Control Strategy for DC Charging

The electrical principle of DC charging not only needs to meet the standard requirements, but also the communication protocol with the vehicle controller must comply with the national standard format and content in order for the vehicle to be charged on the market. Taking a project as an example, charging is to charge the power battery. In order to facilitate the implementation of control, the BMS of the power battery is directly used for information interaction and detection with the DC Charging station. VCU is only used as an auxiliary judgment. Its control strategy and sequence are as follows:

① The vehicle is not using A+and A - auxiliary power supplies as they are external to the vehicle and their reliability is unstable, therefore they are not used.
② BMS detects CC2 signal and interacts with DC Charging station through S+and S -.
③ When the vehicle is in a dormant or parked state, when the DC charging plug and DC charging socket are connected, the BMS detects a CC2 signal and wakes up automatically.
④ After BMS wakes up, the VCU wakes up and the vehicle enters DC charging mode.
⑤ The DC Charging station judges whether the charging socket and plug are fully connected by detecting the CC1 signal.
⑥ BMS and DC Charging station exchange information.
⑦ BMS judges according to the information fed back by the DC Charging station and the vehicle status, and sends the start or stop of charging to the DC Charging station.
⑧ The DC charging station executes or stops charging based on the CC1 signal and BMS feedback information.
⑨ After charging is completed or stopped, the entire vehicle enters sleep, reducing energy consumption.

The above is a simple control process that is similar to AC charging in terms of usage and operational requirements. However, during the DC charging process, when the charging is stopped, the gun needs to be pulled out and inserted again before the second charging can be carried out. This method is different from AC charging and is also to ensure charging safety.

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