The charging gun comprehensive tester verifies the accuracy of data transmission during communication function testing. This process revolves around communication protocol compliance, data integrity, real-time performance, and anti-interference capabilities. By simulating data interaction in real charging scenarios, combined with standardized testing procedures and automated analysis tools, it ensures stable and reliable communication between the charging gun and the charging pile or vehicle.
Communication protocol compliance verification is fundamental to data transmission accuracy. Communication between the charging gun and the charging pile or vehicle must adhere to specific protocol standards, such as the communication procedures defined in the GB/T 18487 series of standards. The charging gun comprehensive tester simulates the communication module at the charging pile or vehicle end, sending command messages conforming to the protocol specifications to the charging gun and capturing the charging gun's response messages. By parsing the message format, field content, and interaction timing, it verifies whether the charging gun strictly follows the protocol requirements. For example, during the charging handshake phase, the charging gun comprehensive tester checks whether the charging gun sends the correct version information and parameter configuration requests as required by the protocol, avoiding communication interruptions or data errors due to protocol incompatibility.
Data integrity verification ensures that no data is lost or tampered with during transmission. The charging gun comprehensive tester simulates the transmission of critical information during the charging process, such as charging parameter configuration and status updates, by sending test data packets containing specific identifiers or verification fields. At the receiving end, the tester compares the sent and received data to check for byte loss, out-of-order sequences, or verification errors. For example, during the charging phase, the tester sends continuous data packets containing parameters such as current and voltage, verifying that the charging gun completely receives and correctly relays this data, preventing charging control anomalies due to missing data.
Real-time verification focuses on data transmission latency and response speed. Communication during charging must meet real-time requirements. For example, in the event of a fault, the charging gun must quickly upload abnormal information to the charging station or vehicle to trigger protection mechanisms. The charging gun comprehensive tester simulates sudden fault scenarios, such as overcurrent and overvoltage, recording the time interval between the charging gun detecting the fault and sending an alarm signal, verifying whether it completes communication within the time limit specified in the protocol. Simultaneously, the tester evaluates the latency stability of the charging gun during continuous data transmission, ensuring that control commands (such as power adjustment) during charging are executed promptly.
Interference immunity verification addresses communication reliability in complex electromagnetic environments. Charging guns may face challenges such as electromagnetic interference and signal attenuation in real-world use. The charging gun comprehensive tester evaluates the communication robustness of the charging gun by simulating high-noise environments or signal shielding scenarios. For example, in withstand voltage testing, the charging gun comprehensive tester applies a high-voltage pulse between the charging gun and the communication line, observing whether communication is interrupted due to interference or whether data errors occur. Furthermore, the charging gun comprehensive tester simulates scenarios of parallel communication between multiple devices to verify the data transmission stability of the charging gun in complex networks.
The application of automated testing tools improves verification efficiency and accuracy. Modern charging gun comprehensive testers typically integrate automated testing software, which can preset multiple test cases and execute them automatically, reducing human error. The testing software can display communication message content, transmission timing, and error statistics in real time, helping engineers quickly locate problems. For example, in batch testing, the charging gun comprehensive tester can automatically complete the communication function verification of multiple charging guns and generate reports containing detailed test data, providing a basis for product optimization.
Compatibility verification ensures that the charging gun is compatible with different manufacturers and standards. With the diversification of charging interface standards, charging guns need to support multiple communication protocols (such as CHAdeMO, CCS, etc.). The charging gun comprehensive tester verifies the accuracy of data transmission across standard scenarios by switching between different communication modes. For example, for charging guns supporting multiple protocols, the charging gun comprehensive tester simulates the charging process under different protocols to check whether it can correctly identify the protocol type and complete data interaction.
Long-term stability verification focuses on the durability of communication functions. The charging gun comprehensive tester performs continuous, long-term communication tests on the charging gun, simulating high-frequency data transmission scenarios in real-world use, to check whether the communication module experiences performance degradation or malfunction due to long-term operation. For example, in aging tests, the charging gun comprehensive tester continuously sends data packets and records the communication error rate to evaluate the data transmission reliability of the charging gun throughout its lifespan.
