WO2018090997A1

WO2018090997A1 - Intersection phase time allocation method based on passing demand balance

Info

Publication number: WO2018090997A1
Application number: PCT/CN2017/112104
Authority: WO
Inventors: 卢凯; 林观荣; 胡建伟; 徐建闽
Original assignee: 华南理工大学
Priority date: 2016-11-21
Filing date: 2017-11-21
Publication date: 2018-05-24
Also published as: CN106408957A; CN106408957B

Abstract

An intersection phase time allocation method based on passing demand balance, comprising the following steps: 1) listing all traffic stream combinations the total time durations of which are known and a passing time of which is to be allocated; 2) calculating the shortest passing time required by each of the traffic stream combinations in step 1); 3) calculating a quotient value between the total time duration and the shortest passing time of each of the traffic stream combinations; 4) selecting a traffic stream combination with the minimum quotient value, and allocating a passing time and a phase time; and 5) determining whether the passing time of all the traffic streams is determined, and if so, the allocation of an intersection phase time being completed, and if not, returning to step 1), and entering the next round of allocation of a passing time and a phase time of a traffic stream. In the method, the passing demand of all critical traffic streams and non-critical traffic streams, and of dependent-phase traffic streams and cross-phase traffic streams are taken full consideration. A programmed intersection signal phase time allocating method is provided. A passing time of the cross-phase traffic streams and the non-critical traffic streams is optimised.

Description

Intersection phase time allocation method based on traffic demand balance

Technical field

The invention relates to the field of traffic signal control, in particular to an intersection phase time allocation method based on the balance of traffic demand.

Background technique

The phase time is the key parameter to be determined when designing the signal timing of a single intersection. The value of the phase is crucial for preventing traffic congestion on the road section and reducing the delay of the intersection parking. The greater the phase time of a certain signal, the more favorable the passage of the signal phase vehicle, but at the same time it will be detrimental to the passage of other signal phase vehicles.

When the minimum delay time of the key traffic flow at the intersection is the minimum phase time allocation principle, the saturation of each key traffic should be approximately equal and the total saturation of the intersection should be minimized. The phase time of each signal should be based on its key traffic flow. More than proportional distribution; when meeting the demand for key vehicles in the intersection as the phase time allocation principle, the phase time allocation will be based on the saturation practical limit of each key traffic at the intersection, and the phase time of each signal should be based on The minimum green letter required for a critical traffic flow is distributed proportionally.

At present, the design of phase time distribution schemes for intersection signals mostly focuses on the consideration of the traffic efficiency of key traffic and independent phase traffic, and often adopts a direct decomposition or superposition distribution method, which neglects the traffic demand of non-critical traffic and cross-phase traffic. Therefore, from the perspective of the operational benefits of the entire intersection, it is not possible to meet the global optimization requirements for the signal timing of the intersection.

Summary of the invention

The technical problem to be solved by the present invention is to provide an intersection phase time allocation method based on the balance of traffic demand, and comprehensively consider the key traffic flow and the non-critical traffic flow and the independent phase traffic flow according to the minimum transit time required for each traffic flow at the intersection. With the traffic demand of cross-phase traffic, the overall traffic efficiency of the intersection is better improved.

To solve the above technical problem, the present invention provides the following technical solution: an intersection phase time allocation method based on the balance of the demand, comprising the following steps:

S1, listing all traffic flow combinations whose total duration is known and the transit time is to be allocated;

S2. Calculate the minimum transit time required for each traffic flow combination in step S1;

S3. Calculate a quotient between the total duration of each vehicle flow combination and the shortest transit time;

S4: selecting a traffic flow combination with the smallest quotient value, and performing the distribution of the transit time and the phase time;

S5. Determine whether the transit time of all the traffic flows has been determined. If yes, the intersection phase time is allocated; if not, return to step S1 to enter the next round of traffic flow time and phase time allocation.

Further, in the step S1, in the first round of the vehicle flow line time and phase time allocation, since only the signal period duration is known, it is only necessary to list all the vehicle flow combinations constituting one signal period; In the vehicle flow line time and phase time allocation, there will be a traffic flow combination whose total duration is the signal period or the known phase time and the transit time to be allocated.

Further, the minimum transit time required for the traffic flow combination in the step S2 is obtained by adding the minimum transit time required for each traffic flow, and the minimum transit time required for each respective traffic flow is determined in advance by its respective traffic demand.

Further, the size of the quotient in the step S3 reflects the supply-demand ratio of the traffic flow, and the smaller the supply-demand ratio, the more preferential the traffic time is allocated.

Further, in the step S4, the transit time of each car flow will be proportionally allocated according to the required minimum transit time, and when the transit time of each car flow is determined, the corresponding phase time is also determined.

Further, in the step S5, if there is one or more cross-phase traffic, the distribution of the current time of the current vehicle will determine a plurality of phase times and the time and the time of the next round of the vehicle may be In the allocation, the vehicle flow combination to be allocated is determined to determine the transit time described in step S1.

After adopting the above technical solution, the present invention has at least the following beneficial effects:

1. The phase time distribution scheme of the intersection signal obtained by the method can meet the traffic demand of all key traffic and non-critical traffic, independent phase traffic and cross-phase traffic.

2. This method realizes the optimization of the transit time of the cross-phase traffic flow and the non-critical traffic flow by multi-round optimization of the phase time, which effectively improves the overall traffic efficiency of the intersection.

3. This method gives a programmed phase intersection time signal distribution method, which makes the phase time distribution scheme of the intersection signal more reasonable, scientific and standardized.

DRAWINGS

1 is a flow of steps of an intersection phase time allocation method based on traffic demand balance according to the present invention; Cheng Tu

2 is a diagram showing the correspondence between signal phase and traffic flow of an intersection in an embodiment of an intersection phase time allocation method based on a demand demand balance according to the present invention.

detailed description

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Example

An intersection uses a three-phase signal control method for 6-vehicle traffic, in which traffic 1 obtains the right of way in phase 1 and phase 2, traffic 2 obtains the right of way in phase 1, and traffic 3 and traffic 4 obtain the right of right in phase 2, traffic 5 The traffic rights are obtained in phase 3 and phase 1, and the traffic flow 6 obtains the traffic rights in phase 3. The correspondence between the signal phase and the traffic flow is as shown in FIG. 2. It is known that the signal period duration is C=120s, and the minimum transit times required for traffic flows 1, 2, 3, 4, 5, and 6 are t _min1 =58s, t _min2 =12s, t _min3 =36s, t _min4 =30s,t _{_{min5 = 72s, t min6 = 48s}} .

As shown in FIG. 1, the embodiment includes the following implementation steps:

Step 1 (first round): List all traffic combinations whose total duration is known and the transit time is to be assigned.

In the first round of vehicle travel time and phase time allocation, since only the signal period duration is known, it is only necessary to list all the traffic combinations that constitute one signal period. All traffic combinations whose total duration is known and the transit time is to be allocated include {1, 6}, {2, 3, 6}, {2, 4, 6}, {3, 5}, {4, 5}.

Step 2 (first round): Calculate the minimum transit time required for each traffic combination in step 1.

The minimum transit time required for the traffic flow combination {1,6} is t _min1 +t _min6 =58+48=106s, and the minimum transit time required for the traffic flow combination {2,3,6} is t _min2 +t _min3 +t _min6 =12+36+48=96s, the minimum transit time required for traffic flow combination {2,4,6} is t _min2 +t _min4 +t _min6 =12+30+48=90s, traffic flow combination {3,5} The minimum transit time required is t _min3 +t _min5 =36+72=108s, and the minimum transit time required for the traffic flow combination {4,5} is t _min4 +t _min5 =30+72=102s.

Step 3 (first round): Calculate the quotient between the total duration and the shortest transit time of each traffic combination.

The quotient between the total duration of the traffic flow combination {1,6}, {2,3,6}, {2,4,6}, {3,5}, {4,5} and the shortest transit time is 1.132 respectively. 1,250, 1.333, 1.111, 1.176.

Step 4 (first round): Select the traffic flow combination with the smallest quotient, allocate the transit time of the traffic contained in it, and determine the corresponding phase time.

Select the traffic flow combination {3, 5} with the lowest quotient in step 3, and allocate the transit time according to the minimum transit time required by traffic flow 3 and traffic flow 5, that is, the transit time of traffic flow 3.

Traffic time of traffic 5

It is determined that the duration of phase 2 is 40 s, and the total duration of phase 3 and phase 1 is 80 s. The transit time t _{4 of the} traffic flow 4 is t ₃ = 40 s.

Step 5 (first round): Determine whether the transit time of all traffic flows has been determined. If yes, the phase time of the intersection is allocated; if not, return to step 1 to enter the distribution of the traffic time and phase time of the next round. .

The current round determines the transit time of traffic flow 3, 4, and 5. The transit time of traffic flow 1, 2, and 6 is to be determined. It is necessary to return to step 1 to enter the distribution of the traffic time and phase time of the next round. In the allocation of the current cycle time of the vehicle, the total length of phase 3 and phase 1 is determined to be 80 s, which will be used in the distribution of the next cycle of the vehicle to determine the traffic flow to be allocated for the transit time.

Step 1 (second round): List all the traffic combinations whose total duration is known and the transit time is to be assigned.

In the second round of vehicle travel time and phase time allocation, there will be a combination of the total traffic duration for the signal period and the traffic time to be assigned for the phase 3 and phase 1 time. All traffic flow combinations whose total duration is known and the transit time is to be allocated include {1,6}, {2,6}, where the total duration is the signal period and the traffic flow to be allocated is {1,6}, and the total duration is The combination of phase 3 and phase 1 time and traffic time to be allocated is {2, 6}.

Step 2 (second round): Calculate the minimum transit time required for each traffic combination in step 1.

The minimum transit time required for traffic flow combination {1,6} is t _min1 +t _min6 =58+48=106s, and the minimum transit time required for traffic flow combination {2,6} is t _min2 +t _min6 =12+48= 60s.

Step 3 (second round): Calculate the quotient between the total duration and the shortest travel time of each traffic combination.

The quotient between the total duration of the traffic flow combination {1,6}, {2,6} and the shortest transit time is 1.132 and 1.333, respectively.

Step 4 (second round): Select the traffic flow combination with the smallest quotient value, allocate the transit time of the traffic flow it contains, and then determine the corresponding phase time.

Select the traffic flow combination {1,6} with the lowest quotient in step 3, and allocate the transit time according to the minimum transit time required by traffic flow 1 and traffic flow 6, that is, the transit time of traffic flow 1

Traffic time of traffic 6

It is determined that the phase 3 has a duration of 54 s and the phase 1 has a duration of 26 s. The traffic time 2 of the traffic flow 2 is t ₂ = t _{1 -} t ₃ = t _{5 -} t ₆ = _{26 s} .

Step 5 (second round): Determine whether the transit time of all traffic flows has been determined. If yes, the phase time of the intersection is allocated; if not, return to step 1 to enter the distribution of the traffic time and phase time of the next round. .

The current round determines the transit time of traffic 1, 2, and 6. The traffic time of all traffic has been determined. The traffic times of traffic 1, 2, 3, 4, 5, and 6 are 66, 26, 40, and 40 respectively. 80, 54, the phase time of the intersection is allocated, and the distribution times of the phases 1, 2, and 3 are respectively 26, 40, and 54.

The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the embodiments, and any other changes, modifications, substitutions, and combinations may be made without departing from the spirit and scope of the present invention. And simplifications, all of which are equivalent replacement means, are included in the scope of protection of the present invention.

Claims

An intersection phase time allocation method based on traffic demand balance, characterized in that it comprises the following steps:

S1, listing all traffic flow combinations whose total duration is known and the transit time is to be allocated;

S2. Calculate the minimum transit time required for each traffic flow combination in step S1;

S3. Calculate a quotient between the total duration of each vehicle flow combination and the shortest transit time;

S4: selecting a traffic flow combination with the smallest quotient value, and performing the distribution of the transit time and the phase time;

S5. Determine whether the transit time of all the traffic flows has been determined. If yes, the intersection phase time is allocated; if not, return to step S1 to enter the next round of traffic flow time and phase time allocation.
The intersection phase time allocation method based on the demand demand balance according to claim 1, wherein in the step S1, in the first round of the vehicle flow time and phase time allocation, since only the signal period duration It is known that it is only necessary to list all the traffic combinations that constitute one signal cycle; in the subsequent traffic time and phase time allocations of the vehicles, there will be a transit time with a total duration of signal period or known phase time and to be allocated. The combination of traffic flow.
The intersection phase time allocation method based on the demand demand balance according to claim 1, wherein the minimum transit time required for the traffic flow combination in the step S2 is added by the minimum transit time required for each traffic flow. It is obtained that the minimum transit time required for each of the vehicle flows is determined in advance by their respective traffic demands.
The intersection time phase allocation method based on the demand balance according to claim 1, wherein the size of the quotient in the step S3 reflects the supply-demand ratio of the traffic flow, and the smaller the supply-demand ratio is, the more the traffic flow needs to be. Priority is given to the distribution of transit time.
The intersection phase time allocation method based on the demand demand balance according to claim 1, wherein in the step S4, the transit time of each vehicle flow is proportionally allocated according to the required minimum transit time, and When the transit time of each vehicle flow is determined, the corresponding phase time is also determined.
The method for allocating phase time of an intersection based on the demand balance according to claim 1, wherein in the step S5, if one or more cross-phase traffic flows exist, the flow time of the current vehicle is allocated. A plurality of phase times will be determined, which may be used in the next round of vehicle flow line time allocation to determine the traffic flow to be assigned as described in step S1.