CN107170254A - A kind of traffic lights self-adaptation control method and device - Google Patents
A kind of traffic lights self-adaptation control method and device Download PDFInfo
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Abstract
The embodiment of the present invention provides a kind of traffic lights self-adaptation control method and device, including：Obtain the phase type of each phase in intersection, and the initial duration of each green light of the phase in controlling cycle, the phase type includes coordinating phase and non-coordinating phase, at least include a coordination phase in each ring, coordinate the initial duration of green light that green light actual duration of the phase in a controlling cycle is more than or equal to the coordination phase；For a phase in intersection described in a controlling cycle, in during the green light of the phase, whether the position judgment in the barrier according to residing for the phase type of the phase, the magnitude of traffic flow of the phase and the phase are located at the phase carries out traffic control according to the initial duration of green light of the phase, if it is not, then carrying out traffic control according to the actual duration of green light of the phase.
Description
The application is a divisional application with the application number of 201510332420.4, the application date of 2015, 6 and 16 and the name of 'a traffic signal lamp self-adaptive control method and device'.
Technical Field
The invention relates to the technical field of traffic control, in particular to a self-adaptive control method and device for a traffic signal lamp.
Background
The existing urban traffic plays an important role in economic and social development, and particularly, the running efficiency of the urban traffic in the central area of the city is improved, so that huge economic and social benefits can be brought. The most common means of modern urban traffic control is traffic control through road traffic signal indicator lamps. The traffic control is carried out by utilizing the periodic cycle change of different colors (red, yellow and green) of the signal lamp, and the signal cycle is divided into different time periods according to different traffic flow characteristics, so that the traffic participants who conflict with each other are prevented from simultaneously obtaining the right of way in a certain time period, and the occurrence of traffic conflict is avoided. The signal control not only affects the traffic capacity of roads and the waiting time of vehicles, but also has indirect relation with the tail gas emission of vehicles, the fuel consumption, the noise pollution and the like.
In China, more than 80% of traffic lights at road intersections are in cable-free coordination control, namely, cable-free coordination control, and the method is one of main road coordination control modes. The cableless coordination is only to simply set a control period for the traffic signal lamp, and cannot adjust the control period of the traffic signal lamp in real time according to the actual condition of road traffic. Therefore, the embodiments of the present invention are directed to overcoming the disadvantages and shortcomings of the prior art, and providing a method for controlling traffic lights at intersections under different traffic flow conditions.
Disclosure of Invention
The embodiment of the invention provides a self-adaptive control method and a self-adaptive control device for traffic signal lamps, which are used for providing a control method for the traffic signal lamps suitable for different traffic flows.
The embodiment of the invention provides a self-adaptive control method of a traffic signal lamp, which comprises the following steps:
acquiring a phase type of each phase in a road intersection and an initial green light duration of each phase in a control period, wherein the phase type comprises a coordination phase and a non-coordination phase, each loop at least comprises one coordination phase, and the actual green light duration of the coordination phase in one control period is greater than or equal to the initial green light duration of the coordination phase;
and aiming at one phase in the intersection in one control cycle, judging whether to carry out traffic control according to the initial green light duration of the phase in the green light period of the phase according to the phase type of the phase, the traffic flow of the phase and the position of the phase in a barrier where the phase is positioned, and if not, carrying out traffic control according to the actual green light duration of the phase.
The embodiment of the invention provides a self-adaptive control device of a traffic signal lamp, which comprises:
the system comprises a determining unit, a judging unit and a control unit, wherein the determining unit is used for acquiring a phase type of each phase in a road intersection and an initial green light duration of each phase in a control period, the phase type comprises a coordination phase and a non-coordination phase, each loop at least comprises one coordination phase, and the actual green light duration of each coordination phase in one control period is greater than or equal to the initial green light duration of the coordination phase;
and the control unit is used for judging whether to carry out traffic control according to the initial green light time length of the phase according to the phase type of the phase, the traffic flow of the phase and the position of the phase in the barrier where the phase is positioned in the phase aiming at one phase in the road intersection in one control period, and carrying out traffic control according to the actual green light time length of the phase if not.
According to the method and the device provided by the embodiment of the invention, whether traffic control is carried out according to the initial duration of the green light of the phase is judged according to the phase type of the phase, the traffic flow of the phase and the position of the phase in the barrier where the phase is positioned, so that the self-adaptive control of the traffic signal lamp is realized according to the real-time traffic flow.
Drawings
Fig. 1 is a schematic view of a road intersection according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a phase release sequence according to an embodiment of the present invention;
fig. 3 is a flowchart of a self-adaptive control method for a traffic signal lamp according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a self-adaptive control process of a traffic signal lamp according to an embodiment of the present invention;
fig. 5 is a structural diagram of a self-adaptive control device of a traffic signal lamp according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the embodiment of the invention, when the road intersection controls the release of the traffic flow, the combination of a plurality of phase release sequences is called a ring, and the phase refers to the signal display state of one or more traffic flows which simultaneously obtain the right of way in the time length of one signal control cycle. A ring is cut into several segments, called barriers (barriers) for cutting the ring. There will be phases that are released simultaneously in different rings of the same barrier and the phases that are released simultaneously in different rings of the same barrier need to meet the barrier duration constraint, i.e. the green duration of the phases that are released simultaneously in different rings of the same barrier should be equal. Meanwhile, the duration of the green light of each ring in the intersection is the sum of the durations of the green lights of all the phases contained in the ring, and the durations of the green lights of each ring are equal and equal to the control period duration of the intersection.
It should be noted that, for the explanation of the ring, the phase and the barrier, reference may also be made to "GA 509-2004 city traffic signal control system terminology" issued by the ministry of public security, and the explanation is not repeated herein.
It should be noted that, in the embodiment of the present invention, the control period duration may also be referred to as a period duration, which is a sum of green light durations of each phase at a road intersection, and is hereinafter referred to as a control period duration.
For example, as shown in fig. 1, an intersection according to an embodiment of the present invention is schematically illustrated. In fig. 1, the road intersection is composed of an east-west road and a north-south road, and has 8 phases, which are P1, P2, P3, P4, P5, P6, P7, and P8. The road intersection releasing scheme comprises two rings, wherein the phase releasing sequences of the ring 1 are P1, P6, P7 and P4, and the phase releasing sequences of the ring 2 are P5, P2, P3 and P8.
Referring to fig. 1 and fig. 2, a phase release method according to an embodiment of the present invention is shownSchematic sequence diagram. In fig. 2, P1 and P6 are separated by barrier 1 because they conflict with P3 and P8 and cannot be released simultaneously; the conflicts of P5, P2, P7 and P4 cannot be released at the same time, and are divided by the barrier 2. Barrier 1 includes P1 and P6 in ring 1, P5 and P2 in ring 2; included within barrier 2 are P7 and P4 in ring 1, and P3 and P8 in ring 2. The duration of the green light of barrier 1 at this time is B1Comprises the following steps: b is1＝τ1+τ6Or barrier 1 green duration B1Comprises the following steps: b is1＝τ5+τ2(ii) a Green duration B of barrier 22Is B2＝τ7+τ4Or, the duration of green light of barrier 2 is B2Is B2＝τ3+τ8In which τ isiThe duration of the green light of the ith phase is, i is a positive integer. According to the above description, the green lamp durations of the different rings should be identical, i.e.: tau is1+τ6+τ7+τ4＝τ5+τ2+τ3+τ8. Meanwhile, the control period C of the intersection can also represent: c ═ τ1+τ6+τ7+τ4＝τ5+τ2+τ3+τ8＝B1+B2。
In the embodiment of the invention, the phase type in each loop is divided into the coordinated phase and the non-coordinated phase, and after the initial duration of the green light of each phase is determined, the traffic control is carried out according to the real-time traffic flow of each phase, so that the traffic control efficiency is improved. The details are described below.
As shown in fig. 3, a flow chart of a self-adaptive control method for a traffic signal lamp according to an embodiment of the present invention includes:
step 301: acquiring a phase type of each phase in a road intersection and an initial green light duration of each phase in a control period, wherein the phase type comprises a coordination phase and a non-coordination phase, each loop at least comprises one coordination phase, and the actual green light duration of the coordination phase in one control period is greater than or equal to the initial green light duration of the coordination phase;
step 302: and aiming at one phase in the intersection in one control cycle, judging whether to carry out traffic control according to the initial green light duration of the phase in the green light period of the phase according to the phase type of the phase, the traffic flow of the phase and the position of the phase in a barrier where the phase is positioned, and if not, carrying out traffic control according to the actual green light duration of the phase.
Before step 301, it is also necessary to determine the phase type of each phase at the intersection, and there may be various methods for determining the phase type of each phase at the intersection.
For example, one possible implementation is to set the phase of the main road at the intersection as the coordinated phase and the phase of the non-main road as the non-coordinated phase.
Alternatively, in order to make traffic signal light more effective in controlling traffic, the phase type of each phase may be determined according to the traffic intensity of each phase at the intersection.
For example, the traffic intensity of each phase of the intersection is determined; and then for one ring of the intersection, determining the N phases with the maximum traffic intensity in the ring as coordinated phases, and determining the phases except the N phases with the maximum traffic intensity in the ring as non-coordinated phases, wherein N is a positive integer greater than or equal to 1.
The traffic intensity of each phase of the intersection is determined according to the traffic flow of each phase. A traffic data detector may be provided in each phase of the intersection, and then the traffic flow of each phase is detected by the traffic data detector, and then the traffic intensity of each phase is determined. The traffic data detector may be a loop coil detector, a geomagnetic detector, a video detector, an ultrasonic detector, and the like, which is not limited in this embodiment of the present invention.
Alternatively, the traffic intensity Q of the ith phase may be calculated by the following formulai：
Wherein,is a preset weight value, and is a preset weight value,Lia traffic flow value for the ith phase of said intersection, detected by a traffic data detector arranged in the phase, SiA saturation traffic flow value, O, preset for the ith phase of the intersectioniThe time occupancy of the ith phase at the intersection,and presetting a saturation time occupancy rate for the ith phase of the road intersection.
In addition, in the formula (1)Can be set according to actual conditions.
The time occupancy is a ratio of time during which a vehicle is present in a detection section or detection area of a road to the total statistical time, and can be detected by a traffic data detector.
For example, the saturation traffic flow value S preset in the formula (1)iAnd a preset saturation time occupancyMay be obtained from the data detected by the traffic data detector, for example, by taking the maximum value of the detected traffic flow within a preset time period as a preset saturationAnd traffic flow, or taking the average value of the traffic flows detected every preset period as the preset saturated traffic flow. For another example, the maximum value of the detected time occupancy within the preset time period is taken as the preset saturation time occupancy, or the average value of the detected time occupancies every preset period is taken as the preset saturation time occupancy.
In order to accurately calculate the traffic intensity of each phase, a plurality of traffic data detectors may be disposed in one phase, a traffic intensity may be determined according to the traffic flow detected by each traffic data detector, and the maximum value of the determined traffic intensities may be used as the traffic intensity of the phase after weighting the determined traffic intensities.
The traffic intensity of each phase at the intersection can also be determined in other manners, which is not limited in the embodiments of the present invention and will not be described herein again.
The traffic intensity at a road intersection is obtained by adding up the traffic intensity at each phase of the road intersection. The traffic intensity at a road intersection can be determined by the following formula:
and I is the traffic intensity of the road intersection, and n is the number of phases contained in the road intersection.
Similarly, the traffic intensity of each ring can be obtained by accumulating the traffic intensities of the phases included in the ring; the traffic intensity of each barrier can be obtained by adding the traffic intensities of the phases included in the barrier.
After determining the phase type of each phase at the intersection, the phase type of each phase is obtained in step 301, and the green light initial time of each phase is determined.
There are various methods for determining the initial duration of green light for each phase, for example, one possible implementation is: the control cycle duration is equally assigned to each phase according to the number of phases.
For example, another possible implementation is: and determining the initial duration of the green light of each phase according to the traffic intensity of each phase of the road intersection.
Specifically, the method comprises the step one of determining the initial green light duration of each barrier of the intersection according to the proportion of the traffic intensity of each barrier of the intersection to the traffic intensity of the intersection. The green light initial time for each barrier in a pathway intersection may be calculated using the following formula:
wherein, TjThe initial duration of the green light of the jth barrier in the intersection, C the duration of the control period, IjIs the traffic intensity of the jth barrier, m is the number of barriers included at the intersection,indicating a ceiling operation.
Note that the rounding-up operation in the formula (3) may be a rounding-down operation.
And step two, aiming at one phase in the intersection, determining the initial green light duration of the phase in a control period according to the proportion of the traffic intensity of the phase occupying the traffic intensity accumulated sum of all phases which are in the same barrier and the same ring as the phase.
The green light initial period for each phase in the jth barrier may be calculated using the following equation:
wherein, TiIs the initial duration of green light for the ith phase, k is the number of phases in the same ring as the ith phase in the jth barrier,indicating a ceiling operation.
The rounding-up operation in the formula (4) may be a rounding-down operation.
It should be noted that the control period duration may be determined by various methods, which is not limited in this embodiment of the present invention and is not described herein again.
In step 302, the actual duration of the green light of the phase needs to be determined in real time according to the type of the phase of the determined phase, the traffic flow of the phase in the control cycle and the position of the phase in the barrier where the phase is located, and traffic control is performed according to the actual duration of the green light of the phase.
It should be noted that, in the embodiment of the present invention, the actual duration of the green light in the phase refers to the duration from the start to the end of the green light in the phase.
In the embodiment of the invention, the actual green light duration of the coordination phase in one control period is greater than or equal to the initial green light duration of the coordination phase; the actual duration of the green light in the non-coordinated phase in one control period may be less than, greater than or equal to the initial duration of the green light in the non-coordinated phase, which is determined according to actual conditions.
Optionally, the initial duration of the green light in the non-coordinated phase may be controlled, and when the traffic flow in the non-coordinated phase is less than or equal to the preset traffic flow, the green light in the non-coordinated phase is ended in advance, so as to reduce the idle duration of the green light.
Specifically, when the phase type of the phase is a non-coordinated phase, determining whether the traffic flow in the phase is greater than a preset traffic flow, if the traffic flow in the phase is less than or equal to the preset traffic flow, determining whether the phase is the last phase in the barrier where the phase is located, and if the phase is not the last phase in the barrier where the phase is located, ending the green light of the phase;
and if the traffic flow in the phase is less than or equal to the preset traffic flow and the phase is the last phase in the barrier where the phase is located, judging whether to finish the green light and the green light of the phase according to the phase which is in the same barrier with the phase and is released at the same time.
Specifically, whether to end the green light of the phase may be determined according to the phase that is in the same barrier as the phase and is released at the same time by:
judging whether a coordinated phase exists in the phase which is in the same barrier with the phase and is released simultaneously, if not, judging whether an uncoordinated phase with the traffic flow larger than the preset traffic flow exists in the phase which is in the same barrier with the phase and is released simultaneously, and if not, ending the green light of the phase; and if the phase is in the same barrier and simultaneously released phase, judging whether the green light in the same barrier and simultaneously released phase with the phase is finished, if so, finishing the green light in the phase, otherwise, finishing the green light in the phase when the green light in the same barrier and simultaneously released phase with the phase is finished.
Through the scheme described above, the green light with the traffic flow less than or equal to the preset traffic flow can be ended in advance, so that the resource waste is reduced, and the traffic pressure can be relieved more effectively.
It should be noted that the preset traffic flow may be set to 0 in general, so that when the traffic data detector determines that no traffic flow passes through the uncoordinated phase, the green light of the uncoordinated phase may be terminated early.
It should be noted that, when ending the green light of the phase in the embodiment of the present invention, before ending the green light of the phase, the blinking time duration may be the preset buffer time duration by controlling the green light to blink, so that a traffic accident caused by the sudden end of the green light may be avoided.
In order to avoid the change of the control cycle duration of the intersection caused by the early ending of the green light in the non-coordinated phase, the surplus time generated by the early ending of the green light in the non-coordinated phase needs to be added to the coordinated phase in the same ring with the non-coordinated phase, so as to ensure that the control cycle duration of the intersection is not changed as a whole.
Specifically, the balance time generated by the early end of the green light in the non-coordinated phase is added to the coordinated phase in the same ring with the non-coordinated phase through the following steps:
step one, determining the phase remaining time length of the phase, wherein the phase remaining time length of the phase is equal to the difference value between the initial green light time length and the actual green light time length of the phase;
step two, judging whether a phase which is in the same barrier with the phase and is behind the phase has a coordination phase, if so, turning to step three;
and step three, adding the phase balance duration of the phase to a first coordination phase which is in the same barrier with the phase and is positioned behind the phase, setting the phase balance duration of the phase to zero after adding the phase balance duration to the first coordination phase which is in the same barrier with the phase and is positioned behind the phase, otherwise, determining the barrier balance duration of the barrier in which the phase is positioned according to the phase balance duration of the phase, adding the barrier balance duration to the first coordination phase which is in the same ring with the phase and is positioned behind the phase, and setting the barrier balance duration to zero after adding the first coordination phase which is in the same ring with the phase and is positioned behind the phase.
In the third step, the barrier balance duration of the barrier in which the phase is located is determined by the following method:
firstly, the accumulation of the balance duration of all the uncoordinated phases in each ring in the barrier is used as the balance duration of the ring; and then, taking the minimum ring balance time length in all the ring balance time lengths in the barrier as the barrier balance time length of the barrier.
Therefore, the problem that in the same barrier, the barrier balance time has errors due to different ring balance time lengths of different rings can be avoided. For example, referring to fig. 1 and fig. 2, P1, P5, and P6 in barrier 1 are all non-coordinated phases, P2 is a coordinated phase, the initial duration of the green light of P1 is greater than the initial duration of the green light of P5, in a control cycle duration, the green light of P1 ends in advance and ends at the same time with P5, at this time, the phase balance duration of P1 is a, a is greater than 0, the phase balance durations of P6 and P2 are both 0, the ring balance duration of the ring in which P1 and P6 are located is a, the ring balance duration of the ring in which P2 and P5 are located is 0, and then the balance duration of barrier 1 is 0. Since P6 is the last phase in barrier 1, and it is determined whether P2 released simultaneously with the end of the green light is ended before the end of the green light, only when the green light of P2 is ended, the green light of P6 can be ended, resulting in that the actual duration of the green light of P6 is greater than the initial duration of the green light of P6, therefore, although the loop-tie remaining duration of the loop in which P1 and P6 are located is a, the remaining duration of the loop-tie remaining duration of the loop in which P6 is located is passively extended, and is offset from the phase-tie remaining duration of P1, the barrier remaining duration of barrier 1 should be the loop-tie remaining duration of the loop in which P2 and P5 are located, i.e. 0.
In the above scheme, if the phase type of the phase is the coordination phase, before the phase green light is turned on, the initial duration of the green light of the phase is increased, the increased duration is the sum of the phase balance duration before the phase and the barrier balance duration before the phase, the sum of the phase balance duration before the phase and the barrier balance duration before the phase may be zero, and the traffic of the phase is controlled according to the increased duration. For example, referring to fig. 1 and fig. 2, P1, P2, and P6 in barrier 1 are all non-coordinated phases, and P5 is a coordinated phase; p7, P3 and P8 in the barrier 2 are all non-coordinated phases, and P4 is a coordinated phase. The initial duration of green light of P1 is longer than that of P5. In a control period, the barrier balance duration of the barrier 1 is A, A is greater than 0, the green light of P7 in the barrier 2 is ended in advance, the phase balance duration of P7 is B, B is greater than 0, at this time, before the green light of P4 starts, the barrier balance duration before the phase is determined to be A, the phase balance duration before the phase is B, and then the actual duration of the green light of P4 is at least the sum of the initial duration of the green light of the phase and A and B.
Similarly, in order to ensure that the total duration of the control cycle at the intersection is unchanged, when the last phase in the barrier is the coordination phase, whether the coordination phase is released simultaneously with the coordination phase needs to be judged, and traffic control is performed according to the coordination phase released simultaneously with the coordination phase.
Specifically, if the phase type of the phase is a coordination phase, and the phase is the last phase in the barrier where the phase is located, whether the green light of the coordination phase in the phase which is in the same barrier and released simultaneously with the phase is finished is judged, if yes, the green light of the phase is finished, otherwise, the green light of the phase is finished when the green light of the coordination phase in the phase which is in the same barrier and released simultaneously with the phase is finished.
The above method is described below by a specific example.
As shown in fig. 4, an embodiment of the present invention provides a schematic diagram of an adaptive control process of a traffic signal lamp.
Step 401, before turning on the green light, judging whether the current released phase is a coordination phase, if so, turning to step 402, otherwise, turning to step 407;
step 402, increasing the initial duration of the green light of the phase;
the added duration is the sum of the phase balance duration before the phase and the barrier balance duration before the phase, and the sum of the phase balance duration before the phase and the barrier balance duration before the phase is set to be zero;
step 403, when the phase is released, determining whether the initial duration of the green light after the phase is increased is over, if yes, going to step 404;
step 404, determining whether the phase is the last phase in the barrier where the phase is located, if yes, going to step 405, otherwise going to step 406;
step 405, judging whether the green light of the coordination phase in the phase which is in the same barrier and released simultaneously with the phase is finished, if so, finishing the green light of the phase, otherwise, finishing the green light of the phase when the green light of the coordination phase in the phase which is in the same barrier and released simultaneously with the phase is finished, and turning to step 406;
step 406, starting the next phase release, and going to step 401;
step 407, judging whether the traffic flow in the phase is greater than a preset traffic flow, if not, turning to step 408;
step 408, judging whether the phase is the last phase in the barrier where the phase is located, if not, turning to step 409, otherwise, turning to step 410;
step 409, ending the phase green light, determining the phase remaining time of the phase, and turning to step 406;
step 410, determining whether there is a coordination phase in the phases that are in the same barrier and simultaneously released with the phase, if yes, going to step 411, otherwise going to step 412;
step 411, determining whether the green light of the phase in the same barrier and simultaneously released coordination phase is finished, if yes, finishing the green light of the phase, otherwise, finishing the green light of the phase when the green light of the phase in the same barrier and simultaneously released coordination phase is finished, and going to step 413;
step 412, judging whether a non-coordinated phase with the traffic flow larger than the preset traffic flow exists in the phase which is in the same barrier with the phase and is released simultaneously, if not, ending the green light of the phase, and turning to step 413;
in step 413, the barrier balance duration of the barrier in which the phase is located is determined, and the process goes to step 406.
For the above method flow, an embodiment of the present invention further provides a traffic signal light adaptive control device, and specific contents of the device may be implemented with reference to the above method, which is not described herein again.
As shown in fig. 5, an adaptive control device for a traffic signal lamp according to an embodiment of the present invention includes:
a determining unit 501, configured to obtain a phase type of each phase at a road intersection and an initial green light duration of each phase in a control period, where the phase type includes a coordinated phase and a non-coordinated phase, each loop includes at least one coordinated phase, and an actual green light duration of each coordinated phase in one control period is greater than or equal to the initial green light duration of each coordinated phase;
a control unit 502, configured to, for a phase in the intersection in a control cycle, determine, in a green light period of the phase, whether to perform traffic control according to an initial green light duration of the phase according to a phase type of the phase, a traffic flow of the phase, and a position of the phase in a barrier in which the phase is located, and if not, perform traffic control according to an actual green light duration of the phase.
Preferably, the determining unit 501 is further configured to:
determining traffic intensity of each phase of the intersection;
and aiming at one ring of the road intersection, determining N phases with the maximum traffic intensity in the ring as coordinated phases, and determining the phases except the N phases with the maximum traffic intensity in the ring as non-coordinated phases, wherein N is a positive integer greater than or equal to 1.
Preferably, the determining unit 501 is specifically configured to:
determining the initial green light duration of each barrier of the intersection according to the proportion of the traffic intensity of each barrier of the intersection to the traffic intensity of the intersection;
and aiming at one phase in the intersection, determining the initial green light duration of the phase in a control period according to the proportion of the traffic intensity of the phase occupying the traffic intensity accumulated sum of all phases which are in the same barrier and the same ring with the phase.
Preferably, the control unit 502 is specifically configured to:
when the phase type of the phase is a non-coordinated phase, judging whether the traffic flow in the phase is greater than a preset traffic flow, if the traffic flow in the phase is less than or equal to the preset traffic flow, judging whether the phase is the last phase in a barrier where the phase is located, and if the phase is not the last phase in the barrier where the phase is located, ending the green light of the phase;
and if the traffic flow in the phase is less than or equal to the preset traffic flow and the phase is the last phase in the barrier where the phase is located, judging whether to finish the green light and the green light of the phase according to the phase which is in the same barrier with the phase and is released at the same time.
Preferably, the control unit 502 is specifically configured to:
judging whether a coordinated phase exists in the phase which is in the same barrier with the phase and is released simultaneously, if not, judging whether an uncoordinated phase with the traffic flow larger than the preset traffic flow exists in the phase which is in the same barrier with the phase and is released simultaneously, and if not, ending the green light of the phase; and if the phase is in the same barrier and simultaneously released phase, judging whether the green light in the same barrier and simultaneously released phase with the phase is finished, if so, finishing the green light in the phase, otherwise, finishing the green light in the phase when the green light in the same barrier and simultaneously released phase with the phase is finished.
Preferably, the control unit 502 is further configured to:
determining the phase remaining time length of the phase, wherein the phase remaining time length of the phase is equal to the difference value between the initial green light time length and the actual green light time length of the phase;
and judging whether a coordinated phase exists in the phases which are in the same barrier with the phase and are positioned behind the phase, if so, increasing the phase balance time length of the phase to the first coordinated phase which is in the same barrier with the phase and is positioned behind the phase, and setting the phase balance time length of the phase to zero after being increased to the first coordinated phase which is in the same barrier with the phase and is positioned behind the phase, otherwise, determining the barrier balance time length of the barrier in which the phase is positioned according to the phase balance time length of the phase, increasing the barrier balance time length to the first coordinated phase which is in the same loop with the phase and is positioned behind the phase, and setting the barrier balance time length to zero after being increased to the first coordinated phase which is in the same loop with the phase and is positioned behind the phase.
Preferably, the control unit 502 is further configured to:
if the phase type of the phase is a coordination phase, and the phase is the last phase in the barrier where the phase is located, judging whether the green light of the coordination phase in the phase which is in the same barrier and released simultaneously with the phase is finished, if so, finishing the green light of the phase, otherwise, finishing the green light of the phase when the green light of the coordination phase in the phase which is in the same barrier and released simultaneously with the phase is finished.
Preferably, the control unit 502 is specifically configured to:
taking the accumulation of the balance duration of all the non-coordinated phases in the barrier in each ring as the ring balance duration;
and taking the minimum ring balance time length in all the ring balance time lengths in the barrier as the barrier balance time length of the barrier.
In summary, according to the method and the apparatus provided by the embodiment of the present invention, it is determined whether to perform traffic control according to the initial duration of the green light of the phase according to the phase type of the phase, the traffic flow of the phase, and the position of the phase in the barrier where the phase is located. In the period of green light, the non-coordinated phase can finish the green light in advance when the traffic flow of the phase is not more than the preset traffic flow, and the remaining phase time length is added to the first coordinated phase behind the phase, so that the self-adaptive regulation of the traffic signal light is realized, meanwhile, the control period time length of the traffic signal light can be kept unchanged on the whole, and the self-adaptive control of the traffic signal light according to the real-time traffic flow is realized.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (12)
1. A self-adaptive control method for a traffic signal lamp is characterized by comprising the following steps:
acquiring a phase type of each phase in a road intersection and an initial green light duration of each phase in a control period, wherein the phase type comprises a coordination phase and a non-coordination phase, each loop at least comprises one coordination phase, and the actual green light duration of the coordination phase in one control period is greater than or equal to the initial green light duration of the coordination phase; wherein the phase type of each phase is determined according to the traffic intensity of each phase at the intersection;
aiming at one phase in the intersection in one control period, judging whether to carry out traffic control according to the initial green light duration of the phase in the green light period of the phase according to the phase type of the phase, the traffic flow of the phase and the position of the phase in a barrier where the phase is located, and if not, carrying out traffic control according to the actual green light duration of the phase; specifically, when the phase type of the phase is a non-coordinated phase, determining whether the traffic flow in the phase is greater than a preset traffic flow, if the traffic flow in the phase is less than or equal to the preset traffic flow, determining whether the phase is the last phase in the barrier where the phase is located, and if the phase is not the last phase in the barrier where the phase is located, ending the green light of the phase; and if the traffic flow in the phase is less than or equal to the preset traffic flow and the phase is the last phase in the barrier where the phase is located, judging whether to finish the green light of the phase according to the phase which is in the same barrier with the phase and is released at the same time.
2. The method of claim 1, wherein the initial duration of green light in the control period for each phase is determined according to:
determining the initial green light duration of each barrier of the intersection according to the proportion of the traffic intensity of each barrier of the intersection to the traffic intensity of the intersection;
and aiming at one phase in the intersection, determining the initial green light duration of the phase in a control period according to the proportion of the traffic intensity of the phase occupying the traffic intensity accumulated sum of all phases which are in the same barrier and the same ring with the phase.
3. The method of claim 1, wherein determining whether to end the phase of green light and green light based on the phase being in the same barrier as the phase and passing at the same time comprises:
judging whether a coordinated phase exists in the phase which is in the same barrier with the phase and is released simultaneously, if not, judging whether an uncoordinated phase with the traffic flow larger than the preset traffic flow exists in the phase which is in the same barrier with the phase and is released simultaneously, and if not, ending the green light of the phase; and if the phase is in the same barrier and simultaneously released phase, judging whether the green light in the same barrier and simultaneously released phase with the phase is finished, if so, finishing the green light in the phase, otherwise, finishing the green light in the phase when the green light in the same barrier and simultaneously released phase with the phase is finished.
4. The method of claim 1 or 3, wherein after ending the green light for the phase, further comprising:
determining the phase remaining time length of the phase, wherein the phase remaining time length of the phase is equal to the difference value between the initial green light time length and the actual green light time length of the phase;
judging whether a coordinated phase exists in the phases which are in the same barrier with the phase and are positioned behind the phase, if so, adding the phase balance time length of the phase to the first coordinated phase which is in the same barrier with the phase and is positioned behind the phase, and setting the phase balance time length of the phase to zero after adding the phase balance time length to the first coordinated phase which is in the same barrier with the phase and is positioned behind the phase; otherwise, determining the barrier balance duration of the barrier where the phase is located according to the phase balance duration of the phase, adding the barrier balance duration to the first coordination phase which is in the same ring with the phase and is located behind the phase, and adding the barrier balance duration to the first coordination phase which is in the same ring with the phase and is located behind the phase and then setting the barrier balance duration to be zero.
5. The method of claim 1, further comprising:
if the phase type of the phase is a coordination phase, and the phase is the last phase in the barrier where the phase is located, judging whether the green light of the coordination phase in the phase which is in the same barrier and released simultaneously with the phase is finished, if so, finishing the green light of the phase, otherwise, finishing the green light of the phase when the green light of the coordination phase in the phase which is in the same barrier and released simultaneously with the phase is finished.
6. The method of claim 4, wherein the determining a barrier balance duration for the barrier in which the phase is located according to the phase balance duration for the phase comprises:
taking the accumulation of the balance duration of all the non-coordinated phases in the barrier in each ring as the ring balance duration;
and taking the minimum ring balance time length in all the ring balance time lengths in the barrier as the barrier balance time length of the barrier.
7. A traffic signal adaptive control apparatus, comprising:
the system comprises a determining unit, a judging unit and a control unit, wherein the determining unit is used for acquiring a phase type of each phase in a road intersection and an initial green light duration of each phase in a control period, the phase type comprises a coordination phase and a non-coordination phase, each loop at least comprises one coordination phase, and the actual green light duration of each coordination phase in one control period is greater than or equal to the initial green light duration of the coordination phase; wherein the phase type of each phase is determined according to the traffic intensity of each phase at the intersection;
the control unit is used for judging whether to carry out traffic control according to the initial green light time length of the phase according to the phase type of the phase, the traffic flow of the phase and the position of the phase in a barrier where the phase is located in the phase aiming at one phase in the road intersection in one control period, and if not, carrying out traffic control according to the actual green light time length of the phase; specifically, when the phase type of the phase is a non-coordinated phase, determining whether the traffic flow in the phase is greater than a preset traffic flow, if the traffic flow in the phase is less than or equal to the preset traffic flow, determining whether the phase is the last phase in the barrier where the phase is located, and if the phase is not the last phase in the barrier where the phase is located, ending the green light of the phase; and if the traffic flow in the phase is less than or equal to the preset traffic flow and the phase is the last phase in the barrier where the phase is located, judging whether to finish the green light and the green light of the phase according to the phase which is in the same barrier with the phase and is released at the same time.
8. The apparatus of claim 7, wherein the determination unit is specifically configured to:
determining the initial green light duration of each barrier of the intersection according to the proportion of the traffic intensity of each barrier of the intersection to the traffic intensity of the intersection;
and aiming at one phase in the intersection, determining the initial green light duration of the phase in a control period according to the proportion of the traffic intensity of the phase occupying the traffic intensity accumulated sum of all phases which are in the same barrier and the same ring with the phase.
9. The apparatus of claim 7, wherein the control unit is specifically configured to:
judging whether a coordinated phase exists in the phase which is in the same barrier with the phase and is released simultaneously, if not, judging whether an uncoordinated phase with the traffic flow larger than the preset traffic flow exists in the phase which is in the same barrier with the phase and is released simultaneously, and if not, ending the green light of the phase; and if the phase is in the same barrier and simultaneously released phase, judging whether the green light in the same barrier and simultaneously released phase with the phase is finished, if so, finishing the green light in the phase, otherwise, finishing the green light in the phase when the green light in the same barrier and simultaneously released phase with the phase is finished.
10. The apparatus of claim 7 or 9, wherein the control unit is further configured to:
determining the phase remaining time length of the phase, wherein the phase remaining time length of the phase is equal to the difference value between the initial green light time length and the actual green light time length of the phase;
judging whether a coordinated phase exists in the phases which are in the same barrier with the phase and are positioned behind the phase, if so, adding the phase balance time length of the phase to the first coordinated phase which is in the same barrier with the phase and is positioned behind the phase, and setting the phase balance time length of the phase to zero after adding the phase balance time length to the first coordinated phase which is in the same barrier with the phase and is positioned behind the phase; otherwise, determining the barrier balance duration of the barrier where the phase is located according to the phase balance duration of the phase, adding the barrier balance duration to the first coordination phase which is in the same ring with the phase and is located behind the phase, and adding the barrier balance duration to the first coordination phase which is in the same ring with the phase and is located behind the phase and then setting the barrier balance duration to be zero.
11. The apparatus of claim 7, wherein the control unit is further to:
if the phase type of the phase is a coordination phase, and the phase is the last phase in the barrier where the phase is located, judging whether the green light of the coordination phase in the phase which is in the same barrier and released simultaneously with the phase is finished, if so, finishing the green light of the phase, otherwise, finishing the green light of the phase when the green light of the coordination phase in the phase which is in the same barrier and released simultaneously with the phase is finished.
12. The apparatus as claimed in claim 10, wherein said control unit is specifically configured to:
taking the accumulation of the balance duration of all the non-coordinated phases in the barrier in each ring as the ring balance duration;
and taking the minimum ring balance time length in all the ring balance time lengths in the barrier as the barrier balance time length of the barrier.
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| CN104933874A (en) | 2015-09-23 |
| CN104933874B (en) | 2017-08-25 |
| CN107170254B (en) | 2019-09-17 |
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