CN105973313A - Electric vehicle charging pile safety monitoring system based on fiber grating - Google Patents
Electric vehicle charging pile safety monitoring system based on fiber grating Download PDFInfo
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- CN105973313A CN105973313A CN201610537691.8A CN201610537691A CN105973313A CN 105973313 A CN105973313 A CN 105973313A CN 201610537691 A CN201610537691 A CN 201610537691A CN 105973313 A CN105973313 A CN 105973313A
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- charging pile
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- fiber grating
- temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B19/00—Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow
Abstract
The invention provides an electric car charging pile safety monitoring system based on fiber grating. The system includes a fiber detection optical cable and a signal demodulation and analysis system. The fiber detection optical cable is directly integrated with a communication optical fiber that is possessed by an electric car charging pile. The fiber detection optical cable is in series connection to a plurality of fiber grating sensors each of which includes a pressure sensor, a vibration sensor and a temperature sensor. The signal demodulation and analysis system includes a signal demodulation module, a housing opening and closing state monitoring module, an anti-sabotage monitoring module and a temperature monitoring module. The signal demodulation module is connected to the fiber detection optical cable and determines signal type of each peak in accordance with positions of peak signals of different fiber grating sensors returned by the fiber detection optical cable, and demodulates all kinds of signals in accordance with corresponding demodulation methods, and subsequently transmits all kinds of demodulation signals to corresponding monitoring modules. Each monitoring module compares respective demodulation signals with preset values, and if a demodulation signal exceeds a preset value, then each monitoring module sends an alarm signal.
Description
Technical field
The present invention relates to a kind of charging pile safety monitoring field, particularly relate to a kind of electric automobile based on fiber grating and fill
Electricity stake safety monitoring system.
Background technology
The development of automobile causes the excessive consumption of earth resource.The tellurian energy is limited, and energy scarcity is complete
The increasingly severe problem of facing mankind.The energy problem of China has become as the strategic issue of the national economic development, if
Continue according to traditional energy power system development, it may be difficult to continue the rise of this vast automobile superpower of China.Faced by
Resource scarcity and environmental protection problem, Development of EV becomes the main trend of automobile industry development.
The development key of electric automobile is the development of charging technique.The appearance of electric automobile charging pile can not only solve
The problem that electric automobile charges whenever and wherever possible, additionally it is possible to electrokinetic cell is safeguarded.Electric automobile charging pile major part at present
It is positioned at unattended region, so safety monitoring and maintenance to charging pile itself are problem demanding prompt solutions.
Fiber grating sensing technology is the wireless sensor networks that developed recently gets up, and can carry out multiple different physical quantities
Monitoring (including: temperature, strain, pressure, displacement, pressure, acceleration etc.), has on-the-spot passive lightning protection explosion-proof, weather-proof, safety can
Lean on, length in service life, the advantage such as highly sensitive, measurement scope is wide, networking capability is strong, be highly suitable to be applied for safety monitoring neck
Territory.
Fiber grating sensing technology is combined with the actual monitored demand of electric automobile charging pile, designs a kind of full light
Fine monitoring system, can be to different kinds of parameters such as charging pile internal operating temperature, housing states, and the destruction of electric automobile charging pile
Strick precaution etc. carries out on-line monitoring, will promote the lifting of electric automobile charging pile monitoring operation and management level.
Summary of the invention
The present invention is directed to safety monitoring and the defect of maintenance deficiency to charging pile itself in prior art, it is provided that Yi Zhong electricity
The technical scheme of electrical automobile charging pile safety monitoring, the program utilizes fiber grating sensing technology, to electric automobile charging pile
Every state parameter carries out real-time monitoring, to provide safety information timely.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of electric automobile charging pile safety monitoring system based on fiber grating is provided, including fiber-optic probe optical cable and
Signal solution harmonic analysis system；
Concatenate multiple fiber-optic grating sensor on described fiber-optic probe optical cable, including pressure transducer, vibrating sensor and
Temperature sensor；
Signal solution harmonic analysis system comprises signal demodulation module, housing on off state monitoring modular, tamper-proof monitoring mould
Block and temperature monitoring module；
Described signal demodulation module, according to the crest signal of the different fiber-optic grating sensors that fiber-optic probe optical cable returns
Sequence of positions judges the signal classification belonging to each crest, and is demodulated various types of signal according to corresponding demodulation mode, it
After all kinds of demodulated signals are sent to the monitoring modular of correspondence；
Respective demodulated signal is compared by each monitoring modular with preset value, if beyond preset value, then sending warning
Signal.
In electric automobile charging pile safety monitoring system based on fiber grating of the present invention, described housing switch shape
The pressure detection signal that state monitoring modular receiving signal demodulation module is sent, and compare with the pressure threshold T1 pre-set
Relatively, if certain some institute pressure measurement force value is less than T1, then it is assumed that now charging pile housing is opened or loosens, and system sends the report of correspondence
Alert signal.
In electric automobile charging pile safety monitoring system based on fiber grating of the present invention, described housing switch shape
State monitoring modular being provided with housing status monitoring hand switch, if manually overhauling, then closing this housing status monitoring hands
Dynamic switch, to avoid triggering unnecessary warning.
In electric automobile charging pile safety monitoring system based on fiber grating of the present invention, described tamper-proof monitoring
The vibration detecting signal that module receiving signal demodulation module is sent, and compare with vibration detecting signal amplitude T2 pre-set
Relatively, if more than T2, then carry out signal mode identification, it is judged that disturbing signal is artificial malicious sabotage or environmental disturbances.
In electric automobile charging pile safety monitoring system based on fiber grating of the present invention, in signal mode identification
The recognizer used includes thresholding algorithm, similarity measurement, neutral net, decision tree and support vector machine.
In electric automobile charging pile safety monitoring system based on fiber grating of the present invention, described temperature monitoring mould
The temperature detection signal that block receiving signal demodulation module is sent, and compare with the temperature threshold T3 pre-set, when certain is supervised
When measuring point measured temperature value is higher than T3, then charging pile operating temperature is too high, and system sends the alarm signal of correspondence；When charging pile work
Exceed threshold value certain time as temperature, then send linkage instruction to charging pile control circuit, control charging pile and stop externally charging.
In electric automobile charging pile safety monitoring system based on fiber grating of the present invention, fiber grating reflection light
Centre wavelength with strain and the relational expression of variations in temperature be:
In formula, Δ λBKnots modification for fiber grating reflection wavelength；ε is the strain at fiber grating along optical fiber direction；ΔT
Variable quantity for temperature；p11And p12Elasto-optical coefficient for fiber grating；μ is the Poisson's ratio of fiber optic materials；αδAnd ξδFor optical fiber material
The thermal coefficient of expansion of material and thermo-optical coeffecient；The changing value of strain and temperature is calculated by the knots modification of wavelength.
In electric automobile charging pile safety monitoring system based on fiber grating of the present invention, this system also includes using
Family monitoring client, receives housing on off state monitoring modular, information that tamper-proof monitoring modular, temperature monitoring module are sent showing
Monitoring picture, this detection picture is directly displayed by figure, word, the form of form.
In electric automobile charging pile safety monitoring system based on fiber grating of the present invention, pressure transducer with fill
The cap of electricity stake housing is connected；Vibrating sensor is fixed on charging pile case inside；Temperature sensor is close within charging pile
Circuit.
The beneficial effect comprise that: the present invention uses all-fiber to monitor system, sensor probe simple in construction, size
Little, flexing flexibly can be carried out according to installation environment and lay, convenient later maintenance and holding concurrently well with existing communication optical cable
Hold.And sensing optic cable outdoor is passive, weather-proof lightning protection, electromagnetism interference, in the course of the work will not produce electric spark, will not be to quilt
The safety of monitoring object causes extra threat.The present invention can be to the thing of the multiple Safety Influence Factors of electric automobile charging pile
Reason amount is monitored and analyzed, and unusual condition is carried out early warning exactly, simultaneously as the measurement of different kinds of parameters can share
Optical cable and main process equipment, reduce complexity and the repair and maintenance difficulty of electric automobile charging pile monitoring device.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is embodiment of the present invention electric automobile charging pile based on fiber grating safety monitoring system structure chart；
Fig. 2 is embodiment of the present invention electric automobile charging pile structural representation.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right
The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, not
For limiting the present invention.
The present invention utilizes fiber grating sensing technology, and every state parameter of electric automobile charging pile is carried out real-time prison
Survey, to provide safety information timely.
Embodiment of the present invention electric automobile charging pile based on fiber grating safety monitoring system includes fiber-optic probe optical cable
And signal solution harmonic analysis system.
Together with fiber-optic probe optical cable communications optical cable existing with electric automobile charging pile is directly integrated.
Concatenate multiple fiber-optic grating sensor on the fiber-optic probe optical cable of the embodiment of the present invention, including pressure transducer, shake
Dynamic sensor and temperature sensor.
Signal solution harmonic analysis system comprises signal demodulation module, housing on off state monitoring modular, tamper-proof monitoring mould
Block and temperature monitoring module.
Described signal demodulation module, is connected with fiber-optic probe optical cable, the different optical fiber light returned according to fiber-optic probe optical cable
The sequence of positions of the crest signal of gate sensor judges the signal classification belonging to each crest, and according to corresponding demodulation mode pair
Various types of signal is demodulated, and all kinds of demodulated signals are sent to the monitoring modular of correspondence afterwards.
Respective demodulated signal is compared by each monitoring modular with preset value, if beyond preset value, then sending warning
Signal.
As in figure 2 it is shown, pressure transducer is connected with the cap of charging pile housing；Vibrating sensor is fixed on charging pile housing
Inner side；The circuit within charging pile is close in temperature sensor.
Described housing on off state monitoring modular, the pressure detection signal that receiving signal demodulation module is sent, according to reality
Situation, arranges pressure threshold T1.If certain some institute pressure measurement force value is less than T1, then it is assumed that now charging pile housing is opened or pine
Dynamic, system should send the alarm signal of correspondence.This module is provided with housing status monitoring hand switch, if manually overhauling,
Housing state monitoring switch should be closed in advance, it is to avoid trigger unnecessary warning.
Described tamper-proof monitoring modular, the vibration detecting signal that receiving signal demodulation module is sent, when signal amplitude exceedes
Threshold value T2, then proceed by signal mode identification, it is judged that disturbing signal is that artificial malicious sabotage or environmental disturbances are (such as large car
The larger vibration that process causes).Recognizer used may select: thresholding algorithm, similarity measurement, neutral net, decision tree,
Support vector machine isotype recognizer.T2 artificially can be arranged according to practical situation.
Described temperature monitoring module, the temperature detection signal that receiving signal demodulation module is sent, according to practical situation, arrange
Temperature threshold T3 (recommended value: 50 DEG C).When certain monitoring point measured temperature value is higher than T3, then it is assumed that charging pile operating temperature is too high,
System sends the alarm signal of correspondence.When charging pile operating temperature exceedes threshold value certain time (recommended value: 60s), should be to charging
Stake control circuit sends linkage instruction, makes charging pile stop externally charging.This module also can arrange state of temperature and monitor from dynamic circuit breaker
Electric switch, reaches certain time when charging pile operating temperature exceedes threshold value, and charging pile will automatically power off to ensure safety.
As it is shown in figure 1, the system of the embodiment of the present invention also includes user monitoring end, it is used for receiving the monitoring of housing on off state
The information that module, tamper-proof monitoring modular, temperature monitoring module are sent, monitoring picture graphically, the form such as word, form direct
Display.Consult in time for user and process.
The vibration detecting signal that tamper-proof monitoring modular receiving signal demodulation module is sent, arranging vibration threshold is T2, when
Signal amplitude exceedes threshold value T2, then proceed by signal mode identification, it is judged that disturbing signal is artificial malicious sabotage or large-scale
Vehicle is through the vibration caused.Recognizer used may select: thresholding algorithm, similarity measurement, neutral net, decision tree,
Hold vector machine isotype recognizer.
Can gather in advance: vibration signal and the vehicle of weight impact charging pile housing are each through the vibration signal sample caused
From some groups, form Sample Storehouse.Measured signal is carried out Similarity Measure respectively with the sample of signal of known class in Sample Storehouse.
If the number that the similarity of measured signal and certain class known sample is more than 0.5 exceedes half, then measured signal is classified as this type of.If
Being unsatisfactory for this condition, then it is assumed that be unknown classification, preserving this segment data in case analyzing.
The fiber-optic probe optical cable of the present invention becomes one with fibre-optic telecommunication cable, and real-time monitoring signal is through Communication ray
Cable is passed back, after return signal is demodulated and analyzes by system, it may be judged whether send corresponding safety alarm.Optical fiber grating sensing
Optical cable can be directly integrated by communications optical cable existing with electric automobile charging pile, and the fibre core as vacant with communications optical cable directly enters
Row concatenation welding, has higher technical feasibility.
Multiple fiber-optic grating sensor it is serially connected with, including pressure transducer, vibrating sensor, temperature on fiber-optic probe optical cable
Sensor, concatenates in a fixed order.
Mounting means schematic diagram is specifically shown in Fig. 2, but is not limited to this kind of mounting means.
11 mounting means of fiber bragg grating pressure sensor: be connected with the cap of charging pile housing.
The mounting means of optical fiber raster vibration sensor 12: be fixed on charging pile case inside.
The mounting means of fiber-optical grating temperature sensor 13: be close to the circuit within charging pile.
Mounting means schematic diagram is specifically shown in Fig. 2, but is not limited to this kind of mounting means.
If charging pile is equipped with communications optical cable, it is possible to use fibre core vacant in communications optical cable, will as transmission cable
Fibre Optical Sensor (sensing optic cable) concatenation is entered, if the most not reserved vacant fibre core, can additionally arrange transmission cable, i.e.
A piece single-mode fiber.Due to the volume of fiber-optic grating sensor own little (being exactly an optical cable from the appearance), again due to light
The physical characteristic of cable itself, therefore, it is possible to flexing is laid flexibly.
Fiber grating pressure, temperature, vibrating sensor are positioned over the internal suitable position of charging pile i.e. according to the actual requirements
Can, it is relatively independent system in fact with charging pile.Pressure transducer should be positioned over the position that charging pile cap is easily unlocked,
Vibrating sensor should be positioned over charging pile and be most susceptible to the position (such as bottom) of impact failure, and temperature sensor should be positioned over fills
Electricity rifle cable and near circuitry, it is simple to thermometric.Owing to being fiber grating class sensor, can be by single-mode fiber (i.e. transmission cable)
Directly concatenation.
Described signal demodulation module, according to the sequence of positions of close echo peak-to-peak signal, (concatenation of fiber-optic grating sensor is suitable
Sequence), it is judged that the signal classification (pressure, vibration, temperature) belonging to each crest, and according to corresponding demodulation mode to various types of signal
It is demodulated.Afterwards various types of signal is sent to the research and application module of correspondence.
Concrete demodulation mode is as follows:
The Fiber Bragg Grating FBG extraneous measured change of mobile sensing by optical grating reflection wavelength.When broadband light is at light
In fibre during transmission, the light of the wavelength meeting Bragg condition is reflected.The cycle of grating and effective refractive index can change reflection
The wavelength of light.And the variable such as strain and temperature leads to the change of screen periods and effective refractive index, such that it is able to use light
Fine Bragg grating carries out sensing measurement to these physical descriptors.The centre wavelength of fiber grating reflection light becomes with strain and temperature
The relational expression changed is:
In formula, Δ λBKnots modification for fiber grating reflection wavelength；ε is the strain at fiber grating along optical fiber direction；ΔT
Variable quantity for temperature；p11And p12Elasto-optical coefficient for fiber grating；μ is the Poisson's ratio of fiber optic materials；αδAnd ξδFor optical fiber material
The thermal coefficient of expansion of material and thermo-optical coeffecient.Therefore, the changing value of strain and temperature can be obtained by wavelength variable quantity.
When fiber grating is the most affected by temperature, its centre wavelength variation delta λBResponse to variations in temperature is permissible
It is expressed as:
When the effect that fiber grating is the most strained, its centre wavelength variation delta λBResponse to strain can represent
For:
Measure owing to the physical quantity such as acceleration, power can be converted into strain, so it is the most applicable with pressure to measure vibration
Formula (3).
The present invention gives full play to fiber grating sensing technology electromagnetism interference, electric insulation, corrosion-resistant, safety good, the life-span
Long, it is easy to networking, the advantage such as telemeasurement.Utilize fiber grating sensing technology to realize electric automobile charging pile housing to switch
State, tamper-proof, the real time on-line monitoring of the different kinds of parameters such as operating temperature, each on affect electric automobile charging pile safe operation
Item index carries out real-time analysis and evaluation；Simultaneously as the measurement of different kinds of parameters can share optical cable and main process equipment, reduce electricity
The complexity of electrical automobile charging pile monitoring device and repair and maintenance difficulty.
The electric automobile charging pile safety monitoring method realized according to the present invention, it is possible to obtain following beneficial effect:
(1) safety monitoring method of electric automobile charging pile of the present invention, uses all-fiber monitoring system, sensor probe
Simple in construction, size is little, can carry out flexing flexibly according to installation environment and lay, convenient later maintenance and energy and existing communication
Optical cable compatible with.
(2) sensing optic cable outdoor is passive, weather-proof lightning protection, electromagnetism interference, will not produce electric spark, no in the course of the work
The safety of monitored target can be caused extra threat, and the write technique of grating is the most ripe, it is simple to form scale raw
Produce.
(3) safety monitoring method of electric automobile charging pile of the present invention, it is possible to many to electric automobile charging pile
The physical quantity planting Safety Influence Factors is monitored and analyzed, and unusual condition is carried out early warning exactly, simultaneously as multiple
The measurement of parameter can share optical cable and main process equipment, reduces complexity and the repair and maintenance of electric automobile charging pile monitoring device
Difficulty.
(4) monitoring picture graphically, the form such as word, form directly display, can feedback monitoring result in time.
It should be appreciated that for those of ordinary skills, can be improved according to the above description or be converted,
And all these modifications and variations all should belong to the protection domain of claims of the present invention.
Claims (9)
1. an electric automobile charging pile safety monitoring system based on fiber grating, it is characterised in that include fiber-optic probe light
Cable and signal solution harmonic analysis system；
Multiple fiber-optic grating sensor is concatenated, including pressure transducer, vibrating sensor and temperature on described fiber-optic probe optical cable
Sensor；
Signal solution harmonic analysis system comprise signal demodulation module, housing on off state monitoring modular, tamper-proof monitoring modular and
Temperature monitoring module；
Described signal demodulation module, is connected with fiber-optic probe optical cable, and the different fiber gratings returned according to fiber-optic probe optical cable pass
The sequence of positions of the crest signal of sensor judges the signal classification belonging to each crest, and according to corresponding demodulation mode to all kinds of
Signal is demodulated, and all kinds of demodulated signals are sent to the monitoring modular of correspondence afterwards；
Respective demodulated signal is compared by each monitoring modular with preset value, if beyond preset value, then sending alarm signal.
Electric automobile charging pile safety monitoring system based on fiber grating the most according to claim 1, it is characterised in that
The pressure detection signal that described housing on off state monitoring modular receiving signal demodulation module is sent, and with the pressure pre-set
Threshold value T1 compares, if certain some institute pressure measurement force value is less than T1, then it is assumed that now charging pile housing is opened or loosens, system
Send the alarm signal of correspondence.
Electric automobile charging pile safety monitoring system based on fiber grating the most according to claim 2, it is characterised in that
Being provided with housing status monitoring hand switch in described housing on off state monitoring modular, if manually overhauling, then closing should
Housing status monitoring hand switch, to avoid triggering unnecessary warning.
Electric automobile charging pile safety monitoring system based on fiber grating the most according to claim 1, it is characterised in that
The vibration detecting signal that described tamper-proof monitoring modular receiving signal demodulation module is sent, and believe with the vibration detecting pre-set
Number amplitude T2 compares, if more than T2, then carries out signal mode identification, it is judged that disturbing signal is artificial malicious sabotage or ring
Border is disturbed.
Electric automobile charging pile safety monitoring system based on fiber grating the most according to claim 4, it is characterised in that
Recognizer employed in signal mode identification includes thresholding algorithm, similarity measurement, neutral net, decision tree and support
Vector machine.
Electric automobile charging pile safety monitoring system based on fiber grating the most according to claim 1, it is characterised in that
The temperature detection signal that described temperature monitoring module receiving signal demodulation module is sent, and enter with the temperature threshold T3 pre-set
Row compares, and when certain monitoring point measured temperature value is higher than T3, then charging pile operating temperature is too high, and system sends the alarm signal of correspondence
Number；When charging pile operating temperature exceedes threshold value certain time, then send linkage instruction to charging pile control circuit, control charging pile
Stop externally charging.
Electric automobile charging pile safety monitoring system based on fiber grating the most according to claim 1, it is characterised in that
The centre wavelength of fiber grating reflection light with the relational expression of strain and variations in temperature is:
In formula, Δ λBKnots modification for fiber grating reflection wavelength；ε is the strain at fiber grating along optical fiber direction；Δ T is temperature
The variable quantity of degree；p11And p12Elasto-optical coefficient for fiber grating；μ is the Poisson's ratio of fiber optic materials；αδAnd ξδFor fiber optic materials
Thermal coefficient of expansion and thermo-optical coeffecient；The changing value of strain and temperature is calculated by the knots modification of wavelength.
Electric automobile charging pile safety monitoring system based on fiber grating the most according to claim 1, it is characterised in that
This system also includes that user monitoring end, reception housing on off state monitoring modular, tamper-proof monitoring modular, temperature monitoring module are sent out
Next information also shows monitoring picture, and this detection picture is directly displayed by figure, word, the form of form.
Electric automobile charging pile safety monitoring system based on fiber grating the most according to claim 1, it is characterised in that
Pressure transducer is connected with the cap of charging pile housing；Vibrating sensor is fixed on charging pile case inside；Temperature sensor is tight
Patch circuit within charging pile.
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| CN111650461A (en) * | 2020-06-22 | 2020-09-11 | 成都艾默泰克科技有限公司 | Charging pile testing system and testing method thereof |
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| US11247578B2 (en) | 2018-11-14 | 2022-02-15 | Ford Global Technologies, Llc | Electric charging stations with docking management and methods of use |
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