Urban traffic safety lighting system

Abstract

The invention relates to the technical field of novel lighting, in particular to an urban traffic safety lighting system, which comprises a traffic flow acquisition module used for acquiring the traffic flow monitored by each mother lamp in real time in a road lighting system and the actual power of each mother lamp during working; the mother lamp association module is used for determining each inflow mother lamp corresponding to any mother lamp and calculating the average consumed time of the vehicle; the street lamp power adjusting module is used for adjusting the power of the lighting street lamp in real time by predicting the traffic flow of the road where the mother lamp is located, and comprises the steps of determining the intersection shunting weight, obtaining a shunting weight vector, estimating a road traffic flow vector and estimating a traffic flow density vector; and determining the lowest illumination power, the target power and the power adjustment speed, and adjusting the power of the illumination street lamp. The power of the lighting street lamp is adjusted through the real-time traffic flow, the situation that the lighting power change amplitude is too large due to sudden change of the traffic flow is avoided, visual fatigue of a driver is reduced, and traffic safety is enhanced.

Description

Technical Field

[0001] The present application relates to the field of novel lighting technology, and in particular to an urban traffic safety lighting system. Background Art

[0002] With the acceleration of urbanization, the number of urban street lamps has increased rapidly, and the power consumption has increased rapidly. Therefore, a lighting management system is needed to manage street lamps, reduce street lamp energy consumption, and improve road safety and lighting efficiency. The traffic volume on the road at night shows a significant timeliness characteristic, that is, the traffic volume is large in certain time periods, and high-brightness lighting conditions are required to provide drivers with sufficient road details; the traffic volume is small in certain time periods, and the lighting brightness can be reduced to achieve energy-saving and environmental protection effects.

[0003] The existing method monitors the vehicles at the intersection in real time, determines the volume of traffic entering the road, and then adjusts the power of the lighting street lamps in real time to achieve energy saving and environmental protection. In the traditional urban traffic lighting system, the control of the brightness of the street lamps usually depends on the real-time traffic flow to adjust the lighting brightness. This method will respond frequently to changes in traffic conditions, and the adjustment range of the lighting street lamps is too large, which will cause additional stress and wear on the electrical components of the street lamps, resulting in a shortened service life of the street lamps. Secondly, this frequent brightness change may cause visual interference to the driver, increase visual fatigue, and thus create hidden dangers to urban traffic safety. Therefore, the traditional urban traffic safety lighting system has the problem of unreasonable control of street lamp brightness, which will lead to a decrease in the life of the street lamps, cause visual interference to the driver, and thus affect road traffic safety. Summary of the invention

[0004] In order to solve the above technical problems, a city traffic safety lighting system is provided to solve the existing problems.

[0005] The solution to the technical problem of the present application is to provide an urban traffic safety lighting system, the system comprising:

[0006] The vehicle flow collection module is used to collect the vehicle flow monitored in real time by each mother lamp in the road lighting system, as well as the actual power of each mother lamp when it is working;

[0007] The mother lamp association module is used to determine the inflow mother lamp corresponding to each mother lamp through the flow path of the vehicle between the mother lamps, and calculate the average time consumed by the vehicle according to the average time of multiple vehicles traveling between each inflow mother lamp of any mother lamp and any mother lamp thereof;

[0008] The street lamp power adjustment module is used to adjust the power of the lighting street lamp in real time by predicting the traffic flow of the road where the mother lamp is located, including:

[0009] (1) determining the intersection diversion weight of any mother light at each moment by the proportion of the traffic flow of any mother light at each moment to the traffic flow of all the mother lights flowing into it, and constructing a diversion weight vector for each mother light based on the intersection diversion weight of each mother light at all moments in multiple days;

[0010] (2) Analyze the changes in the traffic volume of all the inflowing mother lights corresponding to each mother light in the local time period before the current moment, and the elements in the diversion weight vector at the corresponding moment, determine the estimated road traffic flow vector of each mother light at the next moment corresponding to the current moment, obtain the estimated road traffic flow vector of each mother light at multiple moments after the current moment through multiple iterative calculations, and obtain the estimated traffic flow density vector of each mother light at the current moment based on the average level of the elements in the estimated road traffic flow vector of each mother light at all moments after the current moment;

[0011] (3) Determine the minimum lighting power corresponding to each element in the estimated traffic density vector based on the estimated traffic conditions of each element in the estimated traffic density vector and the power range of the lighting street lamps; determine the target power of each mother lamp at the next moment based on the minimum lighting power; determine the power adjustment speed of each mother lamp at the current moment based on the actual power and the target power, and adjust the power of the lighting street lamps.

[0012] Preferably, the determining of the inflow mother lamp corresponding to each mother lamp includes: if the vehicle can travel from the starting mother lamp to any of the mother lamps without passing through other mother lamps, then determining the starting mother lamp as the inflow mother lamp corresponding to any of the mother lamps.

[0013] Preferably, the intersection diversion weight of any mother lamp at each time includes:

[0014] The difference between the average time taken by any vehicle flowing into the mother light corresponding to each mother light at each moment is recorded as a specific moment; the traffic flow of any vehicle flowing into the mother light at the specific moment is taken as the basic traffic flow of any vehicle flowing into the mother light;

[0015] The sum of all the basic traffic flows corresponding to each mother light at each moment and flowing into the mother light is taken as the total basic traffic flow of each mother light at each moment;

[0016] The ratio of the traffic flow of each mother light at each moment to the total basic traffic flow is used as the intersection diversion weight of each mother light at each moment.

[0017] Preferably, the method for constructing the shunt weight vector of each mother lamp is:

[0018] The intersection traffic flow vector of each mother light at each time of the day is formed by dividing the traffic flow weight of the intersection of each mother light at all times of the day;

[0019] The mean of the elements of the same dimension in the traffic flow vectors of the intersection for each mother light on multiple days is calculated to form the diversion weight vector of each mother light.

[0020] Preferably, the step of determining the estimated road traffic flow vector at a subsequent moment corresponding to each mother lamp at the current moment includes:

[0021] The average of the average time taken by the vehicle to travel from any mother light without passing through other mother lights to all other mother lights is taken as the road section time taken by the any mother light;

[0022] The traffic flow of any mother light at each moment within the time taken by the road section before the current moment is used to form a road traffic flow vector of any mother light at the current moment;

[0023] The first element in the road traffic flow vector of any incoming mother light at the current moment corresponding to each mother light is used as the estimated basic traffic flow of any incoming mother light at the current moment;

[0024] The sum of the estimated basic traffic flows corresponding to each mother light and flowing into the mother light at the current moment is used as the estimated total basic traffic flow of each mother light at the current moment;

[0025] Each element in the shunt weight vector of each mother lamp is recorded as the estimated shunt weight of each mother lamp at each moment;

[0026] The product of the estimated diversion weight of each mother light at the current moment and the estimated total basic traffic flow is used as the estimated number of inflow vehicles of each mother light at the next moment corresponding to the current moment; the first element in the road traffic flow vector of each mother light at the current moment is eliminated, and the estimated number of inflow vehicles is used as the last element in the road traffic flow vector to obtain the estimated road traffic flow vector of each mother light at the next moment corresponding to the current moment.

[0027] Preferably, obtaining the estimated road traffic flow vector of each mother lamp at multiple moments after the current moment includes:

[0028] Based on the estimated road traffic flow vector at a subsequent moment corresponding to the current moment of each mother lamp and the estimated diversion weight, the estimated road traffic flow vector at multiple moments after the current moment of each mother lamp is obtained through multiple iterative calculations.

[0029] Preferably, obtaining the estimated traffic density vector of each mother lamp at the current moment includes:

[0030] Calculate the mean of all elements in the estimated road traffic flow vector of each mother lamp at any time after the current time, and record it as the traffic flow density at any time;

[0031] The traffic density of each mother light at all moments after the current moment is combined to form an estimated traffic density vector of each mother light at the current moment.

[0032] Preferably, the method for calculating the minimum lighting power corresponding to each element in the estimated traffic density vector is:

[0033] Obtain the power range of the lighting street lamp during operation, and obtain the minimum power and the maximum power; and use the difference between the maximum power and the minimum power of the lighting street lamp as the power adjustment amount of the lighting street lamp;

[0034] The minimum lighting power P corresponding to the fth element in the estimated traffic density vector of the nth mother lamp at the current time t n,t,f The calculation method is: Wherein, LP is the minimum power of the lighting street lamp, HP is the maximum power of the lighting street lamp, CP is the power adjustment amount of the lighting street lamp, and ρ n,t,f is the fth element in the estimated traffic density vector of the nth mother light at the current time t, and min() is the minimum function.

[0035] Preferably, determining the target power of each mother lamp at a next moment at a current moment includes:

[0036] Counting the number of all elements in the estimated traffic density vector, and taking the ratio of the power adjustment amount to the number as the maximum power adjustment speed;

[0037] The minimum target power TP corresponding to the fth element in the estimated traffic density vector at time t+1 t+1,f The calculation method is: TP t+1,f =P n,t,f -V×(f-1), where P n,t,f is the minimum lighting power corresponding to the fth element in the estimated traffic density vector of the nth mother lamp at the current time t, V is the maximum power adjustment speed, and f is the position number corresponding to the element in the estimated traffic density vector;

[0038] The maximum value of the minimum target power corresponding to all elements in the estimated traffic density vector of each mother lamp at the current moment at the next moment is used as the target power of each mother lamp at the current moment at the next moment.

[0039] Preferably, the power adjustment speed of each mother lamp at the current moment is the rate of change between the actual power at the current moment and the target power at the next moment.

[0040] This application has at least the following beneficial effects:

[0041] The present application determines the various inflow mother lights corresponding to each mother light through the flow paths of vehicles between the mother lights. The beneficial effect of the application is that it reflects the path relationship between different mother lights, explains the flow trend of vehicles when driving, and calculates the average time consumed by vehicles according to the average time of multiple vehicles traveling between the various inflow mother lights and any of the mother lights. The beneficial effect of the application is that it takes into account the time consumed by vehicles traveling between two mother lights to reflect how long the traffic flow through each road where the inflow mother lights are located may flow into the road where any of the mother lights are located; the intersection diversion weight of each mother light at each moment is determined by the proportion of the traffic flow of each inflow mother light corresponding to any of the mother lights at each moment in the traffic flow of all the inflow mother lights. The beneficial effect of the application is that it takes the time consumed by vehicles traveling between two mother lights to reflect the time when the traffic flow through each road where the inflow mother lights are located may flow into the road where any of the mother lights are located. The method takes into account the proportion of all traffic flows flowing into the road where the mother light is located and finally flows into the road where any mother light is located, so as to reflect the possibility of other traffic flows flowing into the road where the mother light is located at this time merging into the road where any mother light is located; constructs the diversion weight vector of each mother light based on the intersection diversion weight of each mother light at all times in multiple days, which has the beneficial effect of taking into account the flow law of traffic on the road where the mother light is located in the historical period, so as to reflect the proportion of traffic diversion on the road where each mother light is located at each time in a day; analyzes the changes in traffic flows of all traffic flows flowing into the mother light corresponding to any mother light in the local time period before the current time, and the elements of the corresponding time in the diversion weight vector, and determines the estimated road traffic flow of each mother light at the next moment corresponding to the current moment. Vector, through multiple iterative calculations, the estimated road traffic vector of each mother lamp at multiple moments after the current moment is obtained, and the estimated traffic density vector of each mother lamp at the current moment is obtained based on the average level of the elements in the estimated road traffic vector of each mother lamp at all moments after the current moment. The beneficial effect is that the change of the traffic on the road where each mother lamp is located at subsequent moments is taken into account to predict the traffic situation on the road where the mother lamp is located within a period of time after the current moment. The estimated traffic density vector estimates the traffic on the road where the mother lamp is located by integrating the traffic situation of the surrounding roads, so that the power of the corresponding mother lamp can be adjusted according to the estimated traffic flow in the future, which expands the time scale of the road lighting system in monitoring traffic flow and leaves enough redundant time for the mother lamp. Adjusting the power of the lamp group helps to reduce the adjustment speed of the power of the lamp group; determining the minimum lighting power corresponding to each element in the estimated traffic density vector through the estimated traffic flow conditions of each element in the estimated traffic density vector and the power range of the lighting street lamp, which has the beneficial effect of clarifying the lighting conditions that the power of the lighting street lamp on the road where the mother lamp is located at a later moment should meet through the estimated traffic flow conditions; determining the target power of each mother lamp at the next moment at the current moment based on the minimum lighting power, which has the beneficial effect of determining the target power of each mother lamp at the next moment at the current moment if the power of the mother lamp at the next moment meets the lighting conditions, and under the condition that the power change amplitude of the lighting street lamp is not drastic, the power condition that the power of the lighting street lamp at the next moment at the current moment should reach, so that the lighting street lamp can complete the lighting task;Based on the difference between the actual power at the current moment and the target power, the power adjustment speed of each mother lamp at the current moment is determined, and the power of the lighting street lamp is adjusted. The beneficial effect is that the power of the lighting street lamp is adjusted according to the real-time traffic flow, avoiding the problem of excessive changes in lighting power caused by sudden changes in traffic flow, and at the same time, it can reduce the visual fatigue of the driver and enhance traffic safety. ; BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The following is a further detailed description of an urban traffic safety lighting system of the present application in conjunction with the accompanying drawings.

[0043] Figure 1 A block diagram of a city traffic safety lighting system provided by an embodiment of the present application;

[0044] Figure 2 A schematic diagram of a layout of a mother-and-child interactive street lamp provided in one embodiment of the present application;

[0045] Figure 3 A flowchart of the steps of a lighting lamp power module provided by one embodiment of the present application;

[0046] Figure 4 A flowchart of the steps of a method for obtaining the intersection diversion weight of each mother lamp provided in one embodiment of the present application. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of this application more clear, the following is a further detailed description of an urban traffic safety lighting system proposed in this application in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described here are only used to explain this application and are not used to limit this application.

[0048] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0049] See also Figure 1 , which shows a block diagram of a city traffic safety lighting system provided by an embodiment of the present application, the system includes: a vehicle flow collection module, a mother lamp association module, and a street lamp power adjustment module.

[0050] The vehicle flow collection module is used to collect the vehicle flow monitored in real time by each mother lamp in the road lighting system, as well as the real-time actual power of each mother lamp.

[0051] In the traffic road lighting system, the control of street lights is generally set according to the traffic flow. Therefore, the traffic flow can be monitored in real time according to the monitoring equipment on the road lights. In this embodiment, the arrangement structure of the road lights adopts a parent-child interactive street light layout. The schematic diagram of the parent-child interactive street light layout is shown in FIG. Figure 2 As shown, Figure 2 The figure shows the arrangement of street lights at a three-way intersection. If a road has one direction, it has one set of street lights; if a road has two directions, it has two sets of street lights. A set of street lights is usually divided into a front area, a main area, and a rear area. Usually, the first street light or the first few street lights at the entrance of a road constitute the front area. Figure 2 The A in the front area indicates the front area. The first street lamp after the front area A is the mother lamp, that is, Figure 2 The street lights in area B are the main lights, and all street lights behind the main lights are recorded as the rear area, that is, Figure 2 The C in it stands for the rear area. Except for the main lamp, the rest are sub-lamps for lighting only. The main lamp is equipped with a special traffic flow monitoring device to monitor the number of vehicles passing through in a period of time in real time. The monitoring equipment on the main lamp transmits the monitored traffic flow to the traffic road lighting system.

[0052] Therefore, there are N mother lamps in the road lighting system, which transmit the traffic flow to the road lighting system every T time, and obtain the traffic flow monitored by each mother lamp at each moment.

[0053] In the road lighting system, the luminous power of each mother lamp is monitored in real time to obtain the actual power of each mother lamp at each moment;

[0054] Preferably, in this example, there are 800 mother lamps in the road lighting system, and each mother lamp sends traffic flow to the road lighting system once every 1 minute, indicating the total number of vehicles entering the road on that side within 1 minute. As other implementation methods, the implementer can set them according to the actual situation.

[0055] At this point, the traffic volume and actual power monitored by each mother lamp at each moment are obtained.

[0056] The mother lamp association module is used to determine the inflow mother lamp corresponding to each mother lamp through the flow path of the vehicle between the mother lamps, and calculate the average vehicle travel time based on the average time of multiple vehicles traveling between each inflow mother lamp of any mother lamp and any of the mother lamps.

[0057] If a vehicle does not need to pass other mother lights when traveling from the nth mother light to the mth mother light, then there is a road R directly connecting the nth mother light and the mth mother light. n→m , if a vehicle needs to pass through multiple mother lights when traveling from the nth mother light to the mth mother light, there is no direct road connecting the nth mother light to the mth mother light. Therefore:

[0058] If the vehicle can travel from the starting mother lamp to any mother lamp without passing through other mother lamps, the starting mother lamp is determined as the incoming mother lamp corresponding to any mother lamp, so that any mother lamp has multiple incoming mother lamps;

[0059] It should be noted that, assuming that the vehicle does not need to pass through other mother lamps when traveling from the nth mother lamp to the mth mother lamp, the nth mother lamp is the inflow mother lamp of the mth mother lamp.

[0060] The average time taken by multiple vehicles to travel from each inflow mother light to any mother light is recorded as the average vehicle time;

[0061] It should be noted that the average vehicle time is calculated by technicians when they are building a road lighting system based on historical vehicle driving data, and the average vehicle time is imported into the road lighting system in the form of external data.

[0062] It should be noted that there is no direct path between the nth mother lamp and itself, that is, there is no R n→n Even if the vehicle makes a U-turn and enters the other side of the road, it will not be detected by the nth mother light. It can be regarded as a vehicle reaching the destination on the road where the nth mother light is located and leaving the traffic flow. At the same time, a vehicle enters the road on the opposite side of the nth mother light and starts to join the traffic flow.

[0063] It should be noted that for a two-way road, there are respective mother lights on both sides of the road, so the traffic flow measured by the nth mother light is directional, so there is a road R directly connected between the nth mother light and the mth mother light. n→m When m→n .

[0064] At this point, each inflow mother lamp corresponding to each mother lamp, and the average time consumed by vehicles between each inflow mother lamp corresponding to any mother lamp and the any mother lamp are obtained.

[0065] The lighting lamp power module is used to adjust the power of the lighting street lamp in real time by predicting the traffic flow of the road where the mother lamp is located. The step flow chart of the lighting lamp power module provided in this application is as follows Figure 3 shown.

[0066] Step 1: Determine the intersection diversion weight of any mother light at each moment by the proportion of the traffic flow of any mother light at each moment in all the traffic flows flowing into the mother lights, and construct a diversion weight vector for each mother light based on the intersection diversion weight of each mother light at all moments in multiple days.

[0067] In the traditional lighting system control method, the power of the lighting street lamps is adjusted by real-time monitoring of the traffic volume entering the road. When the traffic volume changes greatly, the power adjustment speed of the lighting street lamps will be too fast. The more drastic the change in the brightness of the lighting street lamps, the more likely it is to cause visual fatigue to the driver, which will bring safety hazards. Therefore, this embodiment estimates the traffic volume that is about to enter the street lamp area, and leaves enough buffer time for the power adjustment of the lighting street lamps through the estimated traffic volume, thereby reducing the power adjustment speed of the lighting street lamps.

[0068] There is a clear correlation between the traffic flows of various roads in urban traffic, and this correlation is reflected by the traffic flow distribution at the intersection. Therefore, by analyzing the traffic flow diversion at the intersection, the intersection diversion weight of each mother light is determined to reflect the degree to which the traffic flow of other sections converges to the section where the corresponding mother light is located. The step flow chart of the method for obtaining the intersection diversion weight of each mother light provided in this application is as follows: Figure 4 As shown, specifically including:

[0069] The difference between each moment and the average time taken by any vehicle flowing into the mother light corresponding to each mother light is recorded as a specific moment;

[0070] The traffic flow of any of the inflow mother lights at a specific time is used as the basic traffic flow of any of the inflow mother lights;

[0071] It should be noted that, for ease of understanding, it is assumed that at time t0, the inflow mother lamps corresponding to the nth mother lamp are the g1th mother lamp, the g2th mother lamp, and the g3th mother lamp, respectively. Among them, the average time taken for a vehicle to flow from the g1th inflow mother lamp to the nth mother lamp is ct g1→n The average time taken for a vehicle to flow from the g2th inflow lamp to the nth inflow lamp is ct g2→n The average time taken for a vehicle to flow from the g3th inflow lamp to the nth inflow lamp is ct g3→n , the g1th flow into the mother lamp at t0-ct g1→n The traffic flow at the moment is used as the basic traffic flow of the g1th inflow into the mother light, indicating the g1th inflow into the mother light t0-ct g1→n The traffic at this time may pass through ct g1→n Then it arrives at the road where the nth mother light is located at time t0.

[0072] The sum of all the basic traffic flows corresponding to each mother light at each moment and flowing into the mother light is taken as the total basic traffic flow of each mother light at each moment;

[0073] The ratio of the traffic flow of each mother light at each moment to the total basic traffic flow is used as the intersection diversion weight of each mother light at each moment.

[0074] It should be noted that the total basic traffic flow represents all traffic flows that may flow into the road where each mother light is located. The larger the intersection diversion weight is, the more other traffic flows flowing into the road where the mother light is located tend to merge into the road where the corresponding mother light is located.

[0075] Furthermore, the intersection diversion weight reflects the flow characteristics of the traffic flow. The flow characteristics of the traffic flow on urban roads usually show certain regularities with daily and monthly cycles. Therefore, based on the intersection diversion weights at all times of the day, a diversion weight vector is constructed, specifically:

[0076] The intersection traffic flow vector of each mother light at each time of the day is formed by dividing the traffic flow weight of the intersection of each mother light at all times of the day;

[0077] Preferably, in this embodiment, the intersection diversion weight is calculated once every 1 minute, and there are 1440 intersection diversion weights at a total of time points in a day, so the length of the intersection traffic flow vector is 1440.

[0078] Calculate the mean of the elements of the same dimension in the traffic flow vectors of the intersection for each mother light on multiple days to form a diversion weight vector for each mother light;

[0079] Preferably, in this embodiment, the mean of the elements of the same dimension in the traffic flow vector of the intersection for each mother light for 30 days is calculated to form the diversion weight vector of each mother light.

[0080] It should be noted that the length of the diversion weight vector is also 1440. For ease of understanding, the 30 intersection traffic vectors corresponding to 30 days are scaled to 3, and the intersection traffic vector length 1440 is scaled to 3. Therefore, the three intersection traffic vectors are [α1, α2, α3], [β1, β2, β3], and [γ1, γ2, γ3], respectively. The diversion weight vector is The tth element in the diversion weight vector represents the diversion situation of traffic flow at the intersection of each mother lamp at time t.

[0081] At this point, the diversion weight vector of each mother lamp is obtained.

[0082] Step 2, analyze the changes in traffic volume of all the inflow mother lights corresponding to any mother light in the local time period before the current moment, and the elements in the diversion weight vector at the corresponding moment, determine the estimated road traffic flow vector of each mother light at the next moment corresponding to the current moment, and obtain the estimated road traffic flow vector of each mother light at multiple moments after the current moment through multiple iterative calculations, and obtain the estimated traffic flow density vector of each mother light at the current moment based on the average level of the elements in the estimated road traffic flow vector of all moments after the current moment.

[0083] Furthermore, based on the diversion weight vector, the traffic flow change after the current moment is estimated, specifically:

[0084] The average of the average time taken by the vehicle to travel from the nth mother light without passing through other mother lights to all other mother lights is taken as the road section time taken by the nth mother light;

[0085] The traffic flow of the nth mother light at each moment in the road section before the current moment is used to form a road traffic flow vector of the nth mother light at the current moment;

[0086] It should be noted that, assuming that the time taken for the nth mother light section is μT n , the nth mother lamp is μT before the current time t n The traffic flow at each moment in the time period is organized in chronological order to form the road traffic flow vector of the nth mother light at the current moment t. Assume that μT n =5, then the traffic flow at time t-5, time t-4, time t-3, time t-2, and time t-1 is combined to form the road traffic flow vector of the nth mother light at the current time t, which represents the vehicle distribution on the road where the nth mother light is located; where the length of the road traffic flow vector is μT n .

[0087] The first element in the road traffic flow vector of any incoming mother light at the current time t corresponding to the nth mother light is used as the estimated basic traffic flow of any incoming mother light at the current time t;

[0088] The sum of the estimated basic traffic flows corresponding to the n-th mother light and flowing into the mother light at the current time t is used as the estimated total basic traffic flow of the n-th mother light at the current time t;

[0089] It should be noted that the estimated total basic traffic flow reflects the estimated inflow of vehicles into the nth mother light at the current time t.

[0090] Each element in the diversion weight vector of the n-th mother lamp is recorded as the estimated diversion weight of the n-th mother lamp at each moment;

[0091] It should be noted that the tth element in the diversion weight vector represents the diversion of traffic at the intersection at the tth minute, corresponding to the tth moment of the day. Therefore, each element in the diversion weight vector of each mother lamp is the estimated diversion weight of each mother lamp at each moment.

[0092] The product of the estimated diversion weight of the n-th mother light at the current time t and the estimated total basic vehicle flow is used as the estimated number of vehicles flowing into the n-th mother light at the time t+1;

[0093] Eliminate the first element in the road traffic flow vector of the nth mother lamp at the current time t, take the estimated number of incoming vehicles as the last element in the road traffic flow vector, and obtain the estimated road traffic flow vector of the nth mother lamp at the time t+1;

[0094] It should be noted that, for the sake of ease of understanding, it is assumed that at the tth moment, the road traffic flow vectors of the g1th, g2th, and g3th inflows into the mother light corresponding to the nth mother light are [ω1,ω2,ω3,ω4,ω5], [e1,e2,e3,e4], and [h1,h2,h3,h4,h5,h6,h7] respectively, and ω1, e1, and h1 are used as the estimated basic traffic flows, and the sum of ω1, e1, and h1 is taken as As the estimated total basic traffic flow, the product of the estimated diversion weight of the nth mother light at the tth moment and the estimated total basic traffic flow is taken as the estimated number of vehicles flowing into the nth mother light at the t+1th moment, denoted as y. If the road traffic flow vector of the nth mother light at the tth moment is [q1, q2, q3, q4, q5, q6], then the estimated road traffic flow vector of the nth mother light at the t+1th moment is [q2, q3, q4, q5, q6, y].

[0095] It should be noted that the first element in the road traffic flow vector is removed, reflecting the vehicles that have left the section where the nth mother light is located at time t, and the newly added element represents the number of vehicles that have entered the section where the nth mother light is located at time t. Therefore, the estimated road traffic flow vector at time t+1 is the traffic flow distribution of the road at time t+1 estimated through simulation calculation.

[0096] Further, based on the estimated road traffic flow vector, the estimated road traffic flow vector at multiple moments after each moment is obtained through iterative calculation, specifically:

[0097] Through the above process, at the current time t, the estimated road traffic flow vector of the nth mother light at the time t+1 is obtained;

[0098] Based on the estimated road traffic flow vector of the nth mother light at time t+1, the estimated road traffic flow vector of each mother light at time t+2 is obtained through the estimated road traffic flow vector of any inflow mother light at time t+1 corresponding to the nth mother light and the t+1th element in the diversion weight vector of the nth mother light, and multiple iterative operations are performed in sequence to obtain the estimated road traffic flow vector of the nth mother light at multiple times after the current time t;

[0099] Preferably, in this embodiment, the estimated road traffic flow vector of the nth mother light 20 moments after the current moment t is obtained through iterative calculation; that is, 20 estimated road traffic flow vectors corresponding to the nth mother light within 20 minutes after the current moment t are obtained.

[0100] Calculate the mean of all elements in the estimated road traffic flow vector of the nth mother lamp at any time after the current time t, and record it as the traffic flow density at any time;

[0101] The traffic density of the nth mother light at all times after the current time t is used to form an estimated traffic density vector of the nth mother light at the current time t;

[0102] It should be noted that the estimated traffic density vector reflects the change in traffic density of the road where the nth mother light is located in the subsequent time, wherein the fth element in the estimated traffic density vector represents the traffic situation at time t+f.

[0103] At this point, the estimated traffic density vector of each mother light at the current moment is obtained.

[0104] Step 3, determine the minimum lighting power corresponding to each element in the estimated traffic density vector through the estimated traffic conditions of each element in the estimated traffic density vector and the power range of the lighting street lamps; based on the minimum lighting power, determine the target power of each mother lamp at the next moment at the current moment; based on the actual power and the target power, determine the power adjustment speed of each mother lamp at the current moment, and adjust the power of the lighting street lamps.

[0105] Furthermore, by estimating the traffic density vector to estimate the traffic conditions of the road in the next period of time, the power of the road lamp is adjusted so that the street lamp power can have enough time to adjust the power before the traffic arrives, thereby reducing the drastic degree of the power change of the lighting lamp. In this embodiment, the power is adjusted according to the adjustment rules of the traditional power adjustment method of the lighting street lamp. The traditional power adjustment rules are: when there are no vehicles on the road, the power of the lighting street lamp is at the lowest state, so that the lighting street lamp is at the minimum power; when the number of vehicles entering the road per minute reaches 10 or more, the lighting street lamp is at the maximum power.

[0106] Based on the above analysis, according to the estimated traffic density vector of each mother lamp, refer to the traditional power adjustment rules to obtain the minimum lighting power corresponding to each element in the estimated traffic density vector, specifically:

[0107] Obtain the power range of the street lamp during operation, and obtain the minimum power and maximum power;

[0108] The difference between the maximum power and the minimum power of the lighting street lamp is used as the power adjustment amount of the lighting street lamp;

[0109] The calculation method of the minimum lighting power corresponding to each element in the estimated traffic density vector of each mother lamp at the current moment is: Among them, P n,t,fis the minimum lighting power corresponding to the fth element in the estimated traffic density vector of the nth mother lamp at the current time t, LP is the minimum power of the lighting street lamp, HP is the maximum power of the lighting street lamp, CP is the power adjustment amount of the lighting street lamp, ρ n,t,f is the fth element in the estimated traffic density vector of the nth mother light at the current time t, and min() is the minimum function.

[0110] Preferably, in this embodiment, the street lamps on both sides of the road are LED lamps with a power range of 120W to 200W, then the minimum power LP of the street lamps is 120W, the maximum power HP of the street lamps is 200W, and the CP is 80W.

[0111] It should be noted that P n,t,f It indicates the lighting power that the nth mother lamp should meet at time t+f.

[0112] According to the traditional power adjustment rules, according to the vehicle estimation result of the estimated traffic density vector, the power of the lighting street lamp on the road where the nth mother lamp is located at time t+f should not be lower than the minimum lighting power P n,t,f , in order to complete the lighting task.

[0113] Furthermore, when adjusting the power of the lighting lamp, if the adjustment amplitude is too drastic, it will affect the service life of the lighting lamp and cause visual fatigue to the driver. Therefore, based on the power adjustment amount, the maximum power adjustment speed is determined, specifically:

[0114] Counting the number of all elements in the estimated traffic density vector, and taking the ratio of the power adjustment amount to the number as the maximum power adjustment speed;

[0115] It should be noted that if the adjustment range exceeds the maximum power adjustment speed, it will affect the service life of the lighting street lamp, cause visual fatigue to the driver, and affect driving safety.

[0116] Furthermore, in order to ensure that the mother lamp can reach the lighting demand at time t+f without exceeding the maximum power adjustment speed, the mother lamp should have a corresponding minimum target power at time t+1. If the lighting power of the mother lamp at time t+1 is lower than the minimum target power, even if the nth mother lamp increases the lighting power at the maximum power adjustment speed from time t+1 to time t+f, it cannot reach the minimum lighting power P at time t+f. n,t,f .

[0117] The calculation method of the minimum target power corresponding to the fth element in the estimated traffic density vector at time t+1 is: TP t+1,f =P n,t,f -V×(f-1), where TPt+1,f is the minimum target power corresponding to the fth element in the estimated traffic density vector at time t+1, P n,t,f is the minimum lighting power corresponding to the fth element in the estimated traffic density vector of the nth mother lamp at the current time t, V is the maximum power adjustment speed, and f is the position number corresponding to the element in the estimated traffic density vector.

[0118] It should be noted that V×(f-1) represents the maximum adjustment amount of the lighting lamp from time t+1 to time t+f at the maximum power adjustment speed, simulating that the nth mother lamp increases the lighting power at the maximum power adjustment speed from time t+1 to time t+f; subtracting the maximum adjustment amount from the minimum lighting power at time t+f gives the minimum target power at time t+1 corresponding to time t+f. If the lighting power of the nth mother lamp at time t+1 is less than the minimum target power, the nth mother lamp will not be able to reach the minimum lighting power corresponding to time t+f at time t+f.

[0119] The maximum value of the lowest target power corresponding to all elements in the estimated traffic density vector of the nth mother lamp at the current time t at the time t+1 is used as the target power of the nth mother lamp at the time t+1;

[0120] It should be noted that the estimated minimum target power corresponding to all elements in the traffic density vector is the minimum power requirement for the lighting power of the nth mother lamp at time t+1. As long as the lighting power of the nth mother lamp at time t+1 meets the maximum value, the minimum target power requirement of each element at time t+1 can be met.

[0121] Further, based on the power of each mother lamp at the current time t and the target power at the time t+1, the power adjustment speed is determined to control the power of each mother lamp and all lighting street lamps in the front area and the rear area thereof, specifically:

[0122] Get the actual power of each mother lamp at the current moment t; calculate the interval between the current moment t and the next moment;

[0123] The difference between the target power and the actual power is calculated and recorded as the power deviation. The ratio of the power deviation to the interval duration is used as the power adjustment speed of each mother lamp at the current time t. Based on the power adjustment speed, the power of the corresponding mother lamp and all the street lamps in the front and rear areas is controlled. Thus, the lighting power adjustment method based on real-time traffic flow is used to avoid excessive changes in lighting power caused by sudden changes in traffic flow, which may cause visual fatigue to the driver and enhance traffic safety.

[0124] It should be understood that although Figure 1The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 1 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0125] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0126] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the present application. It should be pointed out that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application without departing from the content of the technical solution of the present application, shall fall within the protection scope of the technical solution of the present application.

Claims

1. An urban traffic safety lighting system, characterized in that: The system comprises: The vehicle flow collection module is used to collect the vehicle flow monitored in real time by each mother lamp in the road lighting system, as well as the actual power of each mother lamp when it is working; The mother lamp association module is used to determine the inflow mother lamp corresponding to each mother lamp through the flow path of the vehicle between the mother lamps, and calculate the average time consumed by the vehicle according to the average time of multiple vehicles traveling between each inflow mother lamp of any mother lamp and any mother lamp thereof; The street lamp power adjustment module is used to adjust the power of the lighting street lamp in real time by predicting the traffic flow of the road where the mother lamp is located, including: (1) determining the intersection diversion weight of any mother light at each moment by the proportion of the traffic flow of any mother light at each moment to the traffic flow of all the mother lights flowing into it, and constructing a diversion weight vector for each mother light based on the intersection diversion weight of each mother light at all moments in multiple days; (2) Analyze the changes in the traffic volume of all the inflowing mother lights corresponding to each mother light in the local time period before the current moment, and the elements in the diversion weight vector at the corresponding moment, determine the estimated road traffic flow vector of each mother light at the next moment corresponding to the current moment, obtain the estimated road traffic flow vector of each mother light at multiple moments after the current moment through multiple iterative calculations, and obtain the estimated traffic flow density vector of each mother light at the current moment based on the average level of the elements in the estimated road traffic flow vector of each mother light at all moments after the current moment; (3) Determine the minimum lighting power corresponding to each element in the estimated traffic density vector based on the estimated traffic conditions of each element in the estimated traffic density vector and the power range of the lighting street lamps; determine the target power of each mother lamp at the next moment based on the minimum lighting power; determine the power adjustment speed of each mother lamp at the current moment based on the actual power and the target power, and adjust the power of the lighting street lamps.

2. An urban traffic safety lighting system as claimed in claim 1, characterized in that: The determining of the inflow mother lamp corresponding to each mother lamp includes: if the vehicle can travel from the starting mother lamp to any mother lamp without passing through other mother lamps, then determining the starting mother lamp as the inflow mother lamp corresponding to any mother lamp.

3. The urban traffic safety lighting system according to claim 1, characterized in that: The intersection diversion weight of any mother light at each time includes: The difference between the average time taken by any vehicle flowing into the mother light corresponding to each mother light at each moment is recorded as a specific moment; the traffic flow of any vehicle flowing into the mother light at the specific moment is taken as the basic traffic flow of any vehicle flowing into the mother light; The sum of all the basic traffic flows corresponding to each mother light at each moment and flowing into the mother light is taken as the total basic traffic flow of each mother light at each moment; The ratio of the traffic flow of each mother light at each moment to the total basic traffic flow is used as the intersection diversion weight of each mother light at each moment.

4. The urban traffic safety lighting system according to claim 1, characterized in that: The method for constructing the shunt weight vector of each mother lamp is: The intersection traffic flow vector of each mother light at each time of the day is formed by dividing the traffic flow weight of the intersection of each mother light at all times of the day; The mean of the elements of the same dimension in the traffic flow vectors of the intersection for each mother light on multiple days is calculated to form the diversion weight vector of each mother light.

5. The urban traffic safety lighting system according to claim 1, characterized in that: The step of determining the estimated road traffic flow vector at a subsequent moment corresponding to each mother lamp at the current moment includes: The average of the average time taken by the vehicle to travel from any mother light without passing through other mother lights to all other mother lights is taken as the road section time taken by the any mother light; The traffic flow of any mother light at each moment within the time taken by the road section before the current moment is used to form a road traffic flow vector of any mother light at the current moment; The first element in the road traffic flow vector of any incoming mother light at the current moment corresponding to each mother light is used as the estimated basic traffic flow of any incoming mother light at the current moment; The sum of the estimated basic traffic flows corresponding to each mother light and flowing into the mother light at the current moment is used as the estimated total basic traffic flow of each mother light at the current moment; Each element in the shunt weight vector of each mother lamp is recorded as the estimated shunt weight of each mother lamp at each moment; The product of the estimated diversion weight of each mother light at the current moment and the estimated total basic traffic flow is used as the estimated number of inflow vehicles of each mother light at the next moment corresponding to the current moment; the first element in the road traffic flow vector of each mother light at the current moment is eliminated, and the estimated number of inflow vehicles is used as the last element in the road traffic flow vector to obtain the estimated road traffic flow vector of each mother light at the next moment corresponding to the current moment.

6. An urban traffic safety lighting system as claimed in claim 5, characterized in that: The step of obtaining the estimated road traffic flow vector of each mother lamp at multiple moments after the current moment includes: Based on the estimated road traffic flow vector at a subsequent moment corresponding to the current moment of each mother lamp and the estimated diversion weight, the estimated road traffic flow vector at multiple moments after the current moment of each mother lamp is obtained through multiple iterative calculations.

7. An urban traffic safety lighting system as claimed in claim 1, characterized in that: The method of obtaining the estimated traffic density vector of each mother lamp at the current moment includes: Calculate the mean of all elements in the estimated road traffic flow vector of each mother lamp at any time after the current time, and record it as the traffic flow density at any time; The traffic density of each mother light at all moments after the current moment is combined to form an estimated traffic density vector of each mother light at the current moment.

8. The urban traffic safety lighting system according to claim 1, characterized in that: The calculation method of the minimum lighting power corresponding to each element in the estimated traffic density vector is: Obtain the power range of the lighting street lamp during operation, and obtain the minimum power and the maximum power; and use the difference between the maximum power and the minimum power of the lighting street lamp as the power adjustment amount of the lighting street lamp; The minimum lighting power P corresponding to the fth element in the estimated traffic density vector of the nth mother lamp at the current time t n,t,f The calculation method is: Wherein, LP is the minimum power of the lighting street lamp, HP is the maximum power of the lighting street lamp, CP is the power adjustment amount of the lighting street lamp, and ρ n,t,f is the fth element in the estimated traffic density vector of the nth mother light at the current time t, and min() is the minimum function.

9. An urban traffic safety lighting system as claimed in claim 7, characterized in that: Determine the target power of each mother lamp at the next moment, including: Counting the number of all elements in the estimated traffic density vector, and taking the ratio of the power adjustment amount to the number as the maximum power adjustment speed; The minimum target power TP corresponding to the fth element in the estimated traffic density vector at time t+1 t+1,f The calculation method is: TP t+1,f =P n,t,f -V×(f-1), where P n,t,f is the minimum lighting power corresponding to the fth element in the estimated traffic density vector of the nth mother lamp at the current time t, V is the maximum power adjustment speed, and f is the position number corresponding to the element in the estimated traffic density vector; The maximum value of the minimum target power corresponding to all elements in the estimated traffic density vector of each mother lamp at the current moment at the next moment is used as the target power of each mother lamp at the current moment at the next moment.

10. The urban traffic safety lighting system according to claim 1, characterized in that: The power adjustment speed of each mother lamp at the current moment is the change rate between the actual power at the current moment and the target power at the next moment.

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