Application method and system of active luminous sign based on road environment and traffic flow

Abstract

The invention discloses an application method and system of an active light-emitting sign based on a road environment and traffic flow, and the method comprises the steps: collecting road environment data and traffic flow data in real time through employing a vehicle-mounted sensor and a roadside monitoring device, and the road environment data comprises the temperature and real-time illumination of an area where a road is located; transmitting the road environment data and the traffic flow data to a traffic control center; the traffic control center calculates the brightness, the color and the flicker frequency required by the LED lamp bead of the active light-emitting sign device in real time; transmitting the calculated brightness, color and flicker frequency to the active luminous sign equipment through wireless communication; the microcontroller of the active light-emitting sign device adjusts the LED lamp beads in real time according to the received brightness, color and flicker frequency. The method and the system can intelligently adapt to different weather, time and road conditions, are energy-saving and environment-friendly, are high in safety, are beneficial to traffic management optimization, and are high in expandability.

Description

Technical Field

[0001] The present invention belongs to the field of road traffic safety, and in particular relates to an application method and system of an active luminous sign based on road environment and traffic flow. Background Art

[0002] Active luminous traffic signs use LED light sources and retro-reflective materials to make their layout. The light source of the sign itself can meet the requirements for sign information recognition in all-weather conditions. It is a new type of traffic safety equipment that can increase the visible distance of the sign at night or in low visibility conditions, thereby reducing the occurrence of traffic accidents.

[0003] According to the sign specifications and setting principles, and taking into account the actual road traffic conditions, active luminous traffic signs are reasonably arranged to form a complete and continuous road network guidance system, which provides drivers with a clear driving environment and can effectively improve the road driving safety level.

[0004] However, currently active luminous traffic signs have not been managed intelligently and have not yet fulfilled their intended functions. Summary of the invention

[0005] In view of the defects existing in the above-mentioned prior art, the present invention provides an application method of an active luminous sign based on road environment and traffic flow, comprising the following steps:

[0006] Step S101: using vehicle-mounted sensors and roadside monitoring equipment to collect road environment data and traffic flow data in real time, wherein the road environment data includes the temperature and real-time illumination of the road area;

[0007] Step S103, transmitting the road environment data and traffic flow data to a traffic control center;

[0008] Step S105: The traffic control center calculates the required brightness, color and flashing frequency of the LED lamp beads of the active light-emitting sign device in real time based on the road environment data and traffic flow data;

[0009] Step S107, transmitting the calculated brightness, color and flashing frequency to the active light-emitting sign device via wireless communication;

[0010] Step S109: The microcontroller of the active light-emitting sign device adjusts the LED lamp beads in real time according to the received brightness, color and flashing frequency.

[0011] Wherein, the step S105 includes: the traffic control center inputs the processed road environment data and traffic flow data into the optimal parameter model of the active luminous sign to calculate the required brightness, color and flashing frequency of the LED lamp beads of the active luminous sign.

[0012] The optimal parameter model of the active luminous sign is obtained by training based on historical data of the road environment data and traffic flow data.

[0013] Wherein, assuming that the ambient temperature is T, the ambient light intensity is L, the traffic flow is Q, the flashing frequency of the active light-emitting sign light is f, the brightness of the active light-emitting sign is l, and the color of the active light-emitting sign is c, the optimal parameter model of the active light-emitting sign adopts the following formula:

[0014] Among them, a1,…,a9,b1,b2,b3 are regression coefficients.

[0015] Among them, the least squares method is used to fit the historical data to obtain a1,…,a9,b1,b2,b3.

[0016] Among them, suppose there are n sets of historical data (T i , L i , Q i , f i , l i , c i ), i = 1, 2, ..., n, find a1, ..., a9, b1, b2, b3 to minimize the following loss function:

[0017]

[0018] In order to minimize J, partial derivatives of a1, ..., a9, b1, b2, b3 are taken and set equal to 0, and a system of linear equations containing these unknown parameters is obtained. Matrix inversion is used to solve the values ​​of a1, ..., a9, b1, b2, b3.

[0019] Among them, step S109 includes that after the active luminous sign device receives the parameter data, it immediately updates the brightness, color and flashing frequency settings of its own LED lamp beads, and feeds back the current working status to the traffic control center.

[0020] The traffic control center regularly fine-tunes and retrains the optimal parameter model of the active luminous sign.

[0021] The present invention also proposes an application system of active luminous signs based on road environment and traffic flow, including a data acquisition device for real-time acquisition of road environment data and traffic flow data, wherein the road environment data includes the temperature and real-time illumination of the area where the road is located;

[0022] A traffic control center, which is used to calculate the required brightness, color and flashing frequency of the LED lamp beads of the active light-emitting sign device in real time based on the road environment data and traffic flow data, and transmit the calculated brightness, color and flashing frequency to the active light-emitting sign device through wireless communication;

[0023] An active light-emitting sign device includes a communication unit, an LED lamp bead and a microcontroller, wherein:

[0024] The communication unit is used to wirelessly receive the brightness, color and flashing frequency calculated by the traffic control center;

[0025] LED lamp beads are used to present corresponding brightness, color and flashing frequency according to instructions;

[0027] The microcontroller is used to adjust the LED lamp beads in real time according to the received brightness, color and flashing frequency.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] The brightness, color and flashing frequency of active luminous signs can be automatically predicted and adjusted based on real-time road environment factors and traffic flow data. It can provide personalized luminous parameter settings for different weather, time, road conditions and other factors to improve the adaptability of the signs.

[0030] Through accurate prediction and control, the sign can be prevented from continuously flashing at high brightness or frequently during unnecessary periods or conditions, which can effectively reduce the overall energy consumption of the sign and achieve energy conservation and environmental protection.

[0031] Reasonable adjustment of the brightness and frequency of signs can maximize the prompting effect and help drivers better perceive and identify traffic conditions. Especially in bad weather or at night when the visual environment is poor, it can enhance the prominence of signs and improve road safety.

[0032] Combining the luminous parameters of signs with traffic flow data can help traffic management departments better analyze and predict road network conditions, provide data support for dynamic traffic control, accident warning, etc., and promote the development of smart transportation.

[0033] It can be easily integrated into the existing traffic monitoring and control system. Model optimization and parameter adjustment can be performed according to needs, with good flexibility and scalability. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0035] Figure 1 is a flow chart showing an application method of an active luminous sign based on road environment and traffic flow according to an embodiment of the present invention;

[0036] Figure 2 FIG. 2 is a schematic diagram showing on-site use of an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0039] It should be understood that although the terms first, second, third, etc. may be used to describe ... in the embodiments of the present invention, these ... should not be limited to these terms. These terms are only used to distinguish .... For example, without departing from the scope of the embodiments of the present invention, the first ... may also be referred to as the second ..., and similarly, the second ... may also be referred to as the first ....

[0040] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0041] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0042] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0043] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0044] Embodiment 1

[0045] like Figure 1 As shown, the present invention discloses an application evaluation method of an active luminous sign based on road environment and traffic flow, comprising the following steps:

[0046] Step S101: using vehicle-mounted sensors and roadside monitoring equipment to collect road environment data and traffic flow data in real time, wherein the road environment data includes the temperature and real-time illumination of the road area;

[0047] Step S103, transmitting the road environment data and traffic flow data to a traffic control center;

[0048] Step S105: The traffic control center calculates the required brightness, color and flashing frequency of the LED lamp beads of the active light-emitting sign device in real time based on the road environment data and traffic flow data;

[0049] Step S107, transmitting the calculated brightness, color and flashing frequency to the active light-emitting sign device via wireless communication;

[0050] Step S109: The microcontroller of the active light-emitting sign device adjusts the LED lamp beads in real time according to the received brightness, color and flashing frequency.

[0051] Wherein, the step S105 includes: the traffic control center inputs the processed road environment data and traffic flow data into the optimal parameter model of the active luminous sign to calculate the required brightness, color and flashing frequency of the LED lamp beads of the active luminous sign.

[0052] Generally speaking, when the ambient temperature is high, the brightness of the active light-emitting sign will be relatively low. This is because high temperature will reduce the luminous efficiency of the LED light-emitting diode. On the contrary, when the ambient temperature is low, the brightness of the active light-emitting sign will be higher. This is because low temperature can improve the luminous efficiency of the LED.

[0053] Changes in ambient temperature will also affect the flashing frequency of active light-emitting signs. Generally speaking, when the temperature rises, the flashing frequency will decrease slightly. This is because the increase in temperature will reduce the operating speed of the LED drive circuit. Conversely, when the temperature decreases, the flashing frequency will increase slightly.

[0054] Different colors of LEDs have different luminous efficiencies at different temperatures. Generally speaking, the luminous efficiency of blue and white LEDs decreases faster at high temperatures, while red and green LEDs are less affected by temperature. Therefore, in high temperature environments, active luminous signs are more suitable for using red or green LEDs.

[0055] There are several main methods for collecting traffic flow data:

[0056] Sensors installed on vehicles, such as GPS and vehicle-mounted radar, can collect data such as vehicle speed and distance. The vehicle's driving trajectory and operating status data can be collected through mobile phone apps or vehicle-mounted terminals.

[0057] Monitoring equipment deployed along the road, such as video detection cameras and vehicle-mounted detectors, can monitor vehicle flow and speed in real time. The monitoring data is analyzed and processed using technologies such as image recognition and video analysis.

[0058] Using mobile phone signaling data, we estimate the traffic volume based on the coverage of the base stations of the three major operators. We also analyze the driving trajectory and route selection of vehicles through mobile phone signaling data.

[0059] Use electronic payment, ETC and other data to understand the traffic conditions of vehicles at toll booths. Categorize and count vehicle traffic according to different vehicle models and payment methods.

[0060] Sensor coils and piezoelectric sensors buried in the road surface can detect the passing of vehicles. Traffic parameters such as vehicle flow and speed can be analyzed through road sensor data.

[0061] Embodiment 2

[0062] The present invention proposes an application method of an active luminous sign based on road environment and traffic flow, comprising the following steps:

[0063] Step S101: using vehicle-mounted sensors and roadside monitoring equipment to collect road environment data and traffic flow data in real time, wherein the road environment data includes the temperature and real-time illumination of the road area;

[0064] Step S103, transmitting the road environment data and traffic flow data to a traffic control center;

[0065] Step S105: The traffic control center calculates the required brightness, color and flashing frequency of the LED lamp beads of the active light-emitting sign device in real time based on the road environment data and traffic flow data;

[0066] Step S107, transmitting the calculated brightness, color and flashing frequency to the active light-emitting sign device via wireless communication;

[0067] Step S109: The microcontroller of the active light-emitting sign device adjusts the LED lamp beads in real time according to the received brightness, color and flashing frequency.

[0068] For example, at night or in rainy weather, increase the brightness and flashing frequency of the sign to improve recognition.

[0069] On congested roads, adjust the color of the signs to red or yellow to warn drivers to slow down.

[0070] On accident-prone sections of road, increase the number of signs and the flashing frequency to guide drivers to drive carefully.

[0071] Wherein, the step S105 includes: the traffic control center inputs the processed road environment data and traffic flow data into the optimal parameter model of the active luminous sign to calculate the required brightness, color and flashing frequency of the LED lamp beads of the active luminous sign.

[0072] The optimal parameter model of the active luminous sign is obtained by training based on historical data of the road environment data and traffic flow data.

[0073] Wherein, assuming that the ambient temperature is T, the ambient light intensity is L, the traffic flow is Q, the flashing frequency of the active light-emitting sign light is f, the brightness of the active light-emitting sign is l, and the color of the active light-emitting sign is c, the optimal parameter model of the active light-emitting sign adopts the following formula:

[0074] Among them, a1,…,a9,b1,b2,b3 are regression coefficients.

[0075] Among them, the least squares method is used to fit the historical data to obtain a1,…,a9,b1,b2,b3.

[0076] Among them, suppose there are n sets of historical data (T i , L i , Q i , f i , l i , c i ), i = 1, 2, ..., n, find a1, ..., a9, b1, b2, b3 to minimize the following loss function:

[0077]

[0078] In order to minimize J, partial derivatives of a1, ..., a9, b1, b2, b3 are taken and set equal to 0, and a system of linear equations containing these unknown parameters is obtained. Matrix inversion is used to solve the values ​​of a1, ..., a9, b1, b2, b3.

[0079] The linear system of equations is expressed as follows:

[0080]

[0081] Combining these equations into matrix form:

[0082]

[0083] in

[0084]

[0085] Among them, step S109 includes that after the active luminous sign device receives the parameter data, it immediately updates the brightness, color and flashing frequency settings of its own LED lamp beads, and feeds back the current working status to the traffic control center.

[0086] The traffic control center regularly fine-tunes and retrains the optimal parameter model of the active luminous sign.

[0087] Embodiment 3

[0088] The optimal parameter model of the active luminous sign of the present invention can also use a multi-layer perceptron (MLP) neural network. In the following, the number of nodes in the input layer is 4, corresponding to 4 input features. There are 2 hidden layers, and the number of nodes in each layer is 64. The number of nodes in the output layer is 3, corresponding to 3 parameters that need to be predicted (brightness L, flicker frequency F, color C).

[0089] The input features of the input layer are 4, represented as x = [x1, x2, x3, x4].

[0090] The weight matrix of the first hidden layer Bias Vector

[0091] The output of the first hidden layer h (1) =σ(W (1) x+b (1) ), where σ(·) is the Sigmoid activation function, defined as

[0092] The weight matrix of the second hidden layer is Bias Vector

[0093] The output of the second hidden layer is h (2) =σ(W (2) h (1) +b (2) ).

[0094] The weight matrix of the output layer is The bias vector is

[0095] The output of the output layer is y = σ(W (3) h (2) +b (3) , where y=[y1, y2, y3] correspond to the predicted values ​​of brightness L, flicker frequency F and color C respectively.

[0096] Embodiment 4:

[0097] The present invention also proposes an application system of active luminous signs based on road environment and traffic flow, comprising:

[0098] Data collection equipment, which is used to collect road environment data and traffic flow data in real time, wherein the road environment data includes the temperature and real-time illumination of the road area;

[0099] A traffic control center, which is used to calculate the required brightness, color and flashing frequency of the LED lamp beads of the active light-emitting sign device in real time based on the road environment data and traffic flow data, and transmit the calculated brightness, color and flashing frequency to the active light-emitting sign device through wireless communication;

[0100] An active light-emitting sign device includes a communication unit, an LED lamp bead and a microcontroller, wherein:

[0101] The communication unit is used to wirelessly receive the brightness, color and flashing frequency calculated by the traffic control center;

[0102] LED lamp beads are used to present corresponding brightness, color and flashing frequency according to instructions;

[0104] The microcontroller is used to adjust the LED lamp beads in real time according to the received brightness, color and flashing frequency.

[0106] Embodiment 5

[0107] An embodiment of the present disclosure provides a non-volatile computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions can execute the method steps described in the above embodiment.

[0108] It should be noted that the computer-readable medium disclosed above may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in combination with an instruction execution system, device or device. In the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which a computer-readable program code is carried. This propagated data signal may take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. The computer readable signal medium may also be any computer readable medium other than a computer readable storage medium, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer readable medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0109] The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device.

[0110] Computer program code for performing the operations of the present disclosure may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (AN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0111] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some implementations as replacements, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0112] The units involved in the embodiments described in the present disclosure may be implemented by software or hardware, wherein the name of a unit does not, in some cases, limit the unit itself.

[0113] The above introduces the preferred embodiments of the present invention, which is intended to make the spirit of the present invention clearer and easier to understand, but is not intended to limit the present invention. All modifications, substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection outlined by the claims attached to the present invention.

Claims

1. An application method of active luminous signs based on road environment and traffic flow, characterized in that: The following steps are involved: Step S101: using vehicle-mounted sensors and roadside monitoring equipment to collect road environment data and traffic flow data in real time, wherein the road environment data includes the temperature and real-time illumination of the road area; Step S103, transmitting the road environment data and traffic flow data to a traffic control center; Step S105: The traffic control center calculates the required brightness, color and flashing frequency of the LED lamp beads of the active light-emitting sign device in real time based on the road environment data and traffic flow data; Step S107, transmitting the calculated brightness, color and flashing frequency to the active light-emitting sign device via wireless communication; Step S109: The microcontroller of the active light-emitting sign device adjusts the LED lamp beads in real time according to the received brightness, color and flashing frequency.

2. The method according to claim 1, characterized in that: The step S105 includes: the traffic control center inputs the processed road environment data and traffic flow data into the optimal parameter model of the active luminous sign to calculate the required brightness, color and flashing frequency of the LED lamp beads of the active luminous sign.

3. The method according to claim 2, characterized in that: The optimal parameter model of the active luminous sign is obtained by training based on historical data of the road environment data and traffic flow data.

4. The method according to claim 3, characterized in that: Assuming that the ambient temperature is T, the ambient light intensity is L, the traffic flow is Q, the flashing frequency of the active light-emitting sign light is f, the brightness of the active light-emitting sign is l, and the color of the active light-emitting sign is c, the optimal parameter model of the active light-emitting sign adopts the following formula: Among them, a1,…,a9,b1,b2,b3 are regression coefficients.

5. The method according to claim 4, characterized in that: The least squares method is used to fit the historical data to obtain a1,…,a9,b1,b2,b3.

6. The method according to claim 5, characterized in that Assume there are n sets of historical data (T i , L i , Q i , f i , l i , c i ), i = 1, 2, ..., n, find a1, ..., a9, b1, b2, b3 to minimize the following loss function:

7. The method according to claim 6, characterized in that: In order to minimize J, partial derivatives of a1, ..., a9, b1, b2, b3 are taken and set equal to 0, and a system of linear equations containing these unknown parameters is obtained. Matrix inversion is used to solve the values ​​of a1, ..., a9, b1, b2, b3.

8. The method according to claim 2, characterized in that: The step S109 includes that after the active luminous sign device receives the parameter data, it immediately updates the brightness, color and flashing frequency settings of its own LED lamp beads, and feeds back the current working status to the traffic control center.

9. The method according to claim 8, characterized in that The traffic control center regularly fine-tunes and retrains the optimal parameter model of the active luminous sign.

10. An application system for active luminous signs based on road environment and traffic flow, comprising: Data collection equipment, which is used to collect road environment data and traffic flow data in real time, wherein the road environment data includes the temperature and real-time illumination of the road area; A traffic control center, which is used to calculate the required brightness, color and flashing frequency of the LED lamp beads of the active light-emitting sign device in real time based on the road environment data and traffic flow data, and transmit the calculated brightness, color and flashing frequency to the active light-emitting sign device through wireless communication; An active light-emitting sign device, comprising a communication unit, an LED lamp bead and a microcontroller, wherein the communication unit is used to wirelessly receive the brightness, color and flashing frequency calculated by the traffic control center; LED lamp beads are used to present corresponding brightness, color and flashing frequency according to instructions; The microcontroller is used to adjust the LED lamp beads in real time according to the received brightness, color and flashing frequency.

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