Illumination control system and method

Abstract

The invention belongs to the field of intelligent lighting control, and particularly relates to a lighting control system and method. The system collects and records the luminous intensity of the lighting equipment according to a preset time period through a light intensity collection module, and then obtains a light intensity deviation value through a deviation value calculation module; then, an output proportional control quantity and an output integral control quantity are respectively obtained through a proportional control quantity module and an integral control quantity module, and are used for obtaining an output adjustment control quantity through a control quantity adjustment module; and finally, a target output duty ratio is obtained through a duty ratio adjusting module according to the output adjustment control quantity, and the target output duty ratio is used for adjusting and controlling the output duty ratio of the luminance of the lighting equipment. Therefore, the lighting stability of the lighting equipment is improved.

Description

Technical Field

[0001] The present invention belongs to the field of intelligent lighting control, and in particular relates to a lighting control system and method. Background Art

[0002] Road lighting plays a vital role in people's normal work and life. However, due to a variety of potential factors, such as the natural aging of electronic components of lighting equipment and the instability of circuits, lighting equipment often has unstable brightness, which is manifested as high and low brightness. This phenomenon not only seriously affects the travel experience of road traffic participants, but also poses a potential threat to road traffic safety.

[0003] Traditional lighting control systems often lack effective light intensity monitoring and adjustment mechanisms, making it difficult to respond to changes in light intensity in a timely and accurate manner, thus failing to effectively avoid the problem of unstable brightness. Therefore, it is particularly important to develop an intelligent lighting control system that can monitor light intensity in real time and automatically adjust lighting brightness to maintain a constant light intensity. Summary of the invention

[0004] In order to overcome the defects of the existing lighting system, the present invention proposes a lighting control system and method. The system achieves precise control and stable output of lighting brightness by integrating advanced light intensity acquisition, deviation calculation, proportional-integral control and duty cycle adjustment functional modules.

[0005] To achieve the above object, the present invention adopts the following scheme: In a first aspect, the present invention provides a lighting control system, the system comprising: The light intensity acquisition module is used to convert the light intensity value into an electrical signal and store it in the form of a voltage value or an analog-to-digital conversion value to obtain a real-time light intensity value; a deviation value calculation module, receiving the real-time light intensity value from the light intensity acquisition module, calculating and outputting the difference between the target light intensity value and the real-time light intensity value, and obtaining a light intensity deviation value; A proportional control amount module receives the light intensity deviation value from the deviation value calculation module and outputs a proportional control amount according to a proportional control weight; An integral control amount module receives the light intensity deviation value from the deviation value calculation module and outputs an integral control amount according to the integral control weight; A control amount adjustment module receives the proportional control amount from the proportional control amount module and the integral control amount from the integral control amount module, and is used to adjust and output a regulation control amount; The duty cycle adjustment module receives the output regulation control amount from the control amount adjustment module, and obtains a target output duty cycle according to the output duty cycle, so as to adjust the output duty cycle.

[0006] Preferably, the light intensity collection module specifically includes: A timer is used to provide a light intensity value collection cycle; Photoelectric sensor, used to convert light intensity value into electrical signal; The analog-to-digital converter is used to quantify the electrical signal of the photoelectric sensor into a digital signal to obtain the real-time light intensity value.

[0007] Preferably, the integral control amount module specifically includes: A first weighting module, used for searching and outputting a first weighting value; A second weighting module, used for searching and outputting a second weighting value; The deviation integral value calculation module receives the first weighted value output by the first weighted module and the second weighted value output by the second weighted module, and updates the light intensity deviation integral value according to the light intensity deviation value and the current light intensity deviation integral value.

[0008] Preferably, the control amount adjustment module specifically includes: An adjustment amount accumulator, used for accumulating the proportional control amount and the integral control amount to obtain an adjustment control amount; A light intensity threshold generator, used to generate an adjustment amount threshold according to the real-time light intensity value; The regulating amount limiting module is used to adjust the regulating control amount according to the regulating amount threshold.

[0009] Preferably, the duty cycle adjustment module specifically includes: A duty cycle threshold generator, used to generate an output duty cycle upper limit value according to the target light intensity value; The output duty cycle limiting module is used to adjust the output duty cycle according to the output duty cycle upper limit value and the output duty cycle lower limit value.

[0010] Preferably, the duty cycle threshold generator specifically includes: Standard brightness parameter module, used to obtain duty cycle unit adjustment amount according to the service life of lighting equipment; The duty cycle threshold calculation module receives the collection period of the light intensity collection module and the duty cycle unit adjustment amount of the standard brightness parameter module to obtain the duty cycle upper limit value.

[0011] Preferably, the intelligent lighting control system further comprises: A dimming fitter is used to fit a dimming curve according to the real-time light intensity value and the output duty cycle.

[0012] Preferably, the intelligent lighting control system further comprises: The duty cycle threshold regulator is used to obtain the duty cycle threshold according to the dimming curve and the reference light intensity value, and then adjust the duty cycle upper limit value according to the size relationship between the duty cycle threshold value and the duty cycle upper limit value.

[0013] Preferably, the intelligent lighting control system further comprises: A proportional control weight regulator is used to obtain a light intensity estimation value according to the dimming curve and the output duty cycle; and then update the proportional control weight value according to the light intensity estimation value.

[0014] Preferably, the intelligent lighting control system further comprises: The integral control weight regulator is used to obtain the light intensity estimation value according to the dimming curve and the output duty cycle; and then update the integral control weight value according to the light intensity estimation value.

[0015] A second aspect of the present invention provides a lighting control method, comprising the following specific steps: Convert the light intensity value into an electrical signal to obtain the real-time light intensity value; Based on the real-time light intensity value, the difference between the target light intensity value and the real-time light intensity value is calculated and output to obtain the light intensity deviation value; Based on the light intensity deviation value and the proportional control weight, the proportional control amount is output; Based on the light intensity deviation value and the integral control weight, the integral control amount is output; Based on the proportional control amount and the integral control amount, adjusting and outputting the regulating control amount; Based on the output regulation control amount and according to the output duty cycle, a target output duty cycle is obtained, and the output duty cycle is adjusted.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The system first collects and records the luminous intensity of the lighting equipment according to a preset time period through the light intensity acquisition module, and then obtains the light intensity deviation value through the deviation value calculation module; then obtains the output proportional control quantity and the output integral control quantity through the proportional control quantity module and the integral control quantity module respectively, which are used to obtain the output adjustment control quantity through the control quantity adjustment module; finally, the duty cycle adjustment module obtains the target output duty cycle according to the output adjustment control quantity, which is used to adjust the output duty cycle of the lighting equipment to control the luminous brightness, thereby improving the luminous stability of the lighting equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1A block diagram of a high-efficiency, flicker-free intelligent lighting control system preferred by the present invention; Figure 2 This is a block diagram of a preferred light intensity acquisition module of the present invention; Figure 3 The block diagram of the preferred integral control quantity module of the present invention; Figure 4 A block diagram of a preferred control amount adjustment module of the present invention; Figure 5 A block diagram of a duty cycle adjustment module preferred in the present invention; Figure 6 The present invention is a flowchart of a lighting control method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0019] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit exemplary embodiments according to the present invention.

[0020] Example 1 The present invention provides a lighting control system, the system comprising: Light intensity acquisition module, used to convert light intensity value into electrical signal to obtain real-time light intensity value; a deviation value calculation module, receiving the real-time light intensity value from the light intensity acquisition module, calculating and outputting the difference between the target light intensity value and the real-time light intensity value, and obtaining a light intensity deviation value; A proportional control amount module receives the light intensity deviation value from the deviation value calculation module and outputs a proportional control amount according to a proportional control weight; An integral control amount module receives the light intensity deviation value from the deviation value calculation module and outputs an integral control amount according to the integral control weight; A control amount adjustment module receives the proportional control amount from the proportional control amount module and the integral control amount from the integral control amount module, and is used to adjust and output a regulation control amount; The duty cycle adjustment module receives the output regulation control amount from the control amount adjustment module, and obtains a target output duty cycle according to the output duty cycle, so as to adjust the output duty cycle.

[0021] Figure 1The block diagram of a high-efficiency flicker-free intelligent lighting control system of the present invention is shown.

[0022] See also Figure 1 As shown, a preferred high-efficiency and flicker-free intelligent lighting control system of the present invention includes: a light intensity acquisition module 101 for converting light intensity values ​​into electrical signals, storing them in the form of voltage values ​​or analog-to-digital conversion values, and obtaining real-time light intensity values; a deviation value calculation module 102, receiving the real-time light intensity value from the light intensity acquisition module, calculating and outputting the difference between the target light intensity value and the real-time light intensity value, and obtaining the light intensity deviation value; a proportional control amount module 103, receiving the light intensity deviation value from the deviation value calculation module, and outputting the proportional control amount according to the proportional control weight; an integral control amount module 104, receiving the light intensity deviation value from the deviation value calculation module, and outputting the integral control amount according to the integral control weight; a control amount adjustment module 105, receiving the proportional control amount from the proportional control amount module and the integral control amount from the integral control amount module, and used to adjust and output the adjustment control amount; a duty cycle adjustment module 106, receiving the output adjustment control amount from the control amount adjustment module, and obtaining the target output duty cycle according to the output duty cycle, and used to adjust the output duty cycle.

[0023] The light intensity acquisition module is arranged on the urban lighting equipment, and is used to periodically acquire the luminous brightness of the lighting equipment according to a preset time, and convert the luminous brightness into an electrical signal through a photoelectric sensor. In practical applications, the electrical signal is converted into an analog-to-digital conversion value through an analog-to-digital converter to represent the real-time light intensity value of the luminous light of the urban lighting equipment.

[0024] The deviation value calculation module compares the real-time light intensity value with the target light intensity value of the set urban lighting equipment, and calculates the difference between the target light intensity value and the real-time light intensity value to obtain the light intensity deviation value, which is used to represent the luminous intensity adjustment required for the real-time luminous intensity value of the lighting equipment.

[0025] The proportional control amount module and the integral control amount module are used to calculate the two control adjustment amounts in this embodiment; The proportional control amount module calculates and outputs the proportional control amount according to the proportional control weight and the light intensity deviation value, and the proportional control weight can affect the light intensity oscillation amplitude in the light intensity adjustment process; The integral control amount module calculates and outputs the integral control amount according to the integral control weight and the integral value of the light intensity deviation value, and the integral control weight can adjust the oscillation frequency of the light intensity during the light intensity adjustment process.

[0026] The control quantity adjustment module accumulates the output proportional control quantity and the output integral control quantity, and performs a limit judgment on the accumulated result according to the limit rule to adjust the output regulation control quantity.

[0027] The duty cycle adjustment module calculates the target output duty cycle according to the output duty cycle and the output regulation control amount, and then adjusts the target output duty cycle according to the limiting rule to adjust the output duty cycle and achieve the effect of adjusting the luminous intensity.

[0028] The present invention determines the adjustment control amount through the light intensity deviation, thereby improving the accuracy of the adjustment control; and then reduces the amplitude of the light intensity adjustment span according to the adjustment amount limit and the output duty cycle limit, so as to avoid flickering of urban lighting equipment caused by excessive changes in light intensity, thereby improving the travel experience of road traffic participants.

[0029] Please refer to Figure 2 , is a block diagram of a light intensity acquisition module provided in an embodiment of the present invention, and the light intensity acquisition module specifically includes: a timer 201 for providing a light intensity value acquisition period; a photoelectric sensor 202 for converting the light intensity value into an electrical signal; and an analog-to-digital converter 203 for quantizing and converting the electrical signal of the photoelectric sensor into a digital signal to obtain a real-time light intensity value. The above-mentioned timer outputs a timing flag according to a set timing parameter, which is used to limit the time period for the light intensity acquisition module to convert and output the real-time light intensity value.

[0030] As an optional implementation, the adjustment time of the light intensity of the urban lighting equipment is the same as the collection time to ensure the sensitivity of the adjustment.

[0031] As another optional implementation, the adjustment time of the light intensity of the urban lighting equipment is at least twice the acquisition time, so as to reduce the number of adjustments and reduce the power consumption during the adjustment process. The aforementioned photoelectric sensor is a device that converts an optical signal into an electrical signal using the principle of photoelectric conversion. In this embodiment, the photoelectric sensor converts the optical signal of the urban lighting equipment into an electrical signal. The analog-to-digital converter converts the electrical signal output by the photoelectric sensor into a digital signal, which intuitively reflects the real-time light intensity value of the urban lighting equipment in a digital quantified manner.

[0032] Figure 3 A block diagram of an integral control module provided for a preferred embodiment of the present invention, the integral control module specifically includes: a first weighting module 301 for searching and outputting a first weighting value; a second weighting module 302 for searching and outputting a second weighting value; and a deviation integral value calculation module 303, the deviation integral value calculation module receiving the first weighting value output by the first weighting module and the second weighting value output by the second weighting module, and updating the light intensity deviation integral value according to the light intensity deviation value and the current light intensity deviation integral value.

[0033] It should be noted that the deviation integral value is calculated using the following formula: ERR n = A1 * ERR + A2 * ERR (n-1) ; Among them, ERR n is the deviation integral value in this round of calculation; A1 is the first weighted value of the first weighted module; A2 is the second weighted value of the second weighted module; ERR is the light intensity deviation value; ERR (n-1) It is the deviation integral value in the previous round of calculation, that is, the current light intensity deviation integral value.

[0034] In this embodiment, the light intensity deviation integral value is a weighted summation operation of the light intensity deviation values ​​obtained by each acquisition calculation. In practical applications, the first weighted value and the second weighted value are usually calculated as 0.5. According to the above formula, when the light intensity deviation value is at a larger value, the light intensity deviation integral value result is larger or shows an upward growth trend; when the light intensity deviation value is at a smaller value, the light intensity deviation integral value result is smaller or approaches the light intensity deviation value. By accumulating the deviation integral value, the relationship between the current adjustment amount and the past adjustment amount is strengthened, thereby improving the stability of the adjustment.

[0035] Please refer to Figure 4 , is a block diagram of a control quantity adjustment module provided in an embodiment of the present invention, the control quantity adjustment module specifically includes: an adjustment quantity accumulator 401, used to accumulate a proportional control quantity and an integral control quantity to obtain an adjustment control quantity; a light intensity threshold generator 402, used to generate an adjustment quantity threshold according to a real-time light intensity value; an adjustment quantity limiting module 403, used to adjust the adjustment control quantity according to the adjustment quantity threshold.

[0036] Among them, the adjustment amount accumulator accumulates the proportional control amount and the integral control amount to obtain the adjustment control amount, including but not limited to direct addition and weighted addition. The light intensity threshold generator generates the adjustment amount threshold according to the real-time light intensity value. When the adjustment amount exceeds the adjustment threshold, it indicates that there is a large change in light intensity, resulting in flickering of urban lighting. Among them, in this embodiment, the size of the adjustment amount threshold is related to the size of the real-time light intensity value, and is obtained by looking up the table according to the stored adjustment amount corresponding table. The adjustment amount limiting module is a limiter, that is, when the adjustment control amount exceeds the adjustment amount threshold, the size of the adjustment control amount will be limited to the adjustment amount threshold.

[0037] Figure 5The block diagram of the duty cycle adjustment module provided by the embodiment of the present invention is shown, and the duty cycle adjustment module specifically includes: a duty cycle threshold value generator 501, which is used to generate an output duty cycle upper limit value according to a target light intensity value; an output duty cycle limiting module 502, which is used to adjust the output duty cycle according to the output duty cycle upper limit value and the output duty cycle lower limit value. Among them, the duty cycle threshold value generator generates an output duty cycle upper limit value according to the target light intensity value. Since the output duty cycle can directly adjust the luminous condition, in order to avoid the luminous intensity value being too high during the dimming process, the output duty cycle upper limit value is set according to the target light intensity value. Similarly, in order to avoid the luminous intensity value being too low during the dimming process, an output duty cycle lower limit value is also set. The output duty cycle limiting module adjusts the output duty cycle according to the output duty cycle upper limit value and the output duty cycle lower limit value to prevent the output duty cycle from exceeding the adjustable space.

[0038] According to an embodiment of the present invention, the duty cycle threshold generator specifically includes: a standard brightness parameter module, which is used to obtain a unit adjustment amount of the duty cycle according to the service life of the lighting equipment; a duty cycle threshold calculation module, which receives the collection period of the light intensity collection module and the unit adjustment amount of the duty cycle of the standard brightness parameter module to obtain the upper limit value of the duty cycle. The standard brightness parameter module is used to obtain the unit adjustment amount of the duty cycle, that is, the maximum amplitude allowed for the duty cycle to be adjusted within a unit time period. The visual retention phenomenon of the human visual system is utilized, which is usually 0.1 to 0.4 seconds. By setting the dimming range within a unit time, pedestrians or motor vehicle drivers are prevented from having a visual flickering feeling during the dimming process. The duty cycle threshold calculation module is used to calculate and output the upper limit value of the duty cycle according to the duty cycle unit adjustment amount based on the timed collection period of the timer of the light intensity collection module.

[0039] According to an embodiment of the present invention, the present invention further comprises a dimming fitter, which is used to fit a dimming curve according to the real-time light intensity value and the output duty cycle.

[0040] It should be noted that the light intensity value of the urban lighting equipment collected after adjusting the output duty cycle and the output duty cycle constitute the dimming coordinate point. As an optional implementation, the dimming coordinate point is plotted with the output duty cycle as the horizontal coordinate and the light intensity value as the vertical coordinate to obtain a dimming coordinate diagram; then a fitting curve is plotted according to the dimming coordinate diagram to obtain a dimming fitting curve. As another optional implementation, the dimming fitting curve is calculated according to the dimming coordinate points according to the least squares method and other curve fitting formulas. The dimming fitting curve reflects the actual dimming situation of the current urban lighting equipment.

[0041] According to an embodiment of the present invention, the present invention also includes: a duty cycle threshold adjuster, which is used to obtain a duty cycle threshold according to a reference light intensity value according to a dimming curve, and then adjust the duty cycle upper limit value according to the relationship between the duty cycle threshold value and the duty cycle upper limit value.

[0042] It should be noted that due to the aging of electronic devices, especially the gradual change of electrical characteristics of the light source of urban lighting equipment as the use time increases, the output value of the standard brightness parameter module cannot fit the use status of every urban lighting equipment. This embodiment reflects the real-time working status of urban lighting equipment through the dimming curve, obtains the duty cycle threshold value according to the reference light intensity value; then determines whether the duty cycle upper limit value exceeds the duty cycle threshold value, and if so, limits the size of the duty cycle upper limit value to the duty cycle threshold value.

[0043] According to an embodiment of the present invention, it also includes: a proportional control weight adjuster, which is used to obtain a light intensity estimation value according to the output duty cycle according to the dimming curve; and then update the proportional control weight according to the light intensity estimation value. It should be noted that since the proportional weight directly acts on the light intensity deviation value, the proportional control weight can affect the light intensity oscillation amplitude during the light intensity adjustment process. In order to improve the dimming stability, this embodiment adopts a method of updating the proportional control weight in real time according to the light intensity estimation value to reduce the light intensity oscillation amplitude during the dimming process.

[0044] According to an embodiment of the present invention, it also includes: an integral control weight regulator, which is used to obtain a light intensity estimation value according to the output duty cycle according to the dimming curve; and then update the integral control weight according to the light intensity estimation value. It should be noted that since the integral weight acts on the integral value of the light intensity deviation, the integral control weight can adjust the oscillation frequency of the light intensity during the light intensity adjustment process. In order to improve the dimming efficiency, this embodiment adopts a method of updating the integral control weight in real time according to the light intensity estimation value to improve the dimming efficiency.

[0045] The embodiment of the present invention may further include a timing regulator, which adjusts the timing clock of the timer of the light intensity acquisition module according to the change value of the output duty cycle. Since triggering light intensity acquisition, adjusting amount calculation and adjusting the output duty cycle will cause calculation actions and switching actions, resulting in an increase in computing power and power consumption. Therefore, in this embodiment, the change in the output duty cycle reflects whether the output duty cycle stabilizes the luminous intensity of the urban lighting equipment at the set target light intensity value. If so, it means that the light intensity regulation is already in a stable state, allowing the dimming frequency to be reduced, that is, the timing clock is extended. This embodiment adjusts the timing clock of the timer of the light intensity acquisition module through the timing regulator, thereby adjusting the dimming frequency and achieving the purpose of reducing computing power consumption and power consumption.

[0046] The high-efficiency flicker-free intelligent lighting control system provided by the present invention first collects and records the luminous intensity of the lighting equipment according to a preset time period through a light intensity collection module, and then obtains the light intensity deviation value through a deviation value calculation module; then, the output proportional control amount and the output integral control amount are obtained respectively through a proportional control amount module and an integral control amount module, which are used to obtain the output regulation control amount through a control amount adjustment module; finally, the target output duty cycle is obtained according to the output regulation control amount through a duty cycle adjustment module, which is used to adjust the output duty cycle of controlling the luminous brightness of the lighting equipment; thereby improving the luminous stability of the lighting equipment.

[0047] Example 2 like Figure 6 As shown, a high-efficiency and flicker-free intelligent lighting control method is implemented based on the system of the above embodiment 1. The method includes the following specific steps: S1, convert the light intensity value into an electrical signal to obtain the real-time light intensity value; S2. Based on the real-time light intensity value, calculate and output the difference between the target light intensity value and the real-time light intensity value to obtain the light intensity deviation value; S3, based on the light intensity deviation value, according to the proportional control weight, output the proportional control amount; based on the light intensity deviation value, according to the integral control weight, output the integral control amount; S5. Based on the proportional control amount and the integral control amount, adjust and output the regulation control amount; S6. Based on the output regulation control amount and the output duty cycle, a target output duty cycle is obtained, and the output duty cycle is adjusted.

[0048] The above method can ensure that the lighting equipment can provide stable light intensity output under various conditions by monitoring the light intensity in real time and automatically adjusting the output duty cycle, avoiding the phenomenon of high and low brightness commonly seen in traditional lighting systems. Flicker is a common problem in lighting equipment, which can cause discomfort and fatigue to the human eye. This method achieves flicker-free lighting.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A lighting control system, characterized in that: The system comprises: Light intensity acquisition module, used to obtain real-time light intensity value; A deviation value calculation module is used to calculate and output the difference between the target light intensity value and the real-time light intensity value according to the real-time light intensity value to obtain a light intensity deviation value; A proportional control quantity module is used to output a proportional control quantity according to a light intensity deviation value and a proportional control weight; An integral control quantity module is used to output an integral control quantity according to a light intensity deviation value and an integral control weight; A control amount adjustment module, used for adjusting and outputting a regulation control amount according to the proportional control amount and the integral control amount; The duty cycle adjustment module is used to determine the output duty cycle according to the adjustment control amount to obtain the target output duty cycle.

2. A lighting control system according to claim 1, characterized in that: The integral control amount module specifically includes: A first weighting module, used for searching and outputting a first weighting value; A second weighting module, used for searching and outputting a second weighting value; The deviation integral value calculation module receives the first weighted value output by the first weighted module and the second weighted value output by the second weighted module, and updates the light intensity deviation integral value according to the light intensity deviation value and the current light intensity deviation integral value.

3. A lighting control system according to claim 1, characterized in that: The control amount adjustment module specifically includes: An adjustment amount accumulator, used for accumulating the proportional control amount and the integral control amount to obtain an adjustment control amount; A light intensity threshold generator, used to generate an adjustment amount threshold according to the real-time light intensity value; The regulating amount limiting module is used to adjust the regulating control amount according to the regulating amount threshold.

4. A lighting control system according to claim 1, characterized in that: The duty cycle adjustment module specifically includes: A duty cycle threshold generator, used to generate an output duty cycle upper limit value according to the target light intensity value; The output duty cycle limiting module is used to adjust the output duty cycle according to the output duty cycle upper limit value and the output duty cycle lower limit value.

5. A lighting control system according to claim 4, characterized in that: The duty cycle threshold generator specifically includes: Standard brightness parameter module, used to obtain duty cycle unit adjustment amount according to the service life of lighting equipment; The duty cycle threshold calculation module receives the collection period of the light intensity collection module and the duty cycle unit adjustment amount of the standard brightness parameter module to obtain the duty cycle upper limit value.

6. A lighting control system according to claim 1, characterized in that: Also includes: A dimming fitter is used to fit a dimming curve according to the real-time light intensity value and the output duty cycle.

7. A lighting control system according to claim 6, characterized in that: Also includes: The duty cycle threshold regulator is used to obtain the duty cycle threshold according to the dimming curve and the reference light intensity value, and then adjust the duty cycle upper limit value according to the size relationship between the duty cycle threshold value and the duty cycle upper limit value.

8. A lighting control system according to claim 6, characterized in that: Also includes: A proportional control weight regulator, used to obtain a light intensity estimation value according to the output duty cycle in accordance with the dimming curve; Then, the proportional control weight is updated according to the light intensity estimation value.

9. A lighting control system according to claim 6, characterized in that: Also includes: An integral control weight regulator, used to obtain a light intensity estimation value according to the output duty cycle in accordance with the dimming curve; Then, the integral control weight is updated according to the light intensity estimation value.

10. A lighting control method, characterized in that: The specific steps include: Convert the light intensity value into an electrical signal to obtain the real-time light intensity value; Based on the real-time light intensity value, the difference between the target light intensity value and the real-time light intensity value is calculated and output to obtain the light intensity deviation value; Based on the light intensity deviation value and the proportional control weight, the proportional control amount is output; Based on the light intensity deviation value and the integral control weight, the integral control amount is output; Based on the proportional control amount and the integral control amount, adjusting and outputting the regulating control amount; Based on the output regulation control amount and according to the output duty cycle, a target output duty cycle is obtained, and the output duty cycle is adjusted.

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