CN115420978A - Direct current charging pile metering inspection module, integrated detection device and method - Google Patents
Direct current charging pile metering inspection module, integrated detection device and method Download PDFInfo
- Publication number
- CN115420978A CN115420978A CN202211054381.2A CN202211054381A CN115420978A CN 115420978 A CN115420978 A CN 115420978A CN 202211054381 A CN202211054381 A CN 202211054381A CN 115420978 A CN115420978 A CN 115420978A
- Authority
- CN
- China
- Prior art keywords
- charging pile
- current
- sampling
- voltage
- metering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
- G01R22/063—Details of electronic electricity meters related to remote communication
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a direct current charging pile metering and polling module, integrated detection equipment and method, and belongs to the technical field of charging pile metering and detection. The current scheme does not disclose concrete detection circuitry, leads to portable combination formula to fill electric pile witnessed inspections and can't realize, influences and uses widely. According to the metering and routing inspection module for the direct current charging pile, the isolation conversion circuit, the isolation sampling discharge circuit, the first current sampling channel and the second current sampling channel are arranged, so that voltage monitoring of an auxiliary power supply of the charging pile and current collection in the charging process are realized, further, portable metering and routing inspection integrated detection of the direct current charging pile can be realized, and the metering and routing inspection module is simple and practical in scheme, feasible and beneficial to popularization and use. Furthermore, the auxiliary power supply of the charging pile is converted into the sampling side power supply of the isolated sampling discharge circuit by arranging the isolated conversion circuit, so that the detection device does not need to be externally connected with other power supplies or charged, and the detection efficiency can be effectively improved.
Description
Technical Field
The invention relates to a direct current charging pile metering and routing inspection module, integrated detection equipment and method, and belongs to the technical field of charging pile metering and detection.
Background
Along with fill electric pile service life's increase or fill electric pile manufacturing enterprise's technical merit discrepancy, it is very salient to fill electric pile to the compatible problem that the vehicle charges or fill electric pile and use the problem not up, so fill electric pile operation unit and need regularly patrol and examine the maintenance and fill electric pile, need portable diagnostic equipment to help troubleshooting in daily electric pile maintenance process conscientiously. Meanwhile, the market supervision bureau also provides clear supervision requirements for charging and charging electric energy measurement of the charging pile, and an operation unit is required to practically complete regular measurement and calibration of the charging pile so as to operate the online service. There is therefore a need in the industry for a device of this type to support charging post operation and verification.
Chinese patent (publication No. CN 213181837U) discloses a portable combined charging pile field detection device, which comprises mobile phone APP management software, a charging gun connection socket, a main control unit, an adjustable power load box resistor, an insulation resistance measurement module, an electrical parameter measurement module, a temperature and humidity sensor, a WIFI module and a rechargeable battery.
Above-mentioned scheme does not disclose concrete detection circuitry, leads to portable combination formula to fill electric pile witnessed inspections and can't realize, influences and uses widely.
Further, above-mentioned scheme, when detecting, need set up chargeable battery and supply power for detection device, the structure is comparatively complicated to charging for chargeable battery often, influencing detection efficiency, be unfavorable for using widely.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the direct current charging pile metering and inspection integrated detection module which is simple, practical and feasible and is beneficial to popularization and use, and realizes voltage monitoring of the auxiliary power supply of the charging pile and current acquisition in the charging process by arranging the isolation conversion circuit, the isolation sampling discharge circuit, the first current sampling channel and the second current sampling channel.
The invention also aims to provide the direct-current charging pile metering inspection module which is provided with the isolation conversion circuit, converts the auxiliary power supply of the charging pile into the sampling side power supply of the isolation sampling discharge circuit, does not need to be externally connected with other power supplies, is simple in structure and low in manufacturing cost, does not need to charge detection equipment, and can effectively improve the detection efficiency.
The invention also provides a direct current charging pile portable metering and routing inspection integrated detection device which is simple, practical and feasible in scheme and favorable for popularization and use.
The invention also aims to provide a direct-current charging pile portable metering and routing inspection integrated detection method which is detailed, practical and feasible and is beneficial to popularization and use.
In order to achieve one of the above objects, a first technical solution of the present invention is:
a metering and routing inspection module for a direct current charging pile comprises an auxiliary power supply voltage acquisition module and a two-channel high-precision current Hall sampling module;
the auxiliary power supply voltage acquisition module is used for monitoring the voltage of the auxiliary power supply of the charging pile and comprises an isolation conversion circuit and an isolation sampling discharge circuit;
the isolation conversion circuit is used for converting the auxiliary power supply of the charging pile into a sampling side power supply of the isolation sampling discharge circuit;
the isolation sampling discharge circuit is used for sampling the voltage of the port of the charging gun head;
the dual-channel high-precision current Hall sampling module is used for realizing current acquisition in the charging process and at least provided with a first current sampling channel and a second current sampling channel;
the first current sampling channel is used for sampling a current value smaller than 30A;
and the second current sampling channel is used for sampling a current value larger than 30A, so that high-precision measurement in different current ranges is realized.
Through continuous exploration and tests, the voltage monitoring of the charging pile auxiliary power supply and the current acquisition in the charging process are realized by arranging the isolation conversion circuit, the isolation sampling discharge circuit, the first current sampling channel and the second current sampling channel, so that the portable metering and routing inspection integrated detection of the direct-current charging pile can be realized, and the direct-current charging pile portable metering and routing inspection integrated detection system is simple and practical in scheme, feasible and beneficial to popularization and use.
Furthermore, the auxiliary power supply of the charging pile is converted into the sampling side power supply of the isolated sampling discharge circuit by arranging the isolated conversion circuit, so that the detection device does not need to be externally connected with other power supplies, has a simple structure and low manufacturing cost, does not need to charge detection equipment, and can effectively improve the detection efficiency.
As a preferable technical measure:
the isolation conversion circuit is provided with a chip F1205-1WR2 and is used for converting a 12V power supply into an isolated 5V power supply and supplying power to a sampling side of the isolation sampling discharge circuit;
the isolation sampling discharge circuit is provided with a chip AMC1200 and is used for sampling the analog voltage of the port A + and the port A-of the charging gun head.
As a preferable technical measure:
one side terminal of the chip F1205-1WR2 is electrically connected with the input filtering unit, and the other side terminal of the chip F1205-1WR2 outputs the filtering unit;
the input filtering unit is provided with a capacitor C16 and a capacitor C17 which are connected in parallel;
the output filtering unit is provided with an inductor L1, a capacitor C18 and a capacitor C19;
the capacitor C18 and the capacitor C19 are connected in parallel and are respectively connected with the inductor L1 in series.
As a preferable technical measure:
one side terminal of the chip AMC1200 is electrically connected with the resistance voltage division sampling unit, and the other side terminal is electrically connected with the differential sampling signal filtering unit;
the resistor voltage division sampling unit is provided with a resistor R8, a resistor R9 and a resistor R10 which are connected in series, so that a voltage signal meets the differential sampling range of the sampling chip;
the differential sampling signal filtering unit is provided with a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C13, a resistor R13 and a resistor R14.
As a preferable technical measure:
the first current sampling channel is provided with a first current sampling unit and a first second-order low-pass filtering unit;
the first current sampling unit is provided with a resistor R198B, a resistor R185B and a resistor R186B;
the resistor R185B and the resistor R186B are connected in parallel and are respectively connected with the resistor R198B in series;
the second-order low-pass filtering unit II is provided with a resistor R184B, a capacitor C155B, a resistor R188B and a capacitor C156B.
As a preferable technical measure:
the second current sampling channel is provided with a second current sampling unit, a second-order low-pass filtering unit and a wire-to-board connector P6;
the second current sampling unit is provided with a resistor R198, a resistor R185 and a resistor R186;
the resistor R185 and the resistor R186 are connected in parallel and are respectively connected with the resistor R198 in series;
the second-order low-pass filtering unit II is provided with a resistor R184, a capacitor C155, a resistor R188 and a capacitor C156;
the type of the wire-to-board connector P6 is HXDY 25003-3AN, and the wire-to-board connector is in four-wire communication with the Hall sensor, two wires supply power to the Hall sensor, and the other two wires output current signals of different channels.
In order to achieve one of the above objects, a second technical solution of the present invention is:
a portable metering and routing inspection integrated detection device for a direct current charging pile,
the system comprises a main control functional circuit module, a battery voltage simulation functional module, an auxiliary power supply integrated conversion module, a metering communication interface conversion functional module, a 7KW passive load functional module, an integrated high-low voltage relay matrix module, a direct current shunt integrated high-precision direct current electric energy metering module, a control system standby battery assembly and a shell;
the main control function circuit module is provided with the direct current charging pile metering inspection module.
Through continuous exploration and test, the portable metering and inspection integrated detection of the direct current charging pile is realized by arranging the main control function circuit module, the battery voltage simulation function module, the auxiliary power supply integrated conversion module, the metering communication interface conversion function module, the 7KW passive load function module, the integrated high-low voltage relay matrix module, the direct current shunt integrated high-precision direct current electric energy metering module and the control system standby battery component.
As a preferable technical measure:
the 7KW passive load functional module comprises a plurality of groups of self-research and development hot nickel-chromium flat wire load components, a heat dissipation air duct and a low-power-consumption heat-resistant heat dissipation fan component;
the integrated high-low voltage relay matrix module comprises a two-way main positive loop high-voltage large-current relay, a main auxiliary loop high-voltage large-current relay, a high-voltage small-current load switching relay, a high-voltage signal switching relay and a multi-path signal isolation relay;
the shell is an aluminum alloy functional structure and comprises a direct-current high-power supply interface for an externally-expanded load, a direct-current voltage acquisition signal interface, an emergency stop operation button, a CAN signal monitoring interface, a double-folding handle, a double-direct-current charging gun seat interface and a 7-inch high-definition display screen interface.
In order to achieve one of the above objects, a third technical solution of the present invention is:
a portable measurement and inspection integrated detection method of a direct current charging pile,
the portable metering and routing inspection integrated detection equipment for the direct current charging pile is adopted;
the method comprises a pre-constructed metering detection model, a charging pile normal charging automatic detection model and a charging pile abnormal response detection model;
the metering detection model is used for realizing current grading debugging from the charging pile to the vehicle and voltage error and current error detection of electric energy metering under different working conditions of small current and large current;
the charging pile normal charging automatic test model is used for simulating the functions of an electric vehicle;
the charging pile abnormal response detection model is used for optimizing the charging pile abnormal response detection function according to national standard interoperability detection and communication protocol consistency detection requirements.
Through continuous exploration and test, the portable metering and routing inspection integrated detection of the direct-current charging pile is realized through the metering detection model, the charging pile normal charging automatic detection model and the charging pile abnormal response detection model which are constructed in advance.
As a preferable technical measure:
a metrology inspection model comprising the following:
acquiring charged data of a charging pile, and comparing the charged data with data tested by a direct current shunt integrated high-precision direct current electric energy metering module to realize error calculation;
generating a metrological verification work order according to the calculation result and the two-dimension code communication rule of the operation and maintenance platform, realizing information transmission by using the two-dimension code, and finishing intelligent calculation, transmission and statistics of metrological detection;
fill electric pile normal charging automation test model, include following content:
the simulation electric automobile and the charging pile complete charging handshake rules specified in national standards, the simulation electric automobile and the charging pile utilize an auxiliary power supply of the charging pile to convert into isolated battery simulation voltage, and a high-voltage loop is put into the simulation electric automobile and the charging pile in time in the handshake process to meet the external voltage detection requirements of the charging pile;
after self-checking and mutual-checking of the charging pile are normal, voltage is output at a constant voltage, after the voltage is stabilized, a load assembly is put into use, and the battery voltage simulation function is quitted;
within N minutes of charging detection, after the output voltage and current of the charging pile are stable, a charging end instruction is sent, and the charging pile normally stops charging;
fill electric pile abnormal response detection model, including the following content:
setting a plurality of abnormal test items according to the operation and maintenance detection requirements, and realizing a charging pile abnormal response detection task at one time under the condition that the charging pile starting function is normal;
the abnormal test items at least comprise 30 detections, each detection automatically judges whether the charging pile normally responds or not, records are formed, after the detection is finished, the performance judgment is automatically realized, and the results are displayed on a local screen;
and the information transmission is realized by utilizing the two-dimension code.
Compared with the prior art, the invention has the following beneficial effects:
through continuous exploration and test, the voltage monitoring of the auxiliary power supply of the charging pile and the current collection in the charging process are realized by arranging the isolation conversion circuit, the isolation sampling discharge circuit, the first current sampling channel and the second current sampling channel, so that the portable metering and inspection integrated detection of the direct-current charging pile can be realized, and the direct-current charging pile integrated detection method is simple, practical, feasible and beneficial to popularization and use.
Furthermore, the auxiliary power supply of the charging pile is converted into the sampling side power supply of the isolated sampling discharge circuit by arranging the isolated conversion circuit, so that the detection device does not need to be externally connected with other power supplies, has a simple structure and low manufacturing cost, does not need to charge detection equipment, and can effectively improve the detection efficiency.
Furthermore, through continuous exploration and test, the portable metering and routing inspection integrated detection of the direct current charging pile is realized by arranging a main control function circuit module, a battery voltage simulation function module, an auxiliary power supply integrated conversion module, a metering communication interface conversion function module, a 7KW passive load function module, an integrated high-low voltage relay matrix module, a direct current shunt integrated high-precision direct current electric energy metering module and a control system standby battery assembly.
Furthermore, through continuous exploration and test, the portable metering and routing inspection integrated detection of the direct-current charging pile is realized through the metering detection model, the charging pile normal charging automatic detection model and the charging pile abnormal response detection model which are constructed in advance.
Drawings
FIG. 1 is a schematic diagram of an auxiliary power voltage acquisition module according to the present invention;
fig. 2 is a structural diagram of a charging gun head according to the present invention;
FIG. 3 is a structural diagram of the dual-channel high-precision current Hall sampling module according to the present invention;
FIG. 4 is a structural diagram of the main body of the integrated DC charging pile metering and detecting device of the present invention;
FIG. 5 is a schematic view of a dual head DC charging gun according to the present invention;
FIG. 6 is a schematic block diagram of the main functional circuit of the control system of the present invention
FIG. 7 is a schematic view of the internal structure of the structure of FIG. 4 according to the present invention;
fig. 8 is a view illustrating the structure of fig. 7 according to the present invention being converted to a certain angle.
Description of reference numerals:
1. a housing assembly; 2. a load system; 3. a power switch; 4. a data interface; 5. a charging interface; 6. an emergency stop button; 7. detecting an interface; 8. a handle; 9. a DC gun mount; 10. a DC contactor; 11. a screen; 12. a wake-up button; 13. an indicator light; 14. a DC charging stand; 15. a DC contactor; 16. a voltage simulation system; 17. a measurement comparison unit; 18. a main controller; 19. an auxiliary power supply; 20. an internal power supply; 21. and (4) externally expanding a load interface.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The invention relates to a specific embodiment of a direct current charging pile metering inspection module, which comprises the following steps:
a metering and routing inspection module for a direct current charging pile comprises an auxiliary power supply voltage acquisition module and a two-channel high-precision current Hall sampling module;
the auxiliary power supply voltage acquisition module is used for monitoring the voltage of the auxiliary power supply of the charging pile and comprises an isolation conversion circuit and an isolation sampling discharge circuit;
the isolation conversion circuit is used for converting the charging pile auxiliary power supply into a sampling side power supply of the isolation sampling discharge circuit;
the isolation sampling discharge circuit is used for sampling the voltage of the port of the charging gun head;
the double-channel high-precision current Hall sampling module is used for realizing current collection in the charging process and at least provided with a first current sampling channel and a second current sampling channel;
the first current sampling channel is used for sampling a current value smaller than 30A;
and the second current sampling channel is used for sampling a current value larger than 30A, so that high-precision measurement in different current ranges is realized.
As shown in fig. 1 and fig. 2, a specific embodiment of the auxiliary power supply voltage acquisition module of the present invention:
fill electric pile auxiliary power supply voltage acquisition module and choose isolated form differential voltage acquisition design scheme for use, adopt 1200 high withstand voltage isolated form simulation differential acquisition circuit chips, cooperation high isolation power supply voltage isolating circuit, the power supply monitoring of filling electric pile auxiliary power supply has been realized, realize charging rifle head A + A-auxiliary power supply's voltage acquisition promptly, thereby go to judge that to fill electric pile and charge to the vehicle of 12V power or to the vehicle of 24V power, GBT18487.1-2015 national standard has also stipulated that auxiliary power supply's voltage deviation should be controlled at 5% range in addition, so as to fill the check out test set of electric pile, the auxiliary power supply sampling unit that needs the design to fill electric pile, thereby judge whether the performance index of filling electric pile satisfies the standard requirement.
Fill electric pile auxiliary power supply voltage and gather the module and mainly include two parts: the DCDC isolation conversion unit taking F1205-1WR2 as a core mainly has the function of converting a 12V power supply of a detection system into an isolated 5V power supply and supplying power to a sampling side of an isolation amplifier AMC 1200. The capacitor C16 and the capacitor C17 are input filter units of the isolation power supply, and the inductor L1, the capacitor C18 and the capacitor C19 are output filter units of the isolation power supply.
An isolation sampling discharge unit with AMC1200 as a core mainly realizes isolation sampling of a charging pile auxiliary power supply, the AMC1200 is an isolation sampling chip with an 8-time amplification unit, resistors R8, R9 and R10 in a unit diagram realize resistor voltage division sampling, so that voltage signals meet the differential sampling range of the sampling chip, and a capacitor C9, a capacitor C100, a capacitor C11, a capacitor C13, a resistor R13 and a resistor R14 realize filtering of differential sampling signals.
A power supply unit which is in common with a main control MCU is adopted for supplying power to 5 pins and 8 pins of an AMC1200 chip, differential analog signals which are subjected to isolation amplification are output to the main control MCU for sampling by 6 pins and 7 pins, and the main control MCU is restored to a resistor voltage division side through calculation after sampling differential voltage, so that sampling of A + and A-analog voltage is realized.
According to the invention, other external power supplies are not needed, the system is supplied with power by adopting the charging pile auxiliary power supply, different charging pile types and use working conditions are different, the related voltage types are different, some charging pile types are isolated from other power utilization systems of the charging pile, and some charging pile types are shared with other charging pile operation systems.
The high-low voltage side of the 1200 series isolation differential sampling chip has high isolation withstand voltage, the internal part has 8 times of voltage gain amplification function, and the chip has low noise, low offset error, high common mode rejection ratio and other excellent performances and is a main use device designed by the invention. The MCU system collects the differential voltage signals, and high-precision measurement of the charging pile auxiliary power supply is achieved.
As shown in fig. 3, a specific embodiment of the dual-channel high-precision current hall sampling module of the present invention:
the dual-channel high-precision current Hall sampling module designed by the invention mainly realizes the current collection in the charging process, realizes the high-precision measurement on a large current model and a small current model, and has the large current precision range of 250A and the small current precision range of 30A.
The method and the device detect the direct current value output in the operation process of the direct current charging pile, thereby judging whether the charging pile normally outputs and judging the charging current precision. Because the output current range of charging pile is wider, the output current range allowed by national standard is 0-250A, and in order to realize the measurement accuracy under the large current and small current occasions, the project adopts the bi-pass Hall type current sensor to realize the acquisition of direct current.
When the data is smaller than 30A, the data of the low current channel A is used as an accurate data basis, and when the data is larger than 30A and smaller than 250A, the data of the high current channel B is used as an accurate data basis.
The wire-to-board connector P6 realizes four-wire communication with the Hall sensor, wherein two wires supply power to the Hall sensor and are used for outputting current signals of different channels. As shown in fig. 4, the upper and lower parts of the circuit have the same structure and the same parameter values.
In a small current channel, a resistor R198B, a resistor R185B and a resistor R186B realize current sampling of the channel and I-V conversion, a second-order low-pass filtering unit consisting of a resistor R184B, a capacitor C155B, a resistor R188B and a capacitor C156B realizes filtering of voltage signals after I-V conversion, and filtering cutoff frequency parameters are adjusted according to actual use environments, so that filtering of high-frequency interference signals is realized, and sampling data is more stable. The lower half and the upper half of the unit diagram are similar, and the description is omitted here.
In the invention, each channel adopts a resistance sampling and second-order low-pass passive filtering mode, and the TVS protection circuit realizes the protection of the analog port of the sampling MCU.
According to the double-channel high-precision current Hall sampling module, the current sampling values of the two channels are preliminarily judged, if the sampling value is smaller than the current sampling range value of the small channel, the current sampling value of the small channel is taken as the system current sampling, and if the sampling value of the current of the small channel is larger than the current range 30A of the small channel, the sampling value of the large current range is taken as the sampling current value of the system. Through the value judgment and switching of the large and small channels, high-precision circuit acquisition in the full current range is realized, and high-precision measurement in the whole current range is provided.
As shown in fig. 4-5, a specific embodiment of the portable metering and inspection integrated detection device for the direct-current charging pile of the invention is as follows:
the utility model provides a portable measurement of direct current fills electric pile and patrols and examines integration check out test set includes that integral type direct current fills electric pile measurement check out test set main part and double-end direct current rifle that charges.
The equipment mainly considers daily operation and maintenance and verification tasks of the charging pile, abandons wide and complicated full-function tests, extracts key test item functions and indexes of the daily operation and maintenance of the charging pile, integrates the functions and the indexes into a portable test device, realizes free selection of test functions, and meets diversified customization of test items; meanwhile, a metering calibration model is additionally arranged in the device, and the device and the electric automobile are connected through a double-head gun, so that electric energy metering verification under the conditions of low current and large current is realized.
As shown in fig. 6, 7 and 8, the integrated dc charging pile metering and detecting device main body comprises the following functional units:
1) The aluminum alloy functional structure shell comprises a direct-current high-power supply interface for an externally expanded load, a direct-current voltage acquisition signal interface, an emergency stop operation button, a CAN signal monitoring interface, a double-folding handle, a double-direct-current charging gun seat interface and a 7-inch high-definition display screen interface.
2) The multifunctional integrated functional circuit module comprises a main control functional circuit module, a battery voltage simulation functional module, an auxiliary power supply integrated conversion module and a metering communication interface conversion functional module.
3) The 7KW passive load functional module comprises a plurality of groups of self-research hot nickel-chromium flat wire load components, a heat dissipation air duct, a low-power-consumption heat-resistant heat dissipation fan component and the like
4) The integrated high-low voltage relay matrix module comprises a double-path main positive circuit high-voltage large-current relay, a main auxiliary circuit high-voltage large-current relay, a high-voltage small-current load switching relay, a high-voltage signal switching relay and a multi-path signal isolation relay.
5) The direct current shunt integrates a high accuracy direct current electric energy metering module.
The portable type direct current electric energy meter has the main innovation point that the detection of the electric energy used by the charging pile is realized by embedding the high-precision direct current electric energy meter on the basis of the portable type polling instrument of the charging pile.
Under the module, a direct current charging pile is connected with the system, the system is connected with an electric vehicle, a metering calibration model detection function option of the system is started, the charging pile is started, the vehicle is charged, after the charging is carried out for a period of time and the electric energy reaches a metering detection requirement level, the charging pile is stopped, the system acquires the charging electric energy E of the charging pile through CAN bus data capture, and the charging electric energy E of the charging pile is acquired t Simultaneously reading the high-precision metric value E of the invention j (ii) a The formula δ =Δ/L × 100% is calculated by the relative error:
and calculating the percentage of the metering error, recording the relative error in the database, and simultaneously displaying the relative error to operation and maintenance personnel.
6) The control system standby battery component comprises a shell component 1, a load system 2, a power switch 3, a data interface 4, a charging interface 5, an emergency stop button 6, a detection interface 7, a lifting handle 8, a direct current gun seat 9, a direct current contactor 10, a screen 11, a wake-up button 12, an indicator lamp 13, a direct current charging seat 14, a direct current contactor 15, a voltage simulation system 16, a metering comparison unit 17, a main controller 18, an auxiliary power supply 19, an internal power supply 20 and an external expansion load interface 21.
A housing assembly: the packaging and fixing device is used for packaging and fixing each functional unit;
a load system: the charging pile is used for completing low-power loading of the charging pile;
power switch (internal power supply): used for built-in power supply output control;
a data interface: for exporting test data, test files, log files, etc.;
charging interface (internal power supply): the charging device is used for charging the built-in power supply;
an emergency stop button: emergency stop for abnormal conditions during operation of the device;
and (3) detecting an interface: the system is used for measuring the charging parameters in real time in the detection process;
handle: the device is used for moving and revolving;
dc gun mount (input): the charging gun is used for connecting a charging pile;
dc contactor (main): the main loop is used for controlling the on-off of the main loop;
a screen: the function selection, parameter setting and data display are carried out;
a wake-up button: the method is used for awakening the main controller and the screen;
an indicator light: is used for displaying the working state of the device;
dc charging cradle (output): the double-head direct current charging gun is connected when the pile driving charging process is detected;
dc contactor (extended load): controlling the on-off of an outward-expanding load loop when the charging pile is in a high-power on-load state;
voltage simulation system: for simulating a vehicle battery voltage;
a measurement and comparison unit: the method is used for sampling voltage and current and comparing electric quantity;
a main controller: the device is used for controlling all functions of the device;
an auxiliary power supply: the device control system is used for supplying power to the device control system when the device is in a working state;
an internal power supply: the device control system is used for supplying power to the device control system when the device is in a non-working state;
external load interface: the connecting device is used for connecting a power cable and a communication cable of external load equipment.
The invention relates to a specific embodiment of a portable metering and verification integrated detection method for a direct-current charging pile, which comprises the following steps:
1) The equipment system of the invention functionally comprises a metering detection model, a charging pile normal charging automatic detection model and a charging pile abnormal response detection model.
2) The device comprises a charging pile, a CAN bus message monitoring control function of the device, a charging pile, a vehicle, a low-current model, a high-current model and the like, wherein the charging pile is connected with the device, the device is connected with an electric vehicle, the current grading debugging from the charging pile to the vehicle is realized through the CAN bus message monitoring control function of the device, the verification of electric energy metering (voltage error and current error) under different working conditions such as the low-current model and the high-current model is realized, the charged data of the charging pile is automatically obtained after the charging is finished, the data tested by the high-precision electric energy meter of the device are compared, the error calculation is realized, the calculation result is displayed on a local screen, meanwhile, a metering verification worksheet is generated according to a two-dimensional code communication rule of an operation and maintenance platform, a mobile phone APP code two-dimensional code is scanned, and the two-dimensional code is uploaded to the operation and maintenance platform, and the intelligent calculation, transmission and statistics of the metering detection are realized.
3) The invention discloses a normal charging automatic test model of a charging pile, which is the most direct operation and maintenance department and has the function of practical effect, and the main task of the operation and maintenance of the charging pile is to ensure the normal charging function of the charging pile. The device starts to output voltage at constant voltage after self-checking and mutual-checking of the charging pile are normal, the device is put into a load assembly after the voltage is stable, the battery voltage simulation function is quitted, and the device sends a charging ending instruction after the voltage and current output by the charging pile are stable within 5 minutes of automatic charging detection in a software process, so that the charging pile normally stops charging.
4) The charging pile abnormal response detection model is used for optimizing a charging pile abnormal response detection function under the conditions of national standard interoperability detection and communication protocol consistency detection requirements, abnormal test items can be edited according to operation and maintenance detection requirements, abnormal response detection tasks of the charging pile can be realized at one time only under the condition that the starting function of the charging pile is normal, up to 30 detections are realized by a main detection function, whether the charging pile is normally responded or not is automatically judged by each detection, a record is formed, after the detection is finished, performance judgment is automatically realized, the result is displayed on a local screen, and information transmission of a two-dimensional code is realized as described above.
The battery temperature is the unusual project of charging process danger relatively, and in electric automobile charging process, vehicle BMS is with filling electric pile interactive communication, if detect the temperature anomaly when too high that vehicle BMS corresponds, fills electric pile and according to national standard, will stop charging in 100 ms.
The method automatically simulates the abnormal overhigh temperature of the battery of the electric automobile in the charging process, sends the information through the CAN bus, starts to calculate at regular time, and judges that the charging pile does not meet the interoperation requirement if the high-voltage on the charging pile side is still output within the specified 100 ms.
The measurement and detection process mainly depends on relevant standards such as national standards GB T18487.1-2015, GBT 27930-2015, NBT33008.1.2-2018 and the like.
The portable metering and routing inspection integrated detection equipment for the direct-current charging pile realizes the integrated functional integrated design of daily operation and maintenance detection and metering and verification of the charging pile, has the weight of the whole equipment lower than 14kg, and has the size smaller than 450mm 250mm 405mm (length, width and height), and has very advantages in function and use of related traditional detection equipment.
The portable direct current charging pile metering and inspection integrated detection equipment provided by the invention detects the metering accuracy of the charging pile by adopting a real load method, uses a high-precision direct current electric energy metering technology in the portable direct current charging pile detection equipment, does not need to change any circuit of the charging pile in a charging pile field test, and automatically finishes metering and verification of the whole pile through comparison and detection of charging results.
And traditional electric energy meter measurement all will fill electric pile meter and tear open and get back to the institute of detecting, accomplishes the metrological verification of meter at school table bench, fills electric pile metrological verification occasion, so go on both extravagant time, extravagant manpower again, the meter that calibrates well simultaneously still can cause the inaccuracy of whole stake measurement owing to the installation of on-the-spot shunt uses the irregularity. The equipment skillfully utilizes a real-load method, and effectively realizes the metering verification according to the put-in-service charging pile under the condition of not wasting electric energy (the electric energy is stored in a charged vehicle).
The device is smaller and more flexible in volume, and under the limited space condition, the main detection project is realized through circuit design and software flow design simulation, the test work of operators on duty of the charging pile operation and maintenance unit is simplified, the test work can be finished without professional skills, the cost of the operation and maintenance unit is reduced, and powerful basic device support is provided for batch operation and maintenance verification work.
The two-dimensional code is used for completing the transmission mode of the test result of the whole machine, in the weak signal section, the operation and maintenance personnel only need to take a picture to record the test result two-dimensional code of each pile, the test recording work can be completed by leading the platform in the later stage again, and the operation and the record of the operation and maintenance unit are facilitated.
An embodiment of an apparatus to which the method of the invention is applied:
a computer apparatus, comprising:
one or more processors;
storage means for storing one or more programs;
when the one or more programs are executed by the one or more processors, the one or more processors are enabled to realize the above-mentioned portable metering and inspection integrated detection method for the direct current charging pile.
An embodiment of a computer medium to which the method of the invention is applied is:
a computer readable storage medium is stored with a computer program, and the computer program is executed by a processor to realize the portable metering and routing inspection integrated detection method for the direct current charging pile.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as methods, systems, computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A metering and routing inspection module of a direct current charging pile is characterized in that,
the device comprises an auxiliary power supply voltage acquisition module and a two-channel high-precision current Hall sampling module;
the auxiliary power supply voltage acquisition module is used for monitoring the voltage of the auxiliary power supply of the charging pile and comprises an isolation conversion circuit and an isolation sampling discharge circuit;
the isolation conversion circuit is used for converting the charging pile auxiliary power supply into a sampling side power supply of the isolation sampling discharge circuit;
the isolation sampling discharge circuit is used for sampling the voltage of the port of the charging gun head;
the dual-channel high-precision current Hall sampling module is used for realizing current acquisition in the charging process and at least provided with a first current sampling channel and a second current sampling channel;
the first current sampling channel is used for sampling a current value smaller than 30A;
and the second current sampling channel is used for sampling a current value larger than 30A, so that high-precision measurement in different current ranges is realized.
2. The metering inspection module of the direct current charging pile according to claim 1,
the isolation conversion circuit is provided with a chip F1205-1WR2 and is used for converting a 12V power supply into an isolated 5V power supply and supplying power to the sampling side of the isolation sampling discharge circuit;
the isolation sampling discharge circuit is provided with a chip AMC1200 and is used for sampling the analog voltage of the port A + and the port A-of the charging gun head.
3. The metering inspection module of the direct-current charging pile according to claim 2,
one side terminal of the chip F1205-1WR2 is electrically connected with the input filtering unit, and the other side terminal of the chip F1205-1WR2 outputs the filtering unit;
the input filtering unit is provided with a capacitor C16 and a capacitor C17 which are connected in parallel;
the output filtering unit is provided with an inductor L1, a capacitor C18 and a capacitor C19;
the capacitor C18 and the capacitor C19 are connected in parallel and are respectively connected with the inductor L1 in series.
4. The direct current charging pile metering inspection module according to claim 2,
one side terminal of the chip AMC1200 is electrically connected with a resistance voltage division sampling unit, and the other side terminal is electrically connected with a differential sampling signal filtering unit;
the resistor voltage division sampling unit is provided with a resistor R8, a resistor R9 and a resistor R10 which are connected in series, so that a voltage signal meets the differential sampling range of the sampling chip;
the differential sampling signal filtering unit is provided with a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C13, a resistor R13 and a resistor R14.
5. The metering and inspecting module of the direct-current charging pile according to claim 1,
the first current sampling channel is provided with a first current sampling unit and a first second-order low-pass filtering unit;
the first current sampling unit is provided with a resistor R198B, a resistor R185B and a resistor R186B;
the resistor R185B and the resistor R186B are connected in parallel and are respectively connected with the resistor R198B in series;
the second-order low-pass filtering unit II is provided with a resistor R184B, a capacitor C155B, a resistor R188B and a capacitor C156B.
6. The metering and inspecting module of the direct-current charging pile according to claim 1,
the second current sampling channel is provided with a second current sampling unit, a second-order low-pass filtering unit and a wire-to-board connector P6;
the second current sampling unit is provided with a resistor R198, a resistor R185 and a resistor R186;
the resistor R185 and the resistor R186 are connected in parallel and are respectively connected with the resistor R198 in series;
the second-order low-pass filtering unit II is provided with a resistor R184, a capacitor C155, a resistor R188 and a capacitor C156;
the wire-to-board connector P6 is HXDY HX25003-3AN and is in four-wire communication with the Hall sensor, two wires supply power to the Hall sensor, and the other two wires output current signals of different channels.
7. A portable metering and routing inspection integrated detection device for a direct current charging pile is characterized in that,
the system comprises a main control function circuit module, a battery voltage simulation function module, an auxiliary power supply integration conversion module, a metering communication interface conversion function module, a 7KW passive load function module, an integrated high-low voltage relay matrix module, a direct current shunt integrated high-precision direct current electric energy metering module, a control system standby battery assembly and a shell;
the main control function circuit module is provided with a direct current charging pile metering inspection module according to any one of claims 1 to 6.
8. The portable metering and inspection integrated detection device of the direct current charging pile according to claim 7,
the 7KW passive load functional module comprises a plurality of groups of self-developed hot nickel-chromium flat wire load components, a heat dissipation air duct and a low-power-consumption heat-resistant heat dissipation fan component;
the integrated high-low voltage relay matrix module comprises a double-path main positive loop high-voltage heavy current relay, a main auxiliary loop high-voltage heavy current relay, a high-voltage low-current load switching relay, a high-voltage signal switching relay and a multi-path signal isolation relay;
the shell is an aluminum alloy functional structure and comprises a direct-current high-power supply interface for an externally-expanded load, a direct-current voltage acquisition signal interface, an emergency stop operation button, a CAN signal monitoring interface, a double-folding handle, a double-direct-current charging gun seat interface and a 7-inch high-definition display screen interface.
9. A portable measurement and inspection integrated detection method for a direct current charging pile is characterized in that,
the portable metering and inspection integrated detection equipment for the direct current charging pile is adopted according to any one of claims 7 to 8;
the method comprises a pre-constructed metering detection model, a charging pile normal charging automatic detection model and a charging pile abnormal response detection model;
the metering detection model is used for realizing current grading debugging from the charging pile to the vehicle and voltage error and current error detection of electric energy metering under different working conditions of small current and large current;
the charging pile normal charging automatic test model is used for simulating the functions of an electric vehicle;
the charging pile abnormal response detection model is used for optimizing the charging pile abnormal response detection function according to national standard interoperability detection and communication protocol consistency detection requirements.
10. The portable metering and inspection integrated detection method of the direct current charging pile according to claim 9,
a metrology inspection model comprising the following:
acquiring charged quantity data of the charging pile, and comparing the charged quantity data with data tested by a direct current shunt integrated high-precision direct current electric energy metering module to realize error calculation;
generating a metrological verification work order according to the calculation result and the two-dimension code communication rule of the operation and maintenance platform, realizing information transmission by using the two-dimension code, and finishing intelligent calculation, transmission and statistics of metrological detection;
fill electric pile normal charging automation test model, including following content:
the simulation electric automobile and the charging pile complete charging handshake rules specified by national standards, an auxiliary power supply of the charging pile is utilized to convert the simulation voltage into isolated battery simulation voltage, and a high-voltage loop is timely put into the simulation voltage in the handshake process to meet the external voltage detection requirement of the charging pile;
after self-checking and mutual-checking of the simulation charging pile are normal, constant-voltage output is started, after the voltage is stabilized, a load assembly is put into use, and the battery voltage simulation function is quit;
within N minutes of charging detection, after the output voltage and current of the charging pile are stable, a charging end instruction is sent, and the charging pile normally stops charging;
fill electric pile abnormal response detection model, including the following content:
according to the operation and maintenance detection requirements, a plurality of abnormal test items are set, and under the condition that the charging pile starting function is normal, a charging pile abnormal response detection task is realized at one time;
the abnormal test items at least comprise 30 detections, each detection automatically judges whether the charging pile normally responds or not, records are formed, after the detection is finished, the performance judgment is automatically realized, and the results are displayed on a local screen;
and information transmission is realized by utilizing the two-dimension code.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211054381.2A CN115420978A (en) | 2022-08-31 | 2022-08-31 | Direct current charging pile metering inspection module, integrated detection device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211054381.2A CN115420978A (en) | 2022-08-31 | 2022-08-31 | Direct current charging pile metering inspection module, integrated detection device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115420978A true CN115420978A (en) | 2022-12-02 |
Family
ID=84199601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211054381.2A Pending CN115420978A (en) | 2022-08-31 | 2022-08-31 | Direct current charging pile metering inspection module, integrated detection device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115420978A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116436159A (en) * | 2023-03-24 | 2023-07-14 | 江苏泽宇智能电力股份有限公司 | Remote online inspection system with auxiliary monitoring function for transformer substation |
-
2022
- 2022-08-31 CN CN202211054381.2A patent/CN115420978A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116436159A (en) * | 2023-03-24 | 2023-07-14 | 江苏泽宇智能电力股份有限公司 | Remote online inspection system with auxiliary monitoring function for transformer substation |
| CN116436159B (en) * | 2023-03-24 | 2024-05-17 | 江苏泽宇智能电力股份有限公司 | Remote online inspection system with auxiliary monitoring function for transformer substation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105785175A (en) | Portable detection apparatus for alternating-current/direct-current charging pile | |
| CN109927933B (en) | Unmanned aerial vehicle steering engine automatic test system | |
| CN101967659A (en) | Online monitoring system for current distribution of aluminum electrolysis cell | |
| CN205809192U (en) | A kind of high-power charger test platform based on energy feedback electronic load instrument | |
| CN110286272B (en) | Wireless charging simulation test method and system | |
| CN213181837U (en) | Portable combined charging pile field detection device | |
| CN208207171U (en) | A kind of battery capacity tester | |
| CN111929587A (en) | Integrated detection method for power battery pack finished product | |
| CN115420978A (en) | Direct current charging pile metering inspection module, integrated detection device and method | |
| CN102946144A (en) | Transformer substation direct-current power supply information management system based on three-stage network architecture | |
| CN202978428U (en) | Substation direct current power supply information management system based on three-level network architecture | |
| CN109490790A (en) | Using the lithium dynamical battery power characteristic test method and device of compensated pulse method | |
| CN112285477A (en) | Integrated detection platform for AC/DC charging pile and field detection method for charging pile | |
| CN102175938A (en) | Electric vehicle conductive-charging interface temperature rise testing system | |
| CN110780260A (en) | System and method for checking electric energy error of direct current charger | |
| CN203502042U (en) | Multifunctional self-test instrument for automobile | |
| CN115932454A (en) | Portable direct current fills electric pile testing arrangement | |
| CN110888100A (en) | Single-phase intelligent electric energy meter online on-load detection system and method | |
| CN214174518U (en) | Performance testing device for battery management system | |
| CN211123230U (en) | Portable automatic debugging system for calibrator | |
| CN109460099A (en) | Electrical equipment surface temperature rise current tracking examination and adjustment device and the method for inspection | |
| CN211955739U (en) | Portable quick intermediate relay calibration equipment | |
| CN108983111A (en) | A kind of charging pile detection system | |
| CN209795860U (en) | Automatic test system for steering engine of certain unmanned aerial vehicle | |
| CN211826149U (en) | Test platform for train equipment power supply device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |