CN115376341A - Ramp traffic signal lamp self-adaptive control method based on RFID - Google Patents

Ramp traffic signal lamp self-adaptive control method based on RFID Download PDF

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CN115376341A
CN115376341A CN202210957906.7A CN202210957906A CN115376341A CN 115376341 A CN115376341 A CN 115376341A CN 202210957906 A CN202210957906 A CN 202210957906A CN 115376341 A CN115376341 A CN 115376341A
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ramp
time
road
red light
rfid
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Inventor
赵明
熊海波
秦显国
张鹏
张茗
刘恩全
胡芮嘉
钟添翼
钟继科
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TRAFFIC MANAGEMENT BUREAU OF CHONGQING PUBLIC SECURITY BUREAU
Chongqing Chengtou Gold Card Information Industry Group Co ltd
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TRAFFIC MANAGEMENT BUREAU OF CHONGQING PUBLIC SECURITY BUREAU
Chongqing Chengtou Gold Card Information Industry Group Co ltd
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Priority to CN202210957906.7A priority Critical patent/CN115376341A/en
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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
    • G08G1/095—Traffic lights
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/07—Controlling traffic signals
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/07—Controlling traffic signals
    • G08G1/081—Plural intersections under common control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

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  • General Physics & Mathematics (AREA)
  • Traffic Control Systems (AREA)

Abstract

The invention provides a ramp traffic signal lamp self-adaptive control method based on RFID, which comprises the following steps: arranging RFID acquisition equipment at the ramp of the road, acquiring traffic flow information by the RFID acquisition equipment, and determining the unit time length of the red light
Figure DDA0003792076160000011
Determining the regulation rate r (k) of the current entrance ramp; judging whether the regulation rate r (k) of the entrance ramp is larger than the set maximum regulation rate value r max If yes, setting the traffic light of the entrance ramp to be evergreen, and if not, calculating the red light time of the entrance ramp
Figure DDA0003792076160000012
And green time
Figure DDA0003792076160000013
Judging whether the headway time of the outside lane is larger than a critical value, if so, setting the red light time of the entrance ramp as the unit duration of the red light
Figure DDA0003792076160000014
If not, judging the threshold range state of the inter-head distance of the vehicles on the outer lane, and determining the red light time of the entrance ramp
Figure DDA0003792076160000015
Controlling traffic signal lights of an entrance ramp to be in red according to time
Figure DDA0003792076160000016
Work is carried out when
Figure DDA0003792076160000017
Maximum red light time
Figure DDA0003792076160000018
Then the traffic signal light of the entrance ramp is controlled according to

Description

Ramp traffic signal lamp self-adaptive control method based on RFID
Technical Field
The invention relates to a traffic signal lamp control method, in particular to a ramp traffic signal lamp self-adaptive control method based on RFID.
Background
The increase of urban vehicles directly causes traffic jam, particularly the jam condition of some critical intersections is more serious, and the traffic signal lamp is an effective means for regulating the traffic flow of the intersections and relieving the jam.
In the prior art, traffic lights are generally adopted to work in a fixed time length mode in order to relieve congestion at an intersection, but the traffic flow state of a road is not considered, so that a main road or a ramp of the intersection is congested, and the traffic is seriously influenced.
Therefore, in order to solve the above technical problems, it is necessary to provide a new technical means.
Disclosure of Invention
In view of the above, the present invention provides an adaptive control method for a ramp traffic signal lamp based on RFID, which dynamically adjusts the lighting time of the traffic signal lamp based on the time occupancy of a road according to the traffic flow state of a target intersection, and can effectively and reasonably schedule the traffic state of the target intersection, thereby effectively alleviating road congestion and improving the operation efficiency of the road.
The invention provides a ramp traffic signal lamp self-adaptive control method based on RFID, which comprises the following steps:
s1, arranging RFID (radio frequency identification) acquisition equipment at a road ramp and acquiring traffic flow information by the RFID acquisition equipment, wherein the traffic flow information comprises the speed v of a lane outside a road 1 And saturation flow rate S of the inlet ramp r And determining the unit time length of red light
Figure BDA00037920761400000215
S2, determining the regulation rate r (k) of the current entrance ramp:
r(k)＝μ·r 1 (k)+(1-μ)r 2 (k)；
wherein: mu is a weight coefficient between road time occupancy and speed, r 1 (k) Is the regulation rate of the time occupancy of the ramp at the time k, r 2 (k) The speed regulation rate of the ramp;
S3judging whether the regulation rate r (k) of the entrance ramp is greater than the set maximum regulation rate value r max If yes, setting the traffic light of the entrance ramp to be evergreen, and if not, calculating the red light time of the entrance ramp
Figure BDA0003792076140000021
And green time
Figure BDA0003792076140000023
S4, judging whether the headway time of the outer lane is larger than a critical value or not, if so, setting the red light time of the entrance ramp to be the red light unit time length
Figure BDA0003792076140000024
If not, judging the threshold range state of the distance between the vehicle heads of the vehicles on the outer lane, and determining the red light time of the entrance ramp
Figure BDA0003792076140000025
Figure BDA0003792076140000026
Wherein: i =0,1,2,3, \ 8230;, m, representing the ith threshold range;
controlling traffic signal lights of an entrance ramp to be in red according to time
Figure BDA0003792076140000027
Work is carried out when
Figure BDA0003792076140000028
Time to maximum red light
Figure BDA0003792076140000029
Then the traffic signal light of the entrance ramp is controlled according to
Figure BDA00037920761400000210
And (6) carrying out work.
Further, in step S1, a red light is providedDuration per unit
Figure BDA00037920761400000211
Is determined by the following method:
Figure BDA00037920761400000212
wherein L is 1 And the distance from the RFID acquisition point to the entrance ramp is obtained.
Further, in step S2, the adjustment rate r of the time occupancy of the ramp at time k is determined by the following method 1 (k)：
Figure BDA00037920761400000213
Wherein: q (k-1) is the traffic flow of the entrance ramp at the time of k-1,
Figure BDA00037920761400000214
to adjust the coefficient, o c Is a time occupancy threshold of the outer lane, o u And (k-1) is the time occupancy of the outer lane at the time k-1.
Further, in step S2, the speed regulation rate r of the ramp is determined by the following method 2 (k)：
Figure BDA0003792076140000031
Wherein: q (k-1) is the traffic flow of the entrance ramp at the time of k-1,
Figure BDA0003792076140000032
to adjust the coefficient, v u (k-1) vehicle speed of outside lane, v c Is the critical speed of the outboard lane.
Further, the critical speed v of the outer lane is determined by the following method c ：
v c =23.472+6.045 × ALW-45.188 × HVR2-0.163 × RI-5.536 × BSI; wherein: ALW is lane width, HVR2 is road bus occupancy, and RI is the number of entrance ramps and exit ramps within a set distance between the upstream road and the downstream road of the current road positionAnd BSI sets the bus occupancy within a set distance for the upstream road and the downstream road of the position of the current road.
Further, the time occupancy threshold value o of the outer lane is determined by the following method c ：
o c ＝165.525-11.445×Laneno+5.680×ALW+104.125×HVR2
Wherein: ALW is lane width, HVR2 is road bus occupancy, BSI is bus occupancy within a set distance of an upstream road and a downstream road of the current road, and Laneno is the number of lanes of the road.
The invention has the beneficial effects that: according to the invention, the lighting time of the traffic signal lamp is dynamically adjusted based on the time occupancy of the road according to the traffic flow state of the target intersection, and the traffic state of the target intersection can be effectively and reasonably scheduled, so that the road congestion is effectively relieved, and the running efficiency of the road is improved.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is further described in detail below:
the invention provides a ramp traffic signal lamp self-adaptive control method based on RFID, which comprises the following steps:
s1, arranging RFID (radio frequency identification) acquisition equipment at a road ramp and acquiring traffic flow information by the RFID acquisition equipment, wherein the traffic flow information comprises the speed v of a lane outside a road 1 And the saturation flow rate S of the inlet ramp r And determining the unit time length T of the red light Rmin ；
S2, determining the regulation rate r (k) of the current entrance ramp:
r(k)＝μ·r 1 (k)+(1-μ)r 2 (k)；
wherein: mu is a weight coefficient between road time occupancy and speed, r 1 (k) Is the regulation rate of the time occupancy of the ramp at the time k, r 2 (k) The speed regulation rate of the ramp;
s3, judging whether the regulation rate r (k) of the entrance ramp is greater than the set maximum regulation rate value r max If yes, setting the traffic light of the entrance ramp to be normally green, and if not, calculating the red light time of the entrance ramp
Figure BDA0003792076140000041
And green time
Figure BDA0003792076140000042
S4, judging whether the time interval of the vehicle head of the outer lane is larger than a critical value, if so, setting the red light time of the entrance ramp as the unit time length of the red light
Figure BDA0003792076140000043
If not, judging the threshold range state of the distance between the vehicle heads of the vehicles on the outer lane, and determining the red light time of the entrance ramp
Figure BDA0003792076140000044
Figure BDA0003792076140000045
Wherein: i =0,1,2,3, \8230;, m, representing the ith threshold range; for example, the following steps: the headway has 5 threshold ranges, i.e., Y1= (S1, S2)],Y2＝(S2,S3],Y3＝(S3,S4],Y4＝(S4,S5],Y5＝(S5,S6]Wherein, S1>S2>S3>S4>S5; when the distance between the vehicle heads is Y1, the value of i is 1, when the distance between the vehicle heads is in a 5 th threshold range, the value of i is 5, namely the unit time length of lighting 5 red lamps is increased, when the distance between the vehicle heads is greater than or equal to S1, the value of i is 0, and the traffic signal lamp is controlled to work according to the calculated red lamp lighting time length; if, when i takes on the value of 4, then calculated
Figure BDA0003792076140000046
The time length of the red light is
Figure BDA0003792076140000047
Even if the current value of i is 5, the red light is still turned on for the duration of
Figure BDA0003792076140000048
The value of the threshold range is determined according to the actual road environment and traffic related regulations, and belongs to the prior art;
controlling traffic signal lights of an entrance ramp to be in red according to time
Figure BDA0003792076140000049
Work is carried out when
Figure BDA00037920761400000410
Time to maximum red light
Figure BDA0003792076140000059
Then the traffic signal light of the entrance ramp is controlled according to
Figure BDA0003792076140000051
And (5) working.
Wherein:
Figure BDA0003792076140000052
c is the period of the traffic signal lamp, and A is the lighting time of the yellow lamp.
In this embodiment, in step S1, the unit duration of red light
Figure BDA0003792076140000053
Is determined by the following method:
Figure BDA0003792076140000054
wherein L is 1 The distance from the RFID acquisition point to the entrance ramp.
In this embodiment, in step S2, the adjustment rate r of the time occupancy of the ramp at time k is determined by the following method 1 (k)：
Figure BDA0003792076140000055
Wherein: q (k-1) is the traffic flow of the entrance ramp at the time of k-1,
Figure BDA0003792076140000056
to adjust the coefficient, o c Is the time occupancy threshold of the outer lane, o u And (k-1) is the time occupancy of the outer lane at the time k-1.
In the present embodiment, in step S2, the speed adjustment rate r of the ramp is determined as follows 2 (k)：
Figure BDA0003792076140000057
Wherein: q (k-1) is the traffic flow of the entrance ramp at the time of k-1,
Figure BDA0003792076140000058
to adjust the coefficient, v u (k-1) vehicle speed of outside lane, v c Is the critical speed of the outboard lane.
In the present embodiment, the critical speed v of the outer lane is determined by the following method c ：
v c =23.472+6.045 × ALW-45.188 × HVR2-0.163 × RI-5.536 × BSI; wherein: ALW is lane width, HVR2 is road bus occupancy, RI is the number of entrance and exit ramps within a set distance of an upstream road and a downstream road of the current road, and BSI is the bus occupancy within a set distance of the upstream road and the downstream road of the current road.
In the present embodiment, the time occupancy threshold value o of the outer lane is determined by the following method c ：
o c ＝165.525-11.445×Laneno+5.680×ALW+104.125×HVR2
Wherein: ALW is lane width, HVR2 is road bus occupancy, BSI is bus occupancy within a set distance of an upstream road and a downstream road of a current road position, and Laneno is the number of lanes of the road.
By the method, the lighting time of the traffic signal lamp is dynamically adjusted based on the time occupancy of the road according to the traffic flow state of the target intersection, and the traffic state of the target intersection can be effectively and reasonably scheduled, so that road congestion is effectively relieved, and the running efficiency of the road is improved.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims (6)

1. A ramp traffic signal lamp self-adaptive control method based on RFID is characterized in that: the method comprises the following steps:
s1, arranging RFID (radio frequency identification) acquisition equipment at a road ramp and acquiring traffic flow information by the RFID acquisition equipment, wherein the traffic flow information comprises the speed v of a lane outside a road 1 And the saturation flow rate S of the inlet ramp r And determining the unit time length of red light
Figure FDA0003792076130000011
S2, determining the regulation rate r (k) of the current entrance ramp:
r(k)＝μ·r 1 (k)+(1-μ)r 2 (k)；
wherein: mu is a weight coefficient between road time occupancy and speed, r 1 (k) Is the regulation rate of the time occupancy of the ramp at the time k, r 2 (k) The speed regulation rate of the ramp;
s3, judging whether the regulation rate r (k) of the entrance ramp is greater than the set maximum regulation rate value r max If yes, setting the traffic light of the entrance ramp to be evergreen, and if not, calculating the red light time of the entrance ramp
Figure FDA0003792076130000012
And green time
Figure FDA0003792076130000013
S4, judging whether the time interval of the vehicle head of the outer lane is larger than a critical value, if so, setting the red light time of the entrance ramp as the unit time length of the red light
Figure FDA0003792076130000014
If not, judging the threshold range state of the distance between the vehicle heads of the vehicles on the outer lane, and determining the red light time of the entrance ramp
Figure FDA0003792076130000015
Figure FDA0003792076130000016
Wherein: i =0,1,2,3, \8230;, m, representing the ith threshold range;
controlling traffic signal lights of an entrance ramp to be in red according to time
Figure FDA0003792076130000017
Work is carried out when
Figure FDA0003792076130000018
Time to maximum red light
Figure FDA0003792076130000019
Then the traffic signal light of the entrance ramp is controlled according to
Figure FDA00037920761300000110
And (6) carrying out work.
2. The self-adaptive control method for the RFID-based ramp traffic signal lamp according to claim 1, characterized in that: in step S1, red light unit time length
Figure FDA00037920761300000111
By such asThe following method is used for determining:
Figure FDA00037920761300000112
wherein L is 1 And the distance from the RFID acquisition point to the entrance ramp is obtained.
3. The RFID-based ramp traffic signal lamp self-adaptive control method according to claim 1, characterized in that: in step S2, the adjustment rate r of the time occupancy of the ramp at the time k is determined by the following method 1 (k)：
Figure FDA0003792076130000021
Wherein: q (k-1) is the traffic flow of the entrance ramp at the time of k-1,
Figure FDA0003792076130000022
to adjust the coefficient, o c Is a time occupancy threshold of the outer lane, o u And (k-1) is the time occupancy of the outer lane at the time k-1.
4. The self-adaptive control method for the RFID-based ramp traffic signal lamp according to claim 1, characterized in that: in step S2, the speed regulation rate r of the ramp is determined by the following method 2 (k)：
Figure FDA0003792076130000023
Wherein: q (k-1) is the traffic flow of the entrance ramp at the time of k-1,
Figure FDA0003792076130000024
to adjust the coefficient, v u (k-1) vehicle speed of outside lane, v c Is the critical speed of the outboard lane.
5. The self-adaptive control method for the RFID-based ramp traffic signal lamp according to claim 4, whereinCharacterized in that: determining the critical speed v of the outer lane by c ：
v c =23.472+6.045 × ALW-45.188 × HVR2-0.163 × RI-5.536 × BSI; it is provided with
The method comprises the following steps: ALW is lane width, HVR2 is road bus occupancy, RI is the number of entrance and exit ramps within a set distance of an upstream road and a downstream road of the current road, and BSI is the bus occupancy within a set distance of the upstream road and the downstream road of the current road.
6. The RFID-based ramp traffic signal lamp self-adaptive control method according to claim 3, characterized in that: the time occupancy threshold o of the outer lane is determined by c ：
o c ＝165.525-11.445×Laneno+5.680×ALW+104.125×HVR2
Wherein: ALW is lane width, HVR2 is road bus occupancy, BSI is bus occupancy within a set distance of an upstream road and a downstream road of the current road, and Laneno is the number of lanes of the road.
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CN117079480A (en) * 2023-10-13 2023-11-17 之江实验室 Control method and device for expressway ramp traffic signal lamp

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CN117079480B (en) * 2023-10-13 2024-01-09 之江实验室 Control method and device for expressway ramp traffic signal lamp

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