CN107123279B - Intersection signal timing scheme evaluation method in saturated state - Google Patents
Intersection signal timing scheme evaluation method in saturated state Download PDFInfo
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Abstract
The invention provides an evaluation method of an intersection signal timing scheme in a saturated state, belonging to the technical field of traffic control, and the method comprises the steps of obtaining measured values of evaluation indexes before and after optimization of the intersection signal timing scheme in the saturated state; calculating the difference value of the evaluation indexes before and after optimization on each phase of the intersection according to the measured values of the evaluation indexes before and after optimization of the timing scheme; and evaluating the optimization direction of the signal timing scheme according to the difference value before and after the optimization of the evaluation index on each phase of the intersection. According to the invention, the difference value before and after the optimization of the evaluation indexes of different flow directions of each inlet channel is calculated according to the measured values of the evaluation indexes before and after the optimization of the signal timing scheme, and each flow direction of the intersection corresponds to the signal phase scheme, so that the difference value of the evaluation indexes under different phases is obtained, the optimization direction of each phase can be clearly indicated, the optimization step length is obtained, and the signal timing scheme is optimized according to the optimization direction of each phase.
Description
Technical Field
The invention relates to the technical field of traffic control, in particular to an intersection signal timing scheme evaluation method in a saturated state.
Background
In cities, intersections are throats of urban traffic, and signal timing control is used as one of intersection control modes and is widely applied to various intersections in cities. However, in practical application, some problems often occur in the signal timing scheme, which causes low traffic efficiency at the intersection, and therefore the signal timing scheme needs to be evaluated.
However, the existing signal timing scheme evaluation method has obvious disadvantages: firstly, the evaluation of the effect of the intersection signal timing scheme is mainly focused on the evaluation result after the signal timing scheme is implemented, but the optimization direction of the signal timing scheme cannot be given. Secondly, the existing signal timing scheme evaluation method has the problems of too many selected indexes, too many evaluation indexes, mutual intersection of the evaluation indexes, unobtrusive important indexes and the like. Thirdly, the existing signal timing scheme evaluation method does not consider the traffic state of the intersection, and the evaluation result is inaccurate.
Disclosure of Invention
The invention aims to provide an intersection signal timing scheme evaluation method in a saturated state, which evaluates the intersection signal timing scheme and provides an optimization direction of the signal timing scheme.
In order to realize the purpose, the invention adopts the technical scheme that: the method for evaluating the intersection signal timing scheme in the saturated state comprises the following steps:
acquiring measured values of evaluation indexes before and after optimization of an intersection signal timing scheme in a saturated state;
calculating the difference value of the evaluation indexes before and after optimization on each phase of the intersection according to the measured values of the evaluation indexes before and after optimization of the timing scheme;
and evaluating the optimization direction of the signal timing scheme according to the difference value before and after the optimization of the evaluation index on each phase of the intersection.
Compared with the prior art, the invention has the following technical effects: according to the invention, the difference value before and after the optimization of the evaluation indexes of different flow directions of each inlet channel is calculated according to the measured values of the evaluation indexes before and after the optimization of the signal timing scheme, and each flow direction of the intersection corresponds to the signal phase scheme, so that the difference value of the evaluation indexes under different phases is obtained, the optimization direction of each phase can be clearly indicated, the optimization step length is obtained, and the signal timing scheme is optimized according to the optimization direction of each phase.
Drawings
Fig. 1 is a schematic flow chart of a method for evaluating a signal timing scheme in a saturation state according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating the subdivision step of step S2 according to an embodiment of the present invention;
fig. 3 is a schematic flow chart illustrating the evaluation of the optimization direction of the signal timing scheme in an embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating another method for evaluating an optimized direction of a signal timing scheme according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of another method for evaluating a signal timing scheme in a saturation state according to an embodiment of the present invention;
fig. 6 is a schematic flow chart of another method for evaluating a signal timing scheme in a saturation state according to an embodiment of the present invention;
fig. 7 is a schematic flow chart of another method for evaluating a signal timing scheme in a saturation state according to an embodiment of the present invention;
fig. 8 is a schematic overall flow chart of another method for evaluating a signal timing scheme in a saturation state according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to fig. 1 to 8.
As shown in fig. 1, the present embodiment provides an intersection signal timing scheme evaluation method in a saturated state, which includes the following steps S1 to S3:
s1, acquiring measured values of evaluation indexes before and after optimization of the intersection signal timing scheme in the saturated state;
s2, calculating the difference value before and after optimization of the evaluation index on each phase of the intersection according to the measured values of the evaluation index before and after optimization of the timing scheme;
and S3, evaluating the optimization direction of the signal timing scheme according to the difference value before and after the optimization of the evaluation index on each phase of the intersection.
The signal timing scheme evaluation method in the embodiment obtains the difference value of the evaluation indexes on different phases by combining the signal phase information of the intersection according to the measured values of the evaluation indexes before and after optimization, thereby providing an optimization direction for the optimization of the signal timing scheme.
Specifically, as shown in fig. 2, step S2 in the present embodiment specifically includes the following subdivided steps S21 to S22:
s21, calculating differences before and after optimization of the evaluation indexes in different flow directions of each entrance channel of the intersection according to the measured values of the evaluation indexes before and after optimization of the signal timing scheme;
and S22, corresponding the flow direction of each entrance lane of the intersection with each phase of the intersection based on the vehicle release scheme in the signal timing scheme to obtain the difference value before and after the optimization of the evaluation index on each phase.
The signal timing scheme evaluation index is selected from traffic parameters, and the evaluation index in the embodiment is preferably queue length or traffic flow or occupancy.
Specifically, the calculation method of the difference before and after the optimization of the evaluation index on each phase in step S22 is specifically:
wherein, Delta (r)iEvaluation index difference, delta (r), of phase i before and after optimization for signal timing schemeijAnd d, optimizing the evaluation index difference of the flow direction j in the phase i before and after the signal timing scheme is optimized, wherein n is the total flow direction included in the phase i.
For example, if the queuing length is selected as an evaluation index of the signal timing scheme, the calculation formula of the difference value of the queuing lengths of the phases at the intersection before and after the optimization of the signal timing scheme is as follows:
Δ(q)ioptimizing a queuing length difference, Δ (q), of a front and a rear phase i for a signal timing schemeijAnd optimizing the queuing length difference of the flow direction j in the front phase i and the rear phase i for the signal timing scheme. Wherein, Δ (q) is the difference of queue length before and after the optimization of the signal timing scheme, and Δ (q) ═ qafter-qbefore，qafterQueue length, q, optimized for signal timing schemebeforeThe pre-queue length is optimized for the signal timing scheme.
Specifically, as shown in fig. 3, the evaluating the optimization direction of the signal timing scheme in step S3 in the foregoing embodiment specifically includes the following steps S31 to S34:
s31, judging whether the number of the phases with the difference value larger than zero before and after the optimization of the evaluation index in each phase is larger than 1;
s32, if the number of phases with the difference value larger than zero before and after the optimization of the head time interval in each phase is larger than 1, acquiring the current optimization times of the signal timing scheme;
s33, judging whether the current optimization times of the signal timing scheme are greater than a preset time u 1;
it should be noted that u1 is a constant, and in this embodiment, the value of u1 is 3 as a preferred scheme, and the detailed flow is shown in fig. 3.
And S34, if the number of times is not more than the preset number of times u1, evaluating the optimization direction of the signal timing scheme according to the difference value before and after the optimization of the evaluation indexes on each phase.
It should be noted that, if the number of phases in which the difference before and after the queue length optimization is greater than zero in each phase is not greater than 1 or the current optimization time of the signal timing scheme is greater than the preset time u1, no feedback optimization is performed, and the evaluation process is ended.
Here, the following description will be given by taking the example of how to give the optimization direction of the signal timing scheme according to the difference between the queue lengths before and after the signal timing scheme is optimized by selecting the queue length as an evaluation index: and if the queuing length difference of a certain phase before and after optimization is larger than zero, feeding back an instruction for increasing the green time of the phase to the signal timing optimization program, and otherwise, not feeding back.
As shown in fig. 4, the present embodiment provides another evaluation method for intersection signal timing schemes in a saturated state, which uses queue length and intersection delay as evaluation indexes based on the disclosure of the above embodiment, and at this time, step S3 further includes the following sub-steps S35 to S38 based on the above embodiment:
s35, when judging that the number of the phases with the difference value before and after the optimization of the evaluation index in each phase is larger than zero is equal to 1, judging the average delay difference value delta (d) of the intersectionGeneral assemblyWhether the value of (d) is greater than zero;
s36, if the average delay difference value delta (d) of the intersectionGeneral assemblyIf the value of the time sequence is greater than zero, acquiring the current optimization times of the signal timing scheme;
s37, judging whether the signal timing scheme optimization times are greater than a preset time u 2;
and S38, if the number of times is not more than the preset number of times u2, evaluating the optimization direction of the signal timing scheme according to the difference value before and after the optimization of the evaluation indexes on each phase.
Here, the preset number of times u2 is a constant, and a value of 3 is preferable in this embodiment.
In addition, if the difference value before and after the total delay optimization of the intersection in each phase is smaller than zero or the current optimization times of the signal timing scheme is larger than the preset times u2, the feedback optimization is not carried out, and the evaluation process is ended.
Specifically, the intersection average delay difference Δ (d) hereGeneral assemblyThe calculation method is as follows:
wherein, Delta (d)General assemblyOptimizing mean delay difference, delta (d), at front and back crossings for signal timing schemesijAnd optimizing the jth flow direction vehicle distance delay difference value of the ith inlet lane of the front and rear intersections for a signal timing scheme, wherein N is the number of the inlet lanes of the intersections, M is the flow direction quantity of each inlet lane of the intersections, and N is the total flow direction contained in the phase i. Wherein Δ (d) ═ dafter-dbeforeDelta (d) is the difference between the delays of the intersection before and after the optimization of the signal timing scheme, dafterDelay at intersection after optimization of signal timing scheme, dbeforeAnd the intersection delay before the signal timing scheme is optimized.
In the embodiment, the change value of the delay of the intersection before and after the optimization of the signal timing scheme is used as the auxiliary judgment of the evaluation result feedback, and the feedback is terminated until the queuing length difference values of all the phases in the signal timing scheme are less than zero or the iteration times are reached. Therefore, the condition of misjudgment during optimization feedback by adopting a single evaluation index is avoided, the optimization feedback of the signal timing scheme is more scientific and accurate, the accuracy of the optimization direction evaluation of the signal timing scheme is improved, and the specific flow is shown in fig. 5.
As shown in fig. 6, after the above steps S34 and S38, a step S39 is further included:
s39, according to the optimization direction of the signal timing scheme, the signal timing scheme is optimized and then the step S1 is executed.
In the embodiment, the signal timing scheme is optimized in real time, and the optimized signal timing scheme is subjected to optimization direction evaluation, so that the optimal signal timing scheme is finally obtained through the cyclic feedback.
As shown in fig. 7 to 8, after the above step S3, a step S4 is further included:
and S4, evaluating the overall effect of the optimized signal timing scheme according to the average delay of the intersection.
The calculation method of the average delay of the intersection comprises the following steps:
wherein the content of the first and second substances,
the average delay at the intersection is the average delay,
the distance to the j-th inlet lane for the intersection is delayed.
The method specifically comprises the following steps of evaluating the overall effect of the optimized signal timing scheme:
calculating the average delay of the intersection according to the average delay of each inlet channel of the intersection in each flow direction;
and searching the range of the average delay of the intersection in a preset effect evaluation standard, and determining the overall effect of the optimized signal timing scheme.
The preset evaluation criteria for the effects are shown in table 1:
TABLE 1
Specifically, in this embodiment, after the signal timing scheme is optimized, the intersection average delay is used to evaluate the overall effect of the optimized signal timing scheme, because the intersection delay can reflect the blocked condition of the vehicle at the intersection, the service level at the intersection is comprehensively reflected. By evaluating the overall effect of the optimized signal timing scheme, the optimization effect of the signal timing scheme can be judged visually.
Claims (6)
1. A method for evaluating an intersection signal timing scheme in a saturated state is characterized by comprising the following steps:
s1, acquiring measured values of evaluation indexes before and after optimization of the intersection signal timing scheme in the saturated state;
s2, calculating the difference value before and after optimization of the evaluation index on each phase of the intersection according to the measured values of the evaluation index before and after optimization of the timing scheme;
s3, evaluating the optimization direction of the signal timing scheme according to the difference value before and after the optimization of the evaluation index on each phase of the intersection;
wherein, the evaluation index is a queuing length or a traffic flow or an occupancy, and the evaluating the optimization direction of the signal timing scheme in the step S3 specifically includes:
s31, judging whether the number of the phases with the difference value larger than zero before and after the optimization of the evaluation index in each phase is larger than 1;
s32, if yes, acquiring the current optimization times of the signal timing scheme and executing the step S33; if not, when the number of the phases with the difference value larger than zero before and after the optimization of the evaluation index in each phase is equal to 0, the evaluation process is ended, and when the number of the phases with the difference value larger than zero before and after the optimization of the evaluation index in each phase is equal to 1, the average delay difference value delta (d) of the intersection is judgedGeneral assemblyWhether the value of (d) is greater than zero;
if the crossing average delay difference value delta (d)General assemblyIf the value of the time difference is larger than zero, acquiring the current optimization times of the signal timing scheme and executing the step a; otherwise, the evaluation process is ended;
a. judging whether the current optimization times of the signal timing scheme is greater than a preset time u 2;
b. if the number of times is not more than the preset number of times u2, evaluating the optimization direction of the signal timing scheme according to the difference value before and after the evaluation index optimization on each phase, otherwise, finishing the evaluation process;
s33, judging whether the current optimization times of the signal timing scheme are greater than a preset time u 1;
and S34, if the number of times is not more than the preset number of times u1, evaluating the optimization direction of the signal timing scheme according to the difference value before and after the optimization of the evaluation indexes on each phase, otherwise, finishing the evaluation process.
2. The method according to claim 1, wherein the step S2 specifically includes:
s21, calculating differences before and after optimization of the evaluation indexes in different flow directions of each entrance channel of the intersection according to the measured values of the evaluation indexes before and after optimization of the signal timing scheme;
and S22, corresponding the flow direction of each entrance lane of the intersection with each phase of the intersection based on the vehicle release scheme in the signal timing scheme to obtain the difference value before and after the optimization of the evaluation index on each phase.
3. The method according to claim 2, wherein the calculation of the difference before and after optimization of the evaluation index at each phase in step S22 is specifically:
wherein, Delta (r)iEvaluation index difference, delta (r), of phase i before and after optimization for signal timing schemeijAnd d, optimizing the evaluation index difference of the flow direction j in the phase i before and after the signal timing scheme is optimized, wherein n is the total flow direction included in the phase i.
4. The method of claim 1, further comprising, after step S34 and step b:
s39, according to the optimization direction of the signal timing scheme, the signal timing scheme is optimized and then the step S1 is executed.
5. The method of claim 4, after the step S3, further comprising:
and S4, evaluating the overall effect of the optimized signal timing scheme according to the average delay of the intersection.
6. The method of claim 5, wherein evaluating the overall effect of the optimized signal timing scheme comprises:
s41, calculating the average delay of the intersection according to the average delay of each entrance lane of the intersection in each flow direction;
s42, searching the range of the average delay of the intersection in a preset effect evaluation standard, and determining the overall effect of the optimized signal timing scheme.
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