AU2020102415A4 - An adaptive traffic signal control algorithm and system based on speed monitoring - Google Patents
An adaptive traffic signal control algorithm and system based on speed monitoring Download PDFInfo
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Classifications
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- 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
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Abstract
The invention discloses an adaptive traffic signal control algorithm and system based on
speed monitoring. Taking speed information as the judgment basis, the traffic signal control
algorithm in the invention can dynamically adjust the state and display time of traffic lights,
so as to improve traffic flow at this junction. With the algorithm as the core, the traffic signal
control system can timely adjust transit time of different directions according to real-time
traffic flow, thereby reducing the occurrence of traffic congestion and ease congestion and
dredge road as soon as possible in the event of congestion. Compared with the original traffic
lights control method with a fixed duration, the method in this invention can effectively ease
traffic pressure and improve traffic capability at junctions to bring convenience to the urban
traffic.
In case 5 or 6, the red light In case 1 or 2, the green light
duration is extended. duration is extended.
Redlight Green light
Red Green light
light countdown
countdown
In case 3 or 4, the green light
duration is not extended but
turns yellow when
countdown is over.
Turn red when yellow
light's countdown is over.
In case 7 or 8, the red light
duration is not extended but
turns yellow when Yellow light
countdown is over.
Yellow
light
countdown Trgreen when
yellow light's
countdown is over.
Figure 1 a schematic diagram of the algorithm of the invention
3 oo
Figure 2 a system structure diagram of the invention
Description
In case 5 or 6, the red light In case 1 or 2, the green light duration is extended. duration is extended.
Redlight Green light
Red Green light light countdown countdown In case 3 or 4, the green light duration is not extended but turns yellow when countdown is over.
Turn red when yellow light's countdown is over.
In case 7 or 8, the red light duration is not extended but turns yellow when Yellow light countdown is over. Yellow light countdown Trgreen when yellow light's countdown is over.
Figure 1 a schematic diagram of the algorithm of the invention
3 oo Figure 2 a system structure diagram of the invention
PATENTS ACT 1990
An adaptive traffic signal control algorithm and system based on speed monitoring
The invention is described in the following statement:-
An adaptive traffic signal control algorithm and system based on speed
monitoring
The invention belongs to the technical field of intelligent transportation, specifically to an
adaptive control algorithm for adjusting duration of traffic signal in accordance with
speed monitoring and a control system based on this algorithm.
Transportation is closely related to people's production and life. It can be said that people
rely heavily on traffic. The traffic system has been developing, but in most countries and
cities, the speed of road traffic construction is far behind the speed of motor vehicles
growth. This imbalance leads to traffic congestion, frequent traffic accidents,
environmental pollution and other problems, wherein traffic congestion is the most serious.
For a long time, many domestic and overseas researchers have been committed to solve
this problem. With the development of intelligent transportation system, many traffic
control systems have been proposed. At present, the formulation process of most traffic
signal control algorithm is to sample the traffic flow information at the junction, make
statistical investigation, and then calculate the delay time of traffic lights in two directions
by using statistical principle, and set it in advance. This type of traffic lights is static
automatic adjustment. However, in practice, the traffic flow and speed of one junction are
often dynamic, and there are great differences in the traffic information of the junction at
different time, thereby, the traffic signal control strategy with fixed duration cannot meet
the actual needs. Therefore, it is necessary to seek an intelligent traffic control system, which can automatically adjust the time of traffic lights according to the changes of traffic flow and speed, minimize the number of vehicles stranded at the junction, effectively alleviate the traffic congestion, and realize the optimal control of the traffic control system, which is the adaptive traffic signal control system.
At present, the relatively perfect adaptive control systems in the world are SCOOT (Split
Cycle Offset Optimizing Technique) system in Britain and SCATS system (Sydney
Coordinated Adaptive Traffic System) in Australia, both with area control. In addition,
there are adaptive traffic light control systems for a single junction, such as the adaptive
traffic light control system based on photoelectric switch counter to calculate the traffic
flow, the adaptive traffic light control system based on wireless sensor network, and the
coordinated fuzzy congestion control system. However, most of these systems are based
on the number of vehicles to control, to a certain extent, they cannot fully reflect the
situation of the junction.
The purpose of the invention is to provide an adoptive traffic signal control algorithm and
system based on speed monitoring. Wherein, the traffic signal control algorithm is taking
speed information as the judgment basis, and the traffic signal control system is designed
with the algorithm as the core, so as to realize intelligent transportation system. The
invention can dynamically adjust the state and display time of traffic lights thereby
reducing the occurrence of traffic congestion. Besides, in the event of congestion, it can
ease the congestion situation and dredge the intersection of vehicles as soon as possible.
The specific technical scheme for realizing the purpose of the invention is as follows.
Taking speed information as the judgment basis, an adaptive traffic signal control
algorithm based on speed monitoring can dynamically adjust the state and display time of
traffic lights, specifically comprising following steps.
When the current east-west direction is green light,
if (VEW>Vmax&&V^EW>Vmax) &&(VNS<Vmin), judge whether the remaining time of
green light is less than or equal to 5 seconds. If so, extend the green light time by 10
seconds;
if (V*EW>Vmi&&VE>Vmi) &&! Empty (EWIn) && Empty (NSIn), judge whether
the remaining time of green light is less than or equal to 5 seconds. If so, extend the green
light time by 10 seconds;
if (V½EW>Vmin) && (VNS>Vmi), judge whether the remaining time of green light is greater than 5 seconds. If so, turn green light to yellow and then turn it to red after 5
seconds;
if (VEW<Vmin) && (VNS>Vmin), judge whether the remaining time of green light is
greater than 5 seconds. If so, turn green light to yellow and then turn it to red after 5
seconds.
When the current east-west direction is red light,
if (VEw <Vmin) && (V*NS>Vmax) && (VNS>Vmax), judge whether the remaining time of
red light is less than or equal to 5 seconds. If so, extend the red-light time by 10 seconds;
if Empty (EWIn) && (V*NS >Vmin) &&(V^NS>Vmin) &&! Empty (NSIn), judge
whether the remaining time of red light is less than or equal to 5 seconds. If so, extend the
green light time by 10 seconds; if (VEw >Vmin) && (VNS<Vmi), judge whether the remaining time of red light is greater than 5 seconds. If so, turn red light to yellow and then turn it to green after 5 seconds; if (VEw >Vmin) && (VNS<Vmi), judge whether the remaining time of red light is greater than 5 seconds. If so, turn red light to yellow and then turn it to green after 5 seconds.
Wherein:
V+Ew is the speed of a car from west to east at this junction; VEW is the speed of a car
from west to east leaving this junction; V*NS is the speed of a car from south to north at
this junction; VNS is the speed of a car from south to north leaving this junction; Empty
(EWIn) means no car in east-west direction; Empty (NSIn) means no cat in south-north
direction; Vmax, Vminare the maximum and minimum speed respectively.
An adaptive traffic signal control system based on above algorithm comprises speed
acquisition module, control module and traffic signal light module. Wherein, the speed
acquisition module is responsible for collecting speed information and sending it to the
control module. The control module is TLS (traffic light system) controller and connected
with speed acquisition module and traffic signal light module, respectively. It is
responsible for dynamically adjusting signal lights duration according to the received
speed information and sending out instructions to control the signal lights, meanwhile,
traffic signal light module (3) can display results. There is an adaptive traffic signal
control algorithm arranged in control module.
The speed acquisition module captures speed by OBD or road video.
The beneficial effects of the invention are as follows:
Different from the existing adaptive traffic signal control algorithm and system, the
present invention does not take the number of vehicles as the judgment condition but selects the speed as the basis to judge the junction condition and adjust the signal light display. Compared with the original traffic lights control method with a fixed duration, the method in this invention can effectively ease traffic pressure and improve traffic capability at junctions to bring convenience to the urban traffic.
Figure. 1 is a schematic diagram of the algorithm of the invention.
Figure. 2 is the system structure diagram of the invention.
The present invention is further described in combination with the attached figures and
the embodiment.
Embodiment
Taking speed information as the judgment basis, the traffic signal light control algorithm
in this invention can dynamically adjust the state and display time of traffic lights, so as
to improve traffic flow at this junction. With the algorithm at the core, the traffic signal
control system comprises speed acquisition module, control module and traffic signal
light module. Wherein, the speed acquisition module is responsible for collecting speed
information; the control module is TLS controller. As a core module, it is connected with
speed acquisition module and traffic signal light module, and responsible for data
processing and sending out instructions to control the signal lights; traffic signal light
module is controlled by the control module and is responsible for signal light display. The
speed acquisition module will constantly send speed information to TLS controller, according to which the TLS controller can make corresponding changes, such as switching and prolonging time.
As shown in Fig.1, as the core of the invention, the adaptive traffic signal control
algorithm only considers the east-west direction traffic lights, and the north-south traffic
lights reverse them, that is, when the east-west direction is red light, the north-south
direction is green light and appear yellow light in both directions. On the contrary, when
the east-west direction is green light, the north-south direction is red light. At the same
time, in order to avoid the conflict of control, only vehicles from west to east and from
south to north are considered.
The meaning of each symbol in the algorithm is as follows:
V+Ew is the speed of a car from west to east at this junction; VEW is the speed of a car
from west to east leaving this junction; V*NS is the speed of a car from south to north at
this junction; VNS is the speed of a car from south to north leaving this junction; Empty
(EWIn) means no car in east-west direction; Empty (NSIn) means no cat in south-north
direction; Vmax, Vminare the maximum and minimum speed respectively.
After receiving the vehicle speed information, the algorithm adjusts the signal light
duration according to the following methods.
When the current east-west direction is green light,
case 1, if (V*EW>Vmin&&VE>Vmin) &&! Empty (EWIn) && Empty (NS_In), judge
whether the remaining time of green light is less than or equal to 5 seconds. If so, extend
the green light time by 10 seconds; case 2, if (VEW>Vmin) && (V^NS>Vmin), judge whether the remaining time of green light is greater than 5 seconds. If so, turn green light to yellow and then turn it to red after 5 seconds; case 3, if (VEW>Vmin) && (VNS>Vmin), judge whether the remaining time of green light is greater than 5 seconds. If so, turn green light to yellow and then turn it to red after 5 seconds; case 4, if (VEW<Vmin) && (VNS>Vmin), judge whether the remaining time of green light is greater than 5 seconds. If so, turn green light to yellow and then turn it to red after 5 seconds.
When the current east-west direction is red light,
case 5, if (VEW<Vmin) && (V*NS>Vmax) && (VNS>Vmax), judge whether the remaining
time of red light is less than or equal to 5 seconds. If so, extend the red light time by 10
seconds;
case 6, if Empty (EWIn) && (V*NS >Vmin) &&(V^NS>Vmin) &&! Empty (NSIn), judge
whether the remaining time of red light is less than or equal to 5 seconds. If so, extend the
green light time by 10 seconds;
case 7, if (VEW>Vmin) && (VNS<Vmin), judge whether the remaining time of red light is
greater than 5 seconds. If so, turn red light to yellow and then turn it to green after 5
seconds;
case 8, if (VEW>Vmin) && (V*NS<Vmin), judge whether the remaining time of red light is
greater than 5 seconds. If so, turn red light to yellow and then turn it to green after 5
seconds.
As shown in Fig.2, there are three modules in the control system of the invention,
acquisition module (1), control module (2) and traffic signal light module (3), respectively.
The present invention is applicable to a crossroad. In order to reduce the complexity of
the system and facilitate the implementation, the situation of turning left or right is not
considered temporarily, that is, assuming that the vehicles passing through the junction in
each direction go straight. The invention adjusts the time length of the signal according to
the speed at the junction in the east-west direction and the north-south direction and the
speed of the next road section.
(1) Speed Acquisition Module
The speed acquisition module (1) is used to collect vehicle speed information. In this
embodiment, the vehicle speed information source is the vehicle video of the junction
communication. The module includes video processing and communication module. The
camera is installed on the road to collect real-time video information, and the video is
analyzed by video processing technology to obtain the speed information of each
direction at the current junction and the next road section. After collecting the real-time
speed, the speed acquisition module transmits the speed information to the control
module.
(2) Control Module
Control module is a TLS controller, responsible for data processing and sending out
instructions to control the signal lights. It uses the adaptive traffic signal control
algorithm described in the invention.
The control module controls two signal lights in the east-west direction and the north
south direction respectively, and the signal lights have two states of red light and green light. The control effect of the control module can be but not limited to when there is no special situation, the duration of red light and green light is 60 seconds. According to the road experience, set two critical speeds - Vmax is 40 km/h and Vminis 20 km/h. When the speed collected by the speed acquisition module exceeds Vmax, the road is unblocked, and when the speed is less than Vmin, the road is congested. Under the above conditions, the
TLS controller will control the duration of the signal lights according to the real-time
vehicle speed and the current state of the signal lights. The specific control effect can be
but not limited to the following situations:
a) When the current traffic signal light is green,
if the junction or the next section of the road is congested, turn the green light into red; if
one of the following two situations occurs, extend the green light time,
i) the current direction is unblocked, and the orthogonal direction is congested.
ii) there is no congestion in the current direction and there are vehicles ready to pass
through the intersection, and there is no vehicle passing in the orthogonal direction.
b) When the current traffic signal light is red,
if the orthogonal direction is also red light and the current direction is not congested,
shorten the red-light time; if one of the following two situations occurs, extend the red
light time:
i)congestion occurs in the current direction, and the road in the orthogonal direction
is smooth.
ii)there is no traffic in the current direction, and there is no congestion in the
orthogonal direction, and there are vehicles ready to pass the intersection
In addition, the TLS controller checks the remaining time and the held time of the current
signal lights before performing the action of extending or shortening the signal lights
duration. If the remaining time of the signal lights exceeds 10 seconds, it will not extend
the time; if the remaining time is less than 10 seconds, it will not shorten the time; if the
remaining time is less than 30 seconds, no red-green conversion will be carried out. The
purpose is to avoid the signal lights switching too frequently or causing waste of
resources.
(3) Traffic Signal Light Module
The traffic signal light module includes the signal lights set in the east-west and north
south directions, and each signal light has two states of red and. The signal light module
is connected with and controlled by the above-mentioned TLS control module to display
accordingly.
The above embodiments only describe the preferred mode of the invention, but do not
limit the scope of the invention. On the premise of not departing from the design spirit of
the invention, various modifications and improvements made to the invention shall fall
within the technical scope of the invention.
Claims (3)
1.An adaptive traffic signal control algorithm based on speed monitoring, characterized in
that taking speed information as the judgment basis, it can dynamically adjust the state
and display time of traffic lights, specifically comprising following steps.
When the current east-west direction is green light,
if (VEW>Vmax&&VEW>Vmax) &&(VNS<Vmin), judge whether the remaining time of
green light is less than or equal to 5 seconds. If so, extend the green light time by 10
seconds;
if (V*EW>Vmi&&VE>Vmin) &&! Empty (EWIn) && Empty (NSIn), judge whether
the remaining time of green light is less than or equal to 5 seconds. If so, extend the green
light time by 10 seconds;
if (V½EW>Vmin) && (VNS>Vmi), judge whether the remaining time of green light is greater than 5 seconds. If so, turn green light to yellow and then turn it to red after 5
seconds;
if (VEW<Vmin) && (VNS>Vmin), judge whether the remaining time of green light is
greater than 5 seconds. If so, turn green light to yellow and then turn it to red after 5
seconds.
When the current east-west direction is red light,
if (VEw <Vmin) && (V*NS>Vmax) && (VNS>Vmax), judge whether the remaining time of
red light is less than or equal to 5 seconds. If so, extend the red-light time by 10 seconds;
if Empty (EWIn) && (V*NS >Vmin) &&(V^NS>Vmin) &&! Empty (NSIn), judge
whether the remaining time of red light is less than or equal to 5 seconds. If so, extend the
green light time by 10 seconds; if (V^Ew >Vmin) && (V^NS<Vmin),judge whether the remaining time of red light is greater than 5 seconds. If so, turn red light to yellow and then turn it to green after 5 seconds; if (VEw>Vmin) && (V*NS<Vmin), judge whether the remaining time of red light is greater than 5 seconds. If so, turn red light to yellow and then turn it to green after 5 seconds.
Wherein:
V+Ewis the speed of a car from west to east at this junction; V^EW is thespeedofacar
from west to east leaving this junction; V*NSis the speed of a car from south to north at
this junction; V^Ns is the speed of a car from south to north leaving this junction; Empty
(EWIn) means no car in east-west direction; Empty (NSIn) means no cat in south-north
direction; Vmax, Vminare the maximum and minimum speed respectively.
2.An adaptive traffic signal control system based on control algorithm in claim 1,
characterized by comprising speed acquisition module (1), control module (2) and traffic
signal light module (3). Wherein, the speed acquisition module (1) is responsible for
collecting speed information and sending it to the control module (2). The control module
(2) is TLS controller, and connected with speed acquisition module (1) and traffic signal
light module (3), respectively. It is responsible for dynamically adjusting signal lights
duration according to the received speed information and sending out instructions to
control the signal lights, meanwhile, traffic signal light module (3) can display results.
There is an adaptive traffic signal control algorithm arranged in control module (2).
3.The adaptive traffic signal control system according to claim 1, characterized in that the
speed acquisition module (1) captures speed by OBD or road video.
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| AU2020102415A AU2020102415A4 (en) | 2020-09-24 | 2020-09-24 | An adaptive traffic signal control algorithm and system based on speed monitoring |
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| AU2020102415A AU2020102415A4 (en) | 2020-09-24 | 2020-09-24 | An adaptive traffic signal control algorithm and system based on speed monitoring |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114937354A (en) * | 2022-05-05 | 2022-08-23 | 南通智慧交通科技有限公司 | City monitoring system that assembles based on internet |
| WO2023065057A1 (en) * | 2021-10-22 | 2023-04-27 | 孟卫平 | Method based on intelligent traffic signal control architecture |
-
2020
- 2020-09-24 AU AU2020102415A patent/AU2020102415A4/en not_active Ceased
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023065057A1 (en) * | 2021-10-22 | 2023-04-27 | 孟卫平 | Method based on intelligent traffic signal control architecture |
| CN114937354A (en) * | 2022-05-05 | 2022-08-23 | 南通智慧交通科技有限公司 | City monitoring system that assembles based on internet |
| CN114937354B (en) * | 2022-05-05 | 2023-09-05 | 南京补天科技实业有限公司 | Urban monitoring convergence system based on Internet |
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