CN112435473B - Expressway traffic flow tracing and ramp regulating method combined with historical data - Google Patents

Expressway traffic flow tracing and ramp regulating method combined with historical data Download PDF

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CN112435473B
CN112435473B CN202011272285.6A CN202011272285A CN112435473B CN 112435473 B CN112435473 B CN 112435473B CN 202011272285 A CN202011272285 A CN 202011272285A CN 112435473 B CN112435473 B CN 112435473B
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upstream
road section
adjusted
ramp
traffic
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CN112435473A (en
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刘东波
徐棱
张宾
何广进
刘成生
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Traffic Management Research Institute of Ministry of Public Security
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Traffic Management Research Institute of Ministry of Public Security
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
    • G08G1/0125—Traffic data processing
    • G08G1/0129—Traffic data processing for creating historical data or processing based on historical data
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/07—Controlling traffic signals
    • G08G1/08—Controlling traffic signals according to detected number or speed of vehicles
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
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    • G08G1/095—Traffic lights

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Abstract

The invention provides an expressway traffic flow tracing and ramp regulating method combined with historical data, which can automatically and accurately regulate and control the traffic flow of an expressway without manual interference, further relieve the blockage problem of the expressway and obtain a more accurate traffic regulating and controlling effect. According to the technical scheme, the traffic flow ratio corresponding to each upstream ramp in the traffic flow of the congestion point of the road section to be adjusted is obtained according to the historical data of the traffic flow of the upstream ramps; when a current limiting control scheme is established for the upstream ramps, the number of vehicles to be released of each upstream ramp is calculated according to the traffic flow ratio corresponding to each upstream ramp, and the duration time of the green light and the red light in the next control period of the road section to be adjusted.

Description

Expressway traffic flow tracing and ramp regulating method combined with historical data
Technical Field
The invention relates to the technical field of intelligent traffic control, in particular to a method for tracing a highway traffic flow and regulating a ramp by combining historical data.
Background
The urban expressway is a major transportation road for bearing the traffic demand of long distance in an urban road network, and the traffic efficiency of the whole city is influenced by the traffic efficiency. In recent years, the demand for express way traffic in each big city is rapidly increased, and part of main line sections are often in a crowded or blocked state due to the large amount of traffic flowing into the ramp. The root cause of highway traffic congestion is that demand is greater than supply, creating a bottleneck point. Under the condition of a certain traffic capacity, the prior art regulates the inflow of vehicles by controlling an upstream ramp, and further prevents a main line traffic flow from being in an oversaturated state. However, limited by the conventional detection and communication technology, when an upstream ramp needs to be controlled due to congestion, detailed vehicle OD (Origin Destination) data cannot be acquired to calculate the degree of association between the congestion and the traffic volume of each upstream ramp, and the congestion source of a bottleneck road section is traced back.
Disclosure of Invention
In order to solve the problem that in the prior art, the traffic flow of an upstream ramp can only be manually controlled to further solve the problem that the express way is blocked and cannot be accurately regulated, the invention provides an express way traffic flow tracing and ramp regulating method combined with historical data, which can automatically and accurately regulate the traffic flow of the express way without manual interference, further relieve the problem of the blockage of the express way and obtain a more accurate traffic regulating effect.
The technical scheme of the invention is as follows: a method for tracing the source of express way traffic flow and regulating and controlling ramp by combining historical data is characterized by comprising the following steps:
s1: determining a road section to be adjusted and a congestion point;
setting the coming direction of each vehicle on the road section to be adjusted to comprise: an upstream section and an upstream ramp of the section;
monitoring points are respectively arranged at the upstream and the downstream of all the upstream ramps of the road section to be adjusted, the congestion point of the road section to be adjusted and the congestion point of the road section to be adjusted; setting traffic detectors at all the monitoring points;
s2: setting a statistical time period; collecting vehicle information of vehicles passing through all the monitoring points in the statistical time period; then obtaining the traffic flow passing through the adjusting road section and each upstream ramp in the statistical time period;
the vehicle information includes: vehicle identity, time of passage;
s3: respectively calculating the proportion of the traffic flow in the statistical time period according to the difference of the incoming directions of the traffic; obtaining the traffic flow occupation ratio corresponding to each upstream ramp;
s4: presetting a monitoring period, and monitoring the real-time traffic state of the road section to be adjusted according to the monitoring period;
confirming the real-time traffic state of the road section to be adjusted;
if the real-time traffic state of the road section to be adjusted is in the normal traffic state, circularly executing the step S4;
otherwise, go to step S5;
s5: when the road section to be adjusted needs to carry out flow control, a flow limiting control scheme is formulated:
the current limiting control scheme comprises the following steps:
a 1: monitoring the current inflow and outflow traffic flow by utilizing the traffic detectors at the upstream and the downstream of the congestion point of the road section to be adjusted, and calculating the number of vehicles to be controlled in the current flow limiting control scheme based on the traffic capacity of the road section to be adjusted;
a 2: calculating the number of vehicles released on an upstream ramp allowed to be released on each upstream ramp based on the number of vehicles to be controlled and the traffic flow occupation ratio of the upstream ramps;
a 3: according to the number of vehicles released on the upstream ramp, calculating the duration time of green light and red light in the next control period of the upstream ramp;
s6: executing the current limit control scheme; simultaneously monitoring the traffic state of the road section to be adjusted in real time;
if the real-time traffic state of the road section to be adjusted is recovered to a normal traffic state, the upstream ramp is withdrawn from the current-limiting control scheme; circularly executing the steps S4 to S6;
otherwise, steps S4-S6 are executed in a loop.
It is further characterized in that:
in step S2, the process of collecting the vehicle information of the vehicle passing through the monitoring point includes the steps of:
b 1: setting the statistical time period as k and the acquisition ending time as t moment;
then, the time from t-k to t is collected, and the distance from the t-k to t passes through the road section to be adjustedThe information of the vehicle to be analyzed is as follows:
Figure BDA0002778093290000021
b 2: setting all the upstream ramps of the road section to be adjusted to be RiWherein: n, n is the number of the upstream ramps of the road section to be adjusted and is a positive integer;
the upstream ramp RiThe corresponding vehicle passing data extraction starting and stopping time period is
Figure BDA0002778093290000022
Based on each of the upstream ramps RiUpper monitoring point, extracted at
Figure BDA0002778093290000023
Inner passage ramp RiThe information set of the ramp passing car body part is
Figure BDA0002778093290000024
Wherein,
Figure BDA0002778093290000025
for vehicles from said up-ramp RiThe maximum travel time required for the upper monitoring point to travel to the congestion point of the road section to be adjusted;
Figure BDA0002778093290000026
the vehicle goes from the upstream ramp RiThe shortest travel time is required for the upper monitoring point to travel to the congestion point of the road section to be adjusted;
the maximum travel time
Figure BDA0002778093290000027
And said minimum travel time
Figure BDA0002778093290000028
The calculation method of (2) is as follows:
setting: the upstream ramp RiThe distance from the upper monitoring point to the congestion point of the road section to be adjusted is DISTiThe speed limit value of the road section to be adjusted is SPDmax；
Figure BDA0002778093290000029
Figure BDA00027780932900000210
Wherein,
Figure BDA00027780932900000211
for the above-mentioned upstream ramp RiDriving the vehicle on the road section between the congestion points of the road section to be adjusted by the upper monitoring point, and obtaining the average speed between the time t-k and the time t; alpha is a modified positive coefficient;
in step S3, each of the upstream ramps R is calculatediThe corresponding process of traffic flow ratio comprises the following steps:
c 1: sequentially taking out the information of the vehicles to be analyzed
Figure BDA00027780932900000212
Each of the vehicle passing part information sjWherein: j is
Figure BDA00027780932900000213
The number of the medium identity information is a positive integer;
c 2: will sjPassing vehicle part information sets on each ramp respectively
Figure BDA00027780932900000214
Searching;
c 3: for each of said up-flow ramps RiSetting a source traffic count
Figure BDA00027780932900000215
If at
Figure BDA0002778093290000031
In which s is retrievedjThen the upstream ramp R is connectediCorresponding source traffic volume count
Figure BDA0002778093290000032
Adding one;
until the information of the passing vehicle to be analyzed
Figure BDA0002778093290000033
Each of the vehicle passing part information sjAfter all the upstream ramps are searched, each upstream ramp R at the time of t is obtainediCorresponding source traffic volume count
Figure BDA0002778093290000034
c 4: each of the upstream ramps R is arrangediThe corresponding passing traffic flow has the ratio of
Figure BDA0002778093290000035
Figure BDA0002778093290000036
Wherein: n is the number of the upstream ramps of the road section to be adjusted and is a positive integer;
in step a1, the number of vehicles to be controlled F in the current limiting control schemecutThe calculation method comprises the following steps:
setting the monitoring period as C, wherein C is an integral multiple of k of the statistical time period;
the monitoring period is within C, and the inflow traffic flow of the road section to be adjusted is FinThe flow rate of the outgoing vehicle is FoutThe traffic capacity of the road section to be adjusted is FmaxWherein F isin、Fout、FmaxThe unit of (A) is: passenger car equivalent weight is pcu/h per hour;
Figure BDA0002778093290000037
wherein, Fi hFor each of said up-flow ramps RiThe hourly inflow of (a), in units of pcu/h;
in step a2, each of the up-flow ramps RiNumber of vehicles P released on the upstream ramp allowing releasei tThe calculation method comprises the following steps:
Figure BDA0002778093290000038
wherein: fi tFor each of the upstream ramps R at the time of the statistical time period k and tiCorresponding said source traffic count; fcutThe number of the vehicles to be controlled in the current limiting control scheme is determined;
Figure BDA00027780932900000311
for each of said up-flow ramps RiCorresponding traffic flow ratio; c is the monitoring period;
in step a3, the upstream ramp RiOf the next control period
Figure BDA00027780932900000312
And duration of red light
Figure BDA00027780932900000313
The calculation method comprises the following steps:
Figure BDA0002778093290000039
Figure BDA00027780932900000310
and ht is the headway time in the lane saturated flow under the control of the signal on the road section to be adjusted.
According to the expressway traffic flow tracing and ramp regulating method combining historical data, the passing traffic flow ratio corresponding to each upstream ramp in the traffic flow of the congestion point of the road section to be regulated is obtained according to the historical data of the traffic flow of the upstream ramp; when a current limiting control scheme is established for the upstream ramps, the number of vehicles released on each upstream ramp is calculated according to the traffic flow ratio corresponding to each upstream ramp, and the duration time of a green light and a red light in the next control period of the road section to be adjusted; according to the technical scheme, the current-limiting control scheme is obtained without manual experience adjustment and is obtained by calculation according to historical data of the upstream ramp, so that the current-limiting control scheme is high in designated speed and efficiency, and the problem of blockage of an express way can be quickly solved; meanwhile, a more targeted current limiting control scheme is formulated for each upstream ramp according to historical data of the upstream ramp, so that more targeted vehicle adjustment is ensured, the congestion problem of the congestion point of the road section to be adjusted can be accurately regulated, and a more accurate traffic regulation effect is obtained.
Drawings
FIG. 1 is a schematic flow chart of a method for tracing the source of express way traffic flow and regulating ramp by combining historical data;
FIG. 2 is a schematic diagram of an application scenario and a layout of detectors according to an embodiment of the present invention;
fig. 3 is a schematic view of a source tracing analysis according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the method for tracing the expressway traffic flow and regulating the ramp according to the historical data includes the following steps.
S1: determining a road section to be adjusted and a congestion point (marked as a congestion bottleneck point in figures 2 and 3) of the road section to be adjusted, which needs to be monitored and regulated in real time;
setting the coming direction of each vehicle on the road section to be adjusted comprises the following steps: an upstream section and an upstream ramp of the section;
monitoring points are respectively arranged at the upstream and the downstream of all upstream ramps of the road section to be adjusted, the congestion point of the road section to be adjusted and the congestion point of the road section to be adjusted; setting traffic detectors at all monitoring points;
as shown in fig. 2, as an application scenario of the embodiment of the present invention, a congestion point segment of an expressway with frequent congestion is set as a to-be-adjusted road segment, monitoring points are respectively set in front of congestion points of the to-be-adjusted road segment and upstream entrance ramps (R1-Rn), a traffic detector (such as video and RFID) with a vehicle identity recognition function is erected, and information such as vehicle identity and passing time passing through the detection points is collected and recorded.
S2: setting a statistical time period; collecting vehicle information of vehicles passing through all monitoring points within a statistical time period; then obtaining the traffic flow of each upstream ramp through adjusting the road sections in the statistical time period; the vehicle information includes: vehicle identity, time of passage;
a process for collecting vehicle information for vehicles passing through a monitoring point, comprising the steps of:
b 1: setting a statistical time period as k and an acquisition ending time as t moment; in the specific implementation process, the statistical time period k is set according to the traffic flow of a specific road section, and is generally set to be 1-2 min, so that the data can be ensured to be real-time data, the traffic state can be truly reflected, the data volume can be limited, and the calculated amount cannot be overlarge;
then, the information of the vehicle to be analyzed passing through the vehicle of the road section to be adjusted between the time t-k and the time t is collected as follows:
Figure BDA0002778093290000041
b 2: setting all the upstream ramps of the road section to be adjusted to be RiWherein: i is 1,2.. the n, i is the serial number of the upstream ramp, and n is the number of the upstream ramps of the road section to be adjusted and is a positive integer;
up-flow ramp RiThe corresponding vehicle passing data extraction starting and stopping time period is
Figure BDA0002778093290000042
On a per upstream basisRamp RiUpper monitoring point, extracted at
Figure BDA0002778093290000043
Inner passage ramp RiThe information set of the vehicle passing through the ramp is
Figure BDA0002778093290000044
Wherein,
Figure BDA0002778093290000045
for vehicles from the upstream ramp RiThe maximum travel time required for the upper monitoring point to travel to the congestion point of the road section to be adjusted;
Figure BDA0002778093290000046
vehicle upstream ramp RiThe shortest travel time is required for the upper monitoring point to travel to the congestion point of the road section to be adjusted;
maximum travel time
Figure BDA0002778093290000047
And minimum travel time
Figure BDA0002778093290000048
The calculation method comprises the following steps:
setting: up-flow ramp RiThe distance from the upper monitoring point to the congestion point of the road section to be adjusted is DISTiThe speed limit value of the road section to be adjusted is SPDmax；
Figure BDA0002778093290000051
Figure BDA0002778093290000052
Wherein,
Figure BDA0002778093290000053
is the above-mentioned upstream turnWay RiDriving a vehicle on a road section between congestion points of a road section to be adjusted by an upper monitoring point, and averaging the vehicle speed between the time t-k and the time t; alpha is a modified positive coefficient, and in the embodiment, the value is 3-5.
In the technical scheme of the invention, the current limiting scheme of each upstream ramp is calculated on the basis of the historical data of the upstream ramp; tracing analysis needs to be carried out on the congestion traffic flow of the congestion point; firstly, establishing an OD path from an entrance ramp detection point to a main line detection point before a congestion point, and acquiring longitude and latitude of a start point and a stop point of the OD path; in specific implementation, as shown in fig. 3, the inlet ramps R1 to R3 correspond to the paths OD1 to OD3, and the starting points of the paths OD1 to OD3 are the upstream ramps RiThe upper monitoring point and the terminal point are congestion points of the road section to be adjusted;
reading the average speed of all OD paths at each time point t (from t-k to t) according to the statistical time period k through a data access interface of an internet trip service platform (such as a Gauss map, a Baidu map and a drip … …)
Figure BDA00027780932900000513
Calculating the distance DIST of each section of OD according to the longitude and latitude coordinates of the start point and the stop pointiThe speed limit value of the road section to be adjusted is SPDmaxThat is, the time interval from t-k to t can be calculated, and the vehicles flow from the upstream ramp RiShortest travel time required for passing to congestion point
Figure BDA0002778093290000054
And maximum travel time
Figure BDA0002778093290000055
Setting: in the application scenarios shown in fig. 2 and 3, R1Distance to congestion point DIST1＝300mDIST1，R2Distance to congestion point DIST2＝1000m，R3Distance to congestion point DIST3＝1800m；
k is 120s, namely R is respectively obtained every 120s through a data interface of hundred degrees or high order1～R3To congestionAverage speed between bottleneck points to
Figure BDA0002778093290000056
Speed limit value of road section to be adjusted
Figure BDA0002778093290000057
For example, calculate ramp R1～R3The fastest time to the congestion point can be calculated within the time period from t-120s to t, and the ramp R1～R3The shortest travel time required for passing to the congestion point
Figure BDA0002778093290000058
Figure BDA0002778093290000059
Figure BDA00027780932900000510
Figure BDA00027780932900000511
Then, the positive coefficient alpha is modified to 3, and the corresponding longest travel time
Figure BDA00027780932900000512
Comprises the following steps:
Figure BDA0002778093290000061
Figure BDA0002778093290000062
Figure BDA0002778093290000063
then the upstream ramp RiThe corresponding vehicle passing data extraction starting and stopping time period is
Figure BDA0002778093290000064
R1And (3) extracting a corresponding vehicle passing data start-stop time period:
Figure BDA0002778093290000065
R2and (3) extracting a corresponding vehicle passing data start-stop time period:
Figure BDA0002778093290000066
R3and (3) extracting a corresponding vehicle passing data start-stop time period:
Figure BDA0002778093290000067
acquiring vehicle information to be analyzed of vehicles passing through a road section to be adjusted between the time t-120s and the time t:
Figure BDA0002778093290000068
based on each upstream ramp RiUpper monitoring point, extracted at
Figure BDA0002778093290000069
Inner passage ramp RiThe information set of the ramp passing car body part is
Figure BDA00027780932900000610
Then there are:
Figure BDA00027780932900000611
Figure BDA00027780932900000612
Figure BDA00027780932900000613
s3: respectively calculating the proportion of the traffic flow in the statistical time period according to the difference of the incoming directions of the traffic; obtaining the traffic flow occupation ratio corresponding to each upstream ramp;
calculating each upstream ramp RiThe corresponding process of traffic flow ratio comprises the following steps:
c 1: sequentially extracting information of the vehicles to be analyzed
Figure BDA00027780932900000614
Each of the vehicle passing part information sjWherein: j is
Figure BDA00027780932900000615
The number of the medium identity information is a positive integer;
c 2: will sjInformation set of passing car body parts on each ramp respectively
Figure BDA00027780932900000616
Searching;
c 3: for each upstream ramp RiSetting a source traffic count
Figure BDA00027780932900000617
If at
Figure BDA00027780932900000618
In which s is retrievedjThen go up the ramp RiCorresponding source traffic count Fi tAdding one;
until the information of the passing vehicle is analyzed
Figure BDA0002778093290000071
Each of the vehicle passing part information sjAfter all the up-flow ramps are searched, obtaining R of each up-flow ramp at the time of tiCorresponding source traffic count Fi t；
c 4: each upstream ramp R is arrangediThe corresponding passing traffic flow has the ratio of
Figure BDA0002778093290000072
Figure BDA0002778093290000073
Wherein: n is the number of the upstream ramps of the road section to be adjusted and is a positive integer.
In the embodiment of the invention, the information of the vehicles to be analyzed is sequentially taken out
Figure BDA0002778093290000074
Each of the vehicle passing part information sjA1 is tojInformation set of passing car body parts on each ramp respectively
Figure BDA0002778093290000075
Searching; if at
Figure BDA0002778093290000076
In which s is retrievedjThen go up the ramp RiCorresponding source traffic count Fi tAdding one; then there are:
F1 t＝{1,2,3,4,5}
Figure BDA00027780932900000710
Figure BDA0002778093290000079
calculating R of each upstream rampiCorresponding traffic flow ratio
Figure BDA0002778093290000077
Figure BDA0002778093290000078
S4: presetting a monitoring period C, and monitoring the real-time traffic state of the road section to be adjusted according to the monitoring period C;
confirming the real-time traffic state of the road section to be adjusted;
if the real-time traffic state of the road section to be adjusted is in the normal traffic state, circularly executing the step S4; continuous monitoring ensures that abnormal traffic states can be found in time;
otherwise, when the real-time traffic state is in an abnormal state and flow control is needed, executing step S5;
when the method is specifically implemented, the real-time traffic state of the road section to be adjusted is judged based on the prior art, such as: and judging whether the congestion point of the road section to be adjusted on the express way is close to or has traffic congestion or not according to indexes such as occupancy, average speed, queue and the like detected by the detector.
S5: when the road section to be adjusted needs to carry out flow control, a flow limiting control scheme is formulated:
the current limiting control scheme comprises the following steps:
a 1: monitoring the current inflow and outflow traffic flow by utilizing the traffic detectors at the upstream and the downstream of the congestion point of the road section to be adjusted, and calculating the number of vehicles to be controlled in the current flow limiting control scheme based on the traffic capacity of the road section to be adjusted;
the number of vehicles F to be controlled in the current limiting control schemecutThe calculation method comprises the following steps:
setting a monitoring period as C, wherein C is an integral multiple of k in a statistical time period;
the monitoring period is within C, the inflow traffic flow of the road section to be adjusted is FinThe flow rate of the outgoing vehicle is FoutThe traffic capacity of the road section to be adjusted is FmaxWherein F isin、Fout、FmaxThe unit of (c) is: passenger car equivalent weight is pcu/h per hour;
Figure BDA0002778093290000081
wherein, Fi hFor each upstream ramp RiThe hourly inflow of (a), in units of pcu/h;
in this embodiment, let: fin＝2000pcu/h、Fout＝1500pcu/h、Fmax1500pcu/h, ramp R1～R3The hourly inflow of (a) is:
Figure BDA0002778093290000082
then:
Figure BDA0002778093290000083
a 2: calculating the number of vehicles released on an upstream ramp allowed to be released on each upstream ramp based on the number of vehicles to be controlled and the traffic flow occupation ratio of the upstream ramps;
each upstream ramp RiNumber of vehicles P released on the upstream ramp allowing releasei tThe calculation method comprises the following steps:
Figure BDA0002778093290000084
wherein:
Figure BDA0002778093290000085
for each upstream ramp R at the time of k and tiCorresponding source traffic volume counts; fcutThe number of vehicles should be controlled in the current limiting control scheme;
Figure BDA0002778093290000086
for each upstream ramp RiCorresponding traffic flow ratio; c is a monitoring period;
in this embodiment, the number of vehicles released on the upstream ramp Pi tThe calculation is as follows:
Figure BDA0002778093290000087
Figure BDA0002778093290000088
Figure BDA0002778093290000089
a 3: calculating the duration time of green light and red light in the next control period of the upstream ramp according to the number of vehicles released on the upstream ramp;
upstream ramp RiGreen duration in the next control cycle
Figure BDA00027780932900000810
Duration of red light
Figure BDA00027780932900000811
The calculation method comprises the following steps:
Figure BDA00027780932900000812
Figure BDA00027780932900000813
ht is the time headway in the lane saturated flow under the control of a signal on a road section to be adjusted;
wherein, the headway (time headway) refers to the vehicle queue that traveles on same lane, and the time interval, the unit that two continuous vehicle locomotive tip passed through a certain section: s/Veh.
In this embodiment, the upstream ramp RiDuration of green light in next control period
Figure BDA00027780932900000815
And duration of red light
Figure BDA00027780932900000816
Is calculated as follows:
Figure BDA00027780932900000814
Figure BDA0002778093290000091
Figure BDA0002778093290000092
Figure BDA0002778093290000093
Figure BDA0002778093290000094
Figure BDA0002778093290000095
to this end, each upstream ramp R is obtainediIncluding upstream ramps RiThe green and red light durations and the number of vehicles in clearance for the next control cycle.
S6: executing a current limit control scheme; simultaneously monitoring the traffic state of the road section to be adjusted in real time;
if the real-time traffic state of the road section to be adjusted is returned to the normal traffic state, the upstream ramp R is connected with the traffic control systemiExiting the current limit control scheme; circularly executing the steps S4-S6, and continuously monitoring the traffic state of the road section to be adjusted in real time and carrying out congestion control;
otherwise, if the road section to be adjusted is still in an abnormal traffic state, circularly executing the steps S4-S6, and based on the existing congestion control effect, further making a congestion control scheme in a targeted manner to implement congestion control; the real-time congestion regulation and control scheme is ensured to be specific to the existing traffic state, and the traffic state can be timely and effectively regulated.
According to the technical scheme, the acquisition of the proportion of the upstream ramp traffic flow of the congested traffic flow of the expressway is realized by the expressway congestion point traffic flow tracing analysis method combined with the historical traffic state; when congestion occurs, according to the magnitude of traffic volume of the ramps, distinguishing signal control schemes with different regulation rates for all the ramps, and performing current limiting and throttling control based on the source of a congestion point; the method provides accurate data support for congestion regulation and control decision and control of the expressway congestion point, is more targeted compared with the traditional mode of carrying out current-limiting control on all ramps in a one-view manner, is more targeted to congestion regulation and control of the expressway congestion point, and can obtain a better regulation and control effect.

Claims (3)

1. A method for tracing the source of express way traffic flow and regulating and controlling a ramp by combining historical data is characterized by comprising the following steps:
s1: determining a road section to be adjusted and a congestion point;
setting the coming direction of each vehicle on the road section to be adjusted to comprise: an upstream section and an upstream ramp of the section;
monitoring points are respectively arranged at the upstream and the downstream of all the upstream ramps of the road section to be adjusted, the congestion point of the road section to be adjusted and the congestion point of the road section to be adjusted; setting traffic detectors at all the monitoring points;
s2: setting a statistical time period; collecting vehicle information of vehicles passing through all the monitoring points in the statistical time period; then obtaining the traffic flow passing through the adjusting road section and each upstream ramp in the statistical time period;
the vehicle information includes: vehicle identity, time of passage;
s3: respectively calculating the proportion of the traffic flow in the statistical time period according to the difference of the incoming directions of the traffic; obtaining the traffic flow occupation ratio corresponding to each upstream ramp;
s4: presetting a monitoring period, and monitoring the real-time traffic state of the road section to be adjusted according to the monitoring period;
confirming the real-time traffic state of the road section to be adjusted;
if the real-time traffic state of the road section to be adjusted is in the normal traffic state, circularly executing the step S4;
otherwise, go to step S5;
s5: when the road section to be adjusted needs to carry out flow control, a flow limiting control scheme is formulated:
the current limiting control scheme comprises the following steps:
a 1: monitoring the current inflow and outflow traffic flow by utilizing the traffic detectors at the upstream and the downstream of the congestion point of the road section to be adjusted, and calculating the number of vehicles to be controlled in the current flow limiting control scheme based on the traffic capacity of the road section to be adjusted;
in step a1, the number of vehicles to be controlled F in the current limiting control schemecutThe calculation method comprises the following steps:
setting the monitoring period as C, wherein C is an integral multiple of k of the statistical time period;
the monitoring period is within C, and the inflow traffic flow of the road section to be adjusted is FinThe flow rate of the outgoing vehicle is FoutThe traffic capacity of the road section to be adjusted is FmaxWherein F isin、Fout、FmaxThe unit of (A) is: passenger car equivalent weight is pcu/h per hour;
Figure FDA0003569589930000011
wherein, Fi hFor each of said up-flow ramps RiThe hourly inflow of (a), in units of pcu/h;
a 2: calculating the number of vehicles released on an upstream ramp allowed to be released on each upstream ramp based on the number of vehicles to be controlled and the traffic flow occupation ratio of the upstream ramps;
step (ii) ofa2, each of the up-flow ramps RiNumber of vehicles P released on the upstream ramp allowing releasei tThe calculation method comprises the following steps:
Figure FDA0003569589930000012
wherein: fi tFor each of the upstream ramps R at the time of the statistical time period k and tiCorresponding source traffic volume counts; fcutThe number of the vehicles to be controlled in the current limiting control scheme is determined;
Figure FDA0003569589930000013
for each of said up-flow ramps RiCorresponding traffic flow ratio; c is the monitoring period;
a 3: according to the number of vehicles released on the upstream ramp, calculating the duration time of green light and red light in the next control period of the upstream ramp;
in step a3, the upstream ramp RiOf the next control period
Figure FDA0003569589930000021
And duration of red light
Figure FDA0003569589930000022
The calculation method comprises the following steps:
Figure FDA0003569589930000023
Figure FDA0003569589930000024
htm is the headway time distance in the lane saturated flow under the control of the signal on the road section to be adjusted;
s6: executing the current limit control scheme; simultaneously monitoring the traffic state of the road section to be adjusted in real time;
if the real-time traffic state of the road section to be adjusted is recovered to a normal traffic state, the upstream ramp is withdrawn from the current-limiting control scheme; circularly executing the steps S4 to S6;
otherwise, executing steps S4-S6 in a circulating manner;
in step S3, each of the upstream ramps R is calculatediThe corresponding process of traffic flow ratio comprises the following steps:
c 1: sequentially extracting information of the vehicles to be analyzed
Figure FDA0003569589930000025
Each of the vehicle passing part information sjWherein: j is
Figure FDA0003569589930000026
The number of the medium identity information is a positive integer;
c 2: will sjPassing vehicle part information sets on each ramp respectively
Figure FDA0003569589930000027
Searching;
c 3: for each of said up-flow ramps RiSetting a source traffic volume count Fi t；
If at
Figure FDA0003569589930000028
In which s is retrievedjThen the upstream ramp R is connectediCorresponding source traffic count Fi tAdding one;
until the information of the passing vehicle to be analyzed
Figure FDA0003569589930000029
Each of the vehicle passing part information sjAfter all the upstream ramps are searched, each upstream ramp R at the time of t is obtainediCorrespond toThe source traffic count of Fi t；
c 4: setting each of the upstream ramps RiThe corresponding passing traffic flow accounts for
Figure FDA00035695899300000210
Figure FDA00035695899300000211
Wherein: n is the number of the upstream ramps of the road section to be adjusted and is a positive integer.
2. The expressway traffic flow tracing and ramp regulating method combining historical data according to claim 1, wherein the expressway traffic flow tracing and ramp regulating method comprises the following steps: in step S2, the process of collecting the vehicle information of the vehicle passing through the monitoring point includes the steps of:
b 1: setting the statistical time period as k and the acquisition ending time as t moment;
then, the information of the vehicle to be analyzed passing through the vehicle of the road section to be adjusted between the time t-k and the time t is collected as follows:
Figure FDA00035695899300000212
b 2: setting all the upstream ramps of the road section to be adjusted to be RiWherein: n, n is the number of the upstream ramps of the road section to be adjusted and is a positive integer;
the upstream ramp RiThe corresponding vehicle passing data extraction starting and stopping time period is
Figure FDA00035695899300000213
Based on each of the upstream ramps RiUpper monitoring point, extracted at
Figure FDA00035695899300000214
Inner passage ramp RiRamp passing vehicle body part information setAre synthesized into
Figure FDA0003569589930000031
Wherein,
Figure FDA0003569589930000032
for vehicles from said up-ramp RiThe maximum travel time required for the upper monitoring point to travel to the congestion point of the road section to be adjusted;
Figure FDA0003569589930000033
the vehicle goes from the upstream ramp RiAnd the shortest travel time is required for the upper monitoring point to travel to the congestion point of the road section to be adjusted.
3. The expressway traffic flow tracing and ramp regulating method combining historical data according to claim 2, wherein the expressway traffic flow tracing and ramp regulating method comprises the following steps of: the maximum travel time
Figure FDA0003569589930000034
And said minimum travel time
Figure FDA0003569589930000035
The calculation method of (2) is as follows:
setting: the upstream ramp RiThe distance from the upper monitoring point to the congestion point of the road section to be adjusted is DISTiThe speed limit value of the road section to be adjusted is SPDmax；
Figure FDA0003569589930000036
Figure FDA0003569589930000037
Wherein,
Figure FDA0003569589930000038
for the above-mentioned upstream ramp RiDriving a vehicle in a form on a road section between congestion points of the road section to be adjusted by an upper monitoring point, and averaging the vehicle speed between the time t-k and the time t; alpha is a modified positive coefficient.
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