CN114155725B - Timing control method and device for intersection signal lamp - Google Patents
Timing control method and device for intersection signal lamp Download PDFInfo
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- CN114155725B CN114155725B CN202210119883.2A CN202210119883A CN114155725B CN 114155725 B CN114155725 B CN 114155725B CN 202210119883 A CN202210119883 A CN 202210119883A CN 114155725 B CN114155725 B CN 114155725B
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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
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0125—Traffic data processing
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0137—Measuring and analyzing of parameters relative to traffic conditions for specific applications
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/065—Traffic control systems for road vehicles by counting the vehicles in a section of the road or in a parking area, i.e. comparing incoming count with outgoing count
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Abstract
The invention discloses a timing control method and a timing control device for intersection signal lamps, belongs to the technical field of timing control, and is used for solving the technical problems that the road junction is blocked at the early and late peak periods and the traffic operation is inconvenient due to unbalanced signal lamp timing when the traffic flow is large at the early and late peak periods in the prior art. The method comprises the following steps: counting the retained vehicles in the retention area of the intersection lane through a data acquisition device to obtain the quantity of the retained vehicles in the retention area; monitoring the lane of the intersection through a satellite monitoring system to obtain the congestion state of the lane of the intersection; according to the congestion state and the number of the retained vehicles, carrying out periodic calculation on the traffic signal lamp to obtain signal periodic time; calculating the phase green time through a data processor to obtain the maximum phase time of each phase; and performing time distribution control on the traffic signal lamp according to the signal cycle time and the maximum phase time, so as to realize management on time length adjustment of the traffic signal lamp.
Description
Technical Field
The application relates to the field of timing control, in particular to a timing control method and device for intersection signal lamps.
Background
With the progress of scientific technology and the rapid development of economy in China, the holding rate of private cars is rapidly increased, however, due to the increase of urban population, the existing traffic roads are increasingly blocked, and the relief of urban traffic jam is an important task for intelligent traffic development. Due to the existence of the peak at morning and evening, the signal lamp timing of the intersection of the traditional urban road network is usually fixed timing and manual adjustment, so that the signal lamp timing can not be automatically optimized along with the change of road conditions, a large amount of vehicles in east and west directions at certain time intervals at some intersections can be blocked, vehicles in north and south directions are scattered but not provided with a plurality of vehicles, but the green-to-green ratio in east and west directions is still very low, the blocking condition at the intersections can be hardly relieved, the signal lamp timing at other adjacent intersections can be influenced later, and a chain reaction is generated.
Disclosure of Invention
The embodiment of the application provides a timing control method and a timing control device for intersection signal lamps, which are used for solving the following technical problems: the existing traffic flow in the morning and evening peak periods is large, and the traffic light distribution is unbalanced, so that the road junction jam in the morning and evening peak periods can be caused, and the traffic operation is inconvenient.
The embodiment of the application adopts the following technical scheme:
on one hand, the embodiment of the application provides a timing control method for intersection signal lamps, which is characterized by comprising the following steps: counting the detained vehicles in the detained area of the intersection lane by a data acquisition device to obtain the number of the detained vehicles in the detained area; monitoring the intersection lane through a satellite monitoring system to obtain the congestion state of the intersection lane; according to the congestion state and the number of the detained vehicles, carrying out cycle calculation on traffic signal lamps to obtain the optimal signal cycle time; calculating the phase green time through a data processor to obtain the maximum phase time of each phase; and performing timing control on the traffic signal lamp according to the signal cycle time and the maximum phase time, so as to realize management on time length adjustment of the traffic signal lamp.
According to the embodiment of the application, the data acquisition device mounted on the vehicle is used for counting the detained vehicles in the detained area of the intersection lane to obtain the number of the detained vehicles in the detained area, then the satellite detection system is used for monitoring the congestion state of the intersection lane to obtain the congestion state of the intersection lane, then the period calculation is carried out according to the monitored congestion state and the order of magnitude of the detained vehicles in the detained area to obtain the optimal signal period, then the phase green time is calculated to obtain the maximum phase time of each phase, finally the timing control is carried out on the signal lamps of the intersection lane according to the optimal signal period time and the maximum phase time, and the adjustment of the green time of the traffic signal lamps is completed. The adjustment of the signal lamps is realized by counting vehicles in different phases, the time of the signal lamps can be reasonably arranged in the high-low peak period, and the passing of the vehicles is smoothly completed.
In a feasible implementation manner, the data acquisition unit is used for acquiring a staying area of an intersection lane to obtain the number of vehicles in the staying area, and the method specifically comprises the following steps: collecting the number of vehicles driving into each single lane of the detention area through an entrance data collector; collecting the number of vehicles running out of each single lane of the detention area through an exit data collector; the inlet data acquisition unit and the outlet data acquisition unit are separated by a preset distance; according to CRetention=CSingle lane feeding-CSingle lane exitObtaining the number C of the detained vehicles in each single lane of the detained areaRetention(ii) a Wherein, CSingle lane feedingNumber of vehicles per single lane for entering said detention zone, CSingle lane exitThe number of vehicles driving out of the corresponding single lane.
In a feasible implementation manner, if two adjacent straight lanes exist in the intersection lane, the entrance data collectors of the two adjacent straight lanes are connected to obtain a total straight lane entrance data collector; collecting the number of vehicles running into the total straight lane of the detention area through the total straight lane entrance data collector; according to CStay in straight line=CTotal straight-through lane advance-CFirst straight-through lane exit-CSecond straight-driving laneObtaining the number C of the detained vehicles of the two adjacent straight lanes in the detaining areaStay in straight line(ii) a Wherein, CTotal straight-through lane advanceNumber of vehicles entering the general straight lane of the detention zone, CFirst straight-through lane exitNumber of vehicles exiting a first of said two adjacent straight lanes, CSecond straight-driving laneThe number of vehicles which exit the second straight lane of the two adjacent straight lanes.
The embodiment of the application connects the inlet data collectors of the two straight lanes to serve as a total straight lane inlet data collector, so that the problem that the number of retained vehicles in a straight lane retention area is inaccurate due to vehicle change between the two straight lanes can be prevented.
In a feasible implementation manner, the number of vehicles in a left-turn lane in the intersection lane is counted according to the entrance data collector and the exit data collector of the left-turn lane to obtain the number of retained vehicles in the left-turn lane of the retention area; and the length of a boundary between the left-turn lane and the straight lane is greater than the preset distance.
In a possible embodiment, the exit data collector and the entrance data collector use a loop coil in a camera above a lane as a sensor to count vehicles staying in the staying area.
According to the embodiment of the application, the annular coil sensor of the existing camera is adopted, so that resources can be effectively utilized, and the cost of the whole device is reduced.
In a feasible implementation manner, the monitoring of the intersection lane by a satellite monitoring system to obtain the congestion state of the intersection lane specifically includes: monitoring the lane of the intersection in real time according to a satellite monitoring system GPS, and calculating the sum of the key traffic flow ratios of each phase to obtain congestion state parameters; if the congestion state parameter is less than 0.6, the congestion state is a traffic flow unsaturated state; and if the congestion state parameter is greater than or equal to 0.6, the congestion state is a traffic flow supersaturation state.
In a possible implementation manner, performing a period calculation of a traffic signal lamp according to the congestion state and the number of the vehicles staying in the traffic signal lamp to obtain an optimal signal period time specifically includes: if the congestion state is a state of unsaturated traffic flow, the method is based on
Obtaining the optimal signal cycle time C of the unsaturated traffic flow0(ii) a Wherein, L is the total loss time of each period; y is the congestion state parameter, namely the sum of the flow rate ratios of key vehicles in each phase; if the congestion state is a traffic flow supersaturation state, the method is based onC0=1.23Le（2.46-0.02L）YObtaining the optimal signal cycle time C of the oversaturated traffic flow0Where e is the base of the natural logarithm.
In a possible embodiment, the calculating, by the data processor, the phase green time to obtain the maximum phase time of each phase includes: according to
Obtaining a total set of phases in a period; wherein, P1、P2、P3、P4Respectively representing four phases of the lane of the intersection, wherein the phases represent traffic flow directions; paPhase sets for ending execution of the vehicle in the stagnation zone in one cycle, PwIs the phase set that the vehicle did not perform in the stagnation zone during one cycle. According to
Obtaining the total number Q of the detained vehicles of all the unexecuted phasest(ii) a Wherein Q isiThe number of parked vehicles for the ith unexecuted phase,
is the sum of the ith unexecuted phase set in one cycle; according to tp_min=tg_min+tyellowTo obtain the minimum phase time tp_min(ii) a And according to
Obtaining the actual time t of the executed ith phasei actWherein, tg_minMinimum green time, t, for each phaseyellowTime of yellow light, tdelayProlonging the green time for the unit; according to
To obtain the maximum phase time t of the ith phasei p_max(ii) a Where w is the number of phases to be executed in one cycle.
In a feasible implementation manner, the timing control is performed on the traffic signal lamp according to the signal cycle time and the maximum phase time, so as to implement management on the time length adjustment of the traffic signal lamp, which specifically includes: judging the signal period and the maximum phase time through an interval judgment program to obtain an interval timing scheme matched with the lane of the intersection; the interval timing scheme is preset by a simulation experiment; and setting the interval timing scheme through a signal machine, and adjusting the duration of the green light in the traffic signal lamp.
On the other hand, the embodiment of the application further provides a timing control device for intersection signal lamps, which comprises: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a method of intersection signal timing control according to any of the embodiments described above.
The embodiment of the application provides a time distribution control method and device for a crossing signal lamp, the number of vehicles in a detention area is counted through a data acquisition unit, then the congestion state of an intersection lane is judged according to a satellite monitoring system, the optimal signal cycle time and the optimal maximum phase time are obtained, then an optimal time distribution scheme is selected for the intersection lane through a signal machine, and the time length of the traffic signal lamp is adjusted. In the data acquisition unit, the annular coil in the existing camera on the road is used as a sensor to identify and count the vehicles, so that the cost is low, and the resources can be saved. And through signal lamp timing control, the signal lamp in a congestion area can be adjusted in time to relieve the congestion of the intersection, the passing of vehicles is reasonably finished in the high and low peak periods, and the problem of the congestion of the intersection is relieved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts. In the drawings:
fig. 1 is a flowchart of a timing control method for an intersection signal lamp according to an embodiment of the present disclosure;
fig. 2 is a flow structure diagram of a timing control device for an intersection signal lamp according to an embodiment of the present disclosure;
fig. 3 is a data acquisition distribution diagram of a timing control device for an intersection signal lamp according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a timing control device of an intersection signal lamp according to an embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any inventive step based on the embodiments of the present disclosure, shall fall within the scope of protection of the present application.
The embodiment of the application provides a timing control method for an intersection signal lamp. As shown in fig. 1, the method specifically includes steps 101 to 105:
Specifically, the number of vehicles entering each single lane of the detention zone is collected by an entrance data collector. And then, acquiring the number of vehicles exiting each single lane of the detention area by an exit data acquisition device. The inlet data acquisition unit and the outlet data acquisition unit are separated by a preset distance.
In general, according to CRetention=CSingle lane feeding-CSingle lane exitObtaining the number C of the detained vehicles per single lane of the detained areaRetention. Wherein, CSingle lane feedingNumber of vehicles per single lane to enter detention zone, CSingle lane exitThe number of vehicles driving out of the corresponding single lane. And the exit data collector and the entrance data collector adopt an annular coil in a camera above the lane as a sensor, and finally count the retained vehicles in the retention area.
And if two adjacent straight lanes exist in the intersection lane, connecting the inlet data collectors of the two adjacent straight lanes to obtain a total straight lane inlet data collector. And then, acquiring the number of vehicles driving into the total straight lane of the detention area by a data acquisition device of the entrance of the total straight lane. Then according to CStay in straight line=CTotal straight-through lane advance-CFirst straight-through lane exit-CSecond straight-driving laneFinally, the number C of the retained vehicles of two adjacent straight lanes in the retention area is obtainedStay in straight line. Wherein, CTotal straight-through lane advanceNumber of vehicles driving into total straight lanes of detention zone, CFirst straight-through lane exitNumber of vehicles exiting a first of two adjacent straight lanes, CSecond straight-driving laneThe number of vehicles driving out of the second straight lane of the two adjacent straight lanes.
And if the intersection lane has a left-turn lane, counting the number of the left-turn lanes according to an entrance data collector and an exit data collector of the left-turn lane in the intersection lane, and finally obtaining the number of the left-turn lanes in the detention area. And the length of a boundary solid line of the left-turn lane and the straight lane is greater than a preset distance.
In an embodiment, fig. 2 is a flowchart of a timing control device for intersection signal lights according to an embodiment of the present application, and as shown in fig. 2, four roads connected to an intersection in the figure are respectively regarded as a single lane. And an annular coil is arranged in the upper camera at the position of each single lane close to the intersection and is used as a sensor of the data acquisition unit. And then, arranging a second camera at a preset distance in the direction away from the intersection, wherein the second camera is also provided with a ring coil which is used as a sensor of a second data acquisition unit. And taking the driving direction of the vehicle as a reference, wherein the data acquisition unit through which the vehicle passes for the first time is an entrance data acquisition unit, and the data acquisition unit through which the vehicle passes for the second time is an exit data acquisition unit. For example, if the driving direction of the left lane in fig. 2 is from left to right, the left data collector is the entrance data collector, and the right data collector is the exit data collector. The area between the two data collectors is the detention area of the left single lane. And the number of the left single-lane remained vehicles is the difference between the number of the vehicles counted by the entrance data collector and the number of the vehicles counted by the exit data collector. The whole detention zone is the sum of all single-lane detention zones, and the number of detention vehicles in the whole detention zone is the sum of the number of detention vehicles in all single lanes.
According to the practical lane condition, under the condition that two adjacent straight lanes exist, the entrance data collectors of the two straight lanes are connected to form a whole, the number of vehicles which influence the practical statistics of the detention area due to the fact that the vehicles change back and forth between the two straight lanes is reduced, and then the difference between the number of the vehicles collected by the entrance data collectors after connection and the number of the vehicles collected by the first straight lane exit data collector and the second straight lane exit data collector is used as the number of the detention vehicles in the total straight lane detention area. In addition, a boundary needs to be arranged between the straight lane and the left-turn lane, the length of the boundary is larger than the preset distance between the entrance data collector and the exit data collector, the vehicle cannot cross the boundary after entering the left-turn lane and can only run on the left-turn lane, the boundary can be set as facilities such as guardrails and the like which cannot be passed by the vehicle, and the situation that the number of the vehicles collected by the entrance data collector is changed, so that the number of the vehicles in the detention area counted by the left-turn lane and the straight lane is influenced is prevented.
In an embodiment, fig. 3 is a data collection distribution diagram of a timing control device of an intersection signal lamp according to an embodiment of the present disclosure, as shown in fig. 3, two adjacent straight lanes, namely a straight lane 1 and a straight lane 2, exist in one lane, and an entry data collector 2 and an entry data collector 3 corresponding to the two straight lanes are connected to form an integral, and a first statistics is performed on the number of vehicles jointly entering the two straight lanes, and then a second statistics is performed on the number of vehicles exiting by the exit data collector 2 and the exit data collector 3, where a difference between the two statistics is the number of vehicles staying in a staying area on the total straight lane, so as to avoid inaccurate statistics of vehicles staying in the staying area due to the fact that the vehicles change between the straight lane 1 and the straight lane 2.
In fig. 2, a boundary solid line exists between the straight lane 1 and the left-turn lane, and the length of the boundary solid line is greater than the length of a stagnation area between the entrance data collector 1 and the exit data collector 1, so that the behavior of changing the road of the vehicle is completed before the entrance data collector 1 collects the data, and the accuracy of the number of vehicles in the stagnation area of the left-turn lane is ensured.
And 102, monitoring the intersection lane through a satellite monitoring system, and then obtaining the congestion state of the intersection lane.
Specifically, firstly, a satellite monitoring system GPS is used for monitoring lanes at an intersection in real time, and the sum of the key traffic flow ratio of each phase, namely the congestion state parameter, is calculated. And if the congestion state parameter is less than 0.6, the congestion state is a state that the traffic flow is not saturated. And if the congestion state parameter is greater than or equal to 0.6, the congestion state is a traffic flow oversaturation state.
In one embodiment, firstly, a satellite detection system GPS is used to monitor the congestion condition of the intersection lane, and a calculation is performed according to the congestion condition, wherein the calculation method is not limited, and finally, the congestion state parameter of the intersection is obtained. And if the obtained congestion state parameter is 0.4, the congestion state is a state of unsaturated traffic flow, if the obtained congestion state parameter is 0.7, the congestion state is a state of oversaturation traffic flow, and finally, the result is fed back to the timing control device of the intersection signal lamp according to the congestion state parameter.
And 103, carrying out cycle calculation of the traffic signal lamp according to the congestion state and the number of the retained vehicles to obtain the optimal signal cycle time.
Specifically, if the received congestion state is a traffic unsaturated state, the method is based on
Obtaining the optimal signal cycle time C of the unsaturated traffic flow0. Where L is the total loss time per cycle, which is generally the time required for the vehicle to re-accelerate when the yellow light is changed, and one yellow light is set to a fixed 3 seconds. And Y is a congestion state parameter, namely the sum of the key traffic flow ratios of each phase. If the received congestion state is a traffic flow over-saturation state, the method is based on
Obtaining the optimal signal cycle time C of the oversaturated traffic flow0Where e is the base of the natural logarithm.
As a feasible implementation mode, firstly, the congestion state of an intersection lane is obtained through a satellite monitoring system GPS, then the number of vehicles is counted according to loop coil vehicle sensors of an entrance data collector and an exit data collector, the number of detained vehicles in a detained area is obtained through calculation, then the congestion state and the number of detained vehicles are sent to a data processor, and if the received congestion state is a state that the traffic flow is not saturated, the congestion state and the number of detained vehicles are sent to the data processor according to a Webster formula
Obtaining the optimum signal cycle time C at the unsaturated traffic flow0(ii) a If the received congestion state is the traffic flow over-saturation state, the estimation formula is improved according to the HCM2000
Calculating to obtain the optimal signal cycle of the oversaturated traffic flowPeriod C0。
And step 104, calculating the phase green time through the data processor to obtain the maximum phase time of each phase.
In particular, according to
And obtaining a total set of phases in one period. Wherein, P1、P2、P3、P4The four phases of the lane at the intersection are respectively represented, and the phase represents the traffic flow direction. PaPhase sets for ending execution of the vehicle in the stagnation zone in one cycle, PwIs the phase set that the vehicle did not perform in the stagnation zone during one cycle. The phase set of the ending execution is the phase set of the ending green light, and the phase set of the non-ending execution is the phase set of the ending green light.
Further in accordance with
Obtaining the total number Q of the detained vehicles of all the unexecuted phasest. Wherein Q isiThe number of parked vehicles for the ith unexecuted phase,
is the sum of the ith unexecuted set of phases in a cycle.
Further, according to tp_min=tg_min+tyellowTo obtain the minimum phase time tp_min. And according to
Obtaining the actual time t of the executed ith phasei actWherein, tg_minMinimum green time, t, for each phaseyellowTime of yellow light, tdelayThe green light time is extended for the unit.
Further in accordance with
To obtain the maximum phase time t of the ith phasei p_max. Where w is the number of phases to be executed in one cycle.
As a feasible implementation mode, firstly, in a period, the phases of four intersection lanes form a phase total set, and the phase total set comprises a phase set P for finishing the execution of the vehicles in the detention area in the periodaFor a phase set P not performed in the stagnation zone with the vehicle in one cyclewThe phase indicates the direction of the traffic flow per lane, and then the number Q of the parked vehicles according to the ith unexecuted phaseiSum with the ith unexecuted phase set in one cycle
Obtaining the total number Q of the detained vehicles of all the unexecuted phasestThen according to the yellow light time tyellowWith minimum green time t of each phaseg_minIs obtained by obtaining the minimum phase time tp_minThen the unit prolongs the green time tdelayWith the resulting minimum green time t for each phaseg_minTo find the actual time t of the i-th phase of the vehicle in the parking areai actFinally according to
To obtain the maximum phase time t of the ith phasei p_maxThereby obtaining the maximum phase time for each phase.
And 105, performing timing control on the traffic signal lamp according to the signal cycle time and the maximum phase time, and finally realizing management on time adjustment of the traffic signal lamp.
Specifically, a signal period and the maximum phase time are judged through an interval judgment program, and an interval timing scheme matched with an intersection lane is obtained. The interval timing scheme is preset by a simulation experiment. And then setting an interval timing scheme through a signal machine, and adjusting the duration of a green light in the traffic signal lamp.
In one embodiment, firstly, a phase comparison interval most suitable for lane signal lamps at an intersection is simulated through simulation of vissim to obtain an interval timing scheme shown in table 1, then traffic flow of four intersections is input through an interval judgment program to obtain maximum phase time and an optimum periodic signal of each phase, then a closest interval timing scheme is judged and selected from the table 1 according to each maximum phase time and the optimum periodic signal, and the traffic signal lamps at the intersection are set through a signal machine to finish adjustment of green time and periodic time of the traffic signal lamps so as to obtain signal lamp timing beneficial to vehicle passing.
TABLE 1
Table 1 shows a phase interval timing scheme of 10 most suitable intersection lane signal lights obtained through a vissim simulation.
In addition, the embodiment of the present application further provides a timing control device for an intersection signal lamp, as shown in fig. 4, the timing control device 400 for the intersection signal lamp specifically includes:
at least one processor 401, and a memory 402 communicatively coupled to the at least one processor 401. Wherein the memory 402 stores instructions executable by the at least one processor 401 to enable the at least one processor 401 to:
counting the detained vehicles in the detained area of the intersection lane by a data acquisition device to obtain the number of the detained vehicles in the detained area;
monitoring the lane of the intersection through a satellite monitoring system to obtain the congestion state of the lane of the intersection;
according to the congestion state and the number of the detained vehicles, carrying out periodic calculation on traffic signal lamps to obtain signal period time;
calculating the phase green time through a data processor to obtain the maximum phase time of each phase;
and performing time distribution control on the traffic signal lamp according to the signal cycle time and the maximum phase time, so as to realize management on time length adjustment of the traffic signal lamp.
This application has the toroidal coil in the camera through existing on the road to be the sensor, discerns the count to the vehicle, not only can make with low costs, but also resources are saved. And through signal lamp timing control, the signal lamp in a congestion area can be adjusted in time to relieve the congestion of the intersection, the passing of vehicles is reasonably finished in the high and low peak periods, and the problem of the congestion of the intersection is relieved.
The embodiments in the present application are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus, non-volatile computer storage medium embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and for relevant points, reference may be made to the partial description of the method embodiment.
The foregoing description has been directed to specific embodiments of this application. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art to which the embodiments of the present application pertain. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present application should be included in the scope of the claims of the present application.
Claims (9)
1. A timing control method for intersection signal lamps is characterized by comprising the following steps:
counting the retained vehicles in the retention area of the intersection lane through a data acquisition unit to obtain the quantity of the retained vehicles in the retention area;
monitoring the intersection lane through a satellite monitoring system to obtain the congestion state of the intersection lane;
according to the congestion state and the number of the detained vehicles, carrying out cycle calculation on traffic signal lamps to obtain the optimal signal cycle time;
calculating the phase green time by a data processor to obtain the maximum phase time of each phase, wherein the maximum phase time specifically comprises the phase green time;
according to
Obtaining a total set of phases in a period; wherein, P1、P2、P3、P4Respectively representing four phases of the lane of the intersection, wherein the phases represent traffic flow directions; paPhase sets for ending execution of the vehicle in the stagnation zone in one cycle, PwA phase set which is not executed in a stagnation area by a vehicle in one period;
according to
Obtaining the total number Q of the detained vehicles of all the unexecuted phasest(ii) a Wherein Q isiThe number of parked vehicles for the ith unexecuted phase,
is the sum of the ith unexecuted phase set in one cycle;
according to tp_min=tg_min+tyellowTo obtain the minimum phase time tp_min(ii) a And according to
Obtaining the actual time t of the executed ith phasei actWherein, tg_minMinimum green time, t, for each phaseyellowTime of yellow light, tdelayProlonging the green time for the unit;
according to
To obtain the maximum phase time t of the ith phasei p_max(ii) a Wherein w is the number of phases to be executed in one cycle;
and performing timing control on the traffic signal lamp according to the signal cycle time and the maximum phase time, so as to realize management on time length adjustment of the traffic signal lamp.
2. The timing control method for intersection signal lamps according to claim 1, wherein a data collector is used for collecting a stagnation area of an intersection lane to obtain the number of vehicles in the stagnation area, and the timing control method specifically comprises the following steps:
collecting the number of vehicles driving into each single lane of the detention area through an entrance data collector;
collecting the number of vehicles running out of each single lane of the detention area through an exit data collector; the inlet data acquisition unit and the outlet data acquisition unit are separated by a preset distance;
according to CRetention=CSingle lane feeding-CSingle lane exitObtaining the number C of the detained vehicles in each single lane of the detained areaRetention(ii) a Wherein, CSingle lane feedingNumber of vehicles per single lane for entering said detention zone, CSingle lane exitThe number of vehicles driving out of the corresponding single lane.
3. The timing control method for an intersection signal lamp according to claim 2, characterized by further comprising:
if two adjacent straight lanes exist in the intersection lane, connecting the entrance data collectors of the two adjacent straight lanes to obtain a total straight lane entrance data collector;
collecting the number of vehicles running into the total straight lane of the detention area through the total straight lane entrance data collector;
according to CStay in straight line=CTotal straight-through lane advance-CFirst straight-through lane exit-CSecond straight-driving laneObtaining the number C of the detained vehicles of the two adjacent straight lanes in the detaining areaStay in straight line(ii) a Wherein, CTotal straight-through lane advanceNumber of vehicles entering the general straight lane of the detention zone, CFirst straight-through lane exitNumber of vehicles exiting a first of said two adjacent straight lanes, CSecond straight-driving laneThe number of vehicles which exit the second straight lane of the two adjacent straight lanes.
4. The timing control method for an intersection signal lamp according to claim 2, characterized by further comprising:
counting the number of vehicles in the left-turn lane according to the entrance data collector and the exit data collector of the left-turn lane in the lane of the intersection to obtain the number of retained vehicles in the left-turn lane of the retention area; and the length of the boundary between the left-turn lane and the straight lane is greater than the preset distance.
5. The timing control method for an intersection signal lamp according to claim 2, characterized by further comprising:
and the outlet data acquisition unit and the inlet data acquisition unit adopt an annular coil in a camera above a lane as a sensor to count the retained vehicles in the retention area.
6. The timing control method for the intersection signal lamp according to claim 1, wherein the intersection lane is monitored through a satellite monitoring system to obtain the congestion state of the intersection lane, and the timing control method specifically comprises the following steps:
monitoring the lane of the intersection in real time according to a satellite monitoring system GPS, and calculating the sum of the key traffic flow ratios of each phase to obtain congestion state parameters;
if the congestion state parameter is less than 0.6, the congestion state is a traffic flow unsaturated state;
and if the congestion state parameter is greater than or equal to 0.6, the congestion state is a traffic flow supersaturation state.
7. The timing control method for an intersection signal lamp according to claim 1, wherein the period calculation of the traffic signal lamp is performed according to the congestion state and the number of the retained vehicles to obtain the optimal signal period time, and specifically comprises:
if the congestion state is a state of unsaturated traffic flow, the method is based on
Obtaining the optimal signal cycle time C of the unsaturated traffic flow0(ii) a Wherein, L is the total loss time of each period; y is the congestion state parameter, namely the sum of the flow rate ratios of key vehicles in each phase;
if the congestion state is a traffic flow supersaturation state, the method is based on
Obtaining the optimal signal cycle time C of the oversaturated traffic flow0Where e is the base of the natural logarithm.
8. The timing control method for the intersection signal lamp according to claim 1, wherein timing control is performed on the traffic signal lamp according to the signal cycle time and the maximum phase time, so as to realize management on time length adjustment of the traffic signal lamp, and specifically comprises:
judging the signal period and the maximum phase time through an interval judgment program to obtain an interval timing scheme matched with the lane of the intersection; the interval timing scheme is preset by a simulation experiment;
and setting the interval timing scheme through a signal machine, and adjusting the duration of the green light in the traffic signal lamp.
9. An intersection signal timing control apparatus, the apparatus comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a method of intersection signal timing control according to any one of claims 1 to 8.
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