CN107393320B - Detector layout method for preventing vehicle queue overflow and giving priority to modern tramcars - Google Patents
Detector layout method for preventing vehicle queue overflow and giving priority to modern tramcars Download PDFInfo
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- CN107393320B CN107393320B CN201710580678.5A CN201710580678A CN107393320B CN 107393320 B CN107393320 B CN 107393320B CN 201710580678 A CN201710580678 A CN 201710580678A CN 107393320 B CN107393320 B CN 107393320B
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Abstract
The invention discloses a detector layout method for preventing a modern tramcar from overflowing in a queue, which mainly comprises the following steps: 11) collecting traffic operation parameters and signal timing parameters of an intersection; 12) calculating the minimum period duration; 13) determining the layout position of a modern tramcar direction detector; 14) determining the position of a queuing detector on a road with a direction different from the direction of the modern tramcar running; the invention effectively solves the problems that the prior traffic strategy at the intersection of the modern tramcar adopts two active prior control strategies and passive prior control strategies, the two control strategies do not detect the vehicle queuing state of the road in the direction different from the traveling direction of the modern tramcar when the traffic volume is large in the peak period, the modern tramcar is given priority directly, the vehicles in other directions are queued too long, the phenomenon of queuing overflow occurs, and the traffic jam is caused.
Description
Technical Field
The invention relates to the technical field of intersection signal control in the intelligent traffic technology, in particular to a detector layout method for preventing vehicle queue overflow and giving priority to modern tramcars.
Background
Modern trams are public transport modes upgraded on the basis of traditional trams, and have larger transport capacity and more environment-friendly and energy-saving transport means compared with buses. In recent years, modern tramcars in China are rapidly developed, and modern tramcars in Beijing, Shanghai, Shenyang, Suzhou, Huaian, Wuhan, Zhuhai and the like are built into a tramcar nowadays. By 2020, modern tram line planning exceeds 150, the total planned mileage exceeds 2500km, and the total investment exceeds 3000 billion yuan.
As a ground rail public transportation mode, the modern tramcar is one of main measures for ensuring the running efficiency and improving the service level by leading the modern tramcar to pass through an intersection preferentially. At present, the prior crossing priority traffic strategy for modern tramcars is generally divided into an active priority control strategy and a passive priority control strategy, wherein the active priority control strategy is a priority control scheme based on a tramcar direction detector and is generally applied; the latter is a timing control scheme. However, when the traffic volume is large in the peak period, the queuing states of vehicles in different directions driven by a non-modern tramcar are not detected, the modern tramcar is given priority directly, and the phenomenon that vehicles queue too long in other directions, especially short-distance intersection vehicles can wait for a short distance, queue overflow occurs, and traffic jam is caused to generate chain reaction. Therefore, in view of the above situation, the present invention provides a modern tram-prioritized detector layout method for preventing vehicle queue overflow.
Disclosure of Invention
The invention provides a layout method of a modern tramcar priority detector for preventing vehicle queue overflow, which effectively solves the problem of traffic jam caused by the phenomenon that the modern tramcar queues too long and queues overflow due to the fact that an active priority control strategy and a passive priority control strategy are adopted by an intersection priority traffic strategy of the modern tramcar, and the two control strategies do not detect the vehicle queue states of non-modern tramcar running in different directions when the traffic volume is large in a peak period, so that the modern tramcar is given priority directly.
The invention is realized by the following technical scheme:
a modern tram prioritized detector layout method for preventing vehicle queue overflow, characterized by: the layout method mainly comprises the following steps:
11) collecting traffic operation parameters and signal timing parameters of an intersection, including modern tramcar parameters, vehicle operation parameters, pedestrian street crossing parameters and intersection signal timing parameters;
12) calculating the minimum period duration, executing the minimum signal period to reduce the waiting time when the modern tramcar waits at the intersection, and calculating the minimum green light time and the minimum signal period duration according to the pedestrian crossing parameters and the green light interval time;
13) determining the layout position of a modern tram direction detector, comprising an upstream detector, an upstream trigger detector and a downstream detector: calculating the position of an upstream detector in the running direction of the tramcar according to the running speed of the tramcar and the minimum period duration; calculating the position of an upstream trigger detector in the running direction of the tramcar according to the length and the deceleration of the tramcar; determining the position of a downstream detector according to the length of the tramcar;
14) determining the position of a queuing detector on a road in a direction different from the running direction of the modern tramcar, and calculating the position of the queuing detector according to the traffic of a peak at an entrance road for 15min, the traffic volume at a peak hour, the distance between the car heads and the number of lanes.
The invention further adopts the technical improvement scheme that:
the scheme for acquiring the traffic operation parameters and the signal timing parameters of the intersection in the step 11) comprises the following steps:
21) collecting modern tramcar parameters including the length, running speed and acceleration and deceleration at a crossing;
22) collecting vehicle operation parameters including peak hour traffic volume, peak hour 15min traffic volume and vehicle head distance;
23) acquiring pedestrian crossing lengths and pedestrian crossing walking speeds of different phases in a signal timing scheme;
24) the intersection signal timing scheme is collected and comprises signal cycle time, yellow light time and minimum green light interval time, wherein the minimum green light interval time is the sum of the yellow light time.
The invention further adopts the technical improvement scheme that:
the step 12) of calculating the minimum cycle duration includes the steps of:
31) and calculating the minimum green time of the i phase according to the following calculation formula:
wherein DiFor i-phase pedestrian delay or left-turn vehicle delay, WiDistance of a pedestrian or vehicle passing through the intersection is i phase, v is speed of the pedestrian or vehicle, YiI phase green interval time;
32) and calculating the minimum period duration according to the following calculation formula:
wherein C isminIs the minimum cycle duration, YiFor i-phase green interval, GiminI-phase minimum green time.
The invention further adopts the technical improvement scheme that:
the step 13) of determining the layout position of the modern tramcar direction detector comprises the following steps:
41) the upstream detector position is determined, which is calculated as follows: l is1＝v·Cmin，
In the formula, L1The distance between the position of the upstream detector and the stop line of the intersection is shown, and v is the running speed of the modern tramcar;
42) determining the upstream trigger detector position by the following calculation formula: l is2Is L + A, wherein L2The distance between the position where the upstream trigger detector is placed and the stop line of the intersection is set as L, the length of the tramcar is set as L, the safe braking distance of the modern tramcar is set as A, and the distance is set as v2The a is the deceleration of the tramcar;
43) determining a downstream detection position, wherein the calculation formula is as follows: l is3Is L, wherein L3The distance between the position of the downstream detector of the tramcar passing through the intersection and the stop line of the entrance lane is equal to the distance between the position of the downstream detector of the intersection and the stop line of the entrance lane.
The invention further adopts the technical improvement scheme that:
said step 14) determines the position of the queuing detector on the road different from the road on which the modern tram runs, and the calculation formula is as follows:
in the formula, L4The method is characterized in that the position of a vehicle queuing detector at an entrance lane of a road intersection in a direction different from that of a tramcar, w is the longest signal cycle number which can be waited by a driver, 1.5 is generally taken as w, C is the time length of an original signal cycle, q is the time length of a signal cycle, andmax(PHF15) The maximum flow rate corresponding to the 15min peak flow rate of the inlet channel,
the distance between the car heads is shown, N is the number of lanes at the entrance of a road intersection in the direction different from that of the tramcar, and a schematic diagram of the position of a downstream detector is shown in figure 1.
Compared with the prior art, the invention has the following obvious advantages:
according to a modern tramcar priority strategy, in order to ensure that the time for waiting for red light can be reduced when the modern tramcar passes through an intersection, an upstream detector (the placement distance does not exceed that of the next intersection) is arranged at the upstream distance of the intersection where the modern tramcar runs for a minimum cycle time (including parking time), whether the signal phase of the current intersection needs to be adjusted is detected, the modern tramcar can smoothly pass through the intersection, a calculation method of the position of the upstream detector is established, and the position of the upstream detector is determined;
secondly, considering the instability of the speed of the modern tramcar and the randomness of the stop time, an upstream trigger detector is arranged at a position close to the upstream of the intersection, when the detector detects the modern tramcar, the signal phase is adjusted in a small amplitude, the upstream trigger detector is arranged, and a position calculation method is established, so that the position of the upstream trigger detector is determined;
thirdly, the invention considers the event that the queue of the vehicles on the road in different directions is too long or even overflows caused by the active priority of the modern tramcar, sets a vehicle queue detector, adjusts the signal lamp in real time when detecting that the queue of the vehicles is too long, improves the service level of the intersection, and prevents the traffic paralysis of the upstream intersection caused by the queue overflow of the vehicles on the road in different directions from the running direction of the modern tramcar.
Drawings
FIG. 1 is a schematic view of the intersection detector placement of the present invention;
in the figure, A is an upstream detector, B is an upstream trigger detector, C is a downstream detector, D is a queue detector, L1Distance of upstream detector from intersection stop line, L2Distance of the upstream trigger detector from the intersection stop line, L3Distance of downstream detector from intersection stop line, L4The distance of the queue detector from the intersection stop line.
FIG. 2 is an exemplary intersection timing diagram of the method of the present invention.
Detailed Description
So that the manner in which the above recited features of the present invention can be understood and appreciated in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings, which are not intended to limit the scope of the invention, but rather, to be construed as limiting the scope of the invention, which are appended claims, as follows:
as shown in FIG. 1, the detector layout method of the present invention comprises the following steps:
1. collecting traffic operation parameters and signal timing parameters of intersection
Collecting traffic operation parameters and signal timing parameters of an intersection, including modern tramcar parameters, vehicle operation parameters, pedestrian street crossing parameters and intersection signal timing parameters, particularly collecting the modern tramcar parameters, including the length of the modern tramcar, the operation speed and the acceleration and deceleration at the intersection; collecting vehicle operation parameters including peak hour traffic volume, peak hour 15min traffic volume and vehicle head distance; acquiring pedestrian crossing lengths and pedestrian crossing walking speeds of different phases in a signal timing scheme; the intersection signal timing scheme is collected and comprises signal cycle time, yellow light time and minimum green light interval time, wherein the minimum green light interval time is the sum of the yellow light time.
The above data can be obtained by field data investigation and modern tram operating companies.
In the embodiment, an east road-traffic road intersection in the east of Huai-Hai city of Huai-an province of Jiangsu province is taken as an example, the phase distribution of the intersection is shown in table 1, and a signal timing diagram is shown in fig. 2.
TABLE 1 phase distribution at crossings
The length of the modern tramcar is 30m, the pedestrian crossing is delayed for 3s, the left turning of the tramcar is delayed for 2s, the green light interval time of four phases is 3s, the travel speed of the modern tramcar is 19km/h (5.28m/s), the time point speed of the tramcar is 16km/h (4.44m/s) during braking, and the deceleration is 2m/s2The length of the crossing of the pedestrian in the north-south direction is 23m, the length of the crossing of the pedestrian in the east-west direction is 25m, the length of the crossing in the left turn is 28m, the walking speed of the pedestrian is 1.2m/s, the left turn speed of the vehicle is 2.8m/s, the period duration of the original signal is 155s, qmax(PHF15) 1765veh/h, the distance between the vehicle heads is 5m/veh, the longest signal cycle number which can be waited by a driver is 1.5, and the number of the crossing approach roads in the east-west direction is 4.
2. The calculation of the minimum cycle duration comprises the following steps:
and calculating the minimum green time of the i phase according to the following calculation formula:
wherein DiFor i-phase pedestrian delay or left-turn vehicle delay, WiDistance of a pedestrian or vehicle passing through the intersection is i phase, v is speed of the pedestrian or vehicle, YiI-phase green interval. In this example, for the first phase and the third phase of the straight-going vehicle, the pedestrian crosses the street, and the minimum green time calculation parameter is the parameter corresponding to the pedestrian walking; and for the second phase and the fourth phase special for the left turn of the vehicle, no pedestrian crosses the street, and the left turn vehicle driving parameter is taken as the minimum green light time calculation parameter. Minimum green time for north-south straight travel in first phase:
second phase south-north left-turn minimum green time:
third phase east-west straight going minimum green time:
the minimum green time of the south-north left turn of the fourth phase:
and calculating the minimum period duration according to the following calculation formula:
wherein C isminIs the minimum cycle duration, YiFor i-phase green interval, GiminFor i-phase minimum green time, in this example
3. Determining upstream detector position
The upstream detector plays the most essential role for the prior passing of the modern tram intersection, and when the detector detects the passing of the modern tram, a prior passing signal is given. The calculation formula is as follows:
L1＝v·Cmin，
in the formula, L1Is the distance between the upstream detector position and the intersection stop line, v is the travel speed of a modern tram, L in this example1＝v·Cmin＝5.28×70＝369.6m。
4. Determining upstream trigger detector position
Considering the instability of the speed of the modern tramcar and the randomness of the stop time, an upstream trigger detector is arranged at a position close to the upstream of the intersection, the function of the upstream trigger detector is to perform secondary adjustment on the signal phase, the modern tramcar is guaranteed to pass through the intersection preferentially, and the calculation formula is as follows:
L2＝L+A，
in the formula, L2The distance between the position where the upstream trigger detector is placed and the stop line of the intersection is set as L, the length of the tramcar is set as L, the safe braking distance of the modern tramcar is set as A, and the distance is set as va 2/2a，VaThe point speed when the tramcar starts to brake is shown as a tramcar deceleration, in the example, A is equal to va 2/2a＝4.4422 × 2 ═ 4.9m, then L2＝L+A＝30+4.9＝34.9m。
5. Determining downstream detection locations
The downstream detector is arranged to judge whether the modern tramcar passes through the intersection, and the calculation formula is as follows: l is3Is L, wherein L3The distance between the position of the downstream detector of the tramcar passing through the intersection and the stop line of the entrance lane is L in the example3＝L＝30m。
6. Queue detector location
The calculation formula is as follows:
in the formula, L4The method is characterized in that the position of a vehicle queuing detector at an entrance lane of a road intersection in a direction different from that of a tramcar, w is the longest signal cycle number which can be waited by a driver, 1.5 is generally taken as w, C is the time length of an original signal cycle, q is the time length of a signal cycle, andmax(PHF15): the maximum flow rate corresponding to the 15min peak flow rate of the inlet channel,
the distance between the car heads is, N is the number of the lanes at the entrance of the intersection of the road in the same direction as the tramcar, in the example
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
Claims (3)
1. A modern tram prioritized detector layout method for preventing vehicle queue overflow, characterized by: the layout method mainly comprises the following steps:
11) collecting traffic operation parameters and signal timing parameters of an intersection, including modern tramcar parameters, vehicle operation parameters, pedestrian street crossing parameters and intersection signal timing parameters;
12) calculating the minimum period duration, executing the minimum signal period to reduce the waiting time when the modern tramcar waits at the intersection, and calculating the minimum green light time and the minimum signal period duration according to the pedestrian crossing parameters and the green light interval time;
13) determining the layout position of a modern tram direction detector, comprising an upstream detector, an upstream trigger detector and a downstream detector: calculating the position of an upstream detector in the running direction of the tramcar according to the running speed of the tramcar and the minimum period duration; calculating the position of an upstream trigger detector in the running direction of the tramcar according to the length and the deceleration of the tramcar; determining the position of a downstream detector according to the length of the tramcar;
14) determining the position of a queuing detector on a road in a direction different from the running direction of a modern tramcar, and calculating the position of the queuing detector according to the 15min flow of the inlet road peak, the traffic volume at the peak hour, the distance between the car heads and the number of lanes;
the step 12) of calculating the minimum cycle duration includes the steps of:
31) and calculating the minimum green time of the i phase according to the following calculation formula:
wherein DiFor i-phase pedestrian delay or left-turn vehicle delay, WiDistance of a pedestrian or vehicle passing through the intersection is i phase, v is speed of the pedestrian or vehicle, YiI phase green interval time;
32) and calculating the minimum period duration according to the following calculation formula:
wherein C isminIs the minimum cycle duration, YiFor i-phase green interval, Gi minI phase minimum green time;
the step 13) of determining the layout position of the modern tramcar direction detector comprises the following steps:
41) the upstream detector position is determined, which is calculated as follows: l is1＝V·L1＝V·Cmin，
In the formula, L1The distance between the position of the upstream detector and a stop line of the intersection is shown, and V is the running speed of the modern tramcar;
42) determining the upstream trigger detector position by the following calculation formula: l is2Is L + A, wherein L2The distance between the position where the upstream trigger detector is placed and the stop line of the intersection is equal to V, L is the length of the tramcar, A is the safe braking distance of the modern tramcar, and A is equal to V2The a is the deceleration of the tramcar;
43) determining a downstream detection position, wherein the calculation formula is as follows: l is3Is L, wherein L3The distance between the position of the downstream detector of the tramcar passing through the intersection and the stop line of the entrance lane is equal to the distance between the position of the downstream detector of the intersection and the stop line of the entrance lane.
2. A modern tram-prioritized detector layout method for preventing vehicle in-line overflow according to claim 1, characterized in that: the scheme for acquiring the traffic operation parameters and the signal timing parameters of the intersection in the step 11) comprises the following steps:
21) collecting modern tramcar parameters including the length, running speed and acceleration and deceleration at a crossing;
22) collecting vehicle operation parameters including peak hour traffic volume, peak hour 15min traffic volume and vehicle head distance;
23) acquiring pedestrian crossing lengths and pedestrian crossing walking speeds of different phases in a signal timing scheme;
24) the intersection signal timing scheme is collected and comprises signal cycle time, yellow light time and minimum green light interval time, wherein the minimum green light interval time is the sum of the yellow light time.
3. A modern tram-prioritized detector layout method for preventing vehicle in-line overflow according to claim 1 or 2, characterized in that: said step 14) determines the position of the queuing detector on the road different from the road on which the modern tram runs, and the calculation formula is as follows:
in the formula, L4The position of a vehicle queuing detector at the entrance of a road intersection in a direction different from that of the tramcar, w is the longest signal cycle number which can be waited by a driver, C is the time length of an original signal cycle, q is the time length of the original signal cyclemax(PHF15) The maximum flow rate corresponding to the 15min peak flow rate of the inlet channel,
the distance between the car heads is N, and N is the number of lanes at the entrance of the road intersection in the direction different from that of the tramcar.
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| CN110335475B (en) * | 2019-06-28 | 2020-07-14 | 东南大学 | Induction control method and system for intersection signal lamp of compound-line common-rail tramcar |
| CN111882895A (en) * | 2020-06-24 | 2020-11-03 | 淮阴工学院 | Intersection delay determination method used under modern tramcar signal priority control |
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