199 results about "Green time" patented technology

A multiobjective management system for saturated traffic road networks comprising: green wave coordination of locally adaptive traffic control units, traffic movement optimization and live traffic route guidance. Current traffic congestion measurements on intersections are generated from local traffic cameras and remote air-borne conventional cameras and thermal sensing imaging cameras or satellite radar such as SAR / ISAR using optical image brightness analysis. At the first stage of traffic optimization, individual local intersection green times are computed based on current traffic congestion level. At the second stage optimization, the central traffic server uses a multiobjective approach to coordinate the current locally-optimized green times of the first stage and create input constraints for green-way coordination of plurality of traffic lights. The server updates dynamically current cycle start and green times on all network-connected traffic light controllers and also broadcasts recommended travel times, green times and green waves to all on-line client vehicle navigation units. Traffic server and individual client guidance units utilize novel time-dependent modifications of an A*-type algorithm to update current travel and recommended travel times and to execute fastest route searches.

The invention discloses a presignal-based active public traffic signal priority control method, which aims to ensure that the service level of public traffic vehicles which pass across crossings is improved to the greatest extent while the service level of social vehicles which pass across the crossings is not obviously reduced. The method comprises the following steps of: firstly, assembling detectors at the crossings which accord with conditions, and arranging a signal machine with computer programs and a signal lamp; secondly, setting green time differences between presignal stop lines andmain signals as well as between the presignal stop lines and presignals; thirdly, judging whether to give signal priority or not according to the operating states of crossings when the detectors detect a public traffic priority application; fourthly, judging the category of an active public traffic signal priority control strategy to be executed according to the current phase state; and finally, realizing signal priority service to the public traffic vehicles according to the control logic and the algorithm of three active public traffic signal priority control strategies of prolonging green light time, inserting public traffic phases and shortening red light time.

The invention discloses a method for controlling the signal priority of an emergency vehicle at an intersection based on a two-stage optimization process, which relates to a method for controlling the signal priority of an emergency vehicle at a road intersection, solves the problems that the emergency vehicle cannot be provided with absolute priority to pass by a condition priority control method in the prior art and is used for traffic control. The method comprises the following steps of: when the emergency vehicle requests the priority to pass the intersection, detecting the existence of the emergency vehicle and transmitting information to an intelligent signal controller subsystem; computing the time during which the emergency vehicle reaches the intersection from a detection position and the dissipation time of queuing vehicles in the entrance direction of the emergency vehicle according to the received emergency vehicle information and the information of the queuing vehicles onall driveways in different entrance directions so as to acquire the green time in other entrance directions; and providing the signal priority for the emergency vehicle according to the signal state at the current intersection so as to advance or delay the green time and reduce the delay time of other vehicles simultaneously.

The invention provides an arterial road green wave control method. The arterial road green wave control method is characterized by including the steps: building an arterial road dynamic green wave control model, and optimizing total delay time of vehicles passing through each road crossing by taking green time ratios of arterial road crossings under signal linkage control as variables; selecting multiple road crossings under signal linkage control and detecting real-time traffic flow of road segments among the arterial road crossings; solving the model according to the real-time traffic flow to obtain the green time ratio, shortest in total delay time, of each road crossing; making real-time timing plans according to the green time ratio of each road crossing. Traffic smooth rate can be increased by the arterial road green wave control method.

The invention discloses an intersection signal control method considering the priority of multiple buses. According to an intersection which the multiple buses probably pass by, a multi-objective planning model is established through the functional relationship between green time displayed at all phases, average delay of the buses, the phase time change amount and the lane saturability, and an exhaustion method is used for solving to obtain an optimal signal control scheme for the intersection in each period. According to the intersection signal control method, minimum average delay of the buses is considered, and meanwhile changes of original signals and influences on other lanes can be reduced; as a result, priority control over the buses and normal operation of the intersection are guaranteed, the bus travel time can be shortened for passengers, the attraction of a bus trip to citizens can be promoted, and urban traffic congestion can be relieved.

The invention discloses an urban express road intersection public transit priority signal coordinating and timing method which includes the steps: performing dividing and numbering for control areas, and dividing urban express roads under the tidal traffic flow actions into two types of control areas according to a fact that whether intersection downstream roads have bus stops or not; building traffic characteristics data sets; determining initial signal timing schemes comprising initial signal phase structures, initial signal control periods and initial phase green time of intersections; respectively constructing intersection public transit priority signal timing models for the two types of control areas, and calibrating model parameters; determining intersection public transit priority signal timing prioritization schemes, and determining public transit priority green time of the intersections and phase green time of the intersections by the aid of a 'value testing method'; determining an intersection public transit priority signal coordinating and timing scheme. Waiting delay of major traffic flow of the express road at the intersections is greatly reduced, and traffic efficiency is improved.

The invention relates to an intersection signal control system with the prompting function, which comprises an indicating device, sensors and a signal controller, wherein the indicating device comprises a signal lamp and an information prompting board for displaying intersection state prompting information; the sensors are arranged on a road section run by vehicles which do not pass through an intersection stop line and comprise a main sensor and an auxiliary sensor, the auxiliary sensor is arranged between the main sensor and the stop line, the main sensor is used for detecting whether the vehicles arrives or not and sending detected information, and the auxiliary sensor is used for detecting whether the vehicles is passing through or not and sending detected information; and the signal controller is used for controlling the signal lamp to change and controlling the information prompting board to display corresponding text prompting information. By the intersection signal control system, the problems of uncertain green time of an intersection signal control system adopting an inductive control mode and inapplicable countdown display mode of the signal lamp in the prior art are solved, so the intersection signal control system is suitable for the inductive control mode and has the prompting function.

The invention discloses a quick bus signal priority cooperative control method of primary and secondary crossings, and is applied to a BRT (Bus Rapid Transit) system. The method comprises the steps that a plurality of detectors are arranged at setting positions of primary crossings for predicting the arrival time of buses in advance, the corresponding signal phase lengths of the crossings are adjusted in proportion, and the signal lamps of the crossings are controlled; and simultaneously, for the secondary crossings, the bus stop delay is converted into a space length, and cooperative control is carried out by amending the space distance in a path section and calculating green time difference. The method overcomes the disadvantage that a traditional signal priority control method does not consider crossing cooperation, and the total traffic efficiency of main line can be enabled to be optimal.

A kind of traffic control method that guarantees viaduct is unimpeded, comprises the following steps: (1) establishes viaduct main line real-time traffic state model: install signal light, traffic flow detector at each ramp entrance and ramp exit, and described signal light and traffic flow detector are all Connect with the signal control server; a viaduct is divided into N controllable units by the ramp, N is a natural number, and the main line section of the viaduct between two adjacent ramps is determined as a controllable unit; (2) Based on traffic capacity-saturation (3) On-ramp control process: The cycle of the on-ramp regulation signal of the controllable unit i has two phases, that is, there are green lights and red lights for allowing vehicles to enter the viaduct and forbidding vehicles to enter the viaduct respectively Indicates that the base determines the green light time tg and the red light time in the time period [KT, (K+1)t]. The invention has good real-time performance, good control effect and good adaptability.

The invention discloses a dual-target-optimization-based dynamic timing method for an urban traffic signal lamp. The method comprises: a green time ratio, maximum green light time, minimum green light time, and a signal cycle T of an intersection are designated primarily and a conversion step length B is designated; during the given signal cycle T, a green light signal of the intersection is turned on successively according to a phase; traffic data at the intersection are monitored in real time, and a green light phase vehicle queuing length p and a vehicle queuing length q of a next green light phase of the intersection are calculated, and a fuzzy logic controller adjusts green time ratios u of all phases of the intersection in real time; and a traffic flow of the intersection is calculated, and a cycle optimization controller determines a signal cycle value T' at a next stage and green light time gei' of all phases. According to the invention, the average number of times for parking and average delay time can be reduced effectively; the road traffic passing efficiency is improved; control of the traffic control system becomes reasonable; and the traffic congestion phenomenon is alleviated fundamentally.

The invention relates to a bus signal priority control method based on an RFID vehicle-mounted electronic label. The RFID electronic label is a taken as an information intermediary, and a bidirectional communication between public transport vehicles and a crossing control layer can be established; through guiding the public transport vehicles to reach and pass across a crossing appropriately, the road section travel speed of the bus is changed from priority model input to model output, and a signal control system is converted from adapting to the arrival of a traffic flow passively to guiding the traffic flow to arrive at and pass across the crossing, thereby giving full play to the efficiency of a control model and realizing maximization of system benefit; considering from the aspect of controlling the crossing control layer of the system, signal timing plan, suggested speed, station lingering time and other control parameters and the like core jobs are calculated, and a priority control scheme can be carried out through the communication with the RFID electronic labels, so that efficiency of processing priority algorithm of the crossing control layer can be improved, average vehicle delay and average parking frequency of the public transport vehicles are reduced to the maximum degree, and green time utilization rate is improved.

The invention discloses a method for releasing right-turn vehicles to pass through a signalized intersection on a short lane under mixed traffic and a control system thereof. The control system comprises a traffic sign marked line, detection equipment, a canalization measure and a signal control facility. The system-based releasing method comprises the following steps of: after the short lane is full of the right-turn vehicles, providing green time for the right-turn vehicles to pass, and stopping releasing straight-going non-motor vehicles on the same side; after the vehicles queuing on the short lane are emptied, releasing the straight-going non-motor vehicles, stopping left-turn vehicles in a left-turn waiting area; and when a detector detects that the short lane is full of the right-turn vehicles, releasing the right-turn vehicles again, and prohibiting the straight-going non-motor vehicles from passing. Through the technical scheme, (1) conflict between motor vehicles and the non-motor vehicles is avoided, and the safety of the intersection is improved; (2) the utilization rate of the green time and the short lane is improved; (3) the delay of the right-turn vehicles and the non-motor vehicles is reduced, and the passing capacity of the intersection is improved; and (4) the traffic management of the intersection is more humanized.

The invention discloses a single point signal control optimization method based on intersection vehicle passing records. The vehicle passing records of the stop line of entrances of an intersection in all directions are acquired. A vehicle passing signal timetable is generated. According to the signal timing phase, lanes are grouped. A lane with the maximum passing vehicles in a cycle is selected as the key lane of the lane group in the cycle. A key lane vehicle passing signal map and a headway time signal map are generated. Two maps are combined to analyze the queuing situation after the stop line and the vehicle traffic during green time. The green time utilization index of the corresponding phase is analyzed. Statistical analysis is carried out on the green time utilization rate in each cycle. Based on a statistical analysis result, if green time surplus exists in the green time utilization rate in each cycle, the green time is shortened. The method can be used to analyze the effect of the existing timing scheme of the intersection based on the vehicle passing monitoring result of an intelligent bayonet, and can carry out effective signal timing optimizing accordingly.

The invention discloses an intersection signal timing optimization method based on the queue length of vehicles. The maximum queue length is calculated according to the queue length of the vehicles at the end of a red light, according to the maximum queue length, green time required by a phase position is calculated, according to the green time of the phase position, a signal timing dual-loop structure is optimized, and a nesting phase position is made; compared with classical time-headway-based inductive control, the method obtains a better effect, is not sensitive to queue length error estimation, and can still obtain a good control effect even if some errors exit.

The invention discloses a traffic control method for dynamic coordination according to effective capacity of a road section. The method comprises the following steps of: first, proposing an effective bandwidth evaluation method to monitor the running state and the control effect of the existing trunk-road green-wave coordinating and controlling system; and second, learning from a TCP / IP (Control Protocol / Internet Protocol) window flow control thought, and designing a window-flow-controlled trunk-road dynamic coordinating and controlling method to control the crowed traffic flow of urban trunk roads. Simulation tests and compared results show that a downstream intersection can inform the effective capacity of the road section to an upstream intersection in real time in a mode of a window flow notice, and a traffic signal machine of each intersection can conveniently redistribute the green time of each traffic flow according to the current traffic demand and the effective capacity of the road section to avoid the overlong green time to cause queuing vehicles in the road section to overflow.

The invention discloses an urban trunk road two-way green wave control optimization method based on a road section speed interval. Through historical vehicle driving speed data, a driving speed fluctuation interval is quantized, and phase green time is coordinated and phase difference parameters are optimized in a condition in which the vehicle speed is uneven. On the basis of fully considering road section speed stochastic fluctuation and non-coordinated phase passing requirements, a trunk road two-way coordination control optimization method with maximization of a green wave band width between adjacent two crossings as a target is brought forward, overlapping test is carried out, and thus a phenomenon that the green wave band may be broken can be prevented. Defects that an average vehicle speed assumption is adopted traditionally, and unevenness of the vehicle speed is neglected are overcome, the trunk road traffic flow operation efficiency can be effectively enhanced, operability of actual applications can be ensured due to good practicality features, and positive significance is provided for building an urban road traffic signal control optimization system and enhancing an urban traffic management and control level.

The invention discloses an urban road traffic control method which comprises the following steps (1) acquiring traffic information of a road junction by an information acquisition device, detecting vehicle information, and computing lane occupancy ratio, an average speed V of a single vehicle and a detection distance L; (2) computing green time S of a single lane; (3) dividing a signal cycle into an east-west release phase and a south-north release phase; wherein, the east-west release phase is divided into an east-west left-turn phase and an east-west straight phase; the south-north release phase is divided into a south-north left-turn phase and a south-north straight phase; if the left-turn lanes and straight lanes in east, south, west and north directions are represented by 1 to 8, and the green time of each lane is S1 to S8 accordingly; the S1 to S8 are respectively computed according to a formula (1) to control the green time of the road junction. The urban road traffic control method acquires and processes car flow information in real time, has high accuracy and effectively utilizes road traffic capacity.

The invention relates to an adjacent intersection bidirectional linkage control method in consideration of dynamic queuing length, and belongs to the technical field of traffic control. The adjacent intersection bidirectional linkage control method in the consideration of the dynamic queuing length includes steps: A, confirming linkage control adjacent intersections and linkage control traffic streams; B, confirming a single point control signal cycle of the linkage control adjacent intersections; C, confirming linkage control public cycle duration; D, calculating effective green time of each phase position of the linkage control adjacent intersections; E, calculating a practical unidirectional optimum phase difference interval of upstream and downstream directions of the linkage control traffic streams; F, confirming an optimum phase difference of the bidirectional linkage control intersection. The adjacent intersection bidirectional linkage control method in the consideration of the dynamic queuing length is suitable for linkage signal control of the adjacent signal control intersections in an urban road network, decreased times of delaying and parking of linkage control vehicles, improves utilization efficiency of a green light, improves traffic signal linkage control effects, and has practical engineering applying value on the aspect of urban road network traffic signal control.

The invention discloses a coordination control method of a dissymmetric artery. Dissymmetric phases are designed according to a flow ratio of each strand traffic flow in the artery, the flow ratio of the traffic flow in the same phase is guaranteed to be close to the greatest extent, and waste of green time is reduced; in order to improve the utilization efficiency of the green time and guarantee the normal operation of each strand traffic flow at the same time, a computing method of each phase green time permitting intervals is set; a one-way coordination control best phase difference is put forward according to a gap of intersection, traffic flow travel speed and time needed by queued vehicle releasing of the coordination phase traffic flow in red time; at last the phase and phase sequence of the intersection, the coordination phase difference and the coordination green time are ensured according to each phase green time permitting intervals and the one-way best phase difference. The coordination control method can optimize a bi-directional coordination control effect when the artery traffic flow is in an unbalancing state, the phenomena that vehicles in the artery are delayed are reduced, and the utilization efficiency of a green light is improved. The coordination control method has practical engineering application value in an aspect of urban road traffic control management.

The invention discloses a green wave bandwidth maximization-based artery green wave coordination control timing method. The method comprises the following steps: (1) investigating geometry setting parameters and basic timing parameters at signal intersections of an artery, and calculating conversion distances Di between the intersections; (2) calculating the value ranges and the iterative steps of ideal signal distances to obtain a value set A of the ideal signal distances; (3) partitioning the relative positions of ideal signals, based on the calculating rule of green wave loss, calculating the largest green wave bandwidths GWBj of the artery under all possible ideal signal distance values Aj; (4) selecting the largest value among GWBj as the optimal green bandwidth GWB*, and calculating the green time difference of each intersection so as to obtain a coordination control timing scheme with the largest artery green wave bandwidth.

The invention provides a unidirectional trunk line green wave coordination control self-adaptive adjusting method, which completes identification and detection of vehicle information by adopting a video identification technology, calculates a traffic flow density when detecting an average speed of the vehicles, adjusts a green time ratio of an intersection according to the traffic flow density, reasonably allocates road resources, accelerates the emptying of queuing vehicles in a branch, reduces interference of vehicle incoming and outgoing of the branch on a green wave effect, and optimizes agreen wave implementation effect. The unidirectional trunk line green wave coordination control self-adaptive adjusting method has the beneficial effects of monitoring traffic flow conditions arriving at the intersection in real time by adopting a video identification technology, dividing a vehicle queuing region, starting green wave signal self-adaptive adjustment when the vehicles in the queuing region exceeds a set threshold value, identifying and recording license plate numbers of the queuing vehicles, measuring and calculating an average driving speed of the vehicles in the road sectionwhen the vehicles arrive at a downstream intersection, predicting a time when the queue arrives at a next intersection, and adjusting a phase difference according to a preset strategy. The unidirectional trunk line green wave coordination control self-adaptive adjusting method achieves the purpose of reducing the average delay time of the vehicles so as to improve road traffic passing capacity andreducing urban traffic pollution.

The invention discloses an urban trunk one-way green wave control optimization method considering vehicle speed non-uniformity. An unequal saturation signal timing idea is adopted to provide a flexible adjustment and optimization space for coordinated phase green time, and optimization of coordinated phase green time and phase difference parameters under the condition of non-uniform vehicle speeds is realized through a quantified vehicle speed fluctuation interval. The uncertainty of traffic flow operation state is integrated in the bandwidth maximization optimization process, the defect that a traditional method cannot consider both optimization of trunk intersection signal cycle and green time, adopts the assumption of average vehicle speed and ignores vehicle speed non-uniformity is overcome, the capability of trunk one-way green wave coordinated control to resist external interference can be effectively enhanced, the operation efficiency of trunk traffic flow is improved, good real-time and practical properties ensure the operability of actual applications, and the method plays a positive role in urban road traffic signal control optimization system construction and urban traffic control level upgrading.

The invention discloses a traffic signal coordination control method for urban road, belonging to the intelligent traffic signal system control technology field. The intersection signal coordination control optimization method based on inductive control model comprises the steps as follows: combining with the flexibility character of the inductive control and the line coordination control principle, providing the intersection signal coordination control optimization method based on inductive control model, giving the corresponding switching method and optimization method. The method can respond the vehicle arriving information of each phase of each crossing, determine the phase switching method according to the coordination phase working time, non-coordination phase working time and phase difference; the method is used for coordination control for the urban road, compared with the conventional green wave band control, the green time is saved, the vehicle queuing length is reduced and the road capacity is improved.

A green tire (20) is put into a mold (16) in which an insert core (18) and a bladder (22) are accommodated. In the putting operation, a diameter of the insert core (18) is reduced and the bladder (22) is contracted. After the putting operation, the diameter of the insert core (18) is increased so that an inner surface of a bead (8) of the green time (20) abuts on an insert core plate (36). The bead is interposed between the insert core (18) and a cavity surface (34). By filling a gas, the bladder (22) is gradually expanded. The mold (16) is clamped so that an internal pressure of the bladder (22) is further raised. A portion of an inner peripheral surface of the green tire (20) which does not abut on the insert core (18) abuts on the bladder (22). The green tire (20) is heated by a thermal conduction from the mold (16) and the bladder (22).

The invention discloses a bus priority signal control method based on multiple requests in a vehicle networking environment, aiming at overcoming problems that a current bus priority signal control method has low prediction precision and cannot satisfy priority of multiple buses. The bus priority signal control method based on multiple requests in the vehicle networking environment includes the following steps: 1, collecting real-time information in the vehicle networking environment, and detecting multiple bus priority requests; 2, determining running statuses of the buses and determining whether the bus is behind a timetable; 3, predicting the time when the bus arrives at an intersection; 4, determining a signal control scheme that satisfies priority of multiple buses, including 1) solving green time required to meet the priority requests of multiple buses, 2) calculating a bus priority signal control scheme for a current period, 3) solving a signal control scheme of the next periodbased on a green time compensation algorithm, 4) calculating total delay of the intersection of each signal control scheme, and selecting the priority signal control scheme with the smallest delay.

The invention discloses a traffic signal coordination control method of an arterial street under a super saturation traffic state. The traffic signal coordination control method of the arterial street under the super saturation traffic state includes steps: confirming a key intersection on the arterial street, and selecting straight running phase positions of all intersections on the arterial street, which provide traffic rights for straight running vehicle flows along the direction of the arterial street, as coordination phase positions; using a green light start moment of the coordination phase position of the key intersection as a benchmark, and sequentially confirming green light start moments of the coordination phase positions of the other intersections when the other intersections coordinate along the direction of the arterial street by using green time ratios of the coordination phase positions of all the intersections on the arterial street and phase difference between each two adjacent intersections. The traffic signal coordination control method of the arterial street under the super saturation traffic state achieves orderly running of the vehicle flows on the arterial street under the super saturation traffic state by building a bidirectional red wave interception coordination band, not only improves running safety of vehicles on the arterial street, but also simultaneously can effectively prevent and evade back overflowing of the arterial street vehicle flows, caused among the intersections along the arterial street under the super saturation traffic state, and can effectively prevent traffic jams possibly caused by the back overflowing from spreading towards the adjacent intersections or adjacent arterial streets.

The invention discloses a real-time traffic sign control method of a group intersection and a method for predicting green time needed for dredging a vehicle stream at the intersection. The methods comprise the following steps of: distinguishing main vehicle stream paths at the group intersection, configuring the time phases of the main vehicle stream paths according to vehicle stream paths; and then, by virtue of a contour principle, setting at least one vehicle detector on each main vehicle stream path to detect the vehicle stop waiting conditions of the main vehicle stream paths; furthermore, obtaining various impact waves according to the vehicle stop waiting time conditions; further, predicting the green time needed by each vehicle stream path by means of an impact wave principle; and finally, optimally distributing the predicted needed green time so as to obtain the balanced green time of each main path.

The invention discloses a bus priority signal control method not involved with a bus lane. The bus priority signal control method not involved with the bus lane comprises the steps that (1) a bus priority request is detected, (2) bus arrival information is extracted, (3) the time for a bus to reach a stop line of an intersection is estimated by a signal control machine according to the serial number information, the positional information, the direction information and the speed information of the bus, (4) the priority time required by a phase position is calculated, (5) the shortest green time and the longest green time of the phase position are set, and (6) the signal control machine controls a signal lamp to be turned on according to a bus priority signal control rule. The bus priority signal control method not involved with the bus lane is suitable for being used under the condition that buses come in multiple directions or under the condition that multiple buses come in one direction, calculation is conducted based on the floating car theory, so that when certain buses stop or new bus priority requests are received, the bus arrival time can be re-calculated and updated, the strategy is adjusted rapidly, the calculation speed is high, the real-time performance is high, and the accuracy is high.

The invention discloses a setting system and method for same-phase turn-right and pedestrian signals of an independent intersection. The system comprises an image collection module used for collecting image signals of street-crossing pedestrians in pedestrian standing areas on two sides of a pedestrian crossing and transmitting the signals to an image processing module; the image processing module used for transmitting a maximum value of the number of pedestrians waiting to cross the street to a traffic signal controller; a vehicle detector used for transmitting the number of vehicles waiting to turn right to the traffic signal controller and simultaneously collecting a newly-added number of the vehicles turning right in real time when a turn-right signal lamp is green; the traffic signal controller used for calculating a pedestrian street-crossing signal lamp green time Gp and a turn-right vehicle signal lamp green time TR and then transmitting signal control instructions to the traffic signal controller; and a signal controller used for controlling the time of the signal lamps for street-crossing pedestrians and turn-right vehicles. By adopting the setting system and method, the high-speed passing of vehicles and pedestrians at the independent intersection is realized.