CN102592459A - Green wave signal control method in bus system area - Google Patents
Green wave signal control method in bus system area Download PDFInfo
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Abstract
The invention discloses a green wave signal control method in a bus system area. The green wave signal control method in the bus system area comprises the steps of: firstly, dividing routes in the area into transverse routes and lengthways routes; then calculating a regular timing scheme by using a Webster signal timing method; determining a key period based on an average delay time which is taken by a bus to stop at bus stops for loading and unloading passengers and an average time length which is taken for passing through crossings; converting the delay time to a spatial distance; determining a virtual road network and gridding the area; alternately arranging transverse periods and lengthways periods of each grid cell; adjusting signals by using a mathematic solution way to guarantee bus green waves; and finally determining a first bus time, a last bus time and a departure interval based on a signal period and a change rule. Through signal coordination control and bus scheduling in the area, the control method provided by the invention, has the advantages of guaranteeing bus green wave passing in the whole region, reducing delay of the bus system and improving service level of the bus system.
Description
Technical field
The present invention relates to the urban road transportation control technology; Relate in particular to a kind of through regional signal coordination control and bus dispatching; Guarantee that the green ripple of whole regional public transport is current, reduce the delay of public transit system, promote the green ripple signal control method in public transit system zone of public transit system service level.
Background technology
Along with the fast development of urban economy, the continuous expansion of population size, more and more receive people's favor as the public transport of big transport power.Yet existing public transit system receives the restriction of aspects such as road, signal, scheduling method, and operational efficiency is not high, and the green ripple notion of public transport is arisen at the historic moment.
The intension of the green ripple of public transport is: except the parking of bus station, there are other parkings in bus in the process of moving hardly; Block by nothing through each crossing, and do not run into red light.The green wave energy of public transport reduces the delay of public transit system operation greatly, greatly improves the service level of public transport.。
Yet the superiority of the green ripple of public transport relies on the guarantee of signal and right of way to a great extent.Existing technology and patent rest on the single line controlling layer more, and it is preferential to be difficult to form effective regional signal, and consider very few to the public bus network that turns to.Through inventor's discovery that studies for a long period of time, through the unified regional signal cycle, regulate all directions split, coordinate means such as departure interval and can realize taking into account the green ripple control of regional bus signals public transport and turn to problem, thereby improve public transit system operation ability greatly.
Summary of the invention
Goal of the invention: in order to overcome the deficiency that exists in the prior art; The present invention provides a kind of public transit system zone green ripple signal control method; Through modification and the adjustment to the signal lamp timing parameter of signalized intersections, design is fit to the current network control scheme of public transit vehicle, makes the normal operation of signalized intersections be able to guarantee; Weakened the influence of signal lamp as far as possible, improved the efficiency of operation of public transit vehicle simultaneously driving speed; The signal controlling of isochrone road network makes the application of road line traffic control be able to promote, and has enlarged the scope of green ripple control, lets the contact between the public bus network be able to strengthen, and is unimpeded the laying a good foundation of public transport in circuit transfer, realization zone.
Technical scheme: for realizing above-mentioned purpose, the technical scheme that the present invention adopts is:
The green ripple signal control method in a kind of public transit system zone comprises the steps:
(1) confirms the public bus network classification indicators, will plan that the zone contains all roads that " " public transport passes through according to trend, is divided into two types of transverse line and vertical lines; The normal signal timing is independently carried out according to the magnitude of traffic flow in all crossings, and signal period length is C
Ij, C wherein
IjRepresent horizontal i, the individual intersection signal Cycle Length of vertical j;
(2) according to the signal period length C of each crossing
Ij, public transit vehicle bus stop on-board and off-board mean delay time T
DelayWith through the average duration T in crossing
Pass, confirm horizontal ordinate road key signal Cycle Length C
0 horizontal stroke=C
0 is vertical, and with total key signal Cycle Length C
0=C
0 horizontal stroke+ C
0 is verticalSignal period length as each crossing;
(3) the travelling speed v of preset horizontal ordinate road bus
Horizontal=v
Vertical=v=30km/h is with public transit vehicle bus stop on-board and off-board mean delay time T
DelayWith through the average duration T in crossing
PassConvert unit length L into
Delay=T
Delay* v, L
Pass=T
Pass* v adds original road correspondence position to as virtual segment, obtains virtual road network;
(4) divide grid sub-district, horizontal ordinate road jointly according to the travelling speed and the signal period length of preset horizontal ordinate road bus, and same sub-district C
0 horizontal strokeOnly serve transverse line, C in signal period
0 is verticalOnly serve vertical line in signal period, the horizontal vertical cycle hockets, and alternately once is a total key signal cycle C
0Adjust the travelling speed v of horizontal ordinate road bus
Horizontal, v
Vertical, make the transverse line bus just operates in horizontal signal period of sub-district, the vertical line bus just operates in the sub-district longitudinal signal in the cycle;
(5) adopt algebraic method that the normal signal timing scheme of every public bus network is adjusted, to satisfy the green ripple requirement of public transport mongline bidirectional;
(6) require the comprehensive bus departure interval of confirming according to signal period length, bus passenger flow; Confirm bus departure interval and first last frequency according to the signaling plan of grid sub-district, horizontal ordinate road.
Said step (1) comprises the steps:
(1-1) confirm the public bus network classification indicators: at first all public bus networks are numbered; Confirm circuit start the trend with the direct north corner dimension; Is vertical line with 45 ° of norths by west to all circuits in the 45 ° of scopes in north by east, and all the other direction circuits are transverse line;
(1-2) confirm the normal signal timing: according to the magnitude of traffic flow, adopt Robert Webster signal timing dial computing method according to each crossing, successively confirm the signal period C of each crossing
Ij, each crossing out of phase key flow flow rate ratio
The split of each phase place of crossing
And the shortest green light duration
Wherein,
The volume of traffic of representing l phase place key flow of the crossing that horizontal i is individual, vertical j is individual,
L phase place split representing the crossing that horizontal i is individual, vertical j is individual,
L phase place green light duration representing the crossing that horizontal i is individual, vertical j is individual.
Said step (2) comprises the steps:
(2-1) more horizontal ordinate road intersection signal Cycle Length C
Ij, confirm that the longest crossing of signal period is crucial crossing, its signal period length is unidirectional alternative key signal Cycle Length C '
0=maxC
Ij
(2-2) according to unidirectional alternative key signal Cycle Length, public transit vehicle bus stop on-board and off-board mean delay time T
Delay, through the average duration T in crossing
Pass, calculate unidirectional key signal Cycle Length C
0 horizontal stroke=C
0 is vertical=max (C '
0, T
Pass+ T
Delay);
(2-3) with total key signal Cycle Length C
0=C
0 horizontal stroke+ C
0 is verticalSignal period length as each crossing.
Said step (4) comprises the steps:
(4-1) confirm the length of side of grid cell unit, make laterally with the length of side longitudinally and be d=1/2C
0* v;
(4-2) crossing, southwest corner with the virtual road network of whole public transport is a starting point, and eastwards, northwards seamless expansion grid cell unit is until being covered with the virtual road network of whole public transport, and each sub-district is numbered, and is Z for horizontal s 's, vertical t sub-district label
St, and same sub-district C
0 horizontal strokeOnly serve transverse line, C in signal period
0 is verticalOnly serve vertical line in signal period, the horizontal vertical cycle hockets, and alternately once is a total key signal cycle C
0
(4-3) according to the trend of every circuit, adjust bus running speed, the angle that defines m bar vertical line and direct north is α
M is vertical, n bar transverse line and due east direction angle be α
N is horizontal, so the travelling speed of every public bus network is adjusted into v
M is vertical=v
Vertical* sec α
M is vertical, v
N is horizontal=v
Horizontal* sec α
N is horizontal, make the transverse line bus just operates in horizontal signal period of sub-district, the vertical line bus just operates in the sub-district longitudinal signal in the cycle.
Said step (6) comprises the steps:
(6-1), confirm original departure interval Δ T ' according to conventional methods such as passenger flow characteristics, public transport vehicles for horizontal vertical every public bus network;
(6-2) the computes integer n that rounds up, n ≈ Δ T '/C
0, the definition departure interval is Δ T=n*C
0
(6-3) two signal phase scheme groups of definition: phase-group one, first laterally signal seeervice cycle, longitudinal signal cycle again, C
0=C
0 horizontal stroke+ C
0 is verticalPhase-group two, first longitudinal signal seeervice cycle, horizontal again signal seeervice cycle, C
0=C
0 is vertical+ C
0 horizontal strokeFor grid sub-district Z
St,, initially adopt phase-group one as s, when the t parity is identical; Otherwise, initially adopt phase-group two; The signal phase difference of all crossings is zero;
(6-4) coordinate to confirm the first last moment of each circuit according to passenger flow characteristics, signal phase scheme.
For the consideration that turns to traffic: there is the public bus network that turns to confirm as transverse line or vertical line according to its initial travel direction.No matter be to turn left or right-hand rotation, arrange vehicle according to the method described above, each car only possibly run into red light in first crossing after turning to; After crossing this crossing, still can keep green ripple to go.
Beneficial effect: the green ripple signal control method in public transit system provided by the invention zone; Compared with prior art have following advantage: 1, public bus network multi straight operation, the signal controlling of two phase place makes control efficiency significantly improve, traffic is simple and direct; Be convenient to scheduling; Working time is compact, has increased operational efficiency, has reduced cost; 2, public bus network can be enjoyed the space-time advantage fully, and arrival time, speed etc. can effectively ensure; 3, public transit vehicle reduces and to turn to, and has reduced conflicting between people and car when turning, car and the car, makes traffic order in good order, and people and vehicles are in harmony; 4, with respect to independent line traffic control pattern, its application extension has arrived the design of regional traffic signal, can realize the scheduling and the optimization of whole public transit system.
Description of drawings
Fig. 1 is the basic flow sheet of the signal coordinating technology of regional road network;
Fig. 2 is the actual figure of Local Area Network;
Fig. 3 is through the regional virtual road network figure after transforming;
Fig. 4 for virtual network graph through the junior unit synoptic diagram after the Region Segmentation;
Fig. 5 is the green ripple control graphic representation result of article one vertical line;
Fig. 6 is the green ripple control graphic representation result of article one transverse line.
Embodiment
Below in conjunction with accompanying drawing the present invention is done explanation further.
As shown in Figure 1; Basic flow sheet for the green ripple signal control method in public transit system zone; In the public transit system zone; Numerous public bus networks horizontal and that exercise have longitudinally intersected to form complicated line construction, so when the signal lamp parameter of each crossing of design, the public bus network that must satisfy on horizontal and vertical road all can pass through smoothly.The design of signal lamp parameter is primarily aimed at the horizontal vertical public bus network in the public transit system zone among the present invention.
A. the conventional timing of the classification of circuit and signal
The prerequisite of the green ripple signal controlling in public transit system zone is to confirm line alignment and calculate the independently normal signal timing of each crossing according to the volume of traffic, comprises these three important parameters of phase differential between signal period, green time and each crossing.Could foundation be provided for the further correction of signaling plan like this.
A. the classification of circuit
Circuit rationally being numbered, draw the angle of every circuit and direct north, is foundation with this angle, if at this angle in the north by west 45 ° then be defined as vertical line to the north by east in 45 ° the scope, otherwise, be transverse line.
B. the intersection signal cycle duration confirms
B1) according to the volume of traffic of each crossing, minimum as the index of weighing the traffic benefit the crossing total delay, adopt conventional Robert Webster (Webster) signal timing dial computing method in the traffic signals control, calculate the signal period length C of each crossing
Ij
B2) through comparing the signal period length C of each horizontal vertical crossing
Ij, the longest signalized intersections of required cycle as the key signal crossing in the zone, its cycle as unidirectional alternative key signal Cycle Length C '
0
B3) according to the public transit vehicle bus stop on-board and off-board mean delay time T of predicting
DelayAnd through the average duration T in crossing
PassJudge above cycle C '
0Whether satisfy the requirement in key signal cycle, promptly bus must be accomplished on-board and off-board and sail out of the crossing in the cycle.So if the alternative signal cycle is greater than T
DelayWith T
PassBoth sums, that just gets the unidirectional alternative key signal cycle is unidirectional key signal cycle, i.e. C
0 horizontal stroke=C
0 is vertical=C '
0Otherwise, then make C
0 horizontal stroke=C
0 is vertical=T
Pass+ T
Delay
B4) because signal controlling is divided into horizontal and vertical two different cycles of service of service, so total Cycle Length C of key signal mouth
0Should be horizontal and vertical cycle sum, i.e. C
0=C
0 is vertical+ C
0 horizontal stroke
B5) with C
0Total duration of signal period as the regional unified signalized intersections of whole public transport.
C. crossing public bus network direction street lamp length confirms
C1), calculate the ratio of each phase place key flow amount of each crossing, and calculate split with Robert Webster signal timing dial computing method.
C2) according to unidirectional key signal Cycle Length C
0 horizontal strokeCycle Length C with each signalized intersections
IjConfirm the increment in each intersection signal cycle, under the condition of the shortest green light duration of each phase place that satisfies each crossing, the green time to the public bus network direction prolongs as far as possible.And maximum green light duration can be by the a4 among the step B) obtain.
C3) because route is horizontal vertical intersection, the green time of another direction is according to C
0 is verticalAnd C
IjCalculate as stated above.
C4) above-mentioned horizontal vertical timing is superposeed, form complete cycle C
0, then conventional timing is accomplished basically.
B. the division of the structure of virtual road network and control area and speed of a motor vehicle adjustment
In order to let vehicle that transverse and longitudinal goes in the control sub-district, operate in the control cycle of direction separately, must divide whole public transport zone, and the speed of a motor vehicle of the last vehicle of some road is rationally adjusted.
A. accomplish virtual network graph
To signal controlling the time, often the conversion through space-time is converted into virtual road network with the road of reality, thereby makes things convenient for the division of control zone, also is beneficial to when considering that vehicle is discontinuous and go to adopt improved algebraic method to carry out the modification of normal signal.
A1) the travelling speed v of preset horizontal ordinate road bus
Horizontal=v
Vertical=v=30km/h.
A2) idea of utilization space-time conversion is according to public transit vehicle bus stop on-board and off-board mean delay time T
DelayWith through the average duration T in crossing
PassBe converted into unit length L to the discontinuous time of going of vehicle
Delay=T
Delay* v, L
Pass=T
Pass* v.
A3) with L
DelayAnd L
PassAdd original road correspondence position to as the length of virtual segment, obtain virtual road network.
A4), confirm that every green light on the public bus network between the last crossing of road starts the maximum green time length on the time difference and the public bus network according to virtual road network and algebraic method.
B. grid divides the district
B1) preset grid control sub-district be a square, and it laterally is total Cycle Length and preset vehicle speed with length longitudinally half of product promptly is expressed as d=1/2C
0* v.
B2) southwest corner of dividing overall area is certainly counted, and the adjacent spacing of northwards drawing eastwards respectively is the parallel lines of d, and whole like this zone just is divided into several needed squares.Cut apart the end back it is numbered, bottom-up from left to right, subscript increases successively.Can write shaping like Z like certain regional code name
StForm, it represents horizontal s, vertical t zone.
B3) because the trend of every circuit is not strict along positive north or the due east direction, all exist certain included angle.So in order to guarantee to reach the design speed per hour, must draw the angle (angle of vertical line and direct north) of transverse line and due east direction, get final product divided by this angle cosine with the design speed per hour at the vehicle of positive north or due east direction.Like v
M is vertical=v
Vertical* sec α
M is vertical justThe speed of a motor vehicle has longitudinally been carried out reasonable adjustment.
C. algebraic method is carried out the signal adjustment
A. circuit is carried out initialization, be the basis, confirm the distance between the first last starting station, crossing, the virtual crossing, and it is just the same to configure the signal controlling parameter of crossing corresponding with it, virtual crossing with the virtual public transport road network of above-mentioned gained.
B. earlier each bar vertical line is carried out algebraic method timing adjustment, draw vertical periodic signal parameter of each crossing.Calculate S=1/2v*C earlier
0 is vertical, and s got a suitable mobility scale, write a row in the algebraic method form successively, calculate each row of a row, find out itself and the offsetting distance of ideal signal position, calculate the poor of the adjacent amount of moving again, maximal value is inserted b be listed as.Find out the maximal value of b, confirm the ideal signal position, calculate green time loss, ask the time difference again, confirm the coordination mode between each signal.At last, get final product according to asking the cycle that the design speed per hour of road is suitably adjusted.
C. similar for the adjustment of the algebraic method timing adjustment of transverse line and vertical line.
D. regional signal phase-group
The grid of addressing according to the front divides the district, formulates two kinds of signal phase prescription cases.For regional Z
St,, i.e. horizontal cycle of service earlier, serve vertical cycle again if (s+t) %2=0 then should initially use phase-group one in the zone; If (s+t) %2=1 then should initially use phase-group two in the zone, promptly serve vertical cycle earlier, serve the horizontal cycle again.
E. departure interval and the first last bus moment confirms
A series of intersection signal control also will coordinate to accomplish the overall control in public transport zone with the moment control of public transit system.
A. the departure interval confirms
A1) according to the concrete condition of road conditions and flow of passengers, confirm initial departure interval Δ T ' through conventional method for the horizontal ordinate of each bar road.With its correction data as preparation.
A2) algorithm of employing backstepping is proofreaied and correct.Calculate Δ T '/C
0,, obtain an Integer n with the mathematical operations that the gained result rounds up.
A3) adopt the n of above-mentioned steps gained to carry out backstepping, obtain formal departure interval Δ T=n*C
0
B. the definite of first last time dispatches a car
Confirm the frequency on the single line earlier
B1) judge between the first starting station of public transport and the adjacent crossing whether have bus stop, if exist then with on the virtual road network figure, the starting station is S to the distance of virtual crossing, otherwise is S with the actual range.
B2) bright offset value delta=S/V is played to the green light of adjacent crossing in the calculating starting station.
B3) green light according to adjacent crossing plays bright time T
0, calculate the frequency T of first regular bus
Ij=T
0-Δ and with this as horizontal i bar, the reference time that public transport is dispatched a car on vertical j bar road.
B4) when the benchmark that draws every public bus network after the time of departure, finely tune, make each bar laterally differ C the reference time of dispatching a car of (vertically) circuit
0Integral multiple.
Example:
Shown in accompanying drawing 2, the public bus network net in somewhere, each bar public bus network all go on the public transportation lane of road separately.At first the road with this area is reduced to the road net structure that four horizontal strokes four are indulged, and vertically the first starting station of road is denoted as A respectively, B, and C, D, the last starting station is denoted as a respectively; B, c, d, the first starting station of belt road is denoted as I, II, III respectively; IV, the last starting station is respectively 1,2, and 3,4.Each route shows on figure respectively with the angle of positive north or due east direction.The crossing is respectively: C
11, C
12, C
13, C
14, C
21, C
22, C
23, C
24, C
31, C
32, C
33, C
34, C
41, C
42, C
43, C
44
In this signal controlling, at first gone out the signal timing dial parameter of the routine of each crossing through the Robert Webster Model Calculation, can be expressed as as shown in table 1 through arrangement:
The normal signal timing parameter of each crossing of table 1
Through the comparison in each intersection signal cycle, can be temporarily with 80s as the unidirectional alternative signal cycle, with the mean delay T of it and passenger getting on/off
Delay(getting 42s) and bus averaging time (getting 15s) through the crossing with compare, be 80s thereby draw the one way signal cycle.Because the horizontal vertical intersection of road, signal are divided into the horizontal and vertical different cycles of service, so draw total cycle C of signal
0=160s.
Secondly, the component of travel speed on positive north or due east direction of the public transit vehicle on preset every circuit is 30km/h.In the represented road network of example, B-b circuit and II-2 circuit are not strict with due east and direct north, and their speed must be through overcorrect, and the angle of two circuits and prescribed direction is 10 °, their speed v '=v*sec α=30.5km/h.Suppose that all there is bus stop each crossing, we transform into distance of equal value to the time of incuring loss through delay, and are reflected to the relevant position on the figure, have drawn the result shown in accompanying drawing 3.
Then, by crossing C
11Rise, northwards expand eastwards respectively, with length of side d=1/2C
0* v=667m marks off several traffic zone junior units, and each junior unit number consecutively becomes Z
11, Z
12, Z
13, Z
21, Z
22, Z
23, Z
31, Z
32, Z
33Shown in accompanying drawing 4.
Then, signal period and each signal duration of each crossing are unified, because the horizontal cycle of each crossing service and vertical cycle are distinguished to some extent, so separately adjustment, the adjustment result is shown in table 2 and table 3:
Table 2 is each intersection signal timing table during the cycle laterally
Table 3 is each intersection signal timing table during the cycle vertically
Then, according to the division of sub-district, unit, phase place scheme one is adopted in the identical zone of subscript parity, and the timing scheme of promptly taking to serve the horizontal cycle earlier takes to serve the timing scheme in vertical cycle again; Otherwise phase place scheme two is adopted in the different zone of subscript parity, and the timing scheme of promptly taking to serve vertical cycle earlier takes to serve the timing scheme in horizontal cycle again.
Take algebraic method to find the solution the signal coordinating controlling schemes under the pattern below.Shown in accompanying drawing 3, calculation and thinking is following:
(because calculated amount is comparatively huge, this example is only to crossing C
11Calculate, control signal then can be coordinated through similar calculating in all the other crossings)
Calculate vertical road A-a earlier; Through the calculating of algebraic method form, we can draw the position of each crossing ideal signal, and calculate green time loss and effective split through the amount of moving of actual signal and ideal signal; Calculate the green time difference at last, its result of calculation is as shown in table 4:
Each intersection signal parameter of table 4 road A-a
In like manner, the result of road I-1 is as shown in table 5:
Each intersection signal parameter of table 5 road I-1
The timing scheme that result of calculation obtains can be expressed as accompanying drawing 5 and accompanying drawing 6.
Through above calculating and correction, the traffic signals timing is accomplished basically, and the service scenario of junior unit is also clear, like regional Z
11, be that a length of side is the little square of 667m, comprised four crossing C
11, C
12, C
21, C
22The signal period of these crossings is 160s, and the first half service is horizontal, and half serves the back vertically, and specifically the signal duration of each phase place can be calculated by above.Sub-district Z
21The length of side is 667m also, comprises crossing C
31, C
32Different with the former is, and they are then served earlier vertically and are serving laterally.
At last, play the coordination controlled variable that mutual relationship between the bright moment just can be confirmed signal lamp according to the public bus network direction green light of having grasped, and confirm the time of departure thus, the departure interval is then according to transport need, the number of winning the confidence cycle C
0Integral multiple get final product, can specify departure time-table as shown in table 6 at present, the departure interval is got a signal period:
Table 6 bus departure time-table
The above only is a preferred implementation of the present invention; Be noted that for those skilled in the art; Under the prerequisite that does not break away from the principle of the invention, can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (5)
1. the green ripple signal control method in public transit system zone, it is characterized in that: this method comprises the steps:
(1) confirms the public bus network classification indicators, planning zone is contained all roads that public transport passes through according to trend, be divided into two types of transverse line and vertical lines; The normal signal timing is independently carried out according to the magnitude of traffic flow in all crossings, and signal period length is C
Ij, C wherein
IjRepresent horizontal i, the individual intersection signal Cycle Length of vertical j;
(2) according to the signal period length C of each crossing
Ij, public transit vehicle bus stop on-board and off-board mean delay time T
DelayWith through the average duration T in crossing
Pass, confirm horizontal ordinate road key signal Cycle Length C
0 horizontal stroke=C
0 is vertical, and with total key signal Cycle Length C
0=C
0 horizontal stroke+ C
0 is verticalSignal period length as each crossing;
(3) the travelling speed v of preset horizontal ordinate road bus
Horizontal=v
Vertical=v=30km/h is with public transit vehicle bus stop on-board and off-board mean delay time T
DelayWith through the average duration T in crossing
PassConvert unit length L into
Delay=T
Delay* v, L
Pass=T
Pass* v adds original road correspondence position to as virtual segment, obtains virtual road network;
(4) divide grid sub-district, horizontal ordinate road jointly according to the travelling speed and the signal period length of preset horizontal ordinate road bus, and same sub-district C
0 horizontal strokeOnly serve transverse line, C in signal period
0 is verticalOnly serve vertical line in signal period, the horizontal vertical cycle hockets, and alternately once is a total key signal cycle C
0Adjust the travelling speed v of horizontal ordinate road bus
Horizontal, v
Vertical, make the transverse line bus just operates in horizontal signal period of sub-district, the vertical line bus just operates in the sub-district longitudinal signal in the cycle;
(5) adopt algebraic method that the normal signal timing scheme of every public bus network is adjusted, to satisfy the green ripple requirement of public transport mongline bidirectional;
(6) require the comprehensive bus departure interval of confirming according to signal period length, bus passenger flow; Confirm bus departure interval and first last frequency according to the signaling plan of grid sub-district, horizontal ordinate road.
2. the green ripple signal control method in public transit system according to claim 1 zone, it is characterized in that: said step (1) comprises the steps:
(1-1) confirm the public bus network classification indicators: at first all public bus networks are numbered; Confirm circuit start the trend with the direct north corner dimension; Is vertical line with 45 ° of norths by west to all circuits in the 45 ° of scopes in north by east, and all the other direction circuits are transverse line;
(1-2) confirm the normal signal timing: according to each crossing magnitude of traffic flow, adopt Robert Webster signal timing dial computing method, successively confirm the signal period C of each crossing
Ij, each crossing out of phase key flow flow rate ratio
The split of each phase place of crossing
And the shortest green light duration
Wherein,
The volume of traffic of representing l phase place key flow of the crossing that horizontal i is individual, vertical j is individual,
L phase place split representing the crossing that horizontal i is individual, vertical j is individual,
L phase place green light duration representing the crossing that horizontal i is individual, vertical j is individual.
3. the green ripple signal control method in public transit system according to claim 1 zone, it is characterized in that: said step (2) comprises the steps:
(2-1) more horizontal ordinate road intersection signal Cycle Length C
Ij, confirm that the longest crossing of signal period is crucial crossing, its signal period length is unidirectional alternative key signal Cycle Length C '
0=maxC
Ij
(2-2) according to unidirectional alternative key signal Cycle Length, public transit vehicle bus stop on-board and off-board mean delay time T
Delay, through the average duration T in crossing
Pass, calculate unidirectional key signal Cycle Length C
0 horizontal stroke=C
0 is vertical=max (C '
0, T
Pass+ T
Delay);
(2-3) with total key signal Cycle Length C
0=C
0 horizontal stroke+ C
0 is verticalSignal period length as each crossing.
4. the green ripple signal control method in public transit system according to claim 1 zone, it is characterized in that: said step (4) comprises the steps:
(4-1) confirm the length of side of grid cell unit, make laterally with the length of side longitudinally and be d=1/2C
0* v;
(4-2) crossing, southwest corner with the virtual road network of whole public transport is a starting point, and eastwards, northwards seamless expansion grid cell unit is until being covered with the virtual road network of whole public transport, and each sub-district is numbered, and is Z for horizontal s 's, vertical t sub-district label
St, and same sub-district C
0 horizontal strokeOnly serve transverse line, C in signal period
0 is verticalOnly serve vertical line in signal period, the horizontal vertical cycle hockets, and alternately once is a total key signal cycle C
0
(4-3) according to the trend of every circuit, adjust bus running speed, the angle that defines m bar vertical line and direct north is α
M is vertical, n bar transverse line and due east direction angle be α
N is horizontal, the travelling speed of m bar vertical line and n bar transverse line is adjusted into v respectively so
M is vertical=v
Vertical* sec α
M is vertical, v
N is horizontal=v
Horizontal* sec α
N is horizontal, make the transverse line bus just operates in horizontal signal period of sub-district, the vertical line bus just operates in the sub-district longitudinal signal in the cycle.
5. the green ripple signal control method in public transit system according to claim 4 zone, it is characterized in that: said step (6) comprises the steps:
(6-1), confirm original departure interval Δ T ' according to conventional methods such as passenger flow characteristics, public transport vehicles for horizontal vertical every public bus network;
(6-2) the computes integer n that rounds up, n ≈ Δ T '/C
0, the definition departure interval is Δ T=n*C
0
(6-3) two signal phase scheme groups of definition: phase-group one, first laterally signal seeervice cycle, longitudinal signal cycle again, C
0=C
0 horizontal stroke+ C
0 is verticalPhase-group two, first longitudinal signal seeervice cycle, horizontal again signal seeervice cycle, C
0=C
0 is vertical+ C
0 horizontal strokeFor grid sub-district Z
St,, initially adopt phase-group one as s, when the t parity is identical; Otherwise, initially adopt phase-group two; The signal phase difference of all crossings is zero;
(6-4) coordinate to confirm the first last moment of each circuit according to passenger flow characteristics, signal phase scheme.
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