KR20140075380A - System and method for entry control based smart - Google Patents

Abstract

The present invention relates to a smart entry control system and an entry control method. More specifically, the system and the method are capable of: preventing aggravation of a bottle neck phenomenon generated in a joint section; maximizing the passing traffic volume; and converting an instable traffic flow to a stable traffic flow. The entry control method performed by using the smart entry control system includes the steps of: receiving a speed of a vehicle which drives a main road at regular time intervals and calculating a mean speed of the received vehicle in order to control traffic lights for determining whether to allow the entry of the vehicle entering the main road from a joint road at a crossroad including the main road and the joint road jointed with the main road; comparing the calculated mean speed and a minimum maintaining threshold to allow the vehicle to enter the main road from the joint road; and controlling the traffic lights to allow the vehicle to enter the main road from the joint road if the mean speed is greater than the minimum maintaining threshold, and controlling the traffic lights to block the vehicle to enter the main road from the joint road if the mean speed is smaller than the minimum maintaining threshold.

Description

TECHNICAL FIELD [0001] The present invention relates to a smart base entry control system and method,

The present invention relates to a smart-based entry control system and method, and more particularly, to an entry control system and method for enabling a main line to maintain optimal traffic flow through entry control using a smart vehicle.

In the IT environment of smart highway, it is necessary to secure smart highway road operation technology that intelligent and advanced the road by developing core technology for realizing integrated control and operation in real time when congestion occurs.

The problem to be solved by the present invention is to develop smart highway road operation technology that pursues intelligence and modernization of road by developing core technology for realizing integrated control and operation in real time when congestion occurs in the IT environment of smart highway And the like.

In addition, the detailed goal is to collect and analyze the current traffic conditions of Smart Highway in order to maintain the condition of the main line and highway main line, and the secondary goal is to minimize the delay and latency in the entry and exit sections.

To this end, the entry control method using the smart-based entry control system of the present invention is a method for controlling the entrance of a vehicle entering the main road from the merging road at an intersection comprising a main road and a merging road joining the main road, Receiving the speed of the vehicle traveling on the main road at a time interval and calculating an average speed of the received vehicle, comparing the calculated average speed with a minimum holding threshold at which the vehicle is permitted to enter the main road on the merge road Controlling the signal lamp to enter the vehicle on the main road from the merging road when the average speed is greater than the minimum maintenance threshold, and when the average speed is smaller than the minimum maintenance threshold, The traffic light is blocked so as to block entry into the main road vehicle .

To this end, the entry control method using the smart-based entry control system of the present invention is a method for controlling the entrance of a vehicle entering the main road from the merging road at an intersection comprising a main road and a merging road joining the main road, Receiving the speed of the vehicle traveling on the main road in time intervals and calculating an average speed of the received vehicle, comparing whether the calculated average speed is included in the speed range required for the traffic light control, Comparing the average speed with a minimum holding threshold at which the vehicle is allowed to enter the main road on the main road, if the average speed is within the speed range; and if the average speed is greater than the minimum holding threshold, Controls the traffic lights to enter the vehicle on the main road, If the group average speed is smaller than the MIN threshold value includes the step of controlling the traffic lights to block the main road from the road vehicle entering the road joining.

It is possible to minimize the bottleneck occurring at the merging point by adjusting the amount of traffic joining the main road from the entering road according to the present invention. In addition, by minimizing the bottleneck occurring at the confluence point, it is possible to prevent the travel time of the vehicle passing along the main road from being delayed.

In addition, there is an advantage that the amount of exhaust gas emission can be reduced by preventing the travel time of the vehicle passing along the main road from being delayed.

1 is a block diagram illustrating a schematic configuration of a control system for smart entry according to an embodiment of the present invention.
FIG. 2 is a conceptual diagram of signal operation for entry control for maintaining a merging part speed according to an embodiment of the present invention.
FIG. 3 illustrates an entry control process for maintaining a merging portion speed according to an embodiment of the present invention.
FIG. 4 shows experimental results according to the proposed process.

BRIEF DESCRIPTION OF THE DRAWINGS The foregoing and further aspects of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

1 is a diagram showing a schematic configuration of a control system for smart entry according to an embodiment of the present invention. Referring to FIG. 1, a control system 100 according to the present invention includes a vehicle, an RSE, and a traffic light on which an OBU is mounted.

The OBU sends its location information and RSE requested information to the RSE at regular intervals. RSE collects the information transmitted by the OBU. RSE is capable of wireless communication with roadside vehicles and is capable of generating and distributing information on its own.

According to Fig. 1, entrance roads are shown by entering main roads and main roads. Vehicles on the approach road enter the main road, which causes bottlenecks on the main road. This is because the number of bottlenecks varies depending on the number of vehicles traveling on the main road or the number of vehicles traveling on the main road from the entry road.

In the existing access control method, signal display is set within a predetermined period of time using aggregated traffic data collected from a detector of the main line, and an entry signal is operated using the determined entry rate. When the signal display is set at a fixed period and the collected and collected data are used in the same time period as the cycle, due to the characteristics of data collection and signal operating methods, It is difficult to respond quickly to the change of speed of the main road. Stagnation often occurs.

In contrast to this, the present invention proposes a method of controlling the entrance signal operation so as to maintain the speed of the merging section in order to mitigate the speed drop phenomenon at the merging section due to the entry of the traffic volume on the main road.

According to the present invention, a speed variable that can be directly collected from vehicles running on the main line in real time, responds promptly to traffic situation changes, and is easy to process is set as a traffic variable that can represent the traffic situation of the main line.

(Xt), which is a criterion for the traffic situation in which the vehicle can not enter the main road from the ramp installed on the entry road, and the entry threshold value (Xb), which is the reference value judged to be possible to enter the entrance traffic volume on the main road do. The entryable threshold value is the minimum required speed to introduce incoming traffic to the main line. In the context of the present invention, the Xt and Xb values are used as reference values for determining signal display and are compared with the speed data collected at the merging unit to control the incoming signal so that the merging unit speed is not lower than the target sustaining speed. In the present invention, it is assumed that Xt is set to 50 km / h and Xb is set to 60 km / h.

FIG. 2 is a conceptual diagram of signal operation for entry control for maintaining a merging part speed according to an embodiment of the present invention. The mean speeds collected from the smart vehicles in the confluence are used for speed estimation using the moving average method and the signal display is determined by comparing the predicted speed with the signal operating reference value. The minimum sustain threshold value and the entry threshold value, which are used as a reference for determining the green signal and the red signal display after the set time, are different according to the decreasing direction of the merging part speed and the increasing direction.

Table 1 shows an example of signal presentation assignment according to the average speed of the merging section smart vehicle.

  Signal operating reference value (example) - Minimum retention threshold (Xt): 50
- Entry threshold (Xb): 65 - Upper Operating Limit (UB): 80
- Lower bound of operating area (LB): 30 time Joining subsidiary figure
(VMS_EST) Speed and
Threshold comparison Comparison result Seonghyun City Remarks t 65 (initial) VMS_EST: Xt
65: 50 VMS_EST> Xt Green Since the confluence speed is greater than Xt, t + 3 58 (decrease) VMS_EST: Xt
58: 50 VMS_EST> Xt Green Since the confluence speed is greater than Xt, t + 6 45 (decrease) VMS_EST: Xt
45: 50 VMS_EST <Xt Red Since the convergence speed is smaller than Xt while the speed is decreasing, t + 9 40 (decrease) VMS_EST: Xt
40: 50 VMS_EST <Xt Red Since the confluence speed is less than Xt, t + 12 25 (decrease) VMS_EST: LB
25: 30 VMS_EST <LB Minimum entry rate
operation Operate according to the minimum entry rate for 1 minute since the junction speed is less than LB 1 minute minimum entry t + 72 45 VMS_EST: Xt
45: 50 VMS_EST <Xt Red Since the confluence speed is less than Xt, t + 75 52 (increase) VMS_EST: Xt
52: 50
VMS_EST: Xb
52: 65 VMS_EST> Xt
VMS_EST <Xb Red Since the confluence speed is greater than Xt but less than Xb in the increasing state, t + 78 67 (increase) VMS_EST: Xb
67: 65 VMS_EST> Xb Green Since the confluence speed is greater than Xb, t + 81 72 (increase) VMS_EST: Xb
72: 65 VMS_EST> Xb Green Since the confluence speed is greater than Xb, t + 84 82 (increase) VMS_EST: UB
82: 80 VMS_EST> UB Maximum entry rate
operation Because the speed of merging part is larger than UB, operation according to maximum entry rate for 1 minute 1-minute maximum entry

As shown in Table 1, at time t and at time t + 3 seconds, the speed of the previous time interval is higher than the minimum maintenance threshold. Therefore, the signal remains green when compared with Xt, and the speed becomes lower than Xt at t + 6 seconds The signal is changed to red display. In the situation where the speed increases at t + 75 seconds, the red signal is maintained because it is smaller than the entry threshold value for assigning the green display even when the situation is higher than Xt, and the speed becomes higher than Xb at t + 78 seconds, The signal is changed.

The speed prediction predicts the speed of the merging portion after the next 3 seconds by the moving average method on four successive speed values collected over 12 seconds every 3 seconds.

Table 2 below shows the conditions for applying the process shown in FIG.

Item Condition Car width 3.5m Number of cars Main line One way third lane Connection route Primary Line length Entrance
standard Upstream section: 690m Confluence section: 250m Downstream: 258m Incoming connection length 242m Input traffic volume Main line 3,000 ~ 5,000 units / hour Connection route 800 cars / hour Mainline speed limit 120 km / h (variance: 10 km / h) Connection speed limit 50 km / h (variance: 10 km / h) Vehicle composition ratio car 90% (smart vehicles 70%) Middle vehicle 10% (bus) Analysis time 3600 seconds ALINEA
Algorithm parameters Target Occ 0.20 kr 70 Minimum Metering Rate 200 Maximum Metering Rate 900 Vehicle tracking model Freeway - Wiedemann Car-Following Model 99

FIG. 3 illustrates an entry control process for maintaining a merging portion speed according to an embodiment of the present invention. Hereinafter, an entry control process for the convergence speed control according to an embodiment of the present invention will be described in detail with reference to FIG.

In the first stage, the speed data of the smart vehicles of the main line merger are collected. At the simulation time T, we run the junction of the main line and collect speed data of the smart vehicles.

In Step 2, we use the moving average method to predict the merging velocity at T + 3 seconds. Using the velocity data of the merged smart cars collected at time T, the moving average method predicts the speed of the merged part smart cars at T + 3 seconds. And judges whether the speed of the collected merging smart vehicles is in the operating area range. In the context of the present invention, the operating range is from 20 km / h to 90 km / h. In the case of the operation area, the process moves to step 3-1. If the operation area is not the operation area, the process moves to step 3-2.

And the display of the incoming signal is set using the merged sub-smart vehicle speed predicted in step 3-1. The predicted convergence speeds of the smart vehicles are compared with the minimum maintenance threshold to determine signal presentation and then move to step 4.

In step 3-2, the signal is operated by the minimum and maximum entry rates. Because the traffic situation is outside the operation area of Smart Entry Control, operate the signal display according to the minimum or maximum entry rate for 1 minute. If the merging part speed is below the lower operating limit, the operation is performed according to the minimum entry ratio (step 5-1). If the merging part speed is below the operational upper limit, operation according to the maximum entry ratio (step 5-2) is performed.

In step 4, set the display of the incoming signal. Change the signal indication by the signal local decision algorithm and go to step 6.

In step 5-1, signal operation according to the minimum entry rate is performed. Carries out signal operation for entering four vehicles for one minute to the main line and moves to zero level.

In step 5-2, signal operation according to the maximum entry rate is performed. Carries out signal operation to enter 15 vehicles for 1 minute to the main line and moves to 0 stage.

In step 6, the logging and predictive parameters are adjusted. The predicted parameters to be used at the next time are adjusted by comparing the speeds of the smart vehicles predicted by the moving average method at the time T and the speeds of the merging submersibles collected at the time T + 3 seconds.

In step 0, the speed predicting parameter is set and it returns to the first step. In other words, the prediction parameters are adjusted in accordance with the speed prediction result, and the process returns to the first step.

FIG. 4 shows experimental results according to the process proposed in FIG. As shown in FIG. 4, it can be seen that the speed of the main traffic volume is improved in comparison with the existing ALINEA algorithm. Particularly, FIG. 4 shows a case where the main traffic volume is 4250 cars per hour.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the scope of the present invention .

Claims (6)

A method of controlling a signal lamp for determining whether a vehicle entering a main road from the merging road enters an intersection comprising an intersection consisting of a main road and a main road,
Receiving the speed of the vehicle traveling on the main road at regular time intervals, and calculating an average speed of the received vehicle;
Comparing the calculated average speed with a minimum maintenance threshold value permitting vehicle entry into the main road on the merging road;
And controls the signal lamp to enter the vehicle on the main road from the merging road if the average speed is greater than the minimum maintenance threshold, and when the average speed is less than the minimum maintenance threshold, And controlling the signal lamp so as to block the entrance of the entrance.
2. The method of claim 1, wherein calculating the average speed of the vehicle comprises:
Wherein the average speed of the vehicle is calculated using at least four vehicle speeds received at predetermined time intervals.
3. The method of claim 2, wherein after calculating the average speed of the received vehicle,
And comparing whether the calculated average speed is included in the speed range required for the traffic light control.
A method of controlling a signal lamp for determining whether a vehicle entering a main road from the merging road enters an intersection comprising an intersection consisting of a main road and a main road,
Receiving the speed of the vehicle traveling on the main road at regular time intervals, and calculating an average speed of the received vehicle;
Comparing whether the calculated average speed is included in the speed range required for the traffic light control;
Comparing the average speed with a minimum maintenance threshold value permitting vehicle entry into the main road on the merging road if the calculated average speed is within the speed range;
And controls the signal lamp to enter the vehicle on the main road from the merging road if the average speed is greater than the minimum maintenance threshold, and when the average speed is smaller than the minimum maintenance threshold, And controlling the signal lamp so as to block the entrance of the entrance.
5. The method according to claim 4, wherein if the calculated average speed is not included in the speed range required for the traffic light control,
Calculating a difference between the average speed and a minimum value or a maximum value of the speed range;
And the number of vehicles entering the road along the main road at the merging road is changed according to the calculated difference.
6. The method of claim 5, wherein calculating the average speed of the vehicle further comprises:
Wherein the average speed of the vehicle is calculated using at least four vehicle speeds received at predetermined time intervals.

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