3results about How to "Avoid diagnostic errors" patented technology

The application belongs to the technical field of arc fault detection, and particularly relates to a series arc fault detection method and system, which comprises the following steps: acquiring a bus current signal; analyzing the acquired current signal, calculating and judging time domain characteristic quantities of the current signal when an arc fault occurs, and obtaining screened time domain characteristic quantities; performing energy decomposition on the screened time domain characteristic quantities, obtaining fuzzy entropy of a variational mode component, and combining the obtained fuzzy entropy to obtain characteristic evaluation weights; diagnosing the arc fault according to a support vector machine and the obtained characteristic evaluation weights, and realizing series arc fault detection.

The present invention relates to a device (3) for protecting an optical sensor (2), such as a camera, of a vehicle. The protective device (3) includes: a protective housing (4) configured to receive the optical sensor (2), the protective housing (4) being mounted to be movable about a rotation axis (I-I) and including an optical window (10) configured to be arranged in the field of view of the optical sensor (2); and an electric motor (6) coupled to the protective housing (4) to rotate the protective housing. The protective device (3) further includes an element for enhancing heat transfer, the element being configured to improve heat transfer of the protective housing (4).

The utility model discloses an intelligent fault diagnosis device for a communication transmission line, which comprises a shell, a sealing cover is arranged on the front surface of the shell, a touch display screen is fixedly embedded in the front surface of the sealing cover, and a heat conduction carrier plate is fixedly arranged on the inner wall of the shell. A processor chip, a wireless communication module, a data acquisition unit and a temperature sensor are installed on the front face of the heat conduction carrier plate, and a current and voltage sensor and an optical power sensor are installed on the inner wall of the shell. According to the utility model, through the current and voltage sensor and the optical power sensor in the housing, electrical parameters of a communication line can be automatically acquired in real time, and in addition, in cooperation with data processing and analysis of the data acquisition unit and the processor chip and cloud intelligent diagnosis of the cloud server, the fault diagnosis module and the fault diagnosis library, manual section-by-section troubleshooting is not needed, and the working efficiency is improved. Data processing and fault judgment can be rapidly completed, and diagnosis errors caused by factors such as insufficient experience of personnel and subjective judgment errors are avoided.