CN110189530B - Signal control intervention method for road section emergent traffic incident - Google Patents
Signal control intervention method for road section emergent traffic incident Download PDFInfo
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Abstract
The invention relates to a signal control intervention method for a road section emergent traffic incident. According to the method, whether the traffic accident occupies the lane to influence normal traffic is calculated according to real-time flow and historical flow analysis of the downstream intersection of the traffic accident, a signal control scheme of the downstream signalized intersection and slow-in and fast-out schemes of a plurality of upstream intersections are determined according to the influence degree, and the induction information is issued by combining an induction screen at an appropriate position upstream. According to the method, the influence of the incident is analyzed while the road section emergency is detected, the influence relation of the incident on the upstream and downstream intersections is determined, and the upstream and downstream intersection signal schemes are accurately adjusted according to the influence relation. The influence on the surrounding intersections is reduced to the maximum extent while evacuating the event.
Description
Technical Field
The invention belongs to the field of intelligent traffic control, and particularly relates to a signal control intervention method for a road section emergent traffic incident.
Background
With the rapid development of economy in China, the quantity of automobile reserves in cities is continuously increased, and traffic jam is aggravated by the increasingly frequent occurrence of traffic events, particularly in the early and late rush hours. Evacuation traffic events are a normal task faced by traffic managers. The traditional evacuation mode mainly depends on traffic police to conduct traffic guidance on site, on one hand, a large amount of police force needs to be input, the police force in the peak period is often difficult to guarantee, on the other hand, the traffic police needs a certain time to arrive at the site, and the event cannot be timely processed, so that the congestion is easily caused to spread, and even large-area traffic congestion is caused.
At present, a large number of traffic flow detectors are arranged in each city in the construction of intelligent traffic, and adaptive signal control is carried out. However, the current adaptive control mainly aims at controlling a normal traffic scene, and carries out real-time adjustment of a scheme along with the change of traffic flow, and for an abnormal scene such as a traffic event, the traditional adaptive control usually optimizes a proper and opposite effect. For example, when a traffic event causes that a lane is occupied, the passing traffic flow is obviously reduced, and the flow is considered to be reduced by the traditional adaptive control logic, so that a small-cycle signal control scheme is adopted, and the traffic jam is further aggravated.
The signal control method aiming at the traffic incident can timely and effectively evacuate traffic jam under the condition of the traffic incident, and can be used as an emergency plan for special activities, such as school development, market activities and the like, so as to carry out special control and relieve the jam caused by the activities.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a signal control intervention method aiming at sudden congestion of a road section.
The main conception of the technical scheme of the invention is as follows: according to real-time flow and historical flow analysis of a downstream intersection of a traffic event, whether the event occupies a lane to influence normal traffic is calculated, then according to the influence degree, a signal control scheme of the downstream signalized intersection and slow-in and fast-out schemes of a plurality of upstream intersections are determined, and induction information is issued at an appropriate upstream position in combination with an induction screen.
The method comprises the following steps:
step 1, counting historical synchronization data and real-time data of two recent weeks of the entrance direction of a downstream intersection, and comparing the historical synchronization data and the real-time data;
step 2, determining the influence degree of the event according to the comparison result;
step 3, calculating a signal intervention scheme of the downstream intersection;
step 4, calculating a slow-in and fast-out scheme of the upstream intersection;
and 5, releasing the induction information.
And 6, judging whether the event is cleared or not, and if the event is cleared, removing the signal intervention scheme and recovering the autonomous control.
The invention has the beneficial effects that: according to the method, the influence of the incident is analyzed while the road section emergency is detected, the influence relation of the incident on the upstream and downstream intersections is determined, and the upstream and downstream intersection signal schemes are accurately adjusted according to the influence relation. The influence on the surrounding intersections is reduced to the maximum extent while evacuating the event.
Drawings
FIG. 1 is a flow chart of signal intervention for road segment emergencies.
FIG. 2 is a schematic diagram of detector placement and location of event occurrences.
Detailed Description
The invention is further described below with reference to the accompanying drawings. As shown in fig. 1, the present invention comprises the steps of:
step 1, counting historical synchronization data and real-time data of two recent weeks of the entrance direction of a downstream intersection, and comparing the historical synchronization data and the real-time data;
1) each lane of the downstream intersection is provided with a flow detector, as shown in fig. 2, data is stored in units of 5 minutes, including flow and occupancy data of each lane, and the data format is as follows:
2) calculating the flow of all lanes of the inlet road of the downstream intersection and the flow average value descending proportion p1 of historical synchronous 2 weeks:
wherein q isdownRepresents the sum of the real-time flow rates of all the lanes of the inlet road at the downstream crossing at the time of the event, qdown0Representing the average of historical contemporaneous flow.
3) And respectively calculating the ratio of the historical synchronous upstream driving detection flow to the direction flow of the downstream intersection and the real-time ratio. And calculating the reduction ratio p 2:
wherein q isupThe sum of all the lane flows of the upstream intersection entering the road section at the time of the event occurrence is represented, including the straight-driving vehicle entering the upstream intersection and the left-right-turning vehicle entering the upstream intersection. q. q.sup0Representing the average of the upstream historical contemporaneous flow.
Step 2, determining the influence degree of the event according to the comparison result;
if p1>θ1And p2>θ2Then the traffic incident is deemed to affect normal traffic on the road segment, the vehicle is congested at the incident location, resulting in reduced downstream traffic and the road segment creates a backlog of vehicles. Wherein theta is1And theta2Settings may be made to take 0.3 by default. And (3) when the two indexes simultaneously meet the conditions, performing signal intervention on the downstream crossing, otherwise, performing slow advance control on the upstream crossing only.
Step 3, calculating a signal intervention scheme of the downstream intersection;
when the event causes the green light in the inlet direction of the downstream intersection to be empty, if the intersection has the over-saturation condition in other directions, the duration of the green light is adjusted, and the empty time of the green light is reduced to the saturation phase. The method comprises the following specific steps:
1) judging the saturation of each phase, and if the saturation is greater than 0.9, determining that the phase is in a saturated state, namely:
q represents the real-time flow for a certain phase and s represents the saturated flow for that phase.
2) If the saturation is larger than the threshold value, calculating the green light compression time deltag of the event influence phase, namely:
Δg＝g×p1
3) Δ g is assigned to the saturated phase in proportion to the split ratio in the original scheme.
Step 4, calculating a slow-forward scheme of the upstream intersection;
after the congestion is caused by the event, the interception at only one intersection at the upstream is easy to cause the abnormal congestion at the intersection at the upstream, so that the upstream multi-stage interception control is needed. The method comprises the following specific steps:
1) calculating the traffic flow required to be slowly intercepted in the event road section
In the formula, Δ Q represents the deviation of the traffic of the entrance and the exit of the intersection between the upstream and the downstream of the event
2) Signal adjustment scheme for calculating upstream intersection
Green light time compression is carried out on the straight-going and left-turning directions driven into the upstream intersection, vehicles turning right are generally not controlled by signals, and the green light time compression ratio is as follows:
∑i∈upqirepresenting the sum of all the flow of the incoming traffic at the intersection on the event road section.
3) Signal adjustment scheme for calculating other upstream multilevel intersections
Setting the farthest upstream control intersection as n levels, and in order to balance the pressure shared by each road section, the pressure sharing proportion of the jth level control intersection should be:
and 5, releasing the induction information.
In the range of n-level intersections at the upstream, for intersections with a guidance screen, a prompt of 'congestion of events ahead, attention to detour ahead' is issued.
And 6, judging whether the event is cleared or not, and if the event is cleared, removing the signal intervention scheme and recovering the autonomous control.
Whether the event is cleared is judged mainly by judging whether the event continuously affects the traffic of the road section, and the following two judgment conditions are specifically adopted:
1) the traffic state of the event road section is recovered to be smooth;
2) the traffic flow of the downstream crossing of the event is recovered to be normal or reaches saturation;
when any condition is met, the traffic operation of the road section is recovered to be normal, and the original control scheme is recovered at the upstream intersection and the downstream intersection.
Claims (3)
1. A signal control intervention method for road section emergent traffic incidents is characterized by comprising the following steps:
step 1, counting historical contemporaneous data and real-time data of two recent weeks of the entrance direction of a downstream intersection, and comparing the historical contemporaneous data and the real-time data, wherein the historical contemporaneous data and the real-time data are specifically as follows:
calculating the flow of all lanes of the inlet road of the downstream intersection and the flow average value descending proportion p1 of two weeks in the history period:
wherein q isdownRepresents the time of the event, the sum of the real-time flow of all lanes of the inlet lane of the downstream intersection within five minutes, qdown0The average value of the flow of two weeks in the same period of the history is shown;
respectively calculating the ratio of the historical upstream driving detection flow and the direction flow of the downstream intersection in the same period, and the real-time ratio, and calculating the descending proportion p 2:
wherein q isupRepresenting the occurrence time of the event, the sum of all lane flows of the upstream intersection entering the road section, including the straight-going entering vehicle and the left-right turning entering vehicle of the upstream intersection; q. q.sup0An average value representing an upstream historical contemporaneous flow;
and 2, determining the influence degree of the event according to the comparison result, specifically:
if p1>θ1And p2>θ2If the traffic accident affects normal traffic of the road section, the vehicles are jammed at the position of the accident, so that the downstream flow is reduced, and the vehicle backlog is generated on the road section; wherein theta is1And theta2All the values are threshold values and can be set; when the two indexes simultaneously meet the conditions, entering step 3, and performing signal intervention on the downstream crossing, or entering step 4, and only performing slow advance control on the upstream crossing;
step 3, calculating a signal intervention scheme of the downstream intersection, and if the green light in the inlet direction of the downstream intersection is empty due to a traffic event, if the intersection has supersaturation conditions in other directions, adjusting the duration of the green light, and reducing the empty time of the green light to a saturation phase;
step 4, calculating a slow-in and fast-out scheme of the upstream intersection, and after an event causes congestion, intercepting only by one upstream intersection easily causes abnormal congestion of the upstream intersection, and requiring upstream multi-stage interception control;
step 5, releasing induction information;
step 6, judging whether the event is cleared or not, if the event is cleared, removing the signal intervention scheme, and recovering the autonomous control;
wherein the step 4 specifically comprises the following steps:
1) calculating the traffic flow required to be slowly intercepted in the event road section
In the formula, delta Q represents the deviation of the traffic of the entrance and the exit of the crossroads of the upstream and the downstream of the event;
2) signal adjustment scheme for calculating upstream intersection
Green light time compression is carried out on the straight going and left turning directions driven into the upstream intersection, and the green light time compression ratio is as follows:
∑i∈upqirepresenting the sum of all the flow of the driving traffic flow at the upstream intersection of the event road section;
3) signal adjustment scheme for calculating other upstream multilevel intersections
Setting the farthest upstream control intersection as n levels, and in order to balance the pressure shared by each road section, the pressure sharing proportion of the jth level control intersection should be:
2. the signal control intervention method for the road section emergent traffic incident according to claim 1, characterized in that: the step 3 is specifically as follows:
1) judging the saturation of each phase, and if the saturation is greater than 0.9, determining that the phase is in a saturated state, namely:
q represents the real-time flow of a certain phase, and s represents the saturated flow of the phase;
2) if the saturation is larger than the threshold value, calculating the green light compression time deltag of the event influence phase, namely:
Δg＝g×p1
3) Δ g is assigned to the saturated phase in proportion to the split ratio in the original scheme.
3. The signal control intervention method for the road section emergent traffic incident according to claim 1, characterized in that: the step 6 is specifically as follows:
whether the event is cleared is judged mainly by judging whether the event continuously affects the traffic of the road section, and the following two judgment conditions are specifically adopted:
1) the traffic state of the event road section is recovered to be smooth;
2) the traffic flow of the downstream crossing of the event is recovered to be normal or reaches saturation;
when any condition is met, the traffic operation of the road section is recovered to be normal, and the original control scheme is recovered at the upstream intersection and the downstream intersection.
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| CN114664086B (en) * | 2019-12-18 | 2023-11-24 | 北京嘀嘀无限科技发展有限公司 | Method, device, electronic equipment and storage medium for controlling information release |
| CN111127887B (en) * | 2019-12-19 | 2021-03-16 | 银江股份有限公司 | Signal control optimization system and method based on real-time traffic state driving |
| CN113223306B (en) * | 2021-04-26 | 2023-07-11 | 青岛海信网络科技股份有限公司 | Signal lamp control method, device, equipment and medium |
| CN114170792A (en) * | 2021-11-01 | 2022-03-11 | 中汽创智科技有限公司 | Traffic dispersion method, device, system and storage medium |
| CN114373310A (en) * | 2022-01-19 | 2022-04-19 | 京东方科技集团股份有限公司 | Index data processing method and device for vehicle driving road section and electronic equipment |
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