CN108109398A - A kind of overhead expressway Coordinated Ramp Control System and control method - Google Patents
A kind of overhead expressway Coordinated Ramp Control System and control method Download PDFInfo
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Abstract
The invention belongs to technical field of control over intelligent traffic, more particularly to a kind of city expressway Coordinated Ramp Control System and control method, including implantation of device, control induction strategies and software analysis, according to the traffic capacity condition of main line dynamic traffic bottleneck and magnitude of traffic flow conservation principle, the local method generation regulation rate with coordinating combination is taken.Each Entrance ramp transport need of balance can be played the role of by the implementation of Ramp Coordinated Control Scheme, reduce main line short distance trip proportion, final realize increases through street net traffic efficiency.
Description
Technical field
The invention belongs to technical field of control over intelligent traffic, more particularly to a kind of overhead expressway Ramp coordinates control system
System and control method.
Background technology
City expressway is mainly a large amount of, rapid transit service in city, plays a part of dominance in urban transportation.As
The sustainer of urban transportation, if through street traffic efficiency is paralysed due to congestion, the traffic in entire city will receive shadow greatly
It rings.At present, for how to regulate and control urban expressway traffic, there are numerous control methods and theory in home and abroad, including Entrance ramp control
System, the control of main line track open and close controlling, main line variable speed-limit etc..Pass through domestic various regions practice situation, through street Entrance ramp control
The theoretical operational effect of system is the most directly, significantly.
Most of On-ramp Control strategy that domestic city through street uses is timing controlled, single-point self adaptive control,
There is fraction to coordinate control using Ramp.Timing controlled disadvantage is not account for the time variation of traffic behavior, it is impossible to root
Metering rate is accordingly changed according to main line real-time traffic states；Single-point self adaptive control only considers that Partial controll strategy is optimal,
Global optimum is not considered；Ramp coordinate control need to consider the coordination between multiple Entrance ramps, due to parameter calibration is more difficult,
Enforcement difficulty is larger.The country does not build up the preferable Ramp coordination control of effect and inducible system also now.
In addition domestic traditional cities fast road ramp control program is that ring road is allowed to flow into vehicle in ring road using queuing policy
On wait in line, carry out periodical clearance using traffic lights, do not consider the acclive key issue of elevated ramp.Vehicle is in the gradient
Larger Overhead ring road parking waiting can trigger a series of problems, such as：New hand driver is in ring road parking etc.
It treats, easy car slipping causes traffic accident during hill start, induces bigger traffic congestion situation；In addition vehicle causes in ring road parking waiting
The oil consumption of vehicle and exhaust emissions can increase.
The content of the invention
The problem to be solved in the present invention is to overcome the shortcomings of background technology, provides a kind of overhead expressway Ramp and coordinates control
System and control method processed.
The present invention is a kind of overhead expressway Coordinated Ramp Control System, is achieved through the following technical solutions：One
Kind overhead expressway Coordinated Ramp Control System, including implantation of device, traffic information analysis, induction and signal control strategy certainly
Dynamic generation and execution, the implantation of device are：Bridge ring road entrance lays vehicle detection with traffic above-ground intersection on overpass
Device, bridge ring road entrance starting point lays track indicator on overpass, and bridge ring road entrance starting point lays variable feelings on overpass
Plate is reported, electronic shooting equipment is laid in bridge ring road entrance traffic light on overpass, and door frame is laid respectively on overpass main line
Formula advices plate, wagon detector lay tollgate devices respectively at the entry and exit of overpass main line both ends, the bridge circle under overpass
Road is exported with laying electronic shooting equipment at 20 meters of main line intersection upstream, and central server is laid in center monitoring computer room.
The traffic information analysis includes traffic model analysis, the analysis of section traffic flow analysis, Path selection, section congestion
Condition adjudgement, wherein：
Traffic model is analyzed：The data collected according to wagon detector carry out traffic flow three to each section of city expressway and join
The analysis of number relational model, includes speed flow models, speed-density model and flow-density model.Pass through each model point
Analysis carries out precise knowledge, for traffic certainly to each section maximum stream flow, critical speed, optimum density, the link characteristics of jam density
Dynamic control strategy provides favourable foundation；
Section traffic flow analysis：The data collected according to wagon detector, to three parameter of each road traffic delay of city expressway
The situation of changing over time is analyzed, and according to through street main line traffic flow different time sections situation of change, is counted each section and is handed over
Logical changing rule is simultaneously preserved, and carrying out short-time traffic flow forecast for system provides model foundation；
Path selection is analyzed：Vehicle information is crossed according to what tollgate devices and electronic shooting equipment collected, to vehicle to run viaduct
Footpath is analyzed, and is analyzed so as to analyze each section vehicle composition source, is provided to formulate current limliting strategy during the congestion of section
Foundation avoids blindness current limliting；
Road congestion state judges：The real-time traffic collected according to wagon detector, tollgate devices and electronic shooting equipment is believed
Breath, judges road congestion state, basis for estimation mainly includes：1st, whether section occupation rate in section downstream is more than default valve
Value；2nd, judge whether the section is hoarding the volume of traffic by upstream and downstream difference in flow, i.e., total input flow rate is more than total output flow；
3rd, the delay time that vehicle passes through specific road section.
The induction and signal control strategy are automatically generated and performed comprising three levels, be respectively traffic behavior estimate/
Prediction interval, ramp metering rate rate optimization layer and ring road direct control layer；Wherein：
Traffic behavior estimation/prediction interval：According to actual measurement traffic behavior and historical traffic status data, mould is emulated using road grid traffic
Type realizes Viaduct Network traffic flow modes short-term prediction；
Ramp metering rate rate and induction scheme optimization layer：It is up to target with Viaduct Network traffic traffic efficiency, according to prediction traffic
State solves whole ring road optimistic coordinated control regulation rates；
Ring road direct control layer：Local ring road feedback control regulation rate is calculated, and according to prediction traffic behavior and actual measurement traffic shape
The deviation of state chooses the regulation rate of ring road；If predicting that traffic behavior deviation is little, adjusted using optimistic coordinated control
Rate, otherwise using local ring road feedback control regulation rate；By the regulation rate of each ring road compared with the threshold values set, work as circle
When the regulation rate in road is more than setting threshold values, by automatically controlling ring road entrance lane indicator, closing behaviour is carried out to ring road track
Make, without periodical clearance, the induced screen of variable information board shows main line jam situation, prompting of detouring, and in addition issue is forbidden
Parking waiting is reminded, and vehicle is avoided to be had an impact in the parking waiting road pavement traffic of ring road mouth；It is set when the regulation rate of ring road is less than
When determining threshold values, by automatically controlling ring road entrance lane indicator, opening operation is carried out to ring road track, variable information board lures
It leads screen and shows main line jam situation.
Based on the control method of above-mentioned overhead expressway Coordinated Ramp Control System, including following operation：
（1）Field research is carried out to road essential information and is arranged：The basic information of road is investigated, includes through street net
Length, main line number of track-lines, lane width, Entrance ramp, exit ramp, interchange position, ring road number of track-lines and ring road it is wide
The basic information of degree, and form road network information schematic diagram；The road network magnitude of traffic flow and traffic bottlenecks point are observed, are equipment
Laying provide data support；
（2）Determine that the cloth of equipment sets up an office：Wagon detector, electronic shooting equipment, track instruction are determined according to situation is investigated early period
The laying place of the equipment such as device, variable information board, gantry type advices plate, tollgate devices, and installation and debugging are carried out, and will be above-mentioned each
Kind equipment carries out unicom by network and monitoring central server；
（3）Information gathering, analysis and the generation of dynamic aspect in real time are with issuing control：
A, to wagon detector, electronic shooting equipment, track indicator, variable information board, gantry type advices plate, tollgate devices etc.
Facility information is acquired, and according to the real time information that wagon detector detects, is judged whether each section becomes congestion points, is judged
Foundation there are three, first, section downstream section occupation rate whether be more than pre-set threshold value；Second, sentenced by upstream and downstream difference in flow
Whether the disconnected section is hoarding the volume of traffic, i.e., total input flow rate is more than total output flow；3rd, vehicle passes through specific road section
Delay time；
B, for each congested link, according to the always input of main line link flow and the principle of total output balance, by road where it
The difference of total input with the total output of section respectively associates the reduction total amount of Entrance ramp inflow traffic as its upstream, then according to setting
Weighing factor coefficient table, calculate it is each association Entrance ramp distribution flow-reduction value, flow-reduction value be each crowded section of highway
Distribute the sum of flow-reduction value；
C, optimistic coordinated control regulation rate and local ring road feedback control regulation rate are calculated；Then according to prediction traffic behavior and reality
The deviation of traffic behavior is surveyed, the regulation rate of ring road is chosen, if prediction traffic behavior deviation is little, using optimal coordination
Control and regulation rate, otherwise using local ring road feedback control regulation rate；When the regulation rate of the ring road of selection is more than setting threshold values,
Self-closed control is carried out to ring road, and closing and prompting of detouring are provided on the induced screen of variable information board；
D, Xun Huan performs above step, realizes the real-time dynamic control to Expressway Traffic.
Preferably, bridge ring road entrance and the wagon detector that traffic above-ground intersection lays are earth magnetism vehicle on above-mentioned overpass
Detector.
Above-mentioned part ring road feedback control regulation rate, which calculates, chooses ALINEA ramp metering rate algorithms.
The calculating of above-mentioned ring road optimistic coordinated control regulation rate up to optimizes mesh with Viaduct Network traffic traffic efficiency
Scalar functions according to the real-time status information for detecting, predicting and section traffic, while consider the current energy of main line bottleneck
Power enters out ramp capacity, a series of constraintss of vehicle routing choice rule, solves each ring road optimistic coordinated control tune
Section rate.
The definite principle of above-mentioned weight coefficient table is：First, its influence coefficient of the nearer ring road in distance division section is bigger；
Second, contribute the section magnitude of traffic flow its influence coefficient of more ring roads bigger.
The beneficial effects of the invention are as follows：
（1）Improve the traffic capacity of city expressway vehicle；
（2）Driver and passenger are provided with timely traffic information, improves trip service quality；
（3）Mitigate road traffic to block, reduce Automobile Transportation effect on environment；
（4）Improve the capability of fast response to accident.
Description of the drawings
Fig. 1 is the implantation of device schematic diagram of the present invention.
In figure, 1 wagon detector, 2 track indicators, 3 variable information boards, 4 electronic shooting equipment, 5 gantry type advices plates,
6 tollgate devices.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those skilled in the art are not having
All other embodiments obtained under the premise of creative work are made, belong to the scope of protection of the invention.
The present invention provides a kind of overhead expressway Coordinated Ramp Control System, including implantation of device, traffic information point
Analysis, induction and signal control strategy are automatically generated and performed, below this pair of three aspect be introduced.The implantation of device bag
It includes：Bridge ring road entrance lays wagon detector 1 with traffic above-ground intersection on overpass, and wagon detector 1 here is to vehicle
Flow, density, speed and queue length are monitored, and ramp flow and queue length are monitored to realize, for leading
The analysis of line source vehicle and ring road traffic, 1 cloth of wagon detector preferably here are set to earth magnetism wagon detector；In height
Electronic shooting equipment 4 is laid in bridge ring road entrance traffic light on bridge formation, and the illegal activities such as running red light for vehicle and hypervelocity are grabbed
It claps, plays the role of specification ring road entrance traffic；It is flowed into for ring road entrance vehicle is effectively automatically or manually controlled, on overpass
Bridge ring road entrance starting point lays track indicator 2 and variable information board 3 respectively, and track indicator 2 controls the opening and closing of ring road
System, variable information board 3 shows main line real-time traffic condition, and prompts bypass route, and the opening and closing of ring road is solved
It releases, mainly Viaduct Network is shown to graphically in the unclosed state of ring road, the induced screen of the variable information board 3 of ring road entrance
Real-time traffic states provide suggestiveness with text mode and detour induction information, and when ring road is in closed state, ring road entrance
Ramp closure reason is provided with text mode on the induced screen of variable information board 3, detours and induction information and forbids waiting in line to warn
Information is accused, shows Viaduct Network real-time traffic states to graphically；It is induced into Mobile state to realize having gone up bridge vehicle, in height
Gantry type advices plate 5 is laid on bridge formation main line, the cloth for laying gantry type advices plate 5 sets up an office in overpass ramp exit main line upstream
1 kilometer or so, the induced screen issue main line downstream real-time traffic condition of gantry type advices plate 5 is laid, shows height to graphically
Frame road network real-time traffic states, when swimming out of now larger congestion instantly, the induced screen of gantry type advices plate 5 in a manner of text information,
Induction vehicle overhead other routes that detour under in advance；To understand overhead main line traffic behavior in detail, complete real-time traffic states and lure
Information issue and the realization of Ramp coordinated control function are led, wagon detector 1 is laid on overpass main line, vehicle is examined here
It surveys device 1 and at least detects the parameters such as vehicle section flow, density, speed；Vehicle route is analyzed to realize and is prolonged in main line driving
It analyzes by mistake, lays tollgate devices 6 respectively at the entry and exit of overpass main line both ends, tollgate devices 6 grab vehicular traffic
It claps, and recognition result uploading system is analyzed；Bridge ramp exit and cloth at 20 meters of main line intersection upstream under overpass
If electronic shooting equipment 4, electronic shooting equipment 4 is recorded and uploaded to common car data excessively here, and system is to information of vehicles
Carry out vehicle routing choice analysis.Central server is laid in center monitoring computer room, central server carries out each facility information
Collection analysis.
The traffic information analysis includes traffic model analysis, the analysis of section traffic flow analysis, Path selection, section congestion
Condition adjudgement, wherein：
Traffic model is analyzed：According to the data that wagon detector 1 collects, traffic flow three is carried out to each section of city expressway and is joined
The analysis of number relational model, includes speed flow models, speed-density model and flow-density model.Pass through each model point
Analysis carries out precise knowledge, for traffic certainly to each section maximum stream flow, critical speed, optimum density, the link characteristics of jam density
Dynamic control strategy provides favourable foundation；
Section traffic flow analysis：According to the data that wagon detector 1 collects, to three parameter of each road traffic delay of city expressway
The situation of changing over time is analyzed, and according to through street main line traffic flow different time sections situation of change, is counted each section and is handed over
Logical changing rule is simultaneously preserved, and carrying out short-time traffic flow forecast for system provides model foundation；
Path selection is analyzed：The vehicle information excessively collected according to tollgate devices 6 and electronic shooting equipment 4, it is overhead to vehicle to run
Path is analyzed, and is analyzed so as to analyze each section vehicle composition source, current limliting strategy is formulated when being section congestion and is carried
For foundation, blindness current limliting is avoided；
Road congestion state judges：The real-time traffic collected according to wagon detector 1, tollgate devices 6 and electronic shooting equipment 4
Information judges road congestion state basis for estimation mainly includes：1st, whether section occupation rate in section downstream is more than default
Threshold values；2nd, judge whether the section is hoarding the volume of traffic by upstream and downstream difference in flow, i.e., total input flow rate is more than total output and flows
Amount；3rd, the delay time that vehicle passes through specific road section.
The induction and signal control strategy are automatically generated and performed comprising three levels, be respectively traffic behavior estimate/
Prediction interval, ramp metering rate rate optimization layer and ring road direct control layer, wherein：
Traffic behavior estimation/prediction interval：According to actual measurement traffic behavior and historical traffic status data, mould is emulated using road grid traffic
Type realizes Viaduct Network traffic flow modes short-term prediction；
Ramp metering rate rate and induction scheme optimization layer：It is up to target with Viaduct Network traffic traffic efficiency, according to prediction traffic
State is solved whole ring road optimistic coordinated control regulation rates, sets clearly system optimization object function, handed over Viaduct Network
Line efficiency is up to optimization objective function all, according to it is real-time detect, the status information of prediction and section traffic, simultaneously
Consider a series of constraints, solve each ring road optimistic coordinated control regulation rate.The constraints of consideration is mainly comprising as follows：
The traffic capacity of main line bottleneck enters out ramp capacity, vehicle routing choice rule etc.；
Ring road direct control layer：Local ring road feedback control regulation rate is calculated, local ring road feedback control regulation rate is ring road tune
Sensing control in real time, is the ramp metering rate strategy based on closed loop feedback control, by the way that main line downstream is maintained to occupy in section control
Rate realizes that main line is maximum by the volume of traffic near a desired value, and local ring road feedback control regulation rate, which calculates, to be chosen
ALINEA ramp metering rate algorithms, ALINEA ramp metering rates algorithm are existing algorithm, this are repeated no more here, then according to prediction
Traffic behavior and the deviation for surveying traffic behavior, choose the regulation rate of ring road；If predicting that traffic behavior deviation is little,
Using optimistic coordinated control regulation rate, otherwise using local ring road feedback control regulation rate；By the regulation rate of each ring road with setting
Fixed threshold values is compared, when the regulation rate of ring road is more than setting threshold values, by automatically controlling ring road entrance lane indicator
2, shutoff operation is carried out to ring road track, without periodical clearance, the induced screen of variable information board 3 shows main line congestion feelings
Condition, prompting of detouring, in addition that no parking etc. is to be reminded for issue, and vehicle is avoided to generate shadow in the parking waiting road pavement traffic of ring road mouth
It rings；When ring road regulation rate be less than setting threshold values when, by automatically controlling ring road entrance lane indicator 2, to ring road track into
Row opening operation, the induced screen of variable information board 3 show main line jam situation.
The control method of above-mentioned overhead expressway Coordinated Ramp Control System, including following operation：
（1）Field research is carried out to road essential information and is arranged：The basic information of road is investigated, includes through street net
Length, main line number of track-lines, lane width, Entrance ramp, exit ramp, interchange position, ring road number of track-lines and ring road it is wide
The basic informations such as degree, and form Viaduct Network information schematic diagram；The Viaduct Network magnitude of traffic flow and traffic bottlenecks point are observed, are
The laying of each equipment provides data and supports；
（2）Determine that the cloth of equipment sets up an office：Determine that wagon detector 1, electronic shooting equipment 4, track refer to according to situation is investigated early period
Show the laying place of the equipment such as device 2, variable information board 3, gantry type advices plate 5, tollgate devices 6, and carry out installation and debugging, and will
Various kinds of equipment carries out unicom by network and monitoring central server；
（3）Information gathering, analysis and the generation of dynamic aspect in real time are with issuing control：
A, to wagon detector 1, electronic shooting equipment 4, track indicator 2, variable information board 3, gantry type advices plate 5, bayonet
6 grade facility informations of equipment are acquired, and according to the real time information that wagon detector 1 detects, are judged whether each section becomes and are gathered around
Stifled point, there are three the foundations of judgement, and first, whether section downstream section occupation rate is more than pre-set threshold value；Second, pass through upstream and downstream
Difference in flow judges whether the section is hoarding the volume of traffic, i.e., total input flow rate is more than total output flow；3rd, vehicle passes through spy
Determine the delay time in section；
B, for each congested link, according to the always input of main line link flow and the principle of total output balance, by road where it
The difference of total input with the total output of section respectively associates the reduction total amount of Entrance ramp inflow traffic as its upstream, then according to setting
Weighing factor coefficient table, calculate it is each association Entrance ramp distribution flow-reduction value, flow-reduction value be each crowded section of highway
Distribute the sum of flow-reduction value；
Above-mentioned to consider road network connection relation, the analysis of Entrance ramp vehicle route, setting Entrance ramp influences each section
Weight coefficient table.Weight coefficient table determines that there are two principles：First, distance divides the nearer ring road in section, and it influences coefficient more
Greatly；Second, contribute the section magnitude of traffic flow its influence coefficient of more ring roads bigger.For example, Entrance ramp is to each road
Section weighing factor coefficient table is as shown in table 1 below：
Table 1
C, the regulation rate of ring road is calculated, the regulation rate of ring road includes optimistic coordinated control regulation rate and local ring road feedback control tune
Section rate；Each ring road optimistic coordinated control regulation rate calculates：Clearly system optimization object function is set, with Viaduct Network traffic
Traffic efficiency is up to optimization objective function, according to the real-time status information for detecting, predicting and section traffic, is examined simultaneously
Consider a series of constraints, solve each ring road optimistic coordinated control regulation rate.The constraints of consideration is mainly comprising as follows：It is main
The traffic capacity of line bottleneck enters out ramp capacity, vehicle routing choice rule etc.；Calculate local ring road feedback control tune
Section rate calculates：ALINEA ramp metering rate algorithms are chosen to be calculated.Then according to prediction traffic behavior with surveying traffic behavior
Deviation chooses the regulation rate of ring road, if prediction traffic behavior deviation is little, using optimistic coordinated control regulation rate,
Otherwise using local ring road feedback control regulation rate；When the regulation rate of the ring road of selection is more than setting threshold values, ring road is carried out
Self-closed controls, and closing and prompting of detouring are provided on the induced screen of variable information board 3；
D, Xun Huan performs above step, realizes the real-time dynamic control to Expressway Traffic.
The purpose of technical solution of the present invention is that design realizes that the Ramp for being suitble to Overhead coordinates control and induction
By laying wagon detector 1, tollgate devices 6 in overhead main line, wagon detector 1 and electronic shooting are laid in ring road for system
Equipment 4 gathers real-time traffic flow information.Track indicator 2, variable information board 3 are laid in ring road entrance, on main line ramp exit
Gantry type advices plate 5 is nearby laid in trip, and is uploaded monitoring central server in real time and stored, using big data analysis technology into
Row analysis in real time automatically generates Ramp according to analysis result system and coordinates to control with induction scheme and control equipment in real time
System, the situation for avoiding overhead main line long-time congestion and traffic efficiency being caused to reduce.
The technical program is adapts to the regulation and control of overhead expressway, and revocation ring road sets with main line intersection and hands over communication light, no
Vehicle is allowed to be lined up on ring road, bridge ring road entrance starting point sets track indicator 2 and variable information board 3 respectively on overpass.
When main line is unimpeded and during slight congestion, ring road entrance is normally let pass, and the induced screen of variable information board 3 is in the form of word and picture
Carry out real-time road induction explanation；When main line moderate or severe congestion, ring road directly opens red light, and ring road is closed,
It not periodically lets pass, the induced screen of variable information board 3 shows main line jam situation, prompting of detouring, and in addition no parking for issue
It is to be reminded, vehicle is avoided to be had an impact in the parking waiting road pavement traffic of ring road mouth.
The technical program is taken according to the traffic capacity condition of main line dynamic traffic bottleneck and magnitude of traffic flow conservation principle
The local method generation regulation rate with coordinating to combine.Each entrance of balance can be played by the implementation of Ramp Coordinated Control Scheme
Ring road transport need, the effect for reducing main line short distance trip proportion, it is final to realize the effect for increasing through street net traffic efficiency.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Ability
The those of ordinary skill in domain should be understood：It can still modify to the technical solution recorded in above-described embodiment or
Equivalent substitution is carried out to which part technical characteristic；And these modifications or replacement, take off the essence of appropriate technical solution
Spirit and scope from various embodiments of the present invention technical solution.
Claims (6)
1. a kind of overhead expressway Coordinated Ramp Control System, including implantation of device, traffic information analysis, induction and signal control
Strategy processed is automatically generated and performed, it is characterised in that：It is described
Implantation of device is：Bridge ring road entrance lays wagon detector with traffic above-ground intersection on overpass, on overpass
Bridge ring road entrance starting point lays track indicator, and bridge ring road entrance starting point lays variable information board on overpass, in overpass
Electronic shooting equipment is laid in upper bridge ring road entrance traffic light, lays gantry type advices plate, vehicle respectively on overpass main line
Detector lays tollgate devices respectively at the entry and exit of overpass main line both ends, and bridge ramp exit is handed over main line under overpass
Electronic shooting equipment is laid at remittance at 20 meters of upstream, central server is laid in center monitoring computer room；
It is described
Traffic information analysis includes traffic model analysis, section traffic flow analysis, Path selection are analyzed, road congestion state is sentenced
It is disconnected, wherein：
Traffic model is analyzed：The data collected according to wagon detector carry out traffic flow three to each section of city expressway and join
The analysis of number relational model, includes speed flow models, speed-density model and flow-density model；Pass through each model point
Analysis carries out precise knowledge, for traffic certainly to each section maximum stream flow, critical speed, optimum density, the link characteristics of jam density
Dynamic control strategy provides favourable foundation；
Section traffic flow analysis：The data collected according to wagon detector, to three parameter of each road traffic delay of city expressway
The situation of changing over time is analyzed, and according to through street main line traffic flow different time sections situation of change, is counted each section and is handed over
Logical changing rule is simultaneously preserved, and carrying out short-time traffic flow forecast for system provides model foundation；
Path selection is analyzed：Vehicle information is crossed according to what tollgate devices and electronic shooting equipment collected, to vehicle to run viaduct
Footpath is analyzed, and is analyzed so as to analyze each section vehicle composition source, is provided to formulate current limliting strategy during the congestion of section
Foundation avoids blindness current limliting；
Road congestion state judges：The real-time traffic collected according to wagon detector, tollgate devices and electronic shooting equipment is believed
Breath, judges road congestion state, basis for estimation mainly includes：1st, whether section occupation rate in section downstream is more than default valve
Value；2nd, judge whether the section is hoarding the volume of traffic by upstream and downstream difference in flow, i.e., total input flow rate is more than total output flow；
3rd, the delay time that vehicle passes through specific road section；
It is described
Induction and signal control strategy are automatically generated and performed comprising three levels, are traffic behavior estimation/prediction interval, circle respectively
Road control rate optimization layer and ring road direct control layer, wherein：
Traffic behavior estimation/prediction interval：According to actual measurement traffic behavior and historical traffic status data, mould is emulated using road grid traffic
Type realizes Viaduct Network traffic flow modes short-term prediction；
Ramp metering rate rate and induction scheme optimization layer：It is up to target with Viaduct Network traffic traffic efficiency, according to prediction traffic
State solves whole ring road optimistic coordinated control regulation rates；
Ring road direct control layer：Local ring road feedback control regulation rate is calculated, and according to prediction traffic behavior and actual measurement traffic shape
The deviation of state chooses the regulation rate of ring road；If predicting that traffic behavior deviation is little, adjusted using optimistic coordinated control
Rate, otherwise using local ring road feedback control regulation rate；By the regulation rate of each ring road compared with the threshold values set, work as circle
When the regulation rate in road is more than setting threshold values, by automatically controlling ring road entrance lane indicator, closing behaviour is carried out to ring road track
Make, without periodical clearance, the induced screen of variable information board shows main line jam situation, prompting of detouring, and in addition issue is forbidden
Parking waiting is reminded, and vehicle is avoided to be had an impact in the parking waiting road pavement traffic of ring road mouth；It is set when the regulation rate of ring road is less than
When determining threshold values, by automatically controlling ring road entrance lane indicator, opening operation is carried out to ring road track, variable information board lures
It leads screen and shows main line jam situation.
2. the control method of overhead expressway Coordinated Ramp Control System according to claim 1, it is characterised in that：Bag
Include following operation：
（1）Field research is carried out to road essential information and is arranged：The basic information of road is investigated, includes through street net
Length, main line number of track-lines, lane width, Entrance ramp, exit ramp, interchange position, ring road number of track-lines and ring road it is wide
The basic information of degree, and form Viaduct Network information schematic diagram；The Viaduct Network magnitude of traffic flow and traffic bottlenecks point are observed, are
The laying of equipment provides data and supports；
（2）Determine that the cloth of equipment sets up an office：Wagon detector, electronic shooting equipment, track instruction are determined according to situation is investigated early period
Device, variable information board, gantry type advices plate, the laying place of tollgate devices, and installation and debugging are carried out, and above equipment is passed through
Network carries out unicom with monitoring central server；
（3）Information gathering, analysis and the generation of dynamic aspect in real time are with issuing control：
A, to wagon detector, electronic shooting equipment, track indicator, variable information board, gantry type advices plate, tollgate devices etc.
Facility information is acquired, and according to the real time information that wagon detector detects, is judged whether each section becomes congestion points, is judged
Foundation there are three, first, section downstream section occupation rate whether be more than pre-set threshold value；Second, sentenced by upstream and downstream difference in flow
Whether the disconnected section is hoarding the volume of traffic, i.e., total input flow rate is more than total output flow；3rd, vehicle passes through specific road section
Delay time；
B, for each congested link, according to the always input of main line link flow and the principle of total output balance, by road where it
The difference of total input with the total output of section respectively associates the reduction total amount of Entrance ramp inflow traffic as its upstream, then according to setting
Weighing factor coefficient table, calculate it is each association Entrance ramp distribution flow-reduction value, flow-reduction value be each crowded section of highway
Distribute the sum of flow-reduction value；
C, optimistic coordinated control regulation rate and local ring road feedback control regulation rate are calculated；Then according to prediction traffic behavior and reality
The deviation of traffic behavior is surveyed, the regulation rate of ring road is chosen, if prediction traffic behavior deviation is little, using optimal coordination
Control and regulation rate, otherwise using local ring road feedback control regulation rate；When the regulation rate of the ring road of selection is more than setting threshold values,
Self-closed control is carried out to ring road, and closing and prompting of detouring are provided on the induced screen of variable information board；
D, Xun Huan performs above step, realizes the real-time dynamic control to Expressway Traffic.
3. overhead expressway Coordinated Ramp Control System according to claim 1, it is characterised in that：On the overpass
Bridge ring road entrance is earth magnetism wagon detector with the wagon detector that traffic above-ground intersection lays.
4. overhead expressway Coordinated Ramp Control System according to claim 1, it is characterised in that：The part ring road
Feedback control regulation rate, which calculates, chooses ALINEA ramp metering rate algorithms.
5. overhead expressway Coordinated Ramp Control System according to claim 1, it is characterised in that：The optimal coordination
The calculating of control and regulation rate is up to optimization objective function with Viaduct Network traffic traffic efficiency, according to real-time detection, prediction
Status information and section traffic, while consider the traffic capacity of main line bottleneck, enter out ramp capacity, vehicle road
A series of selective rules constraintss in footpath solve each ring road optimistic coordinated control regulation rate.
6. the control method of overhead expressway Coordinated Ramp Control System according to claim 2, it is characterised in that：Institute
The definite principle for stating weight coefficient table is：First, its influence coefficient of the nearer ring road in distance division section is bigger；Second, it satisfies the need
The section magnitude of traffic flow contributes its influence coefficient of more ring roads bigger.
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