A lighting control system and method

Abstract

The application belongs to the field of intelligent lighting control, and particularly relates to a lighting control system and method. The system collects and records the light intensity of the lighting device according to a preset time period through a light intensity collection module, and obtains a light intensity deviation value through a deviation value calculation module. Then, the system obtains an output proportional control value and an output integral control value through a proportional control value module and an integral control value module, respectively, and obtains an output adjustment control value through a control value adjustment module. Finally, the system obtains a target output duty cycle according to the output adjustment control value through a duty cycle adjustment module, and adjusts the output duty cycle for controlling the light intensity of the lighting device, so as to improve the stability of the light emission of the lighting device.

Description

Technical Field

[0001] This invention belongs to the field of intelligent lighting control, specifically relating to a lighting control system and method. Background Technology

[0002] Road lighting plays a vital role in people's normal work and daily life. However, due to various potential factors, such as the natural aging of electronic components in lighting equipment and circuit instability, lighting equipment often exhibits unstable brightness, specifically fluctuating between high and low levels. This phenomenon not only seriously affects the travel experience of road users 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 brightness instability. Therefore, developing an intelligent lighting control system capable of monitoring light intensity in real time and automatically adjusting lighting brightness to maintain a constant light intensity is particularly important. Summary of the Invention

[0004] To overcome the shortcomings of existing lighting systems, this invention proposes a lighting control system and method. This system integrates advanced functional modules such as light intensity acquisition, deviation calculation, proportional-integral control, and duty cycle adjustment to achieve precise control and stable output of lighting brightness.

[0005] To achieve the above objectives, the present invention adopts the following solution:

[0006] In a first aspect, the present invention provides a lighting control system, the system comprising:

[0007] 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 the real-time light intensity value.

[0008] The deviation value calculation module receives the real-time light intensity value from the light intensity acquisition module, calculates and outputs the difference between the target light intensity value and the real-time light intensity value to obtain the light intensity deviation value;

[0009] The proportional control quantity module receives the light intensity deviation value from the deviation value calculation module and outputs the proportional control quantity according to the proportional control weight.

[0010] The integral control quantity module receives the light intensity deviation value from the deviation value calculation module and outputs the integral control quantity according to the integral control weight.

[0011] The control quantity adjustment module receives the proportional control quantity from the proportional control quantity module and the integral control quantity from the integral control quantity module, and is used to adjust and output the adjustment control quantity.

[0012] The duty cycle adjustment module receives the output adjustment control quantity from the control quantity adjustment module, obtains the target output duty cycle based on the output duty cycle, and adjusts the output duty cycle accordingly.

[0013] Preferably, the light intensity acquisition module specifically includes:

[0014] A timer is used to provide the light intensity value acquisition cycle;

[0015] A photoelectric sensor is used to convert light intensity values ​​into electrical signals.

[0016] An analog-to-digital converter is used to quantize and convert the electrical signal of a photoelectric sensor into a digital signal to obtain the real-time light intensity value.

[0017] Preferably, the integral control quantity module specifically includes:

[0018] The first weighting module is used to find and output the first weighted value;

[0019] The second weighting module is used to find and output the second weighting value;

[0020] The deviation integral value calculation module receives the first weighted value output by the first weighting module and the second weighted value output by the second weighting module, and updates the light intensity deviation integral value according to the light intensity deviation value and the current light intensity deviation integral value.

[0021] Preferably, the control quantity adjustment module specifically includes:

[0022] An adjustment accumulator is used to accumulate the proportional control quantity and the integral control quantity to obtain the adjustment control quantity;

[0023] A light intensity threshold generator is used to generate an adjustment threshold based on the real-time light intensity value.

[0024] The adjustment amount limiting module is used to adjust the adjustment control amount according to the adjustment amount threshold.

[0025] Preferably, the duty cycle adjustment module specifically includes:

[0026] A duty cycle threshold generator is used to generate an upper limit value for the output duty cycle based on the target light intensity value.

[0027] The output duty cycle limiting module is used to adjust the output duty cycle based on the upper and lower limits of the output duty cycle.

[0028] Preferably, the duty cycle threshold generator specifically includes:

[0029] The standard brightness parameter module is used to obtain the duty cycle unit adjustment amount based on the lifespan of the lighting equipment;

[0030] The duty cycle threshold calculation module receives the acquisition period of the light intensity acquisition module and the duty cycle unit adjustment amount of the standard brightness parameter module to obtain the upper limit value of the duty cycle.

[0031] Preferably, the intelligent lighting control system further includes:

[0032] A dimming fitter is used to fit a dimming curve based on the real-time light intensity value and the output duty cycle.

[0033] Preferably, the intelligent lighting control system further includes:

[0034] The duty cycle threshold adjuster is used to obtain the duty cycle threshold according to the dimming curve and the reference light intensity value, and then adjust the upper limit of the duty cycle according to the relationship between the duty cycle threshold and the upper limit of the duty cycle.

[0035] Preferably, the intelligent lighting control system further includes:

[0036] A proportional control weight adjuster is used to obtain an estimated light intensity value based on the output duty cycle according to the dimming curve; and then update the proportional control weight value based on the estimated light intensity value.

[0037] Preferably, the intelligent lighting control system further includes:

[0038] An integral control weight adjuster is used to obtain an estimated light intensity value based on the output duty cycle according to the dimming curve; and then update the integral control weight value based on the estimated light intensity value.

[0039] In a second aspect, the present invention provides a lighting control method, comprising the following specific steps:

[0040] The light intensity value is converted into an electrical signal to obtain the real-time light intensity value;

[0041] 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;

[0042] Based on the light intensity deviation value, and according to the proportional control weight, the proportional control quantity is output;

[0043] Based on the light intensity deviation value, and according to the integral control weight, the integral control quantity is output;

[0044] Based on the proportional control quantity and the integral control quantity, adjust and output the regulating control quantity;

[0045] Based on the output adjustment control quantity, the target output duty cycle is obtained according to the output duty cycle, and the output duty cycle is adjusted.

[0046] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0047] The system first collects and records the luminous intensity of the lighting equipment through the light intensity acquisition module according to a preset time period, and then obtains the light intensity deviation value through the deviation value calculation module. Next, the proportional control module and the integral control module obtain the output proportional control value and the output integral control value, respectively, which are used to obtain the output adjustment control value through the control value adjustment module. Finally, the duty cycle adjustment module obtains the target output duty cycle based on the output adjustment control value, which is used to adjust the output duty cycle that controls the luminous brightness of the lighting equipment, thereby improving the stability of the luminous emission of the lighting equipment. Attached Figure Description

[0048] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0049] Figure 1 This is a block diagram of a preferred high-efficiency flicker-free intelligent lighting control system according to the present invention;

[0050] Figure 2 This is a block diagram of a preferred light intensity acquisition module of the present invention;

[0051] Figure 3 This is a block diagram of a preferred integral control quantity module of the present invention;

[0052] Figure 4 This is a block diagram of a preferred control quantity adjustment module of the present invention;

[0053] Figure 5 This is a block diagram of a preferred duty cycle adjustment module of the present invention;

[0054] Figure 6 This is a flowchart of a lighting control method according to an embodiment of the present invention. Detailed Implementation

[0055] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0056] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0057] Example 1

[0058] This invention provides a lighting control system, the system comprising:

[0059] The light intensity acquisition module is used to convert light intensity values ​​into electrical signals to obtain real-time light intensity values;

[0060] The deviation value calculation module receives the real-time light intensity value from the light intensity acquisition module, calculates and outputs the difference between the target light intensity value and the real-time light intensity value to obtain the light intensity deviation value;

[0061] The proportional control quantity module receives the light intensity deviation value from the deviation value calculation module and outputs the proportional control quantity according to the proportional control weight.

[0062] The integral control quantity module receives the light intensity deviation value from the deviation value calculation module and outputs the integral control quantity according to the integral control weight.

[0063] The control quantity adjustment module receives the proportional control quantity from the proportional control quantity module and the integral control quantity from the integral control quantity module, and is used to adjust and output the adjustment control quantity.

[0064] The duty cycle adjustment module receives the output adjustment control quantity from the control quantity adjustment module, obtains the target output duty cycle based on the output duty cycle, and adjusts the output duty cycle accordingly.

[0065] Figure 1 A block diagram of a high-efficiency, flicker-free intelligent lighting control system according to the present invention is shown.

[0066] See Figure 1 As shown, a preferred embodiment of the present invention is a high-efficiency flicker-free intelligent lighting control system, comprising: 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 ​​to obtain real-time light intensity values; a deviation value calculation module 102 for receiving the real-time light intensity values ​​from the light intensity acquisition module, calculating and outputting the difference between the target light intensity value and the real-time light intensity value to obtain a light intensity deviation value; a proportional control quantity module 103 for receiving the light intensity deviation value from the deviation value calculation module, and outputting a proportional control quantity according to a proportional control weight; an integral control quantity module 104 for receiving the light intensity deviation value from the deviation value calculation module, and outputting an integral control quantity according to an integral control weight; a control quantity adjustment module 105 for receiving the proportional control quantity from the proportional control quantity module and the integral control quantity from the integral control quantity module, for adjusting and outputting an adjustment control quantity; and a duty cycle adjustment module 106 for receiving the output adjustment control quantity from the control quantity adjustment module, obtaining a target output duty cycle based on the output duty cycle, and adjusting the output duty cycle.

[0067] The light intensity acquisition module is installed on the urban lighting equipment and is used to periodically collect the luminous intensity of the lighting equipment at preset time intervals. A photoelectric sensor converts the luminous intensity into an electrical signal. In practical applications, an analog-to-digital converter converts this electrical signal into an analog-to-digital conversion value to represent the real-time luminous intensity of the urban lighting equipment.

[0068] The deviation value calculation module compares the target light intensity value of the urban lighting equipment with the real-time light intensity value, 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 amount of light intensity adjustment required for the real-time light intensity value of the lighting equipment.

[0069] The proportional control quantity module and the integral control quantity module are used to calculate the two control adjustment quantities in this embodiment;

[0070] The proportional control module calculates and outputs the proportional control quantity based on the proportional control weight and the light intensity deviation value. The proportional control weight can affect the light intensity oscillation amplitude during the light intensity adjustment process.

[0071] The integral control quantity module calculates and outputs the integral control quantity based on the integral control weight and 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.

[0072] The control quantity adjustment module accumulates the output proportional control quantity and the output integral control quantity, and performs a limit judgment on the accumulation result according to the limit rule, so as to adjust the output regulation control quantity.

[0073] The duty cycle adjustment module calculates the target output duty cycle based on the output duty cycle and the output adjustment control quantity, and then adjusts the target output duty cycle according to the limiting rules to adjust the output duty cycle and achieve the effect of adjusting the light intensity.

[0074] This invention determines the adjustment control quantity by measuring the light intensity deviation, thereby improving the accuracy of the adjustment control. Furthermore, based on the adjustment quantity limit and the output duty cycle limit, the amplitude of the light intensity adjustment is reduced to avoid flickering of urban lighting equipment caused by excessive light intensity changes, thereby improving the travel experience of road traffic participants.

[0075] Please refer to Figure 2 The diagram below shows a block diagram of a light intensity acquisition module provided in an embodiment of the present invention. 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 from the photoelectric sensor into a digital signal to obtain a real-time light intensity value. The timer outputs a timing flag bit according to set timing parameters to limit the time period for the light intensity acquisition module to convert and output the real-time light intensity value.

[0076] As an optional implementation, the adjustment time for the luminous intensity of urban lighting equipment is the same as the acquisition time to ensure the sensitivity of the adjustment.

[0077] As an alternative implementation, the adjustment time for the luminous intensity of the urban lighting equipment is at least twice the acquisition time, in order to reduce the number of adjustments and lower power consumption during the adjustment process. The aforementioned photoelectric sensor is a device that uses the photoelectric conversion principle to convert light signals into electrical signals. In this embodiment, the photoelectric sensor converts the light signals emitted by the urban lighting equipment into electrical signals. The analog-to-digital converter converts the electrical signals output by the photoelectric sensor into digital signals, visually representing the real-time luminous intensity value of the urban lighting equipment in a digitally quantized manner.

[0078] Figure 3 The block diagram of the integral control quantity module provided in a preferred embodiment of the present invention includes: a first weighting module 301 for finding and outputting a first weighted value; a second weighting module 302 for finding and outputting a second weighted value; and a deviation integral value calculation module 303, which receives the first weighted value output by the first weighting module and the second weighted value output by the second weighting module, and updates the light intensity deviation integral value according to the light intensity deviation value and the current light intensity deviation integral value.

[0079] It should be noted that the integral value of the deviation is calculated using the following formula:

[0080] ERR n = A1 * ERR + A2 * ERR (n-1) ;

[0081] Among them, ERR n A1 is the integral value of the deviation in this round of calculation; A2 is the first weighted value of the first weighting module; ERR is the light intensity deviation value; ERR (n-1) This is the integral value of the deviation from the previous calculation, which is the current integral value of the light intensity deviation.

[0082] In this embodiment, the light intensity deviation integral value is a weighted sum of the light intensity deviation values ​​calculated from each acquisition. In practical applications, the first and second weighting values ​​are typically both 0.5. According to the formula above, when the light intensity deviation value is large, the light intensity deviation integral value is large or shows an upward trend; when the light intensity deviation value is small, the light intensity deviation integral value is small or approaches the light intensity deviation value. By accumulating the deviation integral value, the relationship between the current adjustment and past adjustments is strengthened, thereby improving the stability of the adjustment.

[0083] Please refer to the following: Figure 4This is a block diagram of the 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 the proportional control quantity and the integral control quantity to obtain the adjustment control quantity; a light intensity threshold generator 402, used to generate an adjustment quantity threshold based on the real-time light intensity value; and an adjustment quantity limiting module 403, used to adjust the adjustment control quantity based on the adjustment quantity threshold.

[0084] The adjustment accumulator accumulates the proportional control quantity and the integral control quantity to obtain the adjustment control quantity, including but not limited to direct addition and weighted addition. The light intensity threshold generator generates an adjustment threshold based on the real-time light intensity value. When the adjustment quantity exceeds the threshold, it indicates excessive light intensity variation, causing flickering in the city lighting. In this embodiment, the adjustment threshold is related to the real-time light intensity value and is obtained by looking up a stored adjustment quantity mapping table. The adjustment limiting module is a limiter; when the adjustment control quantity exceeds the adjustment threshold, the adjustment control quantity is limited to the adjustment threshold.

[0085] Figure 5 A block diagram of a duty cycle adjustment module provided in an embodiment of the present invention is shown. This duty cycle adjustment module specifically includes: a duty cycle threshold generator 501, used to generate an upper limit value for the output duty cycle based on a target light intensity value; and an output duty cycle limiting module 502, used to adjust the output duty cycle based on the upper limit value and the lower limit value. The duty cycle threshold generator generates the upper limit value for the output duty cycle based on the target light intensity value. Since the output duty cycle can directly adjust the light emission, an upper limit value for the output duty cycle is set based on the target light intensity value to avoid excessively high light intensity values ​​during dimming. Similarly, a lower limit value for the output duty cycle is also set to avoid excessively low light intensity values ​​during dimming. The output duty cycle limiting module adjusts the output duty cycle based on the upper and lower limits to prevent the output duty cycle from exceeding the adjustable range.

[0086] According to an embodiment of the present invention, the duty cycle threshold generator specifically includes: a standard brightness parameter module, used to obtain the duty cycle unit adjustment amount based on the lifespan of the lighting equipment; and a duty cycle threshold calculation module, which receives the acquisition period of the light intensity acquisition module and the duty cycle unit adjustment amount from 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 duty cycle unit adjustment amount, which is the maximum allowable adjustment amplitude of the duty cycle within a unit time period. Utilizing the visual persistence phenomenon of the human visual system, typically 0.1 to 0.4 seconds, by setting the dimming range within a unit time period, visual flickering sensations for pedestrians or drivers during dimming are avoided. The duty cycle threshold calculation module is used to calculate and output the upper limit value of the duty cycle based on the timing acquisition period of the timer of the light intensity acquisition module and the duty cycle unit adjustment amount.

[0087] According to an embodiment of the present invention, the present invention further includes a dimming fitter for fitting a dimming curve based on the real-time light intensity value and the output duty cycle.

[0088] It should be noted that the luminous intensity values ​​emitted by urban lighting equipment after adjusting the output duty cycle are used to construct dimming coordinate points, along with the output duty cycle itself. As one optional implementation, the dimming coordinate points are plotted with the output duty cycle as the abscissa and the luminous intensity value as the ordinate, resulting in a dimming coordinate graph. A fitting curve is then plotted based on the dimming coordinate graph to obtain a dimming fitting curve. As another optional implementation, the dimming fitting curve is calculated based on the dimming coordinate points using the least squares curve fitting formula. The dimming fitting curve reflects the actual dimming situation of the current urban lighting equipment.

[0089] According to an embodiment of the present invention, the present invention further includes: a duty cycle threshold adjuster, used to obtain a duty cycle threshold according to a dimming curve and a reference light intensity value, and then adjust the upper limit of the duty cycle according to the relationship between the duty cycle threshold and the upper limit of the duty cycle.

[0090] It should be noted that due to the aging of electronic components, especially the gradual change in electrical characteristics of light sources in urban lighting equipment over time, the output value of the standard brightness parameter module cannot accurately reflect the usage status of every urban lighting device. This embodiment reflects the real-time operating status of urban lighting equipment through a dimming curve and obtains the duty cycle threshold based on the reference luminous intensity value; then it determines whether the upper limit of the duty cycle exceeds the duty cycle threshold. If so, the upper limit of the duty cycle is limited to the duty cycle threshold.

[0091] According to an embodiment of the present invention, the system further includes: a proportional control weight adjuster, configured to obtain an estimated light intensity value based on the output duty cycle according to the dimming curve; and then update the proportional control weight based on the estimated light intensity value. It should be noted that since the proportional weight directly affects the light intensity deviation value, the proportional control weight can influence the light intensity oscillation amplitude during the light intensity adjustment process. To improve dimming stability, this embodiment adopts a method of updating the proportional control weight in real time based on the estimated light intensity value to reduce the light intensity oscillation amplitude during the dimming process.

[0092] According to an embodiment of the present invention, the system further includes: an integral control weight adjuster, configured to obtain an estimated light intensity value based on the output duty cycle according to the dimming curve; and then update the integral control weight value based on the estimated light intensity value. It should be noted that since the integral weight value acts on the integral value of the light intensity deviation, the integral control weight value can adjust the oscillation frequency of the light intensity during the light intensity modulation process. To improve dimming efficiency, this embodiment adopts a method of updating the integral control weight value in real time based on the estimated light intensity value, thereby improving dimming efficiency.

[0093] This embodiment of the invention may further include a timing regulator that adjusts the timing clock of the timer of the light intensity acquisition module based on the change in the output duty cycle. Since triggering light intensity acquisition, calculating the adjustment amount, and adjusting the output duty cycle all involve calculation and switching actions, leading to increased computing power and power consumption, this embodiment uses the change in the output duty cycle to reflect whether the output duty cycle stabilizes the luminous intensity of the urban lighting equipment at the set target luminous intensity value. If so, it indicates that the luminous intensity adjustment has reached a stable state, allowing for a reduction in the dimming frequency, i.e., extending the timing clock. This embodiment uses a timing regulator to adjust the timing clock of the timer of the light intensity acquisition module, thereby adjusting the dimming frequency and achieving the goal of reducing computing power consumption and power consumption.

[0094] The high-efficiency, flicker-free intelligent lighting control system provided by this invention first collects and records the luminous intensity of the lighting equipment according to a preset time period through a light intensity acquisition module, and then obtains the light intensity deviation value through a deviation value calculation module. Next, the proportional control module and the integral control module obtain the output proportional control value and the output integral control value, respectively, which are used to obtain the output adjustment control value through the control value adjustment module. Finally, the duty cycle adjustment module obtains the target output duty cycle based on the output adjustment control value, which is used to adjust the output duty cycle that controls the luminous brightness of the lighting equipment, thereby improving the stability of the lighting equipment's luminous emission.

[0095] Example 2

[0096] like Figure 6 As shown, a high-efficiency, flicker-free intelligent lighting control method, based on the system implementation of Embodiment 1 above, includes the following specific steps:

[0097] S1. Convert the light intensity value into an electrical signal to obtain the real-time light intensity value;

[0098] 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;

[0099] S3. Based on the light intensity deviation value, output the proportional control quantity according to the proportional control weight; based on the light intensity deviation value, output the integral control quantity according to the integral control weight.

[0100] S5. Based on the proportional control quantity and the integral control quantity, adjust and output the adjustment control quantity;

[0101] S6. Based on the output adjustment control quantity, obtain the target output duty cycle according to the output duty cycle, and adjust the output duty cycle.

[0102] The above method, by monitoring light intensity in real time and automatically adjusting the output duty cycle, ensures that lighting equipment provides stable light intensity output under various conditions, avoiding the brightness fluctuations common in traditional lighting systems. Flicker is a common problem in lighting equipment, causing discomfort and fatigue to the human eye; this method achieves flicker-free lighting.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do 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 includes: The light intensity acquisition module is used to obtain real-time light intensity values; The 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 based on the real-time light intensity value, so as to obtain the light intensity deviation value; The proportional control module is used to output a proportional control quantity based on the light intensity deviation value and the proportional control weight. The integral control quantity module is used to output the integral control quantity based on the light intensity deviation value and the integral control weight value; A control quantity adjustment module is used to adjust and output an adjustment control quantity based on the proportional control quantity and the integral control quantity; The duty cycle adjustment module is used to determine the output duty cycle based on the adjustment control quantity, and obtain the target output duty cycle. The integral control quantity module specifically includes: The first weighting module is used to find and output the first weighted value; The second weighting module is used to find and output the second weighting value; The deviation integral value calculation module receives the first weighted value output by the first weighting module and the second weighted value output by the second weighting module, and updates the light intensity deviation integral value according to the light intensity deviation value and the current light intensity deviation integral value. The specific method for updating the light intensity deviation integral value in the deviation integral value calculation module is as follows: ERRn ​​= A1*ERR + A2*ERR(n-1); where ERRn ​​is the deviation integral value in the current round of calculation; A1 is the first weighted value of the first weighting module; A2 is the second weighted value of the second weighting module; ERR is the light intensity deviation value; and ERR(n-1) is the deviation integral value in the previous round of calculation, i.e., the current light intensity deviation integral value. The control quantity adjustment module specifically includes: an adjustment quantity accumulator, used to accumulate the proportional control quantity and the integral control quantity to obtain the adjustment control quantity; a light intensity threshold generator, used to generate the adjustment quantity threshold based on the real-time light intensity value; and an adjustment quantity limiting module, used to adjust the adjustment control quantity based on the adjustment quantity threshold. The duty cycle adjustment module specifically includes: a duty cycle threshold generator, used to generate an upper limit value for the output duty cycle based on the target light intensity value; and an output duty cycle limiting module, used to adjust the output duty cycle based on the upper limit value and the lower limit value of the output duty cycle. The duty cycle threshold generator specifically includes: a standard brightness parameter module, used to obtain the duty cycle unit adjustment amount based on the lifespan of the lighting equipment; and a duty cycle threshold calculation module, which receives the acquisition period of the light intensity acquisition module and the duty cycle unit adjustment amount of the standard brightness parameter module to obtain the upper limit value of the duty cycle. The system also includes: A dimming fitter is used to fit a dimming curve based on real-time light intensity and output duty cycle. The duty cycle threshold adjuster is used to obtain the duty cycle threshold according to the dimming curve and the reference light intensity value, and then adjust the upper limit of the duty cycle according to the relationship between the duty cycle threshold and the upper limit of the duty cycle. The proportional control weight adjuster is used to obtain the light intensity estimate based on the output duty cycle according to the dimming curve; and then update the proportional control weight based on the light intensity estimate. The integral control weight adjuster is used to obtain the light intensity estimate based on the output duty cycle according to the dimming curve; and then update the integral control weight based on the light intensity estimate. The timing regulator adjusts the timing clock of the light intensity acquisition module based on the change in the output duty cycle.

2. A lighting control method, implemented based on the lighting control system of claim 1, characterized in that, The specific steps include the following: The light intensity value is converted 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 according to the proportional control weight, the proportional control quantity is output; Based on the light intensity deviation value, and according to the integral control weight, the integral control quantity is output; Based on the proportional control quantity and the integral control quantity, adjust and output the regulating control quantity; Based on the output adjustment control quantity, the target output duty cycle is obtained according to the output duty cycle, and the output duty cycle is adjusted.

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