Direct current charging pile field verification auxiliary device and method

Abstract

The invention provides an auxiliary device and method for field verification of a direct current charging pile, and is applied to the field of electronic power, and the device comprises a first communication assembly, a second communication assembly and a latch, a first input port and a first output port of the first communication assembly are connected with a direct current charging pile to be calibrated, a second output port of the first communication assembly is connected with the second communication assembly, and a second input port of the first communication assembly is connected with an output end of the latch; a first input port of the second communication assembly is connected with the first communication module, a first output port of the second communication assembly is connected with a data input end of the latch, and a second output port and a second input port of the second communication assembly are connected with a vehicle-mounted battery. According to the direct current charging pile field verification auxiliary device provided by the invention, the stable output of the current of the direct current charging pile can be ensured while the vehicle-mounted battery is used as a load, so that the verification work complexity is reduced, the cost is saved, and the normal operation of the verification work is ensured.

Description

Technical Field

[0001] The present application relates to the field of electronic power, and in particular to an auxiliary device and method for on-site calibration of a DC charging pile. Background Art

[0002] Traditional on-site calibration of charging piles requires the use of charging pile calibration equipment and loads, and the loads currently used are mostly resistive loads. When using existing loads for calibration, it is often necessary to open the cabinet door for on-site wiring, which increases the difficulty of the work and poses a high safety hazard. In addition, charging stations are relatively scattered, and vans are required during the transportation of loads, which increases the cost of on-site calibration work.

[0003] This application uses the vehicle battery as a load to perform on-site calibration of the charging pile, so as to achieve the purpose of not opening the cabinet door and facilitating transportation. However, when using a DC charging pile to charge the vehicle battery, the DC charging pile and the vehicle battery continuously communicate through messages to adjust the current output by the DC charging pile, resulting in frequent changes in the current, which cannot provide a stable environment for calibration. Summary of the invention

[0004] In view of the problems in the prior art, the present application provides a DC charging pile on-site calibration auxiliary device and method, which can at least partially solve the problems in the prior art.

[0005] In a first aspect, the DC charging pile on-site verification auxiliary device provided by the present application includes: a first communication component, a second communication component, and a latch for latching a requested current of a vehicle battery;

[0006] The first input port and the first output port of the first communication component are connected to the DC charging pile to be tested, the second output port is connected to the first input port of the second communication component, and the second input port is connected to the output end of the latch;

[0007] The first output port of the second communication component is connected to the data input terminal of the latch, and the second output port and the second input port are connected to the vehicle battery.

[0008] It also includes: a single-pole double-throw switch, a first end of which is connected to the enable end of the latch, and a second end of which is switched between a high level and a ground end.

[0009] Among them, it also includes: a comparator;

[0010] The output terminal of the latch is also connected to the first input terminal of the comparator;

[0011] The first output port of the second communication component is also connected to the second input terminal of the comparator;

[0012] The second end of the single-pole double-throw switch is switched to be connected between a high level and an output end of the comparator.

[0013] Wherein, the comparator is a numerical comparator, and the output terminal of the numerical comparator connected to the latch outputs a high level when input data of a first input terminal of the numerical comparator is greater than input data of a second input terminal.

[0014] Wherein, the comparator is an analog comparator, and further comprises: a first digital-to-analog conversion circuit and a second digital-to-analog conversion circuit;

[0015] The first digital-to-analog conversion circuit is arranged between the output terminal of the latch and the first input terminal of the comparator;

[0016] The second digital-to-analog conversion circuit is arranged between the first output port of the second communication component and the second input terminal of the comparator;

[0017] The first input terminal of the comparator is a positive input terminal, and the second input terminal of the comparator is a negative input terminal.

[0018] Among them, it also includes: a register and a subtractor;

[0019] The first input terminal of the subtractor is connected to the output terminal of the latch, and the second input terminal is connected to the register;

[0020] The output end of the subtractor is connected to the second input port of the first communication component.

[0021] Wherein, it also includes: a switch, which is arranged between the second input port of the first communication component and the first output port of the second communication component and is connected in parallel with the latch.

[0022] The invention also includes: a first memory and a second memory;

[0023] The first memory is connected to the second output port of the first communication component;

[0024] The second memory is connected to the first output port of the second communication component.

[0025] Wherein, it also includes: a metering component, which is arranged between the second output port of the first communication component and the first input port of the second communication component.

[0026] Wherein, it also includes: a power supply connected to the first communication component and the second communication component.

[0027] In a second aspect, the present application further provides a DC charging pile on-site verification auxiliary method, which is implemented by a server based on the DC charging pile on-site verification auxiliary device provided in the above embodiments, including:

[0028] Obtain the output current value of the DC charging pile at the previous moment, the output current value at the current moment, and the interval between two output currents from the first communication component, obtain the requested current value of the vehicle battery at the current moment from the second communication component, and determine the output current change rate of the charging pile at the current moment according to the output current value at the previous moment, the output current value at the current moment, and the interval between two output currents;

[0029] Input the output current value at the previous moment, the output current value at the current moment, and the previously acquired hidden state data at the previous moment into the forget gate to obtain the memory weight at the current moment;

[0030] Input the output current value at the previous moment, the output current value at the current moment, the output current change rate of the charging pile at the current moment, and the previously acquired hidden state data at the previous moment into the input gate to obtain the updated data at the current moment;

[0031] Inputting the memory weight, the updated data at the current moment and the previously acquired cell state data at the previous moment into the cell state unit to determine the cell state data at the current moment;

[0032] The output current value at the previous moment, the output current value at the current moment, the hidden state data at the previous moment and the cell state data are input into the output gate to determine the hidden state data at the current moment;

[0033] Determine whether the DC charging pile is faulty based on the hidden status data.

[0034] The DC charging pile on-site verification auxiliary device and method provided by the present application realizes the parsing and encapsulation of the communication message between the DC charging pile and the vehicle battery by setting the first communication component and the second communication component, and by setting the latch, when the latch enable end is at a low level, the data in the latch no longer changes, thereby sending a constant message request to the DC charging pile, and ensuring the stable output of the DC charging pile current while using the vehicle battery as a load. At the same time, it is possible to further judge whether the DC charging pile is faulty based on the verification data. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a circuit diagram of a DC charging pile charging a vehicle battery in the prior art;

[0037] Figure 2 It is a structural schematic diagram of a DC charging pile on-site verification auxiliary device provided in one embodiment of the present application;

[0038] Figure 3 It is a structural schematic diagram of a DC charging pile on-site verification auxiliary device provided in one embodiment of the present application;

[0039] Figure 4 It is a structural schematic diagram of a DC charging pile on-site verification auxiliary device provided in one embodiment of the present application;

[0040] Figure 5 It is a structural schematic diagram of a DC charging pile on-site verification auxiliary device provided in one embodiment of the present application;

[0041] Figure 6 It is a structural schematic diagram of a DC charging pile on-site verification auxiliary device provided in one embodiment of the present application;

[0042] Figure 7 It is a structural schematic diagram of a DC charging pile on-site verification auxiliary device provided in one embodiment of the present application;

[0043] Figure 8 It is a structural schematic diagram of a DC charging pile on-site verification auxiliary device provided in one embodiment of the present application;

[0044] Fig. 9 This is a schematic diagram of a DC charging pile verification network provided in an embodiment of the present application;

[0045] Fig.10 It is a flow chart of a DC charging pile on-site calibration auxiliary method provided in some embodiments of the present application.

[0046] Explanation of symbols

[0047] 100 DC charging piles

[0048] 200 Car battery

[0049] 301 First communication component

[0050] 302 Second communication component

[0051] 303 Latch

[0052] 304 SPDT switch

[0053] 305 Comparator

[0054] 306 first digital-to-analog conversion circuit

[0055] 307 Second digital-to-analog conversion circuit

[0056] 308 Registers

[0057] 309 Subtractor

[0058] 310 Switch

[0059] 311 First Memory

[0060] 312 Second Memory

[0061] 313 Metering Components

[0062] 314 Power supply DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solution and advantages of the embodiments of the present application more clear, the embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Here, the illustrative embodiments of the present application and their descriptions are used to explain the present application, but are not intended to limit the present application.

[0064] Figure 1 Schematic diagram of the circuit when a DC charging pile charges a vehicle battery in the prior art. Figure 1 As shown, the DC charging pile 100 is directly connected to the vehicle battery 200 and communicates with it. The vehicle battery 200 sends a charging request to the DC charging pile 100 according to the current required for charging, for example, requesting a current of 100A from the DC charging pile 100. After receiving the request, the DC charging pile 100 outputs a current of 100A to the vehicle battery 200. However, due to the difference in current measurement between the DC charging pile 100 and the vehicle battery 200, and the influence of the resistance of the connecting line between the DC charging pile 100 and the vehicle battery 200, the current received by the vehicle battery 200 is often not equal to the current output by the DC charging pile 100. For example, the current received by the vehicle battery 200 is 80A. At this time, the vehicle battery 200 informs the DC charging pile 100 of the current currently received, adjusts the current demand, and requests the current again. For example, it informs the DC charging pile 100 that the current received at this time is 80A and requests to output a current of 120A. Afterwards, the DC charging pile 100 and the vehicle battery 200 repeat the above operation until the current received by the vehicle battery 200 becomes 100 A. During this process, the current output by the DC charging pile 100 changes frequently, resulting in the inability to perform the test normally.

[0065] In order to solve the above problems, the present application proposes a DC charging pile on-site calibration auxiliary device to achieve stable output of DC charging pile current when using a vehicle battery as a load.

[0066] Figure 2 is a schematic diagram of the structure of a DC charging pile on-site verification auxiliary device provided in an embodiment of the present application, such as Figure 2As shown, the DC charging pile on-site verification auxiliary device provided by the present application includes: a first communication component 301, a second communication component 302 and a latch 303 for latching the requested current of the vehicle battery;

[0067] The first input port 301a1 and the first output port 301b1 of the first communication component 301 are connected to the DC charging pile 100 to be tested, the second output port 301b2 is connected to the first input port 302a1 of the second communication component 302, and the second input port 301a2 is connected to the output end 303c of the latch 303;

[0068] The first output port 302 b 1 of the second communication component 302 is connected to the data input terminal 303 a of the latch 303 , and the second output port 302 b 2 and the second input port 302 a 2 are connected to the vehicle battery 200 .

[0069] Specifically, the current output by the DC charging pile 100 flows through the first communication component 301 and the second communication component 302 and is then transmitted to the vehicle battery 200. At the same time, the first communication component 301 also receives the communication message sent by the DC charging pile 100, and parses the message to obtain the magnitude of the current output by the DC charging pile 100, for example, 100A, and transmits the parsed value to the second communication component 302. After receiving the value sent by the first communication component 301, the second communication component 302 repackages the value into a message and forwards it to the vehicle battery 200.

[0070] Afterwards, the vehicle battery 200 readjusts the size of the requested current according to the actual size of the received current, encapsulates the actual size of the received current and the size of the new requested current into a message, and sends it to the second communication component 302 through the second input port 302a2 of the second communication component 302. After receiving the message from the vehicle battery 200, the second communication component 302 parses the message and transmits the size of the requested current to the data input terminal 303a of the latch 303 through the first output port 302b1 of the second communication component 302.

[0071] When the enable end 303b of the latch 303 receives a high level, the latch 303 receives the data output by the first output port 302b1 of the second communication component 302 and updates the latched data; when the enable end 303b of the latch 303 receives a low level, the data latched by the latch 303 cannot be changed. Regardless of whether the data output by the first output port 302b1 of the second communication component 302 is the same as the data in the latch 303, the data latched in the latch 303 remains unchanged and is transmitted by the latch 303 from the output end 303c to the second input port 301a2 of the first communication component 301. The first communication component 301 encapsulates the received value into a message and sends it to the DC charging pile 100.

[0072] The DC charging pile on-site calibration auxiliary device provided in the present application sets a latch between the first output port of the first communication component and the second input port of the second communication component. When the enable end of the latch is set to a low level, no matter what current request is made by the vehicle battery, the data in the latch always remains unchanged, and the unchanged data is transmitted to the DC charging pile through the second communication module, thereby ensuring that the request data received by the DC charging pile remains unchanged, and the DC charging pile can output current stably, providing a stable environment for calibration work.

[0073] The first communication component 301 and the second communication component 302 parse, encapsulate and forward the message through the communication protocol. The first communication component 301 and the second communication component 302 can be implemented using an existing switching chip, such as chip AR9327.

[0074] In one embodiment, further, Figure 2 As shown, the DC charging pile on-site verification auxiliary device provided in the present application also includes: a single-pole double-throw switch 304, whose first end 304a is connected to the enable end 303b of the latch 303, and the second end 304b is switched between a high level and a ground end.

[0075] Specifically, after the vehicle battery 200 is connected to the DC charging pile 100, the second end 304b of the single-pole double-throw switch 304 is connected to a high level to store the magnitude of the current requested by the vehicle battery 200 in the latch 303. Afterwards, the second end 304b of the single-pole double-throw switch 304 is connected to the ground terminal so that the data in the latch 303 cannot be changed, thereby ensuring that the magnitude of the requested current in the request received by the DC charging pile 100 remains unchanged, and the DC charging pile 100 can output a stable current.

[0076] However, the present application is not limited thereto, and the enable terminal 303 b of the latch 303 may be connected to any component that can switch between high and low levels or control high and low level outputs.

[0077] Figure 3 is a schematic diagram of the structure of a DC charging pile on-site verification auxiliary device provided in an embodiment of the present application. Figure 2 On the basis of the embodiment, further, the DC charging pile on-site verification auxiliary device provided by the present application further includes: a comparator 305;

[0078] The output terminal 303c of the latch 303 is also connected to the first input terminal 305a of the comparator 305; the first output port 302b1 of the second communication component 302 is also connected to the second input terminal 305b of the comparator 305; the second terminal 304b of the single-pole double-throw switch 304 is switched between the high level and the output terminal 305c of the comparator 305.

[0079] Specifically, after the vehicle battery 200 is connected to the DC charging pile 100, the second end 304b of the single-pole double-throw switch 304 is connected to a high level to store the magnitude of the current requested by the vehicle battery 200 in the latch 303. Afterwards, the second end 304b of the single-pole double-throw switch 304 is connected to the output end of the comparator 305. The two input ends of the comparator 305 receive the data output by the second communication component 302 and the latch 303 respectively, so as to compare the magnitude of the current requested by the vehicle battery 200 with the magnitude of the data latched by the latch 303. When the data latched by the latch 303 is greater than the magnitude of the current requested by the vehicle battery 200, it indicates that the current output by the DC charging pile 100 is greater than the current required by the vehicle battery 200. At this time, the output terminal 305c of the comparator 305 outputs a high level to the enable terminal 303b of the latch 303, thereby updating the data latched in the latch 303 to reduce the current output by the DC charging pile 100, prevent the output current from being too large and exceeding the rated current of the vehicle battery 200, thereby affecting the service life of the vehicle battery 200 and even creating a safety hazard.

[0080] In one embodiment, further, the comparator 305 is a numerical comparator, and the output terminal of the numerical comparator connected to the latch outputs a high level when the input data of the first input terminal 305a of the numerical comparator is greater than the input data of the second input terminal 305b.

[0081] Specifically, the existing numerical comparator often includes three output terminals, and the three output terminals respectively output a high level when the input data at the first input terminal 305a is larger, smaller, or equal to the input data at the second input terminal 305b, and output a low level otherwise. The output terminal that outputs a high level when the input data at the first input terminal 305a of the numerical comparator is larger than the input data at the second input terminal 305b is connected to the enable terminal 303b of the latch 303, thereby ensuring that the data in the latch 303 is updated only when the current output by the DC charging pile 100 is larger, otherwise, the data in the latch 303 remains unchanged, thereby ensuring the stable output of the current of the DC charging pile 100.

[0082] In one embodiment, further, the comparator 305 is an analog comparator. In this case, Figure 4As shown, the DC charging pile on-site calibration auxiliary device provided by the present application also includes: a first digital-to-analog conversion circuit 306 and a second digital-to-analog conversion circuit 307; the first digital-to-analog conversion circuit 306 is arranged between the output terminal 303c of the latch 303 and the first input terminal 305a of the comparator 305; the second digital-to-analog conversion circuit 307 is arranged between the first output port 302b1 of the second communication component 302 and the second input terminal 305b of the comparator 305; the first input terminal 305a of the comparator 305 is a positive input terminal, and the second input terminal 305b of the comparator 305 is a reverse input terminal.

[0083] Specifically, the first digital-to-analog conversion circuit 306 and the second digital-to-analog conversion circuit 307 can be implemented by an existing DAC circuit or by using a digital-to-analog converter. The present application does not limit the specific implementation of the digital-to-analog conversion circuit. The first digital-to-analog conversion circuit 306 is used to convert the output data of the latch 303 from a digital signal to an analog signal and then input it into the positive input terminal of the analog comparator. The second digital-to-analog conversion circuit 307 is used to convert the data output by the second communication component 302 from a digital signal to an analog signal and then input it into the reverse input terminal of the analog comparator. When the input data at the positive input terminal of the analog comparator is greater than the input data at the reverse terminal, the analog comparator outputs a high level, otherwise it outputs a low level.

[0084] The DC charging pile on-site calibration auxiliary device provided in the present application realizes comparison between the vehicle battery request data and the data latched in the latch by setting a comparator and connecting the first input end of the comparator to the output end of the latch, and connecting the second input end of the comparator to the first output end of the second communication unit. When the latched data is large, the data in the latch is updated, thereby preventing the DC charging pile from outputting excessive current and wasting the service life of the vehicle battery, while avoiding safety accidents.

[0085] Figure 5 It is a structural diagram of a DC charging pile on-site calibration auxiliary device provided by an embodiment of the present application. On the basis of the above embodiments, the DC charging pile on-site calibration auxiliary device provided by the present application further includes: a register 308 and a subtractor 309; the first input terminal 309a of the subtractor 309 is connected to the output terminal 303c of the latch 303, and the second input terminal 309b is connected to the register 308; the output terminal 309c of the subtractor 309 is connected to the second input port 301a2 of the first communication component 301.

[0086] Specifically, the register 308 is used to store a fixed value, and the subtractor 309 subtracts the value stored in the register 308 from the output data of the latch 303 and sends it to the first communication component 301. The value stored in the register 308 can be set according to actual conditions such as the rated current of the vehicle battery 200.

[0087] For example, the rated current of the vehicle battery 200 is 100A, and the data stored in the register 308 can be set to 20. When the vehicle battery 200 issues a current request of 100A for the first time, the latch 303 latches 100 and transmits the value to the subtractor 309. The subtractor 309 subtracts the value 20 stored in the register 308 from the received value 100 to obtain 80 and transmits it to the first communication component 301. Finally, the current request received by the DC charging pile 100 is 80A, and the current of 80A is delivered to the vehicle battery 200. After the vehicle battery 200 receives the current of 80A, due to the large difference between the received current and the requested current, it will be considered that the DC charging pile 100 is in the current increase stage, and will not frequently output message requests to adjust the current, so that the DC charging pile on-site calibration auxiliary device provided in the present application does not need to work frequently, and has an energy-saving effect.

[0088] The DC charging pile on-site calibration auxiliary device provided in the present application realizes further processing of the requested current by setting a register and a subtractor, connecting the two input ends of the subtractor to the output ends of the latch and the register respectively, and connecting the output end of the subtractor to the second input end of the first communication component, thereby ensuring that there is a certain difference between the current output by the DC charging pile and the current requested by the vehicle battery, ensuring that the vehicle battery will not exceed the output regulation current request, saving energy consumption, and at the same time, reducing the probability that the current output by the DC charging pile is greater than the secondary current of the vehicle battery, further improving the safety of the calibration process.

[0089] Figure 6 It is a structural schematic diagram of a DC charging pile on-site calibration auxiliary device provided by an embodiment of the present application. On the basis of the above embodiments, further, the DC charging pile on-site calibration auxiliary device provided by the present application also includes: a switch 310, which is arranged between the second input port 301a2 of the first communication component 301 and the first output port 302b1 of the second communication component 302, and is connected in parallel with the latch 303.

[0090] Specifically, when the switch 310 is opened, current passes through the path where the latch 303 is located, and when the switch 310 is closed, the path where the latch 303 is located is short-circuited, and current passes through the path where the switch 310 is located.

[0091] The DC charging pile on-site calibration auxiliary device provided in the present application is provided with a switch connected in parallel with a latch. By controlling the opening and closing of the switch 310, the DC charging pile can be freely switched between the stable output mode and the normal charging mode, thereby making the collected data more complete.

[0092] Figure 7It is a structural schematic diagram of a DC charging pile on-site calibration auxiliary device provided by an embodiment of the present application. On the basis of the above embodiments, further, the DC charging pile on-site calibration auxiliary device provided by the present application also includes: a first memory 311 and a second memory 312; the first memory 311 is connected to the second output port 301b2 of the first communication component 301; the second memory 312 is connected to the first output port 302b1 of the second communication component 302.

[0093] Specifically, the message output by the DC charging pile 100 includes the magnitude of the output current, and the first communication component 301 parses the message and outputs it and stores it in the first memory 311. The message output by the vehicle battery 200 includes not only the current request data but also the actual magnitude of the received current. After parsing the message, the second communication component 302 outputs the current request data to the latch and also transmits the actual current magnitude to the second memory 312 for storage.

[0094] The DC charging pile on-site calibration auxiliary device provided in the present application realizes further collection and storage of calibration data by setting up a first memory 311 and a second memory 312, so as to perform subsequent further processing and analysis on the collected data.

[0095] In another embodiment, the first communication component 301 and the second communication component 302 may also be connected to a data terminal for communication so as to directly upload the data in the message to the data terminal, wherein the data terminal may be a mobile phone, a PC, a central server, etc., and this application does not limit this.

[0096] Figure 8 It is a structural schematic diagram of a DC charging pile on-site calibration auxiliary device provided in an embodiment of the present application. On the basis of the above embodiments, the DC charging pile on-site calibration auxiliary device provided in the present application further includes: a metering component 313, which is arranged between the second output port 301b2 of the first communication component 301 and the first input port 302a1 of the second communication component 302.

[0097] Specifically, the metering component 313 may be an existing electric energy metering chip, such as HLW8012, ADE7953, etc., but the present application is not limited thereto.

[0098] By setting up the measurement components, the collected data can be made more complete, thereby making the subsequent verification results more accurate.

[0099] In some embodiments, the DC charging pile on-site verification auxiliary device provided by the present application further includes: a server, which is in communication connection with the first communication component and the second communication component. The input data of the DC charging pile verification network includes: cell state data at the last moment, hidden state data at the last moment, current value data at the current moment, and the output current change rate of the charging pile at the current moment.

[0100] Fig. 9 1 is a schematic diagram of a DC charging pile calibration network provided in an embodiment of the present application, which is used to determine whether a DC charging pile is faulty based on calibration data. Fig. 9 As shown, the DC charging pile verification network provided in the present application includes: a forget gate 901 , an input gate 902 , a cell state unit 903 and an output gate 904 .

[0101] Specifically, the DC charging pile verification network provided in this application is an improvement based on the LSTM network. Different from the traditional LSTM network, this application adds the charging pile output current change rate K on the basis of the traditional LSTM network. t As the input variable, a DNN module is added in the input gate 902. The DNN module is [h t-1 , X t , K t ] as the input variable, and use sigmoid as the activation function in the output layer to output the updated weight i at time t t Among them, h t-1 is the hidden state data output by the network at time t-1; X t is the updated data of the network at time t, including the output current value I of the DC charging pile 100 at time t 100t and the requested current value I of the vehicle battery 200 200t ; K t is the rate of change of the output current of the charging pile at time t, which can be calculated by the following formula:

[0102]

[0103] Among them, I 100t-1 is the current value output by the DC charging pile 100 at time t-1, and Δt is the time interval between time t and time t-1.

[0104] Since the output current value of the DC charging pile often contains more state information when it changes rapidly, the output current change rate K of the charging pile is introduced. t As a new input variable, it is combined with the hidden state data at the previous moment and the input data at time t to determine the update weight i at time t t, can update more accurate cell status and thus obtain more accurate test results.

[0105] Normal DC charging pile verification data and faulty DC charging pile verification data can be collected in advance and divided into training sets and prediction sets, and the DC charging pile verification network used in this application is obtained by training with the gradient descent method. The number of layers of the DNN module in the DC charging pile verification network can be set according to actual conditions, such as 3 layers, 5 layers, etc., and this application does not limit this.

[0106] The present application also provides a DC charging pile on-site calibration auxiliary method, which is implemented based on the DC charging pile on-site calibration auxiliary device provided in the above embodiments, with the server of the DC charging pile on-site calibration auxiliary device as the execution body.

[0107] Fig.10 is a flow chart of a DC charging pile on-site verification auxiliary method provided by some embodiments of the present application, such as Fig.10 As shown, the DC charging pile on-site verification auxiliary method provided by this application includes:

[0108] S1001: Obtain the output current value of the DC charging pile at the previous moment, the output current value at the current moment, and the interval between two output currents from the first communication component, obtain the requested current value of the vehicle battery at the current moment from the second communication component, and determine the output current change rate of the charging pile at the current moment according to the output current value at the previous moment, the output current value at the current moment, and the interval between two output currents;

[0109] Specifically, the output current value of the DC charging pile at the last moment can be expressed by I 100t-1 Indicates that the output current value at the current moment can be obtained by I 100t Indicates that the output current change rate K at the current moment t It can be calculated by formula (1).

[0110] S1002: Inputting the output current value at the previous moment, the output current value at the current moment, and the previously acquired hidden state data at the previous moment into a forget gate to obtain the memory weight at the current moment;

[0111] Specifically, the vector composed of the output current value at the previous moment and the output current value at the current moment is recorded as X t , expressed in the form of a vector; the memory weight f at the current moment t It can be calculated by the following formula:

[0112] f t =σ(W f ·[h t-1 ,X t ]+b f ) (2)

[0113] Among them, σ represents the sigmoid function; h t-1 Hide the status data of the previous moment; X t is the vector composed of the output current value at the previous moment and the output current value at the current moment; W f is the forget gate weight, b f is the forget gate bias, W f and b f It can be obtained through model training.

[0114] S1003: Input the output current value at the previous moment, the output current value at the current moment, the output current change rate of the charging pile at the current moment, and the previously acquired hidden state data at the previous moment into the input gate to obtain the updated data at the current moment;

[0115] Specifically, the output current value at the previous moment, the output current value at the current moment, the output current change rate of the charging pile at the current moment, and the pre-acquired hidden state data at the previous moment are input into the DNN network in the input gate to obtain the update weight; and the pre-update data is determined based on the output current value at the previous moment, the output current value at the current moment, and the pre-acquired hidden state data at the previous moment; then, the update data is determined based on the update weight and the pre-update data. The update data can be calculated by the following formula:

[0116]

[0117] Among them, C yt Indicates the updated data at the current moment; i t represents the update weight; Indicates pre-update data. The pre-update data can be calculated using the following formula:

[0118]

[0119] in, Indicates the pre-update data at the current moment; h t-1 is the hidden state data of the previous moment. In the initial state, h t-1 It can be set according to the actual situation, such as a zero vector, a random vector, etc., and this application does not limit this; X t To update the data, including the output current value at the previous moment and the output current value at the current moment; W c represents the pre-update weight, b j represents the pre-update bias, W c and b j It can be obtained through model pre-training.

[0120] S1004: inputting the memory weight, the updated data at the current moment and the previously acquired cell state data at the previous moment into the cell state unit to determine the cell state data at the current moment;

[0121] Specifically, the cell state data can be calculated according to the following formula:

[0122] C t =f t ·C t-1 +C yt (5)

[0123] Among them, C t is the cell state data at the current moment, C t-1 is the cell state data of the previous moment. In the initial state, C t-1 It can be set according to the actual situation, such as a zero vector, a random vector, etc., and this application does not limit this; f t is the memory weight at the current moment, which can be calculated by formula (2); C yt is the updated data at the current moment, which can be calculated according to formula (3).

[0124] S1005: The output current value at the previous moment, the output current value at the current moment, the hidden state data at the previous moment and the cell state data are input into the output gate to determine the hidden state data at the current moment;

[0125] Specifically, in the output gate, the conversion parameter at the current moment is first determined based on the output current value at the previous moment, the output current value at the current moment, and the hidden state data at the previous moment, and then the hidden state data at the current moment is determined based on the conversion parameter at the current moment and the cell state data at the current moment. The hidden state data at the current moment can be calculated by the following formula:

[0126] h t =o t tanh(C t ) (6)

[0127] Among them, h t Represents the hidden state data at the current moment, o t Indicates the conversion parameter at the current moment, C t Represents the cell state data at the current moment. The conversion parameter o at the current moment t It can be calculated according to the following formula:

[0128] o t =σ(W o ·[h t-1 ,X t ]+b o ) (7)

[0129] Among them, σ represents the sigmoid function; h t-1 Hide the status data of the previous moment; X t is the vector composed of the output current value at the previous moment and the output current value at the current moment; W o is the input gate weight, b o is the input gate bias, W o and b o It can be obtained through model training.

[0130] S1006: Determine whether the DC charging pile is faulty based on the hidden status data.

[0131] Specifically, the hidden state data is a data vector, which can be input into a subsequent neural network for further processing to obtain a judgment result on whether the DC charging pile is faulty. The subsequent neural network can be, for example, a deep neural network or a convolutional neural network, etc., which is not limited in this application.

[0132] The DC charging pile on-site calibration auxiliary method provided by the present application determines the output current change rate of the charging pile at the current moment according to the output current value at the previous moment, the output current value at the current moment and the interval time between two output currents; inputs the output current value at the previous moment, the output current value at the current moment and the pre-acquired hidden state data at the previous moment into a forget gate to obtain the memory weight at the current moment; inputs the output current value at the previous moment, the output current value at the current moment, the output current change rate of the charging pile at the current moment and the pre-acquired hidden state data at the previous moment into an input gate to obtain the updated data at the current moment; inputs the memory weight, the updated data at the current moment and the pre-acquired cell state data at the previous moment into a cell state unit to determine the cell state data at the current moment; and then inputs the output gate to determine the hidden state data at the current moment, and further determines whether the DC charging pile has a fault, thereby realizing the rational use of the calibration data and improving the accuracy of the charging pile fault judgment.

[0133] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0134] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0135] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0136] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0137] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0138] The descriptions with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. The order of steps involved in each embodiment is used to schematically illustrate the implementation of the present application, and the order of steps therein is not limited and may be appropriately adjusted as needed.

[0139] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0140] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A DC charging pile on-site verification auxiliary device, characterized in that: include: A first communication component, a second communication component, and a latch for latching a requested current of a vehicle battery; The first input port and the first output port of the first communication component are connected to the DC charging pile to be tested, the second output port is connected to the first input port of the second communication component, and the second input port is connected to the output end of the latch; The first output port of the second communication component is connected to the data input terminal of the latch, and the second output port and the second input port are connected to the vehicle battery.

2. The DC charging pile on-site verification auxiliary device according to claim 1, characterized in that: Also includes: A single-pole double-throw switch has a first end connected to the enable end of the latch and a second end switched between a high level and a ground end.

3. The DC charging pile on-site verification auxiliary device according to claim 2, characterized in that: Also includes: Comparator; The output terminal of the latch is also connected to the first input terminal of the comparator; The first output port of the second communication component is also connected to the second input terminal of the comparator; The second end of the single-pole double-throw switch is switched to be connected between a high level and an output end of the comparator.

4. The DC charging pile on-site verification auxiliary device according to claim 3, characterized in that: The comparator is a numerical comparator, and the output terminal of the numerical comparator connected to the latch outputs a high level when input data of a first input terminal of the numerical comparator is greater than input data of a second input terminal.

5. The DC charging pile on-site verification auxiliary device according to claim 3, characterized in that: The comparator is an analog comparator, and further comprises: a first digital-to-analog conversion circuit and a second digital-to-analog conversion circuit; The first digital-to-analog conversion circuit is arranged between the output terminal of the latch and the first input terminal of the comparator; The second digital-to-analog conversion circuit is arranged between the first output port of the second communication component and the second input terminal of the comparator; The first input terminal of the comparator is a positive input terminal, and the second input terminal of the comparator is a negative input terminal.

6. The DC charging pile on-site verification auxiliary device according to claim 1, characterized in that: Also includes: registers and subtractors; The first input terminal of the subtractor is connected to the output terminal of the latch, and the second input terminal is connected to the register; The output end of the subtractor is connected to the second input port of the first communication component.

7. The DC charging pile on-site verification auxiliary device according to claim 1, characterized in that: Also includes: A switch is provided between the second input port of the first communication component and the first output port of the second communication component and is connected in parallel with the latch.

8. The DC charging pile on-site verification auxiliary device according to claim 1, characterized in that: Also includes: a first memory and a second memory; The first memory is connected to the second output port of the first communication component; The second memory is connected to the first output port of the second communication component.

9. The DC charging pile on-site verification auxiliary device according to claim 1, characterized in that: Also includes: A server, connected to the first communication component and the second communication component for communication; The server is provided with a DC charging pile verification network, and the DC charging pile verification network includes: a forget gate, an input gate, a cell state unit and an output gate, and a deep neural network is provided in the input gate; The input data of the DC charging pile verification network includes: cell state data at the last moment, hidden state data at the last moment, current value data at the current moment, and the charging pile output current change rate at the current moment.

10. A DC charging pile on-site verification auxiliary method, implemented by a server based on the DC charging pile on-site verification auxiliary device according to claim 9, characterized in that: include: Obtaining the output current value of the DC charging pile at the last moment, the output current value at the current moment, and the interval between two output currents from the first communication component, obtaining the requested current value of the vehicle battery at the current moment from the second communication component, and determining the output current change rate of the charging pile at the current moment according to the output current value at the last moment, the output current value at the current moment, and the interval between two output currents; Input the output current value at the previous moment, the output current value at the current moment, and the pre-acquired hidden state data at the previous moment into the forget gate to obtain the memory weight at the current moment; Input the output current value at the previous moment, the output current value at the current moment, the output current change rate of the charging pile at the current moment, and the previously acquired hidden state data at the previous moment into the input gate to obtain the updated data at the current moment; Inputting the memory weight, the updated data at the current moment and the pre-acquired cell state data at the previous moment into the cell state unit to determine the cell state data at the current moment; Input the output current value at the previous moment, the output current value at the current moment, the hidden state data at the previous moment and the cell state data into the output gate to determine the hidden state data at the current moment; Determine whether the DC charging pile has a fault according to the hidden status data.

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