Light rail taillight lighting system

Abstract

The invention discloses a light rail taillight lighting system, which relates to the technical field of rail transit lighting. The system comprises the following components: a data acquisition module, an intelligent control module, a drive adjustment module and a lighting display module; the data acquisition module is composed of an ambient light sensor, an acceleration sensor, an operation data interface and a positioning sensor; the ambient light sensor regularly monitors the light intensity, converts it into an electrical signal for processing and transmission; the acceleration sensor detects acceleration according to frequency and converts it into an electrical signal for output; the invention monitors the external light intensity in real time, and automatically adjusts the brightness and flashing frequency of the taillight according to the real-time operation state and the position of the light rail; this intelligent lighting control method not only ensures that the taillight always maintains good visibility in a complex and changeable operation environment, effectively warns surrounding vehicles and pedestrians, but also greatly improves the driving safety of the light rail.

Description

Technical Field

[0001] The invention relates to the technical field of rail transit lighting, in particular to a light rail taillight lighting system. Background Art

[0002] In the rapidly developing field of urban rail transit, light rail, as an efficient and environmentally friendly public transportation tool, has attracted much attention for its safety and operating efficiency. As an important part of light rail vehicles, the light rail taillight lighting system not only undertakes the important task of transmitting safety warning information to vehicles and pedestrians behind, but is also directly related to the overall operating efficiency of the light rail and the sense of security of passengers. With the development of intelligent transportation systems, the light rail taillight lighting system is gradually changing from the traditional fixed brightness mode to the intelligent and adaptive direction to adapt to the complex and changeable operating environment. This change not only requires the taillight system to accurately reflect the operating status of the light rail, but also needs to be able to automatically adjust according to external light conditions to achieve the goals of energy saving and environmental protection.

[0003] Traditional light rail taillight lighting systems mostly use fixed brightness settings or simple manual adjustment methods. This design has many shortcomings in practical applications. On the one hand, fixed brightness taillights cannot be automatically adjusted according to the intensity of external light, resulting in excessive lighting during bright daytime, causing energy waste. On the other hand, in dim nights or tunnels, the warning effect may be affected due to insufficient brightness. On the other hand, the manual adjustment method is not only cumbersome to operate, but also unable to reflect the operating status of the light rail in real time, such as acceleration, deceleration, braking, etc., thereby limiting the flexibility of the taillight in providing safety warning information. In addition, the traditional taillight system lacks deep integration with the light rail operation system and cannot make full use of the light rail operation data to realize intelligent lighting control.

[0004] In view of the above problems, it is necessary to optimize the existing light rail taillight lighting system and realize precise control of the taillight lighting by integrating ambient light information, light rail operation status data and positioning data. Therefore, it is of great significance to develop a light rail taillight lighting system that can comprehensively realize the above characteristics. Summary of the invention

[0005] The purpose of the present invention is to make up for the shortcomings of the prior art and provide a light rail taillight lighting system, which can monitor the external light intensity in real time through the ambient light sensor, the acceleration sensor and the operation data interface accurately reflect the operation status of the light rail, the positioning sensor provides accurate geographical location information, and the intelligent control module generates personalized taillight brightness, flashing frequency and flashing rhythm control instructions based on the data, using algorithms and preset control strategies. The drive adjustment module accurately adjusts the current or voltage output to the taillight according to these instructions, thereby realizing intelligent and adaptive lighting control, which not only improves the lighting effect and energy-saving performance of the light rail taillight, but also significantly enhances the safety and efficiency of the light rail operation.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a light rail taillight lighting system, the system includes the following components: a data acquisition module, an intelligent control module, a drive adjustment module and a lighting display module;

[0007] The data acquisition module is composed of an ambient light sensor, an acceleration sensor, an operation data interface and a positioning sensor. The ambient light sensor regularly monitors the light intensity and converts it into an electrical signal for processing and transmission. The acceleration sensor detects acceleration according to the frequency and converts it into an electrical signal for output. The operation data interface establishes communication with the light rail system to regularly obtain operation data. The positioning sensor initializes to obtain position information, calculates the distance and azimuth, and then transmits it.

[0008] The intelligent control module receives the electrical signal from the data acquisition module, analyzes and processes the various signals received through the built-in data processing algorithm and the preset control strategy, generates a corresponding taillight brightness adjustment instruction after comparing the ambient light sensor signal with the preset light intensity threshold, and judges the light rail operation status in combination with the acceleration sensor signal and the operation data transmitted from the operation data interface, adjusts the taillight brightness and flashing frequency, and generates an instruction to flash the taillight at a specific rhythm based on the position information transmitted by the positioning sensor and the preset rules;

[0009] The drive adjustment module receives the control instruction sent by the intelligent control module, and controls the brightness, flashing frequency and flashing rhythm of the taillight by adjusting the current output to the taillight;

[0010] The lighting display module adjusts its own brightness, flickering frequency and flickering rhythm in real time according to the control signal transmitted from the driving and adjusting module.

[0011] Furthermore, the data acquisition module is composed of an ambient light sensor, an acceleration sensor, an operation data interface and a positioning sensor. The ambient light sensor is installed on the outside of the light rail to monitor the external light intensity in real time and convert it into an electrical signal output. The acceleration sensor is set at a specific position on the light rail body to detect the acceleration change of the light rail, thereby judging the operation status of the light rail and converting the operation status information into an electrical signal. The operation data interface is connected to the light rail operation system to obtain the speed and braking operation data of the light rail. The positioning sensor is responsible for obtaining the real-time position information of the light rail and obtaining the distance and orientation information of the light rail relative to the platform or a specific area.

[0012] Furthermore, the intelligent control module receives the electrical signal of the data acquisition module, analyzes and processes the various received signals through the built-in data processing algorithm and the preset control strategy, specifically, compares the light intensity value with the preset first light intensity threshold and the second light intensity threshold, dynamically adjusts the taillight brightness through the brightness adjustment formula, generates a control instruction to reduce the taillight brightness when the light intensity is higher than the first light intensity threshold, generates a control instruction to increase the taillight brightness when the light intensity is lower than the second light intensity threshold, maintains the current taillight brightness when the light intensity is between the two thresholds, receives the signal and data from the acceleration sensor and the operation data interface, and analyzes and determines whether the light rail is in an accelerating, uniform, decelerating or stopping state at the same time, and adjusts the light rail according to the adjustment algorithm. The method dynamically adjusts the light brightness and flashing frequency. When it is determined that the light rail is in an accelerating or uniform speed state, a control instruction is generated to maintain the basic warning brightness of the tail light. When it is determined that the light rail is in a decelerating state, a control instruction is dynamically generated to increase the brightness of the tail light and speed up the flashing frequency. The greater the deceleration amplitude, the greater the degree of increase in the brightness of the tail light or the amplitude of the increase in the flashing frequency. When it is determined that the light rail is in a parking state, a control instruction is generated to maintain the high brightness of the tail light or a specific flashing mode. In addition, the positioning data from the positioning sensor is received, and the distance between the light rail and the platform or a specific area is calculated. When the distance to the platform or the specific area reaches a preset distance, a control instruction is generated to make the tail light flash at a specific rhythm. By integrating the control instructions generated according to different data, the final brightness control instruction is determined according to priority and logical relationships. and flashing frequency command .

[0013] Furthermore, the intelligent control module compares the light intensity value with a preset first light intensity threshold and a second light intensity threshold. For the first light intensity threshold, the average light intensity values ​​of different seasons and different time periods are collected. , Indicates the season, Indicates the time period and calculates the comprehensive average light intensity ,in is the proportion of each period in a day, then the first light intensity threshold , where the environmental complexity coefficient The visual fatigue correction factor is determined through optical characteristics analysis and field testing in different environments. Based on the research on human visual fatigue and actual tests, the safety margin coefficient is determined by observing the visual fatigue degree of the taillights under different light intensities. According to the light rail operation safety risk assessment, is the average seasonal illumination coefficient, is the illumination coefficient of the four seasons The average value is calculated as: For the second light intensity threshold, collect the minimum light intensity values ​​in different seasons and time periods. , calculate the comprehensive minimum light intensity: , then the calculation formula for the second light intensity threshold is: .

[0014] Furthermore, the intelligent control module dynamically adjusts the brightness of the taillights through a brightness adjustment formula, which is: ,in, is the target brightness of the taillight adjusted according to the ambient light. Is the basic brightness of the taillight, is the ambient light adjustment coefficient, which is used to control the influence of ambient light on the brightness of the taillight. It is the preset standard light intensity threshold. When the light intensity is higher than the standard light intensity threshold, the brightness needs to be reduced. It corresponds to the first light intensity threshold. When the light intensity is lower than the standard light intensity threshold and the brightness needs to be increased, it corresponds to the second light intensity threshold , It is the external light intensity collected by the ambient light sensor in real time.

[0015] Furthermore, the intelligent control module analyzes and determines whether the light rail is in the state of acceleration, constant speed, deceleration or parking, and dynamically adjusts the tail light brightness and flashing frequency according to the adjustment algorithm. Make adjustments, including is the target brightness of the taillight adjusted according to the operating status. is the acceleration adjustment coefficient, which is used to control the influence of acceleration on the brightness of the taillights. It is the light rail acceleration collected by the acceleration sensor in real time. Acceleration is positive and deceleration is negative. It is the speed change adjustment coefficient, which is used to control the influence of speed change on the brightness of the taillight. is the speed change of the light rail in a short period of time. For the flashing frequency, the formula Make adjustments, including It is the flashing frequency of the taillight adjusted according to the running status. is the basic flashing frequency of the taillights, It is the flicker frequency adjustment coefficient, which is used to control the influence of acceleration on the flicker frequency.

[0016] Furthermore, the intelligent control module receives the positioning data transmitted by the positioning sensor, calculates the distance between the light rail and the platform or a specific area, and generates a control instruction to make the taillight flash at a specific rhythm when the distance from the platform or the specific area reaches a preset distance. The control instruction generation formula is: ,in, It is the taillight flashing cycle adjusted according to the positioning information. is the basic flashing cycle of the taillights, is the distance adjustment coefficient, which is used to control the influence of distance on the flashing period. is the preset critical distance, It is the distance between the light rail and the platform or specific area collected in real time by the positioning sensor.

[0017] Furthermore, the intelligent control module determines the final control instruction according to the priority and logical relationship, and the priority relationship is: control instruction based on the operating state>positioning data control instruction>light intensity control instruction.

[0018] Furthermore, the driving adjustment module controls the brightness, flashing frequency and flashing rhythm of the taillight by adjusting the current output to the taillight, and the control of the current on the brightness of the taillight is: ,in, is the target current output to the taillight, is the final taillight target brightness calculated by the intelligent control module. is the brightness-current conversion coefficient, and the current controls the flicker frequency as follows: ,in, is the current conduction time, is the current off time, The taillight flashing frequency is calculated by the intelligent control module and adjusted according to the operating status. and A combination of .

[0019] Compared with the prior art, this light rail taillight lighting system has the following beneficial effects:

[0020] 1. The present invention monitors the external light intensity in real time and automatically adjusts the brightness and flashing frequency of the taillights according to the real-time operating status and location of the light rail. This intelligent lighting control method not only ensures that the taillights always maintain good visibility in a complex and changeable operating environment, effectively warns surrounding vehicles and pedestrians, but also greatly improves the driving safety of the light rail.

[0021] 2. The present invention uses an intelligent control module to accurately control the taillight lighting, thereby realizing energy-saving measures such as reducing the brightness of the taillight when there is sufficient light and increasing the flashing frequency when the light rail brakes or decelerates. These measures not only significantly reduce the energy consumption of the light rail, but also extend the service life of the taillight, thereby effectively reducing the operating cost of the light rail. At the same time, the system's high-precision current regulation capability also ensures that the taillight always maintains a stable lighting effect while saving energy.

[0022] 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

[0023] 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.

[0024] Figure 1 It is a structural schematic diagram of a light rail taillight lighting system;

[0025] Figure 2 The figure is a flow chart of a light rail taillight lighting system. DETAILED DESCRIPTION

[0026] 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.

[0027] Embodiment 1

[0028] An ambient light sensor is installed on the top of the light rail vehicle. After the system is started, it is quickly initialized and begins to monitor the external light intensity at a frequency of every 100 milliseconds. The central area of ​​a large city is densely populated with high-rise buildings and many glass curtain walls. The light reflection and scattering are complex, and the environment is relatively complex. In summer, the sun is strong and the overall lighting conditions are good, but the human eye is prone to visual fatigue under strong light. After a large number of field tests and analyses in the early stage, it is determined that the environmental complexity coefficient in this area in summer is at a high level, and the visual fatigue correction coefficient is relatively low. At the same time, combined with the statistical data of the light data in this area for many years, the approximate range of light intensity is clarified. The acceleration sensor is installed near the center of gravity of the light rail vehicle to ensure the accuracy of the measurement. After the system is started, the acceleration sensor performs self-test and initialization. Then, at a sampling frequency of 50 times per second, the acceleration changes in the light rail operation process are detected in real time and converted into electrical signals. After amplification, filtering and other processing, noise interference is removed and then transmitted to the intelligent control module. The operation data interface uses the CAN bus protocol to establish a stable communication connection with the light rail operation system. Every 200 milliseconds, the operation data interface obtains speed, braking and other operation data from the light rail operation system. At the same time, to ensure the accuracy and integrity of the data, the data is verified. The positioning sensor is installed at a suitable position on the light rail. After the system is started, the positioning sensor begins to initialize, and searches for satellite signals through high-precision satellite positioning technology to obtain the real-time geographic location information of the light rail, and then transmits the processed positioning data to the intelligent control module.

[0029] The intelligent control module receives the electrical signal from the ambient light sensor and accurately converts it into a light intensity value through a built-in analog-to-digital conversion circuit. Based on a large number of field tests and data analysis in the central area of ​​the large city in the early stage, as well as the visual characteristics of the human eye and energy-saving needs, the first light intensity threshold and the second light intensity threshold suitable for the area are determined. When the light intensity is higher than the first light intensity threshold, it indicates that there is sufficient light outside. At this time, the intelligent control module generates a control instruction to reduce the brightness of the taillights to achieve energy saving. When the light intensity is lower than the second light intensity threshold, it indicates that the light is dim. In order to ensure the warning effect of the light rail taillights in low-light environments, the intelligent control module generates a control instruction to increase the brightness of the taillights. If the light intensity is between the two thresholds, It indicates that the current lighting conditions are moderate. The intelligent control module generates a control instruction to maintain the current taillight brightness and maintain the existing lighting status. The intelligent control module receives signals and data from the acceleration sensor and the operation data interface, and conducts a comprehensive analysis of these data to accurately determine the operation status of the light rail. In the central area of ​​a large city, the operation status of the light rail changes frequently, and the start and stop are relatively frequent. When it is determined that the light rail is in an acceleration or uniform speed state, in order to ensure the basic safety warning function, the intelligent control module generates a control instruction to maintain the basic warning brightness of the taillight. When the light rail is in a deceleration state, the intelligent control module combines the acceleration and speed data to accurately calculate the deceleration amplitude, and dynamically generates a control instruction to increase the brightness of the taillight and speed up the flashing frequency according to the deceleration amplitude. The greater the deceleration, the greater the degree of increase in the brightness of the taillights, and the greater the increase in the flashing frequency. When the light rail is in a stopped state, in order to ensure safety in a stationary state, the intelligent control module generates a control instruction to keep the taillights at high brightness. This high-brightness setting can make the light rail taillights a striking symbol in various complex environments, reminding the surrounding traffic participants to pay attention. When the data from the positioning sensor shows that the light rail is 50 meters away from the platform, the intelligent control module quickly generates a control instruction to make the taillights flash at a specific rhythm. This specific rhythm is pre-set based on the actual situation of the area, such as the density of pedestrians around the platform, the speed of vehicles, and the reaction time of passengers. After repeated testing and optimization, it is set and stored in the intelligent control module. For example, it is set to flash three times per second. This flashing rhythm can effectively attract the attention of passengers and platform staff without causing visual fatigue due to excessive frequency. When integrating the control instructions generated by different data, they are strictly sorted according to the priority of control instructions based on operating status > positioning data control instructions > light intensity control instructions. For example, if the light rail is in a parking state and the ambient light data also triggers the brightness adjustment instruction, the intelligent control module will give priority to executing the parking state instruction to ensure that the most significant safety warning can be provided in a timely manner in the relatively dangerous state of parking. This is because in the parking state, the relative position relationship between the light rail and the surrounding traffic participants is more complex, and a stronger warning signal is needed to ensure safety.Through this priority sorting, the intelligent control module can make decisions quickly and accurately in a complex and changeable operating environment, ensuring that the light rail taillights always operate in the most appropriate state and achieve the best balance between safety and energy saving. The final control instructions are efficiently sent to the drive adjustment module to provide clear guidance for subsequent taillight control.

[0030] The drive adjustment module receives the control instructions from the intelligent control module, and conducts in-depth analysis of the instructions through a specially designed instruction parsing program to accurately identify the specific requirements of the instructions regarding parameters such as taillight brightness and flashing frequency. If the instruction requires increasing the brightness of the taillight, the drive adjustment module uses advanced PWM technology to increase the current output to the taillight by adjusting the duty cycle of the pulse signal, thereby increasing the brightness of the taillight. If the instruction requires reducing the brightness, the duty cycle of the PWM signal is reduced and the output current is correspondingly reduced to reduce the brightness of the taillight. For the flashing frequency requirement, the drive adjustment module achieves it by accurately controlling the frequency of the PWM signal. For example, if the instruction requires accelerating the flashing frequency, the frequency of the PWM signal is increased to speed up the on-off speed of the current, thereby increasing the flashing frequency of the taillight. During the entire adjustment process, the drive adjustment module continuously optimizes and adjusts the parameters of the PWM signal based on the feedback information from the intelligent control module.

[0031] The lighting display module receives the current driving signal from the driving and regulating module. The signal carries the information about the brightness and flashing frequency of the taillights. The high-brightness LED lamp in the lighting display module accurately changes the luminous intensity according to the current size to achieve brightness adjustment. When the current output by the driving and regulating module increases, the recombination of electrons and holes inside the LED lamp intensifies, thereby emitting brighter light and achieving increased brightness. When the current decreases, the recombination process weakens and the brightness decreases accordingly.

[0032] The lighting display module adjusts the flashing frequency by controlling the on-off time and mode of the current. For example, the on-off of the current is controlled at a rhythm of 3 flashes per second. When the current is on, the LED light turns on, and when the current is off, the LED light turns off. By precisely controlling the time interval of the on-off of the current, the taillights flash at a specific rhythm, perfectly achieving the display effect required by the instructions of the intelligent control module, providing clear and effective warning signs for the safe operation of light rail in the central areas of large cities.

[0033] Embodiment 2

[0034] An ambient light sensor is installed at a specific location on the side of the light rail. After the system is started, the ambient light sensor begins to initialize and comprehensively checks the hardware status to ensure that it can accurately perceive the external light. After the initialization is completed, the external light intensity is continuously monitored at intervals of every 100 milliseconds. Suburban areas are relatively open, with fewer buildings, and light reflection and scattering are relatively simple, and the environmental complexity is relatively low. In autumn, the solar altitude angle gradually decreases, and the light intensity is weakened compared to summer, but the overall lighting conditions are still relatively stable. In order to determine the relevant parameters, a large number of field tests and data analysis were carried out in the early stage. According to the environmental complexity coefficient The definition of the suburban environment is to determine the area's autumn The value is relatively low. At the same time, the light data of different periods in autumn in this area for many years were collected to calculate the comprehensive average light intensity. and the combined minimum light intensity , combined with human eye visual fatigue research and actual testing, determine the visual fatigue correction coefficient Taking into account the seasonal light differences, the seasonal light coefficient of autumn is obtained through statistical analysis. , and then calculate the average seasonal light coefficient In addition, based on the light rail operation safety risk assessment, the safety margin coefficient is determined .

[0035] The acceleration sensor is installed near the center of gravity of the vehicle body. After the system is started, it performs self-test and initialization, calibrates the zero point and range to ensure accurate measurement. After that, it detects the acceleration change of the light rail in real time at a sampling frequency of 50 times per second, and converts the physical quantity of acceleration into an electrical signal, amplifies and filters the electrical signal, eliminates noise and interference, and sends the processed acceleration signal to the intelligent control module. The operation data interface uses the CAN bus protocol to establish a stable communication connection with the light rail operation system, obtains speed, braking and other operation data from the light rail operation system every 200 milliseconds, converts and verifies the obtained operation data to ensure that the data is accurate and complete, and then transmits the processed operation data to the intelligent control module. The positioning sensor is installed at a suitable position on the light rail, started and initialized, searches for satellite signals through satellite positioning technology or connects to the ground positioning base station to obtain the geographical location information of the light rail, including longitude and latitude, altitude, etc., parses and processes the positioning data, calculates the distance between the light rail and the platform or a specific area, and sends the processed positioning data to the intelligent control module.

[0036] The intelligent control module receives the electrical signal from the ambient light sensor and converts it into light intensity value. , calculate the first light intensity threshold according to the formula and the second light intensity threshold , when the light intensity Higher than When the taillight brightness is reduced, a control instruction is generated, and the brightness after reduction is adjusted by the ambient light adaptive brightness adjustment formula Calculated, among which Is the basic brightness of the taillight, is the ambient light adjustment factor. Lower than When the control command to increase the brightness of the taillight is generated, the brightness after the increase is also calculated according to the above formula. For comparison, if the light intensity In and The current taillight brightness is maintained, and the running status of the light rail is judged by receiving signals and data from the acceleration sensor and the running data interface. When the light rail is in the state of acceleration or constant speed, the basic warning brightness of the taillight is generated. When the light rail is in a deceleration state, combined with the acceleration Calculate the deceleration amplitude based on the speed data and adjust the brightness according to the operating status And the flash frequency adjustment formula , dynamically generate and increase the brightness of the taillights to and increase the flashing frequency to The control instructions are is the acceleration adjustment coefficient, is the speed change adjustment coefficient, is the speed change of the light rail in a short period of time. is the basic flashing frequency of the taillights, It is the flashing frequency adjustment coefficient. The greater the deceleration, the greater the degree of taillight brightness increase or the faster the flashing frequency. When the light rail is in a stopped state, a control instruction is generated to keep the taillight high brightness or a specific flashing mode. In addition, the positioning data from the positioning sensor is received to calculate the distance between the light rail and the platform or a specific area. , when the distance When the preset distance (such as 50 meters) is reached, according to the formula , generate a signal that makes the taillights move at a specific rhythm (corresponding to ) flashing control instructions, where is the basic flashing cycle of the taillights, is the distance adjustment factor, It is the preset critical distance. The intelligent control module integrates the control instructions generated by different data according to the priority of control instructions based on operating status > positioning data control instructions > light intensity control instructions. For example, if the light rail is in a deceleration state and receives a brightness adjustment instruction triggered by ambient light at the same time, the deceleration state instruction is executed first, and finally the integrated control instruction is sent to the drive adjustment module.

[0037] The drive adjustment module receives the control command from the intelligent control module, analyzes the command, and identifies the taillight brightness in the command (such as , ), flashing frequency (such as ), flashing rhythm (such as ) and other parameters, according to the analyzed control instructions, according to the current and brightness conversion formula Adjust the current or voltage output to the taillight, where is the final taillight target brightness calculated by the intelligent control module. is the brightness-current conversion factor. If the instruction requires to increase the brightness of the taillight (increase ), then increase the output current If you want to reduce the brightness of the taillights (reduce ), then reduce the output current The requirements for flicker frequency and flicker rhythm are achieved by controlling the on-off time and mode of current or voltage. For flicker frequency, according to the formula Calculate the conduction time of current or voltage and turn-off time , so as to realize the control of the flashing frequency of the taillights. For the flashing rhythm, by controlling and A combination of , monitor the current output to the taillight in real time, feed the monitoring data back to the intelligent control module, and optimize the current adjustment according to the feedback information of the intelligent control module to ensure that the actual brightness, flashing frequency and flashing rhythm of the taillight meet the requirements of the control instructions.

[0038] The lighting display module receives the current or voltage driving signal from the driving adjustment module, and adjusts the brightness, flashing frequency and flashing rhythm of the taillight according to the parameters of the driving signal. By controlling the on-off time and mode of the current, the flashing frequency and flashing rhythm are adjusted. and To control the on and off of the current, so that the taillights display according to the brightness, flashing frequency and rhythm required by the intelligent control module.

[0039] 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 light rail taillight lighting system, characterized in that: The system includes the following components: data acquisition module, intelligent control module, drive adjustment module and lighting display module; The data acquisition module is composed of an ambient light sensor, an acceleration sensor, an operation data interface and a positioning sensor. The ambient light sensor regularly monitors the light intensity and converts it into an electrical signal for processing and transmission. The acceleration sensor detects acceleration according to the frequency and converts it into an electrical signal for output. The operation data interface establishes communication with the light rail system to regularly obtain operation data. The positioning sensor initializes to obtain position information, calculates the distance and azimuth, and then transmits it. The intelligent control module receives the electrical signal of the data acquisition module, analyzes and processes the various received signals through the built-in data processing algorithm and the preset control strategy, specifically, compares the light intensity value with the preset first light intensity threshold and the second light intensity threshold, dynamically adjusts the taillight brightness through the brightness adjustment formula, generates a control instruction to reduce the taillight brightness when the light intensity is higher than the first light intensity threshold, generates a control instruction to increase the taillight brightness when the light intensity is lower than the second light intensity threshold, maintains the current taillight brightness when the light intensity is between the two thresholds, receives the signal and data from the acceleration sensor and the operation data interface, and analyzes and determines at the same time whether the light rail is in the operation state of acceleration, constant speed, deceleration or parking, and dynamically adjusts the taillight brightness according to the adjustment algorithm. The light brightness and flashing frequency are adjusted to the light brightness and flashing frequency. When it is determined that the light rail is in an accelerating or uniform speed state, a control instruction is generated to maintain the basic warning brightness of the tail light. When it is determined that the light rail is in a decelerating state, a control instruction is dynamically generated to increase the brightness of the tail light and speed up the flashing frequency. The greater the deceleration amplitude, the greater the degree of increase in the brightness of the tail light or the amplitude of the increase in the flashing frequency. When it is determined that the light rail is in a parking state, a control instruction is generated to maintain the high brightness of the tail light or a specific flashing mode. In addition, the positioning data transmitted by the positioning sensor is received, and the distance between the light rail and the platform or a specific area is calculated. When the distance to the platform or a specific area reaches a preset distance, a control instruction is generated to make the tail light flash at a specific rhythm. By integrating the control instructions generated according to different data, the final brightness control instruction L is determined according to the priority and logical relationship. final and flashing frequency command f run ; The drive adjustment module receives the control instruction sent by the intelligent control module, and controls the brightness, flashing frequency and flashing rhythm of the taillight by adjusting the current output to the taillight; The lighting display module adjusts its own brightness, flickering frequency and flickering rhythm in real time according to the control signal transmitted from the driving and adjusting module.

2. A light rail taillight lighting system according to claim 1, characterized in that: The data acquisition module is composed of an ambient light sensor, an acceleration sensor, an operation data interface and a positioning sensor. The ambient light sensor is installed on the outside of the light rail to monitor the external light intensity in real time and convert it into an electrical signal output. The acceleration sensor is set at a specific position on the light rail body to detect the acceleration change of the light rail, thereby judging the operation status of the light rail and converting the operation status information into an electrical signal. The operation data interface is connected to the light rail operation system to obtain the speed and braking operation data of the light rail. The positioning sensor is responsible for obtaining the real-time position information of the light rail and obtaining the distance and direction information of the light rail relative to the platform or a specific area.

3. The light rail taillight lighting system according to claim 1, characterized in that: The intelligent control module compares the light intensity value with the preset first light intensity threshold and the second light intensity threshold. For the first light intensity threshold, the average light intensity values ​​I of different seasons and different time periods are collected. j，k , j represents season, k represents time period, calculate the comprehensive average light intensity where t k is the proportion of each period in a day, then the first light intensity threshold The environmental complexity coefficient C is determined by analyzing the optical characteristics of different environments and field tests. The visual fatigue correction coefficient V is determined based on the visual fatigue degree of the taillights observed under different light intensities according to the research on human visual fatigue and actual tests. The safety margin coefficient M is determined based on the safety risk assessment of light rail operation. avg is the average seasonal illumination coefficient, is the illumination coefficient of the four seasons S j The average value is calculated as: For the second light intensity threshold, collect the minimum light intensity values ​​I in different seasons and time periods. j，k，min , calculate the comprehensive minimum light intensity: The calculation formula for the second light intensity threshold is: I2 = C × S avg ×V×M×I com-min .

4. The light rail taillight lighting system according to claim 1, characterized in that: The intelligent control module dynamically adjusts the brightness of the taillights through a brightness adjustment formula, which is: Among them, L env is the target brightness of the taillight adjusted according to the ambient light, L base is the base brightness of the taillight, k env It is the ambient light adjustment coefficient, which is used to control the influence of ambient light on the brightness of the taillights. I0 is the preset standard light intensity threshold. When the light intensity is higher than the standard light intensity threshold, the brightness needs to be reduced, which corresponds to the first light intensity threshold I1. When the light intensity is lower than the standard light intensity threshold, the brightness needs to be increased, which corresponds to the second light intensity threshold I2. I is the external light intensity collected by the ambient light sensor in real time.

5. The light rail taillight lighting system according to claim 1, characterized in that: The intelligent control module analyzes and determines whether the light rail is in the state of acceleration, constant speed, deceleration or parking, and dynamically adjusts the tail light brightness and flashing frequency according to the adjustment algorithm. The tail light brightness is adjusted by the formula L run =L base ×(1+k a ×|a|+k v ×Δv) is adjusted, where L run is the target brightness of the taillight adjusted according to the operating status, k a is the acceleration adjustment coefficient, which is used to control the influence of acceleration on the brightness of the taillights. a is the light rail acceleration collected by the acceleration sensor in real time. Acceleration is positive and deceleration is negative. k v is the speed change adjustment coefficient, which is used to control the influence of speed change on the brightness of the taillight. Δv is the speed change of the light rail in a short period of time. For the flashing frequency, the formula f run =f base ×(1+k f ×|a|) is adjusted, where f run is the taillight flashing frequency adjusted according to the operating status, f base is the basic flashing frequency of the taillight, k f It is the flicker frequency adjustment coefficient, which is used to control the influence of acceleration on the flicker frequency.

6. The light rail taillight lighting system according to claim 1, characterized in that: The intelligent control module receives the positioning data from the positioning sensor, calculates the distance between the light rail and the platform or a specific area, and generates a control instruction to make the taillight flash at a specific rhythm when the distance from the platform or the specific area reaches a preset distance. The control instruction generation formula is: Among them, T pos is the taillight flashing cycle adjusted according to the positioning information, T base is the basic flashing cycle of the tail light, k d is the distance adjustment coefficient, which is used to control the influence of distance on the flashing period. d0 is the preset critical distance, and d is the distance between the light rail and the platform or specific area collected in real time by the positioning sensor.

7. The light rail taillight lighting system according to claim 1, characterized in that: The intelligent control module determines the final control instruction according to the priority and logical relationship, and the priority relationship is: control instruction based on the running state> positioning data control instruction> light intensity control instruction.

8. The light rail taillight lighting system according to claim 1, characterized in that: The driving adjustment module controls the brightness, flashing frequency and flashing rhythm of the taillight by adjusting the current output to the taillight. The control of the brightness of the taillight by the current is: Among them, I out is the target current output to the taillight, L final is the final taillight target brightness calculated by the intelligent control module, k L is the brightness-current conversion coefficient, and the current controls the flicker frequency as follows: Among them, t on is the current conduction time, t off is the current off time, f run The taillight flashing frequency is calculated by the intelligent control module and adjusted according to the operating status. For the flashing rhythm, the control t on and t off A combination of pos .

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