CN104091460A - Evacuation control method and system for tree structural network - Google Patents

Abstract

The invention discloses an evacuation control method and system for a tree structural network. The evacuation control method includes the steps that the traffic capacity of each branch in the tree structural network is determined; the number of evacuation objects to be evacuated in each branch is acquired; the evacuation priority of the evacuation objects of each branch at different positions and the evacuation priority of an evacuation object set are determined in accordance with the traffic capacity and the number of the evacuation objects to be evacuated in each branch; the evacuation objects at different positions or the evacuation object set can be controlled to be subjected to evacuation through the evacuation priority sequence. By the adoption of the evacuation control method, the priority sequence of the objects to be evacuated is determined, the objects to be evacuated are evacuated in a parallel evacuation mode according to the priority sequence, evacuation can be optimally dispatched, the total evacuation time of the tree structural network system can further be shortened, and the jamming evacuation task can be completed within the minimum duration.

Description

A kind of evacuation control method and system for tree structure net

Technical field

The present invention relates to tree structure net and evacuate control field, be specifically related to a kind of evacuation control method and system for tree structure net.

Background technology

In city scope, by the road of difference in functionality, grade, position, the network architecture forming with certain density and suitable form, is referred to as road network.Wherein, the road in urban road network refers to trunk roads, secondary distributor road and branch road.The roadnet that rational in infrastructure, perfect in shape and function, capacity be enough, coordinate mutually with leading travel pattern, by the important foundation condition that is Sustainable Development for Urban Traffic System.And as index, road network is divided into tree structure road network and reticulate texture road network according to aggregation degree.

The generation of unconventional accident, often can force the public in emergent region to pass through Regional Road Network emergency evacuation to safety place, and Evacuation Strategies how to formulate complicated road network will be directly connected to the success or failure of emergency evacuation.

According to the structure and characteristics of tree structure road network, existing known Evacuation Strategies is the countermeasure of taking according to the evacuation orders of zones of different, it adopts " farthest in advance " (InFO, Innermost First Out) principle, but an important prerequisite condition of this principle is the traffic capacity that ramp capacity is greater than major trunk roads, basic and the realistic situation of this condition differs greatly, so this strategy not exclusively adapts to real condition of road surface.In addition, this strategy does not expand to network level analysis, has larger limitation.

Summary of the invention

The invention provides a kind of evacuation control method for tree structure net, to solve the problem occurring in existing road network Evacuation Strategies.

The present invention provides a kind of evacuation control system for tree structure net in addition, has larger circumscribed problem to solve in existing road network evacuation.

The invention provides a kind of evacuation control method for tree structure net, comprise, determine the traffic capacity of each branch in tree structure net; Obtain described each branch evacuation number of objects to be evacuated; According to the described traffic capacity and each branch evacuation number of objects to be evacuated, determine the evacuation object of diverse location or the evacuation priority of evacuation object set of each branch; Evacuation object or evacuation object set by described evacuation priority orders control diverse location are evacuated.

Preferably, in described definite tree structure net, the traffic capacity of each branch comprises: determine the traffic capacity according to the quantity of the evacuation object in the unit interval of each branch.

Preferably, the quantity of the evacuation object that passes through in per hour of each branch of accumulative total, is defined as the quantity of this accumulative total the traffic capacity of this branch.

Preferably, adopt counting equipment to obtain the quantity of the evacuation object that each branch is to be evacuated.

Preferably, described according to the described traffic capacity and each branch evacuation number of objects to be evacuated, the evacuation object of diverse location or the evacuation priority of evacuation object set of determining each branch comprise: determine bottleneck position and the bottleneck position residing evacuation bottleneck branch in described tree structure net, and the evacuation object of this evacuation bottleneck branch or evacuation object set are defined as to limit priority evacuation object.

Preferably, determine that limit priority evacuation object comprises: in evacuation, the longest position of required evacuation time is bottleneck position, residing the branching in described bottleneck position evacuated bottleneck branch; Evacuation object to be evacuated is evacuated position downstream by upstream position.

wherein, T ^ufor evacuation time set, tree structure net is N _tset, r _{i, j, k}for each branch, its subscript represents different branches, r _{i, j, k}the quantity that object is evacuated in branch upstream is n _{i, j, k}, the traffic capacity is c _{i, j, k}; For the r of branch arbitrarily _{i, j, k}all belong to N _tset.

Described T ^uget set in maximal value, i.e. T ^ufor required maximum evacuation time, the n obtaining _{a, b, c}, c _{a, b, c}respectively to evacuate the traffic capacity that bottleneck branch upstream is evacuated the quantity of object and evacuated bottleneck branch, correspondingly, r _{a, b, c}for evacuating bottleneck branch, p _{a, b, c}for limit priority is evacuated object.

Preferably, determine time high priority evacuation object according to definite evacuation bottleneck branch.

Alternatively, described definite high priority evacuation object comprises: according to r _{a, b, c}determine new construction net N _t', the r of this new construction net _{a, b, c}the traffic capacity of downstream branch is c _{i, j, k}deduct c _{a, b, c}.

${T^U}^{\′}=\max \left\{\frac{n_{i,j,k}^{\′}}{{\tilde{c}}_{i,j,k}^{\′}}\right\}=\frac{n_{d,e,f}^{\′}}{{\tilde{c}}_{d,e,f}^{\′}}=\frac{n_{d,e,f}^{\′}}{c_{d,e,f}^{\′}}\∀r_{i,j,k}^{\′}\∈N_t^{\′},$ Wherein T ^{u '}for the inferior priority of new construction net is evacuated object evacuation time, n _{d, e, f}, c _{d, e, f}respectively quantity and the traffic capacity that secondary bottleneck position upstream is evacuated object, correspondingly, p _{d, e, f}for inferior high priority is evacuated object.

Preferably, evacuate object and inferior high priority evacuation object according to definite limit priority, determine successively the priority orders of evacuating object.

Alternatively, described tree structure net is tree structure road network, and each branches into each section of road network, and in road network, entry position is upstream position, and exit position is downstream position, described in object to be evacuated be vehicle or the crowd on section.

Alternatively, it is characterized in that, described tree structure net is construction level tree structure net, each branches into corridor and corridor in construction level tree structure net, the corridor of the superiors' construction level and corridor are upstream position, and orlop exit position is downstream position, described in object to be evacuated be crowd.

The present invention also provides a kind of evacuation control system for tree structure net, comprising: determining unit, for determining the traffic capacity of each branch of tree structure net; Acquiring unit, for obtaining described each branch evacuation number of objects to be evacuated; Right of priority judging unit, for according to the described traffic capacity and each branch evacuation number of objects to be evacuated, determines the evacuation object of diverse location or the evacuation priority of evacuation object set of each branch; Control module, evacuates for evacuation object or the evacuation object set of the evacuation priority orders control diverse location by described.

Compared with prior art, the present invention wherein has the following advantages on the one hand: the invention provides a kind of evacuation control method for tree structure net, comprise the traffic capacity of determining each branch in tree structure net; Obtain described each branch evacuation number of objects to be evacuated; According to the described traffic capacity and each branch evacuation number of objects to be evacuated, determine the evacuation object of diverse location or the evacuation priority of evacuation object set of each branch; Evacuation object or evacuation object set by described evacuation priority orders control diverse location are evacuated.This evacuation control method is by determining object priority order to be evacuated, and evacuate object to be evacuated according to the parallel mode of evacuating of priority orders, not only can carry out optimal scheduling to evacuating, the evacuation T.T. of tree structure net system can also be shortened, the task to the evacuation of having blocked up within the shortest time can be realized.

Brief description of the drawings

Fig. 1 is the evacuation control method process flow diagram of a kind of tree structure net provided by the invention;

Fig. 2 is the structural representation of tree structure road network in the embodiment of the present invention.

Embodiment

The invention provides a kind of evacuation control method for tree structure net, the method is mainly used in tree structure net, this tree structure net is the Structure Network with multiple branches, and between each branch, has hierarchical arrangement order, and multiple branches form tree structure.Wherein, the evacuation of tree structure net is the evacuation mode from upstream position to downstream position, and upstream position is the dispersion end of tree structure net, and downstream position is the pool side of tree structure net.

Above-mentioned evacuation control method is by the evacuation object to be evacuated in each branch of tree structure net is carried out to prioritization, then evacuates according to the evacuation object of priority orders control diverse location or evacuation object set.

Fig. 1 is the evacuation control method process flow diagram of a kind of tree structure net provided by the invention.

It should be noted that, as shown in Figure 1, above-mentioned evacuation control method specifically comprises:

S1, determines the traffic capacity of each branch in tree structure net.

The described traffic capacity refers to the quantity of the evacuation object in the unit interval.Determine the traffic capacity according to the quantity of the evacuation object in the unit interval of each branch.

Particularly, can utilize the quantity of the evacuation object that each branch of counting equipment cumulative statistics passes through in unit hour, the quantity after statistics is the traffic capacity of this branch.

It should be noted that, according to aforesaid way, the traffic capacity of all branches of tree structure net is determined, and the traffic capacity statistics of all branches can be made into database, conveniently the traffic capacity of each branch of tree structure net is inquired about.Generally, the traffic capacity of each branch is outwardness, can not change, only can be because the factor such as width or length of branch causes the difference of the traffic capacity.But under special circumstances, the traffic capacity of some branches also may change.

S2, obtains described each branch evacuation number of objects to be evacuated.

Adopt counting equipment to obtain the quantity of the evacuation object that each branch is to be evacuated.

Particularly, can counting equipment be set at the afterbody of each branch of tree structure net, add up by the quantity of the evacuation object of this branch by counting equipment.

S3, according to the described traffic capacity and each branch evacuation number of objects to be evacuated, determines the evacuation object of diverse location or the evacuation priority of evacuation object set of each branch.

First, determine bottleneck position and the bottleneck position residing evacuation bottleneck branch in described tree structure net, and the evacuation object of this evacuation bottleneck branch or evacuation object set are defined as to limit priority evacuation object.

In evacuation, the longest position of required evacuation time is bottleneck position, and residing the branching in described bottleneck position evacuated bottleneck branch; Evacuation object to be evacuated is evacuated position downstream by upstream position;

wherein, T ^ufor evacuation time set, tree structure net is N _tset, r _{i, j, k}for each branch, its subscript represents different branches, r _{i, j, k}the quantity that object is evacuated in branch upstream is n _{i, j, k}, the traffic capacity is c _{i, j, k}; For the r of branch arbitrarily _{i, j, k}all belong to N _tset;

Described T ^uget set in maximal value, i.e. T ^ufor required maximum evacuation time, the n obtaining _{a, b, c}, c _{a, b, c}respectively to evacuate the traffic capacity that bottleneck branch upstream is evacuated the quantity of object and evacuated bottleneck branch, correspondingly, r _{a, b, c}for evacuating bottleneck branch, p _{a, b, c}for limit priority is evacuated object.

Secondly, determine time high priority evacuation object according to definite evacuation bottleneck branch.

Particularly, according to r _{a, b, c}determine new construction net N _t', the r of this new construction net _{a, b, c}the traffic capacity of downstream branch is c _{i, j, k}deduct c _{a, b, c};

${T^U}^{\′}=\max \left\{\frac{n_{i,j,k}^{\′}}{{\tilde{c}}_{i,j,k}^{\′}}\right\}=\frac{n_{d,e,f}^{\′}}{{\tilde{c}}_{d,e,f}^{\′}}=\frac{n_{d,e,f}^{\′}}{c_{d,e,f}^{\′}}\∀r_{i,j,k}^{\′}\∈N_t^{\′},$ Wherein T ^{u '}for the inferior priority of new construction net is evacuated object evacuation time,, n _{d, e, f}, c _{d, e, f}respectively quantity and the traffic capacity that secondary bottleneck position upstream is evacuated object, correspondingly, p _{d, e, f}for inferior high priority is evacuated object.

S4, evacuates by evacuation object or the evacuation object set of described evacuation priority orders control diverse location.

Particularly, the evacuation object of limit priority is first evacuated, and evacuates successively according to priority orders.

In order to understand more intuitively this evacuation control method, below by specific embodiment, this evacuation control method is described.

In this specific embodiment, tree structure net is tree structure road network, and particularly, described tree structure net is tree structure road network, and each branches into each section of road network, and in road network, entry position is upstream position, and exit position is downstream position.Object described to be evacuated is vehicle or the crowd on section.

Under accident background, if it is clear and definite to evacuate destination, wagon flow often unidirectional converging travel, if only consider Entrance ramp, and ignore exit ramp, normal road network can be exchanged into tree structure road network N _t.

Fig. 2 is the structural representation of tree structure road network in the embodiment of the present invention.

As shown in Figure 2, three grades of road networks that formed by major trunk roads, subsidiary road and branch road of sign.Each section on road network all has following characteristics:

The first, the traffic capacity in single section is constant, that is, the vehicle fleet size passing through in the unit interval is constant.

The second, remove outside the head and the tail of section, there is no the inflow of wagon flow and rolling away from.

Give following coding rule to road network:

For convenience of describing, can define section, for example:

Section on major trunk roads, is respectively by downstream to upstream: r _1,0,0, r _2,0,0,, r _{i, 0,0},, r _{i, 0,0}.

With r _{i, 0,0}section on the subsidiary road connecting, is respectively by downstream to upstream: r _{i, 1,0}, r _{i, 2,0},, r _{i, j, 0},, r _{i, J, 0}.

With r _{i, j, 0}section on the branch road connecting, is respectively by downstream to upstream: r _{i, j, 1}, r _{i, j, 2},, r _{i, j, k},, r _{i, j, K}.

Definition section r _{i, j, k}the vehicle set of upstream is p _{i, j, k}, quantity is n _{i, j, k}, p _{i, j, k}common evacuation path be R _{i, j, k}:

R _{i, j, k}→ r _{i, j, k}-1 → ... → r _{i, j, 1}→ r _{i, j, 0}→ r _{i, j-1,0}→ ... → r _{i, 1,0}→ r _{i, 0,0}→ r _i-1,0,0→ ... → r _1,0,0, definition section r _{i, j, k}the traffic capacity be c _{i, j, k}.

Under above-mentioned definition background, carry out following evacuation priority and determine method, can reduce blocking up of road network.

Definite method of described priority can be carried out according to following steps:

The first, first calculate $T^U=\max \left\{\frac{n_{i,j,k}}{c_{i,j,k}}\right\}=\frac{n_{a,b,c}}{c_{a,b,c}}\∀r_{i,j,k}\∈N_t.$

The second, can be according to above-mentioned calculative determination p _{a, b, c}for thering is the vehicle colony of limit priority in evacuating.

The 3rd, then by r _{a, b, c}and section, upstream is from original road network N _tin peel off, by r _{a, b, c}the traffic capacity of downstream road section deducts c _{a, b, c}, obtain new road network N _t'.

The 4th, at new road network N _t' in, calculate time priority vehicle colony according to 1-2 step.

The 5th, by that analogy, until all identified upper priority levels of all vehicles.

It should be noted that, on all vehicles are all identified after priority level, once vehicle, by bottleneck, preferentially ensures that vehicle that priority level is high in advance when evacuation.So, can reach the shortest time that blocks up of evacuation, optimize and evacuate effect.

It should be noted that, determine p _{a, b, c}for having the concrete mode of the vehicle colony of limit priority in evacuating, and which determines that it is the rationality of the vehicle colony of limit priority.Illustrate mode as follows:

If ignore the Free-flow running time of vehicle, vehicle p _{i, j, k}evacuation time be:

Wherein ${\tilde{c}}_{i,j,k}=\min \{c_{i,j,k},c_{i,j,k-1},...,c_{i,j,0},c_{i,j-\mathrm{1,0}},...,c_{i,\mathrm{0,0}},c_{i-\mathrm{1,0,0}},...,c_{\mathrm{1,0,0}}\},$ ? for r _{i, j, k}and the bottleneck of downstream road section.

If, $\max \left\{\frac{n_{i,j,k}}{{\tilde{c}}_{i,j,k}}\right\}=\frac{n_{a,b,c}}{{\tilde{c}}_{a,b,c}}\∀r_{i,j,k}\∈N_t,$ , ${\tilde{c}}_{a,b,c}=c_{a,b,c}.$

If illustrate at r _{a, b, c}downstream, there is a r _{a ', b ', c '}, its traffic capacity c _{a ', b ', c '}< c _{a, b, c}; Because r _{a ', b ', c '}at r _{a, b, c}downstream, so n _{a ', b ', c '}>=n _{a, b, c}; So with $\max \left\{\frac{n_{i,j,k}}{{\tilde{c}}_{i,j,k}}\right\}=\frac{n_{a,b,c}}{{\tilde{c}}_{a,b,c}}$ Run counter to.

As mentioned above, if ensure p _{a, b, c}vehicle colony has five-star right of priority, and its evacuation time is: at N _tmiddle guarantee p _{a, b, c}evacuation right of priority, as: by r _{a, b, c}and section, upstream is from original road network N _tin peel off, by r _{a, b, c}the traffic capacity of downstream road section all deducts c _{a, b, c}thereby, obtain new road network N _t'.Wherein, described r _{a, b, c}downstream road section is by r _{a, b, c}walk to r _1,0,0the section of process, the set that defines these sections compositions is R _{a, b, c}).

If, $\max \left\{\frac{n_{i,j,k}^{\&prime;}}{{\tilde{c}}_{i,j,k}^{\&prime;}}\right\}=\frac{n_{d,e,f}^{\&prime;}}{{\tilde{c}}_{d,e,f,}^{\&prime;}}=\frac{n_{d,e,f}^{\&prime;}}{c_{d,e,f}^{\&prime;}}\&ForAll;r_{i,j,k}^{\&prime;}\&Element;N_t^{\&prime;},$ ? $\frac{n_{d,e,f}^{\&prime;}}{c_{d,e,f}^{\&prime;}}\&le;\frac{n_{a,b,c}}{c_{a,b,c}}.$

It should be noted that, if r _{d, e, f}∈ R _{a, b, c}, $\frac{n_{d,e,f}^{\&prime;}}{c_{d,e,f}^{\&prime;}}=\frac{n_{d,e,f}-n_{a,b,c}}{c_{d,e,f}-c_{a,b,c}},$ Due to $\frac{n_{a,b,c}}{c_{a,b,c}}\&GreaterEqual;\frac{n_{d,e,f}}{c_{d,e,f}},$ So $\frac{n_{d,e,f}^{\&prime;}}{c_{d,e,f}^{\&prime;}}=\frac{n_{d,e,f}-n_{a,b,c,}}{c_{d,e,f}-c_{a,b,c}}\&le;\frac{n_{a,b,c}}{c_{a,b,c}};$ If $r_{d,e,f}\&NotElement;R_{a,b,c},$ ? $\frac{n_{d,e,f}^{\&prime;}}{c_{d,e,f}^{\&prime;}}=\frac{n_{d,e,f}}{c_{d,e,f}}\&le;\frac{n_{a,b,c}}{c_{a,b,c}}.$

As mentioned above, if ensure pd, e, f vehicle colony has the p of being only second to _{a, b, c}second advanced right of priority, its evacuation time is: $T_{d,e,f}=\frac{n_{d,e,f}}{c_{d,e,f}}\&le;T_{a,b,c}=\frac{n_{a,b,c}}{c_{a,b,c}}.$

So analogize, carry out prioritization can to all vehicle colonies, the vehicle colony that priority is high preferentially evacuates.

The whole road network total evacuation time is $\max \left\{\frac{n_{i,j,k}}{{\tilde{c}}_{i,j,k}}\right\}=\frac{n_{a,b,c}}{{\tilde{c}}_{a,b,c}}=\frac{n_{a,b,c}}{c_{a,b,c}}\&ForAll;r_{i,j,k}\&Element;N_t.$

Above-mentioned tree structure road network is evacuated control method, first can be according to the length of its evacuation time, evacuation capacity to tree structure road network is assessed, in addition, also can carry out Methodistic evacuation according to the priority orders of definite vehicle colony, can evacuate and carry out optimal scheduling road network, and, also can the bottleneck of road network be identified and be adjusted.The scheme of the method is the scheme of the rational optimum of making according to real road situation, meet real road conditions completely, meanwhile, road network is really expanded to network level analysis by the method, not only can carry out overall evacuation capacity assessment by road network, can also be to determining optimal scheduling scheme.

It should be noted that, this tree structure net can be also construction level tree structure net, and each branches into corridor and corridor in construction level tree structure net, and the corridor of the superiors' construction level and corridor are upstream position, orlop exit position is downstream position, described in object to be evacuated be crowd.

Particularly, in this construction level, each room can be set as the branch of the bottom of tree structure net, the corridor of every one deck can be set as the branch of high one deck of diverse location, corridor between floor can be set as the branch of high one deck again, and the branch of different stage can form tree structure net.

In the time of construction level generation emergency, can complete according to the evacuation control method of above-mentioned tree structure net personnel's evacuation.

The present invention also provides a kind of evacuation control system for tree structure net, comprises determining unit, acquiring unit, right of priority judging unit and control module.

It should be noted that, described determining unit is for determining the traffic capacity of each branch of tree structure net.

Described acquiring unit is for obtaining described each branch evacuation number of objects to be evacuated.

Described right of priority judging unit is used for according to the described traffic capacity and each branch evacuation number of objects to be evacuated, and determines the evacuation object of diverse location or the evacuation priority of evacuation object set of each branch.

Described control module is evacuated by evacuation object or the evacuation object set of described evacuation priority orders control diverse location.

This system can also comprise Terminal Service unit, and this Terminal Service unit is arranged to be evacuated on object, can obtain and identify the priority orders of the definite evacuation object of described control center.

Above-mentioned evacuation control system is, in conjunction with evacuating control method, a complete control system is set, this system can be assessed the evacuation capacity of tree structure net, can also carry out optimal scheduling to the evacuation of this tree structure net, and can the bottleneck of tree structure net be identified and be adjusted, reach that to evacuate used time of blocking up the shortest, there is optimum evacuation effect.

Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can make possible variation and amendment, therefore protection scope of the present invention should be as the criterion with the scope that the claims in the present invention were defined.

Claims (12)

1. for an evacuation control method for tree structure net, it is characterized in that, comprise,

Determine the traffic capacity of each branch in tree structure net;

Obtain described each branch evacuation number of objects to be evacuated;

According to the described traffic capacity and each branch evacuation number of objects to be evacuated, determine the evacuation object of diverse location or the evacuation priority of evacuation object set of each branch;

Evacuation object or evacuation object set by described evacuation priority orders control diverse location are evacuated.

2. the evacuation control method for tree structure net according to claim 1, is characterized in that, in described definite tree structure net, the traffic capacity of each branch comprises:

Determine the traffic capacity according to the quantity of the evacuation object in the unit interval of each branch.

3. the evacuation control method for tree structure net according to claim 2, is characterized in that, the quantity of the evacuation object that passes through in per hour of each branch of accumulative total is defined as the quantity of this accumulative total the traffic capacity of this branch.

4. the evacuation control method for tree structure net according to claim 1, is characterized in that, adopts counting equipment to obtain the quantity of the evacuation object that each branch is to be evacuated.

5. the evacuation control method for tree structure net according to claim 1, it is characterized in that, described according to the described traffic capacity and each branch evacuation number of objects to be evacuated, determine that the evacuation object of diverse location of each branch or the evacuation priority of evacuation object set comprise:

Determine bottleneck position and the bottleneck position residing evacuation bottleneck branch in described tree structure net, and the evacuation object of this evacuation bottleneck branch or evacuation object set are defined as to limit priority evacuation object.

6. the evacuation control method for tree structure net according to claim 5, is characterized in that, determines that limit priority evacuation object comprises:

In evacuation, the longest position of required evacuation time is bottleneck position, and residing the branching in described bottleneck position evacuated bottleneck branch; Evacuation object to be evacuated is evacuated position downstream by upstream position;

wherein, T ^ufor the evacuation time of limit priority evacuation object in tree structure net, tree structure net is N _tset, r _{i, j, k}for each branch, its subscript represents different branches, r _{i, j, k}the quantity that object is evacuated in branch upstream is n _{i, j, k}, the traffic capacity is c _{i, j, k}; For the r of branch arbitrarily _{i, j, k}all belong to N _tset;

Described T ^uget set in maximal value, i.e. T ^ufor required maximum evacuation time, the n obtaining _{a, b, c}, c _{a, b, c}respectively to evacuate the traffic capacity that bottleneck branch upstream is evacuated the quantity of object and evacuated bottleneck branch, correspondingly, r _{a, b, c}for evacuating bottleneck branch, p _{a, b, c}for limit priority is evacuated object.

7. the evacuation control method for tree structure net according to claim 6, is characterized in that, determines time high priority evacuation object according to definite evacuation bottleneck branch.

8. the evacuation control method for tree structure net according to claim 7, is characterized in that, described definite high priority evacuated object and comprised:

According to r _{a, b, c}determine new construction net N _t', the r of this new construction net _{a, b, c}the traffic capacity of downstream branch is c _{i, j, k}deduct c _{a, b, c};

${T^U}^{\&prime;}=\max \left\{\frac{n_{i,j,k}^{\&prime;}}{{\tilde{c}}_{i,j,k}^{\&prime;}}\right\}=\frac{n_{d,e,f}^{\&prime;}}{{\tilde{c}}_{d,e,f}^{\&prime;}}=\frac{n_{d,e,f}^{\&prime;}}{c_{d,e,f}^{\&prime;}}\&ForAll;r_{i,j,k}^{\&prime;}\&Element;N_t^{\&prime;},$ Wherein T ^{u '}for the inferior priority of new construction net is evacuated object evacuation time, n _{d, e, f}, c _{d, e, f}respectively quantity and the traffic capacity that secondary bottleneck position upstream is evacuated object, correspondingly, pd, e, f is that time high priority is evacuated object.

9. the evacuation control method for tree structure net according to claim 8, is characterized in that, evacuates object and inferior high priority evacuation object according to definite limit priority, determines successively the priority orders of evacuating object.

10. according to the evacuation control method for tree structure net described in claim 1-9 any one, it is characterized in that, described tree structure net is tree structure road network, and each branches into each section of road network;

In road network, entry position is upstream position, and exit position is downstream position;

Object described to be evacuated is vehicle or the crowd on section.

11. according to the evacuation control method for tree structure net described in claim 1-9 any one, it is characterized in that, described tree structure net is construction level tree structure net, and each branches into corridor and corridor in construction level tree structure net;

The corridor of the superiors' construction level and corridor are upstream position, and orlop exit position is downstream position;

Object described to be evacuated is crowd.

12. 1 kinds of evacuation control system for tree structure net, is characterized in that, comprising:

Determining unit, for determining the traffic capacity of each branch of tree structure net;

Acquiring unit, for obtaining described each branch evacuation number of objects to be evacuated;

Right of priority judging unit, for according to the described traffic capacity and each branch evacuation number of objects to be evacuated, determines the evacuation object of diverse location or the evacuation priority of evacuation object set of each branch;

Control module, evacuates for evacuation object or the evacuation object set of the evacuation priority orders control diverse location by described.