CN102637364A - Adaptive signal method capable of avoiding deadlock of intersection and device - Google Patents
Adaptive signal method capable of avoiding deadlock of intersection and device Download PDFInfo
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Abstract
The invention provides an adaptive signal method capable of avoiding deadlock of an intersection and a device, which relate to the field of intelligent traffic. The method includes acquiring the number of vehicles at the intersection and the vehicle speed of an exit section in a current traffic direction; and switching the phase of an intersection signal into the phase of a temporary signal when the number of the vehicles at the intersection is larger than a threshold value and the vehicle speed of the exit section is lower than a threshold value. The phase of the temporary signal includes prohibiting vehicles in the current traffic direction from running into the intersection and prohibiting traffic in a vehicle flow direction conflicting with the current traffic direction. Whether the phase of the temporary signal needs to be switched in or not is determined by means of judging the number of the vehicles at the intersection and the vehicle speed of the exit section corresponding to the traffic signal, the traffic in the vehicle flow direction conflicting with the current traffic direction is prohibited within the phase of the temporary signal, accumulation of the vehicles at the intersection is avoided, deadlock of the intersection is stopped, traffic efficiency of the intersection is improved, urban traffic jam is relieved, and traffic accident rate is reduced.
Description
Technical field
The application relates to intelligent transportation field, particularly relates to a kind of self-adapting signal method and apparatus of avoiding the intersection deadlock.
Background technology
The urban road grade crossing causes wagon flow to interrupt owing to receive signal lamp control, and the traffic capacity will be lower than the traffic capacity in highway section, is the main bottleneck of urban transportation.Formulating effective traffic signal control strategy is the important means that ensures the traffic safety of intersection and give full play to the traffic efficiency of intersection.Along with the traffic detection technique constantly improve and to the deep understanding of traffic flow moving law; The development course that is controlled to adaptive control by timing controlled, induction has been experienced in the control of single cross cross road mouth signal; Traffic signals have been adapted to by the demand of Passive Control to the ACTIVE CONTROL developing direction; Progressively by simple type to intelligent excessively, improved the control benefit of intersection.
Along with the explosive growth of transport need, the city traffic is in hypersaturated state basically.At this moment, highway section density is big, and flow is low.The vehicle queue that causes that blocks up on the highway section very easily extends to the intersection; After the signal lamp phase transition, vehicle does not also have emptying in the intersection, and other direction wagon flows get into the intersection and but can not pass through smoothly; Cause in the intersection vehicle cumulative, deadlock finally takes place.Though when clearly getting congestion in the regulation intersection in the traffic law, vehicle No entry intersection, this regular subjective factor is strong, and generally speaking, as long as signal lamp is a green light, vehicle just gets into the intersection.
Deadlock situation takes place through regular meeting in the morning and evening peak period in Beijing.Under deadlock state, the flow of intersection is 0, causes the local traffic paralysis, seriously reduces the traffic efficiency of whole road network.And deadlock generation in a single day, must manual intervention could remove, the time that deadlock continues is long more, and the traffic congestion that causes is serious more.The signal control method of intersection deadlock is avoided in formulation, is to improve intersection capacity under the hypersaturated state, the important measures that improve the operational efficiency of road network.
Existing intersection signal control method generally adopts the timing signal method of adjustment; In magnitude of traffic flow rush hour; As long as signal lamp is green light, vehicle also all can unconfined entering intersection, causes existing method can not effectively avoid the generation of deadlock state.
Summary of the invention
The application's technical matters to be solved provides a kind of self-adapting signal method and apparatus of avoiding the intersection deadlock; Avoid vehicle in the intersection, to accumulate; Thereby stop the generation of intersection deadlock; Improve intersection passing efficient, alleviate urban traffic blocking, and reduce the traffic hazard incidence.
In order to address the above problem, the application discloses a kind of Adaptive Signal Control method of avoiding the intersection deadlock, comprising:
Obtain the intersection vehicle number and with the speed of a motor vehicle of rolling the highway section away from of current current direction;
The speed of a motor vehicle of rolling the highway section away from greater than threshold value and said when said intersection vehicle number is during less than threshold value, with intersection signal phase incision temporary signal phase place; Said temporary signal phase place comprises that the vehicle of forbidding current current direction sails the intersection into and forbids that producing the wagon flow direction of conflicting with current current direction passes through.
Preferably, described temporary signal phase place also comprises:
Allowing not produce the wagon flow direction of conflicting with current current direction passes through.
Preferably, when said intersection vehicle number was not more than threshold value and the said speed of a motor vehicle of rolling the highway section away from and threshold value such as is not less than, the intersection signal phase was controlled by the normal signal phase place.
Preferably, described intersection comprises T type crossing and crossroad.
Accordingly, the application discloses a kind of Adaptive Signal Control device of avoiding the intersection deadlock, comprising:
The information of vehicles deriving means, be used to obtain the intersection vehicle number and with the speed of a motor vehicle of rolling the highway section away from of current current direction;
Sig-nal-conditioning unit, the speed of a motor vehicle that is used for rolling the highway section when said intersection vehicle number away from greater than threshold value and said are during less than threshold value, with intersection signal phase incision temporary signal phase place; Said temporary signal phase place comprises that the vehicle of forbidding current current direction sails the intersection into and forbids that producing the wagon flow direction of conflicting with current current direction passes through.
Preferably, described temporary signal phase place also comprises:
Allowing not produce the wagon flow direction of conflicting with current current direction passes through.
Preferably, when said intersection vehicle number was not more than threshold value and the said speed of a motor vehicle of rolling the highway section away from and threshold value such as is not less than, the intersection signal phase was controlled by the prearranged signals phase place.
Preferably, described intersection comprises T type crossing and crossroad.
Preferably, described information of vehicles deriving means comprises Loop Vehicle Detector; Said sig-nal-conditioning unit comprises teleseme.
Compared with prior art, the application comprises following advantage:
The application increases a temporary signal phase place on the basis of original phase place; The speed of a motor vehicle of rolling the highway section accordingly away from through judgement and right of way signal to vehicle number in the intersection judges whether to get into this temporary signal phase place; Forbid that in this temporary signal phase place producing the wagon flow direction of conflicting with current current direction passes through, promptly forbid to get into the vehicle that crowded queuing highway section takes place and get into the intersection, avoid vehicle in the intersection, to accumulate; Thereby stop the generation of intersection deadlock; Improve intersection passing efficient, alleviate urban traffic blocking, and reduce the traffic hazard incidence.
Description of drawings
Fig. 1 is a kind of schematic flow sheet of avoiding the self-adapting signal method of intersection deadlock of the application;
Fig. 2 is the preferred schematic flow sheet of self-adapting signal method that the application avoids the intersection deadlock;
Fig. 3 a is the preferred cross junction Adaptive Signal Control of a application method synoptic diagram;
Fig. 3 b is four phase places of the preferred cross junction timing signal of the application control method;
Fig. 4 is the application's vehicle queue timing controlled and adaptive control flow evolution diagram in time when extending to cross junction;
Fig. 5 is the variation of the application's cross junction signal lamp state when adopting the self-adaptation control method avoid deadlock;
Crossing flow and vehicle sailed probability and the graph of a relation that rolls probability away from into when Fig. 6 a was the control of employing timing signal;
Crossing flow and vehicle sailed probability and the graph of a relation that rolls probability away from into when Fig. 6 b was employing the application institute extracting method;
Fig. 7 is the preferred T-junction mouth of a application Adaptive Signal Control method synoptic diagram;
Fig. 8 is three phase places of the preferred T-junction mouth of the application timing signal control method;
Fig. 9 is the application's vehicle queue timing controlled and adaptive control flow evolution diagram in time when extending to the T-junction mouth;
Figure 10 is the variation of the application's T-junction mouth signal lamp state when adopting the self-adaptation control method avoid deadlock;
Crossing flow and vehicle sailed probability and the graph of a relation that rolls probability away from into when Figure 11 a was the control of employing timing signal;
Crossing flow and vehicle sailed probability and the graph of a relation that rolls probability away from into when Figure 11 b was employing the application institute extracting method.
Embodiment
For above-mentioned purpose, the feature and advantage that make the application can be more obviously understandable, the application is done further detailed explanation below in conjunction with accompanying drawing and embodiment.
With reference to Fig. 1, show a kind of schematic flow sheet of avoiding the self-adapting signal method of intersection deadlock of the application, comprising:
For the vehicle that gets into the intersection, can obtain through the difference that detects its car number that sails into and roll away from.Such as: to detect the vehicle that sails the intersection into be 50 cars in the highway section of sailing into of the vehicular circulation direction of intersection; Rolling the highway section away from, to detect the vehicle that rolls the intersection away from be 42 cars; Also the vehicle number in the intersection is 50-42=8 car so, at this moment.
For the speed of a motor vehicle of vehicle, the application need obtain the speed of a motor vehicle of rolling the highway section away from of current current direction.This speed of a motor vehicle can judge whether roll the highway section away from passes through normal.
In reality, the sailing the highway section into and roll the highway section away from an information of vehicles deriving means is set respectively of each current direction, with obtain the intersection vehicle number and with the speed of a motor vehicle of rolling the highway section away from of current current direction.Such as through Loop Vehicle Detector, detect the vehicle number and the speed of a motor vehicle of rolling the highway section vehicle away from, and the magnetic test coil of Loop Vehicle Detector is more accurate ground to the statistics of vehicle number, therefore can have good effect.Certainly also available other equipment obtain the intersection vehicle number and with the speed of a motor vehicle of rolling the highway section away from of current current direction.
In the reality, different vehicles amount threshold and the speed of a motor vehicle threshold value of rolling the highway section away from can be set to dissimilar intersections.Such as for certain right-angled intersection; The current highway section of its intersection is long; Then can be provided with its threshold value bigger, such as, if the current highway section of certain intersection is grown 60 meters; Then can be according to the physical length of vehicle and vehicle, the vehicle threshold value that can be set in this intersection is 20.If long 30 meters of the current highway section of certain intersection then can be according to the physical length of vehicle and vehicle, the vehicle threshold value that can be set in this intersection is 10.This vehicle threshold value can obtain according to actual count.
Generally can be set to less than 2m/s or littler for the speed of a motor vehicle of rolling the highway section away from.The deadlock reason of intersection is general because the velocity ratio that current direction is rolled the highway section away from is lower; Thereby cause in time to roll away from from sailing the vehicle that sails in the highway section into; Thereby cause vehicle accumulation in the intersection, therefore be traditionally arranged to be the low speed about 2m/s for the speed of a motor vehicle of rolling the highway section away from.
When said intersection vehicle number greater than threshold value, the simultaneously said speed of a motor vehicle of rolling the highway section away from is indicating that promptly the intersection gets into deadlock state probably during less than threshold value, writes down the phase place of current demand signal lamp this moment; With intersection signal phase incision temporary signal phase place; Said temporary signal phase place comprises that the vehicle of forbidding current current direction sails the intersection into and forbids that producing the wagon flow direction of conflicting with current current direction passes through.Described temporary signal phase place comprises that also allowing not produce the wagon flow direction of conflicting with current current direction passes through.So, then can avoid making the vehicle that conflicts with current current direction generation get into the intersection because of the timing redirect green light of normal signal for the current restriction of the vehicle that conflicts with current current direction generation, thus produce of deadlock.Allow not produce the wagon flow direction of conflicting simultaneously and pass through, then can alleviate the traffic burden with current current direction.
In addition, when said intersection vehicle number was not more than threshold value and the said speed of a motor vehicle of rolling the highway section away from and threshold value such as is not less than, the intersection signal phase was controlled by the normal signal phase place.After being the alarm release of deadlock, can the temporary signal phase place be removed, return original signal phase and carry out magnitude of traffic flow control.
Can be in reality through teleseme according to the relation of said intersection vehicle number and threshold value with saidly roll the speed of a motor vehicle in highway section away from and the relation of threshold value is controlled signal phase.
With reference to Fig. 2, it shows the more concrete a kind of schematic flow sheet of avoiding the self-adapting signal method of intersection deadlock of the application.
Calculate the vehicle number and the speed of a motor vehicle of rolling the highway section away from the crossing;
Judge whether deadlock will take place according to said method; If not, then continue the speed of a motor vehicle calculating the vehicle number in the crossing and roll the highway section away from, then if the current phase place of tracer signal lamp is then cut interim phase place;
Calculate the vehicle number and the speed of a motor vehicle of rolling the highway section away from the crossing;
Judge it is to finish interim phase place according to said method; If, then do not continue to calculate the vehicle number and the speed of a motor vehicle of rolling the highway section away from the crossing; If, then finish interim phase place, cut the normal phase place of people.
With reference to Fig. 3 a, it shows the synoptic diagram of the preferred right-angled intersection Adaptive Signal Control of the application method.Wherein, 1 expression Loop Vehicle Detector; 2 expression signal machines; 3 expression signal lamps, 4 expression crossings; 4 highway sections of 5 expression right-angled intersections; 6 expression intersections.
Right-angled intersection is connected with highway section on the four direction, on four direction, sails the highway section respectively into and rolls the highway section away from.Four wagon flows of sailing on the highway section receive signal lamp control.With four direction that right-angled intersection links to each other on respectively sail the highway section into and all bury the toroid winding detecting device on the highway section underground with rolling away from, in order to obtain flow and the speed information that gets into and sail out of the intersection.Sail the highway section into for being positioned at the upper reaches, intersection, a highway section of sailing the intersection into of buying car in installments; Roll the highway section away from for being positioned at the downstream, intersection, a highway section of rolling the intersection away from of buying car in installments.Detecting device is connected through optical cable with teleseme, transmits each link flow and speed information to teleseme in real time.Control module in the teleseme is handled these information; Obtain and sail the intersection vehicle flowrate into and roll the intersection vehicle flowrate away from, the vehicle flowrate that sails the intersection into accumulation deducts accumulation and rolls the vehicle flowrate of intersection away from and obtain vehicle number in the current intersection; Obtain and roll the highway section equal speed of levelling of getting on the bus away from, if speed less than a certain critical value, then the crowded queuing on this highway section has extended to the intersection.Teleseme carries out anticipation according to the wagon flow state on each highway section to deadlock, changes the signal lamp state.
In reality, when signal phase is in normal four phase places, if vehicle number is in the normal range and (is not more than a certain critical value N in the intersection
Max), the speed of a motor vehicle of rolling the highway section away from is obviously greater than 0 (generally more than or equal to 2m/s), and signal lamp carries out conversion according to fixing four phase places so;
If vehicle number too much (surpasses a certain critical value N in the intersection
Max), and roll non-intersection speed away near 0 (being generally less than 2m/s), get into the temporary signal phase place so, and confirm each signal lamp state of temporary signal phase place according to getting into temporary signal phase place front blinker state and crowded highway section of lining up taking place.
Wherein, Signal lamp control principle is for become red light with current current directional signal light in advance; Forbid that needs get into the vehicle that crowded queuing highway section takes place and get into the intersection, another one is current constant to the signal lamp state, and the wagon flow directional signal light that will not conflict becomes green light.When signal phase is in interim phase place, if vehicle number reduces to below a certain critical value N* in the intersection, finish the temporary signal phase place so, enter into next timing signal control phase.Such as being green light, when other directions are red light, detect in the intersection vehicle number greater than N in thing craspedodrome direction
Max, and the east side rolls non-intersection speed away from and approaches 0, get into interim phase place after, the west direction of keeping straight on eastwards becomes red light, east orientation south left-hand rotation direction becomes green light; When vehicle number is not more than N* in detecting the intersection, finish the temporary signal phase place, east orientation west craspedodrome direction is a red light, and the west direction of northwards turning left becomes green light.
With reference to Fig. 3 b, it shows preferably original four phase places of right-angled intersection timing signal control method of the application.Phase place I is that east-west direction is kept straight on; Phase place II is that east-west direction turns left; Phase place III is that North and South direction is kept straight on; Phase place IV is that North and South direction is turned left.
The speed information that teleseme rolls the highway section away from according to vehicle number information and current direction in the intersection that obtains is controlled the highway section signal lamp state that gets congestion and line up; Realization enters into the temporary signal phase place by the normal signal phase place, and turns back to the conversion of normal signal phase place by the temporary signal phase place.
Specific as follows: (1) is detected the queuing back that blocks up according to velocity information and is overflow to the highway section of crossroad mouth.The highway section of sailing into of foundation and intersection adjacency obtains to sail into intersection and the vehicle number that rolls the intersection away from the detecting device that rolls away from the highway section, deducts and rolls the intersection vehicle number away from and just obtain vehicle number N in the current intersection with sailing the intersection vehicle number into
cIf N
c＞N
Max(N
MaxBe the vehicle number threshold value), and detect a certain non-intersection speed that rolls away from and approach 0 (being generally less than 2m/s), overflowing after the queuing that causes of blocking up has so extended to the intersection.The record speed of a motor vehicle approaches 0 highway section numbering, is designated as i, and at this moment, highway section i gets congestion, and needs restriction upper reaches wagon flow to sail highway section i into.Here N
MaxThe maximum vehicle number that allows in the expression intersection.
(2) get into the temporary signal phase place, and confirm each signal lamp state.If be the craspedodrome phase place this moment, highway section, the upper reaches craspedodrome direction green light of highway section i becomes red light so, and the direction of keeping straight in the opposite direction green light is constant, and left-hand rotation direction red light becomes green light.If be left turn phase this moment, the left turn traffic signal lamp that gets into highway section i so becomes red light by green light.Write down the intersection simultaneously and get into residing phase place before the temporary signal phase place, so that the temporary signal phase place directly enters into next phase place when finishing.
(3) in the temporary signal phase place, the signal lamp state transformation.If vehicle number N in the intersection
c＜N* finishes the temporary signal phase place so, and enters into next phase place.Critical vehicle number when N* representes to finish the temporary signal phase place here in the intersection, and satisfy N*＜N
MaxIf N
c＞N* continues the temporary signal phase state, obtains and respectively rolls the highway section car speed away from, if the speed of a motor vehicle, explains that this highway section gets congestion near 0 (less than 2m/s), the signal lamp that gets into this upper reaches, highway section wagon flow is set to red light.
In addition, surpass 1 minute if the intersection is in the time of temporary signal phase place, send signal from trend traffic control center, traffic control center in time sends to the patrol traffic police with this information, directs traffic so that the traffic police arrives in corresponding intersection rapidly.
For the validity of the signal control strategy of avoiding the crossing deadlock that proposed of checking, single cross prong shown in Figure 2 is carried out analogue simulation, setting four of being connected with the crossing, to sail the highway section rate of inflow into be α, unit/second; The rate of outflow that rolls the highway section away from right side, crossing is β
1, other roll the highway section rate of outflow away from is β, unit/second.Left turning vehicle ratio 0.2 on each highway section, right-hand rotation vehicle ratio 0.2, through vehicles ratio 0.6.120 seconds signal periods, craspedodrome green light duration 40 seconds, left-hand rotation green light duration 20 seconds.
With reference to Fig. 4, be the application's vehicle queue timing controlled and adaptive control flow evolution diagram in time when extending to cross junction.Get α=0.5, β
1=0.05, β=1.0.The figure illustrates the fluctuations in discharge of crossing per minute under two kinds of various signals control strategy conditions.Can find that when adopting timing signal control, flow finally is reduced to 0.In initial a few minutes, blocking up does not extend to the crossing, and flow is unaffected; After t=6 minute, flow begins to reduce; When t＞14 minute, flow is reduced to 0, and deadlock has taken place in the crossing.
With reference to Fig. 5, the variation diagram of signal lamp state when it shows the preferred right-angled intersection of the application and adopts the self-adaptation control method of avoiding deadlock.
The figure illustrates the situation of change that adopts each travel direction signal lamp state when avoiding crossing deadlock signal controlling scheme.In two initial cycles, blocking up does not also extend to the crossing, and the signal lamp state changes according to the timing controlled scheme.At t=356 during second, the west signal lamp of keeping straight on eastwards becomes red light by green light, and east orientation south left rotaring signal lamp becomes green light by red light.The west green time of keeping straight on eastwards is very short, and east orientation west green time is elongated with the southern green time of east orientation.
With reference to Fig. 6 a and Fig. 6 b, it shows the application's right-angled intersection flow and vehicle sails probability and the relation of rolling probability away from into.
The figure illustrates crossing flow and vehicle and sail probability α and the relation of rolling probability β away from into.This moment, fixedly to roll probability away from be 0.05 to highway section, right side, crossing.When sailing probability into when rolling probability away from, do not form the highway section bottleneck that blocks up, the crossing flow is linear growth, the value of reaching capacity subsequently with the increase of sailing flow into.Along with the increase of rolling probability away from, the value of saturation volume also increases.When adopting timing signal control, roll the generation that probability hour can cause deadlock away from, the crossing flow is 0.When the deadlock signal controlling is avoided in employing, roll probability away from when very little, the crossing also can keep certain flow.Through relatively can finding,, when just the highway section gets congestion, avoid the deadlock signal controlling can obtain bigger flow rolling probability away from hour; Rolling probability away from when big, the highway section can not get congestion, and the flow that two kinds of signal controlling schemes are obtained does not have difference.Can find out that by above result the Adaptive Signal Control method of avoiding the crossing deadlock that is proposed can effectively be avoided the generation of crossing deadlock, improve the traffic efficiency of crossing under the hypersaturated state.
With reference to Fig. 7, it shows the synoptic diagram of the preferred T type of the application crossing Adaptive Signal Control method.Represented same Fig. 2 of implication of numeral among the figure.T type crossing links to each other branch road with main road, on each highway section the track be provided with inconsistent, among Fig. 7 with letter and combination of numbers in order to distinguish.s
1The expression branch road rolls the highway section away from; s
2The expression branch road sails the highway section into; s
3And s
5Roll the highway section away from the expression main road; s
4The highway section of sailing into that has left turn lane on the expression main road; s
6The highway section of sailing into that does not have left turn lane on the expression main road.
The T-junction crossing connects main road and bypass, has three to sail highway section and three into and roll the highway section away from, and three are sailed into the highway section wagon flow and receive signal controlling.Sail the highway section into for two on the main road and have asymmetry, one has left turn lane, and another does not have left turn lane.Similar with cross junction, all bury the toroid winding detecting device on the highway section underground with rolling away from respectively sailing the highway section into, in order to obtain flow and the speed information that gets into and sail out of the intersection.The same cross junction of the connection of detecting device, teleseme and other devices.To the anticipation rule of crossing deadlock, control such as signal principle is consistent with cross junction, just on concrete transformation rule of signal lamp and control method, there are differences.
With reference to Fig. 8, it shows preferably original three phase places of T-junction crossing timing signal control method of the application.Phase place I is that the main road wagon flow is kept straight on; Phase place II is that the main road wagon flow is turned left; Phase place III is that the branch road wagon flow is turned left.
The T-junction effected enters into the temporary signal phase place by the normal signal phase place, and it is specific as follows to turn back to the transformation rule of normal signal phase place by the temporary signal phase place:
(1) detecting the queuing back that blocks up according to velocity information overflows to the highway section of crossroad mouth.The highway section of sailing into of foundation and intersection adjacency obtains to sail into intersection and the vehicle number that rolls the intersection away from the detecting device that rolls away from the highway section, deducts and rolls the intersection vehicle number away from and just obtain vehicle number N in the current intersection with sailing the intersection vehicle number into
cIf N
c＞N
Max(N
MaxBe the vehicle number threshold value), and detect a certain non-intersection speed that rolls away from and approach 0 (being generally less than 2m/s), overflowing after the queuing that causes of blocking up has so extended to the intersection.The record speed of a motor vehicle approaches 0 highway section numbering, is designated as i, and at this moment, highway section i gets congestion, and needs restriction upper reaches wagon flow to sail highway section i into.Here N
MaxThe maximum vehicle number that allows in the expression intersection.
(2) get into the temporary signal phase place, and confirm each signal lamp state.Signal is in phase place I: if highway section i is s
3, so to highway section s
6The craspedodrome wagon flow sends out a warning, to highway section s
4Left turn traffic gives a green light; If highway section i is s
5, so to highway section s
4The craspedodrome wagon flow sends out a warning.Signal is in phase place II: if highway section i is s
1, so to highway section s
4Left turn traffic sends out a warning, to highway section s
4The craspedodrome wagon flow gives a green light.Signal is in phase place III: if highway section i is s
5, so to highway section s
2Left turn traffic sends out a warning, to highway section s
6The craspedodrome wagon flow gives a green light.
(3) in the temporary signal phase place, the signal lamp state transformation.If vehicle number N in the intersection
c＜N* finishes the temporary signal phase place so, and enters into next phase place.Critical vehicle number when N* representes to finish the temporary signal phase place here in the intersection, and satisfy N*＜N
MaxIf N
c＞N* continues the temporary signal phase state, obtains and respectively rolls the highway section car speed away from, if the speed of a motor vehicle, explains that this highway section gets congestion near 0 (less than 2m/s), the signal lamp that gets into this upper reaches, highway section wagon flow is set to red light.
Through analogue simulation, can obtain being similar to the result of cross junction, the signal control method of avoiding the crossing deadlock that is proposed is equally applicable to the T-junction mouth.Setting the main road rate of inflow is α, and the branch road rate of inflow is α/2; It is β that the highway section rate of outflow is rolled on the right side, crossing away from
1, other roll the highway section rate of outflow away from is β.Main road left turn traffic ratio 0.3, right-hand rotation wagon flow ratio 0.3, branch road left turn traffic ratio 0.6, right-hand rotation wagon flow ratio 0.4.120 seconds signal periods, main road craspedodrome green light duration 60 seconds, main road left-hand rotation green light duration 30 seconds, branch road left-hand rotation green light duration 30 seconds.
With reference to Fig. 9, be the application's vehicle queue timing controlled and adaptive control flow evolution diagram in time when extending to the T-junction mouth.Get α=0.5, β
1=0.05, β=1.0.The figure illustrates the fluctuations in discharge of crossing per minute under two kinds of various signals control strategy conditions.Can find the flow of the flow during Adaptive Signal Control when timing signal is controlled.
With reference to Figure 10, the variation diagram of signal lamp state when it shows the preferred T-junction of the application crossing and adopts the self-adaptation control method avoid deadlock.
The figure illustrates the situation of change that adopts each travel direction signal lamp state when avoiding crossing deadlock signal controlling scheme.In two initial cycles, blocking up does not also extend to the crossing, and the signal lamp state changes according to the timing controlled scheme.At t=252 during second, the west signal lamp of keeping straight on eastwards becomes red light by green light, and east orientation south left rotaring signal lamp becomes green light by red light.
With reference to Figure 11 a and Figure 11 b, it shows the application's T-junction crossing flow and vehicle sails probability and the relation of rolling probability away from into.The figure illustrates crossing flow and vehicle and sail probability α and the relation of rolling probability β away from into.This moment, fixedly to roll probability away from be 0.05 to highway section, right side, crossing.When sailing probability into when rolling probability away from, do not form the highway section bottleneck that blocks up, the crossing flow is linear growth, the value of reaching capacity subsequently with the increase of sailing flow into.Along with the increase of rolling probability away from, the value of saturation volume also increases.Through relatively can finding,, when just the highway section gets congestion, avoid the deadlock signal controlling can obtain bigger flow rolling probability away from hour; Rolling probability away from when big, the highway section can not get congestion, and the flow that two kinds of signal controlling schemes are obtained does not have difference.
Disclosed herein as well is a kind of Adaptive Signal Control device of avoiding the intersection deadlock accordingly, comprising:
The information of vehicles deriving means, be used to obtain the intersection vehicle number and with the speed of a motor vehicle of rolling the highway section away from of current current direction;
Sig-nal-conditioning unit, the speed of a motor vehicle that is used for rolling the highway section when said intersection vehicle number away from greater than threshold value and said are during less than threshold value, with intersection signal phase incision temporary signal phase place; Said temporary signal phase place comprises that the vehicle of forbidding current current direction sails the intersection into and forbids that producing the wagon flow direction of conflicting with current current direction passes through.
Described temporary signal phase place also comprises: allow not produce the wagon flow direction of conflicting with current current direction and pass through.When said intersection vehicle number was not more than threshold value and the said speed of a motor vehicle of rolling the highway section away from and threshold value such as is not less than, the intersection signal phase was controlled by the prearranged signals phase place.Described intersection comprises T type crossing and crossroad.
Described information of vehicles deriving means comprises Loop Vehicle Detector; Said sig-nal-conditioning unit comprises teleseme.
For system embodiment, because it is similar basically with method embodiment, so description is fairly simple, relevant part gets final product referring to the part explanation of method embodiment.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
More than to a kind of self-adapting signal method and apparatus of avoiding the intersection deadlock that the application provided; Carried out detailed introduction; Used concrete example among this paper the application's principle and embodiment are set forth, the explanation of above embodiment just is used to help to understand the application's method and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to the application's thought, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as the restriction to the application.
Claims (9)
1. an Adaptive Signal Control method of avoiding the intersection deadlock is characterized in that, comprising:
Obtain the intersection vehicle number and with the speed of a motor vehicle of rolling the highway section away from of current current direction;
The speed of a motor vehicle of rolling the highway section away from greater than threshold value and said when said intersection vehicle number is during less than threshold value, with intersection signal phase incision temporary signal phase place; Said temporary signal phase place comprises that the vehicle of forbidding current current direction sails the intersection into and forbids that producing the wagon flow direction of conflicting with current current direction passes through.
2. method according to claim 1 is characterized in that, described temporary signal phase place also comprises:
Allowing not produce the wagon flow direction of conflicting with current current direction passes through.
3. method according to claim 1 is characterized in that:
When said intersection vehicle number was not more than threshold value and the said speed of a motor vehicle of rolling the highway section away from and threshold value such as is not less than, the intersection signal phase was controlled by the normal signal phase place.
4. method according to claim 1 is characterized in that:
Described intersection comprises T type crossing and crossroad.
5. an Adaptive Signal Control device of avoiding the intersection deadlock is characterized in that, comprising:
The information of vehicles deriving means, be used to obtain the intersection vehicle number and with the speed of a motor vehicle of rolling the highway section away from of current current direction;
Sig-nal-conditioning unit, the speed of a motor vehicle that is used for rolling the highway section when said intersection vehicle number away from greater than threshold value and said are during less than threshold value, with intersection signal phase incision temporary signal phase place; Said temporary signal phase place comprises that the vehicle of forbidding current current direction sails the intersection into and forbids that producing the wagon flow direction of conflicting with current current direction passes through.
6. device according to claim 5 is characterized in that, described temporary signal phase place also comprises:
Allowing not produce the wagon flow direction of conflicting with current current direction passes through.
7. device according to claim 5 is characterized in that:
When said intersection vehicle number was not more than threshold value and the said speed of a motor vehicle of rolling the highway section away from and threshold value such as is not less than, the intersection signal phase was controlled by the prearranged signals phase place.
8. device according to claim 5 is characterized in that:
Described intersection comprises T type crossing and crossroad.
9. device according to claim 5 is characterized in that:
Described information of vehicles deriving means comprises Loop Vehicle Detector; Said sig-nal-conditioning unit comprises teleseme.
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| CN108399760A (en) * | 2018-04-03 | 2018-08-14 | 浙江警察学院 | A kind of ground induction coil formula red time lengthening device and its method |
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