CN102881173A - Traffic demand control method and system - Google Patents
Traffic demand control method and system Download PDFInfo
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- CN102881173A CN102881173A CN2012103581977A CN201210358197A CN102881173A CN 102881173 A CN102881173 A CN 102881173A CN 2012103581977 A CN2012103581977 A CN 2012103581977A CN 201210358197 A CN201210358197 A CN 201210358197A CN 102881173 A CN102881173 A CN 102881173A
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Abstract
The invention discloses a traffic demand control method and a traffic demand control system. According to the invention, each crossing which is predetermined in a preset area is provided with a demand control signal machine and a front end detector; each front end detector acquires traffic flow data of each crossing in real time and the traffic flow data are stored in the demand control signal machine connected with the front end detector, and a control center reads traffic flow data, which are stored in each demand control signal machine, of the current acquisition period, every acquisition period; the control center acquires the current area traffic congestion state according to the read traffic flow data; when the current area traffic congestion state meets a preset demand control trigger condition, the control center makes an area traffic demand control strategy and sends the area traffic demand control strategy to the specified demand control signal machine; and the specified demand control signal machine executes the received area traffic demand control strategy. By the traffic demand control method and the traffic demand control system, regional traffic congestion can be effectively relieved.
Description
Technical field
The present invention relates to the traffic control technology, particularly a kind of transport need control method and system.
Background technology
Along with the fast development of urban economy, the quantity of the various vehicles in the city also sharply increases thereupon, and therefore, the generation of large-area regional traffic congestion event is also more and more frequent.Especially in the zones such as economy and finance center, administrative center and commercial center in city, scope, the duration of traffic congestion and the degree of blocking up that traffic congestion occurs are more serious.At this moment, if only the fundamentally transport solution problem of blocking up of traffic control is carried out in certain crossing of part or certain bar highway section, and need to treat and alleviate traffic jam issue from the angle in zone, namely control to alleviate traffic jam issue by zonal transport need.
Because the transport need that has its source in that traffic jam issue occurs surpasses traffic and supplies with, therefore zonal transport need control is exactly the traffic behavior of controlling each crossing in certain zone by traffic signals, the relative changes transport need, and then reach the purpose of alleviating traffic congestion.
For above-mentioned Urban Traffic Jam Based, various solutions of the prior art generally all only rest on the aspect that traffic jam judging and traffic congestion are estimated, and lack the deeper signal control method of dredging towards traffic congestion.And traditional traffic signal control method, the traffic congestion that generally also only possesses local crossing or highway section is dredged ability, but then helpless for zonal traffic congestion.
As from the foregoing, also there are some above-mentioned problems in transport need control method of the prior art, therefore, is necessary to provide a kind of transport need control method of traffic congestion of Based on Regional, thereby alleviates zonal traffic congestion.
Summary of the invention
According to the present invention, a kind of transport need control method and system are provided, thereby can have effectively alleviated zonal traffic congestion.
According to an aspect of the present invention, provide a kind of transport need control method, it comprises:
A, at each predetermined crossing of presumptive area demand control signal machine and front-end detector are set;
The traffic flow data at B, each each crossing of front-end detector Real-time Collection also deposits in the demand control signal machine that connects separately, and control center reads the traffic flow data of the current collection period of storing in each demand control signal machine every a collection period;
C, control center obtain current area traffic jamming state according to the traffic flow data that reads;
D, when current area traffic jamming state satisfies default demand control trigger condition, control center formulates regional traffic demand control strategy, and described regional traffic demand control strategy is sent to the demand control signal machine of appointment;
The demand control signal machine of E, described appointment is carried out received regional traffic demand control strategy.
Wherein, described demand control signal machine comprises: one-level demand control signal machine, secondary demand control signal machine and three grades of demand control signal machines;
Described front-end detector comprises: one-level front-end detector, secondary front-end detector and secondary front-end detector.
Wherein, described steps A comprises:
Each peripheral crossing in presumptive area arranges one-level demand control signal machine and one-level front-end detector;
Each main crossroads in presumptive area arrange secondary demand control signal machine and secondary front-end detector;
At each less important crossing of presumptive area three grades of demand control signal machines and three grades of front-end detector are set.
Wherein, described collection period was more than or equal to 3 minutes.
Wherein, described step C comprises:
In described presumptive area, specify in advance at least one phase place at least one crossing;
Calculate the traffic intensity of each designated phase according to the traffic flow data that reads;
Traffic intensity zoning traffic intensity mean value according to each designated phase;
With described regional traffic average strength as current area traffic jamming state.
Wherein, the formula of the traffic intensity mean value of described each designated phase of calculating is:
Wherein, described I
IjTraffic intensity for j the phase place at i crossing of appointment in the described presumptive area; Described α and β are the traffic intensity correction factor, and span is [0,1]; Described q
IjThe arrival rate that detects for the front-end detector in j the phase place at described i crossing; Described S
IjSaturation volume rate for j the phase place at described i crossing; Described O
IjTime occupancy for j the phase place at described i crossing; Described O
SijThe corresponding time occupancy of saturation volume rate for j the phase place at described i crossing.
Wherein, the formula that calculates described regional traffic average strength is:
Wherein, described
Regional traffic average strength for described presumptive area C; Described I
CijTraffic intensity for j the phase place at i crossing of appointment among the described presumptive area C; Described m is the sum of all designated phase.
Wherein, before described step C, the method also further comprises:
Control center carries out misdata Screening Treatment, smoothing processing and prediction processing to the traffic flow data that reads.
Wherein, described step D comprises:
D1, judge that whether current area traffic jamming state satisfies default one-level transport need control trigger condition, if, execution in step D2 then; Otherwise, execution in step D5;
D2, control center formulate level-1 area transport need control strategy, and described level-1 area transport need control strategy is sent to one-level demand control signal machine;
D3, judge that whether current area traffic jamming state satisfies default secondary transport need control trigger condition, if, execution in step D4 then; Otherwise, execution in step D5;
D4, control center formulate level-2 area transport need control strategy, and described level-2 area transport need control strategy is sent to secondary demand control signal machine;
D5, judge whether current area traffic jamming state satisfies transport need control termination condition, if, execution in step D6 then; Otherwise, postpone a delay period after, return execution in step D1;
D6, control center send the recovery instruction to one-level demand control signal machine and secondary demand control signal machine, so that described one-level demand control signal machine and secondary demand control signal machine recover to carry out initial traffic control scheme according to described recovery instruction.
Wherein, described one-level transport need control trigger condition is:
In a N continuous collection period, current regional traffic average strength
All greater than the first default traffic intensity threshold value
And the actual traffic influx Q that detects all starts influx Q greater than default one-level demand control
MlWherein, described N is natural number.
Wherein, described formulation level-1 area transport need control strategy comprises:
According to the traffic intensity at each crossing at one-level demand control signal machine place, determine the signal period at described each crossing;
The traffic flow data at each crossing that gathers according to each one-level front-end detector is determined the permission rate of inflow at each crossing at one-level demand control signal machine place;
According to determined signal period and permission rate of inflow, each phase place split at each crossing at first order calculation demand control signal machine place.
Wherein, described secondary transport need control trigger condition is:
In a N continuous collection period, current regional traffic average strength
All greater than the second default traffic intensity threshold value
Wherein, described formulation level-2 area transport need control strategy comprises:
According to the traffic intensity at each crossing at secondary demand control signal machine place, determine the signal period at described each crossing;
The traffic flow data at each crossing that gathers according to each secondary front-end detector is determined the permission rate of inflow at each crossing at secondary demand control signal machine place;
According to determined signal period and permission rate of inflow, calculate each phase place split at each crossing at secondary demand control signal machine place.
Wherein, described delay period is N collection period; Wherein, N is natural number.
Wherein, described transport need control termination condition is:
In a N continuous collection period, current regional traffic average strength
All less than the 3rd default traffic intensity threshold value
And the actual traffic influx Q that detects all finishes influx Q less than default one-level demand control
M2Wherein, described N is natural number.
Wherein, the demand control signal machine of described appointment is: one-level demand control signal machine and/or secondary demand control signal machine.
Wherein, described three grades of demand control signal machines are carried out the bottleneck control strategy.
Wherein, described bottleneck control strategy is:
Exit ramp at each crossing arranges the queuing detecting device in advance;
When described queuing detecting device has detected stoppage of vehicle near described queuing detecting device the time, reduce the entrance phase green time that this exports to according to default time step.
According to another aspect of the present invention, also provide a kind of transport need control system, this system comprises: control center, be arranged on a plurality of demand control signal machines and a plurality of front-end detector at each predetermined crossing of presumptive area; Wherein,
Described front-end detector is used for the traffic flow data at each crossing of Real-time Collection, and the traffic flow data that gathers is deposited in the connected demand control signal machine;
Described control center is used for reading every a collection period traffic flow data of the current collection period that each demand control signal machine stores, and obtains current area traffic jamming state according to the traffic flow data that reads; Also be used for when current area traffic jamming state satisfies default demand control trigger condition, formulating regional traffic demand control strategy, and described regional traffic demand control strategy being sent to the demand control signal machine of appointment;
Described demand control signal machine for the traffic flow data at each crossing of storing connected front-end detector Real-time Collection, also is used for carrying out received regional traffic demand control strategy.
Wherein, described demand control signal machine comprises: one-level demand control signal machine, secondary demand control signal machine and three grades of demand control signal machines.
Described front-end detector comprises: one-level front-end detector, secondary front-end detector and secondary front-end detector.
Wherein, described one-level demand control signal machine and one-level front-end detector are arranged at each peripheral crossing of described presumptive area;
Described secondary demand control signal machine and secondary front-end detector are arranged at each main crossroads of described presumptive area;
Described three grades of demand control signal machines and three grades of front-end detector are arranged at each less important crossing of described presumptive area.
Wherein, the demand control signal machine of described appointment is: one-level demand control signal machine and/or secondary demand control signal machine.
Wherein, described control center is also at least one phase place of specifying in advance at least one crossing in described presumptive area; Calculate the traffic intensity of each designated phase according to the traffic flow data that reads; Traffic intensity zoning traffic intensity mean value according to each designated phase; With described regional traffic average strength as current area traffic jamming state.
Wherein, described control center also is used for the traffic flow data that reads is carried out misdata Screening Treatment, smoothing processing and prediction processing.
Wherein, described control center, also be used for when whether current area traffic jamming state satisfies default one-level transport need control trigger condition, formulating level-1 area transport need control strategy, and described level-1 area transport need control strategy being sent to one-level demand control signal machine; When whether current area traffic jamming state satisfies default secondary transport need control trigger condition, formulate level-2 area transport need control strategy, and described level-2 area transport need control strategy is sent to secondary demand control signal machine; When whether current area traffic jamming state satisfies transport need control termination condition, send the recovery instruction to one-level demand control signal machine and secondary demand control signal machine, so that described one-level demand control signal machine and secondary demand control signal machine recover to carry out initial traffic control scheme according to described recovery instruction.
Wherein, described three grades of demand control signal machines also are used for carrying out the bottleneck control strategy.
As seen from the above technical solution, in the transport need control method in the present invention, owing to being provided with demand control signal machine and front-end detector at each predetermined crossing; But the traffic flow data at each each crossing of front-end detector Real-time Collection also deposits in the demand control signal machine that connects separately, control center then can read every a collection period traffic flow data of the current collection period of storing in each demand control signal machine, so control center can obtain current area traffic jamming state according to the traffic flow data that reads.When current area traffic jamming state satisfies default demand control trigger condition, control center can send to the regional traffic demand control strategy of formulating the demand control signal machine of appointment, and the demand control signal machine of described appointment can be carried out received regional traffic demand control strategy, thereby whether can judge in the presumptive area traffic congestion of region, and when the traffic congestion of region, automatically control adjustment enters the volume of traffic of presumptive area and main crossroads, so that zonal traffic congestion can be alleviated effectively.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art.Apparently, the accompanying drawing in below describing only is some embodiments of the present invention, for those of ordinary skills, can also obtain according to these accompanying drawing illustrated embodiments other embodiment and accompanying drawing thereof.
Fig. 1 is the schematic flow sheet of the transport need control method in the embodiment of the invention;
Fig. 2 is the schematic diagram of a kind of concrete methods of realizing of step 103 in the embodiment of the invention;
Fig. 3 is the schematic diagram of a kind of concrete methods of realizing of step 104 in the embodiment of the invention;
Fig. 4 is a kind of schematic diagram of formulating the method for level-1 area transport need control strategy in the embodiment of the invention.
Fig. 5 is a kind of schematic diagram of formulating the method for level-2 area transport need control strategy in the embodiment of the invention.
Fig. 6 is the structural representation of the transport need control system in the embodiment of the invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
Fig. 1 is the schematic flow sheet of the transport need control method in the embodiment of the invention.As shown in Figure 1, the transport need control method in the embodiment of the invention comprises step as described below:
Step 101 arranges demand control signal machine and front-end detector at each predetermined crossing of presumptive area.
In this step, can pre-determine a presumptive area, then at each predetermined crossing of this predetermined presumptive area demand control signal machine and front-end detector are set, be used for gathering the traffic flow data at each crossing.
Better, in specific embodiments of the invention, described demand control signal machine comprises:
One-level demand control signal machine, secondary demand control signal machine and three grades of demand control signal machines.
Described front-end detector comprises:
One-level front-end detector, secondary front-end detector and secondary front-end detector.
Therefore, better, in specific embodiments of the invention, demand control signal machine is set at described each predetermined crossing in presumptive area and front-end detector can comprise:
Each peripheral crossing in presumptive area arranges one-level demand control signal machine and one-level front-end detector; Each main crossroads in presumptive area arrange secondary demand control signal machine and secondary front-end detector; At each less important crossing of presumptive area three grades of demand control signal machines and three grades of front-end detector are set.
Wherein, in preferred embodiment of the present invention, described presumptive area pre-determines according to the needs of actual application environment; Each crossing that the peripheral crossing of each of described presumptive area refers to is that described presumptive area is in communication with the outside, be positioned at described presumptive area periphery, vehicle can pass in and out described presumptive area by described each peripheral crossing; Each main crossroads of described presumptive area refer to each crossing on each bar main road of described presumptive area inside; The less important crossing of each of described presumptive area refers to each crossing on each bar secondary distributor road of described presumptive area inside.
In specific embodiments of the invention, can set in advance a collection period, the traffic flow data at each each crossing of front-end detector Real-time Collection at each crossing, and then the traffic flow data that gathers deposited in the demand control signal machine that is connected respectively with each front-end detector; Control center then can read the traffic flow data of the current collection period of storing in each demand control signal machine every a collection period, and deposits in the central database.
Better, in specific embodiments of the invention, described collection period was more than or equal to 3 minutes.For example, described collection period can be 3 minutes, 4 minutes, 5 minutes or 10 minutes etc.
In this step, after the traffic flow data that control center stores, can obtain according to the traffic flow data that reads the current area traffic jamming state of whole presumptive area in reading each demand control signal machine.
In technical scheme of the present invention, can realize above-mentioned step 103 with several different methods.Below will take wherein a kind of embodiment as example, technical scheme of the present invention be described in detail.
For example, Fig. 2 is the schematic diagram of a kind of concrete methods of realizing of step 103 in the embodiment of the invention.As shown in Figure 2, in preferred embodiment of the present invention, described step 103 can realize by step as described below:
In order to reflect comparatively accurately the traffic congestion situation in whole zone, control center needs to specify in advance in this step a plurality of main crossroads from presumptive area, and specifies at least one phase place in each main crossroads.
For example, if in presumptive area, the crossing that the most easily gets congestion is crossing A, and the some or a plurality of phase places among the A of this crossing easily get congestion, and the one or more phase places in then can crossing A are set to designated phase.The rest may be inferred, can specify in advance a plurality of phase places at a plurality of crossings in described presumptive area.
Because in step 102, each front-end detector is the traffic flow data at each crossing of Real-time Collection and is stored in the demand control signal machine that is connected with front-end detector, control center then can just read every a collection period traffic flow data of its current collection period of storing from each demand control signal machine, therefore, the traffic intensity of each designated phase can calculate according to the traffic flow data that reads in control center.
Better, in specific embodiments of the invention, can calculate according to formula as described below the traffic intensity mean value of each designated phase:
Wherein, described I
IjTraffic intensity for j the phase place at i crossing of appointment in the described presumptive area (can referred to as phase place ij, lower with); Described α and β are the traffic intensity correction factor, and span is [0,1]; Described q
IjThe arrival rate that detects for the front-end detector among the phase place ij; Described S
IjSaturation volume rate for phase place ij; Described O
IjTime occupancy for phase place ij; Described O
SijBe the corresponding time occupancy of the saturation volume rate of phase place ij.
Owing to can calculate the traffic intensity of each designated phase in step 202, therefore in this step, control center can be according to the traffic intensity zoning traffic intensity mean value of each designated phase.
Better, in specific embodiments of the invention, can come according to formula as described below zoning traffic intensity mean value:
Wherein, described
Regional traffic average strength for described presumptive area C; Described I
CijTraffic intensity for j the phase place at i crossing of appointment among the described presumptive area C; Described m is the sum of all designated phase.
By above-mentioned step 201～204, can obtain current area traffic jamming state according to the traffic flow data that reads.
In addition, in preferred embodiment of the present invention, before control center determines current area traffic jamming state according to the traffic flow data that reads, also can further comprise:
Control center carries out misdata Screening Treatment, smoothing processing and prediction processing to the traffic flow data that reads, thereby eliminates the misdata that may exist in the traffic flow data that is read, and is convenient to carry out follow-up calculating.
In specific embodiments of the invention, described demand control trigger condition can preset according to practical situations.
In technical scheme of the present invention, can realize above-mentioned step 104 with several different methods.Below will take wherein a kind of specific implementation as example, technical scheme of the present invention be described in detail.
For example, Fig. 3 is the schematic diagram of a kind of concrete methods of realizing of step 104 in the embodiment of the invention.As shown in Figure 3, in preferred embodiment of the present invention, described step 104 can realize by step as described below:
Step 301 judges whether current area traffic jamming state satisfies default one-level transport need control trigger condition, if then execution in step 302; Otherwise, execution in step 305.
In this step, will judge first whether current area traffic jamming state satisfies default one-level transport need control trigger condition.If satisfy one-level transport need control trigger condition, then execution in step 302; Otherwise, execution in step 305.
In addition, in specific embodiments of the invention, described one-level transport need control trigger condition can preset according to practical situations.
For example, in preferred embodiment of the present invention, described one-level transport need control trigger condition can be:
In a N continuous collection period, current regional traffic average strength
All greater than the first default traffic intensity threshold value
And the actual traffic influx Q that detects all starts influx Q greater than default one-level demand control
M1
Wherein, described N is natural number, described N,
And Q
M1Value can pre-determine according to the needs of actual application environment.
Step 302, control center formulates level-1 area transport need control strategy, and described level-1 area transport need control strategy is sent to one-level demand control signal machine.
At this moment, because current area traffic jamming state has satisfied default one-level transport need control trigger condition, that is to say, the transport need that current peripheral crossing by described presumptive area enters described presumptive area is larger, thereby the regional traffic congestion phenomenon of certain degree occured, so in this step, control center is with the traffic flow data of elder generation according to each crossing of each one-level front-end detector collection, formulate level-1 area transport need control strategy, and then described level-1 area transport need control strategy sent to one-level demand control signal machine, to carry out the control of one-level demand, thereby effectively reduce the transport need that enters described presumptive area from the peripheral crossing of described presumptive area, to alleviate zonal traffic congestion.
Be to control the external world of presumptive area to the traffic influx of presumptive area inside owing to alleviating the key of above-mentioned traffic congestion, therefore the core of described level-1 area transport need control strategy just is how to set signal period and each phase place split (especially flowing into the phase place of presumptive area inside) at each the peripheral crossing in the presumptive area.
Therefore, in technical scheme of the present invention, can formulate level-1 area transport need control strategy with several different methods.Below will take wherein a kind of embodiment as example, technical scheme of the present invention be described in detail.
For example, Fig. 4 is a kind of schematic diagram of formulating the method for level-1 area transport need control strategy in the embodiment of the invention.As shown in Figure 4, in preferred embodiment of the present invention, described formulation level-1 area transport need control strategy can comprise step as described below:
Step 401 according to the traffic intensity at each crossing at one-level demand control signal machine place, is determined the signal period at described each crossing.
Wherein, the described signal period refers to the rotational cycle of the various traffic signals at described crossing.
In this step, can determine that according to traffic intensity the method for signal period determines the signal period at each crossing at one-level demand control signal machine place according to commonly used.Concrete definite method does not repeat them here.
In addition, in specific embodiments of the invention, the signal period at each crossing at described one-level demand control signal machine place can be identical, also can be not identical.
Step 402, the traffic flow data at each crossing that gathers according to each one-level front-end detector is determined the permission rate of inflow at each crossing at one-level demand control signal machine place.
Wherein, described permission rate of inflow is: per hour or each data acquisition interval allow the traffic influx that enters.
In this step, can determine according to the method according to the definite permission of traffic flow data rate of inflow commonly used the permission rate of inflow at each crossing at one-level demand control signal machine place.Concrete definite method does not repeat them here.
Step 403 is according to determined signal period and permission rate of inflow, each phase place split at each crossing at first order calculation demand control signal machine place.
By above-mentioned step 401～403, can determine signal period and each phase place split at each crossing at one-level demand control signal machine place, thereby can finish the formulation of level-1 area transport need control strategy.
Step 303 judges whether current area traffic jamming state satisfies default secondary transport need control trigger condition, if then execution in step 304; Otherwise, execution in step 305.
In this step, will judge whether current area traffic jamming state satisfies default secondary transport need control trigger condition.If meeting tier 2 transport need control trigger condition, then execution in step 304; Otherwise, execution in step 305.
In addition, in specific embodiments of the invention, described secondary transport need control trigger condition can preset according to practical situations.
For example, in preferred embodiment of the present invention, described secondary transport need control trigger condition can be:
In a N continuous collection period, current regional traffic average strength
All greater than the second default traffic intensity threshold value
Step 304, control center formulates level-2 area transport need control strategy, and described level-2 area transport need control strategy is sent to secondary demand control signal machine.
At this moment, because current area traffic jamming state has satisfied default secondary transport need control trigger condition, that is to say, the transport need of current each main crossroads by described presumptive area is also larger, so in this step, control center is with the traffic flow data of elder generation according to each crossing of each secondary front-end detector collection, formulate level-2 area transport need control strategy, and then described level-2 area transport need control strategy sent to secondary demand control signal machine, to carry out the control of secondary demand, thereby effectively reduce the transport need of each main crossroads of described presumptive area, to alleviate zonal traffic congestion.
Because alleviate the traffic influx that the key of above-mentioned traffic congestion is to control each main crossroads of presumptive area, therefore the core of described level-2 area transport need control strategy just is how to set signal period and each phase place split of each main crossroads in the presumptive area.
Therefore, in technical scheme of the present invention, can formulate level-2 area transport need control strategy with several different methods.Below will take wherein a kind of embodiment as example, technical scheme of the present invention be described in detail.
For example, Fig. 5 is a kind of schematic diagram of formulating the method for level-2 area transport need control strategy in the embodiment of the invention.As shown in Figure 5, in preferred embodiment of the present invention, described formulation level-2 area transport need control strategy can comprise step as described below:
Step 501 according to the traffic intensity at each crossing at secondary demand control signal machine place, is determined the signal period at described each crossing.
In this step, can determine that according to traffic intensity the method for signal period determines the signal period at each crossing at secondary demand control signal machine place according to commonly used.Concrete definite method does not repeat them here.
In addition, in specific embodiments of the invention, the signal period at each crossing at described secondary demand control signal machine place can be identical, also can be not identical.
In this step, can determine according to the method according to the definite permission of traffic flow data rate of inflow commonly used the permission rate of inflow at each crossing at secondary demand control signal machine place.Concrete definite method does not repeat them here.
Step 503 according to determined signal period and permission rate of inflow, is calculated each phase place split at each crossing at secondary demand control signal machine place.
By above-mentioned step 501～503, can determine signal period and each phase place split at each crossing at secondary demand control signal machine place, thereby can finish the formulation of level-2 area transport need control strategy.
Step 305 judges whether current area traffic jamming state satisfies transport need control termination condition, if then execution in step 306; Otherwise, postpone a delay period after, return execution in step 301.
In this step, will judge whether current area traffic jamming state satisfies transport need control termination condition.If transport need control termination condition is met, then with execution in step 306; Otherwise, then will after postponing a delay period, return again execution in step 301.
Better, in specific embodiments of the invention, described delay period can be N collection period (wherein, N is natural number), also can be other predefined time interval.
Better, in specific embodiments of the invention, described transport need control termination condition can preset according to practical situations.
For example, in preferred embodiment of the present invention, described transport need control termination condition can be:
In a N continuous collection period, current regional traffic average strength
All less than the 3rd default traffic intensity threshold value
And the actual traffic influx Q that detects all finishes influx Q less than default one-level demand control
M2
Wherein, described N is natural number.Described N,
And Q
M2Value all can pre-determine according to the needs of actual application environment.
Step 306, control center sends the recovery instruction to one-level demand control signal machine and secondary demand control signal machine, so that described one-level demand control signal machine and secondary demand control signal machine recover to carry out initial traffic control scheme according to recovering instruction.
Wherein, described initial traffic control scheme refers to: current area traffic jamming state satisfies before the default demand control trigger condition, original traffic control scheme that described one-level demand control signal machine and secondary demand control signal machine are being carried out respectively.
For example, if before current area traffic jamming state satisfies default demand control trigger condition, what described one-level demand control signal machine was performed is multi-period fixed cycle control program (being that described initial traffic control scheme is multi-period fixed cycle control program), then after described one-level demand control signal machine receives the recovery instruction, described one-level demand control signal machine will recover to carry out described multi-period fixed cycle control program.
Again for example, if before current area traffic jamming state satisfies default demand control trigger condition, what described secondary demand control signal machine was performed is Coordinated Control Scheme (being that described initial traffic control scheme is Coordinated Control Scheme), then after described secondary demand control signal machine receives the recovery instruction, described secondary demand control signal machine will recover to carry out described Coordinated Control Scheme.
Better, in specific embodiments of the invention, described initial traffic control scheme can be: pre-stored traffic control scheme in described one-level demand control signal machine and secondary demand control signal machine before step 104.
Because the judgement according to step 305, current area traffic jamming state has satisfied transport need control termination condition, it is the domain of the existence problem of blocking up not in the presumptive area, also just there is no need to carry out again level-1 area transport need control strategy and/or level-2 area transport need control strategy this moment, so, in this step, control center can send to one-level demand control signal machine and secondary demand control signal machine with recovering instruction, thereby so that described one-level demand control signal machine and secondary demand control signal machine recover to carry out initial traffic control scheme.
By above-mentioned step 301～306, can judge whether current area traffic jamming state satisfies default demand control trigger condition, and when current area traffic jamming state satisfies default demand control trigger condition, formulate regional traffic demand control strategy by control center, and described regional traffic demand control strategy is sent to the demand control signal machine of appointment, i.e. one-level demand control signal machine and/or secondary demand control signal machine.
Better, in specific embodiments of the invention, the demand control signal machine of described appointment can be: one-level demand control signal machine and/or secondary demand control signal machine.
Better, in specific embodiments of the invention, because three grades of demand control signal machines are arranged at each less important crossing of described presumptive area, it is each crossing on each bar secondary distributor road of described presumptive area inside, therefore control center is to described three grades of demand control signal machine sending zone transport need control strategies, and described three grades of demand control signal machines will automatically perform the bottleneck control strategy.
Wherein, described bottleneck control strategy is:
Exit ramp at each crossing arranges the queuing detecting device in advance;
When described queuing detecting device has detected stoppage of vehicle near described queuing detecting device the time, represent that then blocking up has appearred in this crossing, at this moment, can reduce the entrance phase green time that this exports to according to default time step.
By carrying out above-mentioned bottleneck control strategy, described three grades of demand control signal machines can be alleviated the traffic jam issue on each less important crossing of described presumptive area automatically.
As from the foregoing, in the transport need control method in the present invention, owing to being provided with demand control signal machine and front-end detector at each predetermined crossing; The traffic flow data at each each crossing of front-end detector Real-time Collection also deposits in the demand control signal machine that connects separately, control center then reads the traffic flow data of the current collection period of storing in each demand control signal machine every a collection period, so control center can obtain current area traffic jamming state according to the traffic flow data that reads.When current area traffic jamming state satisfies default demand control trigger condition, control center can send to the regional traffic demand control strategy of formulating the demand control signal machine of appointment, and the demand control signal machine of described appointment can be carried out received regional traffic demand control strategy, thereby whether can judge in the presumptive area traffic congestion of region, and when the traffic congestion of region, automatically control adjustment enters the volume of traffic of presumptive area and main crossroads, so that zonal traffic congestion can be alleviated effectively.
Further, because in above-mentioned further technical scheme, the control of regional traffic demand is divided for three ranks, and enter the traffic influx of presumptive area by the peripheral crossing that one-level demand control signal machine is controlled presumptive area, control the traffic influx of the main crossroads in the presumptive area by secondary demand control signal machine, also control the traffic influx at the less important crossing in the presumptive area with the bottleneck control strategy by three grades of demand control signal machines, thereby can classification the peripheral crossing of regulation and control presumptive area, therefore the traffic influx at main crossroads and less important crossing can alleviate zonal traffic congestion more effectively.
In addition, in technical scheme of the present invention, a kind of transport need control system has been proposed also.
Fig. 6 is the structural representation of the transport need control system in the embodiment of the invention.As shown in Figure 6, the transport need control system in the embodiment of the invention comprises: control center 61, be arranged on a plurality of demand control signal machines 62 and a plurality of front-end detector 63 at each predetermined crossing of presumptive area.
Wherein, described front-end detector 63 is used for the traffic flow data at each crossing of Real-time Collection, and the traffic flow data that gathers is deposited in the connected demand control signal machine 62;
Described control center 61, the traffic flow data for the current collection period that reads 62 storages of demand control signal machine every a collection period obtains current area traffic jamming state according to the traffic flow data that reads; Also be used for when current area traffic jamming state satisfies default demand control trigger condition, formulating regional traffic demand control strategy, and described regional traffic demand control strategy being sent to the demand control signal machine 62 of appointment;
Described demand control signal machine 62 for the traffic flow data at each crossing of storing connected front-end detector Real-time Collection, also is used for carrying out received regional traffic demand control strategy.
Better, in specific embodiments of the invention, described demand control signal machine 62 comprises: one-level demand control signal machine, secondary demand control signal machine and three grades of demand control signal machines.
Described front-end detector 63 comprises: one-level front-end detector, secondary front-end detector and secondary front-end detector.
Better, in specific embodiments of the invention,
Described one-level demand control signal machine and one-level front-end detector are arranged at each peripheral crossing of described presumptive area;
Described secondary demand control signal machine and secondary front-end detector are arranged at each main crossroads of described presumptive area;
Described three grades of demand control signal machines and three grades of front-end detector are arranged at each less important crossing of described presumptive area.
Better, in specific embodiments of the invention, the demand control signal machine of described appointment is: one-level demand control signal machine and/or secondary demand control signal machine.
Better, in specific embodiments of the invention,
Described control center 61 is also at least one phase place of specifying in advance at least one crossing in described presumptive area; Calculate the traffic intensity of each designated phase according to the traffic flow data that reads; Traffic intensity zoning traffic intensity mean value according to each designated phase; With described regional traffic average strength as current area traffic jamming state.
Better, in specific embodiments of the invention,
Described control center 61 also is used for the traffic flow data that reads is carried out misdata Screening Treatment, smoothing processing and prediction processing.
Better, in specific embodiments of the invention,
Described control center 61, also be used for when whether current area traffic jamming state satisfies default one-level transport need control trigger condition, formulate level-1 area transport need control strategy, and described level-1 area transport need control strategy is sent to one-level demand control signal machine; When whether current area traffic jamming state satisfies default secondary transport need control trigger condition, formulate level-2 area transport need control strategy, and described level-2 area transport need control strategy is sent to secondary demand control signal machine; When whether current area traffic jamming state satisfies transport need control termination condition, send the recovery instruction to one-level demand control signal machine and secondary demand control signal machine, so that described one-level demand control signal machine and secondary demand control signal machine recover to carry out initial traffic control scheme according to described recovery instruction.
Better, in specific embodiments of the invention, described three grades of demand control signal machines also are used for carrying out the bottleneck control strategy.
In summary, in the transport need control method and system that provides in the present invention, owing to being provided with demand control signal machine and front-end detector at each predetermined crossing; But the traffic flow data at each each crossing of front-end detector Real-time Collection also deposits in the demand control signal machine that connects separately, control center then can read every a collection period traffic flow data of the current collection period of storing in each demand control signal machine, so that control center can obtain current area traffic jamming state according to the traffic flow data that reads.When current area traffic jamming state satisfies default demand control trigger condition, control center can send to the regional traffic demand control strategy of formulating the demand control signal machine of appointment, and the demand control signal machine of described appointment can be carried out received regional traffic demand control strategy, thereby whether can judge in the presumptive area traffic congestion of region, and when the traffic congestion of region, automatically control adjustment enters the volume of traffic of presumptive area and main crossroads, so that zonal traffic congestion can be alleviated effectively.
Further, because in above-mentioned further technical scheme, the control of regional traffic demand is divided for three ranks, and enter the traffic influx of presumptive area by the peripheral crossing that one-level demand control signal machine is controlled presumptive area, control the traffic influx of the main crossroads in the presumptive area by secondary demand control signal machine, also control the traffic influx at the less important crossing in the presumptive area with the bottleneck control strategy by three grades of demand control signal machines, thereby can classification the peripheral crossing of regulation and control presumptive area, therefore the traffic influx at main crossroads and less important crossing can alleviate zonal traffic congestion more effectively.
The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a transport need control method is characterized in that, the method comprises:
A, at each predetermined crossing of presumptive area demand control signal machine and front-end detector are set;
The traffic flow data at B, each each crossing of front-end detector Real-time Collection also deposits in the demand control signal machine that connects separately, and control center reads the traffic flow data of the current collection period of storing in each demand control signal machine every a collection period;
C, control center obtain current area traffic jamming state according to the traffic flow data that reads;
D, when current area traffic jamming state satisfies default demand control trigger condition, control center formulates regional traffic demand control strategy, and described regional traffic demand control strategy is sent to the demand control signal machine of appointment;
The demand control signal machine of E, described appointment is carried out received regional traffic demand control strategy.
2. the method for claim 1 is characterized in that,
Described demand control signal machine comprises: one-level demand control signal machine, secondary demand control signal machine and three grades of demand control signal machines;
Described front-end detector comprises: one-level front-end detector, secondary front-end detector and secondary front-end detector.
3. method as claimed in claim 2 is characterized in that, described steps A comprises:
Each peripheral crossing in presumptive area arranges one-level demand control signal machine and one-level front-end detector;
Each main crossroads in presumptive area arrange secondary demand control signal machine and secondary front-end detector;
At each less important crossing of presumptive area three grades of demand control signal machines and three grades of front-end detector are set.
4. such as claim 1 or 3 described methods, it is characterized in that, described step C comprises:
In described presumptive area, specify in advance at least one phase place at least one crossing;
Calculate the traffic intensity of each designated phase according to the traffic flow data that reads;
Traffic intensity zoning traffic intensity mean value according to each designated phase;
With described regional traffic average strength as current area traffic jamming state.
5. method as claimed in claim 3 is characterized in that, described step D comprises:
D1, judge that whether current area traffic jamming state satisfies default one-level transport need control trigger condition, if, execution in step D2 then; Otherwise, execution in step D5;
D2, control center formulate level-1 area transport need control strategy, and described level-1 area transport need control strategy is sent to one-level demand control signal machine;
D3, judge that whether current area traffic jamming state satisfies default secondary transport need control trigger condition, if, execution in step D4 then; Otherwise, execution in step D5;
D4, control center formulate level-2 area transport need control strategy, and described level-2 area transport need control strategy is sent to secondary demand control signal machine;
D5, judge whether current area traffic jamming state satisfies transport need control termination condition, if, execution in step D6 then; Otherwise, postpone a delay period after, return execution in step D1;
D6, control center send the recovery instruction to one-level demand control signal machine and secondary demand control signal machine, so that described one-level demand control signal machine and secondary demand control signal machine recover to carry out initial traffic control scheme according to described recovery instruction.
6. method as claimed in claim 5 is characterized in that, described formulation level-1 area transport need control strategy comprises:
According to the traffic intensity at each crossing at one-level demand control signal machine place, determine the signal period at described each crossing;
The traffic flow data at each crossing that gathers according to each one-level front-end detector is determined the permission rate of inflow at each crossing at one-level demand control signal machine place;
According to determined signal period and permission rate of inflow, each phase place split at each crossing at first order calculation demand control signal machine place.
7. method as claimed in claim 5 is characterized in that, described formulation level-2 area transport need control strategy comprises:
According to the traffic intensity at each crossing at secondary demand control signal machine place, determine the signal period at described each crossing;
The traffic flow data at each crossing that gathers according to each secondary front-end detector is determined the permission rate of inflow at each crossing at secondary demand control signal machine place;
According to determined signal period and permission rate of inflow, calculate each phase place split at each crossing at secondary demand control signal machine place.
8. a transport need control system is characterized in that, this system comprises: control center, be arranged on a plurality of demand control signal machines and a plurality of front-end detector at each predetermined crossing of presumptive area; Wherein,
Described front-end detector is used for the traffic flow data at each crossing of Real-time Collection, and the traffic flow data that gathers is deposited in the connected demand control signal machine;
Described control center is used for reading every a collection period traffic flow data of the current collection period that each demand control signal machine stores, and obtains current area traffic jamming state according to the traffic flow data that reads; Also be used for when current area traffic jamming state satisfies default demand control trigger condition, formulating regional traffic demand control strategy, and described regional traffic demand control strategy being sent to the demand control signal machine of appointment;
Described demand control signal machine for the traffic flow data at each crossing of storing connected front-end detector Real-time Collection, also is used for carrying out received regional traffic demand control strategy.
9. system as claimed in claim 8 is characterized in that,
Described demand control signal machine comprises: one-level demand control signal machine, secondary demand control signal machine and three grades of demand control signal machines.
Described front-end detector comprises: one-level front-end detector, secondary front-end detector and secondary front-end detector.
10. system as claimed in claim 8 is characterized in that:
Described control center is also at least one phase place of specifying in advance at least one crossing in described presumptive area; Calculate the traffic intensity of each designated phase according to the traffic flow data that reads; Traffic intensity zoning traffic intensity mean value according to each designated phase; With described regional traffic average strength as current area traffic jamming state.
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