover system (matrix keyboard module 3), and the systematic parameter setting can be saved at once in electricallyerasable ROM (EEROM) (EEPROM) 2-2 of storage program digital machine and go.By the time systematic parameter ready after, storage program digital machine 2 starts to obtain crossroad information from camera 1-1 and ultrasonic wave module 1-3, these information is carried out together with systematic parameter to a series of logical operations (specifically providing in traffic congestion, unimpeded effective evaluation algorithm control program process flow diagram Fig. 7).The result of logical operation is exactly the state that crossroad traffic lights should keep.Storage program digital machine is just controlled traffic lights and is carried out corresponding state switching.
6. as shown in Figure 6, first camera 1-1 carries out after 100 frame samples an adaptive algorithm control program flow process of the present invention, takes out the brightness value of each frame and is averaging after cumulative.So just obtained now external environment condition average brightness value brightness, then at once judge that this brightness value is whether within a desirable scope, require the brightness value must be between our set systematic parameter TN(brightness value in night) and TA(brightness value at noon) between.And then definite TVAL(frame difference limen value), its algorithm is as follows: 1) if this mean value between TN(brightness value in night) and TM(brightness value in morning/afternoon) between, its threshold value is TVAL=average/2000; 2) if this mean value between TM(brightness value in morning/afternoon) and TA(brightness value at noon) between, its threshold value is TVAL=average/1000;
7. traffic congestion of the present invention, unimpeded effective evaluation algorithm control program flow process are as shown in Figure 7, first this part program can check that whether circular test number of times is to 0, if less than 0, proceed again traffic congestion, unimpeded effective judgement, and after having judged once, total cycle criterion number of times will be subtracted to 1, all logics of this algorithm comprise three kinds of situations:
1) road spaciousness, do not have car to pass through, now, between the luminance component of front and back two two field pictures that camera 1-1 obtains, almost there is no difference, after using frame difference algorithm to add up to the luminance component of two two field pictures, subtract each other, the value obtaining will inevitably be far smaller than picture frame difference limen value.Then, storage program digital machine 2 continues to read the distance value that ultrasonic wave module 1-3 records, because now pass through without any car on road, the measured value of ultrasonic wave module 1-3 must be exactly the antenna height of ultrasonic wave module 1-3 with respect to road surface.So now storage program digital machine 2 is controlled traffic lights module and is run well, between at regular intervals traffic lights force to switch.
2) road has car to pass through, but do not get congestion, now, the movement of getting off due to crossroad, the luminance component of front and back two two field pictures that camera 1-1 obtains certainly exists larger difference, after using frame difference method to add up to the luminance component of two two field pictures, subtract each other, the value obtaining will inevitably be greater than picture frame difference limen value.In this case, storage program digital machine 2 directly judges that crossroad wagon flow is unobstructed, any blocking up does not occur, and can not remove to read the distance measurement value of ultrasonic wave module 1-3.So now storage program digital machine 2 is controlled traffic lights module and is run well, between at regular intervals traffic lights carry out force handoff.
3) road has car to pass through, but occurred at the parting of the ways to block up, now, because the car below crossroad is slack, the luminance component of front and back two two field pictures that camera 1-1 obtains does not almost have difference, after using frame difference algorithm to add up to the luminance component of two two field pictures, subtract each other, the value obtaining is inevitable much smaller than picture frame difference limen value.Then, storage program digital machine 2 continues to read the distance value that ultrasonic wave module 1-3 records, because now place, crossroad has occurred to block up, the measured value of ultrasonic wave module 1-3 must be exactly the height that the height that sets up with respect to road surface of ultrasonic wave module deducts vehicle.So, now storage program digital machine 2 control traffic lights module force flash the redlight, forbid that each side's automobile always enters in crossroad, leaves the automobile being trapped in crossroad voluntarily.After traffic congestion disappears, the traffic lights of these crossroad all directions can return to normal at once.
The definite of traffic lights end-state adopted N judgement to get most algorithms, both avoided the generation of erroneous judgement, improved again the timely degree of traffic lights responses.
Claims (5)
1. an automatic cross crossroads traffic light control device, is characterized in that, device consists of input equipment-matrix keyboard module (3), output device (4), sensing equipment (1) and storage program digital machine (2),
1) described storage program digital machine (2) is for storing the needed parameter of this system, and process the information that all input equipments and sensing equipment gather, it by CPU (central processing unit) (CPU) (2-1), electricallyerasable ROM (EEROM) (EEPROM) (2-2), random-access memory (ram) (2-3), there is I, II, III, IV, the input/output port (I/O) of five ports of V (2-4) and flash memory (FLASH) (2-5) form, electricallyerasable ROM (EEROM) (EEPROM) (2-2), random-access memory (ram) (2-3), input/output port (I/O) (2-4) (2-5) (2-1) is connected with CPU (central processing unit) (CPU) respectively with flash memory (FLASH), CPU (central processing unit) (CPU) (2-1) by count/logical block (ALU) (2-1-1), control and timing circuit (2-1-3), random-access memory (ram) (2-1-2) forms, count/logical block (ALU) (2-1-1) (2-1-2) be connected the latter two with random access memory (RAM) and be connected with control and timing circuit (2-1-3) respectively,
Described output device (4) is for showing whole system parameter and whole system running status, LCD display module (4-1) and red green pilot lamp and control circuit module (4-2), consists of;
Described sensing equipment (1) is for obtaining the status information of monitored crossroad, and send storage program digital machine (2) to after these information are processed, by camera (1-1), video input, formed with decoding chip (1-2) and ultrasonic wave module (1-3);
2) camera (1-1) of described sensing equipment (1) is connected with decoding chip (1-2) with video input, video input is connected with the input port I of storage program digital machine (2) with decoding chip (1-2), and the ultrasonic wave module (1-3) of sensing equipment (1) is connected with the input port II of storage program digital machine (2); Matrix keyboard module (3) is connected with the input port III of storage program digital machine (2); The output port IV of storage program digital machine (2) is connected with the LCD display module (4-1) of output device (4), and the output port V of storage program digital machine (2) is connected with red green pilot lamp and the control circuit module (4-2) of output device (4).
2. a kind of automatic cross crossroads traffic light control device according to claim 1, it is characterized in that, described storage program digital machine is that the environment nowadays brightness gathering according to sensing equipment camera (1-1) carrys out dynamic calculation picture frame difference limen value.
3. a kind of automatic cross crossroads traffic light control device according to claim 1, it is characterized in that, described storage program digital machine (2) comprises a storage program digital machine, this storage program digital machine (2), except the program and crossroad state determining program of storage dynamic calculation picture frame difference limen value, also allows the further program of operation of storage.
4. a kind of automatic cross crossroads traffic light control device as claimed in claim 1, it is characterized in that, be the reliable lights state control providing, and improve the timely degree of the response of traffic lights simultaneously as far as possible, storage program digital machine (2) is carried out following steps
1) need to choose a suitable threshold value for image frame difference method, first, camera (1-1) carries out after 100 two field picture samplings, taking out the brightness value of each frame is averaging after cumulative, so just obtain now external environment condition average brightness value brightness, then according to average brightness value brightness and morning, noon and afternoon reference brightness value TM, TA, TN, calculated current image frame difference limen value;
2) improve the timely degree that traffic lights respond, avoided the generation of erroneous judgement, first the repeated sampling times N of the predefined anti-erroneous judgement of storage program digital machine (2) meeting read operation person, then carry out after each crossroad access state judgement, this repeated sampling number of times is subtracted to 1 operation, and judge that whether this value is to 0, if to 0, directly exit epicycle judgement, if be not 0, proceed to judge next time, until certain crossroad state has reached 3/4N, then, whether the vehicle height value of obtaining in conjunction with ultrasonic wave module (1-3) again decides this state effective.
5. the application of a kind of automatic cross crossroads traffic light control device as claimed in claim 1, it is characterized in that, when there is at the parting of the ways local obstruction, the traffic lights of all directions of this crossroad all sends out a warning, forbid that each side's automobile always enters in crossroad, just can make the automobile being trapped in crossroad leave voluntarily, thereby avoid for a long time serious traffic jam, after traffic congestion disappears, the traffic lights of these crossroad all directions can return to normal at once, to reach the object of alleviating the serious traffic jam in crossroad; After central processing unit CPU (2-1) has read the systematic parameter that electricallyerasable ROM (EEROM) (EEPROM) preserves in (2-2), system enters real crossroad traffic lights state of a control, now, camera (1-1) and ultrasonic wave module (1-3) have all been aimed at the overlapping region of crossroad, consider three kinds of situations below:
1) road spaciousness, do not have car to pass through, now, between the luminance component of front and back two two field pictures that camera 1-1 obtains, almost there is no difference, after using frame difference algorithm to add up to the luminance component of two two field pictures, subtract each other, the value obtaining will inevitably be far smaller than picture frame difference limen value, then, central processing unit CPU (2-1) continues to read the distance value that ultrasonic wave module (1-3) records, because now pass through without any car on road, the measured value of ultrasonic wave module (1-3) must be exactly the antenna height of ultrasonic wave module (1-3) with respect to road surface, so, now central processing unit CPU (2-1) is controlled red green pilot lamp and control circuit module (4-2) runs well, between, traffic lights are forced to switch at regular intervals,
2) road has car to pass through, but do not get congestion, now, the movement of getting off due to crossroad, the luminance component of front and back two two field pictures that camera (1-1) obtains certainly exists larger difference, after using frame difference method to add up to the luminance component of two two field pictures, subtract each other, the value obtaining will inevitably be greater than picture frame difference limen value, in this case, storage program digital machine (2) directly judges that crossroad wagon flow is unobstructed, there is not any blocking up, and can not remove to read the distance measurement value of ultrasonic wave module (1-3), so, now storage program digital machine (2) is controlled red green indicating lamp control circuit module (4-2) and is run well, between, traffic lights carry out force handoff at regular intervals,
3) road has car to pass through, but occurred at the parting of the ways to block up, now, because the car below crossroad is slack, the luminance component of front and back two two field pictures that camera (1-1) obtains does not almost have difference, after using frame difference algorithm to add up to the luminance component of two two field pictures, subtract each other, the value obtaining is inevitable much smaller than picture frame difference limen value, then, storage program digital machine (2) continues to read the distance value that ultrasonic wave module (1-3) records, because now place, crossroad has occurred to block up, the measured value of ultrasonic wave module (1-3) must be exactly the height that the height that sets up with respect to road surface of ultrasonic wave module (1-3) deducts vehicle, so, now storage program digital machine (2) is controlled red green pilot lamp and control module (4-2) and is forced to flash the redlight, forbid that each side's automobile always enters in crossroad, the automobile being trapped in crossroad is left voluntarily, after traffic congestion disappears, the traffic lights of these crossroad all directions can return to normal at once.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105206069A (en) * | 2015-10-29 | 2015-12-30 | 常州市规划设计院 | Road intersection traffic signal lamp intelligent control system |
| CN106097705A (en) * | 2015-12-08 | 2016-11-09 | 合肥寰景信息技术有限公司 | A kind of system of the magnitude of traffic flow threshold value calculating control traffic signaling equipment |
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| DE10142250A1 (en) * | 2001-08-29 | 2003-04-03 | Siemens Ag | Traffic flow control system, e.g. for control of traffic lights, is based on local collection and processing of traffic data for control of traffic within a limited range so that less complex hardware can be used |
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| CN105206069A (en) * | 2015-10-29 | 2015-12-30 | 常州市规划设计院 | Road intersection traffic signal lamp intelligent control system |
| CN105206069B (en) * | 2015-10-29 | 2017-10-13 | 常州市规划设计院 | A kind of intersection traffic signal light intelligent control system |
| CN106097705A (en) * | 2015-12-08 | 2016-11-09 | 合肥寰景信息技术有限公司 | A kind of system of the magnitude of traffic flow threshold value calculating control traffic signaling equipment |
| CN110111595A (en) * | 2019-06-14 | 2019-08-09 | 陈旻嗣 | Spare traffic signal control system and method |
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| CN103761882B (en) | 2016-04-27 |
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