WO2020259301A1 - 交叉口车辆延误时间与停车次数的计算方法和装置 - Google Patents
交叉口车辆延误时间与停车次数的计算方法和装置 Download PDFInfo
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- WO2020259301A1 WO2020259301A1 PCT/CN2020/095557 CN2020095557W WO2020259301A1 WO 2020259301 A1 WO2020259301 A1 WO 2020259301A1 CN 2020095557 W CN2020095557 W CN 2020095557W WO 2020259301 A1 WO2020259301 A1 WO 2020259301A1
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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
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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
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/065—Traffic control systems for road vehicles by counting the vehicles in a section of the road or in a parking area, i.e. comparing incoming count with outgoing count
Definitions
- the invention relates to the technical field of traffic intelligent management, in particular to a method for calculating the number of vehicle delays and parking times at an intersection.
- Any new or modified signal control system needs to meet one or more specific goals. Sometimes these goals may be easy to express, such as reducing traffic congestion in the core area of the city, minimizing the number of stops, etc. However, sometimes it is not so easy to measure in detail.
- the purpose of traffic signal control evaluation is to make a scientific and reasonable evaluation of the actual operation effect of traffic signal control. Among them, delay is the most commonly used evaluation index in traffic signal control, and the number of stops is often used as a secondary index.
- the number of delays and parking times at signalized intersections is an evaluation index that reflects vehicle obstruction and travel time loss at signalized intersections, and can comprehensively reflect the advantages and disadvantages of the geometric design and signal timing of the intersection.
- Delays usually refer to the increase in travel time caused by factors beyond the driver's control such as road and environmental conditions, traffic interference, and traffic management and control facilities.
- the number of times a vehicle has stopped refers to the number of times the vehicle has stopped under the influence of signal control when passing through an intersection, that is, the degree of stopping of the vehicle when it is blocked.
- video traffic parameter detection It is mainly limited to the detection of general traffic parameters at intersections such as traffic flow, average speed, lane occupancy rate, and queue length, and then uses model calculations to indirectly obtain vehicle delays, the core evaluation indicators of intersection signal control.
- the existing video detection technology cannot directly detect the control delay of vehicles passing through the intersection.
- Video detection and target tracking technology are used to automatically obtain the control delay and other parameters of the signal control intersection, providing a method based on Video detection method for vehicle control delays at intersections.
- the video sensor is extremely susceptible to interference from the surrounding environment. For example, severe weather conditions such as strong light, rain, snow, and fog will affect the normal operation of the video sensor, resulting in inaccurate information detection results.
- the microwave detector has strong environmental adaptability, can run all-weather, and has the technical advantages of high precision, high reliability, large area detection, high economic efficiency, and easy installation. It satisfies the requirements of various aspects of traffic information collection. However, the use of microwave detection technology to detect the delay time and the number of stops at intersections is very rare.
- the purpose of the present invention is to provide a method for calculating the vehicle delay time and the number of parking at an intersection, which is used to solve the technical problem in the prior art that the accuracy of data detected by video detection and target tracking technology is greatly affected by the environment.
- the present invention proposes the following technical solutions:
- the calculation methods of vehicle delay time at intersections include:
- the vehicle speed delay threshold value is 3 km/h to 5 km/h.
- the present invention also provides a method for calculating the number of vehicle stops at an intersection, including:
- the aforementioned method for calculating vehicle delay time at an intersection is implemented based on a computing device for vehicle delay time at an intersection, so the calculation device includes:
- Microwave detector used to detect and collect the driving information of vehicles entering the intersection
- a processing module is provided in the microwave detector, and the processing module executes the following processing procedures:
- An output module is provided in the microwave detector, and the output module is used to output the processing result of the processing module.
- the foregoing method for calculating the number of stops at an intersection is implemented based on a calculation device for the number of stops at an intersection, so the calculation device includes:
- Microwave detector used to detect and collect the driving information of vehicles entering the intersection
- a processing module is provided in the microwave detector, and the processing module executes the following processing procedures:
- An output module is provided in the microwave detector, and the output module is used to output the processing result of the processing module.
- This scheme proposes a microwave-based method for calculating the number of vehicle delays and parking times at intersections.
- the microwave detector is used to directly detect the number of parking times and delay times in multiple lanes at any time at the intersection, and is not affected by the external environment , High accuracy, able to make an objective evaluation of the current traffic signal control effect, and also an objective basis for future system upgrades, control strategy adjustments and traffic signal timing plan optimization.
- FIG. 1 is a schematic diagram of the microwave coverage of an intersection area of a microwave detector in a specific embodiment of the present invention
- Figure 2 is a flow chart of calculating the delay time in a specific embodiment of the present invention.
- Fig. 3 is a flowchart for calculating the number of parking times in a specific embodiment of the present invention.
- the specific embodiment of the present invention is based on a microwave detector to detect and count several important traffic parameters at the intersection, mainly including traffic flow, delays and the number of stops.
- the core device in the present invention is a microwave detector, which is a device widely used in the field of traffic detection. It is usually equipped with a microwave transmitting module, a digital-to-analog conversion module, a calculation processing module, a storage module, an input and output module, etc., It is used to track and detect the position and speed of the vehicle, calculate according to the preset program, and output the result.
- the detection area of the microwave detector needs to be determined.
- the microwave detector is located in the middle of the road, and the two sides of the scanned fan-shaped area are symmetrical with respect to the X axis.
- the specific location of the microwave detector above is an example, and the implementer can adjust it according to the road conditions on site.
- the vehicle speed delay threshold needs to be set in the microwave detector.
- the range of the vehicle speed delay threshold is 3km/h-5km/h, and the optimal value is 5km/h.
- This parameter needs to be used in the program preset in the microwave detector as a criterion for judging whether the vehicle is delayed. When the vehicle speed is lower than this parameter, the vehicle is deemed to be delayed, and when the vehicle speed is higher than this parameter, the vehicle is deemed not to be delayed.
- start the microwave detector to detect and collect the driving information of vehicles entering the intersection, so as to realize the trajectory tracking detection of all vehicles in the detection area.
- the microwave detector continuously emits frequency-modulated microwave beams to detect vehicle information on the road.
- the microwave detector uses the reflected echo to determine the vehicle's position, speed and other information (specifically extracting the position, speed and other information from the echo signal belongs to the microwave in the prior art.
- the conventional detection technology can be referred to the prior art for details, which will not be repeated here).
- each vehicle is distinguished, identified and determined, and an identifier ID is set for each vehicle to achieve multi-target detection.
- the microwave detector collects information such as the position and speed that match the vehicle in real time according to the vehicle ID, and tracks the target by locating changes in the vehicle position in real time. Finally, the microwave detector performs cyclic detection on the detection area to realize the tracking and detection of all vehicles in the detection area. If the vehicle leaves the detection area, the vehicle ID information will be initialized, that is, the information corresponding to the ID will be cleared. This ID will be free and will be given to newly entered vehicles covered by the detection.
- Embodiment 1 Calculate the average delay time of all vehicles passing through the beam coverage in any time period.
- each car when performing statistics for the time unit of duration t i , within the coverage of the microwave detector beam, traverse each car in order from far to near or from near to far in accordance with the distance between the vehicle and the stop line Cars, judge each car in the following order:
- the duration of the above time unit can be selected as required.
- the minimum value of the time unit is determined according to the scanning period of the microwave detector. For example, the scanning period is 50 ms, and the duration of each time unit is 50 ms. At this time, the detection accuracy is the highest, but it will cause a large amount of calculation. If the time length of the time unit is larger, the detection accuracy is not high. Generally, it is preferable to choose t i ⁇ 3s, and the recommended optimal value is 1 second.
- the total delay time in the first second and the number of vehicles passing the lane stop line are counted according to the above method; then in the second and third seconds of the statistical period...
- the total delay time and the number of vehicles passing the lane stop line; finally, the total number of vehicles passing the lane stop line is used as the cycle total flow V flow , and the sum of all delay times is added as the cycle total delay time T d , and then calculated by the formula Average cycle delay time
- the microwave detector is used to detect and collect the driving information of vehicles entering the intersection.
- a processing module is provided in the microwave detector, and the processing module executes the following processing procedures:
- the statistical period is T, and divide the statistical period T into m continuously distributed time units.
- An output module is provided in the microwave detector, and the output module is used to output the processing result of the processing module.
- the third embodiment is to calculate the average number of stops for all vehicles passing through the beam coverage in any time period.
- each car when performing statistics for the time unit of duration t i , within the coverage of the microwave detector beam, traverse each car in order from far to near or from near to far in accordance with the distance between the vehicle and the stop line Cars, judge each car in the following order:
- the duration of the aforementioned time unit can be selected according to needs, and can be performed with reference to the selection method in the first embodiment.
- the preferred time unit is an integer number of seconds, such as 1 second.
- the statistical period is T (T ⁇ 1) (unit: s), and the total number of vehicles in the beam coverage area of the statistical period T is n (n ⁇ 1) (unit: vehicles), and the statistical period T is divided into time units After the division, statistics are made separately until all n vehicles are counted.
- the number of stops c i and the number of vehicles passing the lane stop line n i in the first second are counted according to the above method; then in the second and third seconds of the statistical period... Respectively count the corresponding number of parking times c i and the number of vehicles passing through the lane stop line n i ; finally, the total number of vehicles passing through the lane stop line is used as the cycle total flow V flow , and all the number of parking times c i is added as the cycle total number of parking times T s , and then use the formula to calculate the cycle average number of stops
- the fourth embodiment provides a device for calculating the number of stops at an intersection, including
- Microwave detector used to detect and collect the driving information of vehicles entering the intersection
- a processing module is provided in the microwave detector, and the processing module executes the following processing procedures:
- An output module is provided in the microwave detector, and the output module is used to output the processing result of the processing module.
- the vehicles can be managed by lanes as a unit according to the location information of the vehicles, and the number of parking times and delay times of vehicles in each lane can be analyzed and calculated.
- each lane is numbered, and the coordinate range of each lane on the Y axis is determined.
- the coordinate range of the first lane is Y0 ⁇ Lane1 ⁇ Y1
- the coordinate range of the second lane is Y1 ⁇ Lane2 ⁇ Y2
- the coordinate range of the third lane is Y2 ⁇ Lane3 ⁇ Y3, and so on.
- Another embodiment of the present invention discloses an electronic device, including a memory and a processor, the memory and the processor are communicatively connected to each other, for example, connected by a bus or other means, and computer instructions are stored in the memory, The processor executes the method for calculating the green light empty time at an intersection by executing the computer instruction.
- the processor is preferably but not limited to a central processing unit (CPU).
- the processor can also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), Application Specific Integrated Circuit (ASIC), Field Programmable Gate Array (Field Programmable Gate Array, FPGA) or other Chips such as programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, or a combination of the above types of chips.
- DSP Digital Signal Processor
- ASIC Application Specific Integrated Circuit
- FPGA Field Programmable Gate Array
- FPGA Field Programmable Gate Array
- the memory as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer executable programs and modules, as in the embodiment of the present invention corresponding to the method for calculating the green light empty time at an intersection
- the processor executes various functional applications and data processing of the processor by running the non-transitory software programs, instructions and modules stored in the memory, that is, to realize a kind of intersection green light in the above method embodiment Empty time calculation method.
- the memory may include a program storage area and a data storage area.
- the program storage area may store an operating system and an application program required by at least one function; the data storage area may store data created by the processor and the like.
- the memory is preferably but not limited to a high-speed random access memory.
- it may also be a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid state storage devices.
- the memory may also optionally include a memory remotely arranged with respect to the processor, and these remote memories may be connected to the processor through a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.
- storage media can be magnetic disks, optical disks, read-only memory (Read-Only Memory, ROM), random access memory (RAM), flash memory (Flash Memory), hard disk (HardDisk Drive, Abbreviation: HDD) or Solid-State Drive (SSD), etc.; the storage medium may also include a combination of the above types of memories.
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Abstract
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Claims (10)
- 根据权利要求1所述的交叉口车辆延误时间的计算方法,其特征在于:当周期总流量V 流=0时,周期总延误时间T d=0,周期平均延误时间T′ d=0。
- 根据权利要求1所述的交叉口车辆延误时间的计算方法,其特征在于:针对时长为t i的时间单元进行统计时,在微波检测器波束覆盖范围内,根据车辆与停止线之间的距离,按照由远及近或由近及远地顺序遍历每一辆车,对每一辆车进行如下顺序判断:S1、判断车速是否不高于车速延误阈值且未驶过车道停止线,若满足,则该车辆在该时间单元内的延误时间为t i,在该时间单元内的延误时间总和T di增加t i,否则,该车辆在该时间单元内的延误时间为0,在该时间单元内的延误时间总和T di不变;S2、检测该车辆是否在该时间单元内驶过停止线,若驶过,则该时间单元内驶过车道停止线的车辆数增加1,否则,该时间单元内驶过车道停止线的车辆数不变。
- 根据权利要求1至3中任意一项所述的交叉口车辆延误时间的计算方法,其特征在于:所述车速延误阈值取值3km/h~5km/h。
- 根据权利要求1所述的交叉口车辆停车次数的计算方法,其特征在于:针对时长为t i的时间单元进行统计时,在微波检测器波束覆盖范围内,按照车辆与停止线之间的距离远近,由远及近或由近及远地顺序遍历每一辆车,对每一辆车进行如下判断:S1、判断车辆在未驶过车道停止线之前车速是否减为0,若满足,则该车辆在该时间单元内的停车次数为1,在该时间单元内的停车次数c i增加1,否则,该车辆在该时间单元内的停车次数为0,在该时间单元内的停车次数c i不变;S2、检测该车辆是否在该时间单元内驶过停止线,若驶过,则该时间单元内驶过车道停止线的车辆数增加1,否则,该时间单元内驶过车道停止线的车辆数不变。
- 交叉口车辆延误时间的计算装置,其特征在于:包括微波检测器,用于对进入交叉口的车辆行驶信息进行检测并收集;所述微波检测器内设置有处理模块,所述处理模块执行以下处理过程:设统计周期为T,初始化周期总流量V 流=0,初始化周期总延误时间T d=0;将统计周期T划分成m个连续分布的时间单元,每个时间单元的时长为t i(i=1,2,3,...m),针对时长为t i的时间单元,2)、统计驶过车道停止线的车辆总数n i(i=1,2,3......m);所述微波检测器内设置有输出模块,所述输出模块用于将处理模块的处理结果输出。
- 交叉口停车次数的计算装置,其特征在于:包括微波检测器,用于对进入交叉口的车辆行驶信息进行检测并收集;所述微波检测器内设置有处理模块,所述处理模块执行以下处理过程:初始化周期总流量V 流=0,初始化周期总停车次数T s=0;设统计周期为T,将统计周期T划分成m个连续分布的时间单元,每个时间单元的时长为t i(i=1,2,3,...m),针对时长为t i的时间单元,1)、统计驶过车道停止线之前车速减为0的次数c i(i=1,2,3......m);2)、统计驶过车道停止线的车辆总数n i(i=1,2,3......m);所述微波检测器内设置有输出模块,所述输出模块用于将处理模块的处理结果输出。
- 一种电子设备,其特征在于,包括存储器和处理器,所述存储器和所述处理器之间互相通信连接,所述存储器中存储有计算机指令,所述处理器通过执行所述计算机指令,从而执行权利要求1-4任一项所述的交叉口车辆延误时间的计算方法以及权利要求5-6任一项所述的交叉口车辆停车次数的计算方法。
- 一种计算机可读存储介质,其特征在于,所述计算机可读存储介质存储有计算机指令,所述计算机指令用于使所述计算机执行权利要求1-4任一项所述的交叉口车辆延误时间的计算方法以及权利要求5-6任一项所述的交叉口车辆停车次数的计算方法。
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CN111741267B (zh) * | 2020-06-24 | 2022-03-08 | 浙江大华技术股份有限公司 | 一种车辆延误的确定方法、装置、设备及介质 |
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