Event-based adaptive lighting energy-saving control method and system

Abstract

The invention discloses a self-adaptive lighting energy-saving control method and system based on events, and relates to the field of lighting energy saving. The method comprises the following steps: according to the road brightness, the sunset moment of a date and the sunrise moment of a day after the date, determining the turn-on moment and the turn-off moment of a lighting lamp switch; taking the turn-on moment as a starting moment, taking the turn-off moment as an ending moment, when the number of the target objects at the current moment is greater than a preset threshold value, determining the turn-on number of the lighting lamps and the turn-on interval time of the lighting lamps, and calculating the voltage value of each turned-on lighting lamp by taking the maximum lighting brightness data of the lighting lamps as a brightness value; otherwise, when the current moment is earlier than the preset timed turn-off time, calculating the voltage value of each turned-on lighting lamp according to a preset gradually-darkening brightness change function; when the current moment is equal to the preset timed turn-off time, the voltage value of each turned-on lighting lamp is calculated; according to the invention, more efficient and energy-saving illumination can be realized.

Description

Technical Field

[0001] The present invention relates to the field of lighting energy saving, and in particular to an event-based adaptive lighting energy saving control method and system. Background Art

[0002] Global energy shortage and environmental pollution are prominent in the rapid economic development. Lighting is one of the main sources of energy consumption. Lighting redundancy has always been a key problem that needs to be solved. This redundancy is mainly reflected in the fact that invalid lighting takes up a lot of time. For example, street lights on both sides of the road still maintain full load lighting during the period when there are fewer people and cars. This relatively low lighting utilization rate seriously wastes precious electricity resources. Therefore, research on more efficient and energy-saving lighting control solutions has always been a hot research direction in this field.

[0003] In order to solve this problem, the existing technology has mainly carried out research from the aspects of luminescent materials, power sources, energy storage, driving power supplies and lighting control, and has made important progress. Among them, in terms of traditional lighting luminescent materials, high / low pressure sodium lamps have advantages such as higher light efficiency and economic life compared with fluorescent lamps and halogen tungsten lamps, and are widely used in places such as highways, cities, and main roads. Urban streets and highways are basically dominated by such high / low pressure sodium lamps, which provides great convenience for people's daily life. In addition, it is worth noting that with the continuous advancement of semiconductor compounds, LED lighting has become the new generation of light sources that are most likely to replace traditional light sources in the world today. Compared with traditional lighting sources, it has the advantages of high efficiency and low consumption, energy saving and environmental protection, low voltage drive, fast response speed, small size, easy assembly and combination, DC drive, no flicker and long service life. The demand for LED lighting in a wider range of fields such as signal indication, display and lighting applications is increasing. At present, LED lighting has the characteristics of safety, environmental protection and long life. In terms of power sources, thermal power generation and hydropower generation have always been the main sources of power. With the development of technology, some emerging energy sources have gradually replaced thermal power generation, which is mainly based on resource consumption, such as nuclear power generation, wind power generation, tidal power generation, biomass power generation, hydrogen power generation, solar energy, etc. These energy sources have been integrated into the main grid through certain power transmission and distribution technologies and flowed into thousands of households. In terms of energy storage, the development of battery technology has provided an effective solution to the problem of large-scale power storage for immediate use. In the field of battery research and development, lead-acid batteries based on chemical reactions were the first to enter the public's field of vision. Due to their large inventory, safe and rechargeable and recyclable, they are widely used in power, automobile, aerospace and other fields; in addition, lithium battery technology has advanced rapidly, and with its advantages of higher efficiency, larger capacity, high charging times and smaller size, it is widely used in consumer electronics, electric vehicles and satellites. The development of power storage technology has greatly improved the utilization rate of power resources. In terms of driving power, the corresponding driving power varies greatly depending on the luminescent material and lighting principle, and different driving power modes also seriously affect the luminous efficiency and service life. Therefore, designing an effective lighting driving power is also an effective means to implement energy-saving lighting. Taking the LED driving power as an example, it is usually necessary to convert the primary AC power into the required secondary DC power as the input power, that is, to convert the power supply into a specific voltage / current to drive the LED to emit light. The output power is generally a constant current that can change the voltage as the LED forward voltage changes. Its core components mainly include input filter devices, switch controllers, inductors, MOS switch tubes, feedback resistors, output filter devices, etc. In terms of lighting control, it has gone through two stages: manual switching and automatic switching.Among them, manual switch is to arrange specific personnel to turn on or off the lighting power switch manually according to lighting needs, such as in the evening, night, early morning when the light is insufficient, extreme weather and weather conditions with extremely low visibility, etc.; automatic switch is to realize the timed switch lighting according to the change of sunrise and sunset time throughout the year with a certain timer, or to use a certain controller and sensor detection technology to detect the light intensity to determine whether the lighting conditions are met, and whether pedestrians pass or leave this place to automatically realize the unattended function of lighting fixtures, which greatly improves the lighting utilization rate compared with manual switch. The above-mentioned methods provide effective technical means for energy-saving lighting, and also make outstanding contributions to green environmental protection and efficient energy utilization.

[0004] Although the above solutions have effectively solved the problem of lighting energy saving, there are still some shortcomings, such as the long research and development cycle of luminescent materials, certain technical barriers and the lag in the popularization and promotion of new materials; the existing power sources, including new energy technologies, have been in a slow development stage for a long time, and there has been no essential breakthrough in principle. Only some progress has been made in non-core aspects such as power generation efficiency, and its power generation is not enough to completely replace the existing thermal power generation. Therefore, in the short term, it is difficult to solve the problem of lighting energy saving from the power generation end; although the power storage technology has made great progress in recent years, the high investment cost, short life when used on a large scale, limited charging and discharging times, high maintenance cost, easy fire, high maintenance and recycling costs have also greatly restricted its use. Compared with these, the lighting control method seems to have become a lighting energy-saving means that can be flexibly mastered and controlled. However, the lighting switch control method commonly used based on infrared, grating and sound sensor detection technology still has certain shortcomings. It is usually triggered to light up when pedestrians pass by the detection point, or almost all lighting switches are triggered due to unexpected noise, which will inevitably lead to reduced effective lighting and poor energy saving effect. Summary of the invention

[0005] The purpose of the present invention is to provide an event-based adaptive lighting energy-saving control method and system, which can effectively balance the relationship between lighting and energy saving and achieve more efficient and energy-saving lighting.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] An event-based adaptive lighting energy-saving control method, the method comprising:

[0008] Obtaining the distance between adjacent lighting fixtures, the road surface brightness at the current moment, the movement speed of the target object at the current moment, the number of the target objects at the current moment, and the maximum number of the target objects; the current moment includes year, month, date, and time;

[0009] Determine the on and off times of the lighting fixture switch according to the road surface brightness, the sunset time of the date, and the sunrise time of the day after the date;

[0010] Taking the opening time as the starting time and the closing time as the ending time, determining whether the number of the target objects at the current time is greater than a preset threshold;

[0011] When the number of the target objects at the current moment is greater than a preset threshold, the number of lighting fixtures to be turned on and the interval time for turning on the lighting fixtures are determined according to the movement speed of the target objects and the distance, and the maximum lighting brightness data of the lighting fixtures is used as the brightness value to calculate the voltage value of each of the turned-on lighting fixtures; wherein the lighting fixture corresponding to the target object at the current moment is taken as the first lighting fixture to be turned on, and the lighting fixtures of the number to be turned on are turned on in sequence along the movement direction of the target object;

[0012] When the number of the target objects at the current moment is less than or equal to the preset threshold value, and the current moment is earlier than the preset timed closing time, the first brightness value of the lighting fixture turned on at the current moment is determined according to the preset dimming brightness change function, and the voltage value of each of the turned-on lighting fixtures is calculated;

[0013] When the number of target objects at the current moment is less than or equal to the preset threshold value, and the current moment is equal to the preset timed off time, the second brightness value of the lighting fixture turned on at the current moment is calculated based on the maximum and minimum values ​​of the average road surface brightness, the maximum number of the target objects, and the number of target objects at the current moment, and the voltage value of each of the turned lighting fixtures is calculated.

[0014] Optionally, determining the on time and off time of the lighting fixture switch according to the road surface brightness, the sunset time of the date, and the sunrise time of the day after the date specifically includes:

[0015] Calculate the sunrise time and the sunset time according to the current time;

[0016] Determine whether the current time is later than or equal to the sunset time;

[0017] When the current time is later than or equal to the sunrise time, determining whether the road surface brightness is less than or equal to a preset brightness threshold;

[0018] When the road surface brightness is less than or equal to a preset brightness threshold, turning on each of the lighting fixtures to obtain the turning-on time;

[0019] Determine whether the current time is later than or equal to the sunrise time;

[0020] When the current time is later than or equal to the sunrise time, determining whether the road surface brightness is greater than or equal to the preset brightness threshold;

[0021] When the road surface brightness is greater than or equal to the preset brightness threshold, each of the lighting fixtures is turned off to obtain the turning-off time.

[0022] Optionally, the formula for determining the number of lighting fixtures to be turned on is:

[0023]

[0024] Among them, Num on is the number of lighting fixtures turned on; S is the sight distance; L dis The distance between adjacent lighting fixtures.

[0025] Optionally, the formula for determining the interval time for turning on the lighting fixture is:

[0026]

[0027] Among them, Int on L is the interval time for turning on lighting fixtures; dis is the distance between adjacent lighting fixtures; v is the moving speed of the target object at the current moment.

[0028] Optionally, the preset dimming brightness change function is:

[0029] f(n)=L ave.max e 1-κ ;

[0030] Where f(n) is the brightness value of the turned-on lighting fixture; κ is the current moment; L ave.max is the maximum average brightness of the road surface.

[0031] Optionally, the calculation formula of the second brightness value is:

[0032]

[0033] Where, f(n) is the brightness value of the turned-on lighting fixture; L ave.max is the maximum average brightness of the road surface; L ave.min is the minimum average brightness of the road surface; n is the number of target objects at the current moment; N max The maximum number of target objects.

[0034] An event-based adaptive lighting energy-saving control system, the system comprising a plurality of independent control devices; each of the control devices comprises:

[0035] An event detection module, for detecting attributes of an event; the event is a moving object, person, and / or animal that can trigger the lighting fixture to turn on; the attributes include the direction of movement, the speed of travel, and the distance from the lighting fixture;

[0036] A sensor module for detecting time and road brightness;

[0037] A control module, connected to the event detection module and the sensor module respectively, for applying the event-based adaptive lighting energy-saving control method according to any one of claims 1 to 6 to generate a driving signal and a control signal for a lighting fixture according to the attributes, time and brightness of the event; the driving signal includes a voltage value of each of the lighting fixtures that are turned on; and the control signal includes the number of lighting fixtures that are turned on and the interval time for turning on the lighting fixtures;

[0038] A driving module, connected to the control module, and configured to turn on or off the lighting fixture according to the driving signal;

[0039] A communication module, connected to the control module, for transmitting control signals;

[0040] The independent control devices are connected via a communication module.

[0041] Optionally, each of the independent control devices further includes a power processing module; the power processing module is used to supply power to the event detection module, the sensor module, the control module, the drive module and the communication module.

[0042] Optionally, the power processing module includes a transformer, a rectifier, a filter and a voltage conversion chip connected in sequence.

[0043] Optionally, each of the independent control devices further includes a positioning module; the positioning module is connected to the control module; the positioning module is used to locate the longitude coordinates of the location of the lighting fixture.

[0044] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0045] The present invention discloses an event-based adaptive lighting energy-saving control method and system, which determines the on and off times of lighting fixture switches according to road brightness, the sunset time of a date, and the sunrise time of the day after the date; takes the on time as the starting time and the off time as the ending time, and judges whether the number of target objects at the current time is greater than a preset threshold; when the number of target objects at the current time is greater than the preset threshold, determines the number of lighting fixtures to be turned on and the interval time of turning on the lighting fixtures according to the movement speed and spacing of the target objects, and calculates the voltage value of each lighting fixture to be turned on with the maximum lighting brightness data of the lighting fixture as the brightness value; when the number of target objects at the current time is less than or equal to the preset threshold, and the current time is earlier than the preset timed off time When the number of target objects at the current moment is less than or equal to the preset threshold value, and the current moment is equal to the preset timed off time, the second brightness value of the lighting fixture turned on at the current moment is calculated according to the maximum and minimum values ​​of the average brightness of the road surface, the maximum number of target objects and the number of target objects at the current moment, and the voltage value of each lighting fixture turned on is calculated. The present invention adjusts the brightness of the lighting fixture by triggering an event. When an event is triggered, the brightness of the lighting fixture is increased. When there is no event, the lighting fixture is in a low-power working state, effectively balancing the relationship between lighting and energy saving, and achieving more efficient and energy-saving lighting. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 This is a schematic diagram of the effect of event-based adaptive lighting energy-saving control;

[0048] Figure 2 This is a schematic diagram of the hardware connection structure of the street light control node;

[0049] Figure 3 This is the hardware circuit schematic diagram of the minimum controller system;

[0050] Figure 4 This is the schematic diagram of the hardware circuit of the time module;

[0051] Figure 5 This is the hardware circuit schematic diagram of the communication module;

[0052] Figure 6 This is the circuit schematic diagram of the power processing module;

[0053] Figure 7 This is the hardware circuit schematic diagram of the brightness detection module;

[0054] Figure 8 This is the hardware circuit schematic diagram of the radar event detection module;

[0055] Fig. 9 This is the hardware circuit schematic diagram of the Beidou positioning module;

[0056] Fig.10 It is the schematic diagram of the control circuit based on relay and PWM pulse width modulation;

[0057] Fig.11 A schematic flow chart of the event-based adaptive lighting energy-saving control method provided by the present invention. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] The purpose of the present invention is to provide an event-based adaptive lighting energy-saving control method and system, aiming to effectively balance the relationship between lighting and energy saving and achieve more efficient and energy-saving lighting.

[0060] Based on the existing technology, the present invention designs an event-based adaptive lighting energy-saving control method and system, which can effectively balance the relationship between lighting and energy saving, and provides specific system design solutions for lighting energy-saving control problems in several special occasions. The present invention integrates electronic circuit technology, detection technology, positioning technology and communication technology to solve the problem of civil lighting energy saving, and can be widely used in indoor hall lighting of large buildings, urban street lamps, campus and park roadside lighting and other occasions.

[0061] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0062] Example 1

[0063] like Figure 1 As shown, the event-based adaptive lighting energy-saving control method in this embodiment includes:

[0064] Step S1: Obtain the distance between adjacent lighting fixtures, the road surface brightness at the current moment, the movement speed of the target object at the current moment, the number of the target objects at the current moment, and the maximum number of the target objects; the current moment includes year, month, date and time.

[0065] Step S2: Determine the on and off times of the lighting fixture switch according to the road surface brightness, the sunset time of the date, and the sunrise time of the day after the date.

[0066] S2 specifically includes:

[0067] Step S21: Calculate the sunrise time and the sunset time according to the current time.

[0068] Step S22: Determine whether the current time is later than or equal to the sunset time.

[0069] Step S23: When the current time is later than or equal to the sunrise time, determine whether the road surface brightness is less than or equal to a preset brightness threshold.

[0070] Step S24: when the road surface brightness is less than or equal to a preset brightness threshold, turn on each of the lighting fixtures to obtain the turn-on time.

[0071] Step S25: Determine whether the current time is later than or equal to the sunrise time.

[0072] Step S26: When the current time is later than or equal to the sunrise time, determine whether the road surface brightness is greater than or equal to the preset brightness threshold.

[0073] Step S27: When the road surface brightness is greater than or equal to the preset brightness threshold, turn off each of the lighting fixtures to obtain the turn-off time.

[0074] Step S3: Taking the opening time as the starting time and the closing time as the ending time, it is determined whether the number of the target objects at the current time is greater than a preset threshold.

[0075] Step S4: When the number of the target objects at the current moment is greater than a preset threshold, the number of lighting fixtures to be turned on and the interval time for turning on the lighting fixtures are determined according to the movement speed of the target objects and the distance, and the voltage value of each lighting fixture to be turned on is calculated using the maximum lighting brightness data of the lighting fixture as the brightness value; wherein the lighting fixture corresponding to the target object at the current moment is taken as the first lighting fixture to be turned on, and the number of lighting fixtures to be turned on are turned on in sequence along the movement direction of the target object.

[0076] Step S5: When the number of the target objects at the current moment is less than or equal to the preset threshold value, and the current moment is earlier than the preset timed closing time, the first brightness value of the lighting fixture turned on at the current moment is determined according to the preset dimming brightness change function, and the voltage value of each of the turned-on lighting fixtures is calculated.

[0077] Step S6: When the number of target objects at the current moment is less than or equal to the preset threshold value, and the current moment is equal to the preset timed off time, the second brightness value of the lighting fixture turned on at the current moment is calculated according to the maximum and minimum values ​​of the average brightness of the road surface, the maximum number of the target objects and the number of target objects at the current moment, and the voltage value of each of the turned-on lighting fixtures is calculated.

[0078] In practical applications, the present invention includes three parts: lighting switch adaptive control, lighting brightness adaptive control, and advance opening-lag closing and brightness adaptive control.

[0079] Part 1, adaptive control of lighting switches.

[0080] The sunrise and sunset of a day can be obtained by dividing the length of the day by the noon time. The noon time can be obtained based on the time zone and longitude. The time zone can be known based on the longitude. The length of the day can be calculated based on the sun's declination angle and the latitude, which are used as the reference time for turning off and on the street lights. The calculation process is as follows:

[0081] First, get the current year, month, and day, and calculate the number of days num from January 1 of that year to the current date. Calculate the current solar declination according to the following equation

[0082]

[0083] make According to the following logic, judge the polar day and polar night

[0084]

[0085] Read Beidou data to obtain the longitude l of the current street light on Location data, from which the time zone of the current street light is calculated

[0086]

[0087] if and The daylight hours at the current street light location are calculated using the following equation:

[0088]

[0089] From this, the solar noon time can be calculated according to the following equation:

[0090]

[0091] Then, the sunrise time t is calculated according to the following equations: rc and sunset time rl for:

[0092]

[0093] Although lighting can be adaptively controlled according to sunrise and sunset times, there is a certain difference between the road brightness at sunrise and sunset times felt by people in real life and the road brightness at sunset and sunrise times calculated theoretically. For example, at the theoretically calculated sunset time, the actual road brightness can fully meet the traffic safety needs, and it may only really affect the vision of traffic participants after a period of time; conversely, before the theoretically calculated sunrise time, the actual road brightness can also fully meet the vision needs of traffic participants. It can be seen that the actual lighting on and off time should be appropriately adjusted based on the theoretically calculated time to achieve the goal of effectively saving electric energy resources within a reasonable road brightness range. On the other hand, meteorological conditions are also an important factor in determining lighting. For example, under the influence of rain, snow, heavy fog and cloudy days caused by strong convection, the road brightness may drop sharply, thereby affecting the safety of traffic participants. According to the "Urban Road Lighting Design Standard" (CJJ45-2015), at sunset time t rl and sunrise time rc , the average brightness of the road surface should meet the maximum average brightness L ave.max and the minimum average brightness L ave.min To solve this problem, the present invention uses a brightness sensor to detect the road brightness condition, and sets a time threshold t that depends on experience. Δ , the lighting switch adaptive control algorithm is designed as follows:

[0094]

[0095]

[0096] The second part is adaptive control of lighting brightness.

[0097] The lighting switch adaptive control algorithm of the first part can adaptively adjust the lighting switch time according to the actual average brightness of the road surface, which can not only ensure driving safety, but also achieve the goal of energy saving. After the lighting is turned on, there is still room for energy saving. For example, in the time period when there are no pedestrians and vehicles, the lighting can be turned off or the lighting brightness can be lowered to further save electricity, while in the time period when there are pedestrians and vehicles, the maximum lighting brightness can be turned on. In order to balance the lighting and energy saving needs, the present invention uses the road brightness, traffic flow and parking sight distance as the main parameters for designing the lighting brightness adaptive adjustment algorithm. Determine the maximum traffic capacity N allowed by the road based on the road type and the "Urban Road Engineering Design Code" (CJJ37-2012) max and the minimum traffic flow N min , and the corresponding maximum average road brightness L ave.max and the minimum value L ave.min , the functional relationship between the actual lighting brightness and the vehicle flow n is calculated as:

[0098]

[0099] Considering that at night or when there are no vehicles or pedestrians on the road for a long time, if the maximum lighting brightness is maintained continuously, it will cause a great waste of electricity, or according to equation (8), maintaining a very low lighting brightness with a minimum number of vehicles will inevitably cause a great impact on traffic participants. To this end, this design proposes an event-based lighting brightness adaptive adjustment algorithm, which uses a method of turning on the maximum lighting and dimming the rear brightness by forward speed tracking, in order to achieve the purpose of further balancing lighting and energy saving. The main idea of ​​the algorithm is: during sunset, according to the expected lighting brightness L des Calculate the required lighting intensity

[0100]

[0101] After the lighting is turned on, the road traffic volume is detected. If the traffic volume is large, the required lighting brightness is calculated according to equation (8); otherwise, the lighting should be turned off or turned on based on the minimum traffic volume. However, when pedestrians or vehicles appear occasionally, the maximum lighting brightness L is turned on ahead of them in the direction of travel. ave.max , the number of lights turned on Num on The driver's stopping sight distance S should be taken into consideration. The stopping sight distance refers to the shortest driving distance required for the driver to safely stop the car from the moment he sees the obstacle in front of him to the moment he reaches the obstacle. The stopping sight distance is calculated by the driving distance within the reaction time. Braking distance from start of braking to complete stop And the safety distance S 0 The stopping sight distance is

[0102]

[0103] In order to keep the front of the vehicle always open Num on lighting, designed at a certain time interval Int on Turn on the lighting fixture forward; when the vehicle passes the street lamp, the street lamp will turn off the lighting at a certain time interval or adjust the lighting brightness to the minimum traffic flow according to equation (8). In equation (10), t ac is the driver's reaction time, generally 2.5s; k is the braking coefficient, generally between 1.2-1.4; i is the road longitudinal slope coefficient, +2 for uphill and -2 for downhill; τ is the longitudinal friction coefficient between the road surface and the tire, which varies depending on the conditions of the tire, road surface, braking, etc. The calculation of the stopping sight distance is generally based on the wet state of the road surface; the safety distance S 0 Generally, it is taken as (5-10m); v is the driving speed, and when the road design speed is 120-80km / h, take 85% of the maximum speed; when the road design speed is 60-40km / h, take 90% of the maximum speed; when the road design speed is 30-20km / h, take 100% of the maximum speed.

[0104] In order to balance the relationship between lighting brightness and energy saving as much as possible after the street lights are turned on, the present invention designs an event-based adaptive lighting brightness adjustment algorithm. The algorithm reads the current time through the Beidou positioning chip and detects the current road traffic volume through radar. From sunset to sunrise, if the system time is within the street light on time period, the lighting brightness is calculated according to equation (9); when the street lights are turned on, the lighting brightness is calculated according to equation (8). If the radar detects an event during this period, the movement speed of the event is read, and the parking sight distance is calculated according to equation (10). Then, the number of lightings that need to be turned on in front of the event and the order and interval between the lightings are calculated based on the event movement speed and the parking sight distance. In order to ensure short-term brightness requirements, these street lights will turn on the brightness to the maximum. The specific content of the event-based adaptive lighting brightness adjustment algorithm is given as follows:

[0105]

[0106]

[0107] Algorithms 1 and 2 determine the time when the lighting is turned on and off and the basic method for adaptively adjusting the lighting brightness after it is turned on. According to the lighting brightness requirements under different conditions, it is necessary to convert it into a control loop PWM pulse width period. The present invention normalizes the lighting brightness f(n) to obtain the PWM pulse width percentage:

[0108]

[0109] The third part is advance opening, delayed closing and adaptive brightness control.

[0110] After the street light is turned on, there is a considerable amount of ineffective lighting for a long time. In order to improve the energy saving level and lighting effect, this design proposes a street light advance start and delay tracking dimming algorithm based on the above algorithm. The main idea of ​​the algorithm is: after the light is turned on, if the radar detects an event, it reads the movement speed of the event and calculates the stopping sight distance according to equation (10). Then, according to the movement speed of the event and the stopping sight distance, the number of lightings that need to be turned on in front of the event and the order and interval between these lightings are calculated; the first street light controller that detects the event sends the street light ID number that needs to be turned on in the direction of movement through the wireless communication module. These street light IDs that receive the turn-on command turn on the street light without delay and turn the brightness to the maximum, and adjust the PWM duty cycle to the maximum of 1. When the event leaves the lighting range of the current ID street light, it means that the radar of the street light ID cannot detect the event. At this time, the street light controller starts the timer and reduces the lighting brightness according to the exponential relationship according to the timer count until the timing ends, and the lighting brightness is calculated according to equation (8). This can achieve the goal of turning on the street lamps in advance to improve the illumination when an incident occurs, and lowering the lighting brightness by delayed tracking to achieve the purpose of energy saving. The specific process is shown in Algorithm 3.

[0111]

[0112] The specific working process of the present invention is as follows:

[0113] Step 1: Initialize the hardware circuit and software program parameters, configure the street light ID, radar module, brightness detection module and PWM cycle parameters, etc.; set the street light distance, maximum speed limit, expected brightness, maximum flow, driver reaction time t ac and the maximum brightness value.

[0114] Step 2: Call Algorithm 1 to perform adaptive control on the street light switch;

[0115] Step 3: After the street light is turned on, if the lighting brightness needs to be adjusted, call Algorithm 2 to adaptively adjust the lighting brightness based on the event;

[0116] Step 4: After the street lights are turned on, if the road is in a stage with low traffic volume and no pedestrians and vehicles for a long time, for occasional events, call Algorithm 3 to turn on the street lights at the highest brightness in advance. When the street light radar cannot detect the event, start delayed tracking to reduce the lighting brightness;

[0117] Step 5: When the system detects that the current time is close to sunrise, it calls Algorithm 1 to perform adaptive shutdown control on the street lighting.

[0118] The present invention can save a lot of electricity expenses in lighting occasions, and at the same time can increase the viewing experience in some roads, parks, campuses, along rivers / coasts and other occasions; in addition, it is easy to use, cost-effective, and easier to realize expanded functions.

[0119] Example 2

[0120] The present invention provides an event-based adaptive lighting energy-saving control system, the system comprising a plurality of independent control devices; each of the control devices comprises:

[0121] The event detection module is used to detect the attributes of an event; the event is a moving object, person and / or animal that can trigger the lighting fixture to turn on; the attributes include the direction of movement, the speed of travel and the distance from the lighting fixture.

[0122] Sensor module, used to detect time and road brightness.

[0123] A control module, connected to the event detection module and the sensor module respectively, for applying the event-based adaptive lighting energy-saving control method described in any one of claims 1 to 6 according to the attributes of the event, time and brightness of the road surface, to generate driving signals and control signals for lighting fixtures; the driving signal includes the voltage value of each of the turned-on lighting fixtures; and the control signal includes the number of turned-on lighting fixtures and the interval time for turning on the lighting fixtures.

[0124] The driving module is connected to the control module and is used to turn on or off the lighting fixture according to the driving signal.

[0125] The communication module is connected to the control module and is used for transmitting control signals.

[0126] The independent control devices are connected via a communication module.

[0127] As a specific implementation, each of the independent control devices further includes a power processing module; the power processing module is used to supply power to the event detection module, the sensor module, the control module, the drive module and the communication module. Each of the independent control devices further includes a positioning module; the positioning module is connected to the control module; the positioning module is used to locate the longitude coordinates of the location of the lighting fixture.

[0128] The power processing module includes a transformer, a rectifier, a filter and a voltage conversion chip which are connected in sequence.

[0129] In the present invention, external moving objects such as pedestrians and vehicles that can trigger the lighting fixtures to turn on are defined as events, and the lighting fixture control logic is triggered according to the change in the motion state of the event to achieve maximum utilization of lighting efficiency. In the present invention, separate control modules are configured for all independent controlled objects in the lighting occasion, namely lighting fixtures, and wireless communication modules are used to achieve data transmission between each other; the event detection module is used in the design to effectively detect the movement direction, travel speed and distance from the current lighting fixture of the event. Specifically, a radar event detection module is used, that is, Figure 8 LD303-24G radar module in. According to the radar detection principle, it can scan the relative distance between the vehicle or pedestrian and the radar installation point (street lamp), and then divide the root distance by the time difference to get the real-time distance and position; the brightness module is used to detect the road brightness, and is used to determine the current light brightness as one of the factors to control the switch of lighting fixtures; the time module is used to determine the current time, and the current time can be used as one of the important factors to control the switch of lighting fixtures; the power module can realize the power supply of lighting fixtures and control modules, and has the ability to provide 220V AC to high-power lighting fixtures and convert it into electricity for control modules; the lighting drive module realizes the switch control of lighting fixtures by receiving the signal of the controller, and also has the dimming function. The hardware part of the control system mainly includes the STC15W201S series microcontroller with lower power consumption as the core component of the control module; power module, lighting drive circuit, RS232 serial bus communication module, including wireless communication module based on PTR2000 and LD303-24G radar module for event detection, Beidou positioning module UM220-IV, IIC serial bus detection module, including road brightness detection module based on GY30 and time module based on DS1302. Each unit module coordinates to complete analysis, decision-making and execution of actions. The overall working principle of the hardware circuit is as follows Figure 2 shown.

[0130] The power processing module is composed of a transformer, a rectifier bridge, a filter and a voltage conversion chip. The input of the transformer is 220V AC, which is converted into 5V voltage by the transformer; after that, the 5V power needs to be rectified into a 5V DC signal through a silicon stack (rectifier bridge). However, since the DC signal still has pulsation at this time, it is not conducive to using it as a power supply for the chip, so it needs to be rectified and deburred by the capacitor in the filter circuit and other clutter signals. Only then can the processed signal be provided to other electrical components and chips. In order to realize the mutual communication between each street light node, this design uses a PTR2000 wireless communication module based on a serial protocol; in order to realize the detection of events and their movement speed, this design uses a laser radar module based on LD303-24G, and uses a serial protocol to receive the detected event status in the form of an interrupt by the controller; in addition, in order to realize the detection of road brightness, the GY30 photosensor is integrated into the sensor end. The design uses the detected light intensity as one of the bases for judging whether to turn on the lighting or the lighting intensity of the lamp; the design integrates a clock module based on DS1302 to judge in real time when The sunrise and sunset time of the day is used as one of the important bases for judging whether to turn on the lighting or the lighting intensity of the lamps. In the design, the Beidou positioning module UM220-IV is used to locate the longitude and latitude coordinates of the street lamps and determine the theoretical time of sunrise and sunset. As the only controlled object of this design, the lighting fixture, a control circuit based on relays and PWM pulse width modulation is designed, which can provide the corresponding power supply voltage according to the driving power required by the lighting fixture. The controller used in the design is STC15W201S-SOP16, which has an integrated crystal oscillator circuit, and can be set between 5MHz and 35MHz through programming (#define MAIN_Fosc 12000000L). Figures 3 to 10 The component parameters are shown in Table 1.

[0131] Table 1 Component parameter table

[0132] R2 10KΩ C5 10uF R3 170KΩ C3 20uF C6 4.7uF C9 680uF C4 20uF C7 0.1uF C10 0.1uF Y1 8MHz L1 330uH C11 330uF Y2 12.768KHz C8 0.1uF C12 0.1uF C13 10uF FR1 1.5A (self-recovery insurance) C15 100nF C14 100nF D1 1N4148 C16 100nF R4 10KΩ D2 1N4148 L2 68nH

[0133] On the basis of the street lamp control module, the communication module between lighting nodes is used to realize data transmission between each other, so as to achieve the goal of lighting energy saving. The core idea of ​​the lighting energy saving control method is that when the event detection module is triggered by the moving event, the control module determines whether the distance between the event and the lighting fixture is within the lighting range according to the data provided by the detection module. Specifically, it is determined according to the relative distance between the laser radar installed on the lighting fixture control module and the event detection and the lighting fixture. If it enters the lighting range, the lighting driving module is controlled to turn on the lighting fixture. In addition, the main difference between the present invention and the existing energy-saving lighting method is that the moving direction of the event is determined by the event state data provided by the detection module, and a number of street lamps are turned on in advance in the moving direction according to the moving speed of the event, and the number of turned on is directly related to the moving speed of the event. The faster the speed, the more the number of lighting fixtures turned on in the moving direction of the event, and the faster the turning on speed; when the event passes through the lighting node, according to its moving direction, the lamps are controlled from far to near at a certain speed from the coming direction to the going direction to turn off and / or reduce the street lamp lighting brightness. In this process, the illumination can be slowly reduced according to the characteristics of the lamp until it is completely turned off. In addition, for some events such as pedestrians, they may stay briefly or remain stationary within the lighting range. The detection module can determine whether there is an event within the lighting range of the current lamp based on the micro-movements of the event, and then determine whether the lighting is turned on.

[0134] 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.

[0135] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An event-based adaptive lighting energy-saving control method, characterized in that: The method comprises: Obtaining the distance between adjacent lighting fixtures, the road surface brightness at the current moment, the movement speed of the target object at the current moment, the number of the target objects at the current moment, and the maximum number of the target objects; the current moment includes year, month, date, and time; Determine the on and off times of the lighting fixture switch according to the road surface brightness, the sunset time of the date, and the sunrise time of the day after the date; Taking the opening time as the starting time and the closing time as the ending time, determining whether the number of the target objects at the current time is greater than a preset threshold; When the number of the target objects at the current moment is greater than a preset threshold, the number of lighting fixtures to be turned on and the interval time for turning on the lighting fixtures are determined according to the movement speed of the target objects and the distance, and the maximum lighting brightness data of the lighting fixtures is used as the brightness value to calculate the voltage value of each of the turned-on lighting fixtures; wherein the lighting fixture corresponding to the target object at the current moment is taken as the first lighting fixture to be turned on, and the lighting fixtures of the number to be turned on are turned on in sequence along the movement direction of the target object; When the number of the target objects at the current moment is less than or equal to the preset threshold value, and the current moment is earlier than the preset timed closing time, the first brightness value of the lighting fixture turned on at the current moment is determined according to the preset dimming brightness change function, and the voltage value of each of the turned-on lighting fixtures is calculated; When the number of target objects at the current moment is less than or equal to the preset threshold value, and the current moment is equal to the preset timed off time, the second brightness value of the lighting fixture turned on at the current moment is calculated based on the maximum and minimum values ​​of the average road surface brightness, the maximum number of the target objects, and the number of target objects at the current moment, and the voltage value of each of the turned lighting fixtures is calculated.

2. The event-based adaptive lighting energy-saving control method according to claim 1, characterized in that: Determining the on and off times of lighting fixture switches according to the road surface brightness, the sunset time of the date, and the sunrise time of the day after the date, specifically includes: Calculate the sunrise time and the sunset time according to the current time; Determine whether the current time is later than or equal to the sunset time; When the current time is later than or equal to the sunrise time, determining whether the road surface brightness is less than or equal to a preset brightness threshold; When the road surface brightness is less than or equal to a preset brightness threshold, turning on each of the lighting fixtures to obtain the turning-on time; Determine whether the current time is later than or equal to the sunrise time; When the current time is later than or equal to the sunrise time, determining whether the road surface brightness is greater than or equal to the preset brightness threshold; When the road surface brightness is greater than or equal to the preset brightness threshold, each of the lighting fixtures is turned off to obtain the turning-off time.

3. The event-based adaptive lighting energy-saving control method according to claim 1, characterized in that: The formula to determine the number of lighting fixtures to be turned on is: Among them, Num on is the number of lighting fixtures turned on; S is the sight distance; L dis The distance between adjacent lighting fixtures.

4. The event-based adaptive lighting energy-saving control method according to claim 1, characterized in that: The formula for determining the interval time for turning on lighting fixtures is: Among them, Int on L is the interval time for turning on lighting fixtures; dis is the distance between adjacent lighting fixtures; v is the moving speed of the target object at the current moment.

5. The event-based adaptive lighting energy-saving control method according to claim 1, characterized in that: The preset dimming brightness change function is: f(n)=L ave.max e 1-κ ; Where f(n) is the brightness value of the turned-on lighting fixture; κ is the current moment; L ave.max is the maximum average brightness of the road surface.

6. The event-based adaptive lighting energy-saving control method according to claim 1, characterized in that: The calculation formula of the second brightness value is: Where, f(n) is the brightness value of the turned-on lighting fixture; L ave.max is the maximum average brightness of the road surface; L ave.min is the minimum average brightness of the road surface; n is the number of target objects at the current moment; N max The maximum number of target objects.

7. An event-based adaptive lighting energy-saving control system, characterized in that: The system includes a plurality of independent control devices; Each of the control devices comprises: An event detection module, for detecting attributes of an event; the event is a moving object, person, and / or animal that can trigger the lighting fixture to turn on; the attributes include the direction of movement, the speed of travel, and the distance from the lighting fixture; A sensor module for detecting time and road brightness; A control module, connected to the event detection module and the sensor module respectively, for applying the event-based adaptive lighting energy-saving control method according to any one of claims 1 to 6 to generate a driving signal and a control signal for a lighting fixture according to the attributes, time and brightness of the event; the driving signal includes a voltage value of each of the lighting fixtures that are turned on; and the control signal includes the number of lighting fixtures that are turned on and the interval time for turning on the lighting fixtures; A driving module, connected to the control module, and configured to turn on or off the lighting fixture according to the driving signal; A communication module, connected to the control module, for transmitting control signals; The independent control devices are connected via a communication module.

8. The event-based adaptive lighting energy-saving control system according to claim 7, characterized in that: Each of the independent control devices also includes a power processing module; the power processing module is used to supply power to the event detection module, the sensor module, the control module, the drive module and the communication module.

9. The event-based adaptive lighting energy-saving control system according to claim 8, characterized in that: The power processing module includes a transformer, a rectifier, a filter and a voltage conversion chip which are connected in sequence.

10. The event-based adaptive lighting energy-saving control system according to claim 7, characterized in that: Each of the independent control devices further comprises a positioning module; the positioning module is connected to the control module; the positioning module is used to locate the longitude coordinates of the location of the lighting fixture.

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