公开(公告)号：US20230228818A1

公开(公告)日：2023-07-20

申请号：US18007944

申请日：2021-04-06

Applicant: Huawei Technologies Co., Ltd.

Inventor： Pinhui Chen ,  Weicai Zeng ,  Yuanji He ,  Bo Xie ,  Xiujiang Ma

IPC: G01R31/327 ,  G01R19/165

CPC classification number: G01R31/3278 ,  G01R19/165

Abstract: A fault diagnosis method includes detecting a state of a relay device, sending a fault diagnosis trigger signal to the relay device based on the stateto enable the relay device to enter a fault diagnosis mode, where the fault diagnosis trigger signal includes one or more of a variable supply voltage value, a transmit/receive control signal, and a diagnosis control signal, detecting a state of the relay device in the fault diagnosis mode, determining a fault code based on the state, and determining a fault based on the fault code.