Traffic signal machine triggered countdown control output method

Abstract

The application discloses a traffic signal lamp trigger type countdown control output method, comprising the following steps: S100, configuring signal lamp fixed time countdown time length and configuring current cycle phase information; S200, reading the cycle phase information of the traffic signal lamp at the current time node and the signal lamp fixed time countdown time length, and generating a running phase chain table; S300, judging whether the time before the non-traffic light color of the current lost traffic right phase meets the configured fixed time countdown time length; S400, if the configured fixed time countdown time length is met, triggering the corresponding countdown timer; if the configured fixed time countdown time length is not met, performing countdown correction and calculating the countdown extension time; and S500, repeating steps S200-S400. The application can generate a running phase chain table under the condition that traffic intersection parameters are pre-configured, pre-add, real-time update and calculate signal control data to achieve accurate control of the time when the trigger signal triggers the countdown timer, and realize the trigger type pulse control countdown algorithm.

Description

Technical Field

[0001] This invention relates to the field of signal control technology for intelligent transportation, specifically a trigger-based countdown control output method for traffic signal controllers. Background Technology

[0002] With the development of technology, intelligent traffic signal control systems have emerged. These systems often employ adaptive control, which involves detecting current traffic flow information through sensors and transmitting the data in real-time to the control center via a network. The control center then calculates the optimal green light timing scheme in real-time and adjusts the green light duration each cycle to minimize intersection delays and the number of stops. The control center can coordinate multiple intersection signal controllers, allowing their operation to adaptively adjust according to changes in traffic flow, thereby improving the overall efficiency of the main road or area.

[0003] Currently, most traffic signals at intersections use a follow-up countdown timer. This type of countdown is only suitable for fixed-cycle control and cannot meet the needs of adaptive control modes under intelligent transportation systems. Furthermore, it requires relearning when the cycle changes, rendering the countdown timer unusable. Existing trigger-type countdown timers suffer from problems such as long trigger times, susceptibility to external interference (mistaking strong interference pulses for the given control signal pulses), and poor compatibility. These issues prevent the traffic signal controller from controlling the countdown timer in a timely and effective manner, resulting in inaccurate timing of the trigger signal and phenomena such as jittering, flickering, or trailing, causing traffic chaos and congestion.

[0004] The objective of this patent is to design and implement a trigger-based pulse control countdown algorithm, enabling traffic signal controllers to control the countdown timer in a timely, effective, and accurate manner, thereby adapting to more traffic signal control modes and alleviating traffic congestion. Summary of the Invention

[0005] The purpose of this invention is to provide a signal light-triggered countdown control output method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A traffic light trigger-type countdown control output method includes the following steps:

[0008] S100: Configure the countdown duration of the traffic light and configure the current cycle phase information;

[0009] S200: Read the periodic phase information and the countdown duration of the traffic light at the current time node, and generate a running phase linked list;

[0010] S300: Determine whether the time before the non-passing light color of the phase that has lost the right of way meets the configured timeout countdown duration.

[0011] S400: If the configured countdown duration is met, the corresponding countdown timer is triggered; if the configured countdown duration is not met, countdown correction is performed, and the countdown extension time is calculated.

[0012] S500, repeat steps S200-S400.

[0013] As a further aspect of the present invention: the phase can be divided into five types according to the life cycle of the stage: late start, entry transition, operation, exit transition, and early end. The operation phase list contains multiple phases, and the maximum value of the difference between the multiple phases is used as the extension time. The difference determination process is as follows:

[0014]

[0015] t 差值 To extend the countdown time, t 倒计时 T is the countdown duration for the configured traffic light. 过渡 t represents the time t takes for the current phase to enter the transition phase. 退，i t represents the time t takes for the current phase to exit the transition. 早结束 The time when the current phase ends is the earliest, and i represents which phase.

[0016] If t 差值 The value is 0, which satisfies the configuration of the fixed-range countdown duration t. 倒计时 If the conditions are not met, a countdown will be triggered. If not, a countdown correction will be performed, and the extension time t for triggering the countdown will be recalculated. 差值 until t 差值 If the value is 0, a countdown will be triggered.

[0017] As a further aspect of the present invention: the hardware device for implementing the control output method includes a controller for controlling the display status of traffic lights. The controller is connected to a countdown display. The controller includes a main control module and a drive module. The input terminal of the drive module is connected to the output terminal of the main control module, and the output terminal of the drive module is connected to the input terminal of the countdown display. In step S200, the main control module reads the phase information, parameters, and countdown duration of the traffic lights at the current time node and generates a running phase list. The running phase list is a dynamic data list of the actual controlled traffic lights generated by the phase and stage configuration parameters issued by the controller or manual control.

[0018] As a further aspect of the present invention: In step S400, when the main control module runs the phase chain to detect that the corresponding light color changes at the current time point and the next time point and meets the trigger configuration signal light's fixed-range countdown duration, it triggers a specific drive module to turn off the light once and outputs it as a trigger signal. After receiving the trigger signal, the countdown display starts the fixed-range display.

[0019] As a further aspect of the present invention, the signal period of the trigger signal is controlled between 150ms and 300ms.

[0020] As a further aspect of the present invention: the follow time displayed by the countdown display should not exceed one signal cycle, and the countdown display should display a black screen state during the follow period.

[0021] Compared with existing technologies, the beneficial effects of this invention are as follows: This algorithm can generate a running phase list by pre-configuring parameters such as daily traffic intersection plans, stages, phases, and trigger countdown durations. It uses pre-added, real-time updated, and calculated signal control data to accurately control the trigger signal's countdown time, realizing a trigger-type pulse control countdown algorithm. This achieves accurate and efficient trigger control of the traffic signal countdown timer, alleviating the on / off reaction caused by the trigger signal. It does not require "pre-learning," saving time, and can also be used in various complex traffic timing environments, such as adaptive mode and other traffic signal control modes, to alleviate traffic congestion. Attached Figure Description

[0022] Figure 1 This is a flowchart of the countdown output control program for the present invention.

[0023] Figure 2 This invention relates to the process of generating a three-phase running phase linked list in this embodiment. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figure 1 In this embodiment of the invention, a traffic light trigger-type countdown control output method includes the following steps:

[0026] S100: Configure the countdown duration of the traffic light and configure the current cycle phase information;

[0027] S200: Read the periodic phase information and traffic light countdown duration for the current time point, and generate...

[0028] Form a running phase linked list;

[0029] S300: Determine whether the time before the non-passing light color of the phase that has lost the right of way meets the configured timeout countdown duration.

[0030] S400: If the configured countdown duration is met, the corresponding countdown timer is triggered; if the configured countdown duration is not met, countdown correction is performed, and the countdown extension time is calculated.

[0031] S500, repeat steps S200-S400.

[0032] The hardware device used to implement this control output method includes a controller for controlling the display status of traffic lights. The controller is connected to a countdown display. The controller includes a main control module and a drive module. The input terminal of the drive module is connected to the output terminal of the main control module, and the output terminal of the drive module is connected to the input terminal of the countdown display. In step S200, the main control module reads the phase information, parameters, and countdown duration of the traffic lights at the current time node and generates a running phase list. The running phase list is a dynamic data list generated by the phase and stage configuration parameters issued by the controller or manual control to actually control the traffic lights. The advantage of establishing a dynamic data list is that control data can be added to the controller in advance, and signal control data can be calculated in real time to achieve precise control of the trigger signal to trigger the countdown timer.

[0033] The phases can be divided into five types according to their life cycle: late start, transition, operation, transition exit, and early end. Figure 2 Taking a control scheme involving three-phase signal control in one stage as an example, the dynamic phase list generation process is illustrated: the three phases are the first phase, the second phase, and the third phase. A complete phase cycle T contains five stages, and the running period of each phase stage is equal. A certain transition time needs to be set for the switching between phases.

[0034] During the t0-t1 phase, the states of the first phase, the second phase, and the third phase are late start, transition, and transition, respectively.

[0035] During the t1-t2 phase, the states of the first phase, the second phase, and the third phase are respectively: entering transition, running, and entering transition.

[0036] During the t2-t3 phase, the states of the first phase, the second phase, and the third phase are running, running, and running, respectively.

[0037] During the t3-t4 phase, the states of the first phase, the second phase, and the third phase are running, exiting the transition, and running, respectively.

[0038] During the t4-t5 phase, the states of the first phase, the second phase, and the third phase are exit transition, early termination, and exit transition, respectively.

[0039] The main control module acquires the phase and phase configuration parameters for this stage, generates a running phase linked list, and combines it with the control flowchart of the trigger countdown output control program. Using the light color of the lamp group at time node t of the running phase as the reference light color, it searches for the next node where the light color changes and the duration meets the configured countdown duration. This triggers a specific drive module to turn off the light once, which is output as a trigger signal. The countdown display starts displaying the countdown after receiving the trigger signal. If the configured light group is green and the lighting time does not meet the countdown duration, countdown correction is required. The correction method is as follows:

[0040] The countdown time for the release phase is calculated, taking the maximum value of the execution time of the light group included in that phase.

[0041] In the basic exit transition sequence, determine whether the time before the non-passing light color for the phase that loses the right-of-way can meet its own countdown requirements. If not, calculate the difference; use the maximum value of the differences from multiple phases as the extension time; the difference determination process is equivalent to...

[0042]

[0043] t 差值 To extend the countdown time, t 倒计时 T is the countdown duration for the configured traffic light. 过渡 t represents the time t takes for the current phase to enter the transition phase. 退，i t represents the time t takes for the current phase to exit the transition. 早结束 The time when the current phase ends is the earliest, and i represents which phase.

[0044] If t 差值 The value is 0, which satisfies the configuration of the fixed-range countdown duration t. 倒计时 If the conditions are not met, a countdown will be triggered. If not, a countdown correction will be performed, and the extension time t for triggering the countdown will be recalculated. 差值 until t 差值 If the value is 0, a countdown will be triggered.

[0045] Furthermore, the signal period of the trigger signal is controlled between 150ms and 300ms.

[0046] Furthermore, the follow time displayed by the countdown display should not exceed one signal cycle, and the countdown display should show a black screen during the follow period.

[0047] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0048] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A method for trigger-type countdown control output of a traffic signal controller, characterized by comprising the following steps: S100: Configure the countdown timer duration for the traffic light and configure the current cycle phase information; S200: Read the periodic phase information and the countdown duration of the traffic light at the current time node, and generate a running phase linked list; S300: Determine whether the time before the non-passing light color of the phase that has lost the right of way meets the configured timeout countdown duration. The phases can be divided into five types according to their life cycle: late start, transition, operation, transition exit, and early end. The operation phase list contains multiple phases, and the maximum value of the difference between the multiple phases is used as the extension time. The difference determination process is as follows: To extend the countdown time, The duration of the countdown timer for the configured traffic lights. The time for the current phase to enter the transition phase. The time for the current phase to exit the transition. The current phase ends early, and i represents the phase number. like The value is 0, which satisfies the configuration of the timer countdown duration. If the conditions are not met, a countdown will be triggered. If not, a countdown correction will be performed, and the extension time for triggering the countdown will be recalculated. until A value of 0 triggers a countdown. S400: If the configured countdown duration is met, the corresponding countdown timer is triggered; if the configured countdown duration is not met, countdown correction is performed, and the countdown extension time is calculated. S500, repeat steps S200-S400.

2. The traffic signal controller trigger-type countdown control output method according to claim 1, characterized in that, The hardware device used to implement this control output method includes a controller for controlling the display status of traffic lights. The controller is connected to a countdown display. The controller includes a main control module and a drive module. The input terminal of the drive module is connected to the output terminal of the main control module, and the output terminal of the drive module is connected to the input terminal of the countdown display. In step S200, the main control module reads the phase information, parameters, and countdown duration of the traffic lights at the current time node and generates a running phase list. The running phase list is a dynamic data list generated by the phase and stage configuration parameters issued by the controller or manual control to obtain the actual controlled traffic lights.

3. The traffic signal controller trigger-type countdown control output method according to claim 2, characterized in that, In step S400, the main control module runs the phase chain list to detect that the corresponding light color changes at the current time point and the next time point, and the trigger configuration signal light countdown duration is met. Then, it triggers a specific drive module to turn off the light once and outputs it as a trigger signal. After receiving the trigger signal, the countdown display starts to display the countdown.

4. The traffic signal controller trigger-type countdown control output method according to claim 3, characterized in that, The signal period of the trigger signal is controlled between 150ms and 300ms.

5. The traffic signal controller trigger-type countdown control output method according to claim 1, characterized in that, The follow time displayed by the countdown display should not exceed one signal cycle, and the countdown display should show a black screen during the follow period.

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