Integrated operation and maintenance method for traffic signal lamp fault detection

Abstract

The invention discloses an integrated operation and maintenance method for traffic signal lamp fault detection, and the method comprises the steps: S1, signal lamp end detection and fault study and judgment: a signal lamp end fault detection circuit collects the input voltage current value and the output voltage current value of each lamp color channel of a signal lamp, so as to distinguish the abnormal power-off control and the lamp-off control; s2, signal lamp grouping management and information aggregation: the signal lamps transmit the self-inspection data to a near point extension set, and the extension set transmits the gathered and converted signal lamp self-inspection data to an intersection host; s3, lamp and machine integrated fault detection: a signal machine generates a signal lamp with accurate positioning through signal lamp self-inspection data and a connection state reported by an access host, exterior line fault information and multi-channel green conflict research and judgment; and S4, lamp-machine integrated fault operation and maintenance: positioning the fault to a signal lamp or a signal lamp connection external line or a signal machine output external line. And the requirements of signal lamp fault accurate detection and rapid positioning treatment are met.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent traffic signal control equipment, and in particular to an integrated operation and maintenance method for traffic signal lamp fault detection. Background Art

[0002] Traffic lights are signal devices composed of different combinations of red, yellow and green lights, used to direct the passage of vehicles and pedestrians. Traffic signals are devices that can change the sequence of traffic signals, adjust the timing and control the operation of traffic lights, so as to achieve system control and road right allocation of multiple groups of traffic lights at intersections.

[0003] Traffic signals provide independent power supply for each color of signal lights, and the red, green and yellow right of way conversion of traffic lights is realized by turning the power on and off. However, when the device and line failure occurs at the intersection, the traffic lights will lose part or all of their signal command capabilities, and even produce wrong traffic command signals, disrupting the orderly and safe traffic order at the intersection, and having a negative impact on the safety of life and property of travelers. Especially in the context of the demand for Internet of Vehicles communications and the construction of vehicle-road-cloud integrated demonstration areas, roadside intelligent facilities have higher requirements for the reliability of signal light status data. Whether the real-time status and fault information of the signal lights can be obtained in time, and accurate signal light status analysis and fault handling can be made, is a necessary condition for the network-assisted or autonomous driving to achieve all-weather, safe and orderly operation.

[0004] There are three main existing signal light fault detection technology solutions:

[0005] Solution 1: Add a circuit detection function to the signal output end of the signal machine. If the voltage and current values ​​are within a certain range, the signal light is considered normal, otherwise it is abnormal. This method actually detects the entire signal light output circuit. Affected by the engineering environment, the detection result cannot truly reflect the operating status of the signal light, and the specific fault location cannot be located.

[0006] Solution 2: Add a circuit detection function to the signal light. If the voltage and current values ​​are within a certain range, the signal light is considered normal, otherwise it is abnormal. This method cannot determine whether the external line of the signal light is broken or short-circuited, and the independent detection method of a single light requires additional power supply, communication and return links to analyze, summarize and return fault information, which has many limitations in engineering applications.

[0007] Solution 3: Detection through video, that is, using a camera to monitor the status of the traffic light in real time, and extracting and identifying the working status of the traffic light through the background video intelligent detection module. The accuracy of this method is greatly affected by rain, snow, fog and other environments, and the judgment types are limited, the cost is high, and it also does not have the ability to locate faults.

[0008] It can be seen that the existing technical solutions are mostly focused on improving and optimizing the single-end fault detection capabilities. There are technical upper limits on the detection accuracy and coverage, and the integrated application and system analysis of multi-end detection data are ignored. There are shortcomings such as low detection accuracy, few fault types, and lack of positioning capabilities, which cannot support accurate and efficient operation and maintenance work. Summary of the invention

[0009] In order to solve the above technical problems, the present invention provides an integrated operation and maintenance method for traffic signal light fault detection, the method comprising the following steps:

[0010] S1. Detection and fault analysis at the signal light end: The fault detection circuit at the signal light end collects the input voltage and current values ​​and the output voltage and current values ​​of each light color channel of the signal light. At the same time, the input current of each light color channel is used as the working power supply. In the case of losing the current input of all channels, the capacitor maintains normal operation for a certain period of time to distinguish abnormal power failure and light off control;

[0011] S2, Traffic light group management and information aggregation: The traffic light transmits the self-test data to the near-point extension, and the extension transmits the aggregated and converted traffic light self-test data to the intersection host; wherein, the extension needs to complete the matching of the reported number of the traffic light and the received number of the signal machine, and perform forced conversion through the matching relationship table; the host is responsible for the maintenance of the number relationship table between the traffic light and the signal machine;

[0012] S3, integrated fault detection of lights and machines: The signal machine collects the global information of the intersection through the self-test data and connection status reported by the access host, generates the signal light and external line fault information with accurate positioning; and based on the effective signal light operation status of all machine-side channels, extracts the machine-side channel number set that currently outputs the green light, which is used for multi-channel green conflict analysis;

[0013] S4. Light and machine integrated fault operation and maintenance: through the light and machine integrated fault detection, the fault is located at the signal light or the signal light connected external line or the signal machine output external line.

[0014] Furthermore, the signal light end fault detection circuit includes a control module, a network module, a CAN module, a GPS module, a power processing module, an AC voltage and current acquisition module, an LED constant current drive module and an LED dot matrix voltage and current detection module, wherein:

[0015] The power processing module is used to convert the 220V alternating current of the three red, yellow and green inputs into a stable 5V direct current for use by the control module, and also convert the 220V alternating current of the three red, yellow and green inputs into three 16V direct currents for use by the corresponding red, yellow and green LED lights;

[0016] The AC voltage and current acquisition module is used to acquire the actual voltage and current of the three signal lamp inputs;

[0017] The LED constant current drive module is used to provide appropriate current to the LED to adjust the brightness, and the control module can receive the brightness adjustment command of the network module and the CAN module to adjust the brightness of the signal light, and can also adjust the brightness through the time obtained by the GPS module;

[0018] The LED dot matrix voltage and current detection module is used to detect the voltage and current of the three-way signal light LED when it is working, so as to judge the voltage and current of the LED lamp and the damage of some lamps, and send the status of the LED lamp in real time through the CAN bus and the network bus.

[0019] Furthermore, the signal light end detection and fault analysis method also includes:

[0020] S11, the signal lamp end fault detection circuit is based on the set effective input voltage and current threshold [U A , I A ], determine the on / off of the AC-DC conversion circuit, and output the result of the light color channel input detection, where 1 indicates input and 0 indicates no input;

[0021] S12, the signal lamp end fault detection circuit is based on the set effective output voltage and current threshold [U B , I B ], determine the on and off of each color LED light panel, where 1 means on and 0 means off; according to whether the output power of each color LED light panel and the standard power ratio is lower than the set low brightness threshold PL, judge whether each color LED light panel is in a low brightness state, where 1 means low brightness and 0 means normal; the low brightness state recovery requires the output power and standard power ratio to be higher than the set low brightness recovery threshold P N ;

[0022] S13. By comparing the detection results of the signal light input and output, it is possible to obtain the signal light damage and false lighting fault information, wherein:

[0023] The light color channel set whose input detection result is 1 in S11 is recorded as input A, and the light color channel set whose output detection result is 1 in S12 is recorded as output B;

[0024] Damage determination and recovery rules: When AB is not empty, there is damage to the light color channel included in AB, which is recorded as a damage fault of the light color channel included in AB under the input A condition; the damage fault of the light color channel can only be restored if AB does not have the light color channel under the input A condition;

[0025] Determine the rules for false lighting and recovery: When BA is not empty, there is false lighting of the BA light color channel, which is recorded as the false lighting fault of BA including the light color channel under the input A condition; the false lighting fault of the light color channel can only be restored when BA does not have the channel under the input A condition.

[0026] Furthermore, the S2 further includes:

[0027] The extension is a signal light end node module, responsible for communicating with multiple signal lights and signal machine end nodes, and parsing and forwarding the data reported by the signal lights and the data queried by the signal machine end; the signal lights connected to the same extension are grouped together, and the signal lights in the same group are numbered to avoid duplication;

[0028] The host is a signal machine end node module, responsible for communicating with multiple signal light end nodes and signal machines, and parsing and forwarding the data reported by the signal light end and the data queried by the signal machine; the host is an independent device or an extended function module of the signal control machine;

[0029] The host and the extension are connected by wire or wirelessly.

[0030] Furthermore, the host has a heartbeat monitoring function for the extension while forwarding the signal light self-test data reported by the extension, wherein:

[0031] After the extension stops actively reporting data for 3 seconds, a heartbeat query is actively performed. If the extension does not reply, the extension is considered offline and the connection is actively disconnected to wait for the extension to reconnect. When the extension is offline, the associated signal machine end channel is set to offline;

[0032] When the extension detects that the signal light continuously outputs more than N light-off signals, the channel enters a silent state and stops monitoring the channel subsequently; if the silent state is not achieved, that is, the sending of self-test data is stopped, the channel enters an abnormal offline state.

[0033] Furthermore, the S3 also includes a method for independent fault detection at the signal machine end, including:

[0034] A signal control module is used to generate the signal light control light color of the source node;

[0035] The signal machine driving module obtains the signal light external line output light color and other fault information except the low brightness fault according to the signal light control light color and the voltage and current values ​​detected at the signal machine end.

[0036] Furthermore, the method for independent fault detection at the signal machine end also includes:

[0037] The control light colors of the signal lights are set I, and the external line output light colors of the signal lights are set O. The simultaneous lighting fault is judged as follows:

[0038] When I≠O, and the number of O elements is greater than 1, it is recorded as the O element simultaneous lighting fault under the control light color I; under the condition of the same control light color I, the O element is not greater than 1, and the conditional simultaneous lighting fault associated with the control light color I is cleared;

[0039] When a conditional simultaneous lighting fault is added, if the newly added conditional simultaneous lighting fault does not belong to the currently recorded simultaneous lighting fault, then a simultaneous lighting fault is added, otherwise, no new fault is added;

[0040] When the conditional simultaneous lighting fault is deleted, if there is a recorded simultaneous lighting fault that is no longer supported by the conditional simultaneous lighting fault, it is determined that the simultaneous lighting fault that is not supported by the conditional simultaneous lighting fault is restored.

[0041] Furthermore, the signal light in S3 is used to collect the global information of the intersection by accessing the signal light self-test data and connection status reported by the host, including:

[0042] Determine the host connection status, where the host connection status is global data:

[0043] If the host connection status is offline, the single-channel signal machine end is independently judged, and multi-channel green conflict judgment is performed;

[0044] If the host connection status is online, the traffic light connection status is determined; if the traffic light connection status is offline, an independent judgment is made on the single-channel signal machine end, and a multi-channel green conflict judgment is performed; if the traffic light connection status is online, a comprehensive judgment is made on the single-channel light machine, and a multi-channel green conflict judgment is performed.

[0045] Furthermore, the method for comprehensive evaluation of the single-channel lamp includes:

[0046] S31, signal light self-test fault output: compare the currently recorded damage / false lighting / low brightness fault with the damage / false lighting / low brightness fault existing in the signal light self-test data D, and if it is not currently recorded, output the damage / false lighting / low brightness fault of the corresponding light color; if the currently recorded damage / false lighting / low brightness fault exists in the signal light self-test data D, output the damage / false lighting / low brightness fault recovery of the corresponding light color;

[0047] S32, signal light self-test simultaneous lighting judgment: record the input light color 1 in the signal light self-test data D as D1, record the input light color 2 in the signal light self-test data D as D2, and by comparing D1 and D2, obtain the signal light self-test simultaneous lighting fault based on the machine-side channel number + extension number, where:

[0048] S32-1, when D1≠D2, and the number of D2 elements is greater than 1, it is recorded as a D2 element simultaneous lighting fault under the control light color D1; under the condition of the same control light color D1, the D2 element is not greater than 1, and the conditional simultaneous lighting fault associated with the control light color D1 is cleared;

[0049] S32-2, when a conditional simultaneous lighting fault is added, if the newly added conditional simultaneous lighting fault does not belong to the currently recorded simultaneous lighting fault, then a simultaneous lighting fault is added, otherwise, no new fault is added;

[0050] S32-3, when the conditional simultaneous lighting fault is deleted, if there is a simultaneous lighting fault currently recorded that is no longer supported by the conditional simultaneous lighting fault, determining that the simultaneous lighting fault that is not supported by the conditional simultaneous lighting fault is restored;

[0051] S33, signal light external line fault analysis: record the control light color 1 in the machine end detection data B as B1, record the input light color 1 in the signal light self-test data D as D1, and by comparing B1 and D1, obtain the signal light external line fault located based on the machine end channel number + extension number, and record it as damage fault 1 and false light fault 2 in the signal light external line fault data E, where:

[0052] S33-1, when B1-D1 is not empty, there is damage to the light color channel included in B1-D1, which is recorded as a damage fault of the light color channel included in B1-D1 under the condition of input B1; the damage fault of the light color channel can only be restored when B1-D1 does not include the light color channel under the condition of input B1;

[0053] S33-2, when D1-B1 is not empty, there is a false light on of the light color channel of D1-B1, which is recorded as a false light on fault of D1-B1 including the light color channel under the condition of input B1; the false light on fault of the light color channel can be restored only when D1-B1 does not include the light color channel under the condition of input B1;

[0054] S34, simultaneous lighting judgment of signal light external lines: by comparing the control light color 1 in the machine-side detection data B and the input light color 1 in the signal light self-test data D, the simultaneous lighting fault of the signal light external lines located based on the machine-side channel number + extension number is obtained, which is recorded as simultaneous lighting fault 3 in the signal light external line fault data E;

[0055] S35, external line fault elimination: For the machine channel number with extended signal light output, record the damage fault 3 and the false light fault 4 in the machine detection data B as B3 and B4, and record the damage fault 1 and the false light fault 2 in the signal light external line fault data E as E1 and E2; by comparing B3 with E1, B4 with E2, some external line faults can be eliminated, among which:

[0056] S35-1, Damage fault elimination: For the damaged fault light color channel in B3, if there are unfaulted extended signal light outputs in multiple E1s corresponding to the same machine-side channel number, the damaged fault light color channel in B3 is eliminated;

[0057] S35-2. Troubleshooting of erroneous lighting faults: For the erroneous lighting fault light color channel in B4, if there are non-faulty extended signal light outputs in multiple E3s corresponding to the same machine-side channel number, the erroneous lighting fault light color channel in B4 is eliminated.

[0058] Furthermore, the multi-channel green conflict analysis method includes:

[0059] Filter the valid signal light operation status data of all machine-side channels according to the signal light connection status C:

[0060] For the machine-side channel with an online status signal light, take the output light color 2 in the signal light self-test data D;

[0061] For the machine-side channel without online status signal light, take the external line output 2 in the machine-side detection data B;

[0062] Based on the operating status of the valid signal lights of all machine-side channels, extract the machine-side channel number set that currently outputs the green light, and determine whether there is a channel object that meets the green conflict relationship in the set. If so, output a green conflict fault, and the fault object is the machine-side channel number set.

[0063] Compared with the prior art, the present invention has the following beneficial effects:

[0064] The present invention can quickly discover fault types such as damage to signal lights and external lines, false lighting, low brightness, and simultaneous lighting, and analyze multi-channel green conflict faults. It can realize the positioning of multiple groups of signal light outputs, positioning of fault-occurring nodes, and single-source degradation analysis under node communication failures or detection defaults, which greatly reduces the difficulty and workload of operation and maintenance in complex intersection engineering environments, and meets the needs of accurate detection and rapid positioning and disposal of signal light faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is a block diagram of the signal light end fault detection circuit disclosed in the present invention;

[0066] Figure 2 It is a schematic diagram of the signal light end detection and fault diagnosis and analysis disclosed in the present invention;

[0067] Figure 3 A schematic diagram of the grouping management and information aggregation of traffic lights disclosed in the present invention;

[0068] Figure 4 It is the extension function network topology diagram disclosed by the present invention;

[0069] Figure 5 It is a block diagram of the communication extension module disclosed in the present invention;

[0070] Figure 6 A schematic diagram of forced conversion between a signal light and a signal machine disclosed in the present invention through a matching relationship;

[0071] Figure 7 A host function network topology diagram disclosed in the present invention;

[0072] Figure 8 It is a schematic diagram of the signal machine end detection data analysis disclosed in the present invention;

[0073] Fig. 9 It is a schematic diagram of the lamp-machine integrated fault analysis process disclosed by the present invention;

[0074] Fig.10 A globally locatable fault unit topology diagram disclosed in the present invention;

[0075] Fig.11 This is the data flow and node topology diagram of the integrated fault operation and maintenance of the lamp and machine disclosed in the present invention. DETAILED DESCRIPTION

[0076] In order to make the technical scheme and technical effect of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0077] The present invention aims to provide an integrated operation and maintenance method for traffic light fault detection, which aggregates signal control information, light-end detection information, and machine-end detection information through integrated communication and operation and maintenance modules, and establishes a fault operation and maintenance mechanism between the master and slave modules of the system to ensure system reliability and backup disposal plans; on this basis, a systematic analysis is performed on the aggregated information to generate traffic light fault information with full coverage, high accuracy, and positioning capability.

[0078] The following is a detailed introduction to this method:

[0079] 1. Signal light detection and fault analysis

[0080] The fault detection circuit at the signal light end collects the input voltage and current values ​​and the output voltage and current values ​​of each light color channel of the signal light. At the same time, the input current of each light color channel is used as the working power supply. In the case of losing the current input of all channels, normal operation is maintained for a certain period of time through the capacitor, including detection, analysis and output, to distinguish between abnormal power outages and light off control.

[0081] refer to Figure 1The signal light fault detection circuit includes a control module, a network module, a CAN module, a GPS module, a power processing module, an AC voltage and current acquisition module, an LED constant current drive module, and an LED dot matrix voltage and current detection module, wherein:

[0082] The power processing module is used to convert the three-way 220V AC input of red, yellow and green into a stable 5V DC power for use by the control module. In addition, the three-way 220V AC input of red, yellow and green is converted into three 16V DC power for use by the corresponding red, yellow and green LED lights.

[0083] The AC voltage and current acquisition module mainly uses an ammeter chip to collect the actual voltage and current of the three light colors of red, yellow and green for input to the traffic light.

[0084] The LED constant current drive module is used to provide appropriate current to the LED to adjust the brightness, and the control module can receive brightness adjustment commands from the network module and the CAN module to adjust the brightness of the signal light, and can also adjust the brightness through the time obtained by the GPS module.

[0085] The LED dot matrix voltage and current detection module is used to detect the voltage and current of the red, yellow and green three-way signal light LED when it is working, so as to judge the voltage and current of the LED lamp and the damage of some lamps, and send the status of the LED lamp in real time through the CAN bus and network bus.

[0086] The fault analysis method of the signal light is as follows:

[0087] The signal lamp fault detection circuit is based on the set effective input voltage and current threshold [U A , I A ], determine the on and off of the AC-DC conversion circuit, and output the result of the light color channel input detection, where 1 means input and 0 means no input.

[0088] The fault detection circuit at the signal light end determines whether the LED light panels of each color are on or off according to the set effective output voltage and current thresholds [UB, IB], where 1 indicates on and 0 indicates off; based on whether the ratio of the output power of the LED light panels of each color to the standard power is lower than the set low brightness threshold PL, it determines whether the LED light panels of each color are in a low brightness state, where 1 indicates low brightness and 0 indicates normal; to recover from the low brightness state, the ratio of the output power to the standard power must be higher than the set low brightness recovery threshold PN.

[0089] By comparing the input and output test results of the signal light, we can determine whether the signal light is damaged or lights up incorrectly:

[0090] (1) The set of light color channels whose input detection result is 1 is recorded as input A, and the set of light color channels whose output detection result is 1 is recorded as output B.

[0091] (2) Damage determination and recovery rules: When AB (the relative complement of B to A) is not empty, there is damage to the light color channel included in AB, which is recorded as a damage fault of AB including the light color channel under the input A condition. The damage fault of the light color channel can be restored only when AB does not include the light color channel under the input A condition.

[0092] (3) Determine the false lighting and recovery rules: When BA (the relative complement of A to B) is not empty, there is a false lighting of the BA light color channel, which is recorded as a false lighting fault of BA including the light color channel under the input A condition. The false lighting fault of the light color channel can be restored only when BA does not include the channel under the input A condition.

[0093] The final signal light detection and analysis output data can be referenced Figure 2 .

[0094] 2. Traffic light group management and information aggregation

[0095] According to the actual engineering application environment, it is necessary to realize the aggregation of two signal light self-test data. Figure 3 . First, the traffic light transmits the self-test data to the nearest extension. The traffic lights connected to the same extension are grouped together, and the numbers of the traffic lights in the same group cannot be repeated; secondly, the extension transmits the summarized and converted traffic light self-test data to the intersection host. The intersection host can be an independent device or an extended function module of the signal control machine. Among them, the extension needs to complete the matching of the reported number of the traffic light with the received number of the signal machine, and force the conversion through the matching relationship table; the host is responsible for the maintenance of the number relationship table between the traffic light and the signal machine; the host and the extension can adopt a wired or wireless networking solution. The following introduces the extension functions and the host functions respectively:

[0096] 2-1. Extension Function

[0097] The extension is a light-end node module, responsible for communicating with (multiple) signal lights and machine-end nodes, parsing and forwarding the signal light report data and machine-end query data. The network topology of the extension is as follows: Figure 4 As shown in the figure, the internal block diagram of the extension is as follows Figure 5 As shown, the extension is powered by the host through POE.

[0098] In the extension, you need to match the signal light reporting number with the signal machine receiving number, refer to Figure 6 , forced conversion is performed by matching the relationship table.

[0099] When the extension detects that the signal light continuously outputs more than N light-off signals, the channel enters the silent state and will not be monitored subsequently; if silence is not achieved and self-test data is no longer sent, the channel enters the abnormal offline state.

[0100] 2-2. Host Function

[0101] The host is the machine-end node module, responsible for communicating with multiple light-end nodes and signal machines, parsing and forwarding the light-end reporting data and signal machine query data. The network topology diagram of the host is as follows: Figure 7 shown.

[0102] The host is responsible for maintaining the signal light-signal machine number relationship table. In the host-side settings, different extension devices are distinguished by node numbers. The relationship table fields in the host are shown in the following table:

[0103] Fields illustrate Communication Node Joint primary key, the extension number in the intersection network, A = 1-M Lamp channel number Combined primary key, the number of the signal light in the real engineering environment and extension system, X = 1-N Machine channel number The control number of the signal light in the signal system, Y = 1-64, the configuration is not unique Machine-side expansion Extension number in the signal system, used to distinguish the output relationship of one Y to many X, Z = 0-3

[0104] While forwarding the signal light self-test data reported by the extension, the host has the extension heartbeat monitoring function. After the extension stops actively reporting data for 3 seconds, it will actively query the heartbeat. If there is no reply, it is considered that the extension is offline, and the connection is actively disconnected, waiting for the extension to reconnect. When the extension is offline, its associated end channel is set to offline.

[0105] 3. Lighting and machine integrated fault detection

[0106] The signal machine accesses the signal light self-test data and connection status reported by the host to summarize the global information of the intersection and generate signal light and external line fault information with precise positioning; and based on the effective signal light operation status of all machine-side channels, extract the machine-side channel number set that currently outputs the green light for multi-channel green conflict analysis.

[0107] 3-1. Independent fault detection on the machine side

[0108] The signal control module can generate the signal light control light color of the source node, and the driver module can obtain the voltage and current values ​​of the output circuit based on its own output circuit detection function. Similar to the signal light detection and fault analysis mechanism, the driver module can obtain the external line output light color and other fault information except low-brightness faults based on the control light color and the voltage and current values ​​detected at the machine end.

[0109] In particular, by comparing the signal light control light color set I and the external line output light color set O, the simultaneous lighting fault is determined.

[0110] (1) When I≠O, and the number of O elements is greater than 1, it is recorded as an O element same-light fault (conditional same-light fault) under the control light color I; under the condition of the same control light color I, the O element is not greater than 1, and the conditional same-light fault associated with the control light color I is cleared.

[0111] (2) When a conditional simultaneous lighting fault is added, if the newly added conditional simultaneous lighting fault does not belong to the currently recorded simultaneous lighting faults, then a new simultaneous lighting fault will be added; otherwise, no new fault will be added.

[0112] (3) When a conditional simultaneous lighting fault is deleted, if there is a recorded simultaneous lighting fault that is no longer supported by the conditional simultaneous lighting fault, the simultaneous lighting fault that is not supported by the conditional simultaneous lighting fault is determined to be restored.

[0113] In summary, the data detected by the machine can be referred to Figure 8 .

[0114] 3-2. External data access and aggregation

[0115] The signal machine collects the global information of the intersection by accessing the signal light self-test data and connection status reported by the host, including: machine-side detection data, signal light self-test data, signal light connection status, host connection status, which is used to generate signal light and external line fault information with precise positioning, as shown in the following table, among which the host connection status is global data, and other information is single-channel data.

[0116]

[0117] According to the connection status of the host and the signal light, the integrated fault diagnosis of the signal light with downgrade backup function can be realized. The overall integrated fault diagnosis process of the signal light can be referred to Fig. 9 .

[0118] 3-3. Comprehensive analysis of single-channel lighting equipment

[0119] Traffic light self-test analysis is a single-channel analysis mechanism that combines machine-side detection data and traffic light self-test data. The required data and expression definitions are shown in the following table:

[0120]

[0121]

[0122] Among them, the damage / false lighting / simultaneous lighting fault in the machine-side detection data B can be regarded as the signal machine external line damage / false lighting / simultaneous lighting fault in the comprehensive judgment system of the light machine. The globally locatable fault unit topology diagram is as follows: Fig.10 As shown, it includes signal machine external line, signal light external line (extended) and signal light self-test (extended).

[0123] Step 1: Signal light self-test fault output. Compare the currently recorded damage / false lighting / low brightness fault with the damage / false lighting / low brightness fault in the signal light self-test data D. If it is not currently recorded, output the damage / false lighting / low brightness fault of the corresponding light color; if there is a damage / false lighting / low brightness fault in the current record that does not exist in the signal light self-test data D, output the damage / false lighting / low brightness fault recovery of the corresponding light color.

[0124] Step 2: Determine if the signal light self-checks and lights up at the same time. In the signal light self-check data D, input light color 1 is recorded as D1, and input light color 2 is recorded as D2. By comparing D1 and D2, that is, by comparing input light color 1 and output light color 2 in the signal light self-check data D, the signal light self-check and lights up fault can be obtained.

[0125] Step 2-1: When D1≠D2, and the number of D2 elements is greater than 1, it is recorded as a D2 element same-light fault (conditional same-light fault) under the control light color D1; under the condition of the same control light color D1, the D2 element is not greater than 1, and the conditional same-light fault associated with the control light color D1 is cleared.

[0126] Step 2-2: When a conditional simultaneous lighting fault is added, if the newly added conditional simultaneous lighting fault does not belong to the currently recorded simultaneous lighting faults, then a simultaneous lighting fault will be added, otherwise, it will not be added.

[0127] Step 2-3: When the conditional simultaneous lighting fault is deleted, if there is a simultaneous lighting fault in the current record that is no longer supported by the conditional simultaneous lighting fault, it is determined that the simultaneous lighting fault that is not supported by the conditional simultaneous lighting fault is restored.

[0128] Step 3: Determine the fault of the external line of the signal light. The control light color 1 in the machine-side detection data B is recorded as B1, and the input light color 1 in the signal light self-test data D is recorded as D1. By comparing B1 and D1, that is, by comparing the control light color 1 in the machine-side detection data B and the input light color 1 in the signal light self-test data D, the external line fault of the signal light located based on the machine-side channel number + extension number can be obtained, which is recorded as the damage fault 1 and the false light fault 2 in the signal light external line fault data E.

[0129] Step 3-1: When B1-D1 (the relative complement of D1 to B1) is not empty, there is damage to the light color channel included in B1-D1, which is recorded as a damage fault of B1-D1 including the light color channel under the condition of input B1; the damage fault of the light color channel can only be restored when B1-D1 does not include the light color channel under the condition of input B1.

[0130] Step 3-2: When D1-B1 (the relative complement of B1 to B) is not empty, there is a false lighting of the light color channel of D1-B1, which is recorded as a false lighting fault of D1-B1 including the light color channel under the input B1 condition; the false lighting fault of the light color channel can be restored only when D1-B1 does not include the light color channel under the input B1 condition.

[0131] Step 4: Interpretation of simultaneous lighting of the signal light’s external lines. Similar to Step 2, by comparing the control light color 1 in the machine-side detection data B and the input light color 1 in the signal light self-test data D, the simultaneous lighting fault of the signal light’s external lines located based on the machine-side channel number + extension number can be obtained, which is recorded as simultaneous lighting fault 3 in the signal light’s external line fault data E.

[0132] Step 5: Troubleshoot external line faults. For the machine-side channel number with extended signal light output, record the damage fault 3 and false light fault 4 in the machine-side detection data B as B3 and B4 respectively, and record the damage fault 1 and false light fault 2 in the signal light external line fault data E as E1 and E2 respectively; by comparing B3 with E1, B4 with E2, that is, by comparing the damage fault 3 / false light fault 4 in the machine-side detection data B and the damage fault 1 / false light fault 2 in the signal light external line fault data E, some external line faults can be eliminated.

[0133] Step 5-1: Damage fault elimination. For the damaged fault light color channel in B3, if there are unfaulted extended signal light outputs in multiple E1s corresponding to the same machine-side channel number, the damaged fault light color channel in B3 is eliminated.

[0134] Step 5-2: Eliminate the error-lighting fault. For the error-lighting fault light color channel in B4, if there are multiple E3s with the same machine-side channel number that have no faulty extended signal light outputs, the error-lighting fault light color channel in B4 is eliminated.

[0135] 3-4. Multi-channel green conflict analysis

[0136] According to the signal light connection status C, the valid signal light operation status data of all machine-side channels are filtered. For the machine-side channels with online status signal lights, the output light color 2 in the signal light self-test data D is taken; for the machine-side channels without online status signal lights, the external line output 2 in the machine-side detection data B is taken.

[0137] Based on the valid signal light operation status of all machine-side channels, extract the machine-side channel number set that currently outputs the green light, and determine whether there is a channel object that meets the green conflict relationship in the set. If so, output the green conflict fault, and the fault object is the machine-side channel number set. The green conflict relationship is a two-dimensional matrix pre-generated based on the intersection construction and signal light installation conditions.

[0138] 4. Lighting and machine integrated fault operation and maintenance

[0139] Through the integrated fault detection of the light and machine, the fault can be located at the signal light or the external line connected to the signal light or the external line output by the signal machine, and the operation and maintenance troubleshooting work can be advanced to the detection stage.

[0140] Through the above-mentioned single-point detection, communication conversion, integrated analysis and other technical links, the detection and fault analysis information that can be obtained is shown in the following table:

[0141]

[0142]

[0143] Its data flow and node topology are as follows Fig.11 This method can quickly detect fault types such as signal light and external line damage, false lighting, low brightness, and simultaneous lighting, and judge multi-channel green conflict faults. It can realize the positioning of multiple groups of signal light outputs, positioning of fault nodes, and single-source degradation judgment under node communication failure or detection default, which greatly reduces the difficulty and workload of operation and maintenance in complex intersection engineering environments, and meets the needs of accurate detection and rapid positioning and disposal of signal light faults.

[0144] The fault types that can be detected by the present invention include damage, false lighting, low brightness, and simultaneous lighting of the color output of multiple road lights in a single light group, as well as the green light conflict faults of the communication node connection status and the output of multiple light groups, making the fault analysis coverage more comprehensive. At the same time, through the integrated detection and analysis of signal lights, the fault can be located to the signal light, the external line connected to the signal light, and the external line output by the signal machine, and the operation and maintenance troubleshooting work can be pre-placed in the detection link, reducing the difficulty and workload of operation and maintenance, and improving the response speed of fault handling.

[0145] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated operation and maintenance method for traffic signal light fault detection, characterized in that: The method comprises the following steps: S1. Detection and fault analysis at the signal light end: The fault detection circuit at the signal light end collects the input voltage and current values ​​and the output voltage and current values ​​of each light color channel of the signal light. At the same time, the input current of each light color channel is used as the working power supply. In the case of losing the current input of all channels, the capacitor maintains normal operation for a certain period of time to distinguish abnormal power failure and light off control; S2, Traffic light group management and information aggregation: The traffic light transmits the self-test data to the near-point extension, and the extension transmits the aggregated and converted traffic light self-test data to the intersection host; wherein, the extension needs to complete the matching of the reported number of the traffic light and the received number of the signal machine, and perform forced conversion through the matching relationship table; the host is responsible for the maintenance of the number relationship table between the traffic light and the signal machine; S3, integrated fault detection of lights and machines: The signal machine collects the global information of the intersection through the self-test data and connection status reported by the access host, generates the signal light and external line fault information with accurate positioning; and based on the effective signal light operation status of all machine-side channels, extracts the machine-side channel number set that currently outputs the green light, which is used for multi-channel green conflict analysis; S4. Light and machine integrated fault operation and maintenance: through the light and machine integrated fault detection, the fault is located at the signal light or the signal light connected external line or the signal machine output external line.

2. The integrated operation and maintenance method for traffic signal light fault detection according to claim 1, characterized in that: The signal light end fault detection circuit includes a control module, a network module, a CAN module, a GPS module, a power processing module, an AC voltage and current acquisition module, an LED constant current drive module and an LED dot matrix voltage and current detection module, wherein: The power processing module is used to convert the 220V alternating current of the three red, yellow and green inputs into a stable 5V direct current for use by the control module, and also convert the 220V alternating current of the three red, yellow and green inputs into three 16V direct currents for use by the corresponding red, yellow and green LED lights; The AC voltage and current acquisition module is used to acquire the actual voltage and current of the three signal lamp inputs; The LED constant current drive module is used to provide appropriate current to the LED to adjust the brightness, and the control module can receive the brightness adjustment command of the network module and the CAN module to adjust the brightness of the signal light, and can also adjust the brightness through the time obtained by the GPS module; The LED dot matrix voltage and current detection module is used to detect the voltage and current of the three-way signal light LED when it is working, so as to judge the voltage and current of the LED lamp and the damage of some lamps, and send the status of the LED lamp in real time through the CAN bus and the network bus.

3. The integrated operation and maintenance method for traffic signal light fault detection according to claim 1 or 2, characterized in that: The signal light end detection and fault analysis method further includes: S11, the signal lamp end fault detection circuit is based on the set effective input voltage and current threshold [U A , I A ], determine the on / off of the AC-DC conversion circuit, and output the result of the light color channel input detection, where 1 indicates input and 0 indicates no input; S12, the signal lamp end fault detection circuit is based on the set effective output voltage and current threshold [U B , I B ], determine the on and off of each color LED light panel, where 1 means on and 0 means off; according to whether the output power of each color LED light panel and the standard power ratio is lower than the set low brightness threshold PL, judge whether each color LED light panel is in a low brightness state, where 1 means low brightness and 0 means normal; the low brightness state recovery requires the output power and standard power ratio to be higher than the set low brightness recovery threshold P N ; S13. By comparing the detection results of the signal light input and output, it is possible to obtain the signal light damage and false lighting fault information, wherein: The light color channel set whose input detection result is 1 in S11 is recorded as input A, and the light color channel set whose output detection result is 1 in S12 is recorded as output B; Damage determination and recovery rules: When AB is not empty, there is damage to the light color channel included in AB, which is recorded as a damage fault of the light color channel included in AB under the input A condition; the damage fault of the light color channel can only be restored if AB does not have the light color channel under the input A condition; Determine the rules for false lighting and recovery: When BA is not empty, there is false lighting of the BA light color channel, which is recorded as the false lighting fault of BA including the light color channel under the input A condition; the false lighting fault of the light color channel can only be restored when BA does not have the channel under the input A condition.

4. The integrated operation and maintenance method for traffic signal light fault detection according to claim 1, characterized in that: The S2 further includes: The extension is a signal light end node module, responsible for communicating with multiple signal lights and signal machine end nodes, and parsing and forwarding the data reported by the signal lights and the data queried by the signal machine end; the signal lights connected to the same extension are grouped together, and the signal lights in the same group are numbered to avoid duplication; The host is a signal machine end node module, responsible for communicating with multiple signal light end nodes and signal machines, and parsing and forwarding the data reported by the signal light end and the data queried by the signal machine; the host is an independent device or an extended function module of the signal control machine; The host and the extension are connected by wire or wirelessly.

5. The integrated operation and maintenance method for traffic signal light fault detection according to claim 1 or 4, characterized in that: The host has the function of monitoring the heartbeat of the extension while forwarding the signal light self-test data reported by the extension, wherein: After the extension stops actively reporting data for 3 seconds, a heartbeat query is actively performed. If the extension does not reply, the extension is considered offline and the connection is actively disconnected to wait for the extension to reconnect. When the extension is offline, the associated signal machine end channel is set to offline; When the extension detects that the signal light continuously outputs more than N light-off signals, the channel enters a silent state and stops monitoring the channel subsequently; if the silent state is not achieved, that is, the sending of self-test data is stopped, the channel enters an abnormal offline state.

6. The integrated operation and maintenance method for traffic signal light fault detection according to claim 1 or 4, characterized in that: The S3 also includes a method for independent fault detection at the signal machine end, including: A signal control module is used to generate the signal light control light color of the source node; The signal machine driving module obtains the signal light external line output light color and other fault information except the low brightness fault according to the signal light control light color and the voltage and current values ​​detected at the signal machine end.

7. The integrated operation and maintenance method for traffic signal light fault detection according to claim 6, characterized in that: The method for independent fault detection at the signal end further includes: The control light colors of the signal lights are set I, and the external line output light colors of the signal lights are set O. The simultaneous lighting fault is judged as follows: When I≠O, and the number of O elements is greater than 1, it is recorded as the O element simultaneous lighting fault under the control light color I; under the condition of the same control light color I, the O element is not greater than 1, and the conditional simultaneous lighting fault associated with the control light color I is cleared; When a conditional simultaneous lighting fault is added, if the newly added conditional simultaneous lighting fault does not belong to the currently recorded simultaneous lighting fault, then a simultaneous lighting fault is added, otherwise, no new fault is added; When the conditional simultaneous lighting fault is deleted, if there is a recorded simultaneous lighting fault that is no longer supported by the conditional simultaneous lighting fault, it is determined that the simultaneous lighting fault that is not supported by the conditional simultaneous lighting fault is restored.

8. The integrated operation and maintenance method for traffic signal light fault detection according to claim 1, characterized in that: The signal light self-test data and connection status reported by the access host in S3 are used to summarize the global information of the intersection, including: Determine the host connection status, where the host connection status is global data: If the host connection status is offline, the single-channel signal machine end is independently judged, and multi-channel green conflict judgment is performed; If the host connection status is online, the traffic light connection status is determined; if the traffic light connection status is offline, an independent judgment is made on the single-channel signal machine end, and a multi-channel green conflict judgment is performed; if the traffic light connection status is online, a comprehensive judgment is made on the single-channel light machine, and a multi-channel green conflict judgment is performed.

9. The integrated operation and maintenance method for traffic signal light fault detection according to claim 8, characterized in that: The method for comprehensive evaluation of the single-channel lamp includes: S31, signal light self-test fault output: compare the currently recorded damage / false lighting / low brightness fault with the damage / false lighting / low brightness fault existing in the signal light self-test data D, and if it is not currently recorded, output the damage / false lighting / low brightness fault of the corresponding light color; if the currently recorded damage / false lighting / low brightness fault exists in the signal light self-test data D, output the damage / false lighting / low brightness fault recovery of the corresponding light color; S32, signal light self-test simultaneous lighting judgment: record the input light color 1 in the signal light self-test data D as D1, record the input light color 2 in the signal light self-test data D as D2, and by comparing D1 and D2, obtain the signal light self-test simultaneous lighting fault based on the machine-side channel number + extension number, where: S32-1, when D1≠D2, and the number of D2 elements is greater than 1, it is recorded as a D2 element simultaneous lighting fault under the control light color D1; under the condition of the same control light color D1, the D2 element is not greater than 1, and the conditional simultaneous lighting fault associated with the control light color D1 is cleared; S32-2, when a conditional simultaneous lighting fault is added, if the newly added conditional simultaneous lighting fault does not belong to the currently recorded simultaneous lighting fault, then a simultaneous lighting fault is added, otherwise, no new fault is added; S32-3, when the conditional simultaneous lighting fault is deleted, if there is a simultaneous lighting fault currently recorded that is no longer supported by the conditional simultaneous lighting fault, determining that the simultaneous lighting fault that is not supported by the conditional simultaneous lighting fault is restored; S33, signal light external line fault analysis: record the control light color 1 in the machine end detection data B as B1, record the input light color 1 in the signal light self-test data D as D1, and by comparing B1 and D1, obtain the signal light external line fault located based on the machine end channel number + extension number, and record it as damage fault 1 and false light fault 2 in the signal light external line fault data E, where: S33-1, when B1-D1 is not empty, there is damage to the light color channel included in B1-D1, which is recorded as a damage fault of the light color channel included in B1-D1 under the condition of input B1; the damage fault of the light color channel can only be restored when B1-D1 does not include the light color channel under the condition of input B1; S33-2, when D1-B1 is not empty, there is a false light on of the light color channel of D1-B1, which is recorded as a false light on fault of D1-B1 including the light color channel under the condition of input B1; the false light on fault of the light color channel can be restored only when D1-B1 does not include the light color channel under the condition of input B1; S34, simultaneous lighting judgment of signal light external lines: by comparing the control light color 1 in the machine-side detection data B and the input light color 1 in the signal light self-test data D, the simultaneous lighting fault of the signal light external lines located based on the machine-side channel number + extension number is obtained, which is recorded as simultaneous lighting fault 3 in the signal light external line fault data E; S35, external line fault elimination: For the machine channel number with extended signal light output, record the damaged fault 3 and the erroneous light fault 4 in the machine detection data B as B3 and B4, and record the damaged fault 1 and the erroneous light fault 2 in the signal light external line fault data E as E1 and E2; by comparing B3 with E1, B4 with E2, some external line faults can be eliminated, among which: S35-1, Damage fault elimination: For the damaged fault light color channel in B3, if there are unfaulted extended signal light outputs in multiple E1s corresponding to the same machine-side channel number, the damaged fault light color channel in B3 is eliminated; S35-2. Troubleshooting of erroneous lighting faults: For the erroneous lighting fault light color channel in B4, if there are non-faulty extended signal light outputs in multiple E3s corresponding to the same machine-side channel number, the erroneous lighting fault light color channel in B4 is eliminated.

10. The integrated operation and maintenance method for traffic light fault detection according to claim 9 or 1, characterized in that: The multi-channel green conflict analysis method includes: Filter the valid signal light operation status data of all machine-side channels according to the signal light connection status C: For the machine-side channel with an online status signal light, take the output light color 2 in the signal light self-test data D; For the machine-side channel without online status signal light, take the external line output 2 in the machine-side detection data B; Based on the operating status of the valid signal lights of all machine-side channels, extract the machine-side channel number set that currently outputs the green light, and determine whether there is a channel object that meets the green conflict relationship in the set. If so, output a green conflict fault, and the fault object is the machine-side channel number set.

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