Coordinated Phase Difference Correction Method and System for Multi-System Signal Controllers

Abstract

The present invention discloses a method and system for correcting the coordination phase difference of multi-system signal controllers, belonging to the field of traffic technology. The method aims at the problem that there is a deviation between the phase difference of the green wave configuration and the actual operating phase difference caused by signal controllers with inconsistent reference lines for adjacent intersections within the same "green wave band" section. Taking the green wave reference line of the signal controller at one intersection as a reference, the phase difference of another intersection is calculated, and then according to the green wave reference line of another intersection and the signal cycle of the green wave scheme adopted within the "green wave band" section, the phase difference deviation value of another intersection is calculated, and further the actual phase difference of another intersection is calculated. According to the actual phase difference, the green wave reference line of another intersection is set, so as to complete the phase coordination of signal controllers of different systems within the "green wave band" section.

Description

Technical Field

[0001] The present invention relates to a method and system for correcting the coordinated phase difference of multi-system signal controllers, belonging to the field of traffic technology. Background Art

[0002] The green wave control of urban intersection signals generally refers to the coordinated control of traffic signals among several consecutive intersections on a main road. Vehicles traveling through the intersections under the coordinated control of the main road can avoid or encounter fewer red lights. This traffic signal coordinated control method is called "green wave band" control, and the several consecutive intersections are called "green wave band".

[0003] Setting up the green wave band has the following importance. First, it improves traffic efficiency, allowing vehicles traveling on the green wave coordinated control section to pass through each intersection in this section without encountering or encountering fewer red lights. Second, it enhances the driving experience. When drivers encounter red lights, traffic jams, and pedestrians and non-motor vehicles crossing the road, they have to stop, which will bring irritable driving emotions. The setting of the green wave band can reduce road rage, allowing for smooth driving with all green lights, and the refreshing driving experience makes drivers feel comfortable. Third, it improves travel punctuality. When drivers are accustomed to the green wave band, they can generally know the approximate time from the departure place to the destination, or even a relatively accurate time, which is convenient for everyone to estimate the travel time.

[0004] There are many domestic signal controller brands, and there is a phenomenon that the signal controller brands at adjacent intersections in a city are different. Signal controllers of different brands respectively adopt their own signal control algorithms, and there is no unified standard for the definition of the green wave baseline in the green wave control algorithm. For example, some manufacturers use the green wave baseline as 00:00:00, some manufacturers use the green wave baseline as 08:00:00, and some manufacturers use the start time of the multi-period plan as the green wave baseline. Due to different baselines, there is a deviation between the phase difference of the green wave configuration and the actual operating phase difference, and a green wave coordination plan for multiple systems cannot be realized. Summary of the Invention

[0005] In order to solve the problem that there is a deviation between the phase difference of the green wave configuration and the actual operating phase difference caused by the non-uniform baseline of signal controllers of different brands at present, the present invention provides a method for correcting the coordinated phase difference of multi-system signal controllers. This method is applied to the signal controllers at adjacent intersections within the same "green wave band" section. The signal controllers at the adjacent intersections adopt different green wave baselines. The method includes:

[0006] Taking the green wave reference line of the signal machine at one of the intersections as the standard, calculate the theoretical phase difference of another intersection, and then calculate the phase difference deviation value of the other intersection according to the green wave reference line of the other intersection and the signal cycle of the green wave scheme adopted within the "green wave band" section. Furthermore, calculate the actual phase difference of the other intersection, and set the signal machine of the other intersection according to the actual phase difference, so as to complete the phase coordination of the signal controllers of different systems within the "green wave band" section.

[0007] Optionally, assuming that two adjacent intersections within the "green wave band" section are intersection A and intersection B respectively, and the signal machines at the two intersections adopt different green wave reference lines, the method includes:

[0008] Step S1, define a green wave reference line as 00:00:00, and use 00:00:00 as the reference line for the coordinated phase difference of the multi-system signal controller; assume that the green wave reference line adopted by the signal machine at intersection A is 00:00:00, and the green wave reference line adopted by the intersection is a multi-period green wave scheme;

[0009] Step S2, calculate the phase difference of intersection B according to the distance between intersection A and intersection B

[0010] Step S3, set the start time of the multi-period green wave scheme at intersection B as T b , and calculate the phase difference deviation value r of intersection B according to the following formula:

[0011] r = t b / c

[0012] where, t b = hour(T b )×3600 + min(T b )×60, represents the value of the start time T of the multi-period green wave scheme at intersection B b converted to a value in seconds; c represents the unified signal cycle adopted for the coordinated green wave between intersection A and intersection B;

[0013] Step S4, calculate the actual phase difference of intersection B according to the following formula as

[0014]

[0015] Step S5, set the signal machine of intersection B according to the calculated actual phase difference of intersection B to complete the phase coordination of the signal controllers of different systems on the same section.

[0016] Optionally, the calculating the phase difference of intersection B according to the distance between intersection A and intersection B includes:

[0017]

[0018] Among them, d represents the distance between intersection A and intersection B, and v represents the green wave speed within the "green wave band" section where intersection A and intersection B are located.

[0019] Optionally, if the green wave reference line adopted by the signal machine at intersection A is a multi-period green wave scheme and the green wave reference line adopted by the signal machine at intersection B is 00:00:00, then the actual phase difference of the signal machine at intersection A is calculated according to steps S2 to S5 as follows And correspondingly set the signal machine at intersection A to complete the phase coordination of signal controllers of different systems on the same road section.

[0020] This application also provides a coordinated phase difference correction system for multi-system signal controllers. The system includes signal controllers with different green wave reference lines within the same "green wave band" section. The system uses the above method to correct the phase difference of signal controllers with different green wave reference lines at adjacent intersections within the same "green wave band" section.

[0021] The beneficial effects of the present invention are as follows:

[0022] Aiming at the problem that there is a deviation between the phase difference of the green wave configuration and the actual operating phase difference caused by signal controllers with inconsistent reference lines at adjacent intersections within the same "green wave band" section, the phase difference of another intersection is calculated based on the green wave reference line of the signal controller at one of the intersections, and then the phase difference deviation value of another intersection is calculated according to the green wave reference line of another intersection and the signal period of the green wave scheme adopted within the "green wave band" section, and further the actual phase difference of another intersection is calculated. The green wave reference line of another intersection is set according to the actual phase difference, so as to complete the phase coordination of signal controllers of different systems within the "green wave band" section. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 is a flowchart of a method for correcting the coordinated phase difference of a multi-system signal controller provided by the present invention.

[0025] Figure 2 is a schematic diagram of the position difference deviation value between adjacent intersections A and B in an embodiment of the present invention. Detailed Embodiments

[0026] At present, signal machines of the same brand are usually used as much as possible in the urban green wave control section, so that the green wave reference lines of each signal machine are consistent. For example, for three adjacent intersections A, B, and C on a certain section, if signal machines of the same brand are selected, only the corresponding phase differences need to be calculated according to the distances between A and B and between B and C, and the calculated phase differences are filled into the signal machines at the corresponding intersections to enable green wave control for this section. However, if for some other reasons, there are signal machines with inconsistent green wave reference lines in the same green wave control section, then the phase differences calculated according to the above conventional method cannot achieve green wave control. In view of this situation, the method proposed in this application can be used for phase correction so that signal machines with inconsistent green wave reference lines can also achieve green wave control. The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] Embodiment 1:

[0028] This embodiment provides a method for correcting the coordination phase difference of a multi-system signal controller. Refer to Figure 1 , the method is applied to the signal machines at adjacent intersections within the same "green wave band" section, and includes:

[0029] Step 1, define a green wave reference line as 00:00:00, and use 00:00:00 as the reference line for the coordination phase difference of the multi-system signal controller;

[0030] Step 2, assume that intersection A and intersection B within the "green wave band" section are adjacent intersections, and the two intersections use signal machines of different systems, and the traffic direction is from intersection A to intersection B;

[0031] Assume that the green wave reference line used by the signal machine at intersection A is 00:00:00, and the green wave reference line used by the intersection is the start time of the multi-period green wave plan; the so-called multi-period green wave plan means that different green wave plans are adopted in different periods (morning peak, evening peak, and off-peak periods). For example, different green wave plans are set for the morning peak period from 7:00 to 9:00, the evening peak period from 5:00 to 7:00, and the off-peak period except for the morning and evening peak periods respectively.

[0032] Step 3, calculate the theoretical phase difference of intersection B according to the distance between intersection A and intersection B

[0033] Step 4, set the start time of the multi-period green wave plan at intersection B as T b , calculate the phase difference deviation value r of intersection B according to the following formula:

[0034] r = t b / c

[0035] where, t b = hour(T b)×3600 + min(T b )×60, representing the start time T of the multi - period green wave plan at intersection B b Converted to a value in seconds; c represents the unified signal cycle adopted for the coordinated green wave at intersections A and B;

[0036] Step 5, calculate the actual phase difference of intersection B according to the following formula

[0037]

[0038] Step 6, set the signal machine of intersection B according to the calculated actual phase difference of intersection B to complete the phase coordination of signal machines of different systems on the same road section.

[0039] Embodiment 2:

[0040] This embodiment provides a method for correcting the coordinated phase difference of a multi - system signal machine, and the method includes:

[0041] Step 1, define a green wave baseline as 00:00:00, and use 00:00:00 as the baseline for the coordinated phase difference of the multi - system signal machine.

[0042] Step 2, the green wave baseline adopted by the signal machine at intersection A is a multi - period green wave plan, and the green wave adopted by the signal machine at intersection B is the start time of the multi - period green wave plan. Assume that the multi - period green wave plan of the signal machine at intersection B is to adopt the green wave plan during the morning and evening peak hours and not adopt the green wave plan during the off - peak hours, where the morning peak hour is 7:00 - 9:00 and the evening peak hour is 17:00 - 21:00.

[0043] Step 3, the formation of the coordinated green wave phase difference of the road section is related to the vehicle driving speed and the intersection distance. As Figure 2 shown, assume that the vehicle driving speeds at intersections A and B are 50 km / h and the distance between intersections A and B is x m, then the phase difference at intersection A is

[0044] Step 4, since the phase difference obtained in step 3 is for the same - system signal machines at intersections A and B, in fact, intersections A and B are different - system signal machines, and there is a deviation in the phase difference obtained in step 3, and its deviation needs to be corrected.

[0045] Step 5, the green wave baseline at intersection A is 00:00:00, and the green wave baseline at intersection B is the start time of the multi - period green wave plan. Let T b .

[0046] First, convert T b to a number t in seconds b , and convert T bMultiply the part corresponding to hours by 3600, T b Multiply the part corresponding to minutes by 60. The specific formula is as follows:

[0047] t b = hour(T b ) × 3600 + min(T b ) × 60

[0048] Step 6: Calculate the deviation value. The same signal cycle c is used for coordinated green wave at A and B. Divide the converted number t of intersection B b by the cycle c to obtain the deviation value r. The specific formula is as follows:

[0049] r = t b / c

[0050] Step 7: The actual phase difference at intersection B is obtained by subtracting the deviation value from the phase difference obtained in Step 3.

[0051]

[0052] Step 8: Fill the obtained actual phase difference into the signal controller of intersection B, and the phase coordination of signal controllers of different systems on the same road section can be completed.

[0053] Suppose intersections A and B are selected, and the signal cycle is 125 seconds for both. The green wave baseline of intersection A is 00:00:00, and the green wave baseline of intersection B is the start time of the time period. When the time period starting at 09:00:00 is considered for intersections A and B, theoretically, when the phase difference of intersection A is set to 0 and the phase difference of intersection B is set to 40, the green wave effect can be achieved at intersections A and B. However, due to the difference in the green wave baselines of intersections A and B, the actual operating phase difference of intersection A is 0, while the actual operating phase difference of intersection B relative to intersection A is 65, that is, the deviation value r = 65 - 40 = 25, resulting in the inability to operate the green wave plan under the original phase difference configuration. By the above calculation process, the phase difference of intersection B is corrected, and the set phase difference should be 15, that is, 40 - 25 = 15.

[0054] Some steps in the embodiments of the present invention can be implemented by software, and the corresponding software program can be stored in a readable storage medium, such as an optical disc or a hard disk, etc.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for correcting the coordination phase difference of a multi-system signal controller, characterized in that The method is applied to the signal machines at adjacent intersections within the same "green wave band" section. The signal machines at the adjacent intersections adopt different green wave reference lines. The method includes: Calculating the theoretical phase difference of another intersection based on the green wave reference line of the signal machine at one of the intersections, then calculating the phase difference deviation value of the other intersection according to the green wave reference line of the other intersection and the signal period of the green wave scheme adopted within the "green wave band" section, and further calculating the actual phase difference of the other intersection. Setting the signal machine of the other intersection according to the actual phase difference, so as to complete the phase coordination of the signal control machines of different systems within the "green wave band" section; Assume that two adjacent intersections within the "green wave band" section are intersection A and intersection B respectively. The signal machines at the two intersections adopt different green wave reference lines. The method includes: Step S1, define a green wave reference line as 00:00:00, and use 00:00:00 as the reference line for the coordinated phase difference of the multi-system signal control machine; assume that the green wave reference line adopted by the signal machine at intersection A is 00:00:00, and the green wave reference line adopted by the intersection is a multi-period green wave scheme; Step S2: Calculate the theoretical phase difference of intersection B based on the distance between intersection A and intersection B Step S3, set the start time of the multi-period green wave plan at intersection B as T b , and calculate the phase difference deviation value r of intersection B according to the following formula: r = t b / c where t b = hour(T b ) × 3600 + min(T b ) × 60, representing the time T b when the multi-period green wave plan at intersection B starts, converted to a value in seconds; c represents the unified signal cycle adopted for coordinated green waves at intersections A and B; Step S4, calculate the actual phase difference of intersection B according to the following formula as Step S5: Determine the actual phase difference of intersection B based on the calculation. Set the signal controller of intersection B to complete the phase coordination of signal controllers of different systems on the same road section.

2. The method according to claim 1, wherein Calculating the theoretical phase difference of intersection B based on the distance between intersection A and intersection B including: Wherein, d represents the distance between intersection A and intersection B, and v represents the green wave speed within the "green wave band" section where intersection A and intersection B are located.

3. The method according to claim 2, characterized in that If the green wave reference line adopted by the signal machine at intersection A is a multi-period green wave scheme, and the green wave reference line adopted by the signal machine at intersection B is 00:00:00, then according to the steps S2 to S5 shown, the actual phase difference of the signal machine at intersection A is calculated as And the signal machine at intersection A is correspondingly set to complete the phase coordination of signal control machines of different systems on the same road section.

4. A coordinated phase difference correction system for a multi-system signal controller, characterized in that, The system includes signal machines that adopt different green wave reference lines within the same "green wave band" section. The system uses the method described in any one of claims 1-3 to correct the phase difference of the signal machines with different green wave reference lines at adjacent intersections within the same "green wave band" section.

Images