CN110111589B - Dynamic road traffic signal control system and method - Google Patents
Dynamic road traffic signal control system and method Download PDFInfo
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- CN110111589B CN110111589B CN201910387389.2A CN201910387389A CN110111589B CN 110111589 B CN110111589 B CN 110111589B CN 201910387389 A CN201910387389 A CN 201910387389A CN 110111589 B CN110111589 B CN 110111589B
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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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- 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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Abstract
The invention discloses a dynamic road traffic signal control system and method, comprising a signal receiving and processing circuit and a signal lamp control and energy circuit, wherein the signal receiving and processing circuit comprises a filter capacitor C1, a detection module SIP4, a pin expansion and relay module and a 52 single-chip microcomputer U1; the signal lamp control and energy circuit comprises a plurality of signal lamp branches, wherein the luminous LEDs in each signal lamp branch are arranged in the buried signal lamps, and the buried signal lamps are buried on each lane line; each of the incoming side and the outgoing side of each buried signal lamp is provided with a luminous LED which is visible only by a unidirectional incoming vehicle; the driving direction of one lane is changed through the three stages of an initial state, a conversion state and an end state. The invention is used for extending the traffic signal lamp at the road section at the intersection, and obviously improves the precision and flexibility of road resource allocation; the road-mounted intelligent control system is more flexible in parameters such as mounting distance, the arrangement mode can be designed and implemented according to road conditions, and the road-mounted intelligent control system can fully meet requirements and solve specific problems.
Description
Technical Field
The invention relates to the technical field of traffic signal control, in particular to a dynamic road traffic signal control system and a dynamic road traffic signal control method.
Background
With the development of economy, the quantity of urban automobiles is increased, but most of urban infrastructures in China are late in construction and lack of prospective, so that the contradiction between automobiles and road space resources is increased, and the most obvious phenomenon is traffic jam. When the locomotive is in different working states (idle speed, acceleration, uniform speed and deceleration), the influence on traffic emission is different, and the emission is increased when the locomotive is frequently in the deceleration or idle state. Under traffic congestion, automobiles are frequently in a decelerating or idling state, so that the long-term traffic congestion causes extremely waste of petroleum and natural gas resources and great increase of emission of atmospheric pollutants. The space resources of the road can be fully utilized in real time by the variable lanes, the space resources are redistributed by changing the driving direction of the road, and the problem of traffic jam can be relieved to a great extent, so that the automobile emission and energy consumption caused by the traffic jam are greatly reduced, and great economic and environmental benefits are brought to individuals and society.
At present, a traffic signal device using a wireless communication technology appears, for example, a wireless traffic signal lamp management system disclosed in China patent application No. 201811560050.X, and the management system is used for carrying out operation management on traffic signals arranged at an intersection, only optimizes from the aspects of construction and technology, and has no direct scheme for the problem of low utilization rate of road space.
As disclosed in the chinese patent application No. 201811579784.2, the light control system of the patent adopts a buried mode, but adopts a mode of raising and lowering a warning member to realize opening and closing of the tidal lane, and has the problems of high construction cost and increased running risk due to the change of the depth of the mechanism and the ground space, and is difficult to be used on the road which is already built.
The road signal systems described in both patents either improve control over real-time data based on conventional road signal systems or use less flexible devices for tidal lane guidance, which is also lacking in terms of road utilization efficiency.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a safe and reliable dynamic road traffic signal control system and method capable of providing road vehicle driving signals according to the requirements and real-time traffic conditions. The technical proposal is as follows:
a dynamic road traffic signal control system comprises a signal receiving and processing circuit and a signal lamp control and energy circuit;
the signal receiving and processing circuit comprises a filter capacitor C1, a detection module SIP4, a pin expansion and relay module and a 52 single chip microcomputer U1; the filter capacitor C1 is connected in parallel with two ends of a direct current stabilized voltage supply for supplying power to the detection module SIP4, the pin expansion and relay module and the 52 singlechip U1; SDA and SCl pins of the detection module SIP4 are respectively connected with P2B1 and P2B2 pins of the 52 single chip microcomputer U1, so that detection signals and control signals are output; SER, RCLK and SCl pins of the pin expansion and relay module are respectively connected with P3B4, P3B5 and P3B6 pins of the 52 single chip microcomputer U1;
the signal lamp control and energy circuit comprises a plurality of signal lamp branches, wherein one end of a current limiting resistor R of each signal lamp branch is connected with a power supply VCC, the other end of the current limiting resistor R is connected with the positive end of a luminous LED, and the negative end of the luminous LED is connected with the drain electrode d of an N-channel enhancement MOS tube Q; the source electrode s of the N channel enhancement type MOS tube Q is grounded, and the grid electrode g is connected with the QA pin of the pin expansion and relay module in the signal receiving and processing circuit;
the luminous LEDs in each signal lamp branch are arranged in the buried signal lamps, and a plurality of buried signal lamps are buried on each lane line; each of the incoming and outgoing sides of each buried signal lamp is provided with a light emitting LED visible only to one-way incoming vehicles.
Further, an embedded part is arranged at the lower part of the buried signal lamp, the bottom end of the embedded part is buried in the ground, a lamp holder is arranged at the top end of the embedded part, two light-emitting LEDs are arranged on the lamp holder, and a trapezoid table for isolating light is arranged between the two light-emitting LEDs; the lamp stand top is equipped with the apron, and the apron is provided with the transparent window in the position that corresponds to luminous LED.
Furthermore, the two side surfaces of the trapezoid table are respectively provided with a light reflecting panel.
Furthermore, the cover plate, the lamp holder and the embedded part are fixedly connected through fixing screws.
A dynamic road traffic signal control method, comprising the steps of:
step 1: detecting traffic flow information in real time, and calculating a congestion ratio R:
calculating the congestion coefficient of the unidirectional lane as C:
C＝k 1 p+k 2 q
wherein k is 1 、k 2 Is a weight coefficient; p is the current road section lane occupancy, q is the current road section speed utilization, andv is the average running speed of the vehicle at the current road section, and V is the speed limit of the vehicle at the current road section; the congestion ratio R is:
wherein C is 1 C is a traffic jam coefficient of a certain direction lane 2 Congestion coefficients for its subtended lanes;
step 2: judging according to the congestion ratio R: if the congestion ratio R exceeds the preset value, jumping to the step 5, otherwise, entering the step 3;
step 3: judging whether the lane is changed; if yes, jumping to the step 5; otherwise, entering a step 4;
step 4: keeping the lane unchanged, and ending the lane change;
step 5: ready to enter a lane change state: acquiring Fang Lukou traffic light information before a lane to be changed, and judging whether the current traffic light is in a red light or yellow light stage; if yes, jumping to the step 7, otherwise, entering the step 6;
step 6: after the traffic light enters a red light stage, jumping to the step 5;
step 7: after the traffic light enters a green light stage, controlling a current incoming side light emitting LED of a buried signal lamp on a lane line at the right side of the current vehicle direction of a lane to be changed to enter a yellow light warning stage;
step 8: judging whether the current traffic light is at the moment of entering the green light stage, and whether the vehicle is not detected in the zone to be changed of the lane; if yes, jumping to the step 10, otherwise, entering the step 9;
step 9: controlling the yellow light warning stage to at least keep until the arrival moment of the green light stage of the next traffic light, and then jumping to the step 8;
step 10: and controlling the light-emitting LED entering the yellow light warning stage to be changed into a red light, and controlling the light-emitting LED on the current coming vehicle side of the buried signal lamp on the lane line on the other side of the lane to be changed into a green light, so that the lane change is completed.
The beneficial effects of the invention are as follows:
1) The invention is used for extending the traffic signal lamp at the road section at the intersection, and obviously improves the precision and flexibility of road resource allocation; the system is more flexible in parameters such as installation distance, the arrangement mode can be designed and implemented according to road conditions, the system can fully meet requirements and solve specific problems;
2) The invention can access external indication by the control of the singlechip, and can upgrade the system by combining big data and the like, thereby being more intelligent;
3) The invention adopts the reflector to limit the signal emission angle and direction, so that the overall structure is buried without protruding, frequent collision and extrusion of vehicles to the device can be avoided, and maintenance and repair costs are reduced.
Drawings
Fig. 1 is a schematic circuit diagram of a dynamic road traffic signal control system according to the present invention.
Fig. 2 is a three-dimensional view of the overall structure of a buried signal lamp in the dynamic road traffic signal control system of the present invention.
Fig. 3 is a three-dimensional view of the buried signal lamp with the housing removed.
Fig. 4 is a transverse cross-sectional view of the internal structure of the present buried signal lamp.
Fig. 5 is a top view of the dynamic road traffic signal control system of the present invention in an initial state during operation.
Fig. 6 is a top view of the dynamic road traffic signal control system of the present invention in operation as a change state.
Fig. 7 is a top view of the end state of the dynamic road traffic signal control system of the present invention in operation.
In the figure: 1-an embedded part; 2-cover plate; 3-fixing screws; 4-a transparent window; 5-lamp holder; 6-emitting LEDs; 7-a light reflecting panel; 8-electric wires; 9-a signal receiving and processing circuit; 10-a signal lamp control and energy circuit; 11-trapezoidal table.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples. As shown in fig. 1, a dynamic road traffic signal control system includes a signal receiving and processing circuit 9 and a signal lamp control and energy circuit 10.
The signal receiving and processing circuit 9 comprises a filter capacitor C1, a detection module SIP4, a pin expansion and relay module and a 52 single chip microcomputer U1; the filter capacitor C1 is connected in parallel with two ends of a direct current stabilized voltage supply for supplying power to the detection module SIP4, the pin expansion and relay module and the 52 singlechip U1. The relay module power supply may be independent as appropriate in view of the line. SDA and SCl pins of the detection module SIP4 are respectively connected with P2B1 and P2B2 pins of the 52 single chip microcomputer U1, so that detection signals and control signals are output; the pin setting of the detection module SIP4 may be adjusted as appropriate, and in fig. 1, an ultrasonic module is taken as an example of SIP4 to give a connection mode. SER, RCLK and SCl pins of the pin expansion and relay module are respectively connected with P3B4, P3B5 and P3B6 pins of the 52 single chip microcomputer U1; the wiring of the pin expansion and relay module refers to 74HC595, so that the module with stronger performance can be flexibly selected for substitution. The minimum system circuit of the singlechip U1 is hidden 52 in the figure, and the minimum system circuit is not critical to the design.
The signal lamp control and energy circuit 10 comprises a plurality of signal lamp branches, wherein one end of a current limiting resistor R of each signal lamp branch is connected with a power supply VCC, the other end of the current limiting resistor R is connected with the positive electrode end of a luminous LED6, and the negative electrode end of the luminous LED6 is connected with the drain electrode d of an N-channel enhancement type MOS tube Q; the source electrode s of the N channel enhancement MOS tube Q is grounded, and the grid electrode g is connected with the QA pin of the pin expansion and relay module in the signal receiving and processing circuit 9. The luminous LEDs 6 in each signal lamp branch are arranged in buried signal lamps, and a plurality of buried signal lamps are buried on each lane line; each buried signal lamp is provided with a light emitting LED6 visible only in one direction on the coming and going sides.
Circuit principle and working process: after power is applied, the signal receiving and processing circuit 9 and the signal lamp control and energy circuit 10 are put into operation. The detection module SIP4 starts to collect signals and transmits them to the 52 single-chip microcomputer U1. After the signal is processed by the 52 single chip microcomputer U1, a signal is sent to the pin expansion and relay module according to judgment, and a lighting instruction is sent to the signal lamp control and energy circuit 10 and other signal lamps and the interrupt Ln through the pin expansion and relay module respectively. After the signal lamp control and energy circuit 10 receives the lighting instruction, taking a series of lighting circuits with a digital subscript 1 as an example, the grid electrode g of the Q1 receives a high level, and is conducted when Vgs (gate source voltage) > Vt (conducting voltage) and Vds (drain source voltage) > Vgs-Vt are conducted according to the characteristics of the MOS tube, and the cathode of the LED1 is grounded to generate a voltage difference to drive the LED1 to emit light.
As shown in fig. 2, 3 and 4, the embedded part 1 is arranged at the lower part of the buried signal lamp in the embodiment, the bottom end of the embedded part 1 is buried in the ground, the top end of the embedded part is provided with a lamp holder 5, two light-emitting LEDs 6 are arranged on the lamp holder 5, and a trapezoid table 11 for isolating light is arranged between the two light-emitting LEDs 6; the lamp holder 5 is provided with a cover plate 2 on top, and the cover plate 2 is provided with a transparent window 4 at a position corresponding to the light emitting LED6.
The lower part of the lamp holder 5 is provided with a larger space, and the bottom plate is provided with a small hole, so that the installation of wiring, sensors and the like is convenient. The light emitting LED6 is mounted directly in the hole site of the lamp holder. The two sides of the lamp holder central trapezoid table are provided with luminous panels 7. The reflector plate can limit the signal emission angle and direction, so that the overall structure is buried without protruding, frequent collision and extrusion of the device by a vehicle can be avoided, and maintenance and repair cost is reduced. The stainless steel cover plate 2 is directly arranged on the lamp holder, and the stainless steel panel, the lamp holder and the embedded part are directly connected through the fixing screw. The transparent window 4 is a glass panel and is stuck to the H-shaped blank of the stainless steel cover plate through glass cement.
The embedded parts are shared, are positioned at the bottommost end of the part and serve as supporting parts, and serve as shells of the whole part to form a protective shell. The stainless steel cover plates share one and are directly arranged on the lamp holder. The four fixing screws are used for fixing the stainless steel panel, the lamp holder and the embedded part together. The two luminous LEDs are respectively positioned on two sides of the trapezoid table on the top surface of the lamp holder and are directly arranged in the hole site of the lamp holder. The reflecting panels are symmetrically adhered to the two sides of the trapezoid table. The glass panels used as transparent windows are two in number, and are directly adhered to the clearance of the H-shaped stainless steel panel through glass cement.
Working process and working principle: the device is installed on a road where a road ground mark line is located when in use. When in operation, road information is acquired through external data and an on-site sensor (arranged in a lamp or on the back side of a guideboard, and the like), and after simple processing, the singlechip gives an updated signal lamp lighting scheme. The driving direction of one lane is changed through the three stages of an initial state, a conversion state and an end state. And gives a reminder of the turning direction and other parts by matching with other traffic indicating devices.
In this embodiment, the directions of the lamp sections a (going side) and B (coming side) are opposite, and the directions are respectively directed to the driving directions of only going side visible and only coming side visible. As shown in fig. 5, the initial state refers to the lighting scheme of the driving indicator lamps in all directions of the original road: and the red light on the side A and the red light on the side B are used as boundaries. And taking the green light on the side A and the red light on the side B as the luminous states of going into the lane. And the green light on the side B and the red light on the side A are used as luminous states in the lane.
As shown in fig. 6, the change state refers to a lighting scheme for changing the lane when the congestion condition of the lane is obviously severe relative to another lane, and the ratio of the congestion coefficients exceeds the threshold value range: taking severe congestion as an example, the boundary is kept with the red light on the A side and the red light on the B side. The red light on the side A and the red light on the side B turn into yellow light to flash, which means that the vehicle should be driven away as soon as possible to vacate a lane. The vehicle goes to the lane to keep the light-emitting state of the green light on the side A and the red light on the side B.
As shown in fig. 7, the ending state refers to a lighting scheme of the underground lamp signaling device when the road is changed for a period of time and the lane is vacated to be in no-vehicle traffic: as described in the result, the boundary of the red light on the side A and the red light on the side B is moved leftwards by one lane, namely, the flashing lamps of the red light on the side A and the yellow light on the side B are used as new boundaries, and the original boundary is jumped to the luminous states of the green light on the side A and the red light on the side B. The other lane keeps the light-emitting state of the green light on the B side and the red light on the A side.
In addition, the control part of the device adopts an infrared photoelectric sensor based on the programming of SCM such as STC89C51/52, STM32 and the like to assist in monitoring the form condition of the vehicle on the lane. The infrared photoelectric sensor is used for assisting in monitoring the form condition of the vehicle on the lane, so that unnecessary electric energy consumption is reduced. The infrared photoelectric sensor can effectively avoid errors caused by interference factors such as natural wind, has strong light interference resistance, and can play an effective train positioning role in a subway tunnel with a complex light environment.
When in operation, road information is acquired through external data and an on-site sensor (arranged in a lamp or on the back side of a guideboard, and the like), and after simple processing, the singlechip gives an updated signal lamp lighting scheme. The driving direction of one lane is changed through the three stages of an initial state, a conversion state and an end state. The control method comprises the following steps:
step 1: detecting traffic flow information in real time, and calculating a congestion ratio R:
calculating the congestion coefficient of the unidirectional lane as C:
C＝k 1 p+k 2 q
wherein k is 1 、k 2 Is a weight coefficient; p is the current road section lane occupancy, q is the current road section speed utilization, andv is the average running speed of the vehicle at the current road section, and V is the speed limit of the vehicle at the current road section; the congestion ratio R is:
wherein C is 1 C is a traffic jam coefficient of a certain direction lane 2 Congestion coefficients for its subtended lanes;
step 2: judging according to the congestion ratio R: if the congestion ratio R exceeds the preset value, jumping to the step 5, otherwise, entering the step 3;
step 3: judging whether the lane is changed; if yes, jumping to the step 5; otherwise, entering a step 4;
step 4: keeping the lane unchanged, and ending the lane change;
step 5: ready to enter a lane change state: acquiring Fang Lukou traffic light information before a lane to be changed, and judging whether the current traffic light is in a red light or yellow light stage; if yes, jumping to the step 7, otherwise, entering the step 6;
step 6: after the traffic light enters a red light stage, jumping to the step 5;
step 7: after the traffic light enters a green light stage, controlling a current incoming side light emitting LED of a buried signal lamp on a lane line at the right side of the current vehicle direction of a lane to be changed to enter a yellow light warning stage;
step 8: judging whether the current traffic light is at the moment of entering the green light stage, and whether the vehicle is not detected in the zone to be changed of the lane; if yes, jumping to the step 10, otherwise, entering the step 9;
step 9: controlling the yellow light warning stage to at least keep until the arrival moment of the green light stage of the next traffic light, and then jumping to the step 8;
step 10: and controlling the light-emitting LED entering the yellow light warning stage to be changed into a red light, and controlling the light-emitting LED on the current coming vehicle side of the buried signal lamp on the lane line on the other side of the lane to be changed into a green light, so that the lane change is completed.
Claims (1)
1. A control method of a dynamic road traffic signal control system adopts a control system comprising a signal receiving and processing circuit (9) and a signal lamp control and energy circuit (10); the signal receiving and processing circuit (9) comprises a filter capacitor C1, a detection module SIP4, a pin expansion and relay module and a 52 single chip microcomputer U1; the filter capacitor C1 is connected in parallel with two ends of a direct current stabilized voltage supply for supplying power to the detection module SIP4, the pin expansion and relay module and the 52 singlechip U1; SDA and SCl pins of the detection module SIP4 are respectively connected with P2B1 and P2B2 pins of the 52 single chip microcomputer U1, so that detection signals and control signals are output; SER, RCLK and SCl pins of the pin expansion and relay module are respectively connected with P3B4, P3B5 and P3B6 pins of the 52 single chip microcomputer U1; the signal lamp control and energy circuit (10) comprises a plurality of signal lamp branches, one end of a current limiting resistor R of each signal lamp branch is connected with a power supply VCC, the other end of the current limiting resistor R is connected with the positive end of a light emitting LED (6), and the negative end of the light emitting LED (6) is connected with the drain electrode d of an N-channel enhanced MOS tube Q; the source electrode s of the N channel enhancement type MOS tube Q is grounded, and the grid electrode g is connected with the QA pin of the pin expansion and relay module in the signal receiving and processing circuit (9); the luminous LEDs (6) in each signal lamp branch are arranged in buried signal lamps, and a plurality of buried signal lamps are buried on each lane line; the coming side and the going side of each buried signal lamp are respectively provided with a luminous LED (6) which is visible only by a one-way coming vehicle; the embedded signal lamp is characterized in that an embedded part (1) is arranged at the lower part of the embedded signal lamp, the bottom end of the embedded part (1) is embedded in the ground, a lamp holder (5) is arranged at the top end of the embedded part, two light-emitting LEDs (6) are arranged on the lamp holder (5), and a trapezoid table (11) for isolating light is arranged between the two light-emitting LEDs (6); the top of the lamp holder (5) is provided with a cover plate (2), and the cover plate (2) is provided with a transparent window (4) at a position corresponding to the luminous LED (6); both sides of the trapezoid table (11) are provided with light reflecting panels (7); the cover plate (2), the lamp holder (5) and the embedded part (1) are fixedly connected through the fixing screw (3); the method is characterized by comprising the following steps of:
step 1: detecting traffic flow information in real time, and calculating a congestion ratio R:
calculating the congestion coefficient of the unidirectional lane as C:
C＝k 1 p+k 2 q
wherein k is 1 、k 2 Is a weight coefficient; p is the current road section lane occupancy, q is the current road section speed utilization, and
v is the average running speed of the vehicle at the current road section, and V is the speed limit of the vehicle at the current road section; the congestion ratio R is:
wherein C is 1 C is a traffic jam coefficient of a certain direction lane 2 Congestion coefficients for its subtended lanes;
step 2: judging according to the congestion ratio R: if the congestion ratio R exceeds the preset value, jumping to the step 5, otherwise, entering the step 3;
step 3: judging whether the lane is changed; if yes, jumping to the step 5; otherwise, entering a step 4;
step 4: keeping the lane unchanged, and ending the lane change;
step 5: ready to enter a lane change state: acquiring Fang Lukou traffic light information before a lane to be changed, and judging whether the current traffic light is in a red light or yellow light stage; if yes, jumping to the step 7, otherwise, entering the step 6;
step 6: after the traffic light enters a red light stage, jumping to the step 5;
step 7: after the traffic light enters a green light stage, controlling a current incoming side light emitting LED of a buried signal lamp on a lane line at the right side of the current vehicle direction of a lane to be changed to enter a yellow light warning stage;
step 8: judging whether the current traffic light is at the moment of entering the green light stage, and whether the vehicle is not detected in the zone to be changed of the lane; if yes, jumping to the step 10, otherwise, entering the step 9;
step 9: controlling the yellow light warning stage to at least keep until the arrival moment of the green light stage of the next traffic light, and then jumping to the step 8;
step 10: and controlling the light-emitting LED entering the yellow light warning stage to be changed into a red light, and controlling the light-emitting LED on the current coming vehicle side of the buried signal lamp on the lane line on the other side of the lane to be changed into a green light, so that the lane change is completed.
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| CN201378364Y (en) * | 2009-04-03 | 2010-01-06 | 高珅 | Traffic flow control system |
| CN106284025A (en) * | 2016-11-07 | 2017-01-04 | 成康宁 | Road traffic control system based on underground lamp |
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