24 results about "Traffic wave" patented technology

The invention discloses a double-lane road local road section single-lane alternate traffic signal dynamic timing method. The method comprises the following steps: determining a local road section traffic influence range of an event; collecting traffic flow data, and analyzing traffic flow characteristics; calculating a delay-based small vehicle equivalent quantity, and calculating a large vehicle adverse impact factor; constructing a signal dynamic timing method for alternate passage of road sections affected by double-lane road events; according to the method, a signal timing optimization model based on dynamic traffic flow characteristics is constructed, traffic flow data, including actual passing time, vehicle model proportion, actual arrival traffic volume and the like, of an event influence road section are collected in real time according to a special scene of an alternate passing road section of a double-lane road, and a signal period and a phase timing scheme are dynamically adjusted. The method can quickly adapt to the traffic fluctuation of the alternate passage road section, reduces the vehicle delay under manual command, improves the vehicle passage efficiency, and enhances the flexibility and dynamic adaptability of the signal timing of the alternate passage road section of the double-lane road.

The invention belongs to the technical field of intelligent traffic, and discloses a traffic state estimation and queuing state discrimination method based on a fuzzy traffic wave model, comprising the following steps: S1, collecting and preprocessing ETC gantry data, thunder-vision fusion trajectory data and artificial report event data, and extracting traffic flow parameters and event features after preprocessing; s2, fuzzy parameters are introduced to improve a traditional traffic wave model, the traffic wave velocity is calculated through the fuzzy parameters, wave front position transmission based on a state transition model is researched, and a fuzzy traffic wave model is constructed; s3, a VMD-GA-ConvLSTM network is constructed to carry out traffic state estimation; s4, determining a traffic state membership degree by adopting a GWO-FCM clustering algorithm, and judging a vehicle queuing state through an SVM classifier; and S5, improving the fuzzy traffic wave model in the network connection environment, and dynamically correcting the model from two dimensions of road section macroscopic characteristics and vehicle microscopic behaviors. The method provided by the invention can provide theoretical and technical support for accurate perception and dynamic regulation and control of the highway traffic situation.

The invention discloses a traffic jam detection and early warning method based on an unmanned aerial vehicle video stream, and belongs to the technical field of intelligent traffic. The system is combined with a floating vehicle triggering model, collects road videos in real time through an unmanned aerial vehicle, and realizes high-precision vehicle detection and tracking in combination with improved YOLOv8 and DeepSort algorithms; unmanned aerial vehicle data and floating vehicle GPS data are fused, three elements of traffic flow are quantified, and a dual-mechanism congestion detection model is constructed; respectively utilizing a GRU cooperative traffic wave theory to predict the congestion dissipation duration and utilizing an improved GRU + GCN model to predict the traffic situation; the signal lamps are dynamically regulated and controlled through multi-agent reinforcement learning, and active congestion relieving is achieved. The method has the advantages of wide-area coverage, high-precision perception and intelligent response, and the urban traffic control efficiency is remarkably improved.

The invention relates to a method for constructing a right-turn motor vehicle traffic capacity correction model under the influence of non-motor vehicle cross-line illegal parking, which comprises the following steps: taking two illegal parking characteristics of non-motor vehicle intrusion distance and illegal parking quantity as entry points, obtaining that two illegal parking factors both have influence on the speed of a right-turn motor vehicle through correlation analysis, and taking the right-turn speed as a dependent variable to obtain a right-turn motor vehicle traffic capacity correction model; and constructing a right-turn motor vehicle speed interference response model by taking the illegal parking quantity and the intrusion distance as independent variables. And based on the established speed interference response model, constructing a right-turn motor vehicle traffic capacity correction coefficient algorithm by applying a traffic wave theory and a gap acceptance theory, and integrating the right-turn motor vehicle traffic capacity correction coefficient algorithm into an HCM model to establish an improved HCM traffic capacity correction model. According to the method, the influence of the number, position and shape of non-motor vehicle cross-line illegal parking under different phases is considered, and reference is provided for traffic planning and road design.

The invention discloses an expressway traffic state estimation method and system fusing a traffic flow model and a graph neural network, and the method comprises the steps: discretizing an expressway into cells with a fixed length, and representing the traffic state of each cell through three parameters: flow, density and speed; determining an active influence region and a region which will be influenced of the cells in a time period by using the traffic wave velocity between any two cells, and establishing a cell traffic state space-time evolution model; converting the discretized cellular traffic state and the adjacency information into graph structure data, and designing a graph neural network to update all cellular traffic states; and based on the updated cellular traffic state, optimizing the cellular traffic state space-time evolution model by using a gradient descent method to obtain a highway traffic state estimation result. The expressway traffic flow time-space evolution modeling method can effectively improve interpretability, accuracy and generalization ability of expressway traffic flow time-space evolution modeling, and accurately grasp an expressway traffic flow time-space evolution mechanism.

Systems and methods are provided for activating mitigation strategies to reduce or eliminate the stop-and-go traffic. For example, the presently disclosed systems and methods can activate a mitigation strategy and operate a control vehicle in accordance with the mitigation strategy to reduce or mitigate stop-and-go waves within a defined control zone of a road segment. The mitigation strategy may comprise maintaining the vehicle at a reference speed.

The invention discloses a traffic wave space-time propagation law-fused signal lamp countdown estimation method, which comprises the following steps of: (1) dividing a target road section into a plurality of road section units at equal intervals, and dispersing a time axis into a plurality of time periods, so that the space-time is divided into a plurality of space-time grids; (2) calculating a grid state value used for representing the moving state of each detection vehicle on each space-time grid according to the instantaneous speed of each detection vehicle on each space-time grid; (3) establishing a signal lamp countdown estimation model fused with a traffic wave space-time propagation rule; (4) adding constraint conditions for the signal lamp countdown estimation model; and (5) solving the signal lamp countdown estimation model to obtain the optimal value of the decision variable, and calculating the signal lamp countdown according to the optimal value of the decision variable. The method is wider in application scene.

The invention discloses a traffic control subarea optimization and self-adaptive adjustment method and system, relates to the technical field of subarea optimization, and is used for solving the problem that the coordination effect in the peak period of traffic flow is poor due to the lack of dynamic response to real-time flow data when an existing traffic signal coordination system carries out regulation and control based on experience or a fixed algorithm. The coordination effect is quantified by calculating the overlapping length and the directional delay, so that the optimization process is more objective, the coordination effect of different initial phase differences can be quantified, the optimal initial phase difference is selected, a group of coordination control schemes is generated by considering the coordination of non-adjacent intersections, the problem of global incoordination caused by local optimization is reduced, and the optimization efficiency is improved. According to the method, factors such as path length and traffic flow weight are introduced, coordination deviation between local optimum and global optimum is calculated, coordination loss is quantified more accurately, a smooth transition strategy is adopted, and sudden traffic fluctuation caused by overlarge phase difference change is avoided.

This invention relates to the field of intelligent transportation technology, and provides a method and system for dynamic control of emergency lanes in highway accident scenarios. The method includes: acquiring accident reporting information; using a deep learning network model to predict the accident handling time; based on the accident handling time, using a traffic wave model to predict the queue length and dissipation time under the impact of the accident; using the queue length under the impact of the accident as the total length of the controlled road segment and discretizing it into segments; using the dissipation time under the impact of the accident as the control duration and intervalizing it; constructing a binary control strategy combining time windows and spatial segments; constructing an objective function with the goal of minimizing the weighted average of total travel time and total collision exposure time; solving the objective function using a Kriging surrogate model; and obtaining the dynamic control strategy for the emergency lane based on the binary control strategy. This improves the response speed of accident handling.

A system for longitudinal acceleration planning is disclosed. The system includes a plurality of sensors including at least one of a light detection and ranging (LiDAR) sensor or a radio detection and ranging (RADAR) sensor, at least one memory configured to store instructions, and at least one processor configured to execute the stored instructions to: (i) receive sensor data, from the plurality of sensors, representing respective acceleration and location coordinates of a plurality of vehicles travelling in a direction of travel of a vehicle associated with the system; (ii) based upon the received sensor data, determine a feed-forward parameter corresponding to a traffic wave representing the respective acceleration and location coordinates of the plurality of vehicles; and (iii) based upon the determined feed-forward parameter, determine and apply a required acceleration of the vehicle to maintain a distance and a pace with the plurality of vehicles.

The invention discloses a multi-mode traffic flow active regulation and control method for a bottleneck area of an expressway. The method comprises the following steps: constructing a hierarchical trigger mechanism based on a dynamic fluctuation matrix; cAV vehicles are screened through a conflict resolution model, a motion wave absorption control strategy is constructed, a control position and head vehicle selection are dynamically optimized, and traffic fluctuation energy is absorbed; a dynamic speed limiting model based on CAV permeability is established according to the hysteresis characteristic of the manually-driven vehicle, and the traffic flow state is adjusted in real time; a motion wave absorption control strategy and a dynamic speed limiting strategy are fused, a state space partition control method is provided, and layered treatment of free flow, a transition area and a congestion area is achieved; double-loop cascade feedback control is adopted to ensure the stability of the system, and an improved NSGA-III algorithm is combined to optimize control parameters to form an optimization-control-feedback self-closed loop mechanism. The method effectively improves the safety and passing efficiency of the mixed traffic flow through macro-micro cooperative regulation and control, and is suitable for a complex traffic scene in an intelligent network connection environment.

The present invention discloses a method for estimating the signal light countdown by integrating the spatio-temporal propagation law of traffic waves, which comprises the following steps: (1) equally dividing a target road section into a plurality of road section units, discretizing the time axis into a plurality of time periods, so as to divide the spatio-temporal into a plurality of spatio-temporal grids; (2) calculating a grid state value for characterizing the moving state of each detection vehicle on each spatio-temporal grid according to the instantaneous speed of each detection vehicle on each spatio-temporal grid; (3) establishing a signal light countdown estimation model by integrating the spatio-temporal propagation law of traffic waves; (4) adding constraint conditions to the signal light countdown estimation model; (5) solving the signal light countdown estimation model to obtain the optimal value of the decision variable, and calculating the signal light countdown according to the optimal value of the decision variable. The present invention has a wider applicable scenario.

This invention discloses a method for predicting highway congestion dissipation time that considers traffic event information. It utilizes detailed information from detected abnormal events to learn a decision tree model, thereby constructing a decision tree model that can predict the duration of the event. Simultaneously, it uses event reporting information to construct a capacity estimation model. Based on this, a congestion dissipation time prediction model based on a fuzzy traffic wave model is built. Combining the outputs of the above two parts with the fuzzy traffic wave model, a final congestion dissipation time prediction model for the event scenario is obtained. This invention effectively overcomes the limitations of existing congestion dissipation time prediction methods that do not adequately consider the specific circumstances of abnormal events. Furthermore, the use of a fuzzy traffic wave model fully considers the speed distribution differences during vehicle queuing, which are not adequately taken into account by traditional traffic wave models, thus achieving higher prediction accuracy and generalization ability for congestion dissipation time.

The invention discloses a signal lamp duration estimation method based on depth image prior guided by physical information, which comprises the following steps: constructing a space-time grid at a target entrance lane, and mapping vehicle position and speed information into a sparse queue contour image; constructing a depth image prior model, taking the sparse image as input, performing iterative optimization through fusion reconstruction, traffic wave physical constraint and signal control information composite loss, and repairing to obtain a complete queue contour; identifying a signal lamp state based on a stop line queue time sequence, combining continuous time periods, and calculating a red light, a green light and a period duration; according to the method, signal lamp time length estimation is reconstructed into sparse queue contour image restoration, a depth image prior model guided by physical information is combined, and periodic signal lamp time length estimation can be realized in fixed timing and dynamic timing scenes without depending on a large amount of historical annotation information.

The application discloses a highway traffic state estimation method and system fusing a traffic flow model and a graph neural network, and the method comprises the following steps: discretizing a highway into cells with a fixed length, and representing the traffic state of each cell by three parameters of flow, density and speed; determining the active influence area of the cell in a time period and the area to be affected by using the traffic wave speed between any two cells, and establishing a cell traffic state space-time evolution model; converting the discretized cell traffic state and adjacent information into graph structure data, and designing a graph neural network to update the traffic state of all cells; and based on the updated cell traffic state, using the gradient descent method to optimize the cell traffic state space-time evolution model, and obtaining the highway traffic state estimation result. The application can effectively improve the explainability, accuracy and generalization ability of the highway traffic flow space-time evolution modeling, and accurately grasp the highway traffic flow space-time evolution mechanism.

The invention belongs to the crossing field of an electric data processing technology and traffic and transportation engineering, and particularly relates to a macro-micro fusion trajectory reconstruction method applied to emission estimation. Comprising the following steps: S1, generating a regional macroscopic velocity field datum reference; s2, the operation condition of the floating car is corrected; s3, determining a candidate track set of a non-floating vehicle; s4, determining a final track of the non-lane-changing vehicle in the non-floating vehicles based on the candidate track; s5, determining a final track of the lane changing vehicle in the non-floating vehicles based on the candidate track; and S6, integrating the two types of tracks, verifying the operation condition, and generating a complete vehicle track. According to the method, trajectory evolution and traffic wave propagation trends can be effectively aligned, the space-time fineness of the reconstructed trajectory is remarkably improved, and accurate input is provided for high-resolution emission evaluation; meanwhile, the common unpractical speed or acceleration sudden change phenomenon in a traditional deterministic car-following model is effectively avoided; and meanwhile, the method has the advantages of efficient utilization of multi-source data, space-time continuity optimization and the like.

The invention relates to the technical field of intelligent traffic, and provides an emergency lane dynamic management and control method and system in a highway accident scene. The emergency lane dynamic management and control method in the highway accident scene comprises the following steps: acquiring accident report information, and predicting accident handling time by adopting a deep learning network model; based on the accident handling time, a traffic wave model is adopted to predict the queuing length and the dissipation time under the influence of the accident; taking the queuing length under the influence of the accident as the total length of a controlled road section, and performing segmentation discretization; taking the dissipation time under the influence of the accident as the management and control duration, and carrying out interval processing; constructing a binary management and control strategy combining a time window and a space segment; constructing a target function by taking weighted minimization of the total travel time and the total collision exposure time as a target; and solving the target function by adopting a Kriging agent model, and obtaining an emergency lane dynamic management and control strategy according to a binary management and control strategy. And the response speed of accident treatment is improved.

This invention relates to the field of smart city management technology and discloses an intelligent early warning method for a smart sanitation platform. The method acquires multi-source data from sanitation facilities, including sensor data, pedestrian flow data, meteorological data, and traffic data. It constructs an urban sanitation topology network, defining downstream nodes using pedestrian movement direction vectors and dynamically assigning edge weights. A spatiotemporal prediction model is used to aggregate features of the dynamic topology network to predict the time of garbage overflow. When the garbage enters the warning range, a vision-sensor mutual verification mechanism is activated, using a semantic segmentation algorithm to verify the accuracy of sensor data to generate a definitive warning. Finally, meteorological data is combined to calculate the garbage decomposition rate factor, and traffic fluctuations are considered to calculate the optimal interception time window to generate dynamic dispatch instructions. This invention can predict overflow risks in advance based on pedestrian flow trends, reduce false alarm rates, and achieve precise garbage collection and dispatch based on environmental conditions.

This invention belongs to the interdisciplinary field of electrical data processing technology and transportation engineering, specifically relating to a macro-micro fusion trajectory reconstruction method applied to emissions estimation. It includes the following steps: S1. Generating a regional macroscopic velocity field reference; S2. Correcting the floating car operating conditions; S3. Determining a candidate trajectory set for non-floating vehicles; S4. Determining the final trajectory of non-floating vehicles that have not changed lanes based on the candidate trajectories; S5. Determining the final trajectory of non-floating vehicles that have changed lanes based on the candidate trajectories; S6. Integrating the two types of trajectories, verifying the operating conditions, and generating complete vehicle trajectories. This method can effectively align trajectory evolution with traffic wave propagation trends, significantly improving the spatiotemporal precision of the reconstructed trajectory and providing accurate input for high-resolution emissions assessment; it also effectively avoids unrealistic speed or acceleration abrupt changes common in traditional deterministic car-following models; and it has advantages such as efficient utilization of multi-source data and optimization of spatiotemporal continuity.

The application provides a kind of intersection delay analysis method and device based on small sample rate floating car trajectory, belong to traffic engineering technical field, including obtaining the stop line of target intersection entrance lane;According to the directional distance information of multiple sampling points in trajectory data, determine the trajectory data of multiple vehicles;Construct space-time trajectory information, analyze the geometric characteristic parameters of space-time trajectory information;Multiple space-time trajectory information is superimposed to the same coordinate system, and multiple vehicle space-time trajectory graph is formed;According to the traffic wave information of multiple vehicle space-time trajectory graph, obtain signal interval information;According to geometric characteristic parameters and signal interval information, determine the delay index information of entrance lane;According to the delay index information of each entrance lane, total delay index information is obtained.The application can stably and accurately analyze the total delay index information of target intersection under the condition of sparse sample and without external data, which is convenient for large-scale deployment in actual road network.

The application discloses a signal lamp duration estimation method based on physical information guided depth image prior, which comprises the following steps: constructing a space-time grid at a target entrance, mapping vehicle position and speed information into a sparse queue profile image; constructing a depth image prior model, taking the sparse image as input, iteratively optimizing through a composite loss of fusion reconstruction, traffic wave physical constraints and signal control information, and repairing to obtain a complete queue profile; identifying the signal lamp state based on the queue time sequence at the stop line, merging the continuous time period and calculating the red lamp, green lamp and cycle duration; the signal lamp duration estimation is reconstructed as a sparse queue profile image repair problem, combined with the depth image prior model guided by physical information, without relying on a large amount of historical labeled information, the cycle level signal lamp duration estimation can be realized in the fixed timing and dynamic timing scenes.

The invention relates to a nonlinear hybrid traffic optimal interference suppression method based on strategy iteration, and belongs to the technical field of automatic driving, and the method comprises the following steps: S1, building an affine nonlinear dynamic model used for describing a hybrid traffic system through employing a leading cruise control (LCC) frame; s2, providing an optimal robust control formula for the nonlinear mixed traffic flow with external interference so as to optimize the attenuation performance; and S3, solving the optimal robust control formula of the mixed traffic flow proposed in the step S2 by solving the numerical value of the converted zero sum game. According to the invention, traffic waves can be effectively attenuated.

The application discloses a double-lane highway local section single-lane alternate traffic signal dynamic timing method, which comprises the following steps: determining the local section traffic influence range of an event; collecting traffic flow data and analyzing traffic flow characteristics; calculating the equivalent amount of small vehicles based on delay and the adverse influence factor of large vehicles; and constructing a signal dynamic timing method for the alternate traffic of the event influence section of the double-lane highway. The application constructs a signal timing optimization model based on dynamic traffic flow characteristics, collects the traffic flow data of the event influence section in real time, including the actual traffic time, the vehicle type ratio and the actual arrival traffic volume, dynamically adjusts the signal cycle and the phase timing scheme, and is suitable for the special scene of the double-lane highway alternate traffic section. The method can quickly adapt to the traffic fluctuation of the alternate traffic section, reduces the vehicle delay under manual command, improves the vehicle traffic efficiency, and enhances the flexibility and dynamic adaptability of the signal timing of the double-lane highway alternate traffic section.