Fault monitoring method and fault monitoring system

A fault monitoring system for monitoring an operating state of a power system of a motor vehicle, wherein the fault monitoring system comprises a signal collection subsystem and a data processing subsystem, wherein

• the signal collection subsystem comprises:
• a sound sensor arranged in a cab of the motor vehicle to collect in real time a sound signal in the cab;
• and
• one or more vibration sensors arranged at one or more monitoring positions in the power system, respectively, to collect in real time corresponding one or more vibration signals;
• and
• the data processing subsystem comprises:
• a first calculation module configured to calculate a frequency response function between the sound signal and each vibration signal and obtain a peak point frequency corresponding to a peak point of each frequency response function;
• a second calculation module configured to calculate a coherence feature function between each vibration signal and the sound signal and obtain an amplitude corresponding to the peak point frequency of each frequency response function;
• a judgment module configured to judge whether the amplitude corresponding to the peak point frequency of each frequency response function is greater than a predetermined threshold value;
• and
• a determining module configured to:
• when the amplitudes corresponding to the peak point frequencies of one or more frequency response functions are each greater than the predetermined threshold value, determine that a fault occurs at the monitoring positions where the vibration signals corresponding to the one or more frequency response functions are collected.

A fault monitoring system, comprising:

• a signal collection subsystem comprising a sound sensor arranged in a cab of a motor vehicle to collect in real time a sound signal in the cab, and one or more vibration sensors arranged at one or more monitoring positions in a power system of the motor vehicle, to collect in real time corresponding one or more vibration signals;
• a vehicle controller communicatively coupled to the signal collection system and which is configured to:
• receive the sound signal and the one or more vibration signals;
• calculate a frequency response function between the sound signal and each vibration signal and obtain a peak point frequency corresponding to a peak point of each frequency response function;
• calculate a coherence feature function between each vibration signal and the sound signal and obtain an amplitude corresponding to the peak point frequency of each frequency response function;
• determine whether the amplitude corresponding to the peak point frequency of each frequency response function is greater than a predetermined threshold value;
• and
• when the amplitudes corresponding to the peak point frequencies of one or more frequency response functions are each greater than the predetermined threshold value, determine that a fault occurs at the monitoring positions where the vibration signals corresponding to the one or more frequency response functions are collected.