CN107123279A - Intersection signal timing schemes evaluation method under saturation state - Google Patents
Intersection signal timing schemes evaluation method under saturation state Download PDFInfo
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- CN107123279A CN107123279A CN201611240684.8A CN201611240684A CN107123279A CN 107123279 A CN107123279 A CN 107123279A CN 201611240684 A CN201611240684 A CN 201611240684A CN 107123279 A CN107123279 A CN 107123279A
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- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
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- G08G1/08—Controlling traffic signals according to detected number or speed of vehicles
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Abstract
The present invention provides intersection signal timing schemes evaluation method under a kind of saturation state, belongs to technical field of traffic control, and this method includes obtaining the measured value of evaluation index before and after intersection signal timing scheme optimization under saturation state；According to the measured value of evaluation index before and after the timing scheme optimization, the difference before and after evaluation index optimization in each phase in intersection is calculated；According to the difference before and after evaluation index optimization in each phase in the intersection, the optimization direction of signal time distributing conception is evaluated.The present invention passes through the measured value according to the evaluation index before and after signal time distributing conception optimization, calculate the difference before and after the evaluation index optimization of each entrance driveway difference flow direction, and respectively flow to intersection corresponding with the progress of signal phase scheme, so as to obtain the difference of evaluation index under out of phase, the optimization direction of each phase can be explicitly pointed out, obtain optimizing step-length, signal time distributing conception is optimized according to the optimization direction of each phase.
Description
Technical field
The present invention relates to technical field of traffic control, intersection signal timing scheme is commented under more particularly to a kind of saturation state
Valency method.
Background technology
In city, intersection is the throat of urban transportation, and signal timing dial control is used as the one of Intersection Controlling Fashion
Kind, it is widely used in all kinds of intersections in city.But, signal time distributing conception often occurs that some are asked in practical application
Topic, causes intersection traffic efficiency not high, it is therefore desirable to evaluate signal time distributing conception.
But, there is obvious shortcoming in existing signal time distributing conception evaluation method：One is, at present for intersection signal
The evaluation of timing scheme works, which is focused primarily upon, provides the evaluation result after signal time distributing conception is implemented, and can not but provide signal and match somebody with somebody
When scheme optimization direction.Two are, the index selected in existing signal time distributing conception evaluation method is excessive, there is evaluation index
Excessively, evaluation index intersects and the problems such as important indicator can not be protruded.Three are, existing signal time distributing conception evaluation side
Method does not account for the traffic behavior of intersection, and evaluation result is inaccurate.
The content of the invention
It is an object of the invention to provide intersection signal timing schemes evaluation method under a kind of saturation state, to intersecting
Mouth signal time distributing conception provides the optimization direction of signal time distributing conception while evaluation.
To realize object above, the technical solution adopted by the present invention is：Intersection signal under a kind of saturation state is provided to match somebody with somebody
When schemes evaluation method, this method includes：
Obtain the measured value of evaluation index before and after intersection signal timing scheme optimization under saturation state；
According to the measured value of evaluation index before and after the timing scheme optimization, evaluation index in each phase in intersection is calculated excellent
Difference before and after changing；
According to the difference before and after evaluation index optimization in each phase in the intersection, the optimization side of signal time distributing conception is evaluated
To.
Compared with prior art, there is following technique effect in the present invention：The present invention according to signal time distributing conception by optimizing
The measured value of front and rear evaluation index, calculates the difference before and after the evaluation index optimization of each entrance driveway difference flow direction, and will intersect
Each flow direction of mouth is corresponding with the progress of signal phase scheme, so as to obtain the difference of evaluation index under out of phase, can explicitly point out each
The optimization direction of individual phase, obtains optimizing step-length, signal time distributing conception is optimized according to the optimization direction of each phase.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of signal time distributing conception evaluation method under saturation state in one embodiment of the invention；
Fig. 2 is the schematic flow sheet of the fine division step of step S2 in one embodiment of the invention；
Fig. 3 is the schematic flow sheet for evaluating signal time distributing conception optimization direction in one embodiment of the invention；
Fig. 4 is another schematic flow sheet for evaluating signal time distributing conception optimization direction in one embodiment of the invention；
Fig. 5 is the flow signal of signal time distributing conception evaluation method under another saturation state in one embodiment of the invention
Figure；
Fig. 6 is the flow signal of signal time distributing conception evaluation method under another saturation state in one embodiment of the invention
Figure；
Fig. 7 is the flow signal of signal time distributing conception evaluation method under another saturation state in one embodiment of the invention
Figure；
Fig. 8 is that the overall flow of signal time distributing conception evaluation method under another saturation state in one embodiment of the invention is shown
It is intended to.
Embodiment
With reference to Fig. 1 to Fig. 8, the present invention is described in further detail.
As shown in figure 1, present embodiments providing intersection signal timing schemes evaluation method, the party under a kind of saturation state
Method includes following step S1 to S3：
S1, the measured value for obtaining evaluation index before and after intersection signal timing scheme optimization under saturation state；
Evaluate and refer in S2, the measured value according to evaluation index before and after the timing scheme optimization, the calculating each phase in intersection
Difference before and after mark optimization；
S3, according in each phase in the intersection evaluation index optimize before and after difference, evaluate signal time distributing conception it is excellent
Change direction.
Signal time distributing conception evaluation method in the present embodiment passes through the measured value according to the evaluation index before and after optimization, knot
The signal phase information of intersection is closed, the difference of evaluation index in out of phase is obtained, so as to be the optimization of signal time distributing conception
There is provided optimization direction.
Specifically, as shown in Fig. 2 the step S2 in the present embodiment specifically includes following fine division step S21 to S22：
S21, the measured value according to evaluation index before and after signal time distributing conception optimization, calculate each entrance driveway in intersection not cocurrent flow
Difference before and after upward evaluation index optimization；
S22, based on vehicle clearance scheme in signal time distributing conception, by each of the flow direction of each entrance driveway in intersection and intersection
Phase is corresponded to, and obtains the difference before and after evaluation index optimization in each phase.
Wherein, signal time distributing conception evaluation index here is chosen from traffic parameter, the evaluation index in the present embodiment
Preferably queue length or the magnitude of traffic flow or occupancy.
Specifically, the calculation of the difference in each phase in above-mentioned steps S22 before and after evaluation index optimization, specifically
For：
Wherein, Δ (r)iPhase i evaluation index difference, Δ (r) before and after optimizing for signal time distributing conceptionijFor signal timing dial
J evaluation index difference is flowed to before and after scheme optimization in phase i, n is the flow direction sum that phase i is included.
Such as, if exemplified by selecting queue length as the evaluation index of signal time distributing conception, signal time distributing conception is excellent
The mathematic interpolation formula of each phase queue length in intersection is before and after changing：Δ(q)iFor signal timing dial
Phase i queue length difference, Δ (q) before and after scheme optimizationijJ row is flowed to before and after optimizing for signal time distributing conception in phase i
Team's length difference.Wherein, Δ (q) is the difference of queue length before and after signal time distributing conception optimizes, Δ (q)=qafter-qbefore,
qafterQueue length after optimizing for signal time distributing conception, qbeforeQueue length before optimizing for signal time distributing conception.
Specifically, as shown in figure 3, evaluating the optimization direction of signal time distributing conception in step S3 in above-described embodiment, tool
Body comprises the following steps S31 to S34：
S31, judge whether the number for the phase that the difference before and after the optimization of evaluation index in each phase is more than zero is more than 1；
If the number that difference is more than zero phase before and after time headway optimization in S32, each phase obtains institute more than 1
State the optimization number of times of signal time distributing conception currently；
S33, judge the optimization number of times of the signal time distributing conception currently whether be more than preset times u1；
By u1 values it is 3 preferably specific stream in the present embodiment it should be noted that u1 here is constant
Journey refers to Fig. 3.
If S34, no more than preset times u1, the difference before and after being optimized according to evaluation index in each phase is evaluated
The optimization direction of signal time distributing conception.
If it should be noted that the number for the phase that difference is more than zero is little before and after queue length optimization in each phase
It is more than preset times u1 in 1 or the current optimization number of times of signal time distributing conception, then without feedback optimized, evaluation procedure knot
Beam.
Here it is long to the queuing before and after how being optimized according to signal time distributing conception to select queue length as evaluation index
Illustrated exemplified by degree difference, the optimization direction for providing signal time distributing conception：If the queue length of certain phase before and after optimization
Difference is more than zero, then being fed back to signal timing optimization program increases the instruction of the phase green time, conversely, then without anti-
Feedback.
As shown in figure 4, present embodiments providing intersection signal timing schemes evaluation method, the party under another saturation state
Method is on the basis of above-described embodiment disclosure, using queue length and intersection delay as evaluation index, now, upper
State on the basis of embodiment, step S3 also includes following fine division step S35 to S38：
When S35, the number for the phase for being more than zero in the front and rear difference of evaluation index optimization in judging each phase are equal to 1, sentence
Break off a friendship prong mean delay Δ (d)AlwaysValue whether be more than zero；
If S36, intersection mean delay Δ (d)AlwaysValue be more than zero, then obtain current excellent of the signal time distributing conception
Change number of times；
S37, judge signal time distributing conception optimization number of times whether be more than preset times u2；
If S38, no more than preset times u2, the difference before and after being optimized according to evaluation index in each phase is evaluated
The optimization direction of signal time distributing conception.
It should be noted that preset times u2 here is constant, preferably value is 3 in the present embodiment.
If in addition, difference is less than zero before and after the optimization of intersection total delay in each phase or signal time distributing conception is current
Optimization number of times be more than preset times u1, then without feedback optimized, evaluation procedure terminates.
Specifically, intersection mean delay difference DELTA (d) hereAlwaysCalculation be：Wherein, Δ (d)AlwaysThe mean delay of intersection is poor before and after optimizing for signal time distributing conception
Value, Δ (d)ijThe spacing of intersection the i-th entrance driveway jth flow direction is delayed difference before and after optimizing for signal time distributing conception, and M is to intersect
The number of mouth entrance driveway, N is the quantity that flows to of each entrance driveway in intersection, and n is the flow direction sum that phase i is included.Wherein, Δ
(d)=dafter-dbefore, Δ (d) is the difference of intersection delay before and after signal time distributing conception optimizes, dafterFor signal timing dial
Intersection delay after scheme optimization, dbeforeIntersection delay before optimizing for signal time distributing conception.
The changing value of intersection delay is anti-as evaluation result before and after the present embodiment optimizes by using signal time distributing conception
The auxiliary judgment of feedback, until the queue length difference of all phases is respectively less than zero in signal time distributing conception, or reaches iteration time
Number, then feedback termination.So avoid to optimize situation about judging by accident during feedback using single evaluation index, make pair
Signal time distributing conception optimization feedback more science is accurate, improves the accuracy that signal time distributing conception optimization direction is evaluated, specifically
Flow referring to Fig. 5.
As shown in fig. 6, also including step S39 after above-mentioned steps S34 and step S38：
S39, the optimization direction according to signal time distributing conception, perform step S1 after being optimized to signal time distributing conception.
The present embodiment is carried out by being optimized in real time to signal time distributing conception, and to the signal time distributing conception after optimization
Optimize direction to evaluate, so circulation feedback is so as to finally give optimal signal time distributing conception.
As shown in Fig. 7 to 8, after above-mentioned steps S3, in addition to step S4：
S4, according to intersection mean delay, the whole structure of the signal time distributing conception after optimization is evaluated.
Here the calculation of intersection mean delay is：Wherein,For intersection
Mean delay,The spacing delay flowed to for intersection the i-th entrance driveway jth.
Wherein, the whole structure of the signal time distributing conception after optimization is evaluated, specifically includes following steps：
According to mean delay of each entrance driveway in intersection in each flow direction, the mean delay of intersection is calculated；
Scope where searching the mean delay of the intersection in default effect assessment standard, it is determined that after optimization
The whole structure of signal time distributing conception.
Default effect assessment standard at this is as shown in table 1：
Table 1
Specifically, in the present embodiment after being optimized to signal time distributing conception, using intersection mean delay to optimization
The whole structure of signal time distributing conception afterwards is evaluated, because intersection delay can reflect be obstructed feelings of the vehicle in intersection
Condition, concentrated expression goes out the service level of intersection.Evaluated by the whole structure to the signal time distributing conception after optimization, energy
Intuitively judge the effect of optimization of signal time distributing conception.
Claims (9)
1. intersection signal timing schemes evaluation method under a kind of saturation state, it is characterised in that comprise the following steps：
S1, the measured value for obtaining evaluation index before and after intersection signal timing scheme optimization under saturation state；
S2, the measured value according to evaluation index before and after the timing scheme optimization, calculate evaluation index in each phase in intersection excellent
Difference before and after changing；
S3, according in each phase in the intersection evaluation index optimize before and after difference, evaluate signal time distributing conception optimization side
To.
2. the method as described in claim 1, it is characterised in that the step S2 is specifically included：
S21, the measured value according to evaluation index before and after signal time distributing conception optimization, are calculated in each entrance driveway difference flow direction in intersection
Evaluation index optimization before and after difference；
S22, based on vehicle clearance scheme in signal time distributing conception, by the flow direction of each entrance driveway in intersection and each phase of intersection
Corresponded to, obtain the difference before and after evaluation index optimization in each phase.
3. method as claimed in claim 1 or 2, it is characterised in that described evaluation index is queue length or the magnitude of traffic flow
Or occupancy.
4. method as claimed in claim 3, it is characterised in that in each phase in the step S22 before evaluation index optimization
The calculation of difference afterwards, be specially：
Wherein, △ (r)iPhase i evaluation index difference, △ (r) before and after optimizing for signal time distributing conceptionijFor signal time distributing conception
J evaluation index difference is flowed to before and after optimization in phase i, n is the flow direction sum that phase i is included.
5. method as claimed in claim 3, it is characterised in that the optimization side of signal time distributing conception is evaluated in the step S3
To specifically including：
S31, judge whether the number for the phase that the difference before and after the optimization of evaluation index in each phase is more than zero is more than 1；
If the number that difference is more than zero phase before and after time headway optimization in S32, each phase obtains the letter more than 1
Number optimization number of times of timing scheme currently；
S33, judge the optimization number of times of the signal time distributing conception currently whether be more than preset times u1；
If S34, no more than preset times u1, the difference before and after being optimized according to evaluation index in each phase evaluates signal
The optimization direction of timing scheme.
6. method as claimed in claim 5, it is characterised in that described evaluation index also includes intersection delay, the step
Rapid S3 also includes：
When S35, the number for the phase for being more than zero in the front and rear difference of evaluation index optimization in judging each phase are equal to 1, judge to hand over
Prong mean delay △ (d)AlwaysValue whether be more than zero；
If S36, intersection mean delay △ (d)AlwaysValue be more than zero, then obtain the optimization of the signal time distributing conception currently time
Number；
S37, judge signal time distributing conception optimization number of times whether be more than preset times u2；
If S38, no more than preset times u2, the difference before and after being optimized according to evaluation index in each phase evaluates signal
The optimization direction of timing scheme.
7. the method as described in claim 5 or 6, it is characterised in that also include after the step S34 and step S38：
S39, the optimization direction according to signal time distributing conception, perform step S1 after being optimized to signal time distributing conception.
8. method as claimed in claim 7, it is characterised in that after the step S3, in addition to：
S4, according to intersection mean delay, the whole structure of the signal time distributing conception after optimization is evaluated.
9. method as claimed in claim 8, it is characterised in that the whole structure of the signal time distributing conception after described pair of optimization enters
Row is evaluated, and is specifically included：
S41, the mean delay according to each entrance driveway in intersection in each flow direction, calculate the mean delay of intersection；
S42, search the mean delay of the intersection in default effect assessment standard where scope, it is determined that optimization after
The whole structure of signal time distributing conception.
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Cited By (1)
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