A method for controlling the end stage of fast charging mode

Abstract

The invention belongs to the technical field of vehicle control systems, and provides a control method for an end stage of a quick charge mode. The control method comprises sending a command to disconnect a quick charge relay, and detecting whether the quick charge relay is disconnected or not; if the quick charge relay is disconnected, sending a command to disconnect a vehicle-mounted charge relay, and detecting whether the vehicle-mounted charging relay is disconnected or not; if the vehicle-mounted charging relay is disconnected, sending commands to disconnect a main positive relay and a main negative relay, and detecting whether both of the main positive relay and the main negative relay are disconnected or not. If both of the main positive relay and the main negative relay are disconnected, the quick charge and disconnection are succeeded. In the control method, steps of detecting whether the quick charge relay is disconnected or not, detecting whether the vehicle-mounted charger is disconnected or not, detecting whether the main positive relay is disconnected or not, and detecting whether the main negative relay is disconnected or not are added, to make sure that the whole high-voltage relay is disconnected, damages on a battery pack caused by unsuccessful disconnection of the high-voltage relay can be avoided, and the service life of the battery pack can be prolonged. At the same time, by adopting the control method, the safety grade of a vehicle is raised, and the performance of the vehicle is optimized.

Description

technical field [0001] The invention belongs to the technical field of automobile control systems, and in particular relates to a method for controlling the end stage of a fast charging mode. Background technique [0002] As people continue to pay attention to energy security, new energy vehicles have also become the focus of people's increasing attention. In the future, electric vehicles will become the key direction of automotive technology development. The energy of pure electric vehicles comes from the battery pack, and the energy source of the battery pack comes from the charging process. During the charging process of the whole vehicle, a charging control function is required. In the existing control system, the control of the end stage of the fast charging mode The process is usually: enter the fast charging and power-off process, first determine whether the battery pack is fully charged, if the battery pack is fully charged, directly disconnect all high-voltage relay...

AI Technical Summary

Problems solved by technology

[0003] In the existing technical solution, only the operation command to turn off the high-voltage relay is executed, but in fact, in the process of turning off the high-voltage relay, if there is a problem that the relay fails to power off, it cannot be diagnosed in this control logic , it is easy to cause damage to the battery pack and shorten its service life, and this control method reduces the safety level of the vehicle and affects the performance of the vehicle; at the same time, the existing control process does not take into account the fault state encountered during power-off, These failures will also cause vehicle control logic disorder and reduce vehicle safety

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