CN116844363A - Traffic signal lamp self-adaptive fault judging method - Google Patents
Traffic signal lamp self-adaptive fault judging method Download PDFInfo
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Abstract
The application discloses a traffic signal lamp self-adaptive fault judging method. In order to solve the problems that the existing traffic signal lamp fault judging mode is low in accuracy and can not realize accurate and efficient detection of the countdown signal lamp faults, the application comprises the steps that an upper computer regularly acquires a plurality of voltage and current value lists of each preset intersection lamp control loop when no fault exists, and then sends a storage instruction to a signal machine; the singlechip of the signal machine receives the storage instruction and writes the list into the singlechip and uses the list as a reference comparison table; the annunciator acquires real-time voltage and current values of each lamp control loop in real time, records the values as a real-time sampling list, and respectively carries out fault judgment according to the type of each lamp control loop. The traditional longitudinal static threshold comparison mode of single loop voltage and current absolute value is skipped; the establishment of the comparison table is judged from multiple dimensions, so that the accuracy of detecting the faults of the traffic lights is greatly improved, and the method has obvious advantages in a fault judging mode of the traffic signal lights with countdown functions.
Description
Technical Field
The application relates to the technical field of signal lamp fault judgment of traffic intersection real-time operation, in particular to a traffic signal lamp self-adaptive fault judgment method.
Background
Today, the serious faults of traffic intersection signal lamps are mainly divided into two types of signal lamps, namely, the signal lamps are not bright and are bright red, yellow, green and the like. Common causes of failure are in the device failure of the signal itself, in the cable failure of the signal to connect to the signal, or in the signal device failure. Most of the existing annunciator manufacturers commonly develop a lamp control recheck function, so that the faults of the signal lamp that the signal lamp is not bright, red, yellow, green and bright can be detected in real time in design, and degradation yellow flashing is realized. However, because the electric condition of the traffic intersection is increasingly complex, when the voltage of the intersection power grid is unstable and the connecting cable is overlong, the induced voltage fluctuation still can be caused, and the problem of fluctuation of short-time voltage and current still can be caused by the yellow lamp explosion flash lamp, so that the detection accuracy of the actual intersection signal machine lamp control recheck fault is often not very high. The light control rechecking structure of the annunciator is either sensitive, namely, the annunciator alarms yellow flash as soon as the voltage fluctuates; or too late, i.e. the signal lamp has failed for a long time, the lamp control rechecking module does not react for a long time. The root cause is that most of the judging methods of the recheck faults of the annunciators are only made based on single anomalies of the voltage and the current of the signal lamp of the same line, wherein the anomalies refer to that the voltage, the current or the power is smaller than a preset static threshold value. It is the threshold value that is set statically in advance that causes false detection of the lamp control review module.
The prior traffic signal lamp is commonly known to adopt an LED lamp, and in order to keep the brightness constant, the LED traffic signal lamp group is driven by adopting a constant current design, but under the design, the fluctuation of the voltage at the intersection also causes the fluctuation of the loop current of the signal lamp. Through testing, the circuit current of 220V of the power grid is about 35% smaller than that of 176V of the round disc lamp of the common motor vehicle without countdown of the existing signal lamp manufacturer, and if the voltage is continuously reduced to be near 170V, the circuit current is further reduced to be more than 40%. In the peak period of the electricity consumption in summer, the condition that the voltage of the power grid at the traffic intersection is reduced to 170V generally occurs, the actual measurement of the voltage of the power grid at the individual intersection is even reduced, and the alternating current of the corresponding signal lamp loop is also reduced at the same time. Under the application scene, the static threshold adopted in the signal machine rechecking function is obviously unsuitable, so that false alarm of fault detection caused by the static threshold is unavoidable.
In addition, the signal lamp at the current intersection basically has a countdown function except for the basic red, green and yellow lamps. The known down-time signal lamp has five hardware independent lamps: red light, yellow light, green light, red light countdown light and green light countdown light. The three lamps of the red light, the yellow light and the green light are directly controlled by the annunciator, the red light countdown lamp and the green light countdown lamp are controlled by an internal singlechip, and the power supply of the singlechip is provided by three voltages of red, yellow and green through bridge stacks, rectification and switching power supply. The singlechip program learns the phase period of the annunciator by detecting the corresponding starting and ending moments of the red, yellow and green alternating voltages, and triggers the countdown digital display by combining the countdown pulse provided by the annunciator. The circuit principle of the countdown signal lamp can show that the singlechip works as long as three paths of alternating currents of red, yellow and green are powered on, no matter whether the countdown is started or not or even the LED lamp group is faulty, the singlechip hardware module can generate current, and the current generated by the singlechip is in an order of magnitude with the current lighted by the LED lamp group. The total current of the signal lamp is detected from the signal machine side, but the current generated when the LED lamp group is lighted can not be distinguished, and the current generated by the hardware circuit of the singlechip is not distinguished. Therefore, the current generated by the singlechip hardware module is confusing to the recheck circuit of the signal machine side, on one hand, the signal machine lamp control driving module can not know whether the output is actually connected with a signal lamp without countdown or a signal lamp with countdown, on the other hand, the common signal lamp is divided into a plurality of minutes, a disc signal lamp, an arrow signal lamp and the like, and different common signal lamps generate different loop currents due to different numbers of LED lamp groups and different specification parameters of a transformer; similarly, the countdown signal lamps are also classified into a plurality of types, including disc countdown lamps, arrow countdown lamps, pedestrian countdown lamps and the like, and the current of the single chip microcomputer and the loop current of the lamp set are different. This significant difference in the loop currents of the different signal lamps makes the static threshold setting of the recheck module on the signal side unproblematic, resulting in an accurate detection of the recheck module failure.
For example, the application discloses an automatic detection method and circuit for a fault threshold value of a traffic signal lamp in China patent literature, and the publication number CN105374222B of the automatic detection method is an automatic test method for electrical parameters of the traffic signal lamp, and is generally carried out when detecting parameters of a certain type of traffic signal lamp. The current threshold obtained by the method is somewhat biased as the fault judgment of the signal lamp, because, firstly, the method is not accurate enough to obtain the current threshold, and only the low voltage threshold when the signal lamp is turned off can be accurately measured, and the low current threshold cannot be accurately obtained.
Disclosure of Invention
The primary purpose of the application is to solve the problem of low accuracy of the existing traffic signal lamp fault judging mode; the secondary purpose of the application is to solve the problem that the existing traffic signal lamp fault judging structure can not realize accurate and efficient detection of the countdown signal lamp fault; the application provides a traffic signal lamp self-adaptive fault judging method, which comprises the steps of establishing a voltage-current reference list of a lamp control loop when an intersection signal lamp works without faults, and comparing alternating voltage and current effective values detected by the lamp control loop in real time with data signals in the reference list and judging faults; in the fault judging process, the difference value judgment of the real-time current and the reference current of the lamp control loop, the comparison judgment of the current of the signal lamp loop of the same type at the same intersection, the comparison judgment of the current of the red lamp loop and the yellow lamp loop in opposite directions are combined, and the real-time judgment of the voltage value of the power grid at the intersection is combined, so that the accurate fault judgment of various signal lamps is finally realized.
The technical problems of the application are mainly solved by the following technical proposal:
the application comprises the following steps: the upper computer regularly acquires a plurality of voltage and current value lists of each preset intersection lamp control loop when no fault exists, and then sends a storage instruction to the annunciator; after receiving the storage instruction, the singlechip of the signal machine writes the list into the flash memory of the singlechip and uses the list as a reference comparison table; the signal machine acquires real-time voltage and current values of each lamp control loop in real time, records the real-time voltage and current values as a real-time sampling list, and respectively carries out fault judgment according to the type of each lamp control loop; the light control loop types include, but are not limited to, red, yellow, and countdown signal light control loops. The reference voltage-current meter of the fault-free signal lamp which normally operates at the actual intersection is used as a reference comparison table to judge the fault of the signal lamp, and the method for judging the fault by comparing independent and longitudinal static thresholds of the absolute values of the voltage and the current of the traditional single lamp control loop is jumped out; the multi-dimensional comparison of the application can be combined with the establishment of the self-adaptive reference voltage-current meter, so that the accuracy of detecting the faults of the traffic lights can be greatly improved, and the application has obvious advantages in the fault judging mode of the traffic lights with countdown function.
Preferably, the lamp control loop is embedded with a detection circuit of alternating voltage and alternating current; the singlechip of the signal machine in the lamp control loop calculates the effective values of the voltage and the current in the lamp control loop in real time through ADC, a timer and a DMA technology. By setting the time for detecting the voltage and the current, the uniformity of sampling the voltage and the current is realized, the accuracy of the obtained voltage and the current sample is better ensured, and all pieces of data are not interfered with each other.
Preferably, the singlechip collects the voltage and current values in the lamp control loop once every T microseconds, calculates the effective values of the voltage and current in T/10 milliseconds after accumulated sampling for N times, and temporarily stores the corresponding relationship between the voltage and the current and the data into a voltage and current value list of the loop. The voltage and current samples of the lamp control loop are sampled at regular intervals within 20ms of one period of the alternating voltage in a circulating manner, the effective values of the alternating voltage and the current are calculated, and the corresponding current values are temporarily stored in a loop voltage-current list in a memory according to the voltage, so that the corresponding current values can be conveniently searched according to the values of the required voltages in the subsequent comparison process.
Preferably, the upper computer acquires a voltage and current value list with the maximum sample capacity when the lamp control loop is fault-free, and then issues a storage instruction; after receiving the storage instruction, the singlechip processes and correlates the voltage and current value lists of each loop, writes the voltage and current value lists into the flash memory flash, and records the voltage and current value lists as a reference comparison table. The upper computer platform of the annunciator regularly acquires voltage-current data and a list of each lamp control loop of the intersection annunciator in a normal operation time period of each loop, so that the advisability and the accuracy of a reference comparison table of a flash to be written in later can be ensured; after enough samples are obtained, under the condition that the operation of the intersection signal lamp is checked and ensured to be fault-free and the fluctuation of sampling values corresponding to the voltage and the current of each lamp control loop tends to be stable, a storage instruction is sent again, and the writing of the comparison table is realized. The establishment or updating of the voltage-current reference comparison table of the normal running fault-free signal lamp control loop of the actual intersection can be carried out when the signal lamp is installed, or can be carried out after the signal lamp runs for a period of time or a longer time, and the signal lamp is initiated by an upper computer platform, so that the reference comparison table also has updatability.
Preferably, the real-time voltage and current effective values of the lamp control loop are obtained during the normal operation of the signal lamps at each intersection and are recorded as a real-time sampling list; and respectively comparing the reference voltage and reference current data in the real-time sampling list and the reference comparison table according to the type of the lamp control loop, so as to realize fault judgment. The general applicability of the method and the suitability of the method for most lamp control loop setting schemes can be enhanced by comparing the data in the two tables according to different inspection standards, and the specific fault judgment can be flexibly completed according to a preset judgment flow.
Preferably, the fault determination comprises basic loop data determination, and the single loop real-time sampling list is compared with the effective values of voltage and current in the reference comparison table; if the effective value of the loop current is smaller than the reference current in the reference comparison table under the same voltage and the difference value is larger than the preset basic difference value percentage, judging that the signal lamp in the loop is faulty, otherwise, judging that the signal lamp is normal. When the signal lamp is turned off, the drop amplitude of the loop current is more than 50%, the preset basic difference percentage is used for measuring the data difference value of the two tables, and is also a reference for judging the signal lamp fault, if the difference value between the effective value of the loop current and the reference current value is within the preset percentage, the difference value of the two data is not large, however, once the difference value exceeds the preset percentage, the difference value of the two data is large, namely the fault is certain, and the set percentage is 40%.
Preferably, the fault determination includes a same-reference loop data determination, wherein the same-reference loop data determination includes loop current at the same intersection, the same type of signal lamp or the last phase point; if the loop current meeting at least one of the conditions is smaller than the value of the reference current under the same type of voltage in the reference comparison table and the difference value is larger than the preset percentage of the same reference difference value, judging that the signal lamp of the loop is faulty, otherwise, judging that the signal lamp is normal. For the same type of signal lamp at the same intersection or the signal lamp at the same phase position when the signal lamp is lighted, the phase difference of a loop circuit is very small, and the actual test at the intersection proves that the set percentage is 35%; therefore, the preset percentage is used as a current difference value measurement standard in the current loop current and reference comparison table, so that accurate fault judgment is carried out; note that, the reference table also stores the signal lamp reference currents on the same type, same loop or the last phase, so that an accurate determination result can be obtained by comparison.
Preferably, the fault determination comprises a color signal lamp loop data determination, and the color signal lamp comprises, but is not limited to, a red light or a yellow light; in the lamp control loop of the red lamp, comparing the current of the red lamp loop with the reference current of a yellow lamp loop of a lighting lamp of a phase on the same lamp group, and if the current of the red lamp loop is smaller and the difference value is larger than a preset difference value percentage, judging that the red lamp of the loop signal has a red lamp fault; in the lamp control loop of the yellow lamp, comparing the current of the yellow lamp loop with the reference current of the red lamp loop of the bright lamp of one phase on the same lamp group, and if the current of the yellow lamp loop is smaller and the difference value is larger than the preset difference value percentage, judging that the yellow lamp of the loop signals has faults; and in the same way, the judgment process of the lamp control loop of the green lamp is obtained, and the actual percentage design of the green lamp and the judgment process can be obtained through actual verification. Wherein the loop current of the red light and the yellow light is about 10 percent different, and the set percentage is about 30 percent; according to the obtained verification result, the judgment results of the yellow light and the red light signal lamp can be measured by the set percentage, and the accuracy of fault judgment is ensured.
Preferably, the fault determination includes a countdown signal lamp loop data determination, and in the recording process of the reference voltage and the reference current of the countdown signal lamp, the reference voltage and the reference current corresponding to each countdown number should be recorded in detail in a reference table, and if the current before the beginning of the countdown and the current at the time t after the beginning of the countdown have no change or the change value is smaller than a set threshold value, the fault of the countdown signal lamp is determined. For example, the current at countdown 8 is about 15% greater than the current at countdown digital display at front 11, 10, which is the set percentage bit of 10%; according to the actual verification result, the timing signal lamp is used as a reference for verifying whether the timing signal lamp is in fault or not; for the countdown signal lamp, the scheme compares the voltage current values corresponding to each number, and the corresponding judgment basis is also needed to be obtained according to the characteristics of the red light countdown and the green light countdown, so that the judgment accuracy of all the countdown signal lamps is sequentially improved.
The beneficial effects of the application are as follows:
the application relates to a traffic signal lamp self-adaptive fault judging method, which comprises the following steps: the attenuation change of the electric parameters of the signal lamp after the signal lamp runs for a long time, such as brightness darkening, loop current becoming small and the like, is fully considered through a step-by-step, multidimensional and dynamic self-adaptive fault judgment algorithm, so that the wide practicability of the scheme can be ensured as much as possible; compared with other methods mentioned in the prior patents and published articles in the field, the scheme of the application has the characteristics of novel innovation, wide coverage, good expandability and maintainability and the like. The method has very important practical significance in solving the problem of accuracy of fault detection of the traffic intersection signal lamp, and is worthy of large-scale popularization.
Drawings
FIG. 1 is a schematic diagram of a traffic signal light control loop of a traffic signal adaptive fault determination method of the present application;
FIG. 2 is a schematic diagram of a lamp control loop current detection module of a traffic signal adaptive fault determination method according to the present application;
FIG. 3 is a schematic diagram of a lamp control loop voltage detection module of a traffic signal adaptive fault determination method according to the present application;
FIG. 4 is a schematic diagram of a traffic signal adaptive fault determination method of the present application;
fig. 5 is a signal lamp failure determination flow chart of a traffic signal lamp adaptive failure determination method of the present application.
Detailed Description
The technical scheme of the application is further specifically described below through examples and with reference to the accompanying drawings.
Examples:
the adaptive fault determination method for traffic signal lamp of this embodiment, as shown in fig. 4, includes: the upper computer regularly acquires a plurality of voltage and current value lists of each preset intersection lamp control loop when no fault exists, and then sends a storage instruction to the annunciator; after receiving the storage instruction, the singlechip of the signal machine writes the list into the flash memory of the singlechip and uses the list as a reference comparison table; the signal machine acquires real-time voltage and current values of each lamp control loop in real time, records the real-time voltage and current values as a real-time sampling list, and respectively carries out fault judgment according to the type of each lamp control loop; the light control loop types include, but are not limited to, red, yellow, and countdown signal light control loops.
Wherein, the lamp control loop is embedded with a detection circuit of alternating voltage and alternating current; the singlechip of the signal machine in the lamp control loop calculates the effective values of the voltage and the current in the lamp control loop in real time through ADC, a timer and a DMA technology. The single chip microcomputer collects the voltage and current values in the lamp control loop once every 200 microseconds, calculates the effective values of the voltage and current in 20 milliseconds after accumulated sampling for 10 times, and temporarily stores the corresponding relationship between the voltage and the current and the data into a voltage and current value list of the loop. The upper computer acquires a voltage and current value list with the maximum sample capacity when the lamp control loop is fault-free, and then issues a storage instruction; after receiving the storage instruction, the singlechip processes and correlates the voltage and current value lists of each loop, writes the voltage and current value lists into the flash memory flash, and records the voltage and current value lists as a reference comparison table.
As shown in fig. 1, the alternating current 22V is divided into three paths on the signal machine side after being input, and is respectively connected with a thyristor in sequence, and is connected with a lamp control loop current detection module and is connected with a signal red, green or yellow lamp; the two ends of the current detection module are connected with the alternating voltage detection module in parallel and are used for detecting alternating voltage and alternating current data in real time and used as reference data or data for real-time judgment.
As shown in fig. 2 and 3, the voltage detection module of the lamp control loop mainly comprises an ac transformer, the input end of the ac transformer is respectively connected with an ac 22V input and a zero line, the output end of the ac transformer is connected with an amplifier, and the output end of the amplifier is connected to the input end of the single chip microcomputer ADC. The current detection module of the hearing lamp control loop also consists of an alternating current transformer, the input ends of the current detection module are respectively connected with the two ends of the control loop and are connected in parallel with the control loop, and the output ends of the current detection module are connected with the input ends of the single chip microcomputer ADC through an amplifier.
Alternating voltage and loop current ADC sampling process: the timer triggers ADC sampling, and sampling data is stored into a designated address through DMA after ADC sampling is completed. The timer period is 20us, and when the ADC sequentially samples the voltage and the current of each phase of the red, yellow and green light control loops for 100 times, the program calculates the effective values of the alternating voltage and the loop current of each loop in the output phase of the current annunciator. After the calculation is completed, the ADC returns to continue the next round of sampling, and the program can update the effective values of the voltages and the currents of all loops in real time.
The electric environment of the traffic intersection is very complex, the high temperature, the condensation, the fluctuation of the power grid and the like are different, and the traffic equipment installed at the intersection can not avoid faults when running for a long time. Because of the specificity of the traffic signal lamp, whether the traffic signal lamp is safe or not directly influences the safety of vehicles and pedestrians. Therefore, the method can detect the faults of the traffic signal lamp timely, quickly and accurately, and has very important practical significance. In the embodiment, the real-time voltage and current effective values of the lamp control loop are obtained when the signal lamps at each intersection are in normal operation and are recorded as a real-time sampling list; the reference voltage and reference current data in the real-time sampling list and the reference comparison list are respectively compared according to the type of the lamp control loop, so that the fault problems of the signal lamp, such as the lighting failure, the lighting failure of the red and green lamps, the lighting failure of the no-fault lamp and the like, are solved, and the fault problems are basically caused by the reasons of the fault of the lamp control circuit of the signal lamp, the fault of the equipment of the signal lamp, the fault of the direct cable of the signal lamp and the like. The judgment of the faults of the signal lamp equipment is the most complex, because the signal lamps are too many in types, including disc lamps, arrows and the like, pedestrian lamps, non-motor vehicle lamps and the like, some lamps have countdown, some lamps do not have countdown, and when the lamps of different types are lighted, the loop currents are different due to the different numbers of LEDs: the common signal lamp without countdown has small loop current when the lamp fails; when the lamp is in fault, the loop current is larger, and the large current is actually generated by a singlechip hardware module in the countdown signal lamp, and has a size which is even different from that of a certain common lamp without countdown when the lamp is lighted. Considering the voltage fluctuation of the actual traffic intersection, the factors make it very difficult to accurately judge the fault of the signal lamp on the side of the traffic light control loop.
In view of the dilemma faced by the fault detection of the lamp control loop, the application provides a self-adaptive fault detection and judgment method of the lamp control loop. Based on the following scene description: in general, a traffic intersection must be provided with a plurality of signal lamps: the small crossing is generally one of four inlets of southeast, northwest and southwest, 4 motor vehicle lamps are all arranged, and 8 pedestrian lamps are arranged; the large crossing is generally composed of 12 motor vehicle lamps on the left, right and left sides of the north and south, and 8 pedestrian lamps. According to the requirements of the traffic flow direction of the crossing, the types of motor vehicle signal lamps corresponding to the flow direction are the same, for example, a disc lamp is arranged at an east inlet, a disc lamp is also arranged at a Naxi inlet, for example, an arrow lamp is arranged at an east left, and an arrow lamp is also arranged at a Naxi left; of course, the model of 8 people's lights should be the same. That is, the same intersection must have different types of signal lamps, and the number of the signal lamps of the same type is more than one. In addition, according to the electrical characteristics of the red LED lamp and the yellow LED lamp, the loop current of the red lamp is basically the same as the loop current of the yellow lamp under the premise of the same brightness, and the motor vehicle disc lamp loop voltage and current comparison table with countdown is not provided in the table 1.
Table 1 motor vehicle disc lamp circuit voltage and current comparison table without countdown
Based on the actual installation rule of the traffic intersection signal lamps, it can be considered that the ac input voltages of the signal lamps at the same intersection and at the same time are the same, so that the loop currents of the signal lamps of the same type when the same lamp color is lighted can be mutually referred, and the loop currents of the red lamps and the yellow lamps in the same lamp group when the respective lamps are lighted can also be mutually referred. Therefore, on one hand, traffic intersection annunciators are diversified in type, but on the other hand, the types of corresponding import signal lamps are consistent to a certain degree. According to the characteristics, the application provides a traffic intersection lamp control loop fault self-adaptive detection and judgment method. The method combines the judgment of the difference value between the real-time current and the normal working reference current, the comparison judgment of the loop current of the signal lamp of the same type, the comparison judgment of the loop currents of the red lamp and the yellow lamp of the same lamp group, and the judgment of the electric parameter value corresponding to the real-time intersection power grid voltage value. The algorithm for multi-dimensional comparison and judgment and threshold judgment can greatly improve the fault detection accuracy of the pilot-controlled loop of the annunciator.
The overall design concept of the method is that the lamp control rechecking is based on real-time voltage and current detection, a voltage-current reference list is established under the assistance of an upper computer platform when an actual intersection signal lamp control loop operates without faults, and fault judgment is combined with reference current difference judgment of real-time current and normal operation, comparison judgment of the same type of signal lamp loop current, comparison judgment of red lamp and yellow lamp loop current of the same lamp group and judgment of an electrical parameter value corresponding to a real-time intersection power grid voltage value. The method has the greatest characteristic that the traditional method for judging the faults by comparing the longitudinal static threshold values of the absolute values of the voltage and the current of the single loop is skipped. The multidimensional comparison of the application can greatly improve the accuracy of detecting the faults of the traffic lights by combining with the establishment of the self-adaptive reference voltage-ammeter, and has obvious advantages especially for judging the faults of the traffic lights with countdown function.
To determine whether a traffic signal has a fault, the voltage and current of the lamp control loop are obtained in real time. There is one basic logic: 1. if the lamp control loop does not have current, the signal lamp affirms to be turned off; 2. if the lamp control loop has no voltage, the signal lamp affirms to be turned off; 3. the signal lamp lighting must satisfy two conditions: the lamp control loop has a voltage and the loop current is greater than a set threshold. The difficulty in accurately determining whether a signal is lit or lit is that this set threshold is poorly defined, because the signal is too many types. There are disc lamps, arrows, etc., pedestrian lamps, non-motor vehicle lamps, some of which have countdown, some of which do not have countdown, and the loop current is different when the lamps of different types are lit.
It should be noted that: when a common signal lamp without countdown is in fault, the loop current is very small, and the current is actually no-load current of the primary side of a transformer in the signal lamp, and is generally less than 5mA, as shown in Table 2; when the lamp is in fault, the loop current is larger because the current generated by the singlechip hardware module for controlling the countdown in the lamp is equal to the current, and no matter the lamp is on or off, the additional current always exists unless the red, yellow and green lamps in the same lamp group are all powered off. This additional current is typically not less than 10mA, as in table 3, which may be different for different types of countdown lamps. In addition, in the case of a down signal lamp, the loop current varies, typically by 15% or more, before the start of the down and after the start of the down.
Table 2 comparison table of loop voltage and current during normal and fault of motor vehicle disc lamp without countdown
Table 3 comparison table for loop voltage and current during normal and fault of motor vehicle disc lamp with countdown
The lamp failure test environments of tables 2 and 3 are: the lamp control loop is electrified, and the secondary side of the transformer in the lamp panel is disconnected to simulate the fault lamp-extinguishing condition of the LED lamp group. As can be seen from the experimental records of the table, the loop current values of the red light and the yellow light are similar when the lamp is normally lighted, and the loop current of the green light is about 25% smaller; when the signal lamp without the countdown is out of order, the loop current can be greatly reduced, and the reduction reaches more than 90 percent (220V); when the down-time signal lamp fails, the drop amplitude of the loop current is only about 55 percent (220V).
A determination is made as to whether each loop is faulty based on a dynamic, multi-dimensional comparison of the desired output state of the loop and the actual measured effective values of voltage and current of the loop for the present phase scheme. Firstly, a singlechip real-time lamp samples the effective values of alternating voltage and current of a lamp control loop, and temporarily stores the corresponding current value in a loop voltage-current list in a memory according to the voltage, and a signal machine upper computer platform periodically acquires a voltage-current real-time sampling value list of each lamp control loop of an intersection signal machine; after a certain number of samples are obtained, under the condition that the normal operation of the intersection signal lamp is checked and ensured, and the fluctuation of sampling values corresponding to the voltage and current of each lamp control loop tends to be stable, the upper computer platform sends a storage instruction, and after receiving a command, the singlechip writes a voltage and current sampling list of each lamp control loop into the singlechip flash. The list is used as a reference table of voltage-current of a lamp control loop when the specific signal lamp at the intersection works normally, and the reference list can be updated irregularly according to the requirement.
Acquiring real-time voltage and current effective values of a lamp control loop when the signal lamps at each intersection normally run, and recording the effective values as a real-time sampling list; and respectively comparing the reference voltage and reference current data in the real-time sampling list and the reference comparison table according to the type of the lamp control loop, so as to realize fault judgment. The method comprises basic loop data judgment, same reference loop data judgment, color signal lamp loop data judgment and countdown signal lamp loop data judgment.
In the process of judging basic loop data, comparing the single loop real-time sampling list with the voltage and current effective values in the reference comparison table; if the effective value of the loop current is smaller than the reference current in the reference comparison table under the same voltage and the difference value is larger than the preset basic difference value percentage, judging that the signal lamp in the loop is faulty, otherwise, judging that the signal lamp is normal.
In the same reference loop data judging process, the same reference comprises loop current at the same intersection, the same type of signal lamp or the last phase; if the loop current meeting at least one of the conditions is smaller than the value of the reference current under the same type of voltage in the reference comparison table and the difference value is larger than the preset percentage of the same reference difference value, judging that the signal lamp of the loop is faulty, otherwise, judging that the signal lamp is normal.
In the color signal lamp loop data determination process, color signal lamps include, but are not limited to, red lamps or yellow lamps; in the lamp control loop of the red lamp, comparing the current of the red lamp loop with the reference current of a yellow lamp loop of a lighting lamp of a phase on the same lamp group, and if the current of the red lamp loop is smaller and the difference value is larger than a preset difference value percentage, judging that the red lamp of the loop signal has a red lamp fault; and the judgment process of the lamp control loop of the yellow lamp and the green lamp is obtained in the same way.
In the process of determining the data of the countdown signal lamp loop, in the process of recording the reference voltage and the reference current of the countdown signal lamp, the reference voltage and the reference current corresponding to each countdown number are recorded in detail in a reference comparison table, and if the current before the countdown and the current at the time t after the countdown are started have no change or the change value is smaller than a set threshold value, the countdown signal lamp fault is determined.
As shown in fig. 5, the detailed procedure of the failure determination is as follows:
after the setting work of the reference voltage and the current is completed, the real-time judgment of the fault of the signal lamp can be started. According to the phase scheme of the signal machine operated at the current stage, the judgment of the signal lamp fault is divided into two cases: in the phase scheme executed by the signal machine at the present stage, the lamp control loop has no voltage output, and the signal lamp is in a lamp-off state:
if the actually detected loop voltage is smaller than the set threshold value or the loop current is not larger than the reference current by a set percentage, the lamp control loop is normal, and the corresponding signal lamp works normally; (this set percentage is typically around 30%);
if the actually detected loop voltage is larger than a set threshold value and the loop current is larger than a set percentage of the reference current, the lamp control loop is abnormal, and the corresponding signal lamp is lightened without any fault; (this set percentage is typically around 50%);
if the actually detected loop voltage is greater than the set threshold value and the effective value of the loop current is smaller than the set percentage of the reference current, but the loop current of another lamp of the lamp group exceeds the set percentage (about 30%) of the reference current, the lamp control loop is abnormal, and the signal lamp is not turned on (simultaneously turned on).
In the phase scheme executed by the signal machine at the present stage, the lamp control loop has voltage output, and the signal lamp is in a lighting state:
1) Judging whether the loop current is smaller than the reference current under the voltage and whether the difference is larger than a set percentage or not, and judging the loop fault; (this set percentage is typically around 50%);
comparing the loop current of the same type of signal lamp at the intersection when the current or the last phase is lighted, and judging the loop fault if the loop current is smaller than the same type of value and the difference value is larger than a set percentage; (this set percentage is typically around 40%);
if the current of the red (yellow) lamp loop is smaller than the value of the last reference object and the difference is larger than a set percentage, the loop fault is judged; (this set percentage is typically around 30%);
countdown signal lamp: if the current before the countdown starts and the current after the countdown starts do not change or the change value is smaller than the set percentage, the countdown lamp fails.
In summary, the determining method of the embodiment establishes the voltage-current reference list of the lamp control loop when the intersection signal lamp works without faults, and compares the ac voltage and the current effective value detected by the lamp control loop in real time with the data signals in the reference list and determines faults; in the fault judging process, the difference value judgment of the real-time current and the reference current of the lamp control loop, the comparison judgment of the current of the signal lamp loop of the same type at the same intersection, the comparison judgment of the current of the red lamp loop and the yellow lamp loop in opposite directions are combined, and the real-time judgment of the voltage value of the power grid at the intersection is combined, so that the accurate fault judgment of various signal lamps is finally realized.
The attenuation change of the electric parameters of the signal lamp after the signal lamp runs for a long time, such as brightness darkening, loop current becoming small and the like, is fully considered through a step-by-step, multidimensional and dynamic self-adaptive fault judgment algorithm, so that the wide practicability of the scheme can be ensured as much as possible; compared with other methods mentioned in the prior patents and published articles in the field, the scheme of the application has the characteristics of novel innovation, wide coverage, good expandability and maintainability and the like. The method has very important practical significance in solving the problem of accuracy of fault detection of the traffic intersection signal lamp, and is worthy of large-scale popularization.
It should be understood that the examples are only for illustrating the present application and are not intended to limit the scope of the present application. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the teachings of the present application, and such equivalents are intended to fall within the scope of the application as defined in the appended claims.
Claims (9)
1. A traffic signal lamp adaptive fault determination method, comprising:
the upper computer regularly acquires a plurality of voltage and current value lists of each preset intersection lamp control loop when no fault exists, and then sends a storage instruction to the annunciator; after receiving the storage instruction, the singlechip of the signal machine writes the list into the flash memory of the singlechip and uses the list as a reference comparison table; the signal machine acquires real-time voltage and current values of each lamp control loop in real time, records the real-time voltage and current values as a real-time sampling list, and respectively carries out fault judgment according to the type of each lamp control loop; the light control loop types include, but are not limited to, red, yellow, and countdown signal light control loops.
2. The adaptive fault determination method for traffic lights according to claim 1, wherein the detection circuit for ac voltage and ac current is embedded in the light control loop; the singlechip of the signal machine in the lamp control loop calculates the effective values of the voltage and the current in the lamp control loop in real time through ADC, a timer and a DMA technology.
3. The adaptive fault judging method of traffic signal lamp according to claim 2, wherein the single chip microcomputer collects the voltage and current values in the lamp control loop every T microseconds, calculates the effective values of the voltage and current in T/10 milliseconds after accumulated sampling for N times, and stores the corresponding relationship between the voltage and current and the data in the voltage and current value list of the loop temporarily.
4. The traffic light self-adaptive fault judging method according to claim 1 or 3, wherein the upper computer acquires a voltage and current value list with the maximum sample capacity when the light control loop is fault-free and then issues a storage instruction; after receiving the storage instruction, the singlechip processes and correlates the voltage and current value lists of each loop, writes the voltage and current value lists into the flash memory flash, and records the voltage and current value lists as a reference comparison table.
5. The traffic light adaptive fault judging method according to claim 1 or 2, wherein the real-time voltage and current effective values of the light control loop are obtained and recorded as a real-time sampling list when each intersection signal light is in normal operation; and respectively comparing the reference voltage and reference current data in the real-time sampling list and the reference comparison table according to the type of the lamp control loop, so as to realize fault judgment.
6. The traffic light adaptive fault determination method according to claim 5, comprising the steps of determining basic loop data, and comparing a single loop real-time sampling list with voltage and current effective values in a reference comparison table; if the effective value of the loop current is smaller than the reference current in the reference comparison table under the same voltage and the difference value is larger than the preset basic difference value percentage, judging that the signal lamp in the loop is faulty, otherwise, judging that the signal lamp is normal.
7. The adaptive fault determination method of a traffic light according to claim 5, comprising determining same-reference loop data, wherein the same-reference loop data comprises loop current at the same intersection, same-type signal lamp or at the same phase; if the loop current meeting at least one of the conditions is smaller than the value of the reference current under the same type of voltage in the reference comparison table and the difference value is larger than the preset percentage of the same reference difference value, judging that the signal lamp of the loop is faulty, otherwise, judging that the signal lamp is normal.
8. The traffic light adaptive fault determination method of claim 5, comprising a color light loop data determination, the color light including but not limited to red or yellow light; in the lamp control loop of the red lamp, comparing the current of the red lamp loop with the reference current of a yellow lamp loop of a lighting lamp of a phase on the same lamp group, and if the current of the red lamp loop is smaller and the difference value is larger than a preset difference value percentage, judging that the red lamp of the loop signal has a red lamp fault; and similarly, obtaining the judgment process of the lamp control loop of the yellow lamp.
9. The traffic signal adaptive fault determination method according to claim 5, comprising a step of determining a count-down signal loop, wherein in the step of recording the reference voltage and the reference current of the count-down signal, reference voltages and reference currents corresponding to the count-down numbers are recorded in detail in a reference comparison table, and the count-down signal fault is determined if the current before the start of the count-down and the current at the time t after the start of the count-down have no change or change values are smaller than a set threshold value.
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| CN117518020B (en) * | 2023-12-28 | 2024-03-19 | 杭州方千科技有限公司 | Traffic signal lamp fault detection system and traffic signal device |
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