A self-dimming control system for high-speed rail passenger compartment lighting

Abstract

The present invention discloses a self-dimming control system for high-speed rail passenger compartment lighting, and relates to the technical field of high-speed rail passenger compartment electric lighting. The components of the system include: a passenger flow monitoring module, a central control module, a lighting partition module, and a memory and storage module. The present invention continuously optimizes the lighting strategy through the central control module according to the changing trend of passenger flow and the personalized lighting settings of each area, so as to realize the precise allocation of lighting resources. When the number of passengers in an area decreases, the system automatically reduces the lighting brightness of the area, thereby avoiding unnecessary energy waste. At the same time, the system also has a memory function, and can identify the preference settings of different passengers. When a passenger enters the same area again, the previous personalized lighting settings are automatically called out, and the passenger does not need to readjust. In addition, the constant current driving technology adopted by the present invention can ensure that the lamp works stably under different input voltages and dimming states, thereby extending the life of the lamp.

Description

Technical Field

[0001] The invention relates to the technical field of electric lighting in high-speed rail passenger compartments, and in particular to a self-dimming control system for lighting in high-speed rail passenger compartments. Background Art

[0002] In the modern transportation system, high-speed rail has become an important choice for people's travel due to its high efficiency and convenience. With the continuous development of high-speed rail technology, passengers' requirements for high-speed rail riding experience are also increasing. Passenger compartment lighting is one of the key factors affecting passenger comfort. A good lighting environment can not only provide passengers with a comfortable visual experience, but also help relieve travel fatigue and improve the overall travel experience. Therefore, the development of advanced high-speed rail passenger compartment lighting systems to meet the needs of passengers in different scenarios has become an important research direction for high-speed rail electric lighting.

[0003] However, in terms of intelligent dimming, the existing system of the common high-speed rail passenger compartment lighting system adopts a fixed brightness mode and a simple manual adjustment method. When the train runs in different time periods and weather conditions, and the passenger flow in the passenger compartment changes, it is impossible to automatically adjust the lighting brightness according to the actual situation, resulting in a waste of lighting resources or insufficient lighting. In addition, in terms of personalized settings, the existing technology is difficult to meet the diverse needs of passengers. Different passengers have different requirements for lighting brightness and color temperature in different states such as reading, resting, and working, but the existing system cannot provide personalized lighting solutions, cannot recognize and remember passengers' preference settings, and affects the passengers' riding experience.

[0004] In summary, the existing high-speed rail passenger compartment lighting system has obvious limitations when facing complex and changeable passenger needs and operating environment. In order to improve the quality of high-speed rail services and meet the growing needs of passengers, there is an urgent need for a new high-speed rail passenger compartment lighting self-dimming control system that can realize intelligent dimming and provide personalized lighting solutions. Summary of the invention

[0005] The purpose of the present invention is to make up for the deficiencies of the prior art and to provide a high-speed rail passenger compartment lighting self-dimming control system, which can continuously optimize the lighting strategy through the central control module according to the changing trend of passenger flow and the personalized lighting settings of each area, and realize the precise allocation of lighting resources. When the number of passengers in an area decreases, the system automatically reduces the lighting brightness of the area to avoid unnecessary energy waste. At the same time, the system also has a memory function and can recognize the preference settings of different passengers. When a passenger enters the same area again, the previous personalized lighting settings are automatically called out without the need for the passenger to readjust, thereby further improving energy utilization efficiency. In addition, the constant current drive technology adopted in the present invention can ensure that the LED lamps can operate stably under different input voltages and dimming states, extend the life of the lamps, and reduce maintenance costs, thereby achieving a balance between energy saving and passenger comfort.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a self-dimming control system for high-speed rail passenger compartment lighting, the components of which include: a passenger flow monitoring module, a central control module, a lighting partition module, and a memory and storage module;

[0007] The passenger flow monitoring module installs human infrared sensors in the business cars, aisles and passenger compartments of the high-speed rail to form a comprehensive passenger flow monitoring network. Through the high-speed rail passenger compartment Wi-Fi network, it monitors the changes in passenger flow in each area in real time and transmits the data to the central control module.

[0008] The central control module receives and analyzes the passenger flow data fed back by the human infrared sensor, sends instructions to the control unit according to the passenger distribution, realizes the intelligent adjustment of the lighting brightness, and continuously optimizes the lighting strategy according to the passenger flow change trend and the personalized lighting settings of each area;

[0009] The lighting partition module sets the business car and ordinary car to dynamic lighting mode, and the aisle to static lighting mode. The dynamic lighting mode is managed by partition according to the real-time passenger distribution in the car. Each partition is independent of each other. Each partition is equipped with an independent dimming module and control unit. The static lighting mode is set to a constant light mode. The central control module directly adjusts the brightness and color temperature through a dedicated control line to ensure the stability and continuity of the aisle lighting.

[0010] The memory and storage module is used to store the instructions of the central control module and the lighting parameters of the dimming module and the control unit, and has a memory function. The passenger sets the brightness and color temperature within the partition through the communication interface. When the passenger enters the same area again, the corresponding personalized lighting settings are automatically called out.

[0011] Furthermore, the central control module includes a data processor and a decision engine, the data processor is responsible for receiving data from the passenger flow monitoring module and performing preliminary processing on the data, including removing noise and correcting deviation;

[0012] The decision engine analyzes the processed data to determine the lighting adjustment strategy and sends instructions to the control unit.

[0013] Furthermore, after receiving and analyzing the passenger flow data, the decision engine sends instructions to the control unit according to the passenger distribution situation. The specific process is as follows: the decision engine calculates the passenger density of each area based on the passenger flow data of each area. , the calculation process is: ,in, is the number of passengers in the area, is the area of ​​the region, based on the passenger density Adjustment relationship with lighting brightness to determine the target lighting brightness of each area , the regulation relationship is expressed as , is the basic lighting brightness, and is the lighting constant, which is used to adjust the sensitivity of brightness to changes in passenger density. The central control module sets the target lighting brightness The value is converted into the corresponding dimming instruction and sent to the control unit behind each partition of the lighting partition module to realize intelligent adjustment of the lighting brightness.

[0014] Furthermore, the lighting partition module receives the passenger density data of each area transmitted by the central control module in real time through the communication interface, and calculates the passenger density of each area. After normalization, we get , so that its value falls within the interval [0, 1], and partition management is performed. The specific process of the partition is:

[0015] Initialize the number of partitions , preset the maximum number of partitions according to the carriage layout and lighting requirements;

[0016] All areas according to Sort from high to low;

[0017] Starting from the highest ranked area as the starting area of ​​partition 1, the adjacent areas are examined in turn. Average with the current partition The difference is less than the density threshold , the adjacent area is included in the current partition and the average value of the current partition is updated. ;

[0018] Repeat the above process until the current partition cannot be expanded further and the maximum number of partitions is reached. , calculate the compactness of each partition , compactness is measured by the ratio of the area to the perimeter of the partition, where:

[0019] when , then the partition With adjacent partitions Merge, the compactness of the new partition after the merger satisfies: and ,in It represents the compactness threshold of the partition. Compactness is an indicator to measure the regularity of the regional shape, which is used to ensure that each partition has a certain degree of coherence and regularity in space.

[0020] Furthermore, the dimming module adopts LED driving technology, which can finely adjust the light brightness and color temperature, and the control unit is responsible for receiving instructions from the central control system and controlling the working state of the dimming module.

[0021] Furthermore, the LED driving technology in the dimming module adopts a constant current driving method. The working principle of the constant current driving circuit is to stabilize the output current by controlling the on and off time of the power switch tube. The working process is: input voltage After rectification and filtering, it enters the pulse width modulation PWM control chip. The PWM control chip adjusts the duty cycle D of the output pulse according to the dimming signal value transmitted by the central control module, and sets the conduction time of the power switch tube to , the off time is , switching period T = + , then the duty cycle D = / T, by changing the duty cycle D, adjusting the on and off state of the power switch tube, and then controlling the energy storage and release process of the inductor L, so that the output current Keep constant, during this process, the output current With input voltage , inductance L and duty cycle D always maintain: ,in This constant current driving mode ensures that the LED lamps can work stably under different input voltages and dimming conditions.

[0022] Furthermore, the data interaction process between the central control module and the memory and storage module is as follows: when a passenger makes personalized lighting settings, the central control module encrypts the setting information to ensure data security, and sends the encrypted information to the memory and storage module. After receiving the information, the memory and storage module stores the information in corresponding locations according to different partitions. When reading the passenger's preference settings, the memory and storage module reads the encrypted information from the corresponding location according to the request sent by the central control module, and sends it back to the central control module. The central control module decrypts the received information to obtain the original personalized lighting setting information for controlling the lighting system.

[0023] Compared with the prior art, this high-speed rail passenger compartment lighting self-dimming control system has the following beneficial effects:

[0024] 1. The present invention continuously optimizes the lighting strategy and realizes the precise allocation of lighting resources through the central control module according to the changing trend of passenger flow and the personalized lighting settings of each area. When the number of passengers in an area decreases, the system automatically reduces the lighting brightness of the area to avoid unnecessary energy waste. At the same time, the system also has a memory function and can recognize the preference settings of different passengers. When a passenger enters the same area again, the previous personalized lighting settings are automatically called out without the need for the passenger to readjust, thereby further improving the energy utilization efficiency. In addition, the constant current drive technology adopted by the present invention can ensure that the LED lamps work stably under different input voltages and dimming conditions, extend the life of the lamps, and reduce maintenance costs, thereby achieving a balance between energy saving effects and passenger comfort.

[0025] 2. The personalized lighting function of the present invention greatly improves the riding experience of passengers. Passengers can personalize the lighting brightness and color temperature of the area where they are located to meet the needs of different scenarios such as reading, resting, and working. The memory and storage module can recognize the preference settings of different passengers and automatically call up the corresponding settings when the passenger enters the same area again without the need for readjustment, creating a comfortable, convenient, and personalized lighting environment for passengers, effectively improving the satisfaction and competitiveness of high-speed rail services.

[0026] Other advantages, objectives and features of the present invention will be set forth in part in the following description and, in part, will be apparent to those skilled in the art based on an examination of the following or may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is an operation flow chart of a self-dimming control system for high-speed rail passenger compartment lighting;

[0029] Figure 2 The figure is a block diagram of a self-dimming control system for high-speed rail passenger compartment lighting. DETAILED DESCRIPTION

[0030] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0031] Embodiment 1

[0032] This embodiment describes in detail the operation process of a high-speed rail passenger compartment lighting self-dimming control system, which integrates a passenger flow monitoring module, a central control module, a lighting partition module, and a memory and storage module. Figure 1 As shown in the figure, through the coordinated work of various modules, the function of intelligently adjusting the lighting according to passenger flow and personalized needs is realized. The human infrared sensor is used to monitor the passenger flow, the central control module issues instructions, the lighting partition module executes the dimming operation, and the memory and storage module saves and calls the personalized settings. At the same time, the constant current drive technology is used to ensure the stable operation of the LED lamps, ultimately achieving the purpose of energy saving and improving passenger comfort.

[0033] In the business car, aisle and ordinary car cabin of the high-speed rail, the passenger flow monitoring module is responsible for obtaining passenger distribution information in real time. It uses human infrared sensors to collect real-time passenger flow data in the carriages and aisles to form a comprehensive monitoring network. The human infrared sensor works on the principle of pyroelectric effect. When a passenger enters its monitoring range, the infrared rays emitted by the human body will be received by the pyroelectric element in the sensor. After absorbing the infrared energy, the temperature of the pyroelectric element changes, which in turn produces a charge change. This charge change is converted into an electrical signal. In order to ensure that the collected data is accurate and reliable, the sensor also integrates signal amplification and filtering circuits. The amplification circuit amplifies the weak electrical signal so that it can be processed by subsequent circuits. The filtering circuit removes noise interference in the signal and improves data quality. The processed electrical signal is transmitted to the central control module in real time in digital form through the high-speed rail cabin Wi-Fi network. During the transmission process, the timeliness and stability of the data are guaranteed.

[0034] The central control module receives data from the passenger flow monitoring module, analyzes and processes it, and decides on the adjustment strategy of the lighting system. The module includes a data processor and a decision engine. The data processor first performs preliminary processing on the received passenger flow data. Due to various interference factors in the actual environment, the data may have noise and deviation. The data processor corrects or removes abnormal data points that exceed the normal range to remove noise. At the same time, the data deviation is corrected to ensure the accuracy of the data. The data after preliminary processing is transmitted to the decision engine. The decision engine performs in-depth analysis on the data to determine the lighting adjustment strategy. During the analysis process, the decision engine calculates the passenger density based on the passenger flow data of each area. By collecting the number of passengers in the area, the decision engine calculates the number of passengers in the area. , the area is , then the passenger density The calculation formula is The significance of the formula is to obtain an index that can reflect the density of people in the area by quantifying the relationship between the number of passengers and the area, which provides a basis for the subsequent adjustment of lighting brightness. The decision engine is based on the passenger density. Adjustment relationship with lighting brightness to determine the target lighting brightness of each area The regulatory relationship is expressed as ,in The basic lighting brightness is a basic brightness value set under standard conditions to ensure that passengers can get enough light under normal circumstances. and is the lighting constant used to adjust the sensitivity of brightness to changes in passenger density, Determines the magnitude of lighting brightness changes when passenger density changes. is a compensation value used to fine-tune the brightness in different scenarios. For example, in a business car, you may want the lighting brightness to be more sensitive to changes in passenger density, so you can increase In the ordinary carriage near the rest area, in order to avoid frequent changes in brightness affecting passengers' rest, the value can be appropriately reduced. value, and adjust The value of the basic brightness is used to ensure the rationality of the basic brightness. The decision engine calculates the target lighting brightness The value is converted into the corresponding dimming instruction and sent to the control unit behind each partition of the lighting partition module. During the conversion process, the decision engine will take into account the working characteristics of the control unit and the dimming module to ensure that the instruction can be executed accurately.

[0035] The lighting partition module sets different lighting modes according to the type of carriage. Business cars and ordinary cars use dynamic lighting mode, and aisles use static lighting mode. In the dynamic lighting mode, the lighting partition module first receives the passenger density data of each area transmitted by the central control module in real time through the communication interface. In order to facilitate the subsequent partition management, the passenger density of each area needs to be After normalization, we get , so that its value falls within the interval [0, 1]. The purpose of normalization is to unify passenger density data of different ranges into a standard interval, which makes it easier to compare and analyze. The specific process of the partition management is as follows: First, according to the car layout and lighting requirements, the number of partitions is initialized. The layout of the carriage will affect the distribution of passengers, such as the arrangement of seats and the location of aisles. The lighting requirements are determined according to the functions of different areas. For example, the reading area may require higher brightness, while the rest area requires lower brightness. By comprehensively considering these factors, a reasonable maximum number of partitions is preset; then, all areas are divided into Sort from high to low, so that the areas with higher passenger density can be zoned first, because these areas usually have more urgent needs for lighting. Start with the area with the highest ranking and use it as the starting area of ​​zone 1, then examine the adjacent areas in turn. Average with the current partition The difference is less than the density threshold , the adjacent area is included in the current partition and the average value of the current partition is updated. , density threshold is a preset value used to control the degree of partition merging. If it is set larger, the partitions will be relatively small and large in area; if If the value is set smaller, the partitions will be more detailed, but the number may increase. Repeat the above process until the current partition cannot be expanded further or the maximum number of partitions is reached. , at this point, it is necessary to calculate the compactness of each partition , compactness is measured by the ratio of the area to the perimeter of the partition, i.e. ,in represents the area of ​​the partition, represents the perimeter of the partition. Compactness is an indicator to measure the regularity of the regional shape, which is used to ensure that each partition has a certain degree of coherence and regularity in space. ,in represents the compactness threshold of the partition, then the partition With adjacent partitions Merge, the compactness of the new partition after the merger needs to meet and This can ensure that the merged partitions are more regular in shape, avoiding overly narrow or irregular partitions that affect the lighting effect. Each partition is equipped with an independent dimming module and control unit. The control unit is responsible for receiving the dimming instructions sent by the central control module and controlling the working state of the dimming module according to the instructions. In the static lighting mode, the aisle is set to the constant light mode, and the central control module directly adjusts the brightness and color temperature through a dedicated control line. This can ensure the stability and continuity of the aisle lighting and provide reliable lighting conditions for passengers walking in the car.

[0036] The dimming module adopts LED driving technology, which can finely adjust the brightness and color temperature of the light. In this embodiment, the dimming module adopts a constant current driving method to ensure that the LED lamp can work stably under different input voltages and dimming states. The working principle of the constant current driving circuit is to stabilize the output current by controlling the on and off time of the power switch tube. After rectification and filtering, it enters the pulse width modulation PWM control chip. The PWM control chip adjusts the duty cycle of the output pulse according to the dimming signal value sent by the central control module. , assuming that the conduction time of the power switch tube is , the off time is , switching cycle , then the duty cycle , by changing the duty cycle , can adjust the on and off state of the power switch tube, thereby controlling the inductance The energy storage and release process, in this process, the output current With input voltage ,inductance And duty cycle Always keep relationship, among which is the switching frequency. In this way, the output current can be guaranteed regardless of the input voltage fluctuations. Maintain constant, thereby stabilizing the brightness and color temperature of LED lamps, extending the life of lamps and reducing maintenance costs.

[0037] The memory and storage module is used to store the instructions of the central control module and the lighting parameters of the dimming module and the control unit, and has a memory function. The working principle of the memory function is: when the passenger sets the brightness and color temperature in the partition through the communication interface (the control panel on the seat or the personal mobile device connected to the Wi-Fi in the high-speed rail passenger compartment), the central control module will encrypt the personalized setting information. The encryption process is to ensure data security and prevent the information from being stolen or tampered with during transmission and storage. The encrypted information is sent to the memory and storage module. After receiving the information, the memory and storage module stores the information in the corresponding position according to different partitions. In this way, when it is necessary to read the passenger preference settings, the memory and storage module can quickly and accurately find the corresponding data. When the central control module sends a read request, the memory and storage module reads the encrypted information from the corresponding position and sends it back to the central control module. The central control module decrypts the received information to obtain the original personalized lighting setting information, and sends the original personalized lighting setting information to the partition management for controlling the lighting system. In this way, when the passenger enters the same area again, the system can automatically call out the previous personalized lighting settings without the passenger having to readjust them, which provides great convenience for the passengers.

[0038] To sum up, in this embodiment, a high-speed rail passenger compartment lighting self-dimming control system realizes efficient, intelligent and personalized lighting adjustment functions through the close cooperation of various modules. The passenger flow monitoring module uses human infrared sensors to provide the system with accurate passenger distribution data. The central control module relies on the data processor and decision engine to process and analyze the data to generate reasonable dimming instructions. The lighting zoning module sets the lighting mode according to different car types, and performs dimming operations through scientific zoning management and independent dimming modules and control units. The dimming module uses constant current drive technology to ensure the stable operation of LED lamps, and the memory and storage module is responsible for saving and calling personalized lighting settings. The entire system not only realizes the precise allocation of lighting resources and avoids energy waste, but also improves the passenger experience through personalized lighting functions. This intelligent lighting self-dimming control system provides strong support for improving the service quality of high-speed rail.

[0039] Embodiment 2

[0040] Based on the first embodiment, this embodiment describes in detail the working principle of a high-speed rail passenger compartment lighting self-dimming control system in an actual high-speed rail passenger compartment self-dimming, and the specific steps are:

[0041] System startup and initialization: After the high-speed rail passenger compartment lighting self-dimming control system is turned on, each module enters the initialization stage. The passenger flow monitoring module activates the human infrared sensors installed in the business car, aisle and ordinary car passenger compartments to check whether their operating status is normal, and establishes a connection with the high-speed rail passenger compartment Wi-Fi network to ensure that the data transmission channel is unobstructed. The central control module starts the data processor and decision engine, loads the system preset lighting strategy and basic setting information, and the lighting partition module determines the partition rules for the dynamic lighting mode of the business car and the ordinary car, as well as the initial brightness and color temperature setting values ​​of the static lighting mode of the aisle. At the same time, each partition dimming module and control unit are initialized. The memory and storage module completes the initialization of the internal storage architecture and stores various lighting data and passenger personalized settings;

[0042] Passenger flow data collection: During the normal operation of the system, the human infrared sensor of the passenger flow monitoring module continues to work. The sensor uses its sensitive characteristics to infrared rays emitted by the human body to monitor in real time whether there are passengers in each area and the activities of passengers. Once a passenger is detected, the sensor converts the signal into an electrical signal, and amplifies and filters it through the internal circuit to remove the noise caused by external interference and ensure the accuracy of the data. The processed data is transmitted to the central control module in real time in the form of digital signals through the high-speed rail passenger compartment communication network;

[0043] Data analysis and command generation in the central control module: After the central control module receives the passenger flow data, the data processor first performs preliminary processing on the data, checks the integrity and accuracy of the data, and removes possible erroneous data or outliers. Then, the decision engine analyzes the passenger distribution in each area based on the processed data. The decision engine combines these analysis results with the system's preset lighting strategy to determine the adjustment direction and amplitude of the lighting brightness and color temperature in each area and generate corresponding dimming instructions;

[0044] The lighting partition module performs dimming operation (dynamic lighting mode): After the lighting partition module receives the dimming command from the central control module, for the dynamic lighting areas of the business car and ordinary car, the control unit of each partition controls the corresponding dimming module to work according to the command. During the adjustment process, the control unit will monitor the working status of the dimming module in real time to ensure accurate execution of the dimming operation;

[0045] The lighting partition module performs dimming operation (static lighting mode): For the static lighting area of ​​the aisle, after receiving the command from the central control module, the lighting partition module directly adjusts the brightness and color temperature of the aisle lighting fixtures through a dedicated control line. Since the aisle lighting needs to remain stable, the adjustment process is relatively smooth to avoid sudden changes in brightness and color temperature causing discomfort to passengers;

[0046] Personalized lighting setting processing: When passengers have personalized lighting needs, they can operate through the control panel on the seat or a personal mobile device connected to the high-speed rail cabin Wi-Fi. After the passenger sets the brightness and color temperature of the area where they are located, the relevant setting information is transmitted to the central control module, which encrypts the information and then sends it to the memory and storage module. The memory and storage module stores the encrypted personalized setting information in the corresponding location according to the area identification;

[0047] Personalized lighting setting call: When the passenger enters the same area again, the central control module sends a read request to the memory and storage module. The memory and storage module finds the encrypted personalized setting information of the corresponding area and transmits it back to the central control module. The central control module decrypts the information, obtains the original personalized lighting setting data, and then generates a dimming instruction for the area based on this data. It is sent to the control unit of the lighting partition module to control the dimming module to adjust the lighting to the state previously set by the passenger.

[0048] Continuous operation and dynamic adjustment of the system: During the operation of the train, the system continuously repeats the above-mentioned steps of data collection, analysis, dimming operation, etc. As passengers move around in the carriage and get on and off the train, the passenger flow monitoring module continuously updates the data. The central control module dynamically adjusts the lighting strategy according to the new data, and the lighting zoning module executes the dimming instructions in a timely manner, so that the passenger compartment lighting always matches the passenger distribution and personalized needs, providing passengers with a comfortable and energy-saving lighting environment.

[0049] To sum up, through the above implementation process, the high-speed rail passenger compartment lighting self-dimming control system of the present invention realizes the intelligent adjustment of the high-speed rail passenger compartment lighting through the coordinated work of various modules. The passenger flow monitoring module monitors the passenger flow in real time, the central control module analyzes the data and formulates the lighting strategy, the lighting partition module dynamically adjusts the lighting brightness and color temperature according to the passenger distribution, and the memory and storage module ensures that the passenger's personalized settings can be recognized and automatically called out. The system not only improves the passenger comfort, but also optimizes the utilization efficiency of lighting resources.

[0050] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A self-dimming control system for high-speed rail passenger compartment lighting, characterized in that: The components of the system include: passenger flow monitoring module, central control module, lighting partition module, memory and storage module; The passenger flow monitoring module installs human infrared sensors in the business cars, aisles and passenger compartments of the high-speed rail to form a comprehensive passenger flow monitoring network. Through the high-speed rail passenger compartment Wi-Fi network, it monitors the changes in passenger flow in each area in real time and transmits the data to the central control module. The central control module includes a data processor and a decision engine, which are used to receive and analyze the passenger flow data fed back by the human infrared sensor, send instructions to the control unit according to the passenger distribution, realize intelligent adjustment of the lighting brightness, and continuously optimize the lighting strategy according to the passenger flow change trend and the personalized lighting settings of each area. The data processor is responsible for receiving the data from the passenger flow monitoring module and performing preliminary processing on it, including removing noise and correcting deviation. The decision engine analyzes the processed data to determine the lighting adjustment strategy and sends instructions to the control unit. After receiving and analyzing the passenger flow data, the specific process of the decision engine sending instructions to the control unit according to the passenger distribution is as follows: the decision engine calculates the passenger density ρ of each area according to the passenger flow data of each area, and the calculation process is as follows: Wherein, N is the number of passengers in the area, A is the area of ​​the area, and the target lighting brightness B of each area is determined according to the adjustment relationship between the passenger density ρ and the lighting brightness. The adjustment relationship is expressed as B=B0×(a×ρ+b), where B0 is the basic lighting brightness, and a and b are lighting constants used to adjust the sensitivity of the brightness to changes in passenger density. The central control module converts the target lighting brightness B value into a corresponding dimming instruction and sends it to the control unit behind each partition of the lighting partition module to realize intelligent adjustment of the lighting brightness; The lighting partition module sets the business car and the ordinary car to the dynamic lighting mode, and the aisle to the static lighting mode. The dynamic lighting mode performs partition management according to the real-time passenger distribution in the car. Each partition is independent of each other, and each partition is equipped with an independent dimming module and control unit. The static lighting mode is set to the constant light mode, and the central control module directly adjusts the brightness and color temperature through a dedicated control line. The lighting partition module receives the passenger density data of each area transmitted by the central control module in real time through the communication interface, normalizes the passenger density ρ of each area to obtain ρ′, so that its value falls within the interval [0, 1], and performs partition management. The specific process of the partition is as follows: Initialize the number of partitions K max , preset the maximum number of partitions according to the carriage layout and lighting requirements; Sort all regions by ρ′ from high to low; Starting from the highest ranked area, as the starting area of ​​partition 1, the adjacent areas are examined in turn. When the difference between the ρ′ of the adjacent area and the average ρ′ of the current partition is less than the density threshold δ, the adjacent area is included in the current partition, and the average ρ′ of the current partition is updated; Repeat the partitioning process until the current partition cannot be expanded further and the maximum number of partitions K is reached max , calculate the compactness C of each partition K , compactness is measured by the ratio of the area to the perimeter of the partition, where: When C K <γ, then partition K is merged with the adjacent partition K′, and the compactness of the merged new partition satisfies: C KK′ >C K And C KK′ >C K′ , where γ represents the compactness threshold of the partition, and compactness is an indicator to measure the regularity of the regional shape; The memory and storage module is used to store the instructions of the central control module and the lighting parameters of the dimming module and the control unit, and has a memory function. The passenger sets the brightness and color temperature within the partition through the communication interface. When the passenger enters the same area again, the corresponding personalized lighting settings are automatically called out.

2. A high-speed railway passenger compartment lighting self-dimming control system according to claim 1, characterized in that: The dimming module adopts LED driving technology and can finely adjust the light brightness and color temperature. The control unit is responsible for receiving instructions from the central control system and controlling the working state of the dimming module.

3. A high-speed railway passenger compartment lighting self-dimming control system according to claim 2, characterized in that: The LED driving technology in the dimming module adopts a constant current driving method. The working principle of the constant current driving circuit is to stabilize the output current by controlling the on and off time of the power switch tube. The working process is: the input voltage V in After rectification and filtering, it enters the pulse width modulation PWM control chip. The PWM control chip adjusts the duty cycle D of the output pulse according to the dimming signal value transmitted by the central control module and sets the on time of the power switch tube to t on , the off time is t off , switching period T = t on +t off , then the duty cycle D = t on / T, by changing the duty cycle D, adjusting the on and off state of the power switch tube, and then controlling the energy storage and release process of the inductor L, so that the output current I o Keep constant, during this process, the output current I o With input voltage V in , inductance L and duty cycle D always maintain: Where f is the switching frequency. This constant current driving method ensures that the LED lamp can work stably under different input voltages and dimming conditions.

4. The self-dimming control system for high-speed rail passenger compartment lighting according to claim 1 is characterized in that: The data interaction process between the central control module and the memory and storage module is as follows: when a passenger makes personalized lighting settings, the central control module encrypts the setting information and sends the encrypted information to the memory and storage module. After receiving the information, the memory and storage module stores the information in corresponding locations according to different partitions. When reading the passenger's preference settings, the memory and storage module reads the encrypted information from the corresponding location according to the request sent by the central control module and sends it back to the central control module. The central control module decrypts the received information to obtain the original personalized lighting setting information for controlling the lighting system.

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