CN103559801A - Countdown digital display signal lamp fault detection system simultaneously driven by multiple loads - Google Patents
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Abstract
The invention discloses a countdown digital display signal lamp fault detection system simultaneously driven by multiple loads to solve the problem of detecting faults which happen to a part of signal lamps after the plurality of digital display signal lamps are connected in parallel and then connected to an output end of a signal machine. According to the technical scheme, voltage information, current information and charging time information of the output end of each circuit of the signal machine are collected, logical processing and successive comparison are conducted on the collected information, and therefore fault information of the signal lamps is judged. According to the technical scheme, power of a load end is simulated according to the capacitor charging time, a power to voltage conversion circuit and an AD circuit are prevented from being used, and the circuit structure where fault detection of the plurality of signal lamps can be driven by one output end and the detection procedure are simplified.
Description
Technical field
The invention belongs to transport information control technology field, relate in particular to method and the technology of a kind of traffic signal light fault detection and radio alarming.
Background technology
The basic tool that traffic lights relieve traffic congestion as control, has brought into play huge effect to coordinating urban traffic intersection different directions traffic flow.Traffic lights great majority are the scenes that are installed on traffic intersection; owing to there not being cabinet protection as other consumers; signal lamp is easy to be subject to the impact of natural causes such as being struck by lightning, drench with rain; the probability that causes signal lamp to break down is larger; when the traffic lights as traffic indicative function break down, easily cause traffic intersection to occur traffic jam, even cause traffic hazard.Therefore, obtain as early as possible the failure message of traffic intersection signal lamp and it is safeguarded fast, to reducing the traffic jam very large meaning that avoided traffic accident.
Because traffic lights in reality use are installed to the very complicated detection difficult that causes traffic lights of connection of teleseme; After the digital display pilot lamp parallel connection of North and South direction, receive the output terminal in teleseme direction south or direction north, after the digital display pilot lamp possibility parallel connection on a plurality of walkways, receive some People's Bank of China output terminal of teleseme, cause a load end to be connected to a plurality of digital display signal lamps, rather than the corresponding signal lamp of the output terminal of a teleseme, when the part signal lamp failure of an output terminal, can not only by an output terminal, whether there be electric current, voltage to differentiate.Existing traffic signal control seldom has the fault diagnosis functions for signal lamp, and that the pick-up unit of the existing signal lamp failure that is independent of teleseme installs to variety classes signal lamp, output terminal the situation adaptability that traffic lights quantity is different is bad, simultaneously because existing detection architecture device is complicated, expensive, its structure is even complicated a lot of than traffic signal control, causes signal lamp failure to detect the still practical detection method reliably of neither one.
The existing traffic lights fault detection system that is independent of traffic control signal machine has plenty of according to the information of voltage at traffic lights two ends and carries out fault judgement, also having system is the current status information by multi collect traffic lights, then by certain self-learning algorithm, removes to judge the failure message of traffic lights; " traffic signal lamp detector " (application number: 201020281558.9, applicant: be Wu Haidong) by certain circuit, lamp two ends 220V AC signal to be converted into the Transistor-Transistor Logic level signal of 5V, again the information of voltage of this traffic lights is transferred to network monitoring chamber and by people, is judged the failure message of traffic lights, the defect of this technology is to detect partial fault state, and in numerous malfunctions, there is voltage at traffic lights two ends and situation that lamp breaks down has a lot; " a kind of traffic signal fault detection device and detection method thereof with self-learning function " (application number: 201010594973.4, applicant: Wang Jing) by the current status information of the collection traffic lights such as AD, this information is delivered to the malfunction that judges lamp in arm processor by self-learning algorithm, this technology has been used AD translation circuit, filtering circuit and has been caused the structure of circuit comparatively complicated, and the algorithm calculated amount of self study is large, sense cycle is longer.
Summary of the invention
What the invention provides that a kind of circuit structure is simple, practical, detection speed is fast drives the fault detection system of a plurality of countdown digital display signal lamps for output terminal of teleseme, the most common failure of the detection digital display signal lamp that system can be promptly and accurately.
The technical solution adopted for the present invention to solve the technical problems is: multi-load is with driving countdown digital display signal lamp fault detection system, and it comprises following characteristics:
1, multi-load is with driving countdown digital display signal lamp fault detection system to comprise voltage detecting circuit, current detection circuit, governor circuit, telecommunication circuit, voltage detecting circuit converts thereof into low and high level information for the power frequency 220V information of voltage at collection signal lamp two ends, and this level information is passed to governor circuit, current detection circuit converts thereof into low and high level information for gathering the current information of traffic lights, and low and high level information is passed to governor circuit, current detection circuit and governor circuit are in conjunction with gathering the duration of charging that output end signal lamp is corresponding, governor circuit is to the information of voltage obtaining, current information, duration of charging carries out data processing and judges the malfunction of signal lamp, telecommunication circuit uploads to traffic surveillance and control center by the status information of signal lamp,
2, multi-load is with driving countdown digital display signal lamp fault detection system also to comprise that power detection, minimum resolution based on capacitor charging time determine that method, an output terminal drive at most digital display signal lamp number determination method, system failure detection flow process, duration of charging data acquisition and disposal route; Power detection based on capacitor charging time has provided the relation in bearing power and duration of charging, minimum resolution determines that method has provided three factors of the minimum time fluctuation that determines that detection system can effectively detect, an output terminal drives at most digital display signal lamp number determination method to provide the output terminal driving signal lamp maximum number method for determination of amount that detection system allows, system failure detection flow process has provided the failure detection steps of native system, and duration of charging data acquisition and disposal route have provided the process of duration of charging collection and the method for data processing;
3, voltage detecting circuit comprise current-limiting resistance, voltage dependent resistor (VDR), one-way conduction diode, isolation optocoupler, for resistance and the electric capacity of filtering, as shown in Figure 2, live wire in the 220V power lead of traffic lights is linked into circuit through current-limiting resistance, the other end of current-limiting resistance connects the positive input of one-way conduction diode, the anode input end of the other end access optocoupler of one-way conduction diode, the negative electrode input end of optocoupler is received on zero line, filter capacitor is parallel to the input end of optocoupler, voltage dependent resistor (VDR) is concatenated between zero line and live wire, the drain electrode output terminal of optocoupler is received the positive pole of power supply, the filtering circuit that grid output terminal serial connection consists of filter capacitor and resistance parallel connection, the other end ground connection of filtering circuit, the grid output terminal of optocoupler is low and high level output terminal, receive on the IO mouth of processor,
4, current detection circuit comprises current transformer, voltage dependent resistor (VDR), current/voltage transfer resistance, one-way conduction diode, current-limiting resistance, charging capacitor, stabilivolt, discharge resistance, discharge switch, as shown in Figure 3, the input as circuit through current transformer of the power lead of signal lamp power supply, voltage dependent resistor (VDR) and current/voltage transfer resistance are parallel to the output terminal of mutual inductor, an one-way conduction diode of an output terminal serial connection of mutual inductor, the other end of diode is connected in series a current-limiting resistance again, the other end of current-limiting resistance is received one end of charging capacitor, the other end of charging capacitor is received another output terminal of current transformer, stabilivolt with one-way conduction diode with consistent electric direction and receive electric capacity two ends, the discharge circuit that the two ends parallel connection of stabilivolt is composed in series by discharge resistance and discharge switch, the forward output terminal of stabilivolt is low and high level, be connected to the IO mouth of main control processor,
5, the power detection based on capacitor charging time, is mainly according under different capacity, and the asynchronism(-nization) that electric capacity is charged to a certain level carrys out the variation of analog input end power; As shown in Figure 3, the voltage at electric capacity two ends and the charging current of electric capacity is met to following three formulas:
U wherein
cfor capacitor C both end voltage, C is the capacitance of current line capacitance in capacitor C 1 to Cn, and i (t) is the electric current to capacitor charging, and t is the duration of charging, and ∫ is integral sign, and dt is integral operator, represents t to carry out integration, U
ofor the voltage of one-way conduction diode cathode output, Rw is resistance R w_1 to the resistance of current line resistance in Rw_n, and Rv is resistance R v_1 to the resistance of current line resistance in Rv_n, the unit square wave function that U (t) is 50Hz for frequency, and U (t) makes U
oonly has sinusoidal wave positive half period to capacitor charging, n is the quantity that current output terminal drives signal lamp, and W is the power of a signal lamp of current output terminal, and V is signal lamp supply voltage, k is the turn ratio of current transformer, pressure drop when Δ U is one-way conduction diode current flow; By above three formula, obtained the voltage U at electric capacity two ends
cas follows with the relation of duration of charging t:
During n signal lamp of output termination, be charged to high level U
htime t
nduring with n-1 signal lamp of output termination, be charged to high level U
htime t
n-1be limited to two formulas below:
According to two formulas above, obtain t
nand t
n-1solution as follows:
Δ T=t
n-1-t
nbe the difference that an output n-1 signal lamp of termination and an output termination n signal lamp are charged to high level time, the quantity n of Δ T and the driving signal lamp relation that is inversely proportional to wherein, n increase Δ T reduces, and n reduces Δ T increase;
6, minimum resolution is determined method: minimum resolution T is the minimum duration of charging difference DELTA T that detection system can effectively be identified, and the limited size of T is in following three conditions: the machine cycle T of processor
1, the duration of charging fluctuation T that causes of load end external interference
2change with testing circuit component parameter the duration of charging fluctuation T causing
3, the size of T is directly proportional to the sum that affects that above-mentioned three conditions produce respectively, as shown in the formula described: T=k
1t
1+ k
2t
2+ k
3t
3, k
1, k
2, k
3>=1;
7, an output terminal drives at most digital display signal lamp number determination method: countdown digital display pilot lamp its power in work changes, the digital display peak power at work of must usining is calculated detection system as W and is allowed an output terminal maximum drive quantity, and definite method of maximum signal lamp quantity N that load end of detection system permission teleseme drives is as shown in the formula described: T=t
n-1-t
n
W is the peak power in digital display work, solves the value of n by formula above, and a load end of permission drives at most quantity N=[n]-1, [n] represents n to round;
8, multi-load is with driving the testing process of countdown digital display signal lamp fault detection system to comprise following steps, as shown in Figure 4, identifying: the way that is connected to digital display signal lamp after system powers on according to current information and information of voltage recognition detection system digital display input end (output terminal of teleseme), at the output terminal that is connected to signal lamp, gather respectively the duration of charging at crossing and set up " time-power " function library, power was simulated with the duration of charging, touring testing process: processor reads the current status (high or low) that is connected to signal lamp output terminal, voltage status (high or low), whether consistent with information of voltage by contrasting the current information of this output terminal, if inconsistent, send warning message, gathering fault detection system input end is connected to the duration of charging on the corresponding road of digital display signal lamp and sets up " time-power " function library, " time-power " function library is now deducted to the performance number of corresponding " time-power " function library constantly in current road that identifying obtains, if the difference of section or certain several time period is greater than minimum resolution T sometime, a certain section of Ze Gai road digital display signal lamp or a few segment numeral pipe break down, if the power difference in the whole time domain of function is greater than minimum resolution T, the a certain road of this output terminal or a few way explict occurrence fault, if difference is less than the minimum T of resolution, Ze Gai road output end signal lamp is working properly, judge the failure message on primary processor Jiang Gai road after failure message and upload to traffic surveillance and control center by telecommunication circuit,
9, duration of charging data acquisition and disposal route, identifying: take voltage signal as synchronizing signal, start energising at output terminal, when digital display signal lamp brightens by going out, start in seconds timing, at output terminal, stop power supply, signal lamp change is gone out and is stopped timing constantly, duration of charging at each second multi collect of timing in this second, the data that obtain are asked to intermediate value, the duration of charging of the simulated power using this intermediate value as this second, the duration of charging in three cycles of continuous acquisition, to three cycles, three duration of charging of same second correspondence are asked intermediate value, using intermediate value now as the identifying Zhong Gai road signal lamp duration of charging of this second, set up current road " time-power " function library, touring testing process: take voltage signal as synchronizing signal, at output terminal, start energising, when digital display signal lamp brightens by going out, start in seconds timing, at output terminal, stop power supply, signal lamp becomes while going out, processor stops timing, duration of charging at each second multi collect of timing in this second, to the data sorting collecting, ask for intermediate value, the time that discharges and recharges using this intermediate value as this second simulated power, set up " time-power " function library, after the collection of " time-power " function library completes, the functional value now obtaining is deducted to the functional value in the synchronization identifying of current road, if difference is greater than minimum resolution T, current road load end occurs that bearing power declines, if difference be less than minimum resolution T the output terminal load of current road do not occur that bearing power declines, in the process of normal operation, the cycle of teleseme or the time of traffic lights change, and by the method for above-mentioned identifying, upgrade " time-power " function library on corresponding road.
The invention has the beneficial effects as follows provide a kind of simple in structure, detection speed is fast for an output terminal, drives a plurality of countdown digital display signal lamp fault detection systems, system can Intelligent Measurement be connected to the way of signal lamp and the power of output terminal load to the output terminal of intersection annunciator.System judges the malfunction of signal lamp by the variation of output terminal power, can promptly and accurately detect the malfunction of signal lamp, the fault status information of shortened the cycle that signal lamp failure keeps in repair, avoiding artificially arriving site inspection signal lamp, has saved manpower and materials.
Accompanying drawing explanation
Fig. 1 is that multi-load of the present invention is with the structured flowchart that drives countdown digital display signal lamp fault detection system;
Fig. 2 is that multi-load of the present invention is with the circuit diagram that drives countdown digital display signal lamp fault detection system voltage detecting circuit, wherein RY_1 is voltage dependent resistor (VDR), R1_1 is current-limiting resistance, D1 is one-way conduction diode, C1_1 is filter capacitor, U1 is isolation optocoupler, R1_2 filter resistance, C1_2 filter capacitor, VCC represents the positive pole of power supply, GND represents the negative pole of power supply, IO represents the IO mouth of processor, L refers to the live wire of traffic lights power supply, N refers to the zero line of traffic lights power supply, RY_n wherein, Rn_1, Dn, Cn_1, Un, Rn_2, Cn_2 is as RY_1, R1_1, D1, C1_1, U1, R1_2, C1_2,
Fig. 3 is that multi-load of the present invention is with the circuit diagram that drives countdown digital display signal lamp fault detection system current detection circuit, wherein RY_1 is that voltage dependent resistor (VDR), RV_1 are that electric current turns voltage resistance, D1 is that one-way conduction diode, RW_1 are that current-limiting resistance, C1 are that shaping capacitance, W1 are that stabilivolt, RF_1 are the IO mouth that discharge resistance, IO are processor, EN is the control end of processor controlled discharge switch, the negative pole that GND represents power supply, and RY_n, RV_n, Dn, RW_n, Cn, Wn, RF_n are as RY_1, RV_1, D1, RW_1, C1, W1, RF_1;
Fig. 4 is that multi-load of the present invention is with the fault detect process flow diagram that drives countdown digital display signal lamp fault detection system.
Embodiment
Multi-load is with driving countdown digital display signal lamp fault detection system to comprise voltage detecting circuit, current detection circuit, governor circuit, telecommunication circuit; The processor of governor circuit need to possess parallel processing function, conventionally selects FPGA; Local communication interface is selected Max485, and communication module is selected GPRS wireless transmitter, and communication network is wireless GPRS network, below in conjunction with accompanying drawing, the present invention is told about in detail.
1, as shown in Figure 1, the power frequency 220V information of voltage at voltage detecting circuit collection signal lamp two ends converts thereof into low and high level information, and this level information is passed to governor circuit; Current detection circuit converts thereof into low and high level information for gathering the current information of traffic lights, and low and high level information is passed to governor circuit; Current detection circuit with governor circuit in conjunction with duration of charging corresponding to collection signal lamp; Governor circuit carries out to obtaining information of voltage, current information, duration of charging the malfunction that data processing judges signal lamp; Telecommunication circuit uploads to traffic surveillance and control center by the status information of signal lamp;
2, the power detection based on capacitor charging time has provided the relation in bearing power and duration of charging; Minimum resolution determines that method has provided three factors of the minimum time fluctuation that determines that detection system can effectively detect; An output terminal drives at most signal lamp number determination method to provide the output terminal driving signal lamp maximum number method for determination of amount that detection system allows; System failure detection flow process has provided the failure detection steps of native system; Duration of charging data acquisition and disposal route have provided the process of duration of charging collection and the method for data processing;
3, as shown in Figure 2, in the present embodiment, voltage detecting circuit comprises voltage dependent resistor (VDR) RY_1, current-limiting resistance R1_1, one-way conduction diode D1, filter capacitor C1_1, isolation optocoupler U1, filter resistance R1_2, filter capacitor C1_2; One end of current-limiting resistance R1_1 is connected with the live wire of traffic lights (L), the other end is connected with commutation diode D1, the other end of D1 is connected with shaping capacitance C1_1, the other end of electric capacity is received zero line (N), the input end of optocoupler is also to the two ends of capacitor C 1_1, and the drain electrode output terminal of optocoupler is received the positive pole of power supply, the low-pass filter circuit that the source series of optocoupler consists of R1_2 and C1_2 parallel connection, the other end ground connection of low-pass filter circuit, the source electrode output terminal of optocoupler is received the IO mouth of governor circuit; It is the voltage dependent resistor (VDR) of 7k, withstand voltage 470V that voltage dependent resistor (VDR) RY_1 selects resistance, R1_1 selects 50K/2W resistance, D1 selects 1N4007, C1_1 selects 25v/47uf electric capacity, U1 selects 6N137, R1_2 selects 10K/0.25W resistance, and C1_2 selects 16v/10uf electric capacity, and wherein RY_n, Rn_1, Dn, Cn_1, Un, Rn_2, Cn_2 are as RY_1, R1_1, D1, C1_1, U1, R1_2, C1_2;
4, as shown in Figure 3, in the present embodiment, current detection circuit comprises current transformer, voltage dependent resistor (VDR) RY_1, electric current turns voltage resistance RV_1, one-way conduction diode D1, current-limiting resistance RW_1, shaping capacitance C1, stabilivolt W1, discharge resistance RF_1, discharge switch, the output terminal of current transformer is in parallel with RY_1 and RV_1, one end of the RV_1 of resistance is connected with the anode of D1, stabilivolt W1 is parallel to C1 two ends, after connecting with discharge switch, also arrives RF_1 the two ends of capacitor C 1, the break-make control end En of discharge switch receives the IO mouth of governor circuit, being low and high level and receiving the IO mouth of governor circuit of C1 two ends output, current transformer is selected turn ratio 400:1, input rated current 2A, rated voltage is the mutual inductor of 1000V, it is 7K that voltage dependent resistor (VDR) RY_1 selects resistance, withstand voltage is the voltage dependent resistor (VDR) of 470V, RV_1 can select 500K/0.25W resistance, RW_1 can select 0.5K/0.25W resistance, diode D1 can select 1N4001, stabilivolt W1 selects 1N4731, capacitor C 1 is selected the electric capacity of 16v/1uf, discharge resistance RF_1 selects 0.1K/0.25W resistance, discharge switch is selected CD4066, RY_n wherein, RV_n, Dn, RW_n, Cn, Wn, RF_n chooses with reference to RY_1, RV_1, D1, RW_1, C1, W1, RF_1, can select according to actual loading difference corresponding to different output terminals the components and parts of different parameters,
5, the described power detection based on capacitor charging time is mainly according under different capacity, and the asynchronism(-nization) that electric capacity is charged to a certain level carrys out the variation of analog input end power; Single digital display signal lamp shows that the power of " 88 " is W, and the power after n signal lamp parallel connection is exactly n*W, take FPGA as example, U
hfor 3V left and right, the above-mentioned t of substitution
nand t
n-1computing formula, can show that termination n of output and n-1 signal lamp are charged to the time of high level;
6, determining of described minimum resolution T, the machine cycle T of processor
1choose, take FPGA as its crystal oscillator of example be 50MHz, machine cycle T
1be 0.02 microsecond, consider that processor also needs to carry out many instructions, conventionally k
1choose 10 to 100, load end disturbs the duration of charging fluctuation T causing
2, according to real data T
2choose t
n10%, and k
2choose 2 or 3, testing circuit component parameter changes the fluctuation T in the duration of charging causing
3can choose actual charging data t
n10%, and k
3can choose 1 or 2, minimum resolution T can be according to formula T=k
1t
1+ k
2t
2+ k
3t
3calculate;
7, the peak signal lamp quantity N that load end of described detection system permission teleseme drives determines, according to the t drawing above
n, t
n-1differentiate T with minimum, the formula that calculates N can be drawn to the value of N above data substitution;
8, described multi-load is with driving the testing process of countdown digital display signal lamp fault detection system to comprise following steps, as shown in Figure 4, after powering on, system is connected to the way of digital display signal lamp according to current information and information of voltage recognition detection system digital display input end (output terminal of teleseme), at the output terminal that is connected to signal lamp, gather respectively the duration of charging at crossing and set up " time-power " function library, power was simulated with the duration of charging, after having identified, enter touring testing process, processor reads current status information (high or low), the voltage status information (high or low) that is connected to signal lamp output terminal, whether consistent with voltage status information by contrast current status information, if inconsistent, send warning message, gathering fault detection system input end is connected to the duration of charging on the corresponding road of digital display signal lamp and sets up " time-power " function library, " time-power " function library is now deducted to the power of corresponding " time-power " function library constantly in current road that identifying obtains, if the difference of section or certain several time period is greater than minimum resolution T sometime, a certain section of Ze Gai road digital display signal lamp or a few segment numeral pipe break down, if the power difference in the whole time domain of function is greater than minimum resolution T, the a certain road of this output terminal or a few way explict occurrence fault, if difference is less than the minimum T of resolution, Ze Gai road output end signal lamp is working properly, judge the failure message on primary processor Jiang Gai road after failure message and upload to traffic surveillance and control center by telecommunication circuit,
9, described duration of charging data acquisition and disposal route, identifying: the information of voltage that reads current output terminal by voltage detecting circuit, and take this information of voltage as synchronizing signal, when supply voltage starts energising, when signal lamp brightens, disconnect discharge switch, allow current detection circuit start capacitor charging, processor starts timing, when the level at processor judgement electric capacity two ends reaches high level, processor stops timing, record this duration of charging, closed discharge switch is to capacitor discharge, after electric discharge 5ms, disconnect again discharge switch, start timing and again gather the duration of charging, after collecting 3 data, stop, to 3 data sortings, remove maximal value and minimum value, using the power of remaining intermediate value countdown digital display within this second, when arriving, gather next second the duration of charging of next second with same method, take information of voltage as synchronizing signal, when digital display signal lamp becomes last second last second as image data of going out, the duration of charging in three cycles of continuous acquisition, to three cycles, three duration of charging of same second correspondence are asked intermediate value, using intermediate value now as the identifying Zhong Gai road signal lamp duration of charging of this second, set up current road " time-power " function library, in touring testing process, take voltage signal as synchronizing signal, at output terminal, start energising, when digital display signal lamp brightens by going out, start in seconds timing, at output terminal, stop power supply, signal lamp becomes to go out and stop timing constantly, the duration of charging gathering in this second for 3 times in each second of timing, remove maximal value, minimum value, ask for intermediate value, the time that discharges and recharges of the simulated power using this intermediate value as this second, after the collection of " time-power " function library completes, the functional value now obtaining is deducted to the functional value of " time-power " function library of the current road synchronization obtaining in identifying, if difference is greater than minimum resolution T, there is fault in current road signal lamp, if difference is less than minimum resolution T, current road digital display signal lamp is normal, in the process of normal operation, the cycle of teleseme or the time of traffic lights change, and by above-mentioned identifying method, upgrade " time-power " function library on corresponding road.
Claims (1)
1. multi-load is with driving countdown digital display signal lamp fault detection system to comprise following characteristics:
1) multi-load is with driving countdown digital display signal lamp fault detection system to comprise voltage detecting circuit, current detection circuit, governor circuit, telecommunication circuit, voltage detecting circuit converts thereof into low and high level information for the power frequency 220V information of voltage at collection signal lamp two ends, and this level information is passed to governor circuit, current detection circuit converts thereof into low and high level information for gathering the current information of traffic lights, and low and high level information is passed to governor circuit, current detection circuit and governor circuit are in conjunction with gathering the duration of charging that output end signal lamp is corresponding, governor circuit is to the information of voltage obtaining, current information, duration of charging carries out data processing and judges the malfunction of signal lamp, telecommunication circuit uploads to traffic surveillance and control center by the status information of signal lamp,
2) multi-load is with driving countdown digital display signal lamp fault detection system also to comprise that power detection, minimum resolution based on capacitor charging time determine that method, an output terminal drive at most digital display signal lamp number determination method, system failure detection flow process, duration of charging data acquisition and disposal route; Power detection based on capacitor charging time has provided the relation in bearing power and duration of charging, minimum resolution determines that method has provided three factors of the minimum time fluctuation that determines that detection system can effectively detect, an output terminal drives at most digital display signal lamp number determination method to provide the output terminal driving signal lamp maximum number method for determination of amount that detection system allows, system failure detection flow process has provided the failure detection steps of native system, and duration of charging data acquisition and disposal route have provided the process of duration of charging collection and the method for data processing;
3) voltage detecting circuit comprise current-limiting resistance, voltage dependent resistor (VDR), one-way conduction diode, isolation optocoupler, for resistance and the electric capacity of filtering, live wire in the 220V power lead of traffic lights is linked into circuit through current-limiting resistance, the other end of current-limiting resistance connects the positive input of one-way conduction diode, the anode input end of the other end access optocoupler of one-way conduction diode, the negative electrode input end of optocoupler is received on zero line, filter capacitor is parallel to the input end of optocoupler, voltage dependent resistor (VDR) is concatenated between zero line and live wire, the drain electrode output terminal of optocoupler is received the positive pole of power supply, the filtering circuit that grid output terminal serial connection consists of filter capacitor and resistance parallel connection, the other end ground connection of filtering circuit, the grid output terminal of optocoupler is low and high level output terminal, receive on the IO mouth of processor,
4) current detection circuit comprises current transformer, voltage dependent resistor (VDR), current/voltage transfer resistance, one-way conduction diode, current-limiting resistance, charging capacitor, stabilivolt, discharge resistance, discharge switch, the input as circuit through current transformer of the power lead of signal lamp power supply, voltage dependent resistor (VDR) and current/voltage transfer resistance are parallel to the output terminal of mutual inductor, an one-way conduction diode of an output terminal serial connection of mutual inductor, the other end of diode is connected in series a current-limiting resistance again, the other end of current-limiting resistance is received one end of charging capacitor, the other end of charging capacitor is received another output terminal of current transformer, stabilivolt with one-way conduction diode with consistent electric direction and receive electric capacity two ends, the discharge circuit that the two ends parallel connection of stabilivolt is composed in series by discharge resistance and discharge switch, the forward output terminal of stabilivolt is low and high level, be connected to the IO mouth of main control processor,
5) power detection based on capacitor charging time, is mainly according under different capacity, and the asynchronism(-nization) that electric capacity is charged to a certain level carrys out the variation of analog input end power; The voltage at electric capacity two ends and the charging current of electric capacity is met to following three formulas:
U wherein
cfor capacitor C both end voltage, C is the capacitance of current line capacitance in capacitor C 1 to Cn, and i (t) is the electric current to capacitor charging, and t is the duration of charging, and ∫ is integral sign, and dt is integral operator, represents t to carry out integration, U
ofor the voltage of one-way conduction diode cathode output, Rw is resistance R w_1 to the resistance of current line resistance in Rw_n, and Rv is resistance R v_1 to the resistance of current line resistance in Rv_n, the unit square wave function that U (t) is 50Hz for frequency, and U (t) makes U
oonly has sinusoidal wave positive half period to capacitor charging, n is the quantity that current output terminal drives signal lamp, and W is the power of a signal lamp of current output terminal, and V is signal lamp supply voltage, k is the turn ratio of current transformer, pressure drop when Δ U is one-way conduction diode current flow; By above three formula, obtained the voltage U at electric capacity two ends
cas follows with the relation of duration of charging t:
During n signal lamp of output termination, be charged to high level U
htime t
nduring with n-1 signal lamp of output termination, be charged to high level U
htime t
n-1be limited to two formulas below:
According to two formulas above, obtain t
nand t
n-1solution as follows:
Δ T=t
n-1-t
nbe the difference that an output n-1 signal lamp of termination and an output termination n signal lamp are charged to high level time, the quantity n of Δ T and the driving signal lamp relation that is inversely proportional to wherein, n increase Δ T reduces, and n reduces Δ T increase;
6) minimum resolution is determined method: minimum resolution T is the minimum duration of charging difference DELTA T that detection system can effectively be identified, and the limited size of T is in following three conditions: the machine cycle T of processor
1, the duration of charging fluctuation T that causes of load end external interference
2change with testing circuit component parameter the duration of charging fluctuation T causing
3, the size of T is directly proportional to the sum that affects that above-mentioned three conditions produce respectively, as shown in the formula described: T=k
1t
1+ k
2t
2+ k
3t
3, k
1, k
2, k
3>=1;
7) output terminal drives at most digital display signal lamp number determination method: countdown digital display pilot lamp its power in work changes, the digital display peak power at work of must usining is calculated detection system as W and is allowed an output terminal maximum drive quantity, and definite method of maximum signal lamp quantity N that load end of detection system permission teleseme drives is as shown in the formula described: T=t
n-1-t
n
W is the peak power in digital display work, solves the value of n by formula above, and a load end of permission drives at most quantity N=[n]-1, [n] represents n to round;
8) multi-load is with driving the testing process of countdown digital display signal lamp fault detection system to comprise following steps, identifying: the way that is connected to digital display signal lamp after system powers on according to current information and information of voltage recognition detection system digital display input end (output terminal of teleseme), at the output terminal that is connected to signal lamp, gather respectively the duration of charging at crossing and set up " time-power " function library, power was simulated with the duration of charging, touring testing process: processor reads the current status (high or low) that is connected to signal lamp output terminal, voltage status (high or low), whether consistent with information of voltage by contrasting the current information of this output terminal, if inconsistent, send warning message, gathering fault detection system input end is connected to the duration of charging on the corresponding road of digital display signal lamp and sets up " time-power " function library, " time-power " function library is now deducted to the performance number of corresponding " time-power " function library constantly in current road that identifying obtains, if the difference of section or certain several time period is greater than minimum resolution T sometime, a certain section of Ze Gai road digital display signal lamp or a few segment numeral pipe break down, if the power difference in the whole time domain of function is greater than minimum resolution T, the a certain road of this output terminal or a few way explict occurrence fault, if difference is less than the minimum T of resolution, Ze Gai road output end signal lamp is working properly, judge the failure message on primary processor Jiang Gai road after failure message and upload to traffic surveillance and control center by telecommunication circuit,
9) duration of charging data acquisition and disposal route, identifying: take voltage signal as synchronizing signal, start energising at output terminal, when digital display signal lamp brightens by going out, start in seconds timing, at output terminal, stop power supply, signal lamp change is gone out and is stopped timing constantly, duration of charging at each second multi collect of timing in this second, the data that obtain are asked to intermediate value, the duration of charging of the simulated power using this intermediate value as this second, the duration of charging in three cycles of continuous acquisition, to three cycles, three duration of charging of same second correspondence are asked intermediate value, using intermediate value now as the identifying Zhong Gai road signal lamp duration of charging of this second, set up current road " time-power " function library, touring testing process: take voltage signal as synchronizing signal, at output terminal, start energising, when digital display signal lamp brightens by going out, start in seconds timing, at output terminal, stop power supply, signal lamp becomes while going out, processor stops timing, duration of charging at each second multi collect of timing in this second, to the data sorting collecting, ask for intermediate value, the time that discharges and recharges using this intermediate value as this second simulated power, set up " time-power " function library, after the collection of " time-power " function library completes, the functional value now obtaining is deducted to the functional value in the synchronization identifying of current road, if difference is greater than minimum resolution T, current road load end occurs that bearing power declines, if difference be less than minimum resolution T the output terminal load of current road do not occur that bearing power declines, in the process of normal operation, the cycle of teleseme or the time of traffic lights change, and by the method for above-mentioned identifying, upgrade " time-power " function library on corresponding road.
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| CN101546483B (en) * | 2008-03-26 | 2010-12-08 | 中国科学院自动化研究所 | System and method for fault diagnosis of traffic signal controller |
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