CN102542831A - Variable speed-limit control method of expressway based on real-time traffic flow and weather information - Google Patents
Variable speed-limit control method of expressway based on real-time traffic flow and weather information Download PDFInfo
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Abstract
The invention relates to a variable speed-limit control method of expressway based on real-time traffic flow and weather information, which can automatically regulate the speed limit values under various traffic flows and weather conditions according to real-time change of the traffic flows and the weather states, and send the speed limit message to a driver by a variable message board, so as to reduce traffic accident risk. The invention is featured by making use of a traffic flow detection device and a weather environment detection device to obtain real-time traffic flow and weather parameters, automatically regulating the speed limit according to various traffic flows and weather states to overcome the defect and shortcoming that the prior road speed limit can only be fixed and unchanged. Therefore, a dynamic speed limit method according to the real-time traffic flow and weather information has an actual engineering application value in the expressway traffic management and control aspect.
Description
Technical field
The invention belongs to traffic intelligent management and control technology field, carry out the dynamic Control for Speed Limitation in through street with weather condition, be a kind of through street variable speed-limiting control method based on real-time traffic stream and weather condition according to real-time traffic stream.
Background technology
Highway speed limit problem is the hot issue that traffic safety receives much concern always.According to 2005 and 2006 " The Ministry of Public Security of the People's Republic of China, MOPS's statistics of traffic accidents annual report ", there was 10% accident relevant in 2005～2006 years approximately with the vehicle ' hypervelocity, rank first of the various culprit.Existing research shows that higher travel speed can bring higher risk of collision and severity of injuries; Because under the condition of running at high speed; The driver does not have the enough reflection time to take corresponding measure to avoid dangerous situation to occur, and for example front truck is braked acceleration suddenly, other vehicles get into the track.Thereby under specified link and environmental baseline, if the driver drives to significantly improve road safety by the reasonable speed of a motor vehicle.
Road traffic flow running status real-time change, and traditional road speed limit is a fixed value, can't dynamically carry out speed limit according to Real-time Road traffic flow ruuning situation and regulate.Under some traffic flow modes, vehicle flowrate is bigger, and Vehicle Speed is lower, but speed limit remains higher speed limit, causes the part vehicle speed too fast, has strengthened velocity contrast between the vehicle, thereby has increased accident risk.In addition, therefore the driver causes speed of operation too fast owing to can't understand road ahead traffic behavior (queuing etc. of for example blocking up) easily, when noticing the place ahead traffic problems, has little time to slow down, thereby brings out traffic hazard.Therefore, obtained external numerous traffic scholars' concern in recent years according to the through street variable speed-limiting control method of traffic flow running rate.
Adverse weather not only can produce harmful effect to the vehicle safety operation; And can the appreciable impact driver reflect the time, for example in the greasy weather, because sight line is bad; The driver need recognize leading vehicle distance for more time, thereby speed limit is different from speed limit generally under the adverse weather.The unreasonable speed of a motor vehicle causes the traffic safety accident easily under the adverse weather, and the accident number that existing research is illustrated in adverse weather in the following unit interval of adverse weather is fine several times or even tens times, and is mostly great and serious accident.2007, the traffic hazard under the adverse weather caused about 17600 people in the whole nation dead, and 85200 people are injured, and direct property loss reaches 3.18 hundred million Renminbi.Thereby thereby Speed Limitation on Freeway guarantees that road traffic safety property is important and has practical study meaning problem under the research adverse weather, and there are more and more traffic scholars to put into the research of road traffic safety aspect under the adverse weather both at home and abroad.Adverse weather comprises: mist, rain, snow, wind etc.
Application along with the advanced traffic control system of current I ntelligent Transportation System (ITS) intelligent transportation system and Advanced Transportation Management System (ATMS); Traffic control center can obtain traffic flow accurately and weather data, for example present speed, flow, occupation rate, temperature, visibility, rainfall, pavement state, wind direction etc. in real time through traffic flow and meteorological monitoring equipment.Traffic flow and state of weather Data Acquisition are had laid a good foundation for carrying out based on the dynamically changeable Control for Speed Limitation of real-time traffic stream and Weather information.Utilize all kinds of parameter values of traffic flow and weather monitoring Equipment Inspection; Carry out the calculating of the reasonable speed limit in current through street; And real-time release gives the driver, reduces Vehicle Speed on the road, has the important engineering applying value for improving China's through street traffic safety situation.
Summary of the invention
The problem that the present invention will solve is: traditional road speed limit is a fixed value; Can't dynamically carry out speed limit according to Real-time Road traffic flow ruuning situation regulates; Need overcome the changeless defective of through street speed limit in the past; Foundation is carried out dynamic speed-limiting control method according to real-time traffic stream and state of weather, according to the traffic flow and the weather condition real-time regulated through street speed limit that change, improves traffic safety.
Technical scheme of the present invention is: based on the through street variable speed-limiting control method of real-time traffic stream and Weather information; By control system the speed limit of through street is controlled; Control system comprises checkout equipment, backstage central computer and electronic intelligence plate; Checkout equipment and electronic intelligence plate are arranged on the through street, and the variable-ratio control method is:
1) traffic flow and Weather information checkout equipment are set on through street; Collect the traffic flow and the Weather information of road to be controlled region; Telecommunication flow information comprises speed, flow and occupation rate; Weather information comprises visibility, rainfall, pavement state and wind direction information, and accuracy of detection is to detect once in per 5 minutes;
2) detected each parameter is transferred in the central computer of backstage; Judge the current time simultaneously, the control system only carries out speed limit control at one day 7:00-19:00 in the time period, as not at this moment between in the section; Then show " keeping the speed of a motor vehicle, safety traffic " on the electronic intelligence plate;
3) the real-time traffic stream situation that detects according to coil judges whether traffic flow is in non-freestream conditions; When each track traffic flow average density is greater than 18pcu/km/lane in detected 5 minutes of the traffic flow parameter checkout equipment; Start the variable speed-limit control system; Otherwise the electronic intelligence plate shows this through street acquiescence speed limit; When the difference of detected 85% speed of a motor vehicle of traffic flow parameter checkout equipment and current speed limit in 5 minutes the sense cycle during more than or equal to 5km/h, it is that current speed limit adds 10km/h that the variable speed-limit control system is regulated speed limit automatically; When detected 85% speed of a motor vehicle of traffic flow parameter checkout equipment in the sense cycle and current speed limit value difference be less than or equal to-during 5km/h, it is that current speed limit subtracts 10km/h that the variable speed-limit control system is regulated speed limit automatically; When the absolute value of the difference of detected 85% speed of a motor vehicle and current speed limit in the sense cycle during, do not regulate current speed limit less than 5km/h;
4) judge whether to occur the adverse weather condition according to the detected meteorologic parameter of weather monitoring device, thereby determine whether to start variable speed-limit control; Detected meteorologic parameter is transferred in the central computer of backstage; According to the automatic compute optimal speed limit of each meteorologic parameter: calculate the visibility speed limit according to the road state of visibility; Calculate the rainfall speed limit according to the rainfall situation, go out icing speed limit, calculate the wind-force speed limit according to the wind direction situation according to state computation icy on road; 4 speed limits that calculate compare, and get value that wherein speed limit the is minimum meteorological safety speed-limit value as current through street;
5) get according in the speed limit that calculates under traffic flow modes and the adverse weather condition than low value as the current safety speed limit;
6) the current safety speed limit and the highest and minimum permission speed limit of through street that step 5) are calculated compare, and judge whether the current safety speed limit needs to regulate; , between said the highest and minimum speed limit, then can be used as under precondition optimum speed limit and issue like the current safety speed limit with this speed limit; If not between said the highest and minimum permission speed limit, then in the highest and minimum permission speed limit, select to issue as optimum speed limit under precondition near the value of the current safety speed limit of step 5);
7) accomplish after 5 minutes the detection of one-period, the control system detects traffic flow and state of weather in the next cycle automatically, dynamically adjusts optimum speed limit based on real road traffic and weather condition and issues.
The highway section that the different speed limits of multistage are arranged when through street; Every section is carried out variable speed-limit control respectively; Highway section by the control of through street final stage variable speed-limit begins; Detect speed limit poor in itself and adjacent upstream variable speed-limit control highway section, the speed limit value difference otherwise reduces the speed limit in the higher highway section of speed limit smaller or equal to 20km/h between two adjacent variable speed-limit control highway sections; This process reaches first variable speed-limit control highway section of through street up to detection and finishes, and confirms the optimum speed limit in each variable speed-limit control highway section.
Each optimum speed limit in variable speed-limit control highway section and the actual speed limit in current each highway section confirmed are compared; If the difference of each optimum speed limit in variable speed-limit control highway section and each actual speed limit in highway section is greater than 10km/h; Then adjust, adjust the speed limit change step at every turn and be no more than 10km/h;
Each highway section speed limit of confirming is issued through trackside electronic variable advices plate, realized based on of the through street variable speed-limit control of real-time traffic stream with Weather information.
When traffic flow and the detected traffic flow of weather detecting device and state of weather become when good, close the variable speed-limit regulation and control system, the through street speed limit reverts to initial default value, i.e. highway section Maximum speed limit value.
The invention discloses a kind of through street variable speed-limiting control method based on real-time traffic stream and Weather information, detection system is gathered road real-time traffic stream and state of weather through traffic flow and weather monitoring equipment according to some cycles; According to the traffic flow and the weather parameters of gathering, calculate optimum speed limit under current traffic flow and the weather condition, and judge whether to launch variable speed-limit control; If launch variable speed-limit control, the trackside variable information board is then issued new speed limit, if start-up system not then gets into next cycle, judges according to next periodic condition.Thereby advantage of the present invention is to utilize traffic flow and weather monitoring equipment to obtain real-time traffic stream and state of weather carries out dynamic speed limit and regulates, and has overcome the shortcomings and deficiencies that speed limit in the past can't be regulated according to the traffic flow that changes and state of weather.Thereby this method is carrying out having the practical project applying value aspect dynamic speed limit management and the control according to real-time traffic stream and weather condition.
Description of drawings
Fig. 1 starts decision flow chart for variable speed-limit control.
Fig. 2 is a reasonable speed limit calculation flow chart under the adverse weather condition.
Fig. 3 is for to confirm reasonable speed limit flow chart based on traffic flow modes.
Embodiment
The present invention proposes a kind of stream with Weather information and carry out the through street variable speed-limiting control method, may further comprise the steps based on real-time traffic:
1) traffic flow and Weather information checkout equipment are set on through street; Collect the traffic flow and the Weather information of road to be controlled region; Telecommunication flow information comprises speed, flow, occupation rate; Weather information comprises visibility, rainfall, pavement state, wind direction information, and accuracy of detection is to detect once in per 5 minutes.
2) detected each parameter is transferred in the central computer.Judge the current time simultaneously, variable speed-limit control system interior control of (7:00AM-7:00PM) time period is only by day used.As not at this moment between in, then show " keeping the speed of a motor vehicle, safety traffic " on the electronic intelligence plate.
3) the real-time traffic stream situation that detects according to coil judges whether traffic flow is in non-freestream conditions; When each track traffic flow average density is greater than 18pcu/km/lane in detected 5 minutes of the traffic flow parameter checkout equipment; Start the variable speed-limit control system; Like Fig. 1, otherwise the electronic intelligence plate shows this through street acquiescence speed limit; When the difference of detected 85% speed of a motor vehicle of traffic flow parameter checkout equipment and current speed limit in 5 minutes the sense cycle during more than or equal to 5km/h, it is that current speed limit adds 10km/h that the variable speed-limit control system is regulated speed limit automatically; When detected 85% speed of a motor vehicle of traffic flow parameter checkout equipment in the sense cycle and current speed limit value difference be less than or equal to-during 5km/h, it is that current speed limit subtracts 10km/h that the variable speed-limit control system is regulated speed limit automatically; When the absolute value of the difference of detected 85% speed of a motor vehicle and current speed limit in the sense cycle during, do not regulate current speed limit less than 5km/h;
4) judge whether to occur the adverse weather condition according to the detected meteorologic parameter of weather monitoring device, thereby determine whether to start variable speed-limit control, like Fig. 2; Detected meteorologic parameter is transferred in the central computer of backstage; According to the automatic compute optimal speed limit of each meteorologic parameter: calculate the visibility speed limit according to the road state of visibility; Calculate the rainfall speed limit according to the rainfall situation, go out icing speed limit, calculate the wind-force speed limit according to the wind direction situation according to state computation icy on road; 4 speed limits that calculate compare, and get value that wherein speed limit the is minimum meteorological safety speed-limit value as current through street;
5) get according in the speed limit that calculates under traffic flow modes and the adverse weather condition than low value as the current safety speed limit;
6) the current safety speed limit and the highest and minimum permission speed limit of through street that step 5) are calculated compare, and judge whether the current safety speed limit needs to regulate; , between said the highest and minimum speed limit, then can be used as under precondition optimum speed limit and issue like the current safety speed limit with this speed limit; If not between said the highest and minimum permission speed limit, then in the highest and minimum permission speed limit, select to issue as optimum speed limit under precondition near the value of the current safety speed limit of step 5);
7) accomplish after 5 minutes the detection of one-period, the control system detects traffic flow and state of weather in the next cycle automatically, dynamically adjusts optimum speed limit based on real road traffic and weather condition and issues.
The highway section that the different speed limits of multistage are arranged when through street; Every section is carried out variable speed-limit control respectively; Each difference of controlling the speed limit in highway section need keep within the specific limits, prevents that upstream and downstream speed limit gap is excessive traffic flow to be caused disturbance, the line traffic control stage promptly shown in Figure 3; The present invention is begun by the highway section of through street final stage variable speed-limit control; Detect speed limit poor in itself and adjacent upstream variable speed-limit control highway section, the speed limit value difference otherwise reduces the speed limit in the higher highway section of speed limit smaller or equal to 20km/h between two adjacent variable speed-limit control highway sections; This process reaches first variable speed-limit control highway section of through street up to detection and finishes, and confirms the optimum speed limit in each variable speed-limit control highway section.
For avoiding each highway section speed limit to change excessive; Each optimum speed limit in variable speed-limit control highway section and the actual speed limit in current each highway section confirmed are compared; If the difference of each optimum speed limit in variable speed-limit control highway section and each actual speed limit in highway section is greater than 10km/h; Then adjust, adjust the speed limit change step at every turn and be no more than 10km/h;
Each highway section speed limit of confirming is issued through trackside electronic variable advices plate, realized based on of the through street variable speed-limit control of real-time traffic stream with Weather information.
When traffic flow and the detected traffic flow of weather detecting device and state of weather become when good, close the variable speed-limit regulation and control system, the through street speed limit reverts to initial default value, i.e. highway section Maximum speed limit value.
Confirmed under the traffic flow running rate behind the reasonable speed limit that central computer sends the electronic variable advices plate that trackside is regulated in instruction, and new speed-limiting messages is distributed to the driver.Simultaneously can issue corresponding warning information, for example " the place ahead blocks up, and slows down to go slowly " etc. to the driver.
Because this method can be according to the real-time traffic stream reasonable speed limit with Weather information dynamic adjustments through street, so this method has practical engineering application value aspect through street traffic administration and the control.
Claims (4)
1. based on the through street variable speed-limiting control method of real-time traffic stream and Weather information; It is characterized in that the speed limit of through street being controlled by control system; Control system comprises checkout equipment, backstage central computer and electronic intelligence plate; Checkout equipment and electronic intelligence plate are arranged on the through street, and the variable-ratio control method is:
1) traffic flow and Weather information checkout equipment are set on through street; Collect the traffic flow and the Weather information of road to be controlled region; Telecommunication flow information comprises speed, flow and occupation rate; Weather information comprises visibility, rainfall, pavement state and wind direction information, and accuracy of detection is to detect once in per 5 minutes;
2) detected each parameter is transferred in the central computer of backstage; Judge the current time simultaneously, the control system only carries out speed limit control at one day 7:00-19:00 in the time period, as not at this moment between in the section; Then show " keeping the speed of a motor vehicle, safety traffic " on the electronic intelligence plate;
3) the real-time traffic stream situation that detects according to coil judges whether traffic flow is in non-freestream conditions; When each track traffic flow average density is greater than 18pcu/km/lane in detected 5 minutes of the traffic flow parameter checkout equipment; Start the variable speed-limit control system; Otherwise the electronic intelligence plate shows this through street acquiescence speed limit; When the difference of detected 85% speed of a motor vehicle of traffic flow parameter checkout equipment and current speed limit in 5 minutes the sense cycle during more than or equal to 5km/h, it is that current speed limit adds 10km/h that the variable speed-limit control system is regulated speed limit automatically; When detected 85% speed of a motor vehicle of traffic flow parameter checkout equipment in the sense cycle and current speed limit value difference be less than or equal to-during 5km/h, it is that current speed limit subtracts 10km/h that the variable speed-limit control system is regulated speed limit automatically; When the absolute value of the difference of detected 85% speed of a motor vehicle and current speed limit in the sense cycle during, do not regulate current speed limit less than 5km/h;
4) judge whether to occur the adverse weather condition according to the detected meteorologic parameter of weather monitoring device, thereby determine whether to start variable speed-limit control; Detected meteorologic parameter is transferred in the central computer of backstage; According to the automatic compute optimal speed limit of each meteorologic parameter: calculate the visibility speed limit according to the road state of visibility; Calculate the rainfall speed limit according to the rainfall situation, go out icing speed limit, calculate the wind-force speed limit according to the wind direction situation according to state computation icy on road; 4 speed limits that calculate compare, and get value that wherein speed limit the is minimum meteorological safety speed-limit value as current through street;
5) get according in the speed limit that calculates under traffic flow modes and the adverse weather condition than low value as the current safety speed limit;
6) the current safety speed limit and the highest and minimum permission speed limit of through street that step 5) are calculated compare, and judge whether the current safety speed limit needs to regulate; , between said the highest and minimum speed limit, then can be used as under precondition optimum speed limit and issue like the current safety speed limit with this speed limit; If not between said the highest and minimum permission speed limit, then in the highest and minimum permission speed limit, select to issue as optimum speed limit under precondition near the value of the current safety speed limit of step 5);
7) accomplish after 5 minutes the detection of one-period, the control system detects traffic flow and state of weather in the next cycle automatically, dynamically adjusts optimum speed limit based on real road traffic and weather condition and issues.
2. the through street variable speed-limiting control method based on real-time traffic stream and Weather information according to claim 1; It is characterized in that having the highway section of the different speed limits of multistage when through street; Every section is carried out variable speed-limit control respectively, is begun by the highway section of through street final stage variable speed-limit control, detects it and controls speed limit poor in highway section with the adjacent upstream variable speed-limit; The speed limit value difference is smaller or equal to 20km/h between two adjacent variable speed-limit control highway sections; Otherwise reduce the speed limit in the higher highway section of speed limit, this process reaches first variable speed-limit control highway section of through street up to detection and finishes, and confirms the optimum speed limit in each variable speed-limit control highway section.
3. based on the described through street variable speed-limiting control method of claim 2 based on real-time traffic stream and Weather information; It is characterized in that each optimum speed limit in variable speed-limit control highway section and the actual speed limit in current each highway section that will confirm compare; If the difference of each optimum speed limit in variable speed-limit control highway section and each actual speed limit in highway section is greater than 10km/h; Then adjust, adjust the speed limit change step at every turn and be no more than 10km/h;
Each highway section speed limit of confirming is issued through trackside electronic variable advices plate, realized based on of the through street variable speed-limit control of real-time traffic stream with Weather information.
4. the through street variable speed-limiting control method based on real-time traffic stream and Weather information according to claim 1; It is characterized in that becoming when good when traffic flow and the detected traffic flow of weather detecting device and state of weather; Close the variable speed-limit regulation and control system; The through street speed limit reverts to initial default value, i.e. highway section Maximum speed limit value.
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