Control method and control system of high-voltage system of electric vehicle and vehicle having control system

Abstract

The invention discloses a control method and a control system of a high-voltage system of an electric vehicle and the vehicle having the control system. The method comprises the following steps of judging whether a pathway is in a connected state when an emergency fault occurs; if the pathway is in the connected state, judging whether a positive pole contactor is in a closed state and whether a closing command is valid; sending a disconnection command if the positive pole contactor is in the closed state and the closing command is valid; sending a negative pole contactor disconnection command to a negative pole contactor; judging whether a precharge contactor is in the closed state and whether the closing command is valid; and sending the disconnection command to realize emergency disconnection of the high-voltage system if the precharge contactor is in the closed state and the closing command is valid. By applying the control method disclosed by the embodiment of the invention, when the emergency fault occurs, the positive pole contactor, the negative pole contactor and the precharge contactor are disconnected in sequence, emergency disconnection of the high-voltage system is achieved, the contactors are guaranteed to be actually disconnected, the safety of the vehicle and a power battery is improved, and potential safety hazards are eliminated.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a high-voltage system control method and system of an electric vehicle and a vehicle having the same. Background technique [0002] When the vehicle fails or is powered off normally, it is necessary to disconnect the relay in the high-voltage system, thereby cutting off the power battery voltage circuit. [0003] In the related art, during the normal disconnection process, the disconnection of the high-voltage system, for example, needs to consider the positive relay and the negative relay, and a positive relay (Positive Contactor, PC) and / or negative relay (Negative Contactor, NC) disconnection command can be sent to Open the corresponding relay to complete the disconnection of the high voltage system. When an emergency fault such as insulation fault occurs, or overvoltage, overtemperature or overcurrent occurs in the power battery pack, for example, it is necessary to conside...

AI Technical Summary

Problems solved by technology

However, due to the large current in the power battery voltage loop at this time, it is easy to cause one or all relays to fail to disconnect normally, posing a safety hazard

In addition, it is impossible to diagnose whether the relay is actually disconnected. Once the relay is not disconnected, the follow-up remedial opportunity will be missed, the consequences are immeasurable, and the safety of the vehicle and power battery cannot be guaranteed.

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