CN113963559A - Vehicle-road cooperative roadside device information publishing method based on event importance - Google Patents

Vehicle-road cooperative roadside device information publishing method based on event importance Download PDF

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Publication number
CN113963559A
CN113963559A CN202111216701.5A CN202111216701A CN113963559A CN 113963559 A CN113963559 A CN 113963559A CN 202111216701 A CN202111216701 A CN 202111216701A CN 113963559 A CN113963559 A CN 113963559A
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information
road
event
road section
importance
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文娟
张纪升
孙晓亮
刘见平
张利
张凡
崔玮
李骁一
李建立
赵丽
王�华
欧阳海
王体彬
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Beijing Zhongjiao Guotong Intelligent Traffic System Technology Co ltd
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Beijing Zhongjiao Guotong Intelligent Traffic System Technology Co ltd
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
    • G08G1/096783—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is a roadside individual element
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • 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

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Abstract

The vehicle-road cooperative roadside device information publishing method based on the event importance can obtain more accurate data modification processing, can better reflect the change trend of traffic flow, can greatly reduce the abnormal data proportion, and can be used for predicting the traffic flow model of the road network in daily and major holidays. The method comprises the following steps: (1 objective function fjThe information quantity of the jth road section is formula (1); (2) the attenuation factor is determined in dependence on the distance from the road-side device to the information-generating road section, by eijRepresenting real-time attenuation factors of the j road section information on the i road section; (3) establishing a mathematical programming model as a formula (3); (4) dividing the information content into general information, prompt information, suggestion information, mandatory information, burst or emergency information according to the importance and emergency of the information, quantizing the importance of the information, and respectivelySetting as follows: 0.2, 0.4, 0.8 and 1.0; and when a plurality of pieces of information need to be displayed on the same screen at the same time, selecting or rejecting according to the height of the importance coefficient.

Description

Vehicle-road cooperative roadside device information publishing method based on event importance
Technical Field
The invention belongs to the technical field of intelligent transportation, and particularly relates to a vehicle-road cooperative roadside device information publishing method based on event importance.
Background
At present, the information publishing mode on the highway is mainly an information board, and the information board has fixed positions, limited quantity and poor timeliness of information publishing, so that integrated publishing and hierarchical control cannot be realized. Meanwhile, most of the current domestic information boards are text information such as propaganda and the like, only shunt under the event condition is concerned, delay is reduced, information such as speed limit, lane closing reminding and the like which are urgently needed by a driver is not published in time, service cannot be provided for travelers, and the service efficiency of the current information publishing system is greatly reduced. According to the invention, a roadside control strategy is generated by using a vehicle-road cooperative information publishing mode of roadside equipment through a roadside equipment edge computing system, and online distribution of roadside traffic control strategy information is realized.
Aiming at the problem that the existing information publishing mainly judges the importance of information manually according to information types such as weather, traffic accidents, construction and the like, the invention provides a road side terminal multilevel information publishing method based on event importance attenuation, which introduces attenuation factors, establishes a road section information function F and sets a grading threshold of an F value.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method can obtain more accurate data modification processing, can better reflect the change trend of traffic flow, can greatly reduce abnormal data proportion, and can be used for predicting traffic flow models of daily and major holidays of a road network.
The technical solution of the invention is as follows: the information release method of the vehicle-road cooperative roadside device based on the event importance degree comprises the following steps:
(1) suppose the length of the j-th road segment is ljThe traffic volume is vjRoad surface condition coefficient of alphajProbability coefficient of the disastrous weather is betajAn objective function fjThe information content of the jth road section is formula (1)
fj＝lj·vj·αj·βj (1)；
(2) The attenuation factor is determined in dependence on the distance from the road-side device to the information-generating road section, by eijReal-time attenuation factor of j road section information in i road section
Vij＝eijvi·fj (2)；
(3) Establishing mathematical programming model as formula (3)
Figure BDA0003311029650000021
Xij: 0,1 variable, the link i is 1 when displaying the information of the link j, otherwise 0
W: the countermeasure level of the event section is 1 for the shutdown type countermeasures and 0.5 for the limitation type countermeasures
L: distance between event occurrence position and roadside apparatus
k: attenuation coefficient is-0.035
t: assume a distance event occurs at a time t
Figure BDA0003311029650000022
The average running speed of the vehicle on the road section where the road side equipment is located is
Figure BDA0003311029650000023
(4) According to the importance degree and the emergency degree of the information, the information content is divided into general information, prompting information, suggestion information, mandatory information, burst information or emergency information, the importance degrees of the information are quantized and respectively set as follows: 0.2, 0.4, 0.8 and 1.0; and when a plurality of pieces of information need to be displayed on the same screen at the same time, selecting or rejecting according to the height of the importance coefficient.
The invention adopts an event attenuation model, introduces attenuation factors, improves the real-time performance of information distribution, simultaneously provides a multi-level information distribution mode, gradually decreases along with the increase of the distance according to the importance degree of the event, fuses data information such as meteorological environment, road surface condition, traffic volume and the like of a road section to obtain a road section information quantity F, and accurately judges the level of the transmitted information according to the threshold value of the F, thereby obtaining more accurate data modification processing, better reflecting the change trend of traffic flow, greatly reducing abnormal data proportion and being used for the traffic flow model prediction of the daily and major holidays of a road network.
Drawings
FIG. 1 is a flowchart illustrating an implementation of a method for distributing information of a vehicle-road cooperative roadside device based on event importance according to the present invention;
FIG. 2 is a graph of attenuation factor versus distance for the present invention;
FIG. 3 is a raw data table of road segments in accordance with the present invention;
FIG. 4 is a road segment attenuation factor table of the present invention;
fig. 5 is a diagram of a multi-stage information distribution pattern of the roadside apparatus of the present invention.
Detailed Description
As shown in fig. 1, the information distribution method for vehicle-road cooperative roadside equipment based on event importance includes the following steps:
(1) suppose the length of the j-th road segment is ljThe traffic volume is vjRoad surface condition coefficient of alphajProbability coefficient of the disastrous weather is betajAn objective function fjThe information content of the jth road section is formula (1)
fj＝lj·vj·αj·βj (1)；
(2) The attenuation factor is determined in dependence on the distance from the road-side device to the information-generating road section, by eijReal-time attenuation factor of j road section information in i road section
Vij＝eijvi·fj (2)；
(3) Establishing mathematical programming model as formula (3)
Figure BDA0003311029650000041
Xij: 0,1 variable, the link i is 1 when displaying the information of the link j, otherwise 0
W: the countermeasure level of the event section is 1 for the shutdown type countermeasures and 0.5 for the limitation type countermeasures
L: distance between event occurrence position and roadside apparatus
k: attenuation coefficient is-0.035
t: assume a distance event occurs at a time t
Figure BDA0003311029650000042
The average running speed of the vehicle on the road section where the road side equipment is located is
Figure BDA0003311029650000043
(4) According to the importance degree and the emergency degree of the information, the information content is divided into general information, prompting information, suggestion information, mandatory information, burst information or emergency information, the importance degrees of the information are quantized and respectively set as follows: 0.2, 0.4, 0.8 and 1.0; and when a plurality of pieces of information need to be displayed on the same screen at the same time, selecting or rejecting according to the height of the importance coefficient.
The invention adopts an event attenuation model, introduces attenuation factors, improves the real-time performance of information distribution, simultaneously provides a multi-level information distribution mode, gradually decreases along with the increase of the distance according to the importance degree of the event, fuses data information such as meteorological environment, road surface condition, traffic volume and the like of a road section to obtain a road section information quantity F, and accurately judges the level of the transmitted information according to the threshold value of the F, thereby obtaining more accurate data modification processing, better reflecting the change trend of traffic flow, greatly reducing abnormal data proportion and being used for the traffic flow model prediction of the daily and major holidays of a road network.
Preferably, in the step (4),
f is less than or equal to 0.2, the position of the event is far away from the VMS, the importance degree of the information is very low, even the importance degree of the information is not as high as that of the general information, and therefore the information is not released;
Figure BDA0003311029650000051
when the information is important, the information is at least more important than the general information, and prompt information is issued;
Figure BDA0003311029650000052
in contrast, the event is considered to be located closer to the roadside apparatus, and the formal environment of the vehicle on the road section can be affected, so that the event is distributedAdvice information;
Figure BDA0003311029650000053
when the event is close to the road section, the event belongs to the adjacent road section of the event, and forced information should be issued;
Figure BDA0003311029650000054
when it is determined that the event location distance is close to the link, the mandatory information is issued.
The present invention is described in more detail below.
As shown in fig. 1, is a flow chart of the method of the present example:
step 1: each road section has different characteristics such as length, road conditions, accident rate, traffic volume, etc., and thus the frequency of accidents and congestion is also different. Let us assume that the length of the j-th road segment is ljThe traffic volume is vjRoad surface condition coefficient of alphajProbability coefficient of the disastrous weather is betajAn objective function fjInformation volume of jth link
fj＝lj·vj·αj·βj
Step 2: the effectiveness of the information is different because the distance between the roadside equipment and the accident occurrence point is different. Traffic information on a road segment farther from the accident site may have changed in traffic conditions when the traffic stream arrives at the site. The longer this distance is from the distribution of information to the arrival of the traffic flow at the traffic information occurrence point, the greater the possibility that the information will change. The information at a greater distance is less valuable to the driver and in order to characterize this feature, a dampening factor is introduced. e.g. of the typeijAnd representing the real-time attenuation factor of the j section information in the i section.
The attenuation factor is determined depending on the distance from the roadside device to the information generation section, and may be generally used
Figure BDA0003311029650000055
Vij＝eijvi·fj
And step 3: roadside devices publish information in the hope that as many drivers as possible see it. The following mathematical programming model is therefore established here:
Figure BDA0003311029650000061
Figure BDA0003311029650000062
Xijthe variable 0,1, the link i is 1 when displaying the information of the link j, otherwise is 0.
W is the countermeasure level of the event section, the shutdown countermeasure is 1, and the limit countermeasure is 0.5.
L is the distance between the position of the event and the road side equipment.
The k-attenuation coefficient was taken to be-0.035.
t-assuming a time t from the occurrence of the event,
Figure BDA0003311029650000063
-the average vehicle speed of the road section where the road side equipment is located is
Figure BDA0003311029650000064
And 4, step 4: according to the multi-level information distribution mode shown in fig. 5, different ranges need to distribute different types of information. And the determination of the release range needs the quantized index to judge, the text divides the information content into general information, prompt information, suggestion information, mandatory information, burst or emergency information according to the importance degree and the emergency degree of the information, and now quantizes the importance degree of the information, and respectively sets as: 0.2, 0.4, 0.8 and 1.0. And when a plurality of pieces of information need to be displayed on the same screen at the same time, selecting or rejecting according to the height of the importance coefficient.
F is less than or equal to 0.2, the position of the event is far away from the VMS, the importance degree of the information is very low, even the importance degree of the information is not as high as that of the general information, and therefore the information is not released;
Figure BDA0003311029650000065
when the information is important, the information is at least more important than the general information, and prompt information is issued;
Figure BDA0003311029650000066
when the vehicle is in a road, the position of the event is considered to be close to the road side equipment, and the form environment of the vehicle on the road can be influenced, so that the recommendation information is issued;
Figure BDA0003311029650000067
if the position of the event is close to the road section, the event belongs to the adjacent road section of the event, and forced information should be issued;
Figure BDA0003311029650000068
when it is determined that the event location distance is close to the link, the mandatory information is issued.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiment according to the technical spirit of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims (2)

1. The vehicle-road cooperative roadside device information publishing method based on the event importance degree is characterized by comprising the following steps: the method comprises the following steps:
(1) suppose the length of the j-th road segment is ljThe traffic volume is vjRoad surface condition coefficient of alphajProbability coefficient of the disastrous weather is betajAn objective function fjThe information content of the jth road section is formula (1)
fj＝lj·vj·αj·βj (1)；
(2) The attenuation factor is determined in dependence on the distance from the road-side device to the information-generating road section, by eijReal-time attenuation factor of j road section information in i road section
Vij＝eijvi·fj (2)；
(3) Establishing mathematical programming model as formula (3)
Figure FDA0003311029640000011
Figure FDA0003311029640000012
xij: 0,1 variable, the link i is 1 when displaying the information of the link j, otherwise 0
W: the countermeasure level of the event section is 1 for the shutdown type countermeasures and 0.5 for the limitation type countermeasures
L: distance between event occurrence position and roadside apparatus
k: attenuation coefficient is-0.035
t: assume a distance event occurs at a time t
Figure FDA0003311029640000013
The average running speed of the vehicle on the road section where the slightly side equipment is located is
Figure FDA0003311029640000014
(4) According to the importance degree and the emergency degree of the information, the information content is divided into general information, prompting information, suggestion information, mandatory information, burst information or emergency information, the importance degrees of the information are quantized and respectively set as follows: 0.2, 0.4, 0.8 and 1.0; and when a plurality of pieces of information need to be displayed on the same screen at the same time, selecting or rejecting according to the height of the importance coefficient.
2. The information distribution method for the vehicle-road cooperative roadside device based on the event importance degree according to claim 1, characterized in that: in the step (4), the step of (C),
f is less than or equal to 0.2, the position of the event is far away from the VMS, the importance degree of the information is very low and even not as high as that of the general information, so that the event is not released:
when F is more than 0.2 and less than or equal to 0.4, the information is more important and at least more important than the general information, and the prompt information is issued:
when F is more than 0.4 and less than or equal to 0.6, the position of the event is considered to be closer to the road side equipment, and the form environment of the vehicle on the road section can be influenced, so that the recommendation information is issued:
when F is more than 0.6 and less than or equal to 0.8, the event position is considered to be very close to the road section and belongs to the adjacent road section of the event, and mandatory information should be issued:
when 0.8 < F, the event location distance is considered to be close to the link, and thus mandatory information is issued.
CN202111216701.5A 2021-10-19 2021-10-19 Vehicle-road cooperative roadside device information publishing method based on event importance Pending CN113963559A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115762194A (en) * 2022-11-01 2023-03-07 西部科学城智能网联汽车创新中心(重庆)有限公司 Traffic control method and device

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Publication number Priority date Publication date Assignee Title
CN107437339A (en) * 2017-06-20 2017-12-05 北京交通大学 Variable information advices plate control method for coordinating and system under a kind of information guidance
KR102077315B1 (en) * 2019-11-04 2020-02-13 주식회사 세영 Intelligent Transportation Information Providing Device and Method thereof

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115762194A (en) * 2022-11-01 2023-03-07 西部科学城智能网联汽车创新中心(重庆)有限公司 Traffic control method and device
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Application publication date: 20220121