CN103186984B - Method for triggering transformation of steering function of variable guidance lanes at urban intersections - Google Patents
Method for triggering transformation of steering function of variable guidance lanes at urban intersections Download PDFInfo
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- CN103186984B CN103186984B CN201310142366.8A CN201310142366A CN103186984B CN 103186984 B CN103186984 B CN 103186984B CN 201310142366 A CN201310142366 A CN 201310142366A CN 103186984 B CN103186984 B CN 103186984B
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Abstract
The invention discloses a method for triggering transformation of a steering function of variable guidance lanes at urban intersections. The method comprises the following steps of: arrangement of two rows of coil detectors; and triggering method and flow of transformation of the steering function of the variable guidance lanes. In the method, from the most intuitive expression of the steering unbalance traffic for which the variable guidance lane is suitable, namely, each steering queuing length is obviously different, each steering queuing state and each steering queuing difference are judged according to the occupation condition of the two rows of detectors, and each steering saturation level is judged further, thus, a flow for specifically judging the transformation of the steering function of the variable guidance lane is provided, the utilization rate of the variable guidance lane is improved, the queuing length of an entrance lane is shortened, and the delay of vehicles at the intersections is reduced.
Description
Technical field
The invention belongs to road traffic control field, be specifically related to a kind of triggering method towards variable guided vehicle road turning function conversion.
Background technology
When classical signal control crossing is arranged, usually keep lane function constant, adopt signal adjustment to tackle the change of transport need.This mode can adapt to the less situation of entrance driveway each bogie car flow rate fluctuation, and for the obvious entrance driveway of those Different periods each bogie car flow rate fluctuation, often cause same-phase counter flow to cause time-space distribution waste because clearance green light transit time increases, or cause and singlely turn to wagon flow queuing long and cause and block up.Present stage, the conversion of variable guided vehicle road turning function often needs by traffic police's Real Time Observation Intersection Traffic Volume and regulates and controls, this subjective judgement often causes the conversion moment incorrect, and traffic congestion or unlawful practice also exist the low inferior problem of utilization factor simultaneously.
Existing having researched and proposed responds to the methods such as control, the control of two stop line, master, pre-signal control, but the actual execution of the flow process proposed is got up, operability is strong, and acquisition and the collection of parameter are more difficult.
Summary of the invention
The object of the invention is to propose a kind of urban intersection variable guided vehicle road turning function conversion triggering method, overcome and rely on the artificial drawback judging variable guided vehicle road conversion opportunity, improve the utilization ratio of variable guided vehicle road, shorten the queue length of entrance driveway wagon flow, reduce the delay of vehicle in crossing.
The technical solution used in the present invention is: urban intersection of the present invention variable guided vehicle road turning function conversion triggering method, detecting device Real-Time Monitoring is utilized respectively to turn to by flow and respectively turn to maximum queuing in-scope, the opportunity of choose reasonable turning function conversion, improve lane utilization ratio, reduce vehicle intersection delay, comprise the following steps:
1) laying of two detector row
1. test set J1 is laid in the broadening segment trailer at distance L1 place, entrance driveway upstream, quantity is the summation of the coil checker in import Through Lane, left turn lane, variable guided vehicle road, for detecting each track by data such as vehicle number, detecting device holding times, the traffic parameter such as obtain entrance driveway each steering flow thus, coil occupies.2. test set J2 is laid in the section, upstream that entrance driveway turns to regardless of wagon flow, and distance entrance driveway Transition length is L2, and quantity is the summation of detecting device on each track, section, judges whether long each lane flow in upstream queues up for detecting.
2) the occupied detection method of detecting device
When queuing diffuses to detecting device position, react and be long level at detecting device.Therefore, the level (level time length exceedes a certain limit value) that red interval does not continue when detecting device, illustrates that detecting device is not occupied namely to queue up and does not propagate into sensor detector.One level is set and continues limit value, Real-Time Monitoring level length, if level length exceedes limit value, illustrate that detecting device is occupied, queue up and reached detecting device position.
3) the differentiation process of variable guided vehicle road turning function generation conversion is as follows:
3.1) maximum queue length is respectively turned to judge
Note stop line be interval M1, test set J1 is interval M2, test set J2 to test set J2 to test set J1 is M3 to subsequent section.According to respectively turning between cycle maximum queuing tail of the queue location, point three kinds of queuing situations: 1. a certain queuing tail of the queue that turns to is at interval M1, and another turns to queuing tail of the queue at interval M3, is designated as zero, represents that variable guided vehicle road turning function should change; 2. two kinds turn to queuing tail of the queue in same interval, and Ji is ╳, represent that the variable guided vehicle road turning function of maintenance is constant; 3. two kinds turn to queuing team tail of the queue respectively at interval M1 and interval M2 or respectively at interval M2 and interval M3, are designated as △, represent and need by respectively turning to wagon flow saturation degree to discuss further.
3.2) saturation degree judges further
Maximum queue length difference results is △, needs, to respectively turning to saturation difference to judge further, should meet the following conditions: what 1. queue length was less turns to wagon flow saturation degree x
acertain threshold value x should be less than
l; What 2. queue length was longer turns to wagon flow saturation degree x
bcertain threshold value x should be greater than
h; 3. the difference DELTA x of both direction saturation degree should be greater than certain threshold value x
m.When above condition all meets, variable guided vehicle road turning function converts.
In the computing method of each added turning lane saturation degree and saturation degree deterministic process, threshold value determination method is as follows:
A. the calculating of saturation degree
The mean value of the traffic data collected with continuous 3 cycles for calculated value, if L
ibe the left turn traffic data obtained in the i-th cycle, T
iit is the straightgoing vehicle flow data obtained in the i-th cycle.Then nearest 3 cycle left turn traffic mean values are designated as L
i'=(L
i+ L
i-1+ L
i-2)/3, straightgoing vehicle levelling average is designated as T
i'=(T
i+ T
i-1+ T
i-2)/3.Pass through formula
calculate and respectively turn to saturation degree, wherein: j-turn to wagon flow to number, general j=1 are for turning left, and j=2 is for keeping straight on; q
j-j turns to the bicycle road vehicle flowrate of wagon flow, pcu/h; x
j-j turns to the saturation degree of wagon flow; CAP
j-j turns to the handling capacity of wagon flow, pcu/h.
B. the determination of saturation degree decision threshold
(n
j-j turns to the entrance driveway number of track-lines of wagon flow; α-correction factor, can get 0.8 ~ 0.9); 2. x
b> x
h=0.9;
(n
athe entrance driveway number of track-lines of-queue length less direction wagon flow; β-correction factor, desirable 0.8 ~ 0.9).
Beneficial effect: the 1. triggering method that the variable guided vehicle road turning function that the present invention proposes converts, two detector row are utilized to detect the queue length difference respectively turned to, in conjunction with the further judgement of saturation degree, guarantee that the conversion of variable guided vehicle road turning function can not be reduced direction wagon flow to number of track-lines and cause and have a strong impact on.
2. the variable guided vehicle road functional mapping triggering method of the present invention's proposition is simple and easy to do, rely on two detector row to judge queue length, determination methods is more reliable, effectively improves the utilization factor of variable guided vehicle road, shorten queuing difference, lower the total average traffic delay of entrance driveway.
Accompanying drawing explanation
Fig. 1 is the track distribution of entrance driveway, the position schematic diagram of numbering situation and detecting device.
Fig. 2 is be that the variable guided vehicle road turning function conversion in the crossing of example differentiates process flow diagram with Fig. 1.
Fig. 3 is that variable guided vehicle road functional mapping triggers decision flow chart.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Step 1: lay two detector row as shown in Figure 1 at entrance driveway;
Step 2: for Fig. 2,3, the current turning function point situation according to variable guided vehicle road is discussed, with a signal period for sense cycle.Just terminate using target inlet road direction control signal green light, respectively turn to when being red light as cycle detection initial time.
(1) variable guided vehicle road original state is left turn lane
1) detecting device 2 is unoccupied
Illustrate that now vehicle queue does not spread to detecting device 2 in variable guided vehicle road, detecting device 1 is also in unoccupied or low occupancy under normal circumstances, and now left turn traffic is in the initial queue stage.
If 1. detecting device 3,6 is all occupied, craspedodrome wagon flow is queued up long, then change variable guided vehicle road turning function for keeping straight on.
If 2. detecting device 3 is occupied, and detecting device 5,6 unoccupied, now keeping straight on is in queuing and spreads the stage.Now need turning to saturation degree to judge, the magnitude of traffic flow obtaining respectively by detecting device 1,2 and detecting device 3 and keep straight on, and calculate and respectively turn to saturation degree.When meeting saturation degree Rule of judgment (x
a< x
l, x
b> x
h, Δ x>=x
m), then variable guided vehicle road turning function is become craspedodrome.
2) detecting device 2 is occupied and detecting device 4 is unoccupied
Illustrate that left turn traffic queues up to have queued up and overflow broadening section, arrive transition.
If 1. now detecting device 3,6 is all occupied, illustrates that craspedodrome wagon flow is queued up and trace back, now by the volume of traffic that detecting device 1,2 and detecting device 3 obtain, calculate and respectively turn to saturation degree difference.When meeting saturation degree Rule of judgment (x
a< x
l, x
b> x
h, Δ x>=x
m), and detecting device 6 occupation rate increases or detecting device 1 occupation rate reduces, then variable guided vehicle road turning function is become craspedodrome.
If 2. detecting device 6 is unoccupied, now do not need to adjust variable guided vehicle road function.
3) detecting device 2,4 is all occupied
Now, left turn traffic is queued up and is passed up to section, does not consider that variable guided vehicle road arranges irrational situation.If detecting device 3,6 is all in occupied state, illustrate that entrance driveway all directions flow is all excessive and exceed the entrance driveway traffic capacity, the change of lane function can not bring effective improvement, should consider other control modes.
(2) variable guided vehicle road original state is Through Lane
1) detecting device 2 is unoccupied
Illustrate that now vehicle queue does not spread to detecting device 2 in variable guided vehicle road, detecting device 3 is also in unoccupied or low occupancy under normal circumstances, and now craspedodrome wagon flow is in the initial queue stage.
If 1. detecting device 1,4 is all occupied, namely left turn traffic is queued up long, then change variable guided vehicle road turning function for turning left.
If 2. detecting device 1 is occupied, and detecting device 4 is unoccupied, now turns left to be in queuing and spread the stage.Now need turning to saturation degree to judge, the magnitude of traffic flow obtaining respectively by detecting device 1 and detecting device 2,3 and keep straight on, and calculate and respectively turn to saturation degree.When meeting saturation degree Rule of judgment (x
a< x
l', x
b> x
h', Δ x>=x
m'), then variable guided vehicle road turning function is become left-hand rotation.
2) detecting device 2 is occupied and detecting device 6 is unoccupied
Illustrate that craspedodrome wagon flow queues up to have queued up and overflow broadening section, arrive transition.
If 1. now detecting device 1,4 is all occupied, illustrates that left turn traffic is queued up and trace back, now by the volume of traffic that detecting device 1 and detecting device 2,3 obtain, calculate and respectively turn to saturation degree difference.When meeting saturation degree Rule of judgment (x
a< x
l', x
b> x
h', Δ x>=x
m'), and detecting device 4 occupation rate increases or detecting device 3 reduces, then variable guided vehicle road turning function is become left-hand rotation.
If 2. detecting device 4 is unoccupied, now do not need to adjust variable guided vehicle road function.
3) detecting device 2,6 is all occupied
Now, craspedodrome wagon flow is queued up and is passed up to section, if detecting device 1,4 is all in occupied state, illustrates that entrance driveway all directions flow is all excessive and exceedes the entrance driveway traffic capacity, the change of lane function can not bring effective improvement, should consider other control modes.
Due in urban road, it is higher that the vehicle of entrance driveway arrives discreteness, and the fluctuation of wagon flow in adjacent periods is comparatively large, whether can not meet trigger condition for lane function convert foundation with the monocycle.In general observation continuous 3 cycles, if satisfy condition in consecutive periods, then change the turning function of variable guided vehicle road.
It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.The all available prior art of each ingredient not clear and definite in the present embodiment is realized.
Claims (2)
1. a urban intersection variable guided vehicle road turning function conversion triggering method, is characterized in that: comprise the following steps:
1) laying of two detector row
The entrance driveway arranging variable guided vehicle road lays two groups of detecting devices: 1. test set J1 is laid in the broadening segment trailer at distance L1 place, entrance driveway upstream, quantity is the summation of the coil checker in import Through Lane, left turn lane, variable guided vehicle road, for detecting each track by vehicle number, detecting device holding time data, each steering flow of acquisition entrance driveway, detecting device occupy traffic parameter thus; 2. test set J2 is laid in the section, upstream that entrance driveway turns to regardless of wagon flow, and distance entrance driveway Transition length is L2, and quantity is the summation of detecting device on each track, section, judges whether long each lane flow in upstream queues up for detecting;
2) the occupied detection method of detecting device
When queuing diffuses to detecting device position, react and be long level at detecting device; Therefore, the level that red interval does not continue when detecting device, illustrates that detecting device is not occupied namely to queue up and does not propagate into coil checker; One level is set and continues limit value, Real-Time Monitoring level length, if level length exceedes limit value, illustrate that detecting device is occupied, queue up and reached coil position;
3) the differentiation process of variable guided vehicle road turning function generation conversion is as follows:
3.1) maximum queue length is respectively turned to judge
Note stop line be interval M1, test set J1 is interval M2, test set J2 to test set J2 to test set J1 is M3 to subsequent section; According to respectively turning between cycle maximum queuing tail of the queue location, divide three kinds of queuing situations: 1. a certain queuing tail of the queue that turns to is at interval M1, and another turns to queuing tail of the queue at interval M3, maximum queue length difference results is designated as zero, represents that variable guided vehicle road turning function should change; 2. two kinds turn to queuing tail of the queue in same interval, and maximum queue length difference results Ji is ╳, represent that the variable guided vehicle road turning function of maintenance is constant; 3. two kinds turn to queuing team tail of the queue respectively at interval M1 and interval M2 or respectively at interval M2 and interval M3, maximum queue length difference results is designated as △, represent and need by respectively turning to wagon flow saturation degree to discuss further;
3.2) saturation degree judges further
Maximum queue length difference results is △, needs, to respectively turning to saturation difference to judge further, should meet the following conditions: what 1. queue length was less turns to wagon flow saturation degree x
acertain threshold value x should be less than
l; What 2. queue length was longer turns to wagon flow saturation degree x
bcertain threshold value x should be greater than
h; 3. the difference DELTA of both direction saturation degree
xcertain threshold value x should be greater than
m; When above condition all meets, variable guided vehicle road turning function converts.
2. urban intersection according to claim 1 variable guided vehicle road turning function conversion triggering method, is characterized in that: threshold value determination method in the computing method of each added turning lane saturation degree and saturation degree deterministic process:
2.1) calculating of saturation degree
The mean value of the traffic data collected with continuous 3 cycles for calculated value, if L
ibe the left turn traffic data obtained in the i-th cycle, T
iit is the straightgoing vehicle flow data obtained in the i-th cycle; Then nearest 3 cycle left turn traffic mean values are designated as L
i'=(L
i+ L
i-1+ L
i-2)/3, straightgoing vehicle levelling average is designated as T
i'=(T
i+ T
i-1+ T
i-2)/3; Pass through formula
calculate and respectively turn to saturation degree, wherein: j-turn to wagon flow to number, general j=1 are for turning left, and j=2 is for keeping straight on; q
j-j turns to the bicycle road vehicle flowrate of wagon flow, pcu/h; x
j-j turns to the saturation degree of wagon flow; CAP
j-j turns to the handling capacity of wagon flow, pcu/h;
2.2) determination of saturation degree decision threshold
1.
wherein: n
j-j turns to the entrance driveway number of track-lines of wagon flow; α-correction factor, gets 0.8 ~ 0.9; 2. x
b> x
h=0.9; 3.
wherein: n
athe entrance driveway number of track-lines of-queue length less direction wagon flow; β-correction factor, gets 0.8 ~ 0.9.
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| CN103186984B true CN103186984B (en) | 2015-01-07 |
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Cited By (1)
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| CN107067726A (en) * | 2017-05-28 | 2017-08-18 | 浙江大学 | It is a kind of to recognize the method that the variable guided vehicle road of crossing inlet sets suitability |
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