Vehicle-mounted charging mode end phase control method

Abstract

The invention belongs to the technical field of automobile control systems and provides a vehicle-mounted charging mode end phase control method. The method comprises steps as follows: whether a vehicle-mounted charging relay is disconnected is detected after a command for disconnecting the vehicle-mounted charging relay is sent; if yes, whether a main positive sequence relay and a main negative sequence relay are disconnected is detected after a command for disconnecting the main positive sequence relay and the main negative sequence relay is sent; if the main positive sequence relay and the main negative sequence relay are both disconnected, the vehicle-mounted charging relay is successfully disconnected. With the adding of the process of detecting whether a vehicle-mounted charger, the main positive sequence relay and the main negative sequence relay are disconnected, disconnection of the whole high-voltage relay is guaranteed, damage to a battery pack due to unsuccessful disconnection of the high-voltage relay is avoided, and the service life of the battery pack is prolonged. Meanwhile, the safety level of the vehicle is improved with the control method, and the vehicle performance 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 vehicle 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 on-board charging mode The process is usually: enter the on-board 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-vo...

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

Images