A smart street lamp control system and method based on the Internet of Things

Abstract

The present invention relates to the field of street lamp control, and specifically to an intelligent street lamp control system and method based on the Internet of Things, comprising: a parallel photosensitive module, a pulse recording module, a model building module, an object positioning module and a light state control module, wherein the parallel photosensitive module is used to generate a control current according to the light intensity of the street lamp, a signal receiving device is used to receive a pulse signal, the pulse recording module is used to analyze the current and generate a unit pulse signal, the model building module is used to calculate the shape of an object under the street lamp and establish an analysis model, the object positioning module is used to calculate the moving speed and current position of a pedestrian, and the light state control module is used to adjust the brightness and illumination angle of the street lamp. The present invention can more accurately identify the position of pedestrians, increase the automation level of intelligent street lamps, avoid glare on people caused by direct light from street lamps, help improve road safety, and enhance the comfort and sense of security of pedestrians.

Description

Technical Field

[0001] The present invention relates to the field of street lamp control, and in particular to an intelligent street lamp control system and method based on the Internet of Things. Background Art

[0002] Smart street lights use advanced information technology and communication technology to upgrade and transform traditional street lights to make them more intelligent, efficient, environmentally friendly, and safe. Compared with traditional street lights, they can achieve remote control, energy conservation, environmental perception, intelligent management, and security functions.

[0003] A smart street light can adjust the brightness and angle of the light by sensing changes in the surrounding environment. The existing technology usually uses a built-in infrared sensor or sound wave measurement device to determine the position of people or pedestrians on the road, thereby changing the brightness of the street light. However, the infrared sensor has a long time and weak sensitivity, and cannot identify vehicles or pedestrians wearing heavy clothes. The sound wave measurement is easily interfered by the noisy noise on the road, and the recognition accuracy is poor.

[0004] In addition, due to the difference in brightness at different locations within the illumination range of the street lamp, pedestrians or vehicles at different heights passing by are easily illuminated by the direct light of the street lamp, causing glare. The commonly used method of adjusting the angle of the street lamp is difficult to meet the general lighting requirements of the road at the same time. Summary of the invention

[0005] The purpose of the present invention is to provide a smart street lamp control system and method based on the Internet of Things to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a smart street light control system based on the Internet of Things, comprising: a parallel photosensing module, a pulse recording module, a model building module, an object positioning module and a light state control module;

[0007] The parallel photosensitive module is composed of a photosensitive element arranged at a position parallel to the road surface on the other side of the street lamp and a signal receiving device inside the street lamp. The photosensitive element is used to receive the light irradiated by the street lamp with a constant brightness and generate current according to the intensity of the received light. The signal receiving device is used to receive the pulse signal emitted by the photosensitive element and record the source and occurrence time of the pulse signal in a database.

[0008] The pulse recording module is used to analyze the current emitted by the photosensitive element. When it is detected that the current change rate exceeds the threshold, a unit pulse signal is generated, and the pulse signal is sent to the signal receiving device inside the street lamp through a preset antenna. After the pulse signal is sent twice in succession, the receiving records of all pulse signals are arranged in chronological order in the database until the last photosensitive element sends a pulse signal twice in succession for a preset time length, and then the records in the database are output;

[0009] The model building module is used to calculate the length range of pedestrians passing under street lamps according to the output records of the database, the street lamp interval and the road surface parameters, summarize the output records of multiple street lamps in the master control platform, calculate the projection of each contour point of the pedestrian under the illumination of the street lamp, and establish an analysis model according to the projection of all contour points;

[0010] The object positioning module is used to calculate the pedestrian's moving speed based on the time when the pulse is received in the output record and the position of the pulse signal source element, and then predict the pedestrian's current position based on the pedestrian's moving speed and the position of the last element that sends two consecutive pulse signals;

[0011] The lighting state control module is used to determine the length of the lighting interval based on the forward speed of the object, increase the brightness of all street lamps in the lighting interval in front of the estimated position of the pedestrian, and calculate the light intensity of the pedestrian within the main light moment illumination range of each street lamp, and adjust the street lamp illumination angle according to the light intensity so that the light intensity falling on the highest point of the object remains unchanged.

[0012] Furthermore, the parallel photosensitive module includes: a component setting unit and a signal receiving unit;

[0013] The element setting unit is used to set the photosensitive element on the other side of the road parallel to the street lamp, and the photosensitive element is equipped with a photosensitive device, a power supply device and a communication device;

[0014] The signal receiving unit is arranged in the intelligent street light, and is used for receiving the pulse signal sent by the photosensitive element, and recording the time and source of the pulse signal.

[0015] Further, the pulse recording module includes: a signal generating unit and a timing recording unit;

[0016] The signal generating unit is composed of an ammeter, a logic circuit and a pulse generator, which is connected in series with the photosensitive element to detect the current in the photosensitive element. When the current change rate is higher than a threshold, a pulse signal is sent to the corresponding street lamp;

[0017] The time sequence recording unit is used to record all pulse signals in a database and arrange them in time sequence to form a signal data set.

[0018] Further, the model building module includes: a shadow analysis unit, a contour drawing unit and an object shaping unit;

[0019] The shadow analysis unit is used to calculate the time taken by the shadow to enter the street lamp range and leave the street lamp range according to the time when the pulse signal in the signal data set is sent;

[0020] The contour drawing unit is used to calculate the projection area of ​​the shadow at different angles according to the time the shadow takes at different positions;

[0021] The object shaping unit is used to fit the model of the object under the street lamp according to the projection areas at different positions, so as to calculate the height and width of the object.

[0022] Further, the object positioning module includes: a position resolution unit and a travel speed unit;

[0023] The position analysis unit is used to measure the current position of the pedestrian according to the position of the photosensitive element that last sent a pulse signal;

[0024] The travel speed unit is used to determine the walking speed and walking direction of the pedestrian according to the duration of the pulse signal emitted by two adjacent photosensitive elements.

[0025] Furthermore, the light state control module includes: a brightness adjustment unit, an angle adjustment unit and a light moment measurement unit;

[0026] The brightness adjustment unit is arranged in the street lamp, and comprises a signal receiving device and a variable resistor, and is used to adjust the brightness of the street lamp in front of the pedestrian's walking direction;

[0027] The angle adjustment unit is arranged at the connection between the lampshade and the lamp pole, and is used to adjust the angle of illumination of the street lamp according to the received control signal;

[0028] The optical moment measuring unit is used to calculate the light intensity received by the pedestrian at the location according to the illumination angle and light intensity of the current street lamp.

[0029] A smart street lamp control method based on the Internet of Things includes the following steps:

[0030] Step S1. A photosensitive element is arranged at a position parallel to the street lamp on the other side of the road, and another photosensitive element is arranged between two adjacent photosensitive elements, wherein the photosensitive element can change the current emitted by itself according to the light intensity of the street lamp, and all photosensitive elements and street lamps are numbered;

[0031] Step S2. Turn on the streetlight and operate it at a constant first brightness. When the rate of change of the current passing through the photosensitive element is higher than the threshold, a pulse signal is sent to the master control, and the master control records the source and occurrence time of the pulse signal;

[0032] Step S3. According to the projection analysis method, the height and average speed of the pedestrian are calculated according to the interval of the pulse signal emitted by each photosensitive element, and the width and travel direction of the pedestrian are obtained from the distance between two adjacent photosensitive elements and the time difference of emitting the pulse signal;

[0033] Step S4. The current position of the user is obtained from the position of the photosensitive element that last emitted a pulse signal, and the user's travel speed is multiplied by the preset lighting time to obtain the lighting interval of the street lamp, and the brightness of all street lamps within the lighting interval in the direction of the user's travel is increased;

[0034] Step S5. According to the direct illumination calculation method, the angle of each street lamp when directly shining on the pedestrian is calculated based on the pedestrian position, pedestrian height and street lamp height, recorded as the target angle, and the angle of each street lamp in the illumination range is adjusted so that the direct illumination angle of the street lamp avoids the target angle of all pedestrians on the road.

[0035] Further, step S1 includes:

[0036] Step S11. Number the street lamps on the road, and set a photosensitive element on the other side of the road so that the photosensitive element and the street lamp are located at the same position on both sides of the road. The photosensitive element is equipped with a photosensitive device, a power supply device and a communication device for detecting the brightness of the light irradiated on the element and changing the internal current size according to the detected brightness;

[0037] The set photosensitive elements are recorded as a set {W1, W2, ..., Wn}, where n represents the number of street lamps, n ≥ 3, and Wn represents the photosensitive elements parallel to street lamp n;

[0038] Step S12: Set another photosensitive element at the midpoint of the line connecting two adjacent photosensitive elements, and renumber the newly added photosensitive elements, which are recorded as a set {W (1,2) ,W (2,3) ,…,W (n-1,n)}, where W (n-1,n) Represents the photosensitive element W n-1 and W n A photosensitive element is arranged between them.

[0039] Further, step S2 includes:

[0040] Step S21. Preset the first brightness Q1, turn on the street lamp, make the street lamp illuminate the photosensitive element at the first brightness, and record the current in the photosensitive element;

[0041] Step S22. Construct a function F(t) with time as the independent variable and the current in the photosensitive element as the dependent variable, where t is time, and detect the derivative F of the function F(t) at the current moment. ’ (t0), where t0 is the current time;

[0042] When |F ’ When (t0)|≥a, a unit pulse signal is transmitted to the control center through the communication device in the photosensitive element, where a is the preset change rate threshold;

[0043] Step S23. After receiving the unit pulse signal from the photosensitive element, the control center records the time when the pulse signal is received and the source of the pulse signal in the database.

[0044] Further, step S3 includes:

[0045] Step S31. If two pulse signals sent by the same photosensitive element are recorded in the database, the photosensitive element sending the signal is marked as a target element. When at least three consecutive elements are marked as target elements, step S32 is executed;

[0046] Step S32. Calculate the height of the pedestrian according to the time when the adjacent element sends out a pulse according to the projection analysis method. The projection analysis method is as follows:

[0047] S32-1. The time when the first target element sends a pulse is recorded as ta1, the time when the element sends a pulse again is recorded as ta2, the time when the second target element sends a pulse for the first time is recorded as tb1, the time when the second pulse is sent is recorded as tb2, the time when the third target element sends a pulse for the first time is recorded as tc1, and the time when the second pulse is sent is recorded as tc2;

[0048] S32-2. Calculate the height and average speed of pedestrians using the following formula: Among them, θ represents the horizontal illumination deflection angle, v represents the average walking speed of pedestrians, H represents the height of pedestrians, LS represents the distance between the two photosensitive elements, L represents the horizontal distance between the street lamp and the second target element, and h represents the height of the street lamp;

[0049] Step S33. Calculate the width d of the pedestrian, where d=v·(ta2-ta1), and obtain the direction of travel of the pedestrian based on the order in which the photosensitive elements emit pulses. The direction of travel is the direction from the photosensitive element that emits the pulse first to the photosensitive element that emits the pulse later.

[0050] Further, step S4 includes:

[0051] Step S41. Subtract the current time from the last pulse signal time recorded in the database to obtain the pedestrian's travel time, multiply the pedestrian's travel time by the pedestrian's average walking speed to obtain the travel distance, and extend the travel distance along the road in the direction of travel at the photosensitive element position corresponding to the last pulse signal to obtain the pedestrian's current position;

[0052] Step S42: Calculate the length Z of the lighting interval of the street lamp, where Z=v·r, where r represents the preset lighting time, and increase the brightness of all street lamps in the lighting interval in front of the pedestrian's position.

[0053] Further, step S5 includes:

[0054] Step S51. According to the direct illumination calculation method, the angle of each street lamp when directly irradiating the pedestrian is calculated based on the pedestrian position, pedestrian height and street lamp height. The direct illumination calculation method is as follows: Among them, ω represents the target angle, t0 represents the current time, and tg represents the time of the last pulse signal recorded in the database;

[0055] Step S52: Calculate the target angle of all pedestrians on the road, and adjust the direct angle of the street lamps within the illumination range so that the direct angle of all street lamps avoids the target angle of the pedestrians.

[0056] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0057] The present invention can set a photosensitive element on the other side of the street lamp. When the rate of change of the current of the photosensitive element is higher than a threshold value, a pulse signal is sent to the street lamp. The street lamp records the source and sending time of the pulse signal, and uses the shadows created by pedestrians blocking the light instead of infrared or ultrasonic sensing devices to perform personnel identification. The position of pedestrians can be identified more accurately, the automation level of smart street lamps can be increased, and the visual comfort of road participants can be improved.

[0058] The present invention can calculate the shape of pedestrians under street lamps, the coordinates of pedestrians and their forward speed according to the street lamp spacing, the height of street lamps, the pulse signals emitted by each photosensitive element and the distance between the street lamps and the road surface. It can enable the road system to identify the movement trend of pedestrians and adjust the road lights in advance, which is beneficial to reducing the electricity cost of street lamps and improving lighting efficiency.

[0059] The present invention can adjust the angle of the lampshade within the illumination range according to the height of the pedestrians, so that the light intensity falling on the highest point of the pedestrians remains unchanged, avoiding glare for people caused by direct light from street lamps, helping to improve road safety, reduce light pollution from street lamps, and enhance the comfort and sense of security of pedestrians. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0061] Figure 1 It is a structural schematic diagram of a smart street lamp control system based on the Internet of Things of the present invention;

[0062] Figure 2It is a schematic diagram of the steps of a smart street lamp control method based on the Internet of Things of the present invention. DETAILED DESCRIPTION

[0063] 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.

[0064] See also Figure 1 ,The present invention provides a technical solution: a smart street light control system based on the Internet of Things, including: a parallel photosensing module, a pulse recording module, a model building module, an object positioning module and a light state control module;

[0065] The parallel photosensitive module is composed of a photosensitive element arranged at a position parallel to the road surface on the other side of the street lamp and a signal receiving device inside the street lamp. The photosensitive element is used to receive the light irradiated by the street lamp with a constant brightness and generate current according to the intensity of the received light. The signal receiving device is used to receive the pulse signal emitted by the photosensitive element and record the source and occurrence time of the pulse signal in a database.

[0066] The parallel photosensitive module comprises: a component setting unit and a signal receiving unit;

[0067] The element setting unit is used to set the photosensitive element on the other side of the road parallel to the street lamp, and the photosensitive element is equipped with a photosensitive device, a power supply device and a communication device;

[0068] The signal receiving unit is arranged in the intelligent street light, and is used for receiving the pulse signal sent by the photosensitive element, and recording the time and source of the pulse signal.

[0069] The pulse recording module is used to analyze the current emitted by the photosensitive element. When it is detected that the current change rate exceeds the threshold, a unit pulse signal is generated, and the pulse signal is sent to the signal receiving device inside the street lamp through a preset antenna. After the pulse signal is sent twice in succession, the receiving records of all pulse signals are arranged in chronological order in the database until the last photosensitive element sends a pulse signal twice in succession for a preset time length, and then the records in the database are output;

[0070] The pulse recording module includes: a signal generating unit and a timing recording unit;

[0071] The signal generating unit is composed of an ammeter, a logic circuit and a pulse generator, which is connected in series with the photosensitive element to detect the current in the photosensitive element. When the current change rate is higher than a threshold, a pulse signal is sent to the corresponding street lamp;

[0072] The time sequence recording unit is used to record all pulse signals in a database and arrange them in time sequence to form a signal data set.

[0073] The model building module is used to calculate the length range of pedestrians passing under street lamps according to the output records of the database, the street lamp interval and the road surface parameters, summarize the output records of multiple street lamps in the master control platform, calculate the projection of each contour point of the pedestrian under the illumination of the street lamp, and establish an analysis model according to the projection of all contour points;

[0074] The model building module includes: a shadow analysis unit, a contour drawing unit and an object shaping unit;

[0075] The shadow analysis unit is used to calculate the time taken by the shadow to enter the street lamp range and leave the street lamp range according to the time when the pulse signal in the signal data set is sent;

[0076] The contour drawing unit is used to calculate the projection area of ​​the shadow at different angles according to the time the shadow takes at different positions;

[0077] The object shaping unit is used to fit the model of the object under the street lamp according to the projection areas at different positions, so as to calculate the height and width of the object.

[0078] The object positioning module is used to calculate the pedestrian's moving speed based on the time when the pulse is received in the output record and the position of the pulse signal source element, and then predict the pedestrian's current position based on the pedestrian's moving speed and the position of the last element that sends two consecutive pulse signals;

[0079] The object positioning module includes: a position analysis unit and a travel speed unit;

[0080] The position analysis unit is used to measure the current position of the pedestrian according to the position of the photosensitive element that last sent a pulse signal;

[0081] The travel speed unit is used to determine the walking speed and walking direction of the pedestrian according to the duration of the pulse signal emitted by two adjacent photosensitive elements.

[0082] The lighting state control module is used to determine the length of the lighting interval based on the forward speed of the object, increase the brightness of all street lamps in the lighting interval in front of the estimated position of the pedestrian, and calculate the light intensity of the pedestrian within the main light moment illumination range of each street lamp, and adjust the street lamp illumination angle according to the light intensity so that the light intensity falling on the highest point of the object remains unchanged.

[0083] The light state control module includes: a brightness adjustment unit, an angle adjustment unit and a light moment measurement unit;

[0084] The brightness adjustment unit is arranged in the street lamp, and comprises a signal receiving device and a variable resistor, and is used to adjust the brightness of the street lamp in front of the pedestrian's walking direction;

[0085] The angle adjustment unit is arranged at the connection between the lampshade and the lamp pole, and is used to adjust the angle of illumination of the street lamp according to the received control signal;

[0086] The optical moment measuring unit is used to calculate the light intensity received by the pedestrian at the location according to the illumination angle and light intensity of the current street lamp.

[0087] like Figure 2 As shown, a smart street lamp control method based on the Internet of Things includes the following steps:

[0088] Step S1. A photosensitive element is arranged at a position parallel to the street lamp on the other side of the road, and another photosensitive element is arranged between two adjacent photosensitive elements, wherein the photosensitive element can change the current emitted by itself according to the light intensity of the street lamp, and all photosensitive elements and street lamps are numbered;

[0089] Step S1 includes:

[0090] Step S11. Number the street lamps on the road, and set a photosensitive element on the other side of the road so that the photosensitive element and the street lamp are located at the same position on both sides of the road. The photosensitive element is equipped with a photosensitive device, a power supply device and a communication device for detecting the brightness of the light irradiated on the element and changing the internal current size according to the detected brightness;

[0091] The set photosensitive elements are recorded as a set {W1, W2, ..., Wn}, where n represents the number of street lamps, n ≥ 3, and Wn represents the photosensitive elements parallel to street lamp n;

[0092] Step S12: Set another photosensitive element at the midpoint of the line connecting two adjacent photosensitive elements, and renumber the newly added photosensitive elements, which are recorded as a set {W (1,2) ,W (2,3) ,…,W (n-1,n)}, where W (n-1,n) Represents the photosensitive element W n-1 and W n A photosensitive element is arranged between them.

[0093] Step S2. Turn on the streetlight and operate it at a constant first brightness. When the rate of change of the current passing through the photosensitive element is higher than the threshold, a pulse signal is sent to the master control, and the master control records the source and occurrence time of the pulse signal;

[0094] Step S2 includes:

[0095] Step S21. Preset the first brightness Q1, turn on the street lamp, make the street lamp illuminate the photosensitive element at the first brightness, and record the current in the photosensitive element;

[0096] Step S22. Construct a function F(t) with time as the independent variable and the current in the photosensitive element as the dependent variable, where t is time, and detect the derivative F of the function F(t) at the current moment. ’ (t0), where t0 is the current time;

[0097] When |F ’ When (t0)|≥a, a unit pulse signal is transmitted to the control center through the communication device in the photosensitive element, where a is the preset change rate threshold;

[0098] Step S23. After receiving the unit pulse signal from the photosensitive element, the control center records the time when the pulse signal is received and the source of the pulse signal in the database.

[0099] Step S3. According to the projection analysis method, the height and average speed of the pedestrian are calculated according to the interval of the pulse signal emitted by each photosensitive element, and the width and travel direction of the pedestrian are obtained from the distance between two adjacent photosensitive elements and the time difference of emitting the pulse signal;

[0100] Step S3 includes:

[0101] Step S31. If two pulse signals sent by the same photosensitive element are recorded in the database, the photosensitive element sending the signal is marked as a target element. When at least three consecutive elements are marked as target elements, step S32 is executed;

[0102] Step S32. Calculate the height of the pedestrian according to the time when the adjacent element sends out a pulse according to the projection analysis method. The projection analysis method is as follows:

[0103] S32-1. The time when the first target element sends a pulse is recorded as ta1, the time when the element sends a pulse again is recorded as ta2, the time when the second target element sends a pulse for the first time is recorded as tb1, the time when the second pulse is sent is recorded as tb2, the time when the third target element sends a pulse for the first time is recorded as tc1, and the time when the second pulse is sent is recorded as tc2;

[0104] S32-2. Calculate the height and average speed of pedestrians using the following formula: Among them, θ represents the horizontal illumination deflection angle, v represents the average walking speed of pedestrians, H represents the height of pedestrians, LS represents the distance between the two photosensitive elements, L represents the horizontal distance between the street lamp and the second target element, and h represents the height of the street lamp;

[0105] Step S33. Calculate the width d of the pedestrian, where d=v·(ta2-ta1), and obtain the direction of travel of the pedestrian based on the order in which the photosensitive elements emit pulses. The direction of travel is the direction from the photosensitive element that emits the pulse first to the photosensitive element that emits the pulse later.

[0106] Step S4. The current position of the user is obtained from the position of the photosensitive element that last emitted a pulse signal, and the user's travel speed is multiplied by the preset lighting time to obtain the lighting interval of the street lamp, and the brightness of all street lamps within the lighting interval in the direction of the user's travel is increased;

[0107] Step S4 includes:

[0108] Step S41. Subtract the current time from the last pulse signal time recorded in the database to obtain the pedestrian's travel time, multiply the pedestrian's travel time by the pedestrian's average walking speed to obtain the travel distance, and extend the travel distance along the road in the direction of travel at the photosensitive element position corresponding to the last pulse signal to obtain the pedestrian's current position;

[0109] Step S42: Calculate the length Z of the lighting interval of the street lamp, where Z=v·r, where r represents the preset lighting time, and increase the brightness of all street lamps in the lighting interval in front of the pedestrian's position.

[0110] Step S5. According to the direct illumination calculation method, the angle of each street lamp when directly shining on the pedestrian is calculated based on the pedestrian position, pedestrian height and street lamp height, recorded as the target angle, and the angle of each street lamp in the illumination range is adjusted so that the direct illumination angle of the street lamp avoids the target angle of all pedestrians on the road.

[0111] Step S5 includes:

[0112] Step S51. According to the direct illumination calculation method, the angle of each street lamp when directly irradiating the pedestrian is calculated based on the pedestrian position, pedestrian height and street lamp height. The direct illumination calculation method is as follows: Among them, ω represents the target angle, t0 represents the current time, and tg represents the time of the last pulse signal recorded in the database;

[0113] Step S52: Calculate the target angle of all pedestrians on the road, and adjust the direct angle of the street lamps within the illumination range so that the direct angle of all street lamps avoids the target angle of the pedestrians.

[0114] Embodiment: There are three street lamps on the road, three photosensitive elements are set opposite the street lamps, and two photosensitive elements are set between the photosensitive elements. At a certain moment, photosensitive element 1 sends a pulse at 10:00 and sends a pulse again at 10:02. The duration of the pulse sent by photosensitive element 2 is 10:05 and 10:08 respectively, and the duration of the pulse sent by photosensitive element 3 is 10:10 and 10:12 respectively. The distance between the street lamps is 5m, and the walking speed of the pedestrian is 0.5m / min. The height of the street lamp is 10m, so the height of the pedestrian is 1.77m. The angle of the street lamp and the brightness of the street lamp in front of the pedestrian are adjusted according to the current position of the pedestrian.

[0115] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0116] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A smart street lamp control method based on the Internet of Things, characterized in that: The method comprises the following steps: Step S1. A photosensitive element is arranged at a position parallel to the street lamp on the other side of the road, and another photosensitive element is arranged between two adjacent photosensitive elements, wherein the photosensitive element can change the current emitted by itself according to the light intensity of the street lamp, and all photosensitive elements and street lamps are numbered; Step S2. Turn on the streetlight and operate it at a constant first brightness. When the rate of change of the current passing through the photosensitive element is higher than the threshold, a pulse signal is sent to the master control, and the master control records the source and occurrence time of the pulse signal; Step S3. According to the projection analysis method, the height and average speed of the pedestrian are calculated according to the interval of the pulse signal emitted by each photosensitive element, and the width and travel direction of the pedestrian are obtained from the distance between two adjacent photosensitive elements and the time difference of emitting the pulse signal; Step S4. The current position of the user is obtained from the position of the photosensitive element that last emitted a pulse signal, and the user's travel speed is multiplied by the preset lighting time to obtain the lighting interval of the street lamp, and the brightness of all street lamps within the lighting interval in the direction of the user's travel is increased; Step S5. According to the direct illumination calculation method, the angle of each street lamp when directly shining on the pedestrian is calculated based on the pedestrian position, pedestrian height and street lamp height, recorded as the target angle, and the angle of each street lamp in the illumination range is adjusted so that the direct illumination angle of the street lamp avoids the target angle of all pedestrians on the road.

2. According to the method of controlling a smart street lamp based on the Internet of Things in claim 1, it is characterized by: Step S1 includes: Step S11. Number the street lamps on the road, and set a photosensitive element on the other side of the road so that the photosensitive element and the street lamp are located at the same position on both sides of the road. The photosensitive element is equipped with a photosensitive device, a power supply device and a communication device for detecting the brightness of the light irradiated on the element and changing the internal current size according to the detected brightness; The set photosensitive elements are recorded as a set {W1, W2, ..., Wn}, where n represents the number of street lamps, n ≥ 3, and Wn represents the photosensitive elements parallel to street lamp n; Step S12: Set another photosensitive element at the midpoint of the line connecting two adjacent photosensitive elements, and renumber the newly added photosensitive elements, which are recorded as a set {W (1,2) ,W (2,3) ,…,W (n-1,n) }, where W (n-1,n) Represents the photosensitive element W n-1 and W n A photosensitive element is arranged between them.

3. According to the method of controlling a smart street lamp based on the Internet of Things as claimed in claim 2, it is characterized by: Step S2 includes: Step S21. Preset the first brightness Q1, turn on the street lamp, make the street lamp illuminate the photosensitive element at the first brightness, and record the current in the photosensitive element; Step S22. Construct a function F(t) with time as the independent variable and the current in the photosensitive element as the dependent variable, where t is time, and detect the derivative F of the function F(t) at the current moment. ’ (t0), where t0 is the current time; When |F ’ When (t0)|≥a, a unit pulse signal is transmitted to the control center through the communication device in the photosensitive element, where a is the preset change rate threshold; Step S23. After receiving the unit pulse signal from the photosensitive element, the control center records the time when the pulse signal is received and the source of the pulse signal in the database.

4. According to claim 3, a smart street lamp control method based on the Internet of Things is characterized in that: Step S3 includes: Step S31. If two pulse signals sent by the same photosensitive element are recorded in the database, the photosensitive element sending the signal is marked as a target element. When at least three consecutive elements are marked as target elements, step S32 is executed; Step S32. Calculate the height of the pedestrian according to the time when the adjacent element sends out a pulse according to the projection analysis method. The projection analysis method is as follows: S32-1. The time when the first target element sends a pulse is recorded as ta1, the time when the element sends a pulse again is recorded as ta2, the time when the second target element sends a pulse for the first time is recorded as tb1, the time when the second pulse is sent is recorded as tb2, the time when the third target element sends a pulse for the first time is recorded as tc1, and the time when the second pulse is sent is recorded as tc2; S32-2. Calculate the height and average speed of pedestrians using the following formula: Among them, θ represents the horizontal illumination deflection angle, v represents the average walking speed of pedestrians, H represents the height of pedestrians, LS represents the distance between the two photosensitive elements, L represents the horizontal distance between the street lamp and the second target element, and h represents the height of the street lamp; Step S33. Calculate the width d of the pedestrian, where d=v·(ta2-ta1), and obtain the direction of travel of the pedestrian based on the order in which the photosensitive elements emit pulses. The direction of travel is the direction from the photosensitive element that emits the pulse first to the photosensitive element that emits the pulse later.

5. The method for controlling a smart street lamp based on the Internet of Things according to claim 4 is characterized in that: Step S4 includes: Step S41. Subtract the current time from the last pulse signal time recorded in the database to obtain the pedestrian's travel time, multiply the pedestrian's travel time by the pedestrian's average walking speed to obtain the travel distance, and extend the travel distance along the road in the direction of travel at the photosensitive element position corresponding to the last pulse signal to obtain the pedestrian's current position; Step S42. Calculate the length Z of the lighting interval of the street lamp, where Z=v·r, where r represents the preset lighting time, and increase the brightness of all street lamps in the lighting interval in front of the pedestrian's position; Step S5 includes: Step S51. According to the direct illumination calculation method, the angle of each street lamp when directly irradiating the pedestrian is calculated based on the pedestrian position, pedestrian height and street lamp height. The direct illumination calculation method is as follows: Among them, ω represents the target angle, t0 represents the current time, and tg represents the time of the last pulse signal recorded in the database; Step S52: Calculate the target angle of all pedestrians on the road, and adjust the direct angle of the street lamps within the illumination range so that the direct angle of all street lamps avoids the target angle of the pedestrians.

6. A smart street light control system based on the Internet of Things, characterized in that: The system includes the following modules: parallel photosensing module, pulse recording module, model building module, object positioning module and light state control module; The parallel photosensitive module is composed of a photosensitive element arranged at a position parallel to the road surface on the other side of the street lamp and a signal receiving device inside the street lamp. The photosensitive element is used to receive the light irradiated by the street lamp with a constant brightness and generate current according to the intensity of the received light. The signal receiving device is used to receive the pulse signal emitted by the photosensitive element and record the source and occurrence time of the pulse signal in the database. The pulse recording module is used to analyze the current emitted by the photosensitive element. When it is detected that the current change rate exceeds the threshold, a unit pulse signal is generated, and the pulse signal is sent to the signal receiving device inside the street lamp through a preset antenna. After the pulse signal is sent twice in succession, the reception records of all pulse signals are arranged in chronological order in the database until the last photosensitive element sends a pulse signal twice in succession for a preset time, and then the records in the database are output; The model building module is used to calculate the length range of pedestrians passing under street lamps according to the output records of the database, the street lamp interval and the road surface parameters, summarize the output records of multiple street lamps in the master control platform, calculate the projection of each contour point of the pedestrian under the illumination of the street lamp, and establish an analysis model according to the projection of all contour points; The object positioning module is used to calculate the pedestrian's moving speed based on the time when the pulse is received in the output record and the position of the pulse signal source element, and then predict the pedestrian's current position based on the pedestrian's moving speed and the position of the last element that sends two consecutive pulse signals; The lighting state control module is used to determine the length of the lighting interval based on the forward speed of the object, increase the brightness of all street lamps in the lighting interval in front of the estimated position of the pedestrian, and calculate the light intensity of the pedestrian within the main light moment illumination range of each street lamp, and adjust the street lamp illumination angle according to the light intensity so that the light intensity falling on the highest point of the object remains unchanged.

7. The smart street light control system based on the Internet of Things according to claim 6 is characterized by: The parallel photosensitive module comprises: a component setting unit and a signal receiving unit; The element setting unit is used to set the photosensitive element on the other side of the road parallel to the street lamp, and the photosensitive element is equipped with a photosensitive device, a power supply device and a communication device; The signal receiving unit is arranged in the intelligent street light, and is used to receive the pulse signal sent by the photosensitive element, and record the time and source of the pulse signal; The pulse recording module includes: a signal generating unit and a timing recording unit; The signal generating unit is composed of an ammeter, a logic circuit and a pulse generator, which is connected in series with the photosensitive element to detect the current in the photosensitive element. When the current change rate is higher than a threshold, a pulse signal is sent to the corresponding street lamp; The time sequence recording unit is used to record all pulse signals in a database and arrange them in time sequence to form a signal data set.

8. The smart street light control system based on the Internet of Things according to claim 7 is characterized in that: The model building module includes: a shadow analysis unit, a contour drawing unit and an object shaping unit; The shadow analysis unit is used to calculate the time taken by the shadow to enter the street lamp range and leave the street lamp range according to the time when the pulse signal in the signal data set is sent; The contour drawing unit is used to calculate the projection area of ​​the shadow at different angles according to the time the shadow takes at different positions; The object shaping unit is used to fit the model of the object under the street lamp according to the projection areas at different positions, so as to calculate the height and width of the object.

9. The smart street light control system based on the Internet of Things according to claim 8 is characterized in that: The object positioning module includes: a position analysis unit and a travel speed unit; The position analysis unit is used to measure the current position of the pedestrian according to the position of the photosensitive element that last sent a pulse signal; The travel speed unit is used to determine the walking speed and walking direction of the pedestrian according to the duration of the pulse signal emitted by two adjacent photosensitive elements.

10. The smart street light control system based on the Internet of Things according to claim 9, characterized in that: The light state control module includes: a brightness adjustment unit, an angle adjustment unit and a light moment measurement unit; The brightness adjustment unit is arranged in the street lamp, and comprises a signal receiving device and a variable resistor, and is used to adjust the brightness of the street lamp in front of the pedestrian's walking direction; The angle adjustment unit is arranged at the connection between the lampshade and the lamp pole, and is used to adjust the angle of illumination of the street lamp according to the received control signal; The optical moment measuring unit is used to calculate the light intensity received by the pedestrian at the location according to the illumination angle and light intensity of the current street lamp.

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