CN111445707A - Timing method and device of traffic signal lamp, electronic equipment and storage medium - Google Patents

Timing method and device of traffic signal lamp, electronic equipment and storage medium Download PDF

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CN111445707A
CN111445707A CN201911159021.7A CN201911159021A CN111445707A CN 111445707 A CN111445707 A CN 111445707A CN 201911159021 A CN201911159021 A CN 201911159021A CN 111445707 A CN111445707 A CN 111445707A
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period
time
duration
predicted
timing
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CN111445707B (en
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王鲁晗
路兆铭
温向明
傅彬
王刚
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/07—Controlling traffic signals
    • G08G1/08—Controlling traffic signals according to detected number or speed of vehicles
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/07—Controlling traffic signals
    • G08G1/081—Plural intersections under common control

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Abstract

The embodiment of the disclosure discloses a time distribution method, a time distribution device, electronic equipment and a storage medium of a traffic signal lamp. The technical scheme can improve the real-time performance of the traffic signal lamp timing.

Description

Timing method and device of traffic signal lamp, electronic equipment and storage medium
Technical Field
The disclosure relates to the technical field of road safety, in particular to a time distribution method and device of a traffic signal lamp, electronic equipment and a storage medium.
Background
With the rapid development of economy, the number of vehicles running on roads is increasing, and great pressure is brought to the roads. The traffic signal lamp is used as an important traffic facility for traffic management, and the reasonable setting of the timing scheme of the traffic signal lamp plays a crucial role in road traffic operation. The existing traffic signal lamp usually adopts a timing scheme of fixed timing, namely the display duration of red light and green light is a fixed numerical value, and the existing traffic signal lamp can not adapt to increasingly busy traffic conditions gradually, so that the traffic at an intersection is more disordered and the traffic jam is more serious.
Disclosure of Invention
In order to solve the problems in the related art, embodiments of the present disclosure provide a timing method and apparatus for a traffic signal lamp, an electronic device, and a readable storage medium.
In a first aspect, the disclosed embodiments provide a timing method for a traffic signal lamp.
Specifically, the timing method of the traffic signal lamp comprises the following steps:
acquiring traffic data of a reference stage to determine a first timing duration;
acquiring the number of queued vehicles in a period of waiting for timing to determine a second timing duration;
and determining the time-distribution time length of the period to be distributed based on the first time-distribution time length and the second time-distribution time length so as to display the traffic signal lamp according to the time-distribution time length.
Optionally, the obtaining the traffic data of the reference phase to determine the first timing duration includes:
acquiring the reference traffic flow of the reference stage to determine the predicted traffic flow of the waiting time stage;
and acquiring the average headway of the reference stage, and determining the first timing duration based on the predicted traffic flow.
Optionally, the waiting time period is the ith period of the K +1 th period, the reference period includes the ith period of the kth period and the ith period of the K-1 th period, where K and i are positive integers and K is greater than or equal to 2, and the obtaining of the reference traffic flow of the reference period to determine the predicted traffic flow of the waiting time period includes:
acquiring the actual traffic flow V of the ith stage of the K-1 periodK-1And predicted deviation value △k-1And actual vehicle flow V of i stage of K cycleKAnd predicted deviation value △kThe prediction deviation value is the difference value between the predicted traffic flow and the actual traffic flow corresponding to the stage;
based on the predicted deviation value △k-1And △kAnd determining a prediction parameter kg:
Figure BDA0002285560340000021
based on the predicted parameter kg and the actual traffic flow VK-1And VKDetermining the predicted vehicle flow V 'of the ith stage of the K +1 period'K+1：
V′K+1＝VK-1+kg*(VK-VK-1)。
Optionally, the obtaining the average headway of the reference phase and determining the first timing duration based on the predicted traffic flow includes:
acquiring the average headway of the reference stage;
determining a first green light duration based on the headway and the predicted traffic flow;
and determining the time-distribution time length of the time-distribution period based on the first green light time length.
Optionally, the determining the time-dispensing duration of the to-be-dispensed time phase based on the first time-dispensing duration and the second time-dispensing duration includes:
determining weights corresponding to the first time-matching duration and the second time-matching duration;
and determining the time-distribution duration of the time-distribution period based on the weight.
In a second aspect, the disclosed embodiments provide a timing device for a traffic signal lamp.
Specifically, the timing device of the traffic signal lamp comprises:
the first acquisition module is configured to acquire the traffic data of the reference stage to determine a first timing duration;
the second acquisition module is configured to acquire the number of queued vehicles in the period of waiting for timing so as to determine a second timing duration;
and the time distribution module is configured to determine the time distribution duration of the time distribution period to be distributed based on the first time distribution duration and the second time distribution duration so that the traffic signal lamp is displayed according to the time distribution duration.
Optionally, the obtaining the traffic data of the reference phase to determine the first timing duration includes:
acquiring the reference traffic flow of the reference stage to determine the predicted traffic flow of the waiting time stage;
and acquiring the average headway of the reference stage, and determining the first timing duration based on the predicted traffic flow.
Optionally, the waiting time period is the ith period of the K +1 th period, and the reference period includes the ith period of the K-th period and the ith period of the K-1 th period, where K and i are positive integers and K is greater than or equal to 2, where the obtaining of the reference traffic flow of the reference period to determine the predicted traffic flow of the waiting time period includes:
acquiring the actual traffic flow V of the ith stage of the K-1 periodK-1And predicted deviation value △k-1And actual vehicle flow V of i stage of K cycleKAnd predicted deviation value △kThe prediction deviation value is the difference value between the predicted traffic flow and the actual traffic flow corresponding to the stage;
based on the predicted deviation value △k-1And △kAnd determining a prediction parameter kg:
Figure BDA0002285560340000031
based on the predicted parameter kg and the actual traffic flow VK-1And VKDetermining the predicted vehicle flow V 'of the ith stage of the K +1 period'K+1：
V′K+1＝VK-1+kg*(VK-VK-1)。
Optionally, the obtaining the average headway of the reference phase and determining the first timing duration based on the predicted traffic flow includes:
acquiring the average headway of the reference stage;
determining a first green light duration based on the headway and the predicted traffic flow;
and determining the time-distribution time length of the time-distribution period based on the first green light time length.
Optionally, the determining the time-dispensing duration of the to-be-dispensed time phase based on the first time-dispensing duration and the second time-dispensing duration includes:
determining weights corresponding to the first time-matching duration and the second time-matching duration;
and determining the time-distribution duration of the time-distribution period based on the weight.
In a third aspect, an embodiment of the present disclosure provides an electronic device, including a memory and a processor; wherein the memory is to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to implement the method steps of:
acquiring traffic data of a reference stage to determine a first timing duration;
acquiring the number of queued vehicles in a period of waiting for timing to determine a second timing duration;
and determining the time-matching duration of the time-matching period based on the first time-matching duration and the second time-matching duration.
Optionally, the obtaining the traffic data of the reference phase to determine the first timing duration includes:
acquiring the reference traffic flow of the reference stage to determine the predicted traffic flow of the waiting time stage;
and acquiring the average headway of the reference stage, and determining the first timing duration based on the predicted traffic flow.
Optionally, the waiting time period is the ith period of the K +1 th period, and the reference period includes the ith period of the K-th period and the ith period of the K-1 th period, where K and i are positive integers and K is greater than or equal to 2, where the obtaining of the reference traffic flow of the reference period to determine the predicted traffic flow of the waiting time period includes:
acquiring the actual traffic flow V of the ith stage of the K-1 periodK-1And predicted deviation value △k-1And actual vehicle flow V of i stage of K cycleKAnd predicted deviation value △kThe prediction deviation value is the difference value between the predicted traffic flow and the actual traffic flow corresponding to the stage;
based on the predicted deviation value △k-1And △kAnd determining a prediction parameter kg:
Figure BDA0002285560340000041
based on the predicted parameter kg and the actual traffic flow VK-1And VKDetermining the predicted vehicle flow V 'of the ith stage of the K +1 period'K+1：
V′K+1＝VK-1+kg*(VK-VK-1)。
Optionally, the obtaining the average headway of the reference phase and determining the first timing duration based on the predicted traffic flow includes:
acquiring the average headway of the reference stage;
determining a first green light duration based on the headway and the predicted traffic flow;
and determining the time-distribution time length of the time-distribution period based on the first green light time length.
Optionally, the determining the time-dispensing duration of the to-be-dispensed time phase based on the first time-dispensing duration and the second time-dispensing duration includes:
determining weights corresponding to the first time-matching duration and the second time-matching duration;
and determining the time-distribution duration of the time-distribution period based on the weight.
In a fourth aspect, an embodiment of the present disclosure provides a readable storage medium, on which computer instructions are stored, and when executed by a processor, the computer instructions implement the method according to any one of the implementation manners of the first aspect.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
according to the technical scheme provided by the embodiment of the disclosure, when the time-distribution time length of the time-distribution period is determined, on one hand, the first time-distribution time length is determined according to the traffic data of the reference period, and on the other hand, the second time-distribution time length is determined according to the number of the queued vehicles in the time-distribution period, so that the time-distribution time length of the time-distribution period determined based on the first time-distribution time length and the second time-distribution time length not only takes the historical data into consideration to improve the stability of the time-distribution time length, but also takes the real-time data into consideration to improve the flexibility of the time-distribution time length, thereby displaying the traffic signal lamp according to the time-distribution time length.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
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Other labels, objects and advantages of the present disclosure will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:
fig. 1A illustrates an application scenario of a timing method, an apparatus, an electronic device and a readable storage medium of a traffic signal according to an embodiment of the present disclosure;
fig. 1B illustrates an application scenario of a timing method, an apparatus, an electronic device and a readable storage medium of a traffic signal according to another embodiment of the present disclosure;
FIG. 2 illustrates a flow chart of a method of timing traffic lights according to an embodiment of the present disclosure;
FIG. 3 illustrates a flow chart for determining a first timed duration from traffic data according to an embodiment of the present disclosure;
FIG. 4 illustrates a flow chart for determining a predicted traffic flow in accordance with an embodiment of the present disclosure;
FIG. 5 illustrates a flow chart for determining a first timing duration based on an average headway in accordance with an embodiment of the present disclosure;
FIG. 6 illustrates a flow chart for determining a timing duration in accordance with an embodiment of the present disclosure;
fig. 7 shows a block diagram of a timing apparatus of a traffic signal according to an embodiment of the present disclosure;
FIG. 8 shows a block diagram of an electronic device according to an embodiment of the present disclosure;
FIG. 9 illustrates a schematic block diagram of a computer system suitable for use in implementing a timing method for a traffic signal according to an embodiment of the present disclosure.
Detailed Description
Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement them. Also, for the sake of clarity, parts not relevant to the description of the exemplary embodiments are omitted in the drawings.
In the present disclosure, it is to be understood that terms such as "including" or "having," etc., are intended to indicate the presence of the disclosed features, numbers, steps, behaviors, components, parts, or combinations thereof, and are not intended to preclude the possibility that one or more other features, numbers, steps, behaviors, components, parts, or combinations thereof may be present or added.
It should be further noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As mentioned above, with the rapid development of economy, the number of vehicles traveling on roads is increasing, and enormous pressure is placed on the roads. The traffic signal lamp is used as an important traffic facility for traffic management, and the reasonable setting of the timing scheme of the traffic signal lamp plays a crucial role in road traffic operation. The existing traffic signal lamp usually adopts a timing scheme of fixed timing, namely the display duration of red light and green light is a fixed numerical value, and the existing traffic signal lamp can not adapt to increasingly busy traffic conditions gradually, so that the traffic at an intersection is more disordered and the traffic jam is more serious.
In view of the above drawbacks, in an embodiment of the present disclosure, a timing method for a traffic signal lamp is provided, which includes obtaining traffic data in a reference phase to determine a first timing duration, obtaining a number of queued vehicles in a pending timing phase to determine a second timing duration, and determining a timing duration in the pending timing phase based on the first timing duration and the second timing duration, so that the traffic signal lamp is displayed according to the timing duration.
The embodiment of the disclosure can determine the time-sharing duration of the time-sharing period, on one hand, the first time-sharing duration is determined according to the traffic data of the reference period, on the other hand, the second time-sharing duration is determined according to the number of queued vehicles of the time-sharing period, so that the time-sharing duration of the time-sharing period determined based on the first time-sharing duration and the second time-sharing duration not only considers the historical data to improve the stability of the time-sharing duration, but also considers the real-time data to improve the flexibility of the time-sharing duration, thereby enabling the traffic signal lamp to be displayed according to the time-sharing duration to be more reasonable and real-time, and being beneficial to reducing road pressure.
Fig. 1A illustrates an application scenario of a timing method, an apparatus, an electronic device and a readable storage medium of a traffic signal according to an embodiment of the disclosure.
As shown in fig. 1A, a traffic signal lamp may be applied to an intersection 200 of roads for vehicle driving according to an embodiment of the present disclosure.
Traffic lights 101, 102, 103 and 104 set the four directions of the intersection 200, respectively, to direct traffic movement on phases 201, 202, 203 and 204, and can interact with local authorities 300 over a network to receive or send messages. The phase refers to the driving direction which is provided with a traffic signal lamp and is guided by the traffic signal lamp. The vehicle may travel along any of phases 201, 202, 203, and 204 on the road and pass through the intersection 200.
According to embodiments of the present disclosure, the traffic signals of the relative phases typically display the same color signal. For example, traffic lights 101 and 103 (or traffic lights 102 and 104) typically display the same color.
According to an embodiment of the present disclosure, at most one of the traffic signal lights not in the relative phase is displayed as a green light. For example, at most one of the traffic lights 101 and 102 (or the traffic lights 102 and 103, or the traffic lights 103 and 104, or the traffic lights 101 and 104) is displayed as a green light, that is, when the traffic light 101 (and 103) is displayed as a green light, the traffic light 102 (and 104) is displayed as a red light, and when the traffic light 102 (and 104) is displayed as a green light, the traffic light 101 (and 103) is displayed as a red light.
According to the embodiment of the disclosure, the period of the traffic signal lamp is a time period between the starting time of the time when the traffic signal lamp displays green and the ending time of the time when the traffic signal lamp displays green again, and the traffic signal lamp of each phase displays green once in one period. For example, the period of the signal light at the intersection in fig. 1A includes the sum of the period of time of the phase corresponding to the green light displayed by the traffic light 101 (or 103) and the period of time of the phase corresponding to the green light displayed by the traffic light 102 (or 104).
The local entity 300 may be a server, and may acquire road information (for example, the number, distance, speed, and the like of vehicles) along any one driving direction of the phases 201, 202, 203, and 204 on the road in real time through auxiliary devices such as a camera, a sensor, and the like, analyze and perform processing and the like on the received road information, and feed back a processing result (for example, a timing scheme) to the corresponding traffic signal lights 101, 102, 103, and 104.
It should be noted that the timing method of the traffic signal provided by the embodiment of the present disclosure may be generally executed by the local entity 300. Accordingly, the timing device, the electronic device, and the readable storage medium of the traffic signal provided by the embodiments of the present disclosure may be generally disposed in the local entity 300.
It should be noted that the intersection 200 composed of two roads shown in fig. 1A may include other numbers of phases besides 4 driving directions corresponding to the phases 201, 202, 203, and 204. For example, fig. 1B illustrates an application scenario of a timing method, an apparatus, an electronic device and a readable storage medium of a traffic signal lamp according to another embodiment of the present disclosure.
As shown in fig. 1B, the intersection 200' may also include 8 phases: the straight-going phases 201a, 202a, 203a and 204a which go straight through the intersection 200 ' after arriving at the intersection 200 ', and the left-turning phases 201b, 202b, 203b and 204b which turn left and enter the adjacent roads after arriving at the intersection 200 ', are respectively provided with corresponding traffic signal lamps 101a, 102a, 103a, 104a, 101b, 102b, 103b and 104b on each phase to guide the traffic operation of the corresponding phase.
It should be noted that, in practical applications, if two or more phases are included in one direction of the intersection, an independent traffic light (as shown in fig. 1B) may be disposed on each phase, and a traffic light (for example, a traffic light with an arrow) capable of distinguishing two or more phases may also be disposed on each phase.
It should be understood that the number of vehicles, traffic lights, intersections, and phases in fig. 1A and 1B are illustrative only. There may be any number of vehicles, traffic lights, intersections, and phases, as desired for implementation.
Next, the method of the present application will be explained and explained by taking the traffic light, the intersection, and the phase shown in fig. 1A as examples.
Fig. 2 shows a flow chart of a timing method of a traffic signal lamp according to an embodiment of the present disclosure.
As shown in fig. 2, the timing method of the traffic signal lamp includes the following steps S101 to S103.
In step S101, the traffic data of the reference phase is obtained to determine a first timing duration.
In step S102, the number of queued vehicles in the pending time period is obtained to determine a second time period.
In step S103, based on the first time-matching duration and the second time-matching duration, the time-matching duration of the time-matching period is determined, so that the traffic signal lamp is displayed according to the time-matching duration.
According to an embodiment of the present disclosure, the phase refers to a time period between a time when a traffic signal lamp of one phase is displayed as a green light as a start time and a time when a traffic signal lamp on another phase (excluding a relative phase) of the following one displayed as a green light as an end time. For example, as in fig. 1A, a period of time between a time at which the traffic signal lights 101 and 103 are displayed as green lights as a start time and a time at which the next traffic signal lights 102 and 104, which are displayed as green lights, are displayed as green lights as an end time is one phase; the time period between the time when the traffic lights 102 and 104 are displayed as green lights and the time when the traffic lights 101 and 103 which are displayed as green lights is the end time is the other stage.
According to an embodiment of the present disclosure, the period to be timed refers to a period of a next undetermined time length. The timing duration of the standby timing phase generally includes a green duration, a yellow duration, and a full red duration of the traffic signal lamp in the standby timing phase. According to an embodiment of the present disclosure, the yellow light time period may be set to 3 s.
According to an embodiment of the present disclosure, the full red duration refers to a length of time during which traffic lights of all phases display red from an end of green light of one phase to a start of green light of another phase. For example, in fig. 1A, the traffic signal lights 101, 102, 103, and 104 are all displayed for a length of time in red from the green light end time of the traffic signal light 101 (or 103) to the green light start time of the traffic signal light 102 (or 103). According to an embodiment of the present disclosure, the full red duration may be set to 3 s.
According to the embodiment of the disclosure, the reference phase is one or more phases which are before the waiting timing phase and have the same passing direction as the timing phase, for example, assuming that the passing direction corresponding to the waiting timing phase in fig. 1A includes phases 201 and 203, the reference phase may be a phase having the passing directions of phases 201 and 203 in a previous cycle of the waiting timing phase, and may further include a phase having the passing directions of phases 201 and 203 in the previous two cycles.
According to the embodiment of the disclosure, the traffic data refers to the data of the traffic condition of the reference stage, such as the data of traffic flow, the number of queued vehicles, the average headway and the like. The obtaining of the traffic data in the reference stage to determine the first timing duration refers to estimating or predicting a time length required by the to-be-timed stage according to historical data, for example, obtaining data of traffic flow, number of queued vehicles, average headway and the like in the reference stage, and predicting the time length required by the to-be-timed stage according to the data. Therefore, the first time-setting duration can be determined according to the historical data, so that the time-setting duration in the period of time-setting can have certain stability, and the disorder of crossing traffic caused by an unstable time-setting scheme is avoided.
According to the embodiment of the disclosure, the number of queued vehicles in the to-be-matched period is the number of queued vehicles in the passing direction corresponding to the to-be-matched period within the full red duration of the previous period of the to-be-matched period. The number of the vehicles in line is the number of the vehicles which do not pass through the stop line corresponding to the traffic signal lamp and are in a stop state (or the speed is less than the speed threshold).
According to the embodiment of the disclosure, the obtaining of the number of queued vehicles in the to-be-scheduled period to determine the second time-scheduling duration refers to estimating or predicting the time length required by the to-be-scheduled period according to the actual situation of the to-be-scheduled period, for example, if the number of queued vehicles is large, the time length of the to-be-scheduled period is predicted, and if the number of queued vehicles is small, the time length of the to-be-scheduled period can be predicted. Therefore, the second time-matching duration can be determined according to the actual situation of the time-matching period to be matched, so that the time-matching duration of the time-matching period to be matched can have certain real-time performance and flexibility, and the road smoothness can be favorably kept.
According to the embodiment of the disclosure, based on the first time-set duration determined according to the historical data (the traffic data in the reference stage) and the time-set duration determined according to the actual situation (the number of queued vehicles in the time-set stage), the traffic signal lamp displays according to the time-set duration, so that the stability and the rationality are high, certain flexibility and real-time performance are achieved, the road is smooth, and the road pressure is reduced.
Fig. 3 shows a flowchart for determining a first timing duration from traffic data according to an embodiment of the present disclosure.
As shown in fig. 3, in the step S102, acquiring the traffic data of the reference phase to determine the first timing duration includes the following steps S201 to S202.
In step S201, a reference traffic flow in the reference phase is obtained to determine a predicted traffic flow in the waiting phase.
In step S202, the average headway of the reference phase is obtained, and the first timing duration is determined based on the predicted traffic flow.
According to the embodiment of the disclosure, the reference traffic flow refers to the number of vehicles passing through the intersection in the reference phase, and may also refer to the number of vehicles expected to pass through the intersection in the reference phase. Wherein the number of vehicles expected to pass through the intersection includes the number of vehicles passing through the intersection, and the number of queued vehicles at the end of the green light.
According to the embodiment of the disclosure, the average headway is an average value of headways of all vehicles passing through the intersection in the reference phase, wherein each vehicle and a previous vehicle pass through the detection line, and the headway of a first vehicle passing through the intersection after the green light starting time is a time length from the green light starting time to a time when the first vehicle passes through the detection line. The detection line may be set as a stop line corresponding to the traffic signal lamp, or may be set near the stop line, which is not specifically limited in this application.
For example, as shown at intersection 200 of fig. 1A, assuming that the traffic direction corresponding to the waiting phase includes phase 201 (or 203), in the reference phase, vehicle c1,…,cqVehicle c passes through the intersection 200 in sequence along phase 201 (or 203)1The time between the time of passing the detection line and the green light starting time of the reference phase is longDegree t1When q is 2 or more, the vehicle ciAnd a vehicle ci-1Headway of tiWherein p and q are positive integers, and q is greater than or equal to p, i is 2, …, q, then the average headway of the reference phase is tf＝(t1+…+tq)/q。
According to an embodiment of the present disclosure, the reference phase may be one or more phases before the to-be-scheduled phase. Next, taking the waiting time period as the ith period of the K +1 th period, and taking the reference period as the ith period of the K-1 th period, where K and i are positive integers and K is greater than or equal to 2 as an example, the process of determining the predicted traffic flow in the waiting time period according to the present application is explained and explained with reference to fig. 4.
FIG. 4 illustrates a flow chart for determining a predicted traffic flow in accordance with an embodiment of the present disclosure.
As shown in fig. 4, in the step S201, the obtaining of the reference traffic flow in the reference phase to determine the predicted traffic flow in the pending phase includes the following steps S301 to S303.
In step S301, the actual traffic flow V at the i-th stage of the K-1 cycle is obtainedK-1And predicted deviation value △k-1And actual vehicle flow V of i stage of K cycleKAnd predicted deviation value △kAnd the prediction deviation value is the difference value between the predicted traffic flow and the actual traffic flow corresponding to the stage.
In step S302, based on the predicted deviation value △k-1And △kDetermining a prediction parameter kg
Figure BDA0002285560340000111
In step S303, the prediction parameter kg and the actual vehicle flow V are used as the basisK-1And VKDetermining the predicted vehicle flow V 'of the ith stage of the K +1 period'K+1：
V′K+1＝VK-1+kg*(VK-VK-1)。
According to the embodiment of the disclosure, the prediction deviation value is a difference value between the predicted traffic flow and the actual traffic flow corresponding to the stage. For example, when the configuration time of the ith stage of the K-1 period is determined, if the predicted vehicle flow of the ith stage of the K-1 period is V'K-1And the actual traffic flow is VK-1Predicted deviation △ for phase i of cycle K-1k-1＝V′K-1-VK-1(ii) a And when the configuration time of the ith stage of the K period is determined, if the predicted traffic flow of the ith stage of the K period is V'KAnd the actual traffic flow is VKPredicted deviation △ for phase i of cycle Kk＝V′K-VK。
According to the embodiment of the disclosure, the predicted traffic flow V 'of the ith stage of the K +1 period is determined according to the predicted error and the actual traffic flow of the corresponding stage of the first two periods of the standby period'K+1And in time, the prediction result is more reliable, and the real-time characteristic is met, for example, the traffic flow at night is smaller, and the traffic flow at the peak of working and working is larger, so that the timing scheme is determined according to the traffic condition of the reference stage, the reasonability of the timing time of the period to be timed is improved, and the road pressure is favorably reduced.
Fig. 5 illustrates a flow chart for determining a first timing duration based on an average headway in accordance with an embodiment of the present disclosure.
As shown in fig. 5, in the step S202, the obtaining of the average headway of the reference phase and the determining of the first timing duration based on the predicted traffic flow may include the following steps S401 to S403.
In step S401, the average headway of the reference phase is obtained.
In step S402, a first green light duration is determined based on the headway and the predicted traffic flow.
In step S403, a timing duration of the standby timing phase is determined based on the first green light duration.
According to the embodiment of the disclosure, based on the headway and the predicted traffic flow, the first green light duration in the waiting period can be determined. As described above, the timing duration of a phase may include a yellow duration and a full red duration in addition to a green duration, and thus, the timing duration of the to-be-timed phase may be determined based on the first green duration in combination with the yellow duration and the full red duration.
For example, assume that the average headway of the reference phase acquired is tf＝(t1+…+tq) Q (step S401), based on the average headway and the predicted traffic flow, it may be determined that the first green light duration in the first timing duration is V'K+1·tf(step S402), the yellow light duration t is combinedyelAnd a full red duration tredThe first timing duration may be determined to be T'K+1＝V′K+1·tf+tyel+tred(step S403).
Fig. 6 illustrates a flow chart for determining a timing duration in accordance with an embodiment of the disclosure.
As shown in fig. 6, in the step S103, determining the timing duration of the wait-for-time period based on the first timing duration and the second timing duration includes the following steps S501 to S502.
In step S501, weights corresponding to the first timing duration and the second timing duration are determined.
In step S502, based on the weight, a timing duration of the to-be-timed period is determined.
For example, suppose that the first timing duration is T 'can be determined according to the traffic data of the reference phase'K+1＝V′K+1·tf+tyel+tred(step S101);
and then according to the number of the queued vehicles in the waiting time period as V ″)K+1Average headway tfDuration t of yellow lightyelAnd a full red duration tredThe second timing duration T ″, may be determinedK+1Comprises the following steps:
T″K+1＝V″K+1·tf+tyel+tred(step S102);
based on the first timingLong T'K+1And a second timing duration T ″K+1Determining the time-distribution duration T of the time-distribution periodK+1：
TK+1＝λ1·T′K+1+λ2·T″K+1，λ1+λ2＝1；
So that the traffic signal lamp can set the time length T according to the timeK+1Display is performed (step S103).
According to the embodiment of the disclosure, the first timing duration is determined according to the traffic data of the reference phase, the second timing duration is determined according to the number of queued vehicles of the waiting timing phase, and when the timing duration of the waiting timing phase is determined, the weights of the first timing duration and the second timing duration can be determined according to the traffic characteristics of a road.
For example, if there are fewer passing vehicles on the road and the number of queued vehicles in the full red time period is generally less, the weight of the first timing time period may be increased, so that the waiting time period may take historical data into more consideration, and vehicles arriving in the green light time period may pass through the intersection as much as possible, so as to reduce the waiting time period of the vehicles.
If more vehicles pass through the road, the weight of the second timing time duration can be increased, so that the vehicles arriving before the green light starts can pass through the intersection in the waiting timing stage, and the vehicles arriving after the green light starts need to wait for one cycle, so that the waste time of the green light is reduced, and the road pressure is relieved.
Fig. 7 illustrates a block diagram of a timing apparatus 700 of a traffic signal according to an embodiment of the present disclosure. The apparatus may be implemented as part or all of an electronic device through software, hardware, or a combination of both.
As shown in fig. 7, the timing device 700 of the traffic signal lamp includes a first obtaining module 701, a second obtaining module 702, and a timing module 703.
The first obtaining module 701 is configured to obtain the traffic data of the reference phase to determine a first timing duration;
the second obtaining module 702 is configured to obtain the number of queued vehicles in the waiting time period to determine a second time period;
the timing module 703 is configured to determine a timing duration of the to-be-timed period based on the first timing duration and the second timing duration, so that the traffic signal lamp is displayed according to the timing duration.
According to an embodiment of the present disclosure, the obtaining the traffic data of the reference phase to determine the first timing duration includes:
acquiring the reference traffic flow of the reference stage to determine the predicted traffic flow of the waiting time stage;
and acquiring the average headway of the reference stage, and determining the first timing duration based on the predicted traffic flow.
According to the embodiment of the disclosure, the waiting time period is the ith period of the K +1 th period, the reference period includes the ith period of the K period and the ith period of the K-1 th period, where K and i are positive integers, and K is greater than or equal to 2, and the obtaining of the reference traffic flow of the reference period to determine the predicted traffic flow of the waiting time period includes:
acquiring the actual traffic flow V of the ith stage of the K-1 periodK-1And predicted deviation value △k-1And actual vehicle flow V of i stage of K cycleKAnd predicted deviation value △kThe prediction deviation value is the difference value between the predicted traffic flow and the actual traffic flow corresponding to the stage;
based on the predicted deviation value △k-1And △kAnd determining a prediction parameter kg:
Figure BDA0002285560340000141
based on the predicted parameter kg and the actual traffic flow VK-1And VKDetermining the predicted vehicle flow V 'of the ith stage of the K +1 period'K+1：
V′K+1＝VK-1+kg*(VK-VK-1)。
According to an embodiment of the present disclosure, the obtaining the average headway of the reference phase and determining the first timing duration based on the predicted traffic flow includes:
acquiring the average headway of the reference stage;
determining a first green light duration based on the headway and the predicted traffic flow;
and determining the time-distribution time length of the time-distribution period based on the first green light time length.
According to an embodiment of the present disclosure, the determining the time-dispensing duration of the to-be-dispensed time phase based on the first time-dispensing duration and the second time-dispensing duration includes:
determining weights corresponding to the first time-matching duration and the second time-matching duration;
and determining the time-distribution duration of the time-distribution period based on the weight.
Fig. 8 shows a block diagram of an electronic device 800 according to an embodiment of the disclosure.
As shown in fig. 8, the electronic device 800 includes a memory 801 and a processor 802. The memory 801 is used to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor 802 to implement the following method steps:
acquiring traffic data of a reference stage to determine a first timing duration;
acquiring the number of queued vehicles in a period of waiting for timing to determine a second timing duration;
and determining the time-distribution time length of the period to be distributed based on the first time-distribution time length and the second time-distribution time length so as to display the traffic signal lamp according to the time-distribution time length.
According to an embodiment of the present disclosure, the obtaining the traffic data of the reference phase to determine the first timing duration includes:
acquiring the reference traffic flow of the reference stage to determine the predicted traffic flow of the waiting time stage;
and acquiring the average headway of the reference stage, and determining the first timing duration based on the predicted traffic flow.
According to the embodiment of the disclosure, the waiting time period is the ith period of the K +1 th period, the reference period includes the ith period of the K period and the ith period of the K-1 th period, where K and i are positive integers, and K is greater than or equal to 2, and the obtaining of the reference traffic flow of the reference period to determine the predicted traffic flow of the waiting time period includes:
acquiring the actual traffic flow V of the ith stage of the K-1 periodK-1And predicted deviation value △k-1And actual vehicle flow V of i stage of K cycleKAnd predicted deviation value △kThe prediction deviation value is the difference value between the predicted traffic flow and the actual traffic flow corresponding to the stage;
based on the predicted deviation value △k-1And △kAnd determining a prediction parameter kg:
Figure BDA0002285560340000151
based on the predicted parameter kg and the actual traffic flow VK-1And VKDetermining the predicted vehicle flow V 'of the ith stage of the K +1 period'K+1：
V′K+1＝VK-1+kg*(VK-VK-1)。
According to an embodiment of the present disclosure, the obtaining the average headway of the reference phase and determining the first timing duration based on the predicted traffic flow includes:
acquiring the average headway of the reference stage;
determining a first green light duration based on the headway and the predicted traffic flow;
and determining the time-distribution time length of the time-distribution period based on the first green light time length.
According to an embodiment of the present disclosure, the determining the time-dispensing duration of the to-be-dispensed time phase based on the first time-dispensing duration and the second time-dispensing duration includes:
determining weights corresponding to the first time-matching duration and the second time-matching duration;
and determining the time-distribution duration of the time-distribution period based on the weight.
FIG. 9 illustrates a schematic block diagram of a computer system 900 suitable for use in implementing a timing method for a traffic signal according to an embodiment of the present disclosure.
As shown in fig. 9, the computer system 900 includes a Central Processing Unit (CPU)901, which can execute various processes in the above-described embodiments according to a program stored in a Read Only Memory (ROM)902 or a program loaded from a storage section 908 into a Random Access Memory (RAM) 903. In the RAM903, various programs and data necessary for the operation of the system 900 are also stored. The CPU901, ROM902, and RAM903 are connected to each other via a bus 904. An input/output (I/O) interface 905 is also connected to bus 904.
To the I/O interface 905, AN input section 906 including a keyboard, a mouse, and the like, AN output section 907 including a device such as a Cathode Ray Tube (CRT), a liquid crystal display (L CD), and the like, a speaker, and the like, a storage section 908 including a hard disk, and the like, and a communication section 909 including a network interface card such as a L AN card, a modem, and the like, the communication section 909 performs communication processing via a network such as the internet, a drive 910 is also connected to the I/O interface 905 as necessary, a removable medium 911 such as a magnetic disk, AN optical disk, a magneto-optical disk, a semiconductor memory, and the like is mounted on the drive 910 as necessary, so that a computer program read out therefrom is mounted into the storage section 908 as necessary.
In particular, the above described methods may be implemented as computer software programs according to embodiments of the present disclosure. For example, embodiments of the present disclosure include a computer program product comprising a computer program tangibly embodied on a readable medium thereof, the computer program containing program code for performing the above-described data management and/or access methods. In such an embodiment, the computer program may be downloaded and installed from a network through the communication section 909, and/or installed from the removable medium 911.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowcharts or block diagrams may represent a module, a program segment, or a portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units or modules described in the embodiments of the present disclosure may be implemented by software or by programmable hardware. The units or modules described may also be provided in a processor, and the names of the units or modules do not in some cases constitute a limitation of the units or modules themselves.
As another aspect, the present disclosure also provides a readable storage medium, which may be a readable storage medium contained in the electronic device or the computer system in the above embodiments; or may be a separately present, non-built-in, readable storage medium. The readable storage medium stores one or more programs for use by one or more processors in performing the methods described in the present disclosure.
The foregoing description is only exemplary of the preferred embodiments of the disclosure and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present disclosure is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features and (but not limited to) the features disclosed in this disclosure having similar functions are replaced with each other to form the technical solution.

Claims (10)

1. A method of timing a traffic signal, comprising:
acquiring traffic data of a reference stage to determine a first timing duration;
acquiring the number of queued vehicles in a period of waiting for timing to determine a second timing duration;
and determining the time-distribution time length of the period to be distributed based on the first time-distribution time length and the second time-distribution time length so as to display the traffic signal lamp according to the time-distribution time length.
2. The method of claim 1, wherein obtaining the traffic data of the reference phase to determine the first timing duration comprises:
acquiring the reference traffic flow of the reference stage to determine the predicted traffic flow of the waiting time stage;
and acquiring the average headway of the reference stage, and determining the first timing duration based on the predicted traffic flow.
3. The method according to claim 2, wherein the waiting period is the ith period of the K +1 th period, and the reference period includes the ith period of the K-1 th period and the ith period of the K-1 th period, where K and i are positive integers, and K is greater than or equal to 2, wherein the obtaining the reference traffic flow of the reference period to determine the predicted traffic flow of the waiting period includes:
acquiring the actual traffic flow V of the ith stage of the K-1 periodK-1And predicted deviation value △k-1And actual vehicle flow V of i stage of K cycleKAnd predicted deviation value △kThe prediction deviation value is the difference value between the predicted traffic flow and the actual traffic flow corresponding to the stage;
based on the predicted deviation value △k-1And △kAnd determining a prediction parameter kg:
Figure FDA0002285560330000011
based on the predicted parameter kg and the actual traffic flow VK-1And VKDetermining the predicted vehicle flow V 'of the ith stage of the K +1 period'K+1：
V′K+1＝VK-1+kg*(VK-VK-1)。
4. The method of claim 2, wherein the obtaining the average headway of the reference phase and determining the first timing duration based on the predicted vehicle flow comprises:
acquiring the average headway of the reference stage;
determining a first green light duration based on the headway and the predicted traffic flow;
and determining the time-distribution time length of the time-distribution period based on the first green light time length.
5. The method of claim 1, wherein determining the timing duration of the pending timing phase based on the first timing duration and the second timing duration comprises:
determining weights corresponding to the first time-matching duration and the second time-matching duration;
and determining the time-distribution duration of the time-distribution period based on the weight.
6. A timing device for a traffic signal, comprising:
the first acquisition module is configured to acquire the traffic data of the reference stage to determine a first timing duration;
the second acquisition module is configured to acquire the number of queued vehicles in the period of waiting for timing so as to determine a second timing duration;
and the time distribution module is configured to determine the time distribution duration of the time distribution period to be distributed based on the first time distribution duration and the second time distribution duration so that the traffic signal lamp is displayed according to the time distribution duration.
7. The apparatus of claim 6, wherein obtaining the traffic data of the reference phase to determine the first timing duration comprises:
acquiring the reference traffic flow of the reference stage to determine the predicted traffic flow of the waiting time stage;
and acquiring the average headway of the reference stage, and determining the first timing duration based on the predicted traffic flow.
8. The method according to claim 7, wherein the waiting period is the ith period of the K +1 th period, and the reference period includes the ith period of the kth period and the ith period of the K-1 th period, where K and i are positive integers and K is greater than or equal to 2, and wherein the obtaining the reference traffic flow of the reference period to determine the predicted traffic flow of the waiting period comprises:
acquiring the actual traffic flow V of the ith stage of the K-1 periodK-1And predicted deviation value △k-1And actual vehicle flow V of i stage of K cycleKAnd predicted deviation value △kThe prediction deviation value is the difference value between the predicted traffic flow and the actual traffic flow corresponding to the stage;
based on the predicted deviation value △k-1And △kAnd determining a prediction parameter kg:
Figure FDA0002285560330000021
based on the predicted parameter kg and the actual traffic flow VK-1And VKDetermining the predicted vehicle flow V 'of the ith stage of the K +1 period'K+1：
V′K+1＝VK-1+kg*(VK-VK-1)。
9. An electronic device comprising a memory and a processor; wherein the memory is to store one or more computer instructions, wherein the one or more computer instructions are to be executed by the processor to implement the method steps of any of claims 1-5.
10. A readable storage medium having stored thereon computer instructions, characterized in that the computer instructions, when executed by a processor, carry out the method steps of any of claims 1-5.
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