CN111341122A - Self-adaptive algorithm for controlling time length of intersection signal lamp - Google Patents
Self-adaptive algorithm for controlling time length of intersection signal lamp Download PDFInfo
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Abstract
The invention discloses an adaptive algorithm for controlling and adjusting the time length of a signal lamp at an intersection, and belongs to the field of traffic light control. Under the fixed time length control mode of the signal lamp of the intersection, the total control time length of each direction of the intersection or the control time length of the straight going and the left turning in the same direction are intelligently adjusted through a self-adaptive algorithm according to the passing efficiency value data provided by the statistical table of the database of the intersection. The algorithm mainly relates to the judgment of absolute values of the difference of efficiency values in different directions, and the control of the passing time length is adjusted within a certain ratio difference; the same is true for the control duration adjustment for straight and left turns in the same direction. The algorithm can intelligently adjust the time length control of the intersection signal lamp, reduce the waiting time, improve the passing efficiency and reduce the emission and idle oil consumption.
Description
Technical Field
The invention relates to an adaptive algorithm for controlling the time length of an intersection signal lamp, belonging to the field of intelligent control of the intersection signal lamp
Background
At present, the control mode of urban intersection signal lamps is based on a fixed time length control mode (hereinafter referred to as a fixed mode), and the urban intersection signal lamp control method is characterized in that no matter vehicles are on roads in all directions of an intersection or no vehicles are on the roads, the signal lamps are controlled according to set time length to indicate whether the vehicles pass or not.
Such a control in the fixed mode should be said to be effective at an intersection where vehicles are crowded (a downtown or a busy section or a rush hour). But at intersections where vehicles are rare (new areas built in cities or non-busy road sections or off-peak traffic), this control method is effective but not efficient.
There may be situations at intersections where vehicles are scarce or off-peak: the green light in the east-west direction has no vehicle to pass, but the red light in the north-south direction has vehicles to wait for a period to pass, so that unnecessary waiting in the north-south direction is caused, and the passing efficiency is reduced, the idling oil consumption of the automobile is increased, and redundant pollution emission is caused.
Therefore, the method has practical significance for improving the existing fixed mode of the intersection signal lamp to improve the traffic efficiency of the intersection.
The vehicle passing in each direction of the intersection before the fixed mode is commanded and controlled by people, and the method is characterized in that the subjective activity of people can be fully exerted, and the vehicle passing or waiting can be flexibly commanded according to the condition that vehicles exist or do not exist on the road in each direction of the intersection, and the method is represented as follows:
(1) when the traffic flow of the road is small, people can pass one side of the road once the other side of the road is empty according to the road condition, unnecessary waiting is reduced, and effectiveness and high efficiency are achieved.
(2) When the traffic flow of the road is large, the passing time of vehicles on the road in each direction at the intersection is difficult to be balanced by artificially directing the traffic, so that the unreasonable passing time in each direction is caused.
(3) People command traffic, need observe the intersection traffic flow condition constantly, but people's energy is limited, and the concentration of long-time energy can let the people excessively tired, and working strength increases, and every intersection all needs someone to come the command moreover, causes the human cost height.
Therefore, from the end of the 70 s to the beginning of the 80 s, a fixed mode control method of the intersection signal lamp has appeared and is used up to now. The mode effectively manages the passing sequence of the intersection, solves the problems (2) and (3), ensures the balance of the total passing time of all directions of the intersection and reduces the cost of people. But has remarkable inflexibility, and whether vehicles exist in the other direction or not is not required to wait for a period, so that the efficiency is quite low.
Disclosure of Invention
The invention aims to solve the technical problem of providing an adaptive algorithm for adjusting the control time length of an intersection signal lamp based on the judgment of the traffic efficiency value, wherein the algorithm is used for calculating and intelligently adjusting the control time length of each direction or the straight and left turn of the intersection in the same direction according to the traffic efficiency value of the intersection stored in a database daily statistical table, so that the purpose of balancing the traffic of the intersection is realized, and the traffic efficiency is improved.
The technical scheme adopted by the invention is as follows: an adaptive algorithm for controlling the time length of an intersection signal lamp comprises the following steps:
firstly, readjusting the time lengths in the east-west direction and the south-north direction under the condition of ensuring that the sum of the time lengths in the east-west direction and the south-north direction of the intersection is not changed, wherein the readjusting comprises the following two conditions:
(1) if the absolute value of the efficiency difference value in the two directions is less than d%, the adjustment is not carried out, and the step two is directly carried out;
(2) if the absolute value of the efficiency difference value in the two directions is greater than or equal to d%, adjusting that the time length of the party with higher traffic efficiency value is reduced, and the time length of the party with lower traffic efficiency value is increased; secondly, on the basis that the fixed time length of the intersection in the east-west direction and the south-north direction is adjusted, the straight-going fixed time length in the same direction and the fixed time length of the left turn are redistributed according to the original distribution proportion of the straight-going fixed time length in the same direction and the left turn at the time interval of m time intervals of the previous adjusted time length, and then the step two is carried out;
step two: readjustment of fixed time length for calculating straight-going left-turn in same direction of intersection
Firstly, calculating the straight-going and left-turning passing efficiency values of the intersection in the same direction within a time interval m of an adjustment duration, and then adjusting the efficiency values according to the following two conditions:
(1) if the absolute value of the difference value of the efficiencies of straight going and left turning at the intersection in the same direction is less than d percent, the adjustment is not carried out;
(2) and if the absolute value of the difference value of the efficiencies of straight going and left turning at the intersection in the same direction is more than or equal to d%, adjusting that the time length of the party with higher traffic efficiency value is reduced, and the time length of the party with lower traffic efficiency value is increased.
The method specifically comprises the following steps:
step1, adjusting the fixed time length of the crossing in the east-west direction and the south-north direction;
step1.1: calculating the efficiency values of the passing efficiency of the crossing in the east-west direction and the south-north direction in the time interval of m of the last adjustment time length:
the intersection data acquisition method comprises the following steps of obtaining a time interval intersection data base record table, wherein n in the formula is the record number of an intersection data base record table of an m time period, i is a count, η _ n and η _ e are respectively the counted passing efficiency values of the north and south directions and the east and west directions in the previous time interval m time period, Tn and Te are respectively fixed time periods distributed in the north and south directions and the east and west directions in the previous time interval m time period, and Tn and Te are respectively the actual passing time periods of the north and south directions and the east and west directions in the previous time interval m time period;
step1.2: calculating the fixed time length of the east-west, south-north readjustment of the intersection
Step1.2.1 if the absolute value of η _ n- η _ e < d%, the fixed time lengths of east, west and south of the intersection are not adjusted, at the moment, the fixed time lengths of straight going and left turning in the east, south and north directions are not changed, Tns _ old comprises the fixed time length of straight going in m time intervals in the south and north directions, Tnl _ old comprises the fixed time length of left turning in m time intervals in the south and north directions, Tes _ old comprises the fixed time length of straight going in m time intervals in the east and west directions, and Tel _ old comprises the fixed time length of left turning in m time intervals in the east and west directions, and then Step2 is directly carried out;
step1.2.2 if | η _ n- η _ e | >, d%, then the following steps are performed, and then Step2 is entered:
step1.2.2.1 i) Heo η_n>η_eThen, then
At this time:
Tn_new＝Tn_old-ΔTa
Te_new＝Te_old+ΔTa
in the formula:
d%: comparing the difference of the efficiency values with a reference value, wherein the value of the difference is 10% of the total control time length in the north-south direction and the east-west direction;
Δ Ta: time for readjusting east-west, south-north of intersection
Tn _ old: fixed duration of m time periods in north-south direction
Tn _ new: fixed duration of north-south readjustment
Te _ old: fixed duration of m time periods in east-west direction
Te _ new: fixed duration of east-west readjustment
Ii) if η _ e>η _ n, then
At this time:
Tn_new＝Tn_old+ΔTa
Te_new＝Te_old-ΔTa；
after the duration in each direction is adjusted by Step1.2.2.2, the duration of the straight-going and left-turning in the same direction is redistributed and calculated according to the original distribution proportion in the previous m time period:
the north-south direction:
Rn＝Tns_old/(Tns_old+Tnl_old)
Tns_new＝Tn_new*Rn
Tnl_new＝Tn_new-Tns_new
in the formula:
rn: distribution ratio of one-cycle straight-going and left-turning time length in north-south direction
Tns _ old: fixed time length for straight going of m time intervals in north-south direction
Tnl _ old: left turn fixed time length of m time periods in north-south direction
Tns _ new: fixed duration of north-south straight-line redistribution
Tnl _ new: fixed duration of left turn left reassigned north and south
The east-west direction:
Re＝Tes_old/(Tes_old+Tel_old)
Tes_new＝Te_new*Re
Tel_new＝Te_new-Tes_new
in the formula:
re: distribution ratio of one-cycle straight-going and left-turning time length in east-west direction
Tes _ old: fixed time length for straight going of m time intervals in east-west direction
Tel _ old: left-turning fixed duration of m time periods in east-west direction
Tes _ new: fixed duration of east-west straightforward reallocation
Tel _ new: fixed duration of east-west left turn reassignment
Step 2: calculating the fixed time length of readjustment of straight running and left turning in the same direction:
step2.1, calculating the efficiency values of straight-going and left-turning passing of the intersection within m minutes of the last adjustment time interval:
n in the formula is the record number of an intersection database record table of the m time periods, i is a counting number, η _ s and η _ l are respectively the traffic efficiency values improved by straight running and left turning in all directions counted by an adjustment time period interval m time period in the same direction, Ts and Tl are respectively fixed time periods distributed by straight running and left turning of the adjustment time period interval m time period in the same direction, and Ts and Tl are respectively the actual traffic time periods distributed by straight running and left turning of the adjustment time period interval m time period in the same direction;
step2.2 calculating the readjusted fixed time length of straight going and left turning at the intersection
If the absolute value of η _ s- η _ l is less than d%, the fixed time length of straight going and left turning at the intersection is not adjusted;
if the | η _ s- η _ l | > < d%
I) if η _ s>η_l，
When the given time for the straight and left turn directions is
Ts_new＝Ts_old-ΔTs
Tl_new＝Tl_old+ΔTs
In the formula:
Δ Ts: readjusting time for straight left turn at intersection in same direction
Ts _ old: go straight in the same direction for a fixed duration based on Step2
Ts _ new: fixed length of straight line readjusted in the same direction at intersection
Tl _ old: left turn in the same direction for a fixed duration upon entering Step2
Tl _ new: fixed time length of left turn readjusted in same direction at intersection
Ii) if η _ l>η_s，
The given time for the straight and left turn is
Ts_new＝Ts_old+ΔTs
Tl_new＝Tl_old-ΔTs
In the formula:
Δ Ts: readjusting time for straight left turn at intersection in same direction
Ts _ old: go straight in the same direction for a fixed duration based on Step2
Ts _ new: fixed length of straight line readjusted in the same direction at intersection
Tl _ old: left turn in the same direction for a fixed duration upon entering Step2
Tl _ new: fixed time length of left turn readjusted in same direction at intersection
Step 3: step1 and Step2 are repeatedly executed in sequence at the adjusted time interval m time period.
The time interval m of the adaptive adjustment is 30min, and d% is 10%.
The Tn, Te, Tn, Te, Ts, Tl, Ts and Tl are respectively stored in each record of the intersection database record table in real time, and η _ n, η _ e, η _ s and η _ l can be directly used for value taking from the day statistical table of the intersection database.
The invention has the beneficial effects that: according to the invention, under the existing fixed time length control framework of the intersection signal lamp, the control time lengths in the north-south direction and the east-west direction are firstly adjusted according to the passing efficiency value in the time period of m, and then the control time lengths for straight going and left turning in the same direction are adjusted, so that the purpose of more reasonable distribution of the control time lengths is achieved, and the passing efficiency of the intersection is improved.
Drawings
FIG. 1 is a flow chart of the present invention for adjusting the fixed duration of the intersection east-west, north-south and the straight-going and left-turning reassigned durations in the same direction;
FIG. 2 is a flow chart of the present invention for readjusting the fixed duration for straight and left turns in the same direction.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Example 1: as shown in fig. 1 and 2, an adaptive algorithm for controlling the time length of an intersection signal lamp includes the following steps:
firstly, readjusting the time lengths in the east-west direction and the south-north direction under the condition of ensuring that the sum of the time lengths in the east-west direction and the south-north direction of the intersection is not changed, wherein the readjusting comprises the following two conditions:
(1) if the absolute value of the efficiency difference value in the two directions is less than d%, the adjustment is not carried out, and the step two is directly carried out;
(2) if the absolute value of the efficiency difference value in the two directions is greater than or equal to d%, adjusting that the time length of the party with higher traffic efficiency value is reduced, and the time length of the party with lower traffic efficiency value is increased; secondly, on the basis that the fixed time length of the intersection in the east-west direction and the south-north direction is adjusted, the straight-going fixed time length in the same direction and the fixed time length of the left turn are redistributed according to the original distribution proportion of the straight-going fixed time length in the same direction and the left turn at the time interval of m time intervals of the previous adjusted time length, and then the step two is carried out;
step two: readjustment of fixed time length for calculating straight-going left-turn in same direction of intersection
Firstly, calculating the straight-going and left-turning passing efficiency values of the intersection in the same direction within a time interval m of an adjustment duration, and then adjusting the efficiency values according to the following two conditions:
(1) if the absolute value of the difference value of the efficiencies of straight going and left turning at the intersection in the same direction is less than d percent, the adjustment is not carried out;
(2) and if the absolute value of the difference value of the efficiencies of straight going and left turning at the intersection in the same direction is more than or equal to d%, adjusting that the time length of the party with higher traffic efficiency value is reduced, and the time length of the party with lower traffic efficiency value is increased.
Further, the method specifically comprises the following steps:
step1, adjusting the fixed time length of the crossing in the east-west direction and the south-north direction;
step1.1: calculating the efficiency values of the passing efficiency of the crossing in the east-west direction and the south-north direction in the time interval of m of the last adjustment time length:
n in the formula is the record number of the intersection database record table of the time period m, i is the count number, η _ n and η _ e are respectively the statistical passing efficiency values of the north and south and the east and the west in the time period m of the last adjustment time interval;
tn, Te, Tn and Te are respectively stored in each record of an intersection database record table in real time, and η _ n and η _ e can be directly valued from a daily statistical table of an intersection database for use;
step1.2: calculating the fixed time length of the east-west, south-north readjustment of the intersection
Step1.2.1 if the absolute value of η _ n- η _ e < d%, the fixed time lengths of east, west and south of the intersection are not adjusted, at the moment, the fixed time lengths of straight going and left turning in the east, south and north directions are not changed, Tns _ old comprises the fixed time length of straight going in m time intervals in the south and north directions, Tnl _ old comprises the fixed time length of left turning in m time intervals in the south and north directions, Tes _ old comprises the fixed time length of straight going in m time intervals in the east and west directions, and Tel _ old comprises the fixed time length of left turning in m time intervals in the east and west directions, and then Step2 is directly carried out;
step1.2.2 if | η _ n- η _ e | >, d%, then the following steps are performed, and then Step2 is entered:
step1.2.2.1 i) Heo η_n>η_eThen, then
At this time:
Tn_new＝Tn_old-ΔTa
Te_new＝Te_old+ΔTa
in the formula:
d%: comparing the difference of the efficiency values with a reference value, wherein the value of the difference is 10% of the total control time length in the north-south direction and the east-west direction;
Δ Ta: time for readjusting east-west, south-north of intersection
Tn _ old: fixed duration of m time periods in north-south direction
Tn _ new: fixed duration of north-south readjustment
Te _ old: fixed duration of m time periods in east-west direction
Te _ new: fixed duration of east-west readjustment
Ii) if η _ e>η _ n, then
At this time:
Tn_new＝Tn_old+ΔTa
Te_new＝Te_old-ΔTa；
after the duration in each direction is adjusted by Step1.2.2.2, the duration of the straight-going and left-turning in the same direction is redistributed and calculated according to the original distribution proportion in the previous m time period:
the north-south direction:
Rn＝Tns_old/(Tns_old+Tnl_old)
Tns_new＝Tn_new*Rn
Tnl_new＝Tn_new-Tns_new
in the formula:
rn: distribution ratio of one-cycle straight-going and left-turning time length in north-south direction
Tns _ old: fixed time length for straight going of m time intervals in north-south direction
Tnl _ old: left turn fixed time length of m time periods in north-south direction
Tns _ new: fixed duration of north-south straight-line redistribution
Tnl _ new: fixed duration of left turn left reassigned north and south
The east-west direction:
Re＝Tes_old/(Tes_old+Tel_old)
Tes_new＝Te_new*Re
Tel_new＝Te_new-Tes_new
in the formula:
re: distribution ratio of one-cycle straight-going and left-turning time length in east-west direction
Tes _ old: fixed time length for straight going of m time intervals in east-west direction
Tel _ old: left-turning fixed duration of m time periods in east-west direction
Tes _ new: fixed duration of east-west straightforward reallocation
Tel _ new: fixed duration of east-west left turn reassignment
Step 2: calculating the fixed time length of readjustment of the straight movement and the left turning in the same direction (because the east-west direction, the south-north direction and the left turning are adjusted in the same method, the east-west direction, the south-north direction and the left turning are not distinguished any more, and the following methods are uniformly applied to the east-west direction, the south-north direction and the left turning):
step2.1, calculating the efficiency values of straight-going and left-turning passing of the intersection within m minutes of the last adjustment time interval:
n in the formula is the record number of an intersection database record table at an interval of m time periods of an adjusted time length in the same direction, i is a counting number, η _ s and η _ l are respectively the traffic efficiency values improved by straight running and left turning in each direction counted at an interval of m time periods of an adjusted time length in the same direction, Ts and Tl are respectively fixed time lengths distributed by straight running and left turning at an interval of m time periods of an adjusted time length in the same direction, Ts and Tl are respectively the actual traffic time lengths of straight running and left turning at an interval of m time periods of an adjusted time length in the same direction, Ts, Tl, Ts and Tl are respectively stored in each record of the intersection database record table in real time, and η _ s and η _ l related to the method are directly used for taking values from a day statistic table of an intersection database;
step2.2 calculating the readjusted fixed time length of straight going and left turning at the intersection
If the absolute value of η _ s- η _ l is less than d%, the fixed time length of straight going and left turning at the intersection is not adjusted;
if the | η _ s- η _ l | > < d%
I) if η _ s>η_l，
When the given time for the straight and left turn directions is
Ts_new＝Ts_old-ΔTs
Tl_new＝Tl_old+ΔTs
In the formula:
Δ Ts: readjusting time for straight left turn at intersection in same direction
Ts _ old: go straight in the same direction for a fixed duration upon going to Step2, namely: if the Step2 is directly entered from Step1.2.1, Ts _ old is Tns _ old or Tes _ old; if entering Step2 from Step1.2.2, Ts _ old is Tns _ new or Tes _ new;
ts _ new: fixed length of straight line readjusted in the same direction at intersection
Tl _ old: the same direction left turn according to Step2 is for a fixed duration, namely: if the user directly enters Step2 from Step1.2.1, then Tl _ old is Tnl _ old or Tel _ old; if entering Step2 from Step1.2.2, Tl _ old is Tnl _ new or Tel _ new;
tl _ new: fixed time length of left turn readjusted in same direction at intersection
Ii) if η _ l>η_s，
The given time for the straight and left turn is
Ts_new＝Ts_old+ΔTs
Tl_new＝Tl_old-ΔTs
In the formula:
Δ Ts: readjusting time for straight left turn at intersection in same direction
Ts _ old: go straight in the same direction for a fixed duration upon going to Step2, namely: if the Step2 is directly entered from Step1.2.1, Ts _ old is Tns _ old or Tes _ old; if entering Step2 from Step1.2.2, Ts _ old is Tns _ new or Tes _ new;
ts _ new: fixed length of straight line readjusted in the same direction at intersection
Tl _ old: the same direction left turn according to Step2 is for a fixed duration, namely: if the user directly enters Step2 from Step1.2.1, then Tl _ old is Tnl _ old or Tel _ old; if entering Step2 from Step1.2.2, Tl _ old is Tnl _ new or Tel _ new;
tl _ new: fixed time length of left turn readjusted in same direction at intersection
Step 3: step1 and Step2 are repeatedly executed in sequence at the adjusted time interval m time period.
Further, the adaptively adjusted time interval m is 30min, and d% is 10%.
Example 2, setting the north-south and east-west directions of the intersection, setting the current fixed time length Tn to 60 and Te to 60s, setting the straight-going time Ts to 40s (south-north and east-west) and left-turn time Tl to 20s for one adjusting time length interval m time period in each direction, setting all the following passing efficiency values to be counted in 30 minutes, setting the efficiency comparison value d% to 10%, η _ n to 40%, η _ e to 35%, the north-south directions to η _ s to 40%, η _ l to 36%, the east-west directions to η _ s to 45% and η _ l to 40%, and setting the south-north direction to η _ s to 40%, η _ l to 36%, and the east-west direction to η _ s to 40%, wherein
The general formula I is I η _ n- η _ e | < 10%, the south-north direction is | η _ s- η _ l | < 10%, and the east-west direction is | η _ s- η _ l | < 10%
Therefore, the fixed duration in all directions is not adjusted
Wherein:
η _ n passing efficiency value in north and south direction counted in the last period of time of adjustment interval m
η _ e passing efficiency value of east-west direction counted in last period of adjusted duration interval m
η _ s efficiency rate of straight-going traffic counted during the last adjusted interval m
η _ l traffic efficiency value for the left turn counted during the last adjusted time interval m period
Example 3, setting the north-south direction and the east-west direction of the intersection, setting the current fixed time length Tn to 60 and Te to 60s, setting the straight-going time Ts to Ts _ old to 40s in one adjusting time interval m period in each direction, namely, the left-turning time Tl to Tl _ old to 20s, setting all the following passing efficiency values to be counted in 30 minutes, setting the efficiency difference comparison value d% to 10%, η _ n to 40%, η _ e to 35%, setting the north-south direction η _ s to 33%, η _ l to 50%, and the east-west direction η _ s to 50% and η _ l to 33%, wherein | η \\ u \\ 33%n-η_e|<10% in the north-south direction, | η \ us-η_l|>10% | η \uin the east-west directions-η_l|>10％；
Therefore, the east-west direction and the south-north direction are not adjusted;
the process of adjusting the time length of the straight-going and left-turning in the north-south direction is as follows:
at this point η _ s < η _ l,
Ts_new＝Ts_old+ΔTs＝40+2＝42s
Tl_new＝Tl_old-ΔTs＝20-2＝18s
in the formula:
Δ Ts: readjusting time for straight left turn at intersection in same direction
Ts _ old: going straight in the same direction for a fixed duration according to Step2, Ts _ old equals 40s since Step2 is entered directly from Step 1.2.1;
ts _ new: fixed length of straight line readjusted in the same direction at intersection
Tl _ old: the same direction left turn according to Step2 is for a fixed duration, namely: since Step2 is entered directly from Step1.2.1, Tl _ old is 20 s;
tl _ new: the straight-going and left-turning time length adjusting process of the left-turning fixed time length in the east-west direction readjusted in the same direction of the intersection is as follows:
at this point η _ s > η _ l,
Ts_new＝Ts_old-ΔTs＝40-3＝37s
Tl_new＝Tl_old+ΔTs＝20+3＝23s
in the formula:
Δ Ts: readjusting time for straight left turn at intersection in same direction
Ts _ old: going straight in the same direction for a fixed duration according to Step2, Ts _ old equals 40s since Step2 is entered directly from Step 1.2.1;
ts _ new: fixed length of straight line readjusted in the same direction at intersection
Tl _ old: the same direction left turn according to Step2 is for a fixed duration, namely:
since Step2 is entered directly from Step1.2.1, Tl _ old is 20 s;
tl _ new: fixed time length of left turn readjusted in same direction at intersection
Example 4, setting the north and south directions of the intersection, setting the current fixed time length Tn to be 60, Te to be 60s, the straight time in each direction to be 40s, the left-turning time to be 20s, setting all the following passing efficiency values to be counted in 30 minutes, setting the efficiency difference comparison value d% to be 10%, η _ n to be 50%, η _ e to be 33%, the north and south directions to be η _ s to be 60%, η _ l to be 45%, and the east and west directions to be η _ s to be 50%, η _ l to be 45%;
at this time | η_n-η_e|>10％；
Therefore, the following adjustment is made
(1) Adjustment in north-south and east-west directions:
Tn_new＝Tn_old-ΔTa＝60-5＝55s
Te_new＝Te_old+ΔTa＝60+5＝65s
in the formula:
Δ Ta: time for readjusting east-west, south-north of intersection
Tn _ old: fixed duration of m time periods in north-south direction
Tn _ new: fixed duration of north-south readjustment
Te _ old: fixed duration of m time periods in east-west direction
Te _ new: fixed duration of east-west readjustment
(2) Adjusting the straight and left turn on the basis of (1):
1) the north-south direction:
① reassign the duration in proportion to the last cycle:
Rn＝Tns_old/(Tns_old+Tnl_old)＝40/(20+40)＝0.6
Tns_new＝Tn_new*Rn＝55*0.6＝33s
Tnl_new＝Tn_new-Tns_new＝55-33＝22s
in the formula:
rn: distribution ratio of one-cycle straight-going and left-turning time length in north-south direction
Tns _ old: fixed time length for straight going of m time intervals in north-south direction
Tnl _ old: left turn fixed time length of m time periods in north-south direction
Tns _ new: fixed duration of north-south straight-line redistribution
Tnl _ new: fixed duration of left turn left reassigned north and south
②|η_s-η_l|>10 percent, so that the south-north straight movement and the left movement are continued on the basis of ①Adjusting the turning time length:
at this point η _ s > η _ l,
Ts_new＝Ts_old-ΔTs＝33-2＝31s
Tl_new＝Tl_old+ΔTs＝22+2＝24s
in the formula:
Δ Ts: readjusting time for straight left turn at intersection in same direction
Ts _ old: when the user enters Step2 for a fixed time period in the same direction, where the user enters Step2 from Step1.2.2, Ts _ old is Tns _ new is 33 s;
ts _ new: fixed length of straight line readjusted in the same direction at intersection
Tl _ old: when entering Step2, the same direction left-turn is performed for a fixed duration, here from Step1.2.2 to Step2, then Tl _ old is Tnl _ new is 22s
Tl _ new: fixed time length of left turn readjusted in same direction at intersection
2) The east-west direction:
① reassign the duration in proportion to the last cycle:
Re＝Tes_old/(Tes_old+Tel_old)＝40/(20+40)＝0.6
Tes_new＝Te_new*Re＝65*0.6＝39s
Tel_new＝Te_new-Tes_new＝65-39＝26s
in the formula:
re: distribution ratio of one-cycle straight-going and left-turning time length in east-west direction
Tes _ old: fixed time length for straight going of m time intervals in east-west direction
Tel _ old: left-turning fixed duration of m time periods in east-west direction
Tes _ new: fixed duration of east-west straightforward reallocation
Tel _ new: fixed duration of east-west left turn reassignment
②|η_s-η_l|<10％，The adjustment of the length of the straight and left turn is not required on the basis of ①.
Since claims 1, 2 of the present invention may yield many specific embodiments, not all of which may be explicitly enumerated, the description is given by way of representation of only the above-described embodiments 2-4.
The design principle of the invention is as follows: the adjustment of the intersection signal lamp control time length is the time length of increasing the traffic flow and the time length of decreasing the traffic flow. The traffic efficiency value counted by the existing traffic intersection database indicates that the traffic flow is smaller when the traffic efficiency value is larger, and the traffic flow is larger when the traffic efficiency value is smaller. Therefore, the reasonability of time length distribution of the south-north direction and east-west direction of the intersection signal lamp and the straight-going and left-turning control time length in the same direction can be adjusted and controlled according to the passing efficiency value.
Description of the formula:
1. written description of the formula
(1) Different directions
The fixed duration is the total duration in north-south direction or the total duration in east-west direction
Traffic efficiency improvement amount ═ (given duration-actual traffic duration)/given duration · 100%
(note: the given duration and the actual duration of one direction include straight and left turns).
(2) In the same direction
The fixed duration is equal to the straight-line duration + the left-turn duration
Traffic efficiency value (given duration-actual traffic duration)/given duration 100%
Description of the parameters of the invention:
setting of adjustment period m: generally, m is a minute unit, the range is limited to 20 minutes to 40 minutes, if the value is smaller, the real-time performance is better, but the frequency of the background database statistics of the device is required to be higher, and the data scale is increased; the value is large, the time length parameter change period is long, and the real-time performance is reduced. Therefore, it is better to take the intermediate value (the actual use value is 30 min).
Setting of the difference in efficiency values compared to the reference value d%: the comparison reference value d% of the difference of the efficiency values is set depending on the value of the total duration in the north-south direction or the east-west direction, if the value is smaller, the change of the duration of the straight-ahead movement and the left-turn in the north-south direction and the east-west direction or the same direction is not large, and the difference has no obvious practical significance; the value is large, so that on one hand, the adjustment condition cannot be met and the effect of non-self-adaption is reflected; on the other hand, a too large value of the change in the duration is rather counterproductive and is therefore moderate and good. The invention sets the total control time length in the north-south direction or the east-west direction to be 60s, and the value of d% is 10% under the condition.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit and scope of the present invention.
Claims (4)
1. The self-adaptive algorithm for controlling the time length of the signal lamp of the intersection is characterized in that: the method comprises the following steps:
firstly, readjusting the time lengths in the east-west direction and the south-north direction under the condition of ensuring that the sum of the time lengths in the east-west direction and the south-north direction of the intersection is not changed, wherein the readjusting comprises the following two conditions:
(1) if the absolute value of the efficiency difference value in the two directions is less than d%, the adjustment is not carried out, and the step two is directly carried out;
(2) if the absolute value of the efficiency difference value in the two directions is greater than or equal to d%, adjusting that the time length of the party with higher traffic efficiency value is reduced, and the time length of the party with lower traffic efficiency value is increased; secondly, on the basis that the fixed time length of the intersection in the east-west direction and the south-north direction is adjusted, the straight-going fixed time length in the same direction and the fixed time length of the left turn are redistributed according to the original distribution proportion of the straight-going fixed time length in the same direction and the left turn at the time interval of m time intervals of the previous adjusted time length, and then the step two is carried out;
step two: readjustment of fixed time length for calculating straight-going left-turn in same direction of intersection
Firstly, calculating the straight-going and left-turning passing efficiency values of the intersection in the same direction within a time interval m of an adjustment duration, and then adjusting the efficiency values according to the following two conditions:
(1) if the absolute value of the difference value of the efficiencies of straight going and left turning at the intersection in the same direction is less than d percent, the adjustment is not carried out;
(2) and if the absolute value of the difference value of the efficiencies of straight going and left turning at the intersection in the same direction is more than or equal to d%, adjusting that the time length of the party with higher traffic efficiency value is reduced, and the time length of the party with lower traffic efficiency value is increased.
2. The adaptive algorithm for controlling the time length of the signal lamp of the intersection according to claim 1, is characterized in that: the method specifically comprises the following steps:
step1, adjusting the fixed time length of the crossing in the east-west direction and the south-north direction;
step1.1: calculating the efficiency values of the passing efficiency of the crossing in the east-west direction and the south-north direction in the time interval of m of the last adjustment time length:
the intersection data acquisition method comprises the following steps of obtaining a time interval intersection data base record table, wherein n in the formula is the record number of an intersection data base record table of an m time period, i is a count, η _ n and η _ e are respectively the counted passing efficiency values of the north and south directions and the east and west directions in the previous time interval m time period, Tn and Te are respectively fixed time periods distributed in the north and south directions and the east and west directions in the previous time interval m time period, and Tn and Te are respectively the actual passing time periods of the north and south directions and the east and west directions in the previous time interval m time period;
step1.2: calculating the fixed time length of the east-west, south-north readjustment of the intersection
Step1.2.1 if the absolute value of η _ n- η _ e < d%, the fixed time lengths of east, west and south of the intersection are not adjusted, at the moment, the fixed time lengths of straight going and left turning in the east, south and north directions are not changed, Tns _ old comprises the fixed time length of straight going in m time intervals in the south and north directions, Tnl _ old comprises the fixed time length of left turning in m time intervals in the south and north directions, Tes _ old comprises the fixed time length of straight going in m time intervals in the east and west directions, and Tel _ old comprises the fixed time length of left turning in m time intervals in the east and west directions, and then Step2 is directly carried out;
step1.2.2 if | η _ n- η _ e | >, d%, then the following steps are performed, and then Step2 is entered:
step1.2.2.1 i) Heo η_n>η_eThen, then
At this time:
Tn_new＝Tn_old-ΔTa
Te_new＝Te_old+ΔTa
in the formula:
d%: comparing the difference of the efficiency values with a reference value, wherein the value of the difference is 10% of the total control time length in the north-south direction and the east-west direction;
Δ Ta: time for readjusting east-west, south-north of intersection
Tn _ old: fixed duration of m time periods in north-south direction
Tn _ new: fixed duration of north-south readjustment
Te _ old: fixed duration of m time periods in east-west direction
Te _ new: fixed duration of east-west readjustment
Ii) if η _ e>η _ n, then
At this time:
Tn_new＝Tn_old+ΔTa
Te_new＝Te_old-ΔTa；
after the duration in each direction is adjusted by Step1.2.2.2, the duration of the straight-going and left-turning in the same direction is redistributed and calculated according to the original distribution proportion in the previous m time period:
the north-south direction:
Rn＝Tns_old/(Tns_old+Tnl_old)
Tns_new＝Tn_new*Rn
Tnl_new＝Tn_new-Tns_new
in the formula:
rn: distribution ratio of one-cycle straight-going and left-turning time length in north-south direction
Tns _ old: fixed time length for straight going of m time intervals in north-south direction
Tnl _ old: left turn fixed time length of m time periods in north-south direction
Tns _ new: fixed duration of north-south straight-line redistribution
Tnl _ new: fixed duration of left turn left reassigned north and south
The east-west direction:
Re＝Tes_old/(Tes_old+Tel_old)
Tes_new＝Te_new*Re
Tel_new＝Te_new-Tes_new
in the formula:
re: distribution ratio of one-cycle straight-going and left-turning time length in east-west direction
Tes _ old: fixed time length for straight going of m time intervals in east-west direction
Tel _ old: left-turning fixed duration of m time periods in east-west direction
Tes _ new: fixed duration of east-west straightforward reallocation
Tel _ new: fixed duration of east-west left turn reassignment
Step 2: calculating the fixed time length of readjustment of straight running and left turning in the same direction:
step2.1, calculating the efficiency values of straight-going and left-turning passing of the intersection within m minutes of the last adjustment time interval:
n in the formula is the record number of an intersection database record table of the m time periods, i is a counting number, η _ s and η _ l are respectively the traffic efficiency values improved by straight running and left turning in all directions counted by an adjustment time period interval m time period in the same direction, Ts and Tl are respectively fixed time periods distributed by straight running and left turning of the adjustment time period interval m time period in the same direction, and Ts and Tl are respectively the actual traffic time periods distributed by straight running and left turning of the adjustment time period interval m time period in the same direction;
step2.2 calculating the readjusted fixed time length of straight going and left turning at the intersection
If the absolute value of η _ s- η _ l is less than d%, the fixed time length of straight going and left turning at the intersection is not adjusted;
if the | η _ s- η _ l | > < d%
I) if η _ s>η_l，
When the given time for the straight and left turn directions is
Ts_new＝Ts_old-ΔTs
Tl_new＝Tl_old+ΔTs
In the formula:
Δ Ts: readjusting time for straight left turn at intersection in same direction
Ts _ old: go straight in the same direction for a fixed duration based on Step2
Ts _ new: fixed length of straight line readjusted in the same direction at intersection
Tl _ old: left turn in the same direction for a fixed duration upon entering Step2
Tl _ new: fixed time length of left turn readjusted in same direction at intersection
Ii) if η _ l>η_s，
The given time for the straight and left turn is
Ts_new＝Ts_old+ΔTs
Tl_new＝Tl_old-ΔTs
In the formula:
Δ Ts: readjusting time for straight left turn at intersection in same direction
Ts _ old: go straight in the same direction for a fixed duration based on Step2
Ts _ new: fixed length of straight line readjusted in the same direction at intersection
Tl _ old: left turn in the same direction for a fixed duration upon entering Step2
Tl _ new: fixed time length of left turn readjusted in same direction at intersection
Step 3: step1 and Step2 are repeatedly executed in sequence at the adjusted time interval m time period.
3. The adaptive algorithm for controlling the time length of the signal lamp of the intersection according to claim 1, is characterized in that: the time interval m of the adaptive adjustment is 30min, and d% is 10%.
4. The self-adaptive algorithm for controlling the time length of the intersection signal lamp is characterized in that Tn, Te, Tn, Te, Ts, Tl, Ts and Tl are respectively stored in each record of an intersection database record table in real time, and η _ n, η _ e, η _ s and η _ l can be directly used by taking values from a daily statistical table of an intersection database.
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