352 results about "Green wave" patented technology

The invention discloses an intelligent coordination control method of a dynamic bi-directional green wave band for an urban traffic trunk road. The method comprises the steps of starting, processing coordination parameters, processing intersection parameters, processing time and processing cycle, etc. The method adopts a double-stage control structure, namely, a control layer of a traffic control center server and a control layer of an intersection intelligent signal controlling machine, through the information interaction and the coordination of the traffic control center server and the intersection intelligent signal controlling machine, phase sequence is optimized in an on-line manner; and common period, highway section upper phase difference, highway section down phase difference, the starting time of an upper coordination phase, the starting time of a down coordination phase, green ratio at each intersection and other key control parameters are optimized and calculated on a real-time basis. The intelligent coordination control method gets rid of the limit of equal intersection intervals required for the coordination control of the green wave band for the urban traffic trunk road, and realizes the unceasing travel of bi-directional traffic flows on the main road by applying the traffic engineering technique, the artificial intelligence technique and the automatic control technique, thereby reducing the parking rate while the traffic capacity of the trunk road is improved, and obviously reducing the traveling time.

The invention belongs to the field of traffic control and specifically relates to an efficient energy-saving speed guiding method based on the green wave control of urban trunk intersections. After the light color display situation of downstream intersections and the time needed by the dispersion of queuing vehicles behind stopping lines are synthetically considered, and the speed of traffic flows on urban trunks is guided from two aspects: when the condition that the vehicle can pass the downstream intersection at the current speed is detected, a stable driving speed is recommended to a driver, and if the vehicle is driven at the speed, the vehicle can pass the intersection controlled by downstream signals, without stopping; and when the condition that the vehicle can not pass the downstream intersection at the current speed is detected, an deceleration advice is given, the stopping and waiting time of the vehicle at the downstream intersection can be decreased as much as possible, and therefore, oil consumption is reduced. By using the method, the dispersion of vehicle queues can be avoided, the green light utilization ratio of the downstream intersection is increased, meanwhile, the purpose of umimpeded driving of the traffic flows on the trunk can be really achieved, and emission is decreased; and the speed guiding method has the advantages of simple control operation, good real-time performance and the like, and can efficiently guide the traffic flows on the urban trunks and improve the benefit of the green wave control.

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 an arterial road two-way green wave coordination control method in an entrance single release manner. The method comprises the following steps: determining an allowable variation range of a common signal period, computing an ideal intersection spacing with different common signal period values and in different signal phase sequence arrangement ways, determining an ideal phase sequence combination and an ideal common signal period of the arterial road intersection, and determining phase difference according to the direction of the intersections relative to the position of the ideal intersection, wherein, the step of computing an ideal intersection spacing with different common signal period values and in different signal phase sequence arrangement ways comprises respectively computing the ideal intersection spacing a by a time-distance graph based on the different phase sequence combinations of various intersections and the reference intersection; all of the distances d between the positions of various intersections and the position of the ideal intersection are 1/2v.C. The method can help enlarge a selection range for the value of the ideal intersection spacing, and is more applicable to the green wave coordination control of a plurality of arterial road intersections with different intersection spacings.

The invention belongs to the technical field of traffic, and provides a motor vehicle traffic control system which is mainly applied to a plane crossroad. The motor vehicle traffic control system is characterized in that a prepositioned stop line and a prepositioned signal lamp are additionally arranged before an existing crossroad stop line and an existing crossroad signal lamp. With linkage control of the prepositioned signal lamp and the crossroad signal lamp by a signal controlling machine, a crossroad green wave band is generated around the periphery of the crossroad so that passing capability of motor vehicles at the crossroad is enhanced.

The invention relates to a whole-journey independent phase green wave induction control method and a system of traffic flow, belonging to the technical field of traffic signal control. The method comprises the steps of: setting vehicle sensors and waveband signal indicator lamps along a road, setting parallel road induction stream signal indicator lamps and buffering yellow waveband signal lamps at intersections, transmitting a traffic flow signal and a green wave band control signal in a wireless manner, transmitting a traffic flow pulse signal to a computer for processing and pre-grouping the traffic flow, emitting a pre-grouping signal command, periodically turning on the waveband signal indicator lamps along the road to form a movable green wave band so as to guide the vehicles to travel and group the traffic flow, and matching the intersection signal lamps to realize whole-journey independent phase green wave induction control of the traffic flow. The system comprises a traffic flow signal collecting, traffic flow signal processing and controlling device, intersection signal lamps and control cabinets of the intersection signal lamps, the vehicle sensors and the waveband signal indicator lamps are arranged along the road, and the sensors and the indicator lamps are in wireless connection with the signal processing and controlling device. The method and the system, disclosed by the invention, have the advantages of realizing phase difference independent green wave band induction of vehicles and improving the intersection passing efficiency, etc.

The invention relates to a traffic signal coordination control optimization method for an emergency rescue vehicle driving path. The method comprises emergency rescue prioritization, path type classification, signal priority control, signal coordination control, and a bi-level programming model; relevant coordination control research on paths is conducted; first, emergency rescue characteristics and objects are analyzed, research on upper level dynamic phase difference and lower layer path green wave coordination in different path forms is conducted, and relevant case analysis and verificationare performed. The method disclosed in the invention is characterized by real time performance, traffic signal coordination priority control over an emergency rescue path can be exerted based on timewhen an emergency rescue team reaches a crossroad and real time vehicle load information of general vehicles, emergency rescue response time can be shortened, and casualties and property loss can beeffectively reduced.

The invention provides a varying-period signal coordinating and controlling method of road intersections. The method solves the problems that main road intersection signal coordinating and controlling methods in the prior art cannot flexibly conduct optimization or adjustment of the period, scheme and phase difference of traffic signal control in real time according to traffic flow changes. The method effectively improves the green light utilization rate and passing capability of road intersections, reduces the frequency of vehicle stopping, ensures main road green wave coordination and control effect, achieves quick transition of signal coordinating and controlling schemes at the same time, and eliminates influence to traffic caused during the scheme transition. The method monitors traffic flow data of each intersection in real time, calculates the optimal coordinating and controlling common period in real time, optimizes and adjusts city main road traffic signal coordinating and controlling schemes, selects the optimal phase difference, enables the main road traffic signal coordinating and controlling schemes to adapt to road traffic flow changes quickly, and thus improves the effect of main road traffic signal coordinating and controlling.

The invention discloses a green wave coordination control method for an artery facing to a running speed section. The green wave coordination control method comprises the following steps of: collecting speed samples of vehicles running on the artery; setting a normal variable section of the running speed; setting a mean design vehicle speed in a green wave coordination control manner; generating green wave coordination control alternative offers of the artery; evaluating the alternative offers according to distribution of the running speed samples; selecting an optimal green wave coordination control alternative offer of the artery; and drawing a green wave band time-distance graph and a running speed-green wave band width curve. The green wave coordination control method for the artery provided by the invention can meet the green wave coordination control requirements of a motorcade within a certain running speed section to the greatest extent, so that the vehicles of the motorcade in the running speed section can be located within green wave band width of the artery as far as possible; and the adaptability, robustness and the like of the green wave coordination control alternative offer of the artery can be improved.

The invention belongs to the technical field of traffic signal control and discloses a traffic green wave coordinated control technology for synergistic optimization of tidal lanes and direction-changing lanes, including the following steps: Step 1: judging whether the conditions for setting tidal lanes are met: The value divides the road congestion degree and service level into four grades and the unbalanced flow distribution coefficient: judge whether the service level is above three grades and the direction distribution unbalanced coefficient is >2/3. Step 2: Combine tidal lanes with variable traffic, and set up straight-left and straight-going traffic at the entrance of tidal lanes. When changing the direction of tidal lanes, set a 5-minute clearing time; In wave coordination, a half-period green wave coordination is proposed.

The invention discloses a method for setting bidirectional green wave signals for a bus trunk line. According to the method for setting the green wave signals, each signal lamp at an intersection is coordinated and controlled, the bus departure moment is adjusted by matching dispatching of a bus, and an optimal green wave signal set method for an urban bus system is calculated and acquired by adopting a corrected numerical solving method. By the method, the influence of green wave signal control at the intersection on the running efficiency of the bus system is fully considered; and buses quickly pass through the intersections in green wave by adjusting the signal phase difference between the intersections of the trunk and the departure time table of the urban buses. The method is convenient to calculate and strong in practicability, can greatly improve the operating efficiency of the urban bus system and bring great convenience to outgoing of urban residents, and has significance for improving the current situation of the urban buses.

This invention relates to an automatic control method for green waves of roadway signal lamps automatically controlled by computers, which can increase the usage efficiency of motor roadways and crosswalk: 1, increasing safety for foot passengers and reducing conflict between motor cars and passengers, 2, reducing interference of foot passengers to cars to ensure stability of motor flows, 3, much more benefit to the region control to city road traffic to realize green wave control to motor cars among city road crossings.

The invention belongs to a research of realizing green wave band traffic signal lights control based on urban traffic main line soft enclosing area video detection identification. Based on an existing point control and network control signal lights, passing vehicles driven into and out of soft enclosing areas are acquired, counted and analyzed in real time via counting technologies of radar, infrared, sensing, supersonic wave, etc. and technologies of vehicle license plate video identification and the like so that time proportion of a green light of a current crossing is adjusted, and the vehicles driven into the soft enclosing areas and the vehicles driven in straight lines from a former crossing green light can completely pass when the light of the current crossing turns green. The vehicles driven in the straight lines pass the current crossing when the light of the current crossing turns green, and the vehicles can also pass the next crossing with the light is green so that "all the way green" passage of bidirectional vehicle flow driven in the straight lines in main lines with the traffic signal lights is realized. Road segments between crossings are provided with the soft enclosing areas, which is firstly put forward by the invention so that waiting time of the vehicles stopping at the crossing with a red light is reduced, passing capacity of main line roads is enhanced and urban road traffic pressure is alleviated.

The invention relates to the field of traffic control, in particular to a method for dynamically dividing a traffic control region. The method comprises the following steps that rough division indexes of road segments between all adjacent intersections are calculated, primary division is carried out according to the rough division indexes, and the rough division indexes are determined according to distance, flow and cycle principles; descending sort is carried out on remaining road segments in the primary division according to the rough division indexes, traversal is started, the bandwidth reaching rate of green wave bands is used as division indexes, and fine division is carried out on sub-regions again; the sub-regions are dynamically regulated according to whether the bandwidth reaching rate of the green wave bands meets regulation conditions or not. The method has the advantages that the method of carrying out division two times is provided, a maximum green wave band optimization model is built based on the method, the sub-regions are divided more reasonably, the coordination control effect in the sub-regions is more effective, the bandwidth reaching rate of the green wave bands is used as the regulation conditions of controlling the sub-regions, the dynamic regulation between the sub-regions is further achieved, and traffic circulation efficiency is improved.

The invention discloses a green wave setting method for realizing streetcar interstation green-wave passage. The method comprises the following steps: collecting data of intersections along the line of streetcars and streetcar running data; determining an intersection timing plan according to the data of the intersections along the line of the streetcars and traffic flow of each intersection; setting up direction and car departing time, and determining time when the streetcars in up direction reach each intersection; determining streetcar pass phase position green light midpoint time and the car departing time of the streetcars in down direction; determining time of the streetcars in down direction reaching each intersection; and calculating the difference between the time of the streetcars in down direction reaching each intersection and the green light midpoint time, and determining time difference [delta]x of each intersection; and according to the time difference, adjusting the timing scheme of the intersection. The method prevents unnecessary parking of the streetcars at the intersections, thereby improving running efficiency of the lines; and with electric car running induction technology being combined, the streetcars are allowed to run according to set parameters, and punctuality rate of the streetcar is improved.

The invention discloses a method for evaluating an arterial green wave coordination effect based on a mobile terminal, and the method can output evaluation indexes on line in real time by adopting a green wave coordination effect evaluation algorithm and utilizing the intelligent mobile terminal. The method can obtain single-vehicle traveling data in real time through the intelligent terminal and realize real-time online evaluation of a green wave coordination effect of a single-vehicle test road segment in combination with a data processing algorithm and the green wave coordination control evaluation algorithm, and meanwhile, the evaluation method mainly has two evaluation modes which are drawing of a trajectory space-time diagram and output of the evaluation indexes respectively. Compared with existing common methods such as a manual research method, a single-vehicle test method, a floating vehicle method and the like, the method for evaluating the arterial green wave coordination effect based on the mobile terminal has the advantages of low manpower and material resource consumption, capability of giving out the effect evaluation indexes and optimization suggestions on line in real time, and the like, thereby having very high practicality and a wide application prospect.

The invention discloses a universal phase position type artery two-way green wave coordination control method. The method includes the steps of determining allowed signal phase position setting modes of the artery directions of various intersections, formulating a split allocation scheme of all the intersections in the different allowed signal phase position setting modes, determining value ranges of commons signal periods of arteries, calculating values of the different common signal periods and ideal intersection intervals in the different signal phase position setting modes, determining the best signal phase position setting mode of all the intersections of the arteries and the best common signal period of the arteries, calculating phase differences of all the intersections of the arteries and obtaining widths of two-way passing zones. The method cannot be limited by the signal phase position setting modes of the intersections of the arteries, can be applied to the optimization design of an artery two-way green wave coordination control scheme in various phase position setting modes and has good universality and a wide application range.

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 a multi-level radio network-based self-adaptive signal lamp system and a control method thereof. The system is characterized by consisting of a management terminal, a gateway electronic control unit (ECU), a signal driving test ECU, and a vehicle detecting ECU; in the invention, the gateway ECU, the signal driving test ECU, and the vehicle detecting ECU arranged at each intersection are respectively taken as a coordinator, a router and a terminal node of ZigBee network for performing network and layout; the excellent characteristics of radio sensing network, such as self-organization, multi-hop routing, etc. are kept; the integral robustness, reliability and maintainability are improved; and the construction and electrical wiring are simplified. The global system for mobile communications (GSM) interface of the gateway ECU makes the management terminal and a plurality of intersections realize a green wave band coordination control function in short message internet manner. Based on a hierarchical control system of a multi-level network structure, the system can be used for handling overall traffic flow intelligence dispersion on a large scale, and has the characteristics of capability of independent running at a single intersection and keeping system intelligence even a management terminal network system fails.

The invention relates to system and method for controlling artery green wave traffic signals based on an Internet of Things and belongs to road traffic technical field. The method comprises a signal control central server capable of acquiring vehicle information and flow information of correlative roads in real time from road monitoring systems and database servers which are arranged at various intersections. Thus, by means of the above information, the method may determine speed and time that a current vehicle flow passes two adjacent intersections. Further, the initial time and the duration time of green lights at various intersections in a green wave direction are optimized. Therefore, the setting of the green wave is more real-time and accurate. As a result, various emergent events can be well treated and a road passing efficiency can be greatly increased. The system for controlling artery green wave traffic signals based on an Internet of Things is simple in structure and low in cost. The control method is easy to implement and has a wide application range.

The invention provides a main line green wave speed induction system and a method based on mobile terminal GPS positioning. The system comprises a data acquisition unit, a GPS positioning unit, a data processing unit, and a display unit, and the data processing unit calculates the distance l from a vehicle to a downstream intersection via the real-time driving position of the vehicle and the time t=l/v for driving to the downstream intersection at the current speed, calculates display of each turning signal lamp of an entrance driveway and countdown conditions of the vehicle arriving time according to the driving time t for reaching the downstream intersection of the vehicle, and gives a speed suggested value or interval. According to the system and the method, the speed suggested value is pushed to the vehicle according to the vehicle positioning condition, the induction is more effective, targeted, and flexible, vehicle positioning data is acquired via a mobile terminal GPS so that the installation of a fixed vehicle detection device is not needed, and related information is displayed via a mobile terminal so that the installation of a fixed information publishing device at a roadside is not needed.

The invention discloses a traffic light green-wave vehicle speed inducing method and system based on V2I. A data processing unit obtains a speed suggestion value or interval, namely the green-wave vehicle speed, when the real-time distance L of a traffic light and vehicles, the corresponding vehicle speed V, and the display state and countdown time of a traffic light of a downstream crossing are collected by a collecting unit; a display unit displays the display state and countdown state of the traffic light of the downstream crossing and displays the speed suggestion value or interval obtained by the data processing unit; by means of the vehicle-road real-time bidirectional communication under the vehicle-road coordinative environment, through the state of the vehicles and the state of the traffic light of the downstream crossing where the vehicles are driven, the reasonable passing speed of the vehicles is calculated, the average travel time, average delay time and average parking frequency of the vehicles are effectively reduced, the passing capacity of the vehicles can be improved within the green-wave vehicle speed range, and meanwhile the time for waiting for the red light atthe crossing is shortened. The system is simple in structure and convenient to control and greatly improves the passing capacity of the road vehicles.

The invention provides a solution selection type trunk green wave configuration method and system. The method comprises the steps of generating a trunk information base; analyzing trunk traffic flow patterns according to current trunk traffic investigation situation, researching an intersection grouping solution during trunk green wave control in each pattern, and generating a trunk green wave configuration solution base; acquiring real-time trunk intersection traffic flow detection parameters, analyzing a real-time trunk traffic flow running pattern by similarity assessment, selecting an appropriate intersection grouping solution from the trunk green wave configuration solution base, thus realizing the configuration of trunk green wave parameters; and transmitting the generated real-time trunk green wave configuration solution to an intersection traffic signal controller to execute the solution. The solution selection type trunk green wave configuration method and system can meet the requirements of green wave configuration for instantaneity and validity, and can guarantee trunk green wave bandwidth and optimize the overall trunk traffic efficiency.

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.