WO2013075373A1 - Procédé et dispositif de détermination de trafic de saturation - Google Patents

Procédé et dispositif de détermination de trafic de saturation Download PDF

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Publication number
WO2013075373A1
WO2013075373A1 PCT/CN2011/084184 CN2011084184W WO2013075373A1 WO 2013075373 A1 WO2013075373 A1 WO 2013075373A1 CN 2011084184 W CN2011084184 W CN 2011084184W WO 2013075373 A1 WO2013075373 A1 WO 2013075373A1
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WIPO (PCT)
Prior art keywords
saturated
head
time
headway
value
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PCT/CN2011/084184
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English (en)
Chinese (zh)
Inventor
李瑾
朱中
李月高
陈晓明
王志明
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青岛海信网络科技股份有限公司
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Publication of WO2013075373A1 publication Critical patent/WO2013075373A1/fr

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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
    • G08G1/0108—Measuring and analyzing of parameters relative to traffic conditions based on the source of data
    • G08G1/0116—Measuring and analyzing of parameters relative to traffic conditions based on the source of data from roadside infrastructure, e.g. beacons
    • 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
    • G08G1/0133—Traffic data processing for classifying traffic situation

Definitions

  • the present invention relates to the field of intelligent transportation, and in particular, to a method and apparatus for determining a saturated flow rate. Background technique
  • the saturation flow value is an important parameter for the timing design and capacity study of the signal intersection. It refers to the maximum traffic flow value that can pass during the green light signal time when there is a long queue of vehicles waiting at the entrance of the signal intersection. Represented by the number of vehicles passing through the effective green time per hour.
  • the saturation flow value is constant under certain road conditions and vehicle conditions. However, in actual conditions, road conditions and vehicle conditions are not the same, so the saturation flow values are not the same. There are many factors affecting the saturation flow value, except for the relative traffic flow, lane position and width, traffic composition, the proportion of turning vehicles in the mixed driving lane, and the slope of the inlet road, which have significant effects on the saturation flow value.
  • the saturation flow value is obtained by using the field observation method. A large number of personnel are observed to observe the intersection on site, record the relevant parameters, and then process the observation data to obtain the saturated flow value. The automatic calculation of the saturated flow value has not yet been achieved. Program. Summary of the invention
  • Embodiments of the present invention provide a method and apparatus for determining a saturated flow rate, which are used to implement an automatic measurement scheme for a saturated flow rate value.
  • a method for determining a saturated flow rate comprising:
  • the headway distance represents a time when the vehicle exists at the inlet lane and a previous moment when the vehicle exists at the inlet lane Time difference
  • the saturation flow value is determined according to the statistically obtained headway time interval, and the saturated flow rate value is the maximum traffic flow value that can be passed during the green light signal time when there is a vehicle waiting in the entrance lane.
  • a device for determining a saturated flow rate comprising:
  • a collection statistics module configured to collect pulse data of a detector output at an entrance lane of a signalized intersection; the detector is configured to detect in real time whether a vehicle exists at the inlet lane, and the pulse data is used for Indicates test results Data; according to the pulse data collected by the enthalpy, the headway distance at the inlet lane is counted; the headway time interval indicates the moment when the vehicle exists at the inlet lane and the previous one of the vehicles at the inlet lane Time difference between times;
  • the saturation flow determining module is configured to determine a saturated flow value according to the statistically obtained headway time interval, wherein the saturated flow rate value is a maximum traffic flow value that can pass through the green light signal time when there is a vehicle waiting at the inlet lane.
  • the pulse data of the detector output at the entrance of the signal intersection is set; the time interval of the head at the entrance channel is counted according to the pulse data collected by the ;; the time interval of the head is determined according to the statistics Saturated flow value, it can be seen that the present invention realizes an automatic measurement scheme of the saturated flow value.
  • FIG. 1 is a schematic flowchart of a method according to an embodiment of the present disclosure
  • 2A is a schematic flow chart of calculating a vehicle head time interval according to an embodiment of the present invention.
  • 2B is a schematic view showing a detector placed at an entrance duct according to an embodiment of the present invention
  • 2C is a schematic structural diagram of a device in an embodiment of the present invention.
  • 2D is a schematic diagram of a data measurement module in an embodiment of the present invention.
  • 2E is a schematic flowchart of measuring a saturated flow rate according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a device according to an embodiment of the present invention.
  • the embodiment of the present invention provides a method for determining a saturated flow rate.
  • the head time interval is calculated according to pulse data output by a detector disposed at an entrance of a signalized intersection, and The saturation flow value is determined based on the statistically obtained headway time.
  • the detector used in the present invention may be any detector capable of detecting the presence of an object.
  • a method for determining a saturated flow rate includes the following steps.
  • Step 10 collecting pulse data of a detector output at an entrance path of the signalized intersection; the detector is configured to detect in real time whether a vehicle exists at the entrance lane, and the pulse data is data for indicating a detection result; According to the pulse data collected by the , the headway distance at the entrance lane is counted; the headway distance represents the time difference between the moment when the vehicle exists at the entrance lane and the last moment when the vehicle exists at the entrance lane; The first time when there is a vehicle at the entrance lane, the corresponding headway time interval can be zero.
  • Step 11 Determine the saturation flow value based on the statistically obtained headway distance.
  • the saturated flow value is the maximum traffic flow value that can pass during the green light signal time when there is a vehicle waiting in the entrance lane.
  • step 10 can be as follows:
  • A set the value of the counter to 0;
  • B A pulse time length pulse data output by the detector;
  • step C Determine whether there is a vehicle at the entrance time according to the pulse data of the current set, and if so, store the time interval corresponding to the current time, and the stored time of the front head is the value of the current counter and a pulse time.
  • step 10 is not limited to the above manner, and any scheme capable of counting the headway interval based on the pulse data output by the detector is within the protection scope of the present invention.
  • the pulse data output by the detector can be collected within a set time length, for example, the pulse data output by the detector within 24 hours of the collection.
  • the collection frequency can be a pulse length of time, such as 20 milliseconds.
  • step 11 The specific implementation of step 11 can be as follows:
  • the head time interval in the preset time interval of the saturated head is selected from the statistically obtained head time interval; the saturated head time interval is composed of a plurality of saturated head time subranges; for example, the saturation
  • the time interval of the front is divided into N equal parts, then each aliquot is a saturated headway sub-interval; the unit of the headway is the unit representing the time, the time interval of the saturated front, and the sub-interval of the saturated head.
  • the unit of the upper limit value and the lower limit value is also a unit indicating time.
  • the unit of the headway time is seconds, and the unit that constitutes the saturated headway interval interval and the upper head limit and the lower limit value of the saturated headway time interval may also be seconds.
  • the value can be an arithmetic mean or a weighted average.
  • P saturated heads are selected from a plurality of saturated head time sub-intervals;
  • P is a positive integer not greater than the total number of sub-intervals of the saturated head;
  • the average value may be an arithmetic mean value or a weighted average value Wait;
  • the saturation flow value is determined based on the determined saturation headway time interval.
  • the saturated flow value saturated headway distance /V
  • the value of V is determined according to the unit of the headway time interval. When the unit of the headway is in seconds, the value of V is 3600, and the unit of the time at the head is minute. In the case of V, the value of V is 60, and when the unit of the headway is hour, the value of V is 1.
  • P saturated head positions are selected from a plurality of saturated head time sub-intervals, and the specific implementation can be as follows:
  • a maximum sum value may be randomly selected, and then P saturated head-to-head sub-intervals corresponding to the finally selected maximum sum value are selected.
  • P is a positive integer not greater than the total number of sub-intervals at the time of saturation of the head.
  • the value of P needs to ensure that the calculated number of totals is greater than a certain threshold. For example, the threshold is 1.
  • the new headway time interval in the interval between the saturation heads is counted, according to the new headway time interval, when the head position in the sub-interval is located at the time of the saturated head of the new headway.
  • the number of distances and the average of the headway distances in the sub-intervals of the saturated heads at the time of the new head are updated.
  • the number of headway distances in the sub-interval from the saturated head in the new head is originally n
  • the time of the head in the sub-interval at the time of the saturated head of the new head is The average value is that the new headway is ⁇ "+ ⁇ , then the number of updated headways is ⁇ +1, and the average of the updated headway distance - nx 3 ⁇ 4 +' x a ⁇ i
  • the saturation headway interval interval can be (1.0, 5.0), and the saturated headway interval interval is composed of the following 40 saturated headway time interval subranges: (1.0,1.1], (1.1,1.2], (1.2,1.3 ], (1.3,1.4], (1.4,1.5], (1.5,1.6], (1.6,1.7], (1.7,1.8], (1.8,1.9], (1.9,2.0], (2.0, 2.1], (2.1, 2.2], (2.2,2.3], (2.3,2.4], (2.4,2.5], (2.5,2.6], (2.6,2.7], (2.7,2.8], (2.8,2.9], (2.9 , 3.0], (3.0, 3.1], (3.1, 3.2], (3.2, 3.3], (3.3, 3.4], (3.4, 3.5], (3.5, 3.6], (3.6, 3.7), (3.7, 3.8 ], (3.8, 3.9], (3.9, 4.0], (4.0, 4.1], (4.1, 4.2], (4.2,4.3), (4.3,4.4], (4.4,4.5], (4.5,4.6], (4.6, 4.7], (4.7, 4.8], (4.8,
  • the apparatus used in this embodiment includes a detector and a saturation flow determining device, wherein:
  • the detector is placed at the entrance of the signalized intersection 30 meters from the stop line, as shown in Figure 2B. Saturated flow rate The position of the device can be set arbitrarily.
  • the detector detects in real time whether or not there is a vehicle at the entrance lane and outputs pulse data indicating the detection result.
  • the saturation flow determining device collects the pulse data outputted by the detector, counts the headway distance at the inlet track based on the pulse data collected by the enthalpy, and determines the saturated flow value according to the statistically obtained headway time interval. Determining a frequency saturation pulse flow data collector means preclude the detector output may be 20 ms / views, the set data for accuracy preclude 10-2.
  • the architecture of the saturation flow determining device is shown in Figure 2C.
  • the device uses an advanced system architecture, the CPU is ATMEL9260, and the operating system is embedded Linux.
  • Memory management is mainly implemented by the embedded Linux Memory Management Unit (MMU).
  • MMU embedded Linux Memory Management Unit
  • the determined saturation flow value and the like are stored in the internal memory (NAND FLASH) in a file format, and the data is not lost within 10 years after the power is turned off.
  • the external communication interface of the saturation flow determining device has a serial port (RS232), a network port, etc., and the device can be restarted by a watchdog or the like.
  • the saturation flow determining device includes a physical layer, a system layer, an intermediate layer, and an application layer in order from bottom to top; an embedded Linux operating system runs in the system layer; the middle layer includes a serial port driver, a network port driver, and a universal serial bus.
  • USB Universal Serial Bus
  • SD Secure Digital
  • GPIO General Purpose Input Output
  • Real Time Chip Real Time Chip
  • the application layer includes a data measurement module, a program upgrade module, a timer module, a data storage module, a communication processing module, and a running log module, where:
  • the processing flow of the data calculation module is: collecting the pulse data output by the detector, counting the time interval of the headway at the entrance track according to the pulse data collected by the ,, and determining the saturation flow according to the statistically obtained headway time interval. value.
  • the data measurement module can also provide the determined saturation flow value to the data storage module and the communication processing module.
  • the data storage module stores the saturated flow value.
  • the communication processing module can output the saturated flow value stored by the data storage module.
  • the timer module is used to control the data calculation module to collect the pulse data output by the detector according to a certain frequency.
  • Program The upgrade module is used to implement the upgrade function of the program installed at the application layer.
  • the running log module is used to record the log information of the application layer, and the communication processing module can also output the log information for manually analyzing the running state of the device.
  • Step 1 Set the pulse data output from the detector at the entrance of the signal intersection, and calculate the headway distance at the entrance path based on the pulse data collected by the signal, which is recorded as the unit in seconds and i is the vehicle count.
  • Step 2 The time interval of the head in the time interval of the preset saturated head is selected from the calculated time intervals of each of the heads;
  • the pre-set minimum headway interval is (0,1.0)
  • the saturated headway interval is: (1.0,1.1], (1.1,1.2], (1.2,1.3], ..., (4.8, 4.9] , (4.9,5.0]
  • the interval between unsaturated heads is: (5.0 + ⁇ );
  • the interval of (0,1.0) belongs to the minimum front time interval, and there is almost no data in the actual detection, which is negligible.
  • the interval of (5.0, + ⁇ ) belongs to the unsaturated headway time interval, and the data required by this method is the saturated front head. Time interval, so the (5.0, + ⁇ ) interval is also ignored.
  • Step 3 Determine and record the number n of the headway distances in the sub-interval of the saturated head, and the sub-intervals in the saturated headway time interval for each saturated headway time interval that constitutes the saturated headway time interval interval.
  • the average of the distances is: ⁇ ⁇ ;
  • 3 ⁇ 4a ⁇ 1 ⁇ n' + i ';
  • Step 4 Calculate the sum of the n values corresponding to the subintervals of the 10 consecutive saturated heads from the sub-interval of the saturated head, for each of the saturated heads in the 40 saturated heads. Value, select the 10 saturated head-to-head interval corresponding to the largest sum value; that is, calculate the 1-10th saturated headway time interval The sum value N1 of the corresponding n value, the sum value N2 of the n value corresponding to the subinterval of the 2-11th saturated headway, and the sum value N3 of the n value corresponding to the subinterval of the 3-12th saturated headway, according to In this way, until the 31-40th saturated head is calculated, the sum value N31 corresponding to the sub-interval is calculated, and then 10 saturated heads corresponding to the maximum values of N1, N2, N3, ..., N31 are selected. Time interval subinterval;
  • Step 5 Calculate all the average values corresponding to the sub-intervals of the selected 10 saturated heads to get the saturated car ii ⁇
  • the saturation flow determining device provided in this embodiment can count the headway distance data of all vehicles; without manual observation, the device can automatically calculate the saturated flow value. At the same time, the saturated flow value obtained by manual observation is obtained based on the data recorded during the manual observation, and the device can recalculate the saturated flow value as the headway distance data increases.
  • the device can store historical data and can communicate data through serial port or network port.
  • an embodiment of the present invention further provides a device for determining a saturated flow rate, where the device includes:
  • the statistic module 30 is configured to collect pulse data of a detector output at an entrance path of the signalized intersection; the detector is configured to detect whether a vehicle exists at the inlet lane in real time, and the pulse data is used Data indicating the detection result; counting the headway distance at the inlet lane based on the pulse data collected by the enthalpy; the vehicle head time interval indicating the presence of the vehicle at the inlet lane and the presence at the inlet lane The time difference between the last moments of the vehicle;
  • the saturation flow determining module 31 is configured to determine a saturated flow value according to a statistically obtained headway time interval, where the saturated flow value is a maximum traffic flow value that can pass during a green light signal time when a vehicle is waiting in line at the inlet lane. .
  • the collection statistics module 30 is configured to: perform the following steps A-step C:
  • A set the value of the counter to 0;
  • step C determining, according to the pulse data of the set, whether there is a vehicle at the entrance time at the current time, and if present, storing a time interval corresponding to the current time of the head, and storing the value of the front time of the head is the value of the current counter and a value The product of the length of the pulse time, and returns to step A; if not, the value of the counter is incremented by 1, and the process returns to step B.
  • the saturation flow determination module 31 is configured to:
  • the time interval of the head in the pre-set saturated headway time interval is selected from the statistically obtained headway time interval;
  • the saturated headway time interval interval is composed of a plurality of saturated headway time interval subintervals;
  • P saturated heads are selected from the plurality of saturated head time subintervals; P is a positive integer not greater than the total number of sub-intervals of the saturated head;
  • a saturation flow value is determined based on the saturated headway time interval.
  • the saturation flow determination module 31 is configured to:
  • the saturation flow determining module 31 is further configured to:
  • the collected statistics module When the collected statistics module counts a new headway distance in the time interval of the saturated headway, according to the new headway time interval, it is located in the saturated headway time interval of the new headway time interval. The number of head-to-head distances and the average of the head-to-head distances in the sub-sections of the saturated heads at the time of the new head are updated.
  • the device further includes: a data storage module 32 and/or a communication processing module 33;
  • the data storage module 32 is configured to store a saturated flow value determined by the saturation flow determining module; the communication processing module 33 is configured to output the saturated flow value determined by the saturated flow determining module.
  • the operating system running on the device is an embedded Linux system.
  • the beneficial effects of the present invention include:
  • the pulse data outputted by the detector at the entrance of the signal intersection is collected; the time interval of the head at the entrance channel is counted according to the pulse data collected by the ;; The headway time interval determines the saturation flow value, and it can be seen that the present invention realizes an automatic measurement scheme of the saturation flow value.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the device is implemented in a flow or a flow or a block diagram of a block or multiple The function specified in the box.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Abstract

L'invention concerne un procédé et un dispositif de détermination de trafic de saturation, concernant le domaine du transport intelligent et utilisés pour effectuer la mesure et le calcul automatiques de valeurs de trafic de saturation. Le procédé comprend : la collecte de données impulsionnelles délivrées par un détecteur prévu à l'approche d'un croisement à feux ; le comptage de l'intervalle de temps à l'approche conformément aux données impulsionnelles collectées ; et la détermination d'une valeur de trafic de saturation conformément à l'intervalle de temps compté.
PCT/CN2011/084184 2011-11-21 2011-12-19 Procédé et dispositif de détermination de trafic de saturation WO2013075373A1 (fr)

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CN 201110371621 CN102509456B (zh) 2011-11-21 2011-11-21 饱和流量确定方法和装置
CN201110371621.7 2011-11-21

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CN109389826B (zh) * 2018-12-14 2021-03-16 武汉理工大学 一种信号交叉口饱和流率的实时计算方法
CN110379169B (zh) * 2019-03-21 2021-08-17 江苏智通交通科技有限公司 基于视频号牌设备的待转区车道饱和车头时距计算方法
WO2020248197A1 (fr) * 2019-06-13 2020-12-17 Beijing Didi Infinity Technology And Development Co., Ltd. Estimation de flux de saturation pour intersections signalisées à l'aide de données de trajectoire de véhicule
CN111028509B (zh) * 2019-12-19 2020-12-15 河北万方中天科技有限公司 交通饱和流量获取方法、装置及终端设备
CN111815973B (zh) * 2020-06-30 2022-12-16 平安国际智慧城市科技股份有限公司 信号交叉口分析方法及相关设备
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