Direct current charging test system and method

Abstract

The invention provides a direct current charging test system and method, and the system comprises a test switching wire harness and controller area network development environment CANoe hardware, and the test switching wire harness comprises a charging communication wire harness; the charging communication wire harness is configured to be used for communicating the charging communication electrode of the charging pile with the charging communication electrode of the vehicle through CANoe hardware; the CANoe hardware is configured to be used for receiving a specified message which is sent from one of the charging pile and the vehicle and is related to the direct current charging test through the charging communication wire harness; modifying the specified message based on a message modification instruction sent by the upper computer; and sending the modified specified message to the other one of the charging pile and the vehicle through the charging communication wire harness so as to carry out a direct current charging test. Thus, the system can simulate various different charging working conditions, the purpose that direct current charging testing can be carried out without replacing the charging pile or carrying out complex arrangement on the vehicle is achieved, and the testing flexibility is improved.

Description

Technical Field

[0001] This application relates to the field of charging test technology, and in particular to a DC charging test system and method. Background Technology

[0002] Currently, there are DC charging test systems such as Figure 1 As shown, this testing system includes key equipment such as a circuit simulator, a CAN data acquisition unit, and a waveform recorder, forming a relatively complete testing architecture. With this architecture, several important functions can be achieved during vehicle charging: firstly, it can accurately collect and replay national standard charging message data, ensuring the accuracy and completeness of information exchange during charging; secondly, it can monitor charging voltage and charging current in real time, providing strong assurance for the safety and stability of the charging process.

[0003] However, the current testing system has significant limitations in practical applications. It can only rely on Controller Area Network (CAN) message data and real-time acquisition of charging voltage and charging current by a waveform recorder to verify whether the DC charging status of the charging pile and vehicle meets national standards. It is difficult to simulate various complex and changing charging conditions, and therefore cannot directly perform certain special DC charging tests, such as vehicle boost charging strategy verification tests or charging pile characteristic tests. Summary of the Invention

[0004] To address the aforementioned problems, this application provides a DC charging test system and method.

[0005] In a first aspect, a DC charging test system is provided, comprising: a test adapter harness and a CANoe hardware controller local area network development environment, wherein the test adapter harness includes a charging communication harness; the charging communication harness is configured to connect the charging communication terminal of a charging pile to the charging communication terminal of a vehicle via the CANoe hardware; the CANoe hardware is configured to receive a specified message related to DC charging testing sent from one of the charging pile and the vehicle via the charging communication harness; modify the specified message based on a message modification instruction sent by a host computer; and send the modified specified message to the other of the charging pile and the vehicle via the charging communication harness to perform DC charging testing.

[0006] Secondly, a DC charging test method is provided, comprising: using a charging communication harness to connect the charging communication terminal of a charging pile to the charging communication terminal of a vehicle via the CANoe hardware; using the CANoe hardware to receive a specified message related to DC charging test sent from one of the charging pile and the vehicle via the charging communication harness; modifying the specified message based on a message modification instruction sent by a host computer; and sending the modified specified message to the other of the charging pile and the vehicle via the charging communication harness to perform DC charging test.

[0007] In summary, the DC charging test system and method provided in this application have the following advantages: Compared to traditional DC charging tests, where the communication message parameters between the charging pile and the vehicle are fixed and difficult to adjust flexibly according to different test requirements, the CANoe hardware in this DC charging test system can receive specified messages related to DC charging testing from either the charging pile or the vehicle via the charging communication harness. Based on message modification instructions sent by the host computer, the system modifies the specified messages and sends the modified messages to the other of the charging pile and the vehicle via the charging communication harness. This simulates various charging conditions, achieving the goal of performing various DC charging tests without changing the charging pile or making complex vehicle settings, thus improving the flexibility of the test. Furthermore, the CANoe hardware can accurately modify the specified messages according to the instructions, thereby achieving precise control of the charging test parameters.

[0008] Furthermore, this DC testing system is not dependent on specific brands or models of charging stations and vehicles. As long as the charging station and vehicle follow the same communication protocol, they can be connected and tested via the test adapter harness and CANoe hardware. This excellent compatibility and versatility allows the system to be widely used for testing electric vehicles and charging stations from different manufacturers. Attached Figure Description

[0009] To more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 A schematic diagram of the structure of a DC charging test system provided by the prior art is shown; Figure 2 This invention provides a schematic diagram of the system structure of a DC charging test system according to an embodiment of the present application. Figure 3This illustration shows a connection diagram of a vehicle, a charging communication harness, and a charging pile according to an embodiment of this application. Figure 4 This invention provides a schematic diagram of the specific structure of a DC testing system according to an embodiment of the present application. Figure 5 This illustration shows a functional structure diagram of the visual control panel of a host computer provided in an embodiment of this application; Figure 6 This diagram illustrates a flowchart of a DC charging test method provided in an embodiment of this application. Detailed Implementation

[0011] To make the above and other features and advantages of this application clearer, the application is further described below with reference to the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explanation to those skilled in the art, and are exemplary only, not restrictive.

[0012] In the following description, numerous specific details are set forth to provide a thorough understanding of this application. However, it will be apparent to those skilled in the art that the specific details are not required to practice this application. In other instances, well-known steps or operations have not been described in detail to avoid obscuring this application.

[0013] Currently, in the scenario of DC charging of electric vehicles on an 800V voltage platform, during the charging handshake stage, the electric vehicle needs to accurately sample the insulation voltage output by the charging pile. By analyzing the sampled data, the highest output voltage specification of the charging pile (such as 500V, 750V or 1000V) is determined, and then a decision is made on whether to perform boost charging operation based on this determination result.

[0014] While most charging stations have the capability to switch between maximum output voltage specifications through specific methods, such as accessing manufacturer mode using a key or rewriting the charging station software, these methods have significant drawbacks. Firstly, manufacturers typically strictly control access to these operations and do not grant them public access, meaning ordinary users or third-party testing organizations cannot easily switch voltage specifications themselves. Secondly, even if technical support is available, it usually requires payment, which undoubtedly increases testing costs and difficulty.

[0015] For the reasons mentioned above, switching between high-output voltage specifications for charging piles is fraught with difficulties, leading to several adverse effects. First, it's difficult to conduct comprehensive characteristic surveys and tests on charging piles from different brands. Different brands may have differences in output characteristics and communication protocols, and the inability to freely switch voltage specifications makes it difficult to gain a thorough understanding of their specific performance. Second, it's difficult to effectively verify the charging compatibility of electric vehicles on an 800V voltage platform.

[0016] Furthermore, some commercially available charging stations, for safety reasons, have implemented a protection mechanism that actively stops charging when the vehicle's State of Charge (SOC) reaches ≥95% to prevent overcharging of the electric vehicle's battery system. Due to the technical limitation of difficulty in switching charging station voltage specifications, it is impossible to flexibly adjust the charging station's output voltage according to ideal conditions during full-charge testing of the boost charging strategy. This makes it difficult to simulate real-world full-charge scenarios, and consequently, it is impossible to comprehensively and accurately verify the performance and safety of the boost charging strategy under full-charge conditions. This undoubtedly poses a significant challenge to the research and optimization of charging technology for 800V platform electric vehicles.

[0017] Based on this, this application proposes a DC charging test system. When a vehicle is connected to a charging station, the system accurately forwards the charging messages transmitted between them to the CAN open environment (CANoe) hardware via a test adapter harness. The CANoe hardware can flexibly modify the data in the received charging messages according to message modification instructions corresponding to preset test requirements. Thus, by modifying these parameters, precise adjustment of charging parameters can be achieved.

[0018] Based on the flexible adjustment of charging parameters, this testing system can simulate a wide variety of charging conditions. Compared with traditional DC charging testing methods, the DC charging testing system proposed in this application has significant advantages. On the one hand, it meets the various complex requirements of DC charging testing. On the other hand, it effectively improves testing efficiency. Traditional testing methods require setting up multiple different test environments or using various test equipment to simulate different operating conditions, which is cumbersome and time-consuming. However, this system modifies the charging message through CANoe hardware to adjust the output parameters of the vehicle or charging pile, eliminating the need for frequent changes in test environments or equipment. It can quickly complete the simulation test of multiple operating conditions, greatly shortening the testing cycle and reducing testing costs.

[0019] One embodiment of this application provides a DC charging test system. Figure 2 This application provides a schematic diagram of the system structure of a DC charging test system according to an embodiment of the present application. Figure 2 As shown, the DC charging test system 20 may include a test adapter harness 21 and a CAN open environment (CANoe) hardware 22.

[0020] The test adapter harness 21 can be connected to the charging pile and the vehicle, and is configured to connect the DC charging interface of the vehicle to the DC charging interface of the charging pile to realize the charging transmission between the vehicle and the charging pile during the charging test.

[0021] Furthermore, the test adapter harness 21 is also connected to the CANoe hardware 22 and is configured to forward charging messages transmitted between the charging station and the vehicle to the CANoe hardware 22.

[0022] One embodiment of this application relates to a vehicle including an electric vehicle or a hybrid vehicle.

[0023] The DC charging interface of the vehicle and the DC charging interface of the charging pile involved in one embodiment of this application can be set according to GB / T20234.3-2023 "Connecting devices for conductive charging of vehicles - Part 3: DC charging interface".

[0024] In one embodiment of this application, the DC charging interface may include, but is not limited to, the following interfaces: charging connection confirmation CC1 and CC2, protective ground interface PE, low-voltage auxiliary power supply positive A+, low-voltage auxiliary power supply negative A-, DC power supply positive DC+, DC power supply negative DC-, charging communication high-level terminal S+, and charging communication low-level terminal S-.

[0025] CC1 is the charging pile connection confirmation interface, used to check if the charging gun is correctly inserted into the charging port. CC2 is the vehicle connection confirmation interface, used to check if the charging gun is correctly inserted into the vehicle's charging port. A+ and A- are used to provide low-voltage power. DC+ and DC- are used to provide charging current. S+ and S- are used to transmit messages between the charging pile and the vehicle.

[0026] In one embodiment of this application, the test adapter harness 21 may include, but is not limited to, a charging communication harness, a charging connection confirmation harness, a protective grounding harness, a DC power supply harness, and a low-voltage auxiliary power supply harness.

[0027] The charging communication harness is configured to connect the charging communication terminal of the charging pile to the charging communication terminal of the vehicle via CANoe hardware 22.

[0028] Specifically, the charging communication terminals include a high-level charging communication terminal and a low-level charging communication terminal. The charging communication wiring harness includes a first charging communication wiring harness and a second charging communication wiring harness. The high-level and low-level charging communication terminals of the charging pile are connected to the CAN1 interface of the CANoe hardware 22 through the first charging communication wiring harness. The high-level and low-level charging communication terminals of the vehicle are connected to the CAN2 interface of the CANoe hardware 22 through the second charging communication wiring harness.

[0029] In one embodiment of this application, the charging messages transmitted between the charging pile and the vehicle adopt a hybrid transmission method, that is, periodic transmission is only performed after a trigger condition is met. The charging process between the charging pile and the vehicle can be roughly divided into a charging handshake stage, a charging parameter configuration stage, a charging stage, and a charging end stage. Each stage corresponds to a specific charging message.

[0030] For example, specific messages corresponding to the charging handshake phase include, but are not limited to, the Charger Handshake Message (CHM), the Battery Management System Handshake Message (BHM), the Charger Recognition Message (CRM), and the Vehicle Recognition Message (BRM). Specific messages corresponding to charging parameter configuration may include, but are not limited to, the Battery Charging Parameters (BCP), the Charger Time Synchronization (CTS), the Charger Maximum Output Level (CML), the Battery Ready OK (BRO), and the Charger Ready OK (CRO).

[0031] The specific messages corresponding to the charging stage may include the Battery Charging Status (BCS), Battery Charging Lab (BCL), Charger Charging Status (CCS), Battery Status Message (BSM), Battery Cell Main Voltage (BMV), Battery Main Limit (BML), Battery Status Persist (BSP), Battery Stop (BST), and Charger Stop (CST).

[0032] The specific messages corresponding to the end of the charging phase may include, but are not limited to, BMS statistical data messages (BatteryStatistical Data, BSD) and charging pile statistical data messages (Charger Statistical Data, CSD).

[0033] In some embodiments of this application, the CANoe hardware 22 is configured to receive a designated message related to DC charging testing sent from one of the charging pile and the vehicle via a charging communication harness; modify the designated message based on a message modification instruction sent by a host computer; and send the modified designated message to the other of the charging pile and the vehicle via the charging communication harness for DC charging testing.

[0034] The designated message involved in this application can be at least one of the aforementioned charging messages. DC charging tests may include, but are not limited to, tests related to boost charging strategy verification, dynamic response characteristic tests of charging pile current output capability, and charging pile start-stop characteristic tests.

[0035] In one embodiment of this application, the CANoe hardware 22 is configured to directly forward messages other than the specified message.

[0036] It should be noted that the CANoe hardware 22 only modifies the specified message and does not modify other messages.

[0037] Furthermore, the CANoe hardware supports multiple common CAN communication protocols, enabling it to adapt to the communication requirements of different charging standards. Whether it's the new national standard charging protocol in China or international charging protocols such as CHAdeMO and CCS, this DC charging system can be tested through corresponding configurations and settings, further improving the versatility and applicability of the testing system.

[0038] Figure 3 This application provides a schematic diagram illustrating the connection of a vehicle, a charging communication harness, and a charging pile according to an embodiment of the present application. Figure 3 As shown, the charging communication high-level electrode S+ and the charging communication low-level electrode S- of the charging pile are connected to the CAN1 interface of the CANoe hardware 22 through the first charging communication harness. The charging communication high-level electrode S+ and the charging communication low-level electrode S- of the vehicle are connected to the CAN2 interface of the CANoe hardware 22 through the second charging communication harness.

[0039] like Figure 3As shown, during DC charging testing, the CANoe hardware 22 can receive charging messages sent by the charging pile through the CAN1 interface, modify specific messages within the charging messages, and then send the modified specified messages, along with other messages, to the vehicle through the CAN2 interface. Similarly, the CANoe hardware 22 can receive charging messages sent by the vehicle through the CAN2 interface, modify specific messages within the charging messages, and then send the modified specified messages, along with other messages, to the charging pile through the CAN1 interface. Thus, the CANoe hardware 22 possesses gateway functionality, enabling it to modify and forward charging messages.

[0040] In some embodiments of this application, since the BHM during the charging handshake phase is a test-related message associated with boost charging strategy verification, when the DC charging test includes tests related to boost charging strategy verification, the message modification instruction includes a BHM modification instruction, specifying that the message includes the BHM.

[0041] The CANoe hardware 22 is configured to receive the BHM sent by the vehicle via the charging communication harness during the charging handshake phase; modify the BHM based on the BHM modification command sent by the host computer, and send the modified BHM to the charging pile via the charging communication harness, so that the insulation voltage output by the charging pile is adjusted to the voltage value corresponding to the BHM modification command, in order to perform tests related to the verification of the boost charging strategy.

[0042] One embodiment of this application relates to a BHM that can affect the insulation voltage output by the charging pile. Thus, by modifying the BHM, the insulation voltage output by the charging pile can be changed, thereby enabling related tests for verifying the boost charging strategy.

[0043] During charging tests, testers determine the charging pile's voltage specification based on its insulation voltage value. For example, if the vehicle's maximum permissible charging voltage is >750V, a charging pile with a measured insulation voltage of 500V is considered to have a 500V voltage specification; one with 750V is considered to have a 750V voltage specification; and one with the measured insulation voltage equal to the vehicle's maximum permissible charging voltage is considered to have a 1000V voltage specification. Therefore, by adjusting the insulation voltage output of the charging pile, a single charging pile can be simulated as different specifications, facilitating the verification of boost charging strategies using a single charging pile.

[0044] Thus, during the charging handshake phase, the BHM (Balance Height Management) sent by the vehicle to the charging station is modified via CANoe hardware. This allows the charging station to adjust its output insulation voltage according to the modified BHM, enabling the insulation voltage output specification to be set to support the verification testing of the 800V voltage platform boost charging strategy. This eliminates the need for technical support from the charging station manufacturer, avoids additional testing costs, and eliminates the need to use multiple charging stations with the highest voltage specifications during boost charging strategy verification testing.

[0045] In one embodiment of this application, the identifier (ID) of the BHM is 0x182756F4h, and its data content includes the vehicle's maximum permissible charging voltage. The parameter value of the vehicle's maximum permissible charging voltage can affect the insulation voltage output by the charging pile.

[0046] For example, the maximum allowable charging voltage of the vehicle is set to A, the maximum output voltage of the charging pile is set to B, and the insulation voltage output by the charging pile is the minimum value between A and B.

[0047] In one embodiment of this application, modifying the BHM based on a BHM modification command sent by a host computer includes: modifying the parameter value in the BHM that indicates the maximum allowable charging voltage of the vehicle to the voltage value indicated by the BHM modification command.

[0048] For example, if the voltage value indicated by the BHM modification command is 750, the CANoe hardware will assign the parameter value indicating the vehicle's maximum permissible charging voltage in the BHM to 750; if the voltage value indicated by the BHM modification command is 500, the CANoe hardware will assign the parameter value indicating the vehicle's maximum permissible charging voltage in the BHM to 500; if the voltage value indicated by the BHM modification command is 300, the CANoe hardware will assign the parameter value indicating the vehicle's maximum permissible charging voltage in the BHM to 300; if the voltage value indicated by the BHM modification command is the current maximum permissible charging value for the vehicle, the CANoe hardware will assign the parameter value indicating the vehicle's maximum permissible charging voltage in the BHM to the current maximum permissible charging value for the vehicle.

[0049] In one embodiment of this application, the CANoe hardware receives the BHM from the vehicle from the charging communication harness, then assigns the parameter value in the BHM indicating the vehicle's maximum allowable charging voltage to the voltage value indicated by the BHM modification command, and sends the modified BHM to the charging pile through the charging communication harness. The charging pile compares its own maximum output voltage value B with the parameter value A of the vehicle's maximum allowable charging voltage. When A is less than B, the charging pile adjusts the output insulation voltage to A; when A is greater than B, the charging pile adjusts the output insulation voltage to B.

[0050] In some embodiments of this application, since the BCL during the charging phase is a message related to the dynamic response characteristic test of the charging pile's current output capability, when the DC charging test includes the dynamic response characteristic test of the charging pile's current output capability, the message modification instruction includes a BCL modification instruction, specifying that the message includes the BCL.

[0051] The CANoe hardware 22 is configured to receive the BCL sent by the vehicle via the charging communication harness during the charging phase; modify the BCL based on the BCL modification command sent by the host computer, and send the modified BCL to the charging pile via the charging communication harness, so that the output current of the charging pile is adjusted to the current value corresponding to the BCL modification command, so as to perform dynamic response characteristic test of the charging pile current output capability.

[0052] One embodiment of this application relates to a BCL that can affect the magnitude of the output current of a charging pile. Thus, by modifying the BCL, the magnitude of the output current of the charging pile can be changed, thereby enabling dynamic response characteristic testing of the charging pile's current output capability.

[0053] Thus, during the charging phase, the BCL (Block Flow Chart) sent by the vehicle to the charging station is modified via CANoe hardware. This allows the charging station to adjust its output current according to the modified BCL, enabling configurable output current and supporting dynamic response characteristic testing of various charging station current output capabilities. Furthermore, this dynamic response characteristic testing of charging station current output capabilities does not require technical support from charging station manufacturers, nor does it incur additional testing costs or the use of charging stations with multiple output current specifications.

[0054] In one embodiment of this application, the BCL ID is 0x181056F4h, and its data content includes the vehicle's charging request current. The parameter value of the vehicle's charging request current can affect the output current of the charging pile.

[0055] For example, if the parameter value of the vehicle's charging request current is set to C, the output current of the charging pile is also adjusted to C.

[0056] In one embodiment of this application, the BCL is modified based on the BCL modification instruction sent by the host computer, including: modifying the parameter value in the BCL that indicates the charging request current of the vehicle to the current value indicated by the BCL modification instruction.

[0057] For example, if the BCL modification instruction indicates a current value of 10, the CANoe hardware will assign the parameter value indicating the vehicle's charging request current in the BCL to 10; if the BCL modification instruction indicates a current value of 50, the CANoe hardware will assign the parameter value indicating the vehicle's charging request current in the BCL to 50; if the BCL modification instruction indicates a current value of 100, the CANoe hardware will assign the parameter value indicating the vehicle's charging request current in the BCL to 100; if the BCL modification instruction indicates a current value equal to the current vehicle's charging request current value, the CANoe hardware will assign the parameter value indicating the vehicle's charging request current in the BCL to the current vehicle's charging request current value.

[0058] In one embodiment of this application, the CANoe hardware receives the BCL from the vehicle via the charging communication harness, then assigns the parameter value indicating the charging request current of the vehicle in the BCL to the current value C indicated by the BCL modification command, and sends the modified BCL to the charging pile via the charging communication harness. The charging pile then adjusts the output current to C.

[0059] In some embodiments of this application, since the BSM during the charging phase is a message related to the charging pile start-stop characteristic test, when the DC charging test includes the charging pile start-stop characteristic test, the message modification instruction includes a BSM modification instruction, specifying that the message includes the BSM.

[0060] The CANoe hardware 22 is configured to receive the BSM sent by the vehicle via the charging communication harness during the charging phase; modify the BSM based on the BSM modification command sent by the host computer, and send the modified BSM to the charging pile via the charging communication harness, so that the charging pile controls the current output or controls the current to stop output according to the modified BSM, so as to perform charging pile start-stop characteristic test.

[0061] One embodiment of this application relates to a BSM that can affect the output current of a charging pile. By modifying the BSM, the current output state of the charging pile can be changed (such as maintaining current output, starting current output, or prohibiting current output), thereby enabling charging pile start-stop characteristic testing.

[0062] Thus, during the charging phase, the BSM (Battery Management System) sent by the vehicle to the charging station is modified via CANoe hardware. This allows the charging station to adjust its output current based on the modified BSM, enabling configurable current output and supporting start-stop characteristic testing for various charging stations. Furthermore, no technical support from the charging station manufacturer is required for charging station start-stop characteristic testing, and no additional testing costs are incurred.

[0063] In one embodiment of this application, the BSM's ID is 0x181356F4h, and its data includes whether charging is enabled or disabled. This enabled or disabled parameter value can affect the charging pile's current output status.

[0064] For example, when the charging enable / disable parameter value is set to 0, the charging station stops outputting current. When the charging enable or disable command parameter value is set to 1, the charging station maintains or begins outputting current.

[0065] In one embodiment of this application, modifying the BSM based on a BSM modification instruction sent by a host computer includes: modifying the parameter value in the BSM that indicates charging permission or prohibition according to the BSM modification instruction.

[0066] In one embodiment of this application, the parameter value in the BSM indicating whether charging is enabled or disabled may include two different values, such as 0 and 1. Here, 0 indicates disabled, and 1 indicates enabled.

[0067] For example, if the BSM modification instruction indicates that the parameter value is 0, the CANoe hardware will assign the parameter value indicating charging enable or disable in the BSM to 0; if the BSM modification instruction indicates that the parameter value is 1, the CANoe hardware will assign the parameter value indicating charging enable or disable in the BSM to 1.

[0068] In one embodiment of this application, the CANoe hardware receives the BSM from the vehicle from the charging communication harness, then assigns the parameter value in the BSM indicating whether charging is allowed or prohibited to the parameter value indicated by the BSM modification command, and sends the modified BSM to the charging pile through the charging communication harness. The charging pile will output current or prohibit current according to E.

[0069] In some embodiments of this application, since the BCS during the charging phase is a message related to the full-charge test of the vehicle's boost charging strategy, when the DC charging test includes a full-charge test of the vehicle's boost charging strategy, the message modification instruction includes a BCS modification instruction, specifying the message as BCS.

[0070] The CANoe hardware 22 is configured to receive the BCS sent by the vehicle via the charging communication harness during the charging phase; modify the BCS based on the BCS modification command sent by the host computer, and send the modified BCS to the charging pile via the charging communication harness so that the charging pile continues to charge when the vehicle's SOC reaches a preset threshold, in order to perform a full charge test of the vehicle's boost charging strategy.

[0071] One embodiment of this application relates to a BCS that can affect whether the charging pile releases the vehicle's SOC charging limit. By modifying the BCS, it is possible to control whether the charging pile continues charging when the vehicle's SOC reaches a preset threshold, thereby enabling full-charge testing of the vehicle's boost charging strategy.

[0072] In one embodiment of this application, the preset threshold can be 95%.

[0073] In some of the above embodiments, during the charging phase, the BCS sent by the vehicle to the charging station is modified via CANoe hardware. This allows the charging station to determine whether to continue charging when the vehicle's SOC reaches 95%, thereby enabling the configurability of the SOC-limited charging state to support full-charge testing of the vehicle's boost charging strategy. Furthermore, full-charge testing of the vehicle's boost charging strategy does not require technical support from the charging station manufacturer, nor does it incur additional testing costs.

[0074] In one embodiment of this application, modifying the BCS based on a BCS modification instruction sent by a host computer includes: modifying the parameter value in the BCS that indicates the SOC charging limit according to the BCS modification instruction.

[0075] In one embodiment of this application, the parameter value indicating the SOC charging limit in the BCS may include two different values, such as 0 and 1. Here, 0 indicates a limit, and 1 indicates no limit.

[0076] For example, if the BCS modification instruction indicates that the parameter value is 0, the CANoe hardware will assign the parameter value of the SOC charging limit instruction in the BCS to 0; if the BCS modification instruction indicates that the parameter value is 1, the CANoe hardware will assign the parameter value of the SOC charging limit instruction in the BCS to 1.

[0077] In one embodiment of this application, the CANoe hardware receives the BCS from the vehicle via the charging communication harness, then assigns the parameter value of the SOC charging limit instruction in the BCS to the parameter value D indicated by the BCS modification instruction, and sends the modified BCS to the charging pile via the charging communication harness. The charging pile will determine whether to release the SOC charging limit based on D, that is, whether to continue outputting current when the SOC reaches a preset threshold.

[0078] In some embodiments of this application, the CANoe hardware 22 is also configured to collect message data during the DC charging test process and send it to the host computer so that the host computer can obtain the DC charging test results.

[0079] In some embodiments of this application, Figure 4 This application provides a schematic diagram of the specific structure of a DC testing system according to an embodiment of the present application. Figure 4 As shown, the DC charging test system includes a test adapter harness 21, CANoe hardware 22, and a waveform recorder 23.

[0080] The test adapter harness 21 also includes a DC communication harness. The DC communication harness is configured to connect the charging pile to the vehicle's DC high voltage positive terminal DC+, and to connect the charging pile to the vehicle's DC high voltage negative terminal DC-.

[0081] The waveform recorder 23 is connected to the DC communication harness and is configured to acquire current and voltage signals on the DC communication harness during DC charging tests.

[0082] In the above embodiments, by acquiring current and voltage signals during the DC charging test using a waveform recorder, the occurrence of abnormal signals can be monitored in real time, the source of the fault can be quickly located, and the reliability and efficiency of the DC charging test can be improved.

[0083] In addition, the current and voltage signals collected by the waveform recorder can be sent to the host computer so that the host computer can analyze the DC charging test process in conjunction with the message data and obtain the test results.

[0084] In some embodiments of this application, such as Figure 4 As shown, the DC charging test system may also include a host computer 24. This host computer is equipped with CANoe software and can communicate with the CANoe hardware.

[0085] The host computer 24 is configured to generate message modification instructions based on configuration information and / or test cases.

[0086] The configuration information involved in this application can be obtained by the user manually entering it on the visual control panel of the host computer. Users can flexibly set various parameters according to actual testing needs. After receiving the configuration information input by the user, the host computer will convert it into corresponding message modification instructions based on its built-in algorithms and logic rules.

[0087] Figure 5 This illustration shows a functional structure diagram of a visual control panel for a host computer provided in an embodiment of this application, as follows: Figure 5 As shown, the host computer's visual control panel 50 may include a charging parameter setting interface 51 and a charging parameter display interface 52. The charging parameter setting interface 51 may include settings such as charging pile specification settings 511, charging request current settings 512, SOC limit release settings 513, and charging permission settings 514. The charging parameter display interface 52 may include vehicle charging request parameters 521, charging pile output parameters 522, reasons for vehicle charging stoppage 523, and reasons for charging pile stoppage 524.

[0088] In one embodiment of this application, the charging pile specification setting 511 is a BHM modification setting for the charging handshake stage. The charging pile specification setting 511 defines the charging pile charging mode 0~3, and the corresponding "vehicle's maximum allowable charging voltage A = current vehicle's maximum allowable charging voltage / 300 / 500 / 750".

[0089] For example, before entering the charging handshake stage, when the tester selects charging mode 3 on the visual control panel, the CANoe hardware collects the BHM message (0x182756F4h) via CAN2, internally reassigns the "vehicle's maximum allowable charging voltage" A to 750V, and then sends it to the charging pile side via CAN1 (for other messages, no data modification is made; the CANoe hardware only performs forwarding). At this time, the charging pile receives the vehicle's maximum allowable charging voltage A=750V. According to the insulation voltage = Min(A,B), where B is the charging pile's maximum output voltage, the charging pile outputs an insulation detection voltage of 750V. In subsequent charging parameter configuration, charging, and charging end stages, the message data is only forwarded and not modified.

[0090] In one embodiment of this application, the charging request current setting 512 is a BCL modification setting for the charging phase. The charging request current setting 512 defines the charging pile request current mode 0~3, and the corresponding "vehicle charging request current C = current vehicle charging request current / 100 / 50 / 10" is used.

[0091] For example, after entering the charging phase, when the tester selects charging request current mode 3 on the visual control panel, the CANoe hardware collects the BCL message 0x181056F4h via CAN2, internally reassigns the "vehicle charging request current" C to 10, and then sends it to the charging pile via CAN1 (the other messages are not modified; the CANoe hardware only performs forwarding). At this time, the charging pile receives a charging request current C=10A and adjusts its output current to 10A. Simultaneously, using a waveform recorder and the CANoe hardware, the waveform of the charging pile's output current and CAN data can be observed and collected in real time, enabling dynamic response characteristic testing of the charging pile's current output capability.

[0092] In one embodiment of this application, the charging permission setting 514 is a BCL modification setting for the charging phase. The charging permission setting 514 defines the charging pile pause charging variable as 0 and 1, and the corresponding "charging allowed / prohibited" instruction E=0 (charging prohibited) / 1 (charging allowed).

[0093] For example, after entering the charging phase, the charging pile outputs voltage and current normally. When the tester sets the "Charging Pile Pause Charging Variable" to 0 on the visual control panel, the CANoe hardware collects the BSM message 0x181356F4h via CAN2, internally reassigns the "Charging Enable / Disable" command E to 0, and then sends it to the charging pile via CAN1. Other messages remain unmodified; the CANoe hardware only performs forwarding. At this time, the charging pile receives the charging enable / disable command = 0, and the charging pile pauses its current output. Using a waveform recorder and CANoe, the waveforms of the charging pile's output voltage and current, as well as the CAN data, can be observed and collected in real time, allowing for testing of the charging pile's start-stop characteristics.

[0094] In one embodiment of this application, the SOC limit release setting 513 is a BSM modification setting for the charging phase. The SOC limit release setting 513 defines the SOC charging limit variable as 0 and 1, corresponding to the instruction "SOC charging limit D=0 (limit) / 1 (no limit)".

[0095] In another embodiment of this application, the configuration information can also be obtained by reading a preset configuration file. The configuration file can be prepared in advance according to different DC charging test scenarios and standards, and contains detailed test parameter settings. When the host computer starts the test, it automatically reads the contents of the configuration file and quickly generates the corresponding message modification instructions, improving the efficiency and accuracy of the test, and is especially suitable for batch standard test tasks.

[0096] Thus, based on the CAPL programmable language supported by CANoe, CANoe possesses gateway forwarding capabilities. This gateway function allows modification of the relevant national standard charging message data content specified in GB / T27930.2-2024. Simultaneously, through the visual control panel of the CANoe software, it is linked one-to-one with the relevant national standard charging messages defined in CAPL, facilitating direct operation by testing personnel.

[0097] In addition, configuration information can also be set by the user based on CAPL codes.

[0098] One embodiment of this application relates to a test case, which is a collection of test steps and expected results designed for a specific test objective, and can be edited using the CAPL language.

[0099] In some embodiments of this application, such as Figure 4 As shown, the test adapter harness 21 also includes a charging socket and a second charging gun.

[0100] The charging socket is configured to connect to the first charging gun of the charging station. The second charging gun is configured to connect to both a charging socket and a vehicle socket.

[0101] In this way, by using the charging socket and the second charging gun, the direct communication between the charging pile and the vehicle is disconnected, which makes it easier to transfer the S+ and S- on the charging pile side to the CANoe hardware, as well as the S+ and S- on the vehicle side to the CANoe hardware.

[0102] In addition, such as Figure 4 As shown, each of the remaining charging ports of the charging pile is connected to each of the remaining charging ports of the vehicle in a one-to-one correspondence via test adapter harness 21.

[0103] Another aspect of this application provides a DC charging test method, which is applied to the DC charging test system provided in any of the foregoing embodiments. Figure 6 This document illustrates a flowchart of a DC charging test method provided in an embodiment of this application. Figure 6 As shown, the DC charging test method includes the following steps.

[0104] S61 uses a charging communication harness to connect the charging communication terminal of the charging pile to the charging communication terminal of the vehicle via CANoe hardware.

[0105] S62, using CANoe hardware, receives a designated message related to DC charging test sent from one of the charging pile and the vehicle via the charging communication harness; modifies the designated message based on the message modification instruction sent by the host computer; and sends the modified designated message to the other of the charging pile and the vehicle via the charging communication harness to perform DC charging test.

[0106] In some embodiments of this application, the DC charging test includes tests related to boost charging strategy verification, the message modification instruction includes the Battery Management System Handshake Message (BHM) modification instruction, and the specified message includes BHM.

[0107] S62, receiving a designated message related to DC charging testing from one of the charging pile and the vehicle via the charging communication harness; modifying the designated message based on a message modification instruction sent by the host computer; and sending the modified designated message to the other of the charging pile and the vehicle via the charging communication harness, may include: using CANoe hardware, during the charging handshake phase, receiving the BHM sent by the vehicle via the charging communication harness; modifying the BHM based on a BHM modification instruction sent by the host computer, and sending the modified BHM to the charging pile via the charging communication harness, so that the insulation voltage output by the charging pile is adjusted to the voltage value corresponding to the BHM modification instruction, in order to perform tests related to boost charging strategy verification.

[0108] In one embodiment of this application, modifying the BHM based on the BHM modification command sent by the host computer includes: modifying the parameter value in the BHM that indicates the maximum allowable charging voltage of the vehicle to the voltage value indicated by the BHM modification command.

[0109] In some embodiments of this application, the DC charging test includes a dynamic response characteristic test of the charging pile current output capability, the message modification instruction includes a battery charging demand message (BCL) modification instruction, and the specified message includes BCL.

[0110] S62, using CANoe hardware, receiving a designated message related to DC charging testing sent from one of the charging pile and the vehicle via the charging communication harness; modifying the designated message based on a message modification instruction sent by the host computer; and sending the modified designated message to the other of the charging pile and the vehicle via the charging communication harness to perform DC charging testing, may include: using CANoe hardware, during the charging phase, receiving a BCL sent by the vehicle via the charging communication harness; modifying the BCL based on a BCL modification instruction sent by the host computer, and sending the modified BCL to the charging pile via the charging communication harness, so that the output current of the charging pile is adjusted to the current value corresponding to the BCL modification instruction, to perform dynamic response characteristic testing of the charging pile's current output capability.

[0111] In one embodiment of this application, modifying the BCL based on the BCL modification instruction sent by the host computer includes: modifying the parameter value in the BCL that indicates the charging request current of the vehicle to the current value indicated by the BCL modification instruction.

[0112] In some embodiments of this application, the DC charging test includes a charging pile start-stop characteristic test, and the message modification instruction includes a BSM modification instruction, specifying the message as BSM.

[0113] S62, using CANoe hardware, receives a specified message related to DC charging testing sent from one of the charging pile and the vehicle via the charging communication harness; modifies the specified message based on a message modification instruction sent by the host computer; and sends the modified specified message to the other of the charging pile and the vehicle via the charging communication harness to perform DC charging testing. This may include: using CANoe hardware, during the charging phase, receiving a BSM sent by the vehicle via the charging communication harness; modifying the BSM based on a BSM modification instruction sent by the host computer, and sending the modified BSM to the charging pile via the charging communication harness, so that the charging pile controls the current output or controls the current to stop output according to the modified BSM to perform charging pile start-stop characteristic testing.

[0114] In one embodiment of this application, the BSM is modified based on the BSM modification instruction sent by the host computer, including modifying the parameter values ​​in the BSM that indicate whether charging is allowed or prohibited according to the BSM modification instruction.

[0115] In some embodiments of this application, S62, using CANoe hardware, receiving a designated message related to DC charging testing sent from one of the charging pile and the vehicle via a charging communication harness; modifying the designated message based on a message modification instruction sent by a host computer; and sending the modified designated message to the other of the charging pile and the vehicle via the charging communication harness to perform DC charging testing, may include: Using CANoe hardware, during the charging phase, the BCS sent by the vehicle is received via the charging communication harness; based on the BCS modification command sent by the host computer, the BCS is modified, and the modified BCS is sent to the charging pile via the charging communication harness, so that the charging pile continues to charge when the vehicle's state of charge reaches a preset threshold, in order to conduct a full charge test of the vehicle's boost charging strategy.

[0116] In one embodiment of this application, modifying the BCS based on the BCS modification instruction sent by the host computer includes: modifying the parameter value in the BCS that indicates the SOC charging limit according to the BCS modification instruction.

[0117] In some embodiments of this application, the DC charging test method further includes: using the DC communication harness of the test adapter harness to connect the charging pile to the DC high voltage positive terminal of the vehicle and to connect the charging pile to the DC high voltage negative terminal of the vehicle; and using a waveform recorder to collect the current signal and voltage signal on the DC communication harness during the DC charging test.

[0118] In some embodiments of this application, the DC charging test method further includes: using a host computer configured to generate message modification instructions based on configuration information and / or test cases.

[0119] It should be understood that the specific features, operations, and details described above with respect to the method of this application can also be similarly applied to the system of this application, or vice versa. Furthermore, each step of the method of this application described above can be performed by the corresponding component or unit of the system of this application.

[0120] It should be understood that the various modules / units of the system of this application can be implemented wholly or partially through software, hardware, firmware, or a combination thereof. Each module / unit can be embedded in the processor of the electronic device in hardware or firmware form or independent of the processor, or it can be stored in the memory of the electronic device in software form for the processor to call to execute the operation of each module / unit. Each module / unit can be implemented as an independent component or module, or two or more modules / units can be implemented as a single component or module.

[0121] Those skilled in the art will understand that the method steps of this application can be performed by a computer program instructing related hardware, such as electronic devices or processors. The computer program can be stored in a non-transitory computer-readable storage medium, and its execution causes the steps of this application to be performed. Depending on the context, any reference herein to memory, storage, or other media may include non-volatile or volatile memory. Examples of non-volatile memory include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), flash memory, magnetic tape, floppy disk, magneto-optical data storage device, optical data storage device, hard disk, solid-state drive, etc. Examples of volatile memory include random access memory (RAM), external cache memory, etc.

[0122] The technical features described above can be combined arbitrarily. Although not all possible combinations of these technical features are described, any combination of these technical features should be considered to be covered by this specification, provided that such combination does not contain contradictions.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A DC charging test system, characterized in that, include: Test adapter harness and CANoe hardware for controller area network development environment, wherein the test adapter harness includes a charging communication harness; The charging communication harness is configured to connect the charging communication terminal of the charging pile to the charging communication terminal of the vehicle through the CANoe hardware. The CANoe hardware is configured to receive a designated message related to DC charging testing sent from one of the charging pile and the vehicle via the charging communication harness; modify the designated message based on a message modification instruction sent by a host computer; and send the modified designated message to the other of the charging pile and the vehicle via the charging communication harness to perform the DC charging test.

2. The system according to claim 1, characterized in that, The DC charging test includes tests related to boost charging strategy verification, the message modification instruction includes the battery management system handshake message (BHM) modification instruction, and the specified message includes BHM; The CANoe hardware is configured to receive the BHM sent by the vehicle via the charging communication harness during the charging handshake phase; modify the BHM based on the BHM modification instruction sent by the host computer; and send the modified BHM to the charging pile via the charging communication harness, so that the insulation voltage output by the charging pile is adjusted to the voltage value corresponding to the BHM modification instruction, in order to perform the test related to the boost charging strategy verification.

3. The system according to claim 2, characterized in that, The modification of the BHM based on the BHM modification command sent by the host computer includes: Modify the parameter value in the BHM that indicates the maximum permissible charging voltage of the vehicle to the voltage value indicated by the BHM modification command.

4. The system according to claim 1, characterized in that, The DC charging test includes a dynamic response characteristic test of the charging pile current output capability; the message modification instruction includes a battery charging demand message (BCL) modification instruction; and the specified message includes BCL. The CANoe hardware is configured to receive the BCL sent by the vehicle via the charging communication harness during the charging phase; modify the BCL based on the BCL modification command sent by the host computer, and send the modified BCL to the charging pile via the charging communication harness, so that the output current of the charging pile is adjusted to the current value corresponding to the BCL modification command, so as to perform dynamic response characteristic test of the charging pile's current output capability.

5. The system according to claim 4, characterized in that, The modification of the BCL based on the BCL modification command sent by the host computer includes: Modify the parameter value in the BCL that indicates the charging request current of the vehicle to the current value indicated by the BCL modification command.

6. The system according to claim 1, characterized in that, The DC charging test includes a charging pile start-stop characteristic test, and the message modification instruction includes a power battery status message (BSM) modification instruction, wherein the specified message is BSM. The CANoe hardware is configured to receive the BSM sent by the vehicle via the charging communication harness during the charging phase. Based on the BSM modification command sent by the host computer, the BSM is modified, and the modified BSM is sent to the charging pile via the charging communication harness, so that the charging pile controls the current output or controls the current to stop output according to the modified BSM, so as to perform the start-stop characteristic test of the charging pile.

7. The system according to claim 6, characterized in that, Based on the BSM modification command sent by the host computer, the BSM is modified, including: Modify the parameter value in the BSM that indicates charging is allowed or prohibited according to the BSM modification instruction.

8. The system according to claim 1, characterized in that, The DC charging test includes a full charge test of the vehicle boost charging strategy, and the message modification instruction includes a battery charging total status message (BCS) modification instruction, wherein the specified message is BCS. The CANoe hardware is configured to receive the BCS sent by the vehicle via the charging communication harness during the charging phase; modify the BCS based on the BCS modification instruction sent by the host computer, and send the modified BCS to the charging pile via the charging communication harness, so that the charging pile continues to charge when the vehicle's state of charge reaches a preset threshold, in order to perform a full charge test of the vehicle's boost charging strategy.

9. The system according to claim 8, characterized in that, Based on the BCS modification command sent by the host computer, the BCS is modified, including: Modify the parameter value in the BCS that indicates the SOC charging limit according to the BCS modification instruction.

10. The system according to claim 1, characterized in that, Also includes: Wave recorder; The test adapter harness also includes a DC communication harness, which is configured to connect the charging pile to the DC high voltage positive terminal of the vehicle and to the DC high voltage negative terminal of the vehicle. The waveform recorder is connected to the DC communication harness and is configured to acquire current and voltage signals on the DC communication harness during the DC charging test.

11. The system according to claim 1, characterized in that, The test adapter harness also includes a charging socket and a second charging gun; The charging socket is configured to connect to the first charging gun of the charging pile; The second charging gun is configured to connect to the charging socket and to the vehicle socket of the vehicle.

12. The system according to claim 1, characterized in that, The vehicles include electric vehicles or hybrid vehicles.

13. The system according to any one of the preceding claims, characterized in that, It also includes the host computer; The host computer is configured to generate the message modification instruction based on configuration information and / or test cases.

14. A DC charging test method, characterized in that, The method using the DC charging test system as described in any one of claims 1-13 includes: Using the charging communication harness, the charging communication terminal of the charging pile and the charging communication terminal of the vehicle are connected through the CANoe hardware. Using the CANoe hardware, a designated message related to DC charging test is received from one of the charging pile and the vehicle via the charging communication harness; the designated message is modified based on the message modification instruction sent by the host computer; and the modified designated message is sent to the other of the charging pile and the vehicle via the charging communication harness to perform the DC charging test.

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