CN106297332A - A kind of intelligent traffic control system based on pressure transducer - Google Patents

Abstract

The present invention relates to the field of intelligent transportation, in particular to an intelligent traffic control system based on pressure sensors. Multiple sets of sensor arrays are laid on the lanes of intersections. Sensors, the lateral distance between adjacent pressure sensors is b, the longitudinal distance is a, the distance between the sensor array and the white line on one side of the lane is 4b, and the distance from the white line on the other side of the lane is 7b; the adjacent sensor array The distance between them is 16a; where a=1.4b~1.6b, where b=0.2m~0.3m. The present invention detects the number of waiting vehicles on a lane by the pressure sensor laid on the lane, and the signal light controller controls the passing time of the traffic lights according to the number of waiting vehicles on each lane, which greatly improves the circulation speed of vehicles at the intersection and eases the traffic. pressure.

Description

An Intelligent Traffic Control System Based on Pressure Sensor

technical field

The invention relates to the field of intelligent traffic, in particular to a pressure sensor-based intelligent traffic control system that detects the number of vehicles on a lane by a pressure sensor to adjust the time of traffic lights to maximize vehicle mobility at intersections.

Background technique

With the continuous improvement of people's living standards, the per capita ownership of vehicles has increased significantly, and orderly traffic must have traffic control. It is imperative to give priority to the green light in the direction with more traffic and improve the traffic capacity of the road, so the intelligent traffic control device is very important. At present, statistical traffic control is practical, that is, to distinguish main roads and secondary arterial roads according to the average traffic volume in the north-south direction and east-west direction, adopt the principle of long green light time on main roads to set the on-time of traffic lights, and adopt the principle of equal cycle for the case of all main roads; For busy intersections, extend the green light time, and shorten the green light time at night. For a newly built road with several traffic lights, the phase difference principle is used to let some vehicles go straight to the green light, which is called green wave control, which extends from point control to line control and even surface control. At the main intersections of the city, pressure sensors are often buried within a few meters together with illegal photos to urge drivers to obey the traffic rules. This is the initial stage of realizing intelligent transportation. Intelligent transportation also needs to adjust the time when traffic lights are on according to the number of perceived vehicles.

Contents of the invention

Aiming at the problem in the prior art that the passing time of traffic lights cannot be intelligently adjusted according to the number of waiting vehicles, the invention researches and designs an intelligent traffic control system based on a pressure sensor.

The technical scheme adopted in the present invention is:

A pressure sensor-based intelligent traffic control system is characterized in that multiple sets of sensor arrays are laid on the lanes of the intersection, and each set of sensor arrays includes 64 pressure sensors in a matrix of 8 rows × 8 columns, and the pressure sensor 1 The sensing area of is a rectangular area with horizontal length b and vertical length a. The lateral distance between adjacent pressure sensors is b, the longitudinal distance is a, the distance between the sensor array and the white line on one side of the lane is 4b, and the distance from the white line on the other side of the lane is 7b; The distance between the sensor arrays is 16a; where a=1.4b~1.6b, where b=0.2m~0.3m.

Further, a=1.5b.

Further, b=0.2m.

Further, each lane has 13 sets of sensor arrays.

Further, the first group of sensor arrays is laid backward from the distance from the red light line 8a.

Further, the sensing area of the pressure sensor is a rectangular area formed by the horizontal direction b and the vertical direction a.

Further, the intelligent traffic control system also includes a signal light controller, each of the pressure sensors is electrically connected to the signal light controller, and the signal light controller analyzes the information collected by the pressure sensor and controls the turning on of the traffic light time.

Further, pressure sensors are provided on the straight lane and the left turn lane.

Further, the pressure sensor is a Fabry-Perot (F-P) optical fiber pressure sensor.

Furthermore, pressure sensors are provided on the through lane and the left turn lane.

Compared with the prior art, the beneficial effect that the present invention has obviously is: according to the traffic light crossing of traffic jam mostly is the characteristic of small family car, paving Fabry-Perot (F-P) for the specification design of the tire of small family car Type optical fiber pressure sensor, any wheel of the vehicle can stay stably for at least two seconds after pressing on any pressure sensor, and can detect the number of vehicles waiting in a lane, and the signal light controller controls the traffic lights according to the number of vehicles waiting in each lane The passing time has greatly improved the circulation speed of vehicles at intersections and relieved traffic pressure.

Description of drawings

Figure 1 is a schematic diagram of the position of each wheel of the vehicle when a pressure sensor can sense the wheel pressure;

Fig. 2 is an enlarged view of part A in Fig. 1;

Fig. 3 is a schematic diagram of the position of each wheel of the vehicle when eight pressure sensors arranged horizontally can sense the vehicle;

Fig. 4 is a schematic diagram of a sensor array in an embodiment of the present invention;

Fig. 5 is a schematic diagram of an intelligent traffic control system according to an embodiment of the present invention.

In the figure, 1. Pressure sensor, 2. Sensor array, 3. Right-turn lane in north-south direction, 4. Straight lane in north-south direction, 5. Left-turn lane in north-south direction, 6. Right-turn lane in east-west direction, 7. Straight lane in east-west direction , 8, east-west direction left-turn lane, 9, signal light controller, 10, traffic light display device, 11, power supply, 12, wheel.

detailed description

In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In the description of the present invention, unless otherwise specified, "plurality" means two or more.

As shown in Figure 1, a mathematical model is established for the lane, and the horizontal and vertical distances of the lane are respectively set with squares at distances b and a, and the horizontal direction of the lane is divided into 18 parts. Also take 19 grid points to illustrate the pressure sensor 1. The pressure sensor 1 is a Brie-Perot F-P optical fiber pressure sensor. Specifically, the center of the pressure sensor 1 is set at the a9, b9 grid point coordinates, combined with Figure 2 , the a×b area area centered on a9 and b9 is the sensing area of the pressure sensor 1, generally a=1.4b～1.6b, preferably a=1.5b, in this embodiment, a=0.3m, b=0.2m.

Set the width of the city lane as 3.6m, the general width direction of the wheel 12 is 0.2m, the length direction is 0.3m, the distance between the left and right wheels of the vehicle is 1.6m, and the distance between the front and rear wheels is 2.4 meters.

Referring to Fig. 1, the four wheels 12 of the vehicle are respectively in [a1, b1, a1, b9, a9, b1, a9, b9], [a1, b9, a1, b17, a9, b9, a9, b17], [a9 , b1, a9, b9, a17, b1, a17, b9] and [a9, b9, a9, b17, a17, b9, a17, b17] positions can all be sensed.

As a more preferred embodiment, assuming that the safety distance of a car occupies 6m (the length direction of the lane), 15 cars are 90m, and the detectable longitudinal length of each group of sensor arrays 2 is 7.2m, then it can be deduced that if the vehicle is to detect Whether there are 15 or more vehicles on the lane, 13 sets of sensor arrays 2 with 8 rows and 8 columns are required.

As shown in Figure 3, the pressure sensor 1 is respectively set at a9, b8, a9, b9, a9, b10, a9, b11, a9, b12, a9, b13, a9, b14, a9, b15. It can be seen that the On the premise that the vehicle is driving in the lane, when the rear wheel of the vehicle is pressed on any grid point of row a1, the front wheel can be sensed by the pressure sensor 1 on row a9; on the premise of ensuring that the vehicle is driving in the lane, the vehicle When the front wheel of the vehicle is pressed to any grid point on row a17, the rear wheel of the vehicle can be sensed by the pressure sensor 1 arranged on row a9.

Similarly, if pressure sensor 1 is set on a10, b8, a10, b9, a10, b10, a10, b11, a10, b12, a10, b13, a10, b14, a10, b15, then the vehicle is guaranteed to be in the lane Under the premise of driving, when the rear wheels of the vehicle are pressed on any grid point of row a2, the front wheels can be sensed by the pressure sensor 1 on row a10; At any grid point on row a18, the rear wheels of the vehicle can be sensed by the pressure sensor 1 set on row a10.

By analogy, as shown in Figure 4, if the pressure sensors 1 are buried on the roadway in the form of 8 rows × 8 columns to form a sensor array 2, the lateral distance between adjacent pressure sensors 1 is b, and the vertical distance is a. The distance between the array 2 and the white line on one side of the lane is 4b, and the distance from the white line on the other side of the lane is 7b; multiple sets of sensor arrays 2 are laid on the lane, and the distance between adjacent sensor arrays 2 is 16a. The first group of pressure sensors 1 is laid backward from the distance from the red light line 8a.

The pressure sensor 1 adopts the Fabry-Perot F-P optical fiber pressure sensor. Its working principle is that when one end of the Fabry-Perot F-P optical fiber pressure sensor 1 is pressed, its metal surface is pressed down, thereby changing the Fabry-Perot F-P optical fiber pressure sensor. The distance between the two reflecting mirrors of the R-Perot interferometer changes the optical information at the other end of the optical fiber, that is, the situation of vehicles waiting can be perceived.

Assuming that the safe distance of a vehicle occupies 6m, 15 vehicles is 90m, and the detectable longitudinal length of each sensor array 2 is 7.2m, it can be deduced that 13 sets of sensors are required to detect whether the lane reaches or exceeds 15 vehicles. A sensor array 2 of 8 rows by 8 columns.

As another embodiment that uses fewer pressure sensors 1, 12 sets of sensor arrays 2 with 8 rows x 8 columns are laid, and the thirteenth set of pressure sensors 1 with 4 rows x 8 columns can be laid (it is worth noting that in Fig. 4 For the clarity of the diagram, only 6 sets of pressure sensors with 8 rows and 8 columns are drawn in each track, but there are actually 12 sets of pressure sensors with 8 rows and 8 columns, plus the last set of pressure sensors with 4 rows and 8 columns) .

Specifically, as shown in FIG. 5 , pressure sensors 1 are laid on the north-south straight lane 4 , the north-south left-turn lane 5 , the east-west straight lane 7 and the east-west left-turn lane 8 in the manner described above. On the right-turning lane 3 and the east-west direction right-turning lane 6, you can turn directly and do not need to wait for the green light without laying the pressure sensor 11.

Each pressure sensor 1 is connected to the signal light controller 9, and the signal light controller 9 judges the number of vehicles waiting in the north-south direction and the east-west direction according to the signal collected by the pressure sensor 1, and then adjusts the display time of the traffic light to be displayed by the traffic light display device 10.

The power supply 11 provides energy for the traffic light display device 10 , the signal light controller 9 and the pressure sensor 1 .

For the convenience of understanding, the following specific traffic light adjustment methods are given below:

In order to simplify the control method, in fact, the group of pressure sensor arrays 1 farthest from the traffic lights can also be used as a reference for judging whether the vehicle exceeds the threshold, that is, if a vehicle is pressed on the last group of sensor arrays 2 and stabilized for at least two seconds, Then it is determined that there are too many vehicles waiting in this lane, and it may be considered to prolong the time for the green light to pass through this lane. In order to determine more accurately whether the vehicles pressing on the last group of sensor arrays 2 stay due to too many vehicles in front, it can be judged as much as possible whether the sensing area of the previous group or multiple groups of sensor arrays 2 also has vehicles staying stably.

The above-mentioned ideal embodiment according to the present invention is an inspiration. Through the above-mentioned description, relevant workers can make various changes and modifications within the scope of not departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, but must be determined according to the scope of the claims.

Claims (9)

1. A pressure sensor-based intelligent traffic control system is characterized in that multiple groups of sensor arrays (2) are laid on the lanes at intersections, and each group of sensor arrays (2) includes 8 rows × 8 columns that are distributed in a matrix. 64 pressure sensors (1), the lateral distance between adjacent pressure sensors (1) is b, the longitudinal distance is a, the distance between the sensor array (2) and the white line on one side of the lane is 4b, and the distance between the other side of the lane is 4b. The distance between the white lines on one side is 7b; the distance between adjacent sensor arrays (2) is 16a; where a=1.4b~1.6b, where b=0.2m~0.3m. 2. The pressure sensor-based intelligent traffic control system according to claim 1, characterized in that a=1.5b. 3. The pressure sensor-based intelligent traffic control system according to claim 2, characterized in that b=0.2m. 4. The pressure sensor-based intelligent traffic control system according to any one of claims 1-3, characterized in that each lane has 13 sensor arrays (2). 5. The pressure sensor-based intelligent traffic control system according to claim 4, characterized in that the first group of sensor arrays (2) is laid backward from the red light line 8a. 6. The pressure sensor-based intelligent traffic control system according to claim 1, characterized in that, the sensing area of the pressure sensor (1) is a rectangular area with a horizontal length of b and a longitudinal length of a. 7. The pressure sensor-based intelligent traffic control system according to claim 1, characterized in that, the intelligent traffic control system also includes a signal light controller (9), each of the pressure sensors (1) is connected to the The signal lamp controller (9) is electrically connected, and the signal lamp controller (9) analyzes the information collected by the pressure sensor (1), and controls the lighting time of the traffic lights. 8. The pressure sensor-based intelligent traffic control system according to claim 1, characterized in that pressure sensors (1) are set on the straight lane and the left-turn lane. 9. The pressure sensor-based intelligent traffic control system according to claim 1, characterized in that, the pressure sensor (1) is a Fabry-Perot (F-P) optical fiber pressure sensor.