CN102005122B - Multi-ramp conditioning method and system - Google Patents
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- CN102005122B CN102005122B CN 201010555435 CN201010555435A CN102005122B CN 102005122 B CN102005122 B CN 102005122B CN 201010555435 CN201010555435 CN 201010555435 CN 201010555435 A CN201010555435 A CN 201010555435A CN 102005122 B CN102005122 B CN 102005122B
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Abstract
The invention discloses a multi-ramp conditioning method comprising the following steps: obtaining a local regulation rate by a local ramp controller according to traffic flow; according to an arrival rate and a passing rate, obtaining a local queuing length; judging whether the local queuing length is less than a threshold value; if yes, stopping feeding back the local queuing length to a coordination center; if no, feeding back the local queuing length to the coordination center, and receiving the distribution to the local regulation rate by the coordination center; and performing the distribution to the local regulation rate by the coordination center. The invention also discloses a multi-ramp conditioning system. By the multi-ramp conditioning method and system disclosed by the invention, the feedback of the local ramp controller and the regulation of the coordination center cause a bus importing area to have ordered traffic flow, the time headway of the bus is reasonable, the queue of the inlet ramp is controlled within a certain range without extending to a ground road.
Description
Technical field
The present invention relates to traffic and regulate, relate in particular to a kind of multi-ramp conditioning method and system thereof.
Background technology
At present, what regulate that the traffic flow of overpass main line adopts is that Ramp is coordinated to control, and enters the volume of traffic of through street by control, makes the parameters such as traffic flow flow, density, speed of whole through street operate in optimum condition, improves service level thereby make.
The essence of On-ramp Control is that the entrance traffic flow is re-started distribution on time and space, and wherein a part of vehicle permission enters, and another part vehicle is waited on ring road, waits for an opportunity to enter, and some vehicle selects other alternative route to travel.The ramp metering rate is calculated each cycle Entrance ramp according to main line and Regional Traffic Flow and is allowed the vehicle number that enters as calculating, and it arranges coordinates particularly important to the road of Ramp.Common multi-ramp conditioning method has two kinds at present: (1) adopts the secured adjusted rate, 2 car/green, and namely a green light is crossed 2 cars; (2) adopt the self-adaptation regulation rate, according to main line, ground and the regional traffic flow of linking, automatically calculate and allow the current vehicle number of per cycle permission.When the main line magnitude of traffic flow larger, and the transport need of import ring road is also in larger situation, very likely guaranteeing that main line imports smoothly under target, the import ring road has certain vehicle queue, oversize if queue up, can queue up spills into adjacent highway section, ground and crossing, causes block up diffusion and transfer.
Therefore, those skilled in the art is devoted to develop a kind of multi-ramp conditioning method accurately.
Summary of the invention
Because the defects of prior art, technical matters to be solved by this invention is to provide according to local traffic flow situation responds to calculating, then be optimized the control method of the regulation rate of each Entrance ramp of global adaptation by upper strata Consultation Center based on regional traffic.
For achieving the above object, the invention provides a kind of multi-ramp conditioning method, comprise the following steps: local ramp controller obtains local regulation rate according to traffic flow; Obtain local queue length according to arrival rate and percent of pass; Judge that whether described local queue length is less than threshold value; If less than described threshold value, not to the described local queue length of Consultation Center's feedback; If more than or equal to described threshold value, feed back described local queue length to described Consultation Center, and receive described adjusting center to the distribution of described local regulation rate; Carry out described Consultation Center to the distribution of described local regulation rate.
In better embodiment of the present invention, described local ramp controller obtains this step of local regulation rate according to traffic flow and comprises the following steps: described local ramp controller historical statistics or measure in real time the ring road downstream capacity; Calculate described local regulation rate according to ring road upstream transport need and described ring road downstream capacity, setting regulating cycle is n minute, r (t)=(c
a-q
d(t-1)) * (n*60)/3600, wherein, r (t) is the regulation rate in Tk≤t≤T (k+1) time, q
d(t-1) be ring road upstream transport need in (k-1) T＜=t＜=kT time, c
aBe the ring road downstream capacity.
In another better embodiment of the present invention, if more than or equal to described threshold value, feed back described local queue length to described Consultation Center, and it is further comprising the steps of to this step of distribution of described local regulation rate to receive described adjusting center: the described local queue length of described local ramp controller feedback is to described Consultation Center; Interior other entry gate controllers send region request to the zone in described Consultation Center; Other queue lengths of other entry gate controllers in described Consultation Center receiving area; Described Consultation Center is dispensed to other queue lengths less than the Entrance ramp of threshold value with the difference of local queue length and threshold value; Described local ramp controller receives the feedback of described Consultation Center, and distributes local regulation rate according to described local queue length.
In another better embodiment of the present invention, further comprising the steps of: described local ramp controller is as judging that the Entrance ramp queue length less than threshold value, further judges whether to have received the region request of described Consultation Center; If do not receive described region request, carry out the distribution of described Consultation Center; If received described region request, feed back the value more than needed of local queue length to described Consultation Center; Receive described Consultation Center to the coordination of described local queue length, and carry out the further distribution of described Consultation Center.
In another better embodiment of the present invention, comprise the following steps according to arrival rate and this step of the local queue length of percent of pass acquisition: set the period of the described local queue length of statistics and the measurement period of described period; Described local ramp controller is added up arrival rate and the percent of pass of vehicle in each cycle according to measurement period; Judge that whether described arrival rate is greater than described percent of pass; If described arrival rate is less than or equal to described percent of pass, without local queue length; Produce local queue length if described arrival rate greater than described percent of pass, is judged, continue arrival rate and the percent of pass of vehicle in each cycle of statistics in described statistical time range; Obtain respectively the number that passes through of the arrival number of vehicle in statistical time range and vehicle according to the percent of pass of the arrival rate of described vehicle in each cycle and described vehicle; The difference of passing through number according to the arrival number of described vehicle and described vehicle obtains described local queue length.
In another kind of better embodiment of the present invention, described according to described vehicle in described each cycle arrival rate and the percent of pass of the described vehicle arrival number that obtains respectively vehicle in statistical time range and vehicle pass through these steps of number by described local ramp controller draw calculation arrival rate curve and percent of pass curve, and obtain according to the area between described arrival rate curve and described percent of pass curve.
In another kind of better embodiment of the present invention, described arrival rate curve is the curve that in described statistical time range, the arrival rate in each cycle connects, and described percent of pass curve is the curve that in described statistical time range, the percent of pass in each cycle connects.
The present invention also provides a kind of Ramp regulating system, comprising: local ramp controller, be used for obtaining local regulation rate according to traffic flow, and obtain local queue length according to arrival rate and percent of pass, and judge the difference between described local queue length and threshold value; Other ramp controllers are a plurality of ramp controllers outside the local ramp controller in described zone, and the queue length that is used for other ring road entrances of feedback and regulation rate be described Consultation Center extremely; Consultation Center, be used for receiving queue up in this locality that described local ramp controller feeds back and the information of threshold value between difference, and according to described difference, the regulation rate of described local ramp controller and described other ramp controllers is coordinated.
Multi-ramp conditioning method provided by the present invention and system thereof, the regulation rate of each Entrance ramp of global adaptation, according to the Entrance ramp queue length, carrying out accurate Ramp based on hierarchical feedback regulates, road main line catchment area wagon flow is orderly, the main line time headway is reasonable, and Entrance ramp queues up and to be controlled at certain limit, does not extend to the surface road technique effect.
Be described further below with reference to the technique effect of accompanying drawing to design of the present invention, concrete structure and generation, to understand fully purpose of the present invention, feature and effect.
Description of drawings
Fig. 1 is the process flow diagram of multi-ramp conditioning method of the present invention;
Fig. 2 is the schematic diagram of Ramp regulating system of the present invention;
Fig. 3 is the rate that reaches of local ramp controller drafting in multi-ramp conditioning method of the present invention and system thereof and the curve map of percent of pass.
Embodiment
Be illustrated in figure 1 as the process flow diagram of multi-ramp conditioning method of the present invention.
In step S100, local ramp controller obtains local regulation rate according to traffic flow.Be specially: described local ramp controller historical statistics or measure in real time the ring road downstream capacity; Calculate described local regulation rate according to ring road upstream transport need and described ring road downstream capacity, setting regulating cycle is n minute, r (t)=(c
a-q
d(t-1)) * (n*60)/3600, wherein, r (t) is the regulation rate in Tk≤t≤T (k+1) time, q
d(t-1) be ring road upstream transport need in (k-1) T＜=t＜=kT time, c
aBe the ring road downstream capacity.
In step S102, local ramp controller obtains local queue length according to arrival rate and percent of pass.Be specially: set the period of the described local queue length of statistics and the measurement period of described period; Described local ramp controller is added up arrival rate and the percent of pass of vehicle in each cycle according to measurement period; Judge that whether described arrival rate is greater than described percent of pass; If described arrival rate is less than or equal to described percent of pass, without local queue length; Produce local queue length if described arrival rate greater than described percent of pass, is judged, continue arrival rate and the percent of pass of vehicle in each cycle of statistics in described statistical time range; Obtain respectively the number that passes through of the arrival number of vehicle in statistical time range and vehicle according to the percent of pass of the arrival rate of described vehicle in each cycle and described vehicle; The difference of passing through number according to the arrival number of described vehicle and described vehicle obtains described local queue length.
In the present embodiment, in each cycle the percent of pass of the arrival rate of described vehicle and described vehicle obtain respectively the arrival number of vehicle in statistical time range and vehicle pass through several, be by described local ramp controller draw calculation arrival rate curve and percent of pass curve, and obtain according to the area between described arrival rate curve and described percent of pass curve.Described arrival rate curve is the curve that in described statistical time range, the arrival rate in each cycle connects, and described percent of pass curve is the curve that in described statistical time range, the percent of pass in each cycle connects.
In step S104, local ramp controller judges that whether described local queue length is less than threshold value.If less than threshold value, not to the described local queue length of Consultation Center's feedback.
If more than or equal to described threshold value, carry out step S106, the described local queue length of local ramp controller feedback is to described Consultation Center, and interior other ramp controllers send region request to the zone in Consultation Center.Be specially: the described local queue length of described local ramp controller feedback is to described Consultation Center; Interior other entry gate controllers send region request to the zone in described Consultation Center; Other queue lengths of other entry gate controllers in described Consultation Center receiving area; Described Consultation Center is dispensed to other queue lengths less than the Entrance ramp of threshold value with the difference of local queue length and threshold value; Described local ramp controller receives the feedback of described Consultation Center, and distributes local regulation rate according to described local queue length.
In step S110, local ramp controller receives described adjusting center to the distribution of described local regulation rate.
In step S116, carry out described Consultation Center to the distribution of described local regulation rate.
In present embodiment, in step S104, if local queue length less than threshold value, local ramp controller does not feed back local queue length to Consultation Center, enters step S108, has judged whether to receive the region request of described Consultation Center.If do not receive described region request, execution in step S116, local ramp controller is carried out the distribution of Consultation Center.
If received described region request, carry out step S112, the value more than needed of the local queue length of feedback is to described Consultation Center.Carry out step S114, receive described Consultation Center to the coordination of described local queue length, and carry out the further distribution of described Consultation Center in step S116.
As shown in Figure 2, be the schematic diagram of Ramp regulating system.The Ramp regulating system comprises local ramp controller 10, other ramp controllers 20 and Consultation Center 30.
Local ramp controller 10 is used for obtaining local regulation rate according to traffic flow, obtains local queue length according to arrival rate and percent of pass, and judges the difference between described local queue length and threshold value.Other ramp controllers 20 are a plurality of ramp controllers outside local ramp controller in described zone, and the queue length that is used for other ring road entrances of feedback and regulation rate be described Consultation Center 30 extremely.Wherein, Consultation Center 30 is the control centers to all elevated road ramps, if queue length in controlled range, controlled range is a threshold value, general queue length also has 30 meters apart from the highway section, ground, is controlled range.
In the present embodiment, local ring road device 10 is responded to calculating according to local traffic flow situation, then (normality traffic, unbalanced traffic, bottleneck traffic, a certain Entrance ramp queue up long etc. state) is optimized by Consultation Center 30 based on regional traffic, the regulation rate of the local ring road device 10 of global adaptation and other ring road devices 20.
Local ramp controller 10 feeds back to Consultation Center 30 with regulation rate, and other Entrance ramps are without coordinating requirement, if that upper ring road is queued up is very long, surpasses controlled range, has extended to ground, can send the request of controlling with adjacent ring road, overhead coordination.Carry out the control strategy that local local optimum obtains, adopt regulation rate to show the time of traffic lights.Otherwise revising regulation rate by the cooperation layer requirement carries out again.Revising regulation rate is calculated by Consultation Center 30.
Setting regulating cycle is n minute, local regulation rate r (t)=(ca-qd (t-1)) * (n*60)/3600, wherein, r (t) is the regulation rate in Tk≤t≤T (k+1) time, qd (t-1) is ring road upstream transport need in (k-1) T＜=t＜=kT time, and ca is the ring road downstream capacity.In the present embodiment, described local ramp controller 10 is according to described arrival rate and described percent of pass calculating and plotting arrival rate curve and percent of pass curve, and obtains the local queue length of local ring road according to the area between described arrival rate curve and described percent of pass curve.
Local ramp controller 10 is based on the queue length of this cycle regulation rate estimation Entrance ramp, when the Entrance ramp vehicle queue length surpasses certain threshold value, local ramp controller 10 sends to this regional Consultation Center 30 and coordinates to control request, requires the regulation rate added value.
Difference between this locality queuing that Consultation Center's 30 described local ramp controllers 10 of reception feed back and the information of threshold value, and according to described difference, described local ramp controller 10 is coordinated with the regulation rate of described other ramp controllers 20.For example: have 5 troops queuing up for tickets, these 5 troops are mutually invisible.One of them 1 people of troop seldom, 2 people queue up, and troop 4, troop 5 has 20 people to queue up, this troop 1 will tell the center so, the people is few here, troop 4 is told at the center again, troop 5 can go queuing to troop 1.Be used on ring road, be exactly ring road 1 wagon flow seldom, ring road 2 is queued up very long, after Consultation Center is known so, will give the longer green light of ring road 2, bring up to 20s by original 10s, and ring road 1 just can reduce its green light.
The rate that reaches of local ramp controller drafting and the curve map of percent of pass as shown in Figure 3.
It is the key link that the Entrance ramp coordination control strategy is implemented that queue length is calculated, and in present embodiment, counts on the data such as detection bases the queue length of this ring road of dynamic estimation at main line upstream and downstream, Entrance ramp.
Calculating the needed parameter of queue length can be: the regulation rate of the flow rate of present situation 5min peak period, 6min, 15min, the main line of prediction, ring road traffic flow rate and present situation ring road, time headway etc.Adopt the form of arrival rate and percent of pass to calculate the queuing vehicle number, flow rate with present situation 6min peak period, it is the vehicle number that 6min passes through, and the regulation rate of ring road is example, arrive-situation by vehicle arrival rate and percent of pass in expression 1h, transverse axis take 6min as one computing time the interval, be 0.1 hour, the right side longitudinal axis represents arrival rate or percent of pass, and each little lattice represents 100/h, can add up at most the situation in 1.6h.
Run a curve according to arrival rate, the percent of pass of the every 6min that adds up.Begin in that of arrival rate＞percent of pass, vehicle begins to incur loss through delay; Before this point, vehicle is not incured loss through delay.
In figure, A arrives, and B passes through, and begins from that begins to queue up, and the input of the arrival rate in each time interval A is reached that delegation, and B is by that delegation in the percent of pass input, and calculates two areas between curve.△ represents that A arrival deducts B and passes through in form.
The accumulative total △ value that local ring road device 10 calculated in each time interval when percent of pass＞arrival rate that, adds up the △ value and begins to reduce, and queuing up begins to dissipate.Determine maximum △ value, the accumulative total △ value of maximum, and calculate the mean delay of maximum queuing vehicle number, total delay time, total delay vehicle, vehicle.
The arrival number of queuing vehicle number=total-total pass through number, queue length=△ * 0.1 * 100, wherein, 0.1 be that horizontal ordinate represents 6Min, the 100th, ordinate, every lattice represent 100 cars, namely queuing up equals △ * 10, when the difference of arrival rate and percent of pass is maximum, queues up the longest.The vehicle number that △ * 10 expression is queued up, the delay in each 6min vehicle number * time interval 6min that equals to queue up.For example, the △ of a certain row=3.2, the delay of 6min is 3.2*10*6/60=3.2h, total delay equals the delay sum of all 6min, i.e. total delay=∑ △.
Multi-ramp conditioning method provided by the present invention and system thereof, the thought of using hierarchical coordinative optimization to calculate proposes the Ramp conciliation rate computing method based on hierarchical feedback, the regulation rate of each Entrance ramp of global adaptation; According to the Entrance ramp queue length, to carry out accurate Ramp based on hierarchical feedback and regulate, road main line catchment area wagon flow is orderly, and the main line time headway is reasonable, and Entrance ramp queues up and be controlled at certain limit, does not extend to the surface road technique effect.
More than describe preferred embodiment of the present invention in detail.The ordinary skill that should be appreciated that this area need not creative work and just can design according to the present invention make many modifications and variations.Therefore, all technician in the art all should be in claim protection domain of the present invention under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (3)
1. a multi-ramp conditioning method, is characterized in that, comprises the following steps:
Local ramp controller obtains local regulation rate according to traffic flow;
Obtain local queue length according to arrival rate and percent of pass;
Judge that whether described local queue length is less than threshold value;
If less than described threshold value, not to the described local queue length of Consultation Center's feedback;
If more than or equal to described threshold value, feed back described local queue length to described Consultation Center, and receive described Consultation Center to the distribution of described local regulation rate;
Carry out described Consultation Center to the distribution of described local regulation rate;
Wherein, if more than or equal to described threshold value, feed back described local queue length to described Consultation Center, and receive described Consultation Center to the distribution of described local regulation rate, this step is further comprising the steps of:
The described local queue length of described local ramp controller feedback is to described Consultation Center;
Interior other entry gate controllers send region request to the zone in described Consultation Center;
Other queue lengths of other entry gate controller feedbacks in described Consultation Center receiving area;
Described Consultation Center is dispensed to other queue lengths less than the Entrance ramp of threshold value with the difference of local queue length and threshold value;
Described local ramp controller receives the feedback of described Consultation Center, and described Consultation Center distributes local regulation rate according to described local queue length;
Wherein, described multi-ramp conditioning method, further comprising the steps of:
Described local ramp controller is as judging that the Entrance ramp queue length less than threshold value, further judges whether to have received the region request of described Consultation Center;
If do not receive described region request, carry out the distribution of described Consultation Center;
If received described region request, feed back the value more than needed of local queue length to described Consultation Center;
Receive described Consultation Center to the coordination of described local queue length, and carry out the further distribution of described Consultation Center;
Wherein, comprise the following steps according to arrival rate and this step of the local queue length of percent of pass acquisition:
Set the period of the described local queue length of statistics and the measurement period of described period;
Described local ramp controller is added up arrival rate and the percent of pass of vehicle in each cycle according to measurement period;
Judge that whether described arrival rate is greater than described percent of pass;
If described arrival rate is less than or equal to described percent of pass, without local queue length;
Produce local queue length if described arrival rate greater than described percent of pass, is judged, continue arrival rate and the percent of pass of vehicle in each cycle of statistics in described statistical time range;
Obtain respectively the number that passes through of the arrival number of vehicle in statistical time range and vehicle according to the percent of pass of the arrival rate of described vehicle in each cycle and described vehicle;
The difference of passing through number according to the arrival number of described vehicle and described vehicle obtains described local queue length;
Wherein, described according to described vehicle in described each cycle arrival rate and the percent of pass of the described vehicle arrival number that obtains respectively vehicle in statistical time range and vehicle pass through these steps of number by described local ramp controller draw calculation arrival rate curve and percent of pass curve, and according to the aggregate-value acquisition of described arrival rate curve and described percent of pass curve.
2. multi-ramp conditioning method according to claim 1, it is characterized in that: described arrival rate curve is the curve that in described statistical time range, the arrival rate in each cycle connects, and described percent of pass curve is the curve that in described statistical time range, the percent of pass in each cycle connects.
3. a Ramp regulating system, is characterized in that, comprising:
Local ramp controller is used for obtaining local regulation rate according to traffic flow, obtains local queue length according to arrival rate and percent of pass, and judges the difference between described local queue length and threshold value;
Other ramp controllers are a plurality of ramp controllers outside the local ramp controller in the zone, are used for the queue length of other ring road entrances of feedback and regulation rate to Consultation Center;
Consultation Center is used for receiving local queue length that described local ramp controller feeds back and the difference between threshold value, and according to described difference, the regulation rate of described local ramp controller and described other ramp controllers is coordinated;
Wherein, described local ramp controller is according to described arrival rate and described percent of pass calculating and plotting arrival rate curve and percent of pass curve, and obtains the local queue length of local ring road according to the area between described arrival rate curve and described percent of pass curve.
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| CN107610486B (en) * | 2017-08-04 | 2023-05-23 | 华南理工大学 | Coordination control system for expressway toll collection system and junction signal intersection |
| CN108053658B (en) * | 2017-11-15 | 2021-06-04 | 同济大学 | Expressway multi-turn-road coordination control method for congestion full-chain management |
| CN108510758B (en) * | 2018-05-24 | 2020-07-31 | 金陵科技学院 | Urban expressway entrance ramp signal control method based on video real-time information |
| CN108648469B (en) * | 2018-06-13 | 2021-04-06 | 西华大学 | Ramp coordination control method based on multi-bottleneck condition |
| CN109300316B (en) * | 2018-07-12 | 2022-07-12 | 天津易华录信息技术有限公司 | Road blockage relieving control method, system and equipment |
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