CN103559802B - Varying duty is with drive singal lamp fault detection system - Google Patents
Varying duty is with drive singal lamp fault detection system Download PDFInfo
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Abstract
The invention discloses a kind of for varying duty with drive singal lamp fault detection method, the test problems of part signal lamp failure during for receiving an output terminal of teleseme after solving the parallel connection of multi-signal lamp.Technical scheme is information of voltage, current information, duration of charging information by each road output terminal of collection signal machine, carries out logical process and front and back contrast, judge the failure message of signal lamp to the information collected; This technical scheme by capacitor charging time fictitious load end power, is avoided using power to turn potential circuit and AD circuit, simplifies circuit structure and testing process that an output terminal drives multiple signal lamp failure to detect.
Description
Technical field
The invention belongs to transport information control technology field, particularly relate to a kind of traffic signal light fault and detect the technique and method with radio alarming.
Background technology
Traffic lights, as the basic tool controlling to relieve traffic congestion, have played huge effect to coordination urban traffic intersection different directions traffic flow.Traffic lights great majority are the scenes being installed on traffic intersection; owing to not having cabinet to protect as other consumers; signal lamp is easy to the impact being subject to natural causes such as being struck by lightning, drench with rain; the probability causing signal lamp to break down is larger; easily cause when the traffic lights as traffic indicative function break down traffic intersection to occur traffic jam, even cause traffic hazard.Therefore, obtain the failure message of traffic intersection signal lamp as early as possible and it is safeguarded fast, minimizing traffic jam has been avoided traffic accident very large meaning.
The connection being installed to teleseme due to traffic lights in reality use is very complicated, causes the detection difficult of traffic lights; The output terminal that teleseme direction is southern or direction is northern is received after the signal lamp parallel connection of North and South direction, some People's Bank of China output terminal of teleseme is received after the signal lamp possibility parallel connection on multiple walkway, a load end is caused to be connected to multiple signal lamp, instead of 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 whether having electric current, voltage to differentiate.Existing traffic signal control seldom has the fault diagnosis functions for signal lamp, and the situation adaptability that the pick-up unit of the existing signal lamp failure independent of teleseme installs traffic lights quantity different to variety classes signal lamp, output terminal is bad, simultaneously because existing detection architecture device is complicated, expensive, its structure is even complicated than traffic signal control a lot, causes signal lamp failure to detect the practical detection method reliably of still neither one.
The existing traffic lights fault detection system independent of traffic control signal machine has plenty of and carries out breakdown judge according to the information of voltage at traffic lights two ends, also there is system to be current state information by multi collect traffic lights, then remove by certain self-learning algorithm the failure message judging traffic lights; " traffic signal lamp detector " (application number: 201020281558.9, applicant: Wu Haidong) be the Transistor-Transistor Logic level signal by certain circuit, lamp two ends 220V AC signal being converted into 5V, again the information of voltage of this traffic lights is transferred to network monitoring room by people to judge the failure message of traffic lights, the defect of this technology is to detect partial fault state, and in numerous malfunction, there is voltage at traffic lights two ends and the 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) current state information of traffic lights is gathered by AD etc., this information is delivered to the malfunction being judged lamp in arm processor by self-learning algorithm, the structure that this technology has used AD translation circuit, filtering circuit causes circuit is comparatively complicated, and the algorithm calculated amount of self study is large, sense cycle is longer.
Summary of the invention
The invention provides a kind of circuit structure is simple, practical, detection speed is fast varying duty with drive singal lamp fault detection technology, this technology promptly and accurately can detect that an output terminal of teleseme drives the most common failure of different capacity kind signal lamp.
The technical solution adopted for the present invention to solve the technical problems is: a kind of varying duty, with drive singal lamp fault detection system, is characterized in that:
This system utilizes based on the power detecting method determination bearing power of capacitor charging time and the relation in duration of charging, minimum resolution defining method is utilized to determine to determine three factors of the minimum time fluctuation that detection system can effectively detect, utilize the output terminal drive singal lamp maximum quantity that output terminal maximum drive singal lamp number determination method determination detection system allows, utilize the failure detection steps of system failure detection flow process certainty annuity, duration of charging data acquisition and procession method is utilized to determine the process of duration of charging collection and data processing, it comprises voltage detecting circuit, current detection circuit, governor circuit, telecommunication circuit, the power frequency 220V information of voltage at voltage detecting circuit collection signal lamp two ends also converts thereof into low and high level information, and this level information is passed to governor circuit, current detection circuit is for gathering the current information of traffic lights and converting thereof into low and high level information, and low and high level information is passed to governor circuit, current detection circuit and governor circuit combine and gather duration of charging corresponding to output end signal lamp, governor circuit is to the information of voltage obtained, current information, duration of charging carries out data processing and judges the malfunction of signal lamp, the status information of signal lamp is uploaded to traffic surveillance and control center by telecommunication circuit, wherein:
1)
nroad voltage detecting circuit comprises current-limiting resistance
, voltage dependent resistor (VDR)
, one-way conduction diode
, isolation optocoupler, for the resistance of filtering and electric capacity, 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 the first 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 output of optocoupler receives the positive pole of power supply, gate output terminal is connected in series the filtering circuit be made up of filter capacitor and resistor coupled in parallel, the other end ground connection of filtering circuit, the gate output terminal of optocoupler and low and high level output terminal, receive on the I/O mouth of processor,
2)
nroad current detection circuit comprises current transformer, current/voltage transfer resistance
, the second voltage dependent resistor (VDR)
, current-limiting resistance
, the second one-way conduction diode, charging capacitor, stabilivolt, discharge resistance, discharge switch, the power lead that signal lamp is powered is through the input of current transformer as circuit, second voltage dependent resistor (VDR) and current/voltage transfer resistance are parallel to the output terminal of mutual inductor, an output terminal of mutual inductor is connected in series an one-way conduction diode, the other end of diode is connected in series a current-limiting resistance again, the other end of current-limiting resistance receives one end of charging capacitor, the other end of charging capacitor receives another output terminal of current transformer, stabilivolt and one-way conduction diode are with consistent electric direction and receive electric capacity two ends, the two ends discharge circuit be composed in series by discharge resistance and discharge switch in parallel of stabilivolt, the forward output terminal of stabilivolt is low and high level, be connected to the I/O mouth of main control processor,
3) based on the power detecting method of capacitor charging time, mainly according under different capacity, to electric capacity be charged to time of a certain level different come the change of analog input end power; The power kind of the signal lamp that teleseme output terminal drives
, its respective signal lamp quantity be respectively
, the average power of above-mentioned different capacity kind signal lamp
described by following two formulas:
，
The voltage at electric capacity two ends and following three formulas are met to the charging current of electric capacity:
Wherein
for electric capacity C both end voltage,
for the capacitance of current line electric capacity in electric capacity C1 to Cn,
for the electric current to capacitor charging,
for the duration of charging,
for integral sign,
for integral operator, represent right
carry out integration,
for the voltage that one-way conduction diode cathode exports,
for resistance
arrive
the resistance of middle current line resistance,
for resistance
arrive
the resistance of middle current line resistance,
for the unit square wave function that frequency is 50Hz,
make
only have sinusoidal wave positive half period to capacitor charging,
for the quantity of current output terminal drive singal lamp,
for the power of a current output terminal signal lamp,
for signal lamp supply voltage,
for the turn ratio of current transformer,
for pressure drop during one-way conduction diode current flow; The voltage at electric capacity two ends is obtained by above three formula
with the duration of charging
relation as follows:
Export termination
high level is charged to during individual signal lamp
time
with output termination
high level is charged to during-1 signal lamp
time
be limited to two formulas below:
Obtain according to two formulas above
with
solution as follows:
be one and export termination
individual signal lamp and output termination
individual signal lamp is charged to the difference of high level time, wherein
with the quantity of drive singal lamp
inversely,
increase
reduce,
reduce
increase;
4) minimum resolution defining method: minimum resolution
it is the minimum duration of charging difference that detection system can effectively identify
,
limited size in following three conditions: the machine cycle of processor
, load end external interference cause duration of charging fluctuation
the duration of charging fluctuation caused is changed with testing circuit component parameter
,
size be directly proportional, as shown in the formula described to the sum that affects that above-mentioned three conditions produce respectively:
,
;
5) output terminal maximum drive singal lamp number determination method: the defining method of maximum signal lamp quantity N that detection system allows teleseme load end to drive is as shown in the formula described:
Solved by formula above
value, a load end of permission drive at most quantity N=[
]-1, [
] represent right
round, then the driving quantity that different capacity kind signal lamp allows meets:
;
6) described varying duty comprises following steps with the testing process of drive singal lamp fault detection system: the way being connected to signal lamp after system electrification by current information and information of voltage identification fault detection system input end or teleseme output terminal, the power that the corresponding duration of charging simulates this load end is gathered respectively at the output terminal being connected to signal lamp, circling measurment process is entered after identification completes, processor reads the current state information being connected to signal lamp output terminal, voltage status information, whether consistent with voltage status information by the current state information contrasting this output terminal, if inconsistent, send warning message, gathering duration of charging that output terminal is connected to signal lamp circuit deducts standard time in identifying, if difference is greater than minimum resolution
, then this output terminal has part signal lamp to be in malfunction, if difference is less than minimum resolution
, then the signal lamp of this output terminal all normally works, and after detecting that a certain output terminal breaks down, the failure message on this road is uploaded to traffic surveillance and control center by telecommunication circuit by primary processor,
7) duration of charging data acquisition and procession method, take voltage signal as synchronizing signal, energising is started, in signal lamp brightens by going out at a certain output terminal, the multiple data of continuous acquisition, gather three cycles respectively, and respectively multiple data that each cycle collects are sorted, remove maximal value and the minimum value in each cycle, again the data of three cycle remainders are sorted, ask for intermediate value, record intermediate value now as the standard value in a period of time Nei Gai road simulated power duration of charging; Circling measurment process: using the synchronizing signal of voltage signal as traffic light status, start in power on signal lamp brightens by going out at a certain output terminal, the multiple data of continuous acquisition, a maximal value and a minimum value is removed respectively to after its sequence, intermediate value is asked in remaining data, intermediate value is now deducted the intermediate value of this output terminal in identifying, if both differences are greater than minimum resolution
, then this output terminal emergent power declines, and has signal lamp to break down, if both differences are less than
, then the non-emergent power of output terminal declines, and the signal lamp of output terminal is all normal.
The invention has the beneficial effects as follows provide that a kind of structure is simple, detection speed is fast drives multiple different capacity signal lamp failure detection system for an output terminal, system Intelligent Measurement can 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 change of output terminal power, promptly and accurately can detect the malfunction of signal lamp, shorten the cycle of signal lamp failure maintenance, avoid artificially arriving the malfunction of site inspection signal lamp, save manpower and materials.
Below in conjunction with drawings and Examples, invention is elaborated.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of varying duty of the present invention with drive singal lamp fault detection system;
Fig. 2 is the circuit diagram of varying duty of the present invention with drive singal lamp fault detection system voltage detection 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 I/O port of processor, L refers to the live wire of traffic lights power supply, N refers to the zero line of traffic lights power supply, wherein RY_n, 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 the circuit diagram of varying duty of the present invention with drive singal lamp fault detection system power testing circuit, wherein RY_1 is voltage dependent resistor (VDR), RV_1 is that electric current turns voltage resistance, D1 is one-way conduction diode, RW_1 is current-limiting resistance, C1 is shaping capacitance, W1 is stabilivolt, RF_1 is discharge resistance, IO is the I/O port of processor, the negative pole that EN is the control end of processor controlled discharge switch, GND represents power supply, 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 the fault detect process flow diagram of varying duty of the present invention with drive singal lamp fault detection system.
Embodiment
With reference to accompanying drawing 1-accompanying drawing 4.
Varying duty utilizes based on the power detecting method determination bearing power of capacitor charging time and the relation in duration of charging with drive singal lamp fault detection system, minimum resolution defining method is utilized to determine to determine three factors of the minimum time fluctuation that detection system can effectively detect, utilize the output terminal drive singal lamp maximum quantity that output terminal maximum drive singal lamp number determination method determination detection system allows, utilize the failure detection steps of system failure detection flow process certainty annuity, duration of charging data acquisition and procession method is utilized to determine the process of duration of charging collection and data processing, it comprises voltage detecting circuit, current detection circuit, governor circuit, telecommunication circuit, the processor of governor circuit needs to possess parallel processing function, usually selects FPGA, local communication interface selects Max485, communication module selects GPRS wireless transmitter, communication network is wireless GPRS network, describe the present invention below in conjunction with accompanying drawing: as shown in Figure 1, the power frequency 220V information of voltage at voltage detecting circuit collection signal lamp two ends also converts thereof into low and high level information, and this level information is passed to governor circuit, low and high level information for gathering the current information of traffic lights and converting thereof into low and high level information, and is passed to governor circuit by current detection circuit, current detection circuit and governor circuit are in conjunction with duration of charging corresponding to collection signal lamp, governor circuit to obtaining information of voltage, current information, duration of charging carry out data processing to judge the malfunction of signal lamp, the status information of signal lamp is uploaded to traffic surveillance and control center by telecommunication circuit, wherein:
1) 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 (L) of traffic lights, 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 receives zero line (N), the input end of optocoupler is also to the two ends of electric capacity C1_1, and the drain output of optocoupler receives the positive pole of power supply, and the source series of optocoupler is by R1_2 and the C1_2 low-pass filter circuit formed in parallel, the other end ground connection of low-pass filter circuit, the source electrode output terminal of optocoupler receives the I/O port of governor circuit; Voltage dependent resistor (VDR) RY_1 selects resistance to be the voltage dependent resistor (VDR) of 7k, withstand voltage 470V, 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;
2) 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, two ends also to electric capacity C1 after RF_1 connects with discharge switch, the break-make control end En of discharge switch receives the I/O port of governor circuit, what C1 two ends exported is low and high level and receives the I/O port of governor circuit, turn ratio 400:1 selected by current transformer, input rated current 2A, rated voltage is the mutual inductor of 1000V, voltage dependent resistor (VDR) RY_1 selects resistance to be 7K, 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, electric capacity C1 selects the electric capacity of 16v/1uf, discharge resistance RF_1 selects 0.1K/0.25W resistance, discharge switch selects CD4066, wherein RY_n, RV_n, Dn, RW_n, Cn, Wn, RF_n chooses with reference to RY_1, RV_1, D1, RW_1, C1, W1, RF_1, the components and parts of different parameters can be selected according to the difference of actual loading power corresponding to different output terminal,
3) the described power detection based on capacitor charging time is mainly according under different capacity, to electric capacity be charged to time of a certain level different come the change of analog input end power; The power of variety classes signal lamp is
,
...
, the quantity of its correspondence is respectively
,
...
, for FPGA,
for about 3V, these are substituted into as input
with
computing formula, output termination can be drawn
individual and
individual signal lamp is charged to the time of high level;
4) described minimum resolution
determination, the machine cycle of processor
choose, for FPGA, its crystal oscillator is 50MHz, then machine cycle
be 0.02 microsecond, consider that processor also needs to perform many instructions, usually
choose 10 to 100, load end disturbs the duration of charging fluctuation caused
, according to real data
choose
10%, and
choose 2 or 3, testing circuit component parameter changes the fluctuation in the duration of charging caused
actual charge data can be chosen
10%, and
1 or 2 can be chosen, minimum resolution
can according to formula
calculate;
5) determination of maximum signal lamp quantity N of a described detection system permission teleseme load end driving, according to what draw above
,
with minimum resolution
, the formula calculating N above data being substituted into can draw the value of N;
6) described varying duty is with the testing process of drive singal lamp fault detection system, as shown in Figure 4, after system electrification, primary processor completes initialization, start the signal lamp connection and the duration of charging that identify crossing, according to the output terminal being connected to signal lamp of voltage and current identification information signal machine, to the duration of charging of output terminal identification load being connected to signal lamp, and record these duration of charging; Circling measurment process, read voltage status information and the current state information of current output terminal, whether contrast potential is consistent with current information, judge output terminal whether fault, if output terminal fault then sends the warning message of output terminal fault, if output terminal normally then gathers the duration of charging of this output terminal and is deducted duration of charging of this output terminal that identifying obtains this duration of charging, if the result obtained is less than minimum resolution
then think that the signal lamp that this output terminal drives is all normal, if the result obtained is greater than minimum resolution
, i.e. the power drop of load is greater than the power of a signal lamp, then think that the concurrent alarming information of delivering newspaper of partial fault appears in the signal lamp that this output terminal drives;
7) the described duration of charging gathers and front and back duration of charging data processing method, identifying: the information of voltage being read current output terminal by voltage detecting circuit, and with this information of voltage for synchronizing signal, when supply voltage starts energising, time signal lamp brightens, start to disconnect discharge switch, current detection circuit is allowed to start capacitor charging, processor starts timing, when processor judges that the level at electric capacity two ends reaches high level time, processor stops timing, record this duration of charging, closed discharge switch is to capacitor discharge, discharge switch is disconnected again after electric discharge 5ms, start timing and gather the duration of charging, stop after collecting 20 data, to 20 data sortings, remove maximal value and minimum value, remaining 18 data are preserved, in ensuing two cycles when the signal lamp of this output terminal brightens, same method Acquire and process data, to 54 data sortings obtained after the data acquisition in three cycles completes, ask for the intermediate value of 54 data, this intermediate value is as the standard value of this output end signal lamp analog charge time, circling measurment process: 20 data gathering one-period with the collecting method same with identifying, asks for the intermediate value of 20 data, intermediate value is at this moment deducted the intermediate value of identifying, if the result obtained is less than minimum resolution
then think that the load that this output terminal drives does not have emergent power to decline, if the result obtained is greater than minimum resolution
, then think that power drop has appearred in the load that this output terminal drives, send warning message.
Claims (1)
1. a varying duty is with drive singal lamp fault detection system, it is characterized in that: this system utilizes based on the power detecting method determination bearing power of capacitor charging time and the relation in duration of charging, minimum resolution defining method is utilized to determine to determine three factors of the minimum time fluctuation that detection system can effectively detect, utilize the output terminal drive singal lamp maximum quantity that output terminal maximum drive singal lamp number determination method determination detection system allows, utilize the failure detection steps of system failure detection flow process certainty annuity, duration of charging data acquisition and procession method is utilized to determine the process of duration of charging collection and data processing, it comprises voltage detecting circuit, current detection circuit, governor circuit, telecommunication circuit, the power frequency 220V information of voltage at voltage detecting circuit collection signal lamp two ends also converts thereof into low and high level information, and this level information is passed to governor circuit, current detection circuit is for gathering the current information of traffic lights and converting thereof into low and high level information, and low and high level information is passed to governor circuit, current detection circuit and governor circuit combine and gather duration of charging corresponding to output end signal lamp, governor circuit is to the information of voltage obtained, current information, duration of charging carries out data processing and judges the malfunction of signal lamp, the status information of signal lamp is uploaded to traffic surveillance and control center by telecommunication circuit, wherein:
1)
nroad voltage detecting circuit comprises current-limiting resistance
, voltage dependent resistor (VDR)
, one-way conduction diode
, isolation optocoupler, for the resistance of filtering and electric capacity, 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 the first 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 output of optocoupler receives the positive pole of power supply, gate output terminal is connected in series the filtering circuit be made up of filter capacitor and resistor coupled in parallel, the other end ground connection of filtering circuit, the gate output terminal of optocoupler and low and high level output terminal, receive on the I/O mouth of processor,
2)
nroad current detection circuit comprises current transformer, current/voltage transfer resistance
, the second voltage dependent resistor (VDR)
, current-limiting resistance
, the second one-way conduction diode, charging capacitor, stabilivolt, discharge resistance, discharge switch, the power lead that signal lamp is powered is through the input of current transformer as circuit, second voltage dependent resistor (VDR) and current/voltage transfer resistance are parallel to the output terminal of mutual inductor, an output terminal of mutual inductor is connected in series an one-way conduction diode, the other end of diode is connected in series a current-limiting resistance again, the other end of current-limiting resistance receives one end of charging capacitor, the other end of charging capacitor receives another output terminal of current transformer, stabilivolt and one-way conduction diode are with consistent electric direction and receive electric capacity two ends, the two ends discharge circuit be composed in series by discharge resistance and discharge switch in parallel of stabilivolt, the forward output terminal of stabilivolt is low and high level, be connected to the I/O mouth of main control processor,
3) based on the power detecting method of capacitor charging time, mainly according under different capacity, to electric capacity be charged to time of a certain level different come the change of analog input end power; The power kind of the signal lamp that teleseme output terminal drives
, its respective signal lamp quantity be respectively
, the average power of above-mentioned different capacity kind signal lamp
described by following two formulas:
，
The voltage at electric capacity two ends and following three formulas are met to the charging current of electric capacity:
Wherein
for electric capacity C both end voltage,
for the capacitance of current line electric capacity in electric capacity C1 to Cn,
for the electric current to capacitor charging,
for the duration of charging,
for integral sign,
for integral operator, represent right
carry out integration,
for the voltage that one-way conduction diode cathode exports,
for resistance
arrive
the resistance of middle current line resistance,
for resistance
arrive
the resistance of middle current line resistance,
for the unit square wave function that frequency is 50Hz,
make
only have sinusoidal wave positive half period to capacitor charging,
for the quantity of current output terminal drive singal lamp,
for the power of a current output terminal signal lamp,
for signal lamp supply voltage,
for the turn ratio of current transformer,
for pressure drop during one-way conduction diode current flow; The voltage at electric capacity two ends is obtained by above three formula
with the duration of charging
relation as follows:
Export termination
high level is charged to during individual signal lamp
time
with output termination
high level is charged to during-1 signal lamp
time
be limited to two formulas below:
Obtain according to two formulas above
with
solution as follows:
be one and export termination
individual signal lamp and output termination
individual signal lamp is charged to the difference of high level time, wherein
with the quantity of drive singal lamp
inversely,
increase
reduce,
reduce
increase;
4) minimum resolution defining method: minimum resolution
it is the minimum duration of charging difference that detection system can effectively identify
,
limited size in following three conditions: the machine cycle of processor
, load end external interference cause duration of charging fluctuation
the duration of charging fluctuation caused is changed with testing circuit component parameter
,
size be directly proportional, as shown in the formula described to the sum that affects that above-mentioned three conditions produce respectively:
,
;
5) output terminal maximum drive singal lamp number determination method: the defining method of maximum signal lamp quantity N that detection system allows teleseme load end to drive is as shown in the formula described:
Solved by formula above
value, a load end of permission drive at most quantity N=[
]-1, [
] represent right
round, then the driving quantity that different capacity kind signal lamp allows meets:
;
6) described varying duty comprises following steps with the testing process of drive singal lamp fault detection system: the way being connected to signal lamp after system electrification by current information and information of voltage identification fault detection system input end or teleseme output terminal, the power that the corresponding duration of charging simulates this load end is gathered respectively at the output terminal being connected to signal lamp, circling measurment process is entered after identification completes, processor reads the current state information being connected to signal lamp output terminal, voltage status information, whether consistent with voltage status information by the current state information contrasting this output terminal, if inconsistent, send warning message, gathering duration of charging that output terminal is connected to signal lamp circuit deducts standard time in identifying, if difference is greater than minimum resolution
, then this output terminal has part signal lamp to be in malfunction, if difference is less than minimum resolution
, then the signal lamp of this output terminal all normally works, and after detecting that a certain output terminal breaks down, the failure message on this road is uploaded to traffic surveillance and control center by telecommunication circuit by primary processor,
7) duration of charging data acquisition and procession method: take voltage signal as synchronizing signal, energising is started, in signal lamp brightens by going out at a certain output terminal, the multiple data of continuous acquisition, gather three cycles respectively, and respectively multiple data that each cycle collects are sorted, remove maximal value and the minimum value in each cycle, again the data of three cycle remainders are sorted, ask for intermediate value, record intermediate value now as the standard value in a period of time Nei Gai road simulated power duration of charging; Circling measurment process: using the synchronizing signal of voltage signal as traffic light status, start in power on signal lamp brightens by going out at a certain output terminal, the multiple data of continuous acquisition, a maximal value and a minimum value is removed respectively to after its sequence, intermediate value is asked in remaining data, intermediate value is now deducted the intermediate value of this output terminal in identifying, if both differences are greater than minimum resolution
, then this output terminal emergent power declines, and has signal lamp to break down, if both differences are less than
, then the non-emergent power of output terminal declines, and the signal lamp of output terminal is all normal.
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|---|---|---|---|---|
| CN106652526B (en) * | 2016-12-28 | 2023-08-25 | 安徽科力信息产业有限责任公司 | Intelligent detecting device for signal machine circuit and control method thereof |
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