CN108615372B - Signal control optimization method in rainfall environment - Google Patents

Signal control optimization method in rainfall environment Download PDF

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CN108615372B
CN108615372B CN201810436132.7A CN201810436132A CN108615372B CN 108615372 B CN108615372 B CN 108615372B CN 201810436132 A CN201810436132 A CN 201810436132A CN 108615372 B CN108615372 B CN 108615372B
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rainfall
weather
level
signal
rainfall weather
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CN108615372A (en
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徐良杰
鄢辉武
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Wuhan University of Technology WUT
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    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/07—Controlling traffic signals

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Abstract

The invention provides a signal control optimization method in a rainfall environment. The invention defines the rainfall weather grade according to the rainfall in unit hour; calculating signal periods of different rainfall weather levels according to the total signal loss time of different rainfall weather levels, the sum of the flow rate ratios of the key lane groups of all phases in the signal period and the rainfall period extension coefficient; and calculating the green light control time of each phase according to the signal period of different rainfall weather levels, the total signal loss time, the sum of the flow rate ratios of the key lane groups of all phases in the signal period and the flow rate ratio of the key lane group of each phase. The invention relieves the intersection congestion caused by rainfall and reduces the intersection delay.

Description

Signal control optimization method in rainfall environment
Technical Field
The invention belongs to the field of road traffic auxiliary facilities, and particularly relates to a signal control optimization method in a rainfall environment.
Background
The city in south of China is subject to plum rain weather of different degrees every year, rainfall can change the driving environment, and the specific expression is in the reduction of visibility and road surface adhesion coefficient, so that the reaction time of a driver is prolonged, the road surface is easy to slip and even turn over, the driving speed is often reduced for ensuring the driving safety, the following distance is increased, the traffic flow characteristic is changed, so that the intersection delay is increased, and the road traffic capacity is reduced. At this time, signal timing in normal weather is not suitable for traffic flow in rainfall weather, and traffic jam of urban arterial roads in rainy weather is more serious, so that urban signal intersections in rainfall weather need to be optimized on the basis of traffic flow characteristics in rainfall weather.
The signal control of the urban intersection at present is divided into passive control and active control, the passive control is controlled according to the signal cycle, phase and green light time that are set up in advance, the advantage of this control method is with low costs, so apply extensively, but the disadvantage is obvious too, the signal time does not change with the change of the environment, the adaptability is poorer; the active control method has the advantages that the signal control scheme is generated in real time according to the traffic volume, but the rainfall factor is not considered in the calculation of the signal control scheme. The speed and headway of the vehicle are significantly changed in the rainy weather, the change of the traffic volume is only considered in the active control, and the two methods are not correspondingly optimized for the change. The invention provides a signal control optimization method under a rainfall environment aiming at traffic flow parameter changes under the rainfall weather.
Disclosure of Invention
Aiming at the problem that the rainfall factor is not considered in the active control, the invention provides a signal control optimization method in the rainfall environment.
The technical scheme of the invention is a signal control optimization method under a rainfall environment, which is characterized by comprising the following steps:
step 1: defining the rainfall weather grade according to the rainfall in unit hour;
step 2: calculating signal periods of different rainfall weather levels according to the total signal loss time of different rainfall weather levels, the sum of the flow rate ratios of the key lane groups of all phases in the signal period and the rainfall period extension coefficient;
and step 3: and calculating the green light control time of each phase according to the signal period of different rainfall weather levels, the total signal loss time, the sum of the flow rate ratios of the key lane groups of all phases in the signal period and the flow rate ratio of the key lane group of each phase.
Preferably, the rainfall weather grade in step 1 is:
if the rainfall in unit hour is 0, the weather is zero-order rainfall, namely sunny weather;
if the rainfall per hour is (0,10 mm), the rainfall is first-grade rainfall weather;
if the rainfall per hour (10mm,25 mm), it is the second-level rainfall weather;
if the rainfall per hour is (25mm,45 mm), the rainfall is in third-level rainfall weather;
if the rainfall in unit hour is more than 45mm, the weather is four-level rainfall weather;
preferably, the total loss time of the signals of different rainfall weather levels in the step 2 is as follows:
Figure GDA0002943263480000021
wherein L iswTotal signal loss time, h, for w-level rainfall weatherjFor the headway, h, of the jth vehicle in the queuewSaturated headway for w-level rainfall weather, P is the distance from the stop line to the far-end conflicted pedestrian crossing crosswalk, l is the length of the vehicle body, v15At 15% vehicle speed, i.e. based on historical vehicle passing stopsThe speed of the lane;
VH＝[V1,V2,...,VM]medium selecting speed VmSo that VH＝[V1,V2,...,VM]Medium speed less than or equal to VmThe number X of the vehicles satisfies that X/M is approximately equal to 0.15, VmI.e. 15% of the vehicle speed v15；
In the step 2, the sum of the flow rate ratios of the key lane groups of all phases in the signal period of different rainfall weather levels is as follows:
Figure GDA0002943263480000022
wherein, YwIs the sum of the flow rate ratios of the key lane groups of all phases in the signal period of the w-level rainfall weather, N is the number of phases, yw,iCritical lane group flow rate ratio for ith phase of w-level rainfall weather:
Figure GDA0002943263480000023
where N is the number of phases, qw,iMaximum traffic volume, h, for the ith phase critical lane group for w-level rainfall weatherwThe saturated headway is w-level rainfall weather;
the rainfall period extension coefficients of different rainfall weather grades in the step 2 are as follows:
Figure GDA0002943263480000031
wherein h iswSaturated headway, h, for w-level rainfall weather0The saturated headway in 0-level rainfall weather is the saturated headway in fine days;
the signal periods of different rainfall weather levels in the step 2 are as follows:
Figure GDA0002943263480000032
wherein, TwSignal period of w-level rainfall weather;
preferably, the green light control time of each phase in step 3 is:
Figure GDA0002943263480000033
and controlling the traffic of the intersection according to the ith phase green light control time of the w-level rainfall weather. The invention has the following beneficial effects: the signal control method under the rainfall condition provides the intersection signal control method under different rainfall intensities, relieves the intersection congestion caused by rainfall, reduces the intersection delay, grades the rainfall intensity according to the influence of rainfall with different intensities on the traffic flow, realizes precise management, and provides a basis for traffic management and control optimization.
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FIG. 1: is a flow chart of the method of the present invention;
FIG. 2: are schematic illustrations of embodiments of the invention.
Detailed Description
In order to facilitate the understanding and implementation of the present invention for those of ordinary skill in the art, the present invention is further described in detail with reference to the accompanying drawings and examples, it is to be understood that the embodiments described herein are merely illustrative and explanatory of the present invention and are not restrictive thereof.
FIG. 1 is a process flow diagram; as shown in fig. 2, in the embodiment of the present invention, a magnetic induction coil is provided at each entrance, including an upward detection coil and a stop line detection coil which flow to the entrance of the lane differently. An upstream detection coil for detecting the flow entering the inlet passage; and the stop line detection coil is used for detecting the flow leaving the intersection, and the maximum flow between the two detectors of each lane group is the flow of the key lane group and is used for calculating signal timing. And a rainfall sensor in the rainfall measuring instrument detects rainfall information in real time. The '1' is an ascending detection coil, the '2' is a stop line detection coil, the number of vehicles in the two coils is the traffic volume of the entrance, and the time difference of passing through the stop line detection coil in sequence is the time interval of the vehicle head.
The specific steps of the embodiments of the present invention are discussed below in conjunction with fig. 1-2:
step 1: defining the rainfall weather grade according to the rainfall in unit hour;
the rainfall weather grade in the step 1 is as follows:
if the rainfall in unit hour is 0, the weather is zero-order rainfall, namely sunny weather;
if the rainfall per hour is (0,10 mm), the rainfall is first-grade rainfall weather;
if the rainfall per hour (10mm,25 mm), it is the second-level rainfall weather;
if the rainfall per hour is (25mm,45 mm), the rainfall is in third-level rainfall weather;
if the rainfall in unit hour is more than 45mm, the weather is four-level rainfall weather;
step 2: calculating signal periods of different rainfall weather levels according to the total signal loss time of different rainfall weather levels, the sum of the flow rate ratios of the key lane groups of all phases in the signal period and the rainfall period extension coefficient;
the total loss time of the signals of different rainfall weather grades in the step 2 is as follows:
Figure GDA0002943263480000041
wherein L iswTotal signal loss time, h, for w-level rainfall weatherjFor the headway, h, of the jth vehicle in the queuewSaturated headway for w-level rainfall weather, P is the distance from the stop line to the far-end conflicted pedestrian crossing crosswalk, l is the length of the vehicle body, v1515% vehicle speed, i.e. the speed of the vehicle passing the stop line according to history;
VH＝[V1,V2,...,VM]medium selecting speed VmSo that VH＝[V1,V2,...,VM]Medium speed less than or equal to VmVehicle (2)The quantity X satisfies X/M ≈ 0.15, VmI.e. 15% of the vehicle speed v15；
In the step 2, the sum of the flow rate ratios of the key lane groups of all phases in the signal period of different rainfall weather levels is as follows:
Figure GDA0002943263480000042
wherein, YwIs the sum of the flow rate ratios of the key lane groups of all phases in the signal period of the w-level rainfall weather, N is the number of phases, yw,iCritical lane group flow rate ratio for ith phase of w-level rainfall weather:
Figure GDA0002943263480000051
where N is the number of phases, qw,iMaximum traffic volume, h, for the ith phase critical lane group for w-level rainfall weatherwThe saturated headway is w-level rainfall weather;
the rainfall period extension coefficients of different rainfall weather grades in the step 2 are as follows:
Figure GDA0002943263480000052
wherein h iswSaturated headway, h, for w-level rainfall weather0The saturated headway in 0-level rainfall weather is the saturated headway in fine days;
the signal periods of different rainfall weather levels in the step 2 are as follows:
Figure GDA0002943263480000053
wherein, TwSignal period of w-level rainfall weather;
and step 3: and calculating the green light control time of each phase according to the signal period of different rainfall weather levels, the total signal loss time, the sum of the flow rate ratios of the key lane groups of all phases in the signal period and the flow rate ratio of the key lane group of each phase.
In the step 3, the green light control time of each phase is as follows:
Figure GDA0002943263480000054
and controlling the traffic of the intersection according to the ith phase green light control time of the w-level rainfall weather.
It should be understood that the above description of the preferred embodiments is given for clarity and not for any purpose of limitation, and that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (2)

1. A signal control optimization method under a rainfall environment is characterized by comprising the following steps:
step 1: defining the rainfall weather grade according to the rainfall in unit hour;
step 2: calculating signal periods of different rainfall weather levels according to the total signal loss time of different rainfall weather levels, the sum of the flow rate ratios of the key lane groups of all phases in the signal period and the rainfall period extension coefficient;
the total loss time of the signals of different rainfall weather grades in the step 2 is as follows:
Figure FDA0002943263470000011
wherein L iswTotal signal loss time, h, for w-level rainfall weatherjFor the headway, h, of the jth vehicle in the queuewSaturated headway for w-level rainfall weather, P is slave parkingThe distance from the line to the far-end conflicted pedestrian crossing crosswalk, l is the length of the vehicle body, v1515% vehicle speed, i.e. the speed of the vehicle passing the stop line according to history;
VH＝[V1,V2,...,VM]medium selecting speed VmSo that VH＝[V1,V2,...,VM]Medium speed less than or equal to VmThe number X of the vehicles satisfies that X/M is approximately equal to 0.15, VmI.e. 15% of the vehicle speed v15；
In the step 2, the sum of the flow rate ratios of the key lane groups of all phases in the signal period of different rainfall weather levels is as follows:
Figure FDA0002943263470000012
wherein, YwIs the sum of the flow rate ratios of the key lane groups of all phases in the signal period of the w-level rainfall weather, N is the number of phases, yw,iCritical lane group flow rate ratio for ith phase of w-level rainfall weather:
Figure FDA0002943263470000013
where N is the number of phases, qw,iMaximum traffic volume, h, for the ith phase critical lane group for w-level rainfall weatherwThe saturated headway is w-level rainfall weather;
the rainfall period extension coefficients of different rainfall weather grades in the step 2 are as follows:
Figure FDA0002943263470000014
wherein h iswSaturated headway, h, for w-level rainfall weather0The saturated headway in 0-level rainfall weather is the saturated headway in fine days;
the signal periods of different rainfall weather levels in the step 2 are as follows:
Figure FDA0002943263470000021
wherein, TwSignal period of w-level rainfall weather;
and step 3: calculating the green light control time of each phase according to the signal period of different rainfall weather levels, the total signal loss time, the sum of the flow rate ratios of the key lane groups of all phases in the signal period and the flow rate ratio of the key lane group of each phase;
in the step 3, the green light control time of each phase is as follows:
Figure FDA0002943263470000022
and controlling the traffic of the intersection according to the ith phase green light control time of the w-level rainfall weather.
2. The signal control optimization method under the rainfall environment according to claim 1, characterized in that: the rainfall weather grade in the step 1 is as follows:
if the rainfall in unit hour is 0, the weather is zero-order rainfall, namely sunny weather;
if the rainfall per hour is (0,10 mm), the rainfall is first-grade rainfall weather;
if the rainfall per hour (10mm,25 mm), it is the second-level rainfall weather;
if the rainfall per hour is (25mm,45 mm), the rainfall is in third-level rainfall weather;
and if the rainfall per hour is more than 45mm, the weather is four-level rainfall weather.
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