Testing system of direct current charging pile

Abstract

The invention provides a test system of a direct current charging pile. The test system comprises a programmable load; the I / O controller is connected with one end of the I / O controller after the plugs and the sockets of the different functional units of the direct current charging pile are butted; and the control system is used for outputting a control instruction to the I / O controller, so that the I / O controller outputs a driving signal to the functional units according to the control instruction to respectively perform on / off control. According to the invention, on-off of each function signal can be respectively controlled according to test case requirements, and automatic gun insertion and extraction, automatic card swiping authentication and automatic charging pile off-line and on-line in a charging pile system test process are realized. The system can automatically drive an emergency stop switch and an access control switch, automatically adjust the temperature change of a charging gun, automatically load and adjust the size of a load, and automatically achieve the power supply and outage of a charging pile, and does not need the manual intervention of a tester in the testing process, thereby solving the problem of poor consistency of manual operation, and improving the testing efficiency. And the test efficiency of aging test, repeatability test and the like can be greatly improved.

Description

Technical Field

[0001] This invention relates to the field of testing technology, and more specifically to a testing system for DC charging piles. Background Technology

[0002] During system testing of DC charging piles before software release, testers typically use DC charging piles and programmable resistive loads to build the test environment. During testing, the connection between the vehicle and the charging pile is established by manually plugging and unplugging the charging gun. When card authentication is required for charging tests, manual card swiping is performed. Offline / off-grid testing of the charging pile is usually conducted using a signal jammer or by manually inserting and removing the SIM (Subscriber Identity Module) card. Human-computer interaction testing also requires testers to manually operate the emergency stop switch, manually open and close the hatch, and manually tap the screen.

[0003] The above testing methods have the following shortcomings and defects: 1) Manually plugging and unplugging the charging gun by testers will result in poor operational consistency and make it impossible to conduct quantitative tests. Subjective errors caused by human factors will lead to misjudgment of measurement results, such as incorrect charging guide voltage due to poor plugging, and communication delay or loss with BMS (Battery Management System). Manual plugging and unplugging may also cause electric arcs due to operational errors, which may endanger personal safety.

[0004] 2) For card authentication tests that require multiple or periodic swipes, manual swiping is inefficient, and different swiping distances and angles result in different card reader signal strengths and response times.

[0005] 3) Offline testing of charging piles using a signal jammer or by manually inserting and removing SIM cards can result in interference with other devices due to a large signal jamming range. Manually inserting and removing SIM cards can easily cause card locking or damage to the card slot, and is not efficient when conducting multiple or periodic tests.

[0006] 4) The test results of human-machine interaction such as pressing the emergency stop switch and manually opening and closing the hatch are greatly affected by human factors due to the angle of opening and closing the hatch.

[0007] The above operations require testers to be stationed at the test site and perform manual operations continuously, which is particularly inefficient for aging tests and repeatability tests, increasing test costs. Summary of the Invention

[0008] To solve the above-mentioned technical problems, the present invention aims to provide a testing system for DC charging piles.

[0009] The technical solution adopted in this invention is as follows: An embodiment of the first aspect of the present invention provides a testing system for a DC charging pile, comprising: a programmable load, one end of which is connected to the charging gun of the DC charging pile, the programmable load having a built-in resistive load; an I / O (In / Out) controller, one end of which is connected to a functional unit of the DC charging pile; and a control system, the control system being connected to the other end of the programmable load via a network switch, and also connected to the other end of the I / O controller, the control system being used to output control commands to the I / O controller, so that the I / O controller outputs drive signals to the functional unit according to the control commands, thereby realizing the on / off control of the functional unit.

[0010] The DC charging pile testing system proposed in this invention may also have the following additional technical features: According to one embodiment of the present invention, the functional unit includes: a power supply unit, a gun insertion guide unit, an emergency stop unit, an access control sampling unit, a card swiping control unit, and an offline control unit; wherein, the plugs and sockets of the power supply unit, the gun insertion guide unit, the emergency stop unit, and the access control sampling unit are connected to one end of the I / O controller after being connected together, and the output terminals of the card swiping control unit and the offline control unit are connected to one end of the I / O controller.

[0011] According to an embodiment of the present invention, the above-mentioned DC charging pile testing system may further include: a USB (Universal Serial Bus) expansion dock, one end of which is connected to the control system; a meter communicator, one end of which is connected to the USB expansion dock and the other end of which is connected to the DC charging pile, for communicating with the charging pile's meter; a temperature simulator, one end of which is connected to the USB expansion dock and the other end of which is connected to the DC charging pile, for realizing controllable changes in the temperature collected by the charging pile; and a pile-end BMS communicator, one end of which is connected to the USB expansion dock and the other end of which is connected to the DC charging pile, for realizing communication with the charging pile's BMS.

[0012] According to one embodiment of the present invention, the temperature simulator includes: multiple resistors with different resistance values, multiple normally open relays, and a relay controller. The resistors are connected in series according to their resistance values ​​and then connected in parallel with the normally open relays. The relay controller is connected to the control terminal of the normally open relays. The temperature control command of the control system drives the relay controller to control the normally open relays after being converted with the USB expansion dock protocol, so as to realize arbitrary changes in the resistance value of the temperature simulator within a set range.

[0013] According to an embodiment of the present invention, the above-mentioned DC charging pile testing system further includes: a test computer, which is connected to the control system via a network switch. The test computer is used to interact with the control system, send test scripts to the control system so that the control system can perform automated testing of the DC charging pile according to the test scripts, and receive test data fed back by the control system.

[0014] According to one embodiment of the present invention, the I / O controller includes: an I / O expansion module, an opto-isolated repeater, and a control relay. The I / O expansion module communicates with the control system via an I²C (a serial communication bus). After receiving a command from the control system, the I / O expansion module outputs a high-level signal to the opto-isolated repeater. After receiving the high-level signal from the I / O expansion module, the opto-isolated repeater drives the relay contacts of the power supply unit, the gun insertion guide unit, the emergency stop unit, the access control sampling unit, the card swiping control unit, and the offline control unit to operate.

[0015] According to one embodiment of the present invention, the card swiping control unit includes: NFC (Near Field Communication) card bare label core material, wherein the pins on the coil of the NFC card bare label core material near the chip are disconnected and respectively connected to the normally open contacts of the card swiping control unit control relay of the I / O controller.

[0016] According to one embodiment of the present invention, the offline control unit includes: a SIM card external connector and a SIM card external slot. The SIM card built into the DC charging pile is removed and inserted into the SIM card external slot. One end of the SIM card external connector is inserted into the SIM card slot of the DC charging pile, and the other end of the SIM card external connector is connected to the control relay contact of the offline control unit of the I / O controller. The wiring harness of the SIM card external slot is connected to the control relay contact of the offline control unit.

[0017] According to one embodiment of the present invention, the test system is rack-mounted.

[0018] The beneficial effects of this invention are: This invention enables remote centralized control via a test computer and control system. It controls the on / off states of various functional signals according to test case requirements, achieving automatic charging gun insertion / removal, automatic card authentication, automatic offline / online charging pile operation during the charging pile system testing process. It also automatically drives emergency stop switches and access control switches, automatically adjusts charging gun temperature, automatically loads and adjusts load size, and automatically cuts off power to the charging pile. No manual intervention from test personnel is required during testing, solving the problem of inconsistent human operation and significantly improving the efficiency of aging and repeatability testing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a test system for a DC charging pile according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the wiring harness connection of the functional units of a test system for a DC charging pile according to an embodiment of the present invention; Figure 3 This is an arbitrary structural diagram of the I / O controller of a test system for a DC charging pile according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a test system for a DC charging pile according to another embodiment of the present invention; Figure 5 This is a schematic diagram of a temperature simulator according to an embodiment of the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Figure 1 This is a schematic diagram of the structure of a test system for a DC charging pile according to an embodiment of the present invention, as shown below. Figure 1 As shown, the test system for this DC charging pile includes: a programmable load, an I / O controller, and a control system.

[0022] One end of the programmable load is connected to the charging gun of the DC charging pile, and the programmable load has a built-in resistive load; one end of the I / O controller is connected to the functional unit of the DC charging pile; the control system is connected to the other end of the programmable load through a network switch, and the control system is also connected to the other end of the I / O controller. The control system is used to output control commands to the I / O controller, so that the I / O controller outputs drive signals to the functional unit according to the control commands, thereby realizing the on / off control of the functional unit.

[0023] Specifically, the control system is the core controller of the testing system. It has its own operating system and supports Modbus (a serial communication protocol) / PLC (Programmable Logic Controller) protocol expansion, as well as USB and Ethernet interface expansion. The programmable load has built-in resistive loads that support power recovery, and it has a built-in BMS communication protocol that conforms to national standards. Externally, it supports Ethernet, CAN (Controller Area Network), and serial communication. The I / O controller communicates with the control system via a protocol. A wiring harness connects the functional units within the DC charging pile to the I / O controller. The outputs of the card-swiping control unit and the offline control unit are connected to the I / O controller to receive control commands from the control system and send drive signals to drive the actions of each functional unit, thereby controlling their on / off states. This enables automatic plugging and unplugging of charging guns, automatic card authentication, automatic online / offline operation of the charging pile during system testing, as well as automatic activation of emergency stop switches, access control switches, automatic adjustment of charging gun temperature, automatic loading and adjustment of load size, and automatic power supply / disconnection of the charging pile. No manual intervention from test personnel is required during testing, solving the problem of inconsistent human operation and significantly improving the efficiency of aging and repetitive testing.

[0024] In one embodiment of the present invention, such as Figure 2 As shown, the functional units may include: a power supply unit, a charging gun guide unit, an emergency stop unit, an access control sampling unit, a card swiping control unit, and an offline control unit; after the plugs and sockets of the power supply unit, charging gun guide unit, emergency stop unit, and access control sampling unit of the DC charging pile are connected to one end of the I / O controller, and the outputs of the card swiping control unit and the offline control unit are connected to one end of the I / O controller.

[0025] Specifically, such as Figure 2 As shown, the plugs and sockets of the DC charging pile, including the power supply unit, plug-in guiding unit, emergency stop unit, and access control sampling unit, are connected to the I / O controller using a wiring harness. The outputs of the card swiping control unit and the offline control unit are connected to the I / O controller to receive control commands from the control system and send drive signals to drive the operation of each functional unit (power supply unit, plug-in guiding unit, emergency stop unit, access control sampling unit, card swiping control unit, and offline control unit). This controls the on / off state of each functional unit, enabling automatic plugging and unplugging of the charging gun, automatic card authentication, automatic online / offline operation of the charging pile during the charging pile system testing process, as well as automatic driving of the emergency stop switch, access control switch, automatic adjustment of charging gun temperature, automatic loading and adjustment of load size, and automatic power supply and disconnection of the charging pile.

[0026] In one embodiment of the present invention, such as Figure 3 As shown, the I / O controller includes: an I / O expansion module, an opto-isolated repeater, and a control relay.

[0027] Specifically, the I / O expansion module board expands to 16 I / O ports, supporting the simultaneous use of 4 expansion modules, expanding to 64 I / O ports. It communicates with the control system via the I²C bus, receiving commands from the control system and outputting a high-level signal to the opto-isolated repeater. The opto-isolated repeater, upon receiving the high-level signal from the I / O expansion module, drives the corresponding control relay contacts to actuate, thereby controlling the charging pile to perform on / off control, achieving commands such as power-off control and gun insertion control. It can be understood that there are multiple control relays, each controlling a functional unit. Using a wiring harness, the plugs and sockets inside the DC charging pile, which include power supply, gun insertion guidance, emergency stop sampling, and access control sampling functions, are connected to the corresponding relay contacts within the control relays. Depending on the software logic and control strategy, the normally open or normally closed contacts of the relays can be selected for connection.

[0028] In one embodiment of the present invention, the card swiping control unit includes: NFC card bare label core material, wherein the pins on the coil of the NFC card bare label core material near the chip are disconnected and respectively connected to the normally open contacts of the card swiping control unit control relay of the I / O controller.

[0029] Specifically, based on the principle that the coil on the NFC card receives the radio frequency signal from the card reader and generates a voltage to activate the chip through the magnetic field induced by the coil, the pins on the coil near the chip are disconnected and connected to the normally open contacts of the corresponding control relays. By remotely controlling the opening and closing of the relay coil to drive the contact action, the NFC card chip is powered and radio frequency signals are transmitted and received, thus achieving the purpose of card authentication and effectively preventing coil voltage attenuation and magnetic field interference.

[0030] In an embodiment of the present invention, the offline control unit includes: a SIM card external connector and a SIM card external slot. The SIM card built into the DC charging pile is removed and inserted into the SIM card external slot. One end of the SIM card external connector is inserted into the SIM card slot of the DC charging pile, and the other end of the SIM card external connector is connected to the control relay contact of the offline control unit of the I / O controller. The wiring harness of the SIM card external slot is connected to the control relay contact of the offline control unit.

[0031] Specifically, the SIM card built into the DC charging pile is removed and inserted into the external SIM card slot. One end of the external SIM card cable is inserted into the SIM card slot of the DC charging pile, and the other end is connected to the corresponding control relay contact. The wiring harness of the external SIM card slot is connected to the control relay contact, thus forming an offline control unit. The DC charging pile can be put into and taken offline by remotely controlling the operation of the relay.

[0032] like Figure 4 As shown, according to one embodiment of the present invention, the above-mentioned DC charging pile test system further includes: a USB expansion dock, a meter communicator, a temperature simulator, and a pile-end BMS communicator.

[0033] The system consists of a USB docking station connected to the control system at one end; a meter communicator connected to the USB docking station at one end and the DC charging pile at the other, used for communication with the charging pile's electricity meter; a temperature simulator connected to the USB docking station at one end and the DC charging pile at the other, used to controllably monitor temperature changes collected by the charging pile; and a BMS communicator connected to the charging pile at one end and the DC charging pile at the other, used for communication with the charging pile's BMS. Specifically, a USB expansion dock is used to intelligently allocate and distribute data with the electricity meter communicator, temperature simulator, and pile-end BMS communicator. The electricity meter communicator uses an RS485-to-USB adapter to connect to both the DC charging pile and the USB expansion dock; the temperature simulator uses an RS485-to-USB adapter to connect to the USB expansion dock; and the pile-end BMS communicator uses a CAN-to-USB adapter to connect to both the DC charging pile and the USB expansion dock.

[0034] In one specific embodiment of the present invention, such as Figure 5 As shown, the temperature simulator includes: multiple resistors with different resistance values, multiple normally open relays, and a relay controller. The resistors are connected in series according to their resistance values ​​and then connected in parallel with the normally open relays. The relay controller is connected to the control terminal of the normally open relays. The temperature control command of the control system is converted through the USB expansion dock protocol and then drives the relay controller to control the normally open relays to operate, so as to realize the arbitrary change of the resistance value of the temperature simulator within the set range.

[0035] Specifically, such as Figure 5 As shown, the resistors have an accuracy of 0.01%, and their resistance values ​​include 1Ω, 3Ω, 5Ω, 10Ω, 30Ω, 50Ω, 100Ω, 300Ω, 500Ω, 1KΩ, 3KΩ, and 5KΩ. All resistors are connected in series according to their resistance values ​​and then connected in parallel to the normally open contacts (NO and CO) of normally open relays K1-K16. The T+ and T- ports are connected to the DC charging pile. The relay controller supports RS485 and CAN communication. The default resistance value is 11.11KΩ. Based on the control system instructions and the USB docking station protocol conversion, the relay controller drives the normally open relays K1 to K16 to operate, bypassing the resistors connected in parallel on the corresponding relays to achieve arbitrary changes in the temperature simulator resistance value from 1Ω to 11.11KΩ. By connecting the input DC charging pile sampling unit through a wiring harness, common temperature sensors can be simulated. The temperature simulator enables controllable acquisition of charging pile temperature changes, solving the problem of manually adjusting potentiometers to achieve temperature changes during charging pile temperature measurement.

[0036] In one specific embodiment of the present invention, such as Figure 4 As shown, the aforementioned DC charging pile testing system also includes: a test computer, which is connected to the control system via a network switch. The test computer is used to interact with the control system, send test scripts to the control system so that the control system can perform automated testing of the DC charging pile according to the test scripts, and receive test data fed back from the control system.

[0037] Specifically, the test computer supports test script creation, viewing test progress, controlling test methods and test schedule, and printing test reports.

[0038] In an embodiment of the present invention, the testing system can be rack-mounted and freely movable, facilitating switching tests on different charging piles and overcoming the drawback of existing testing fixtures that remain stationary when moved.

[0039] In summary, this invention achieves the insertion and removal of the charging gun by controlling the on / off state of the charging control guidance unit, thus solving the problem of frequent manual insertion and removal of the charging gun during testing, reducing testing pressure and the risk of electric shock. It also achieves card authentication by remotely controlling the on / off state of the NFC card coil, controlling the power supply to the NFC card chip and the transmission of the card-swiping radio frequency signal, thus solving the problem of manual card swiping by testers. Furthermore, it enables the charging pile to go offline and online by connecting an external SIM card and controlling the on / off state of the SIM card pins, solving the problem of needing a signal jammer or manual insertion and removal of the SIM card during offline testing, while also preventing card locking issues caused by frequent SIM card insertion and removal. The invention also enables controllable acquisition of charging pile temperature changes through a temperature simulator, solving the problem of needing to manually adjust the potentiometer to measure temperature changes during charging pile temperature measurement. Finally, it enables remote control of the charging pile's power-off and power-on via commands, solving the problem of needing testers to manually operate the circuit breaker during testing. Finally, it simulates emergency stop pressing and resetting, and door opening and closing by controlling the on / off state between the DC charging pile's emergency stop switch, access control switch, and feedback sampling circuit board, eliminating the need for manual operation by testers.

[0040] according to Figure 4 The test system for the DC charging pile shown is configured to use a network switch to establish Ethernet communication with the test computer, control system, DC charging pile, and programmable load. A USB docking station is used to intelligently allocate and distribute data with the meter communicator, temperature simulator, and pile-end BMS communicator. The charging gun of the DC charging pile is inserted into the gun holder of the programmable load, and it does not need to be unplugged during the test. Figure 2The diagram shows the wiring harness topology for connecting the DC charging pile and the control relay. Connect the wiring harness between the DC charging pile and the test system. Place the card reader control unit against the card reader area of ​​the charging pile and connect it to the control relay. Connect the offline control unit to the DC charging pile's SIM card slot and the control relay respectively.

[0041] After setting up the test environment, test scripts can be written using the test computer. Based on the test cases and test scripts, automated testing of DC charging piles can be achieved.

[0042] The DC charging pile testing system according to an embodiment of the present invention enables remote centralized control of the test computer and the control system. It controls the on / off states of various functional signals according to the test case requirements, achieving automatic plugging / unplugging of charging guns, automatic card authentication, automatic offline / online operation of the charging pile during the testing process, as well as automatic activation of emergency stop switches, access control switches, automatic adjustment of charging gun temperature, automatic loading and adjustment of load size, and automatic power supply / disconnection of the charging pile. No manual intervention from test personnel is required during the testing process, which not only solves the problem of inconsistent human operation but also greatly improves the testing efficiency of aging tests and repeatability tests.

[0043] Furthermore, the test environment setup of the test system of this invention is simple and quick. All connection harnesses use connectors, eliminating the complex disassembly and assembly preparation work required before testing traditional systems. All tests are fully automated, requiring no manual intervention from test personnel. Customizable test scripts allow for flexible and varied testing processes. Test processes and conclusions are stored and uploaded in real-time by the control system, facilitating inspection and analysis, and overcoming the difficulty in reproducing existing test processes. This invention supports multi-scenario charging reproduction, providing test evidence for resolving user-side issues and R&D defects. The extensive expandability of the control system and I / O controller in this invention provides sufficient space for system testing of new functions and methods of DC charging piles, overcoming the shortcomings of existing test methods being singular and lacking scalability.

[0044] In the description of this invention, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Any process or method description in the flowcharts or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logical functions or processes, and the scope of preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order according to the functions involved, as should be understood by those skilled in the art to which embodiments of the invention pertain.

[0045] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0046] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A test system of a direct current charging pile, characterized in that, The application relates to a programmable load, an I / O controller, a control system and a USB expansion dock. The programmable load is connected with a charging gun of a direct-current charging pile at one end, and a resistive load is built in the programmable load. The I / O controller is connected with a functional unit of the direct-current charging pile at one end. The control system is connected with the other end of the programmable load through a network switch, and the control system is also connected with the other end of the I / O controller.

2. The test system of the direct current charging pile according to claim 1, characterized in that, The control system is used for outputting a control instruction to the I / O controller, so that the I / O controller outputs a driving signal to the functional unit according to the control instruction, and realizes on / off control of the functional unit. The functional unit comprises a power supply unit, a gun insertion guiding unit, an emergency stop unit, an access control sampling unit, a card swiping control unit and an offline control unit.

3. The testing system of the direct current charging pile according to claim 1, characterized in that, The plugs and sockets of the power supply unit, the gun insertion guiding unit, the emergency stop unit and the access control sampling unit are connected with one end of the I / O controller after being connected with each other. The USB expansion dock is connected with the control system at one end. The electric meter communicator is connected with the USB expansion dock at one end and with the direct-current charging pile at the other end, and is used for communicating with a charging pile electric meter. The temperature simulator is connected with the USB expansion dock at one end and with the direct-current charging pile at the other end, and is used for realizing controllable change of temperature collected by the charging pile. The pile-end BMS communicator is connected with the USB expansion dock at one end and with the direct-current charging pile at the other end, and is used for realizing communication with a charging pile BMS.

4. The testing system of the direct current charging pile according to claim 3, characterized in that, The temperature simulator comprises a plurality of resistors with different resistance values, a plurality of normally open relays and a relay controller. The temperature control instruction of the control system drives the relay controller to control the normally open relays to move after protocol conversion with the USB expansion dock, so as to realize arbitrary change of the resistance value of the temperature simulator within a set range.

5. The testing system of the direct current charging pile according to claim 1, characterized in that, The test computer is connected with the control system through a network switch, and is used for data interaction with the control system, sending a test script to the control system, so that the control system realizes automatic test of the direct-current charging pile according to the test script, and receiving test data fed back by the control system. The I / O controller comprises an I / O expansion module, an optoelectronic isolation repeater and a control relay.

6. The testing system of direct current charging pile according to claim 1, characterized in that, The I / O expansion module communicates with the control system through an I2C bus, and outputs a high-level signal to the optoelectronic isolation repeater after receiving a control system instruction. The optoelectronic isolation repeater drives the relay contact of the power supply unit, the gun insertion guiding unit, the emergency stop unit, the access control sampling unit, the card swiping control unit and the offline control unit to move after receiving the high-level signal from the I / O expansion module.

7. The testing system of direct current charging pile according to claim 6, characterized in that, The card swiping control unit comprises an NFC card bare tag core material, a pin close to a chip on a coil of the NFC card bare tag core material is disconnected and connected to a normally open contact of a card swiping control unit control relay of an I / O controller respectively.

8. The testing system of the direct current charging pile according to claim 6, characterized in that, The offline control unit comprises a SIM card external wire, a SIM card external card slot, a SIM card built in a direct current charging pile is pulled out and inserted into the SIM card external card slot, one end of the SIM card external wire is inserted into a SIM card slot of the direct current charging pile, the other end of the SIM card external wire is connected to a control relay contact of an offline control unit of an I / O controller, and a wire harness of the SIM card external card slot is connected to the control relay contact of the offline control unit.

9. The test system of direct current charging pile according to any one of claims 1-8, characterized in that, The test system is packaged by a cabinet.

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