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389results about How to "Achieve early diagnosis" patented technology

Short circuit fault self-detection method in single battery

The invention discloses a short circuit fault self-detection method in a single battery. The method comprises the following steps of: S1, building a first-order equivalent circuit model of the battery, determining a function relation between a state of charge (SOC) and an open-circuit voltage (OCV), and recognizing model parameters, S2, measuring load current and terminal voltage of the battery inreal time, S3, calculating ampere-hour increments at adjacent moments, estimating the SOC of the battery online by adopting a closed-loop state observer, and calculating an internal short circuit current according to the obtained ampere-hour increments and an SOC change value, S4, filtering the estimated internal short circuit current, and identifying the internal short circuit resistance of thebattery online by adopting a recursive least square method with an adaptive forgetting factor according to the filtered internal short circuit current and load voltage. According to a preset internalshort circuit resistance threshold, the internal short circuit state of the battery is compare3d and judged. Online identification of the short circuit resistance in the single battery can be realizedonly by measuring the terminal voltage and the load current of the single battery, and other single battery information in the battery pack is not needed.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY

Fire detection, prevention and control system of electronic control cabinet and control method thereof

The invention relates to a fire detection, prevention and control system of an electronic control cabinet. The fire detection, prevention and control system comprises a data acquisition device, a fire extinguishing device and a main control device which are arranged in an electronic control cabinet body, wherein the data acquisition device is used for acquiring detection data of each detection node in the electronic control cabinet in real time, and transmitting the detection data to the main control device; the fire extinguishing device is used for accepting a control signal sent by the main control device, and carrying out fire control and processing on an area with a fire early warning; a fire extinguishing control module is used for sending a control signal to the fire extinguishing device according to the instruction of a CPU (central processing unit) core module. The invention further discloses a control method based on the system. The control method comprises the following steps: transmitting the CO and smoke concentration acquired in real time to the CPU core module; processing by a pre-detection data filter model to obtain a characteristic extraction value; if fire early warning standards are met, sending an early warning or starting the fire extinguishing device. The fire detection, prevention and control system and the control method disclosed by the invention are capable of performing real-time detection on a small space such as the electronic control cabinet, eliminating fire in the bud, and reducing the false alarm rate of fire early warning.
Owner:南京能启能电子科技有限公司 +3

Drill pump error detection and diagnostic method based on kinetic model and system of method

ActiveCN102758613AImprove recognition effect and accuracyEnsure safetyConstructionsSystem failureEngineering
The invention relates to a drill pump error detection and diagnostic method based on a kinetic model. The method comprises the following steps of: 1, measuring a vibration signal and a pump stroke signal of a drill pump; 2, performing elementary section processing on the vibration signal according to a pump stroke period; 3, separating various characteristic signal components of the vibration signal of the drill pump to realize qualitative diagnosis on the errors of the drill pump; 4, performing characteristic parameter counting analysis on time domains and frequency domains of sub-section vibration signals of which attributes are determined to build actual measurement drill pump state vectors; 5, building the kinetic model of the drill pump; 6, optimizing and matching the actual measurement drill pump state vectors and the vectors in error characteristic matrixes in the drill pump system; and 7, displaying error detection and diagnosis results of the drill pump. With the adoption of the method, various characteristic information of the errors of the drill pump can be accurately and subtly extracted and reflected, the steady recognition and the qualitative diagnosis on the errors of the drill pump are realized, and the detection and the early warning of the running state of the drill pump are supplied in time so as to turn scheduled maintenance into on-condition maintenance.
Owner:常州贝源信息科技有限公司

Shale gas fracturing downhole accident early diagnosis and alarm method and device

The embodiments of the present invention provide a shale gas fracturing downhole accident early diagnosis and alarm method and device. The method includes the following steps that: the on-line monitoring data of reference variables which reflect a shale gas fracturing downhole condition are acquired; the time window of the online data is set according to a preset width; the time window is dividedinto a plurality of time segments with the same width, and linear fitting is performed on the online monitoring data in each time segment, so that the linear relationship curve of the online monitoring data in each time segment can be correspondingly obtained; corresponding trend feature primitives are determined according to the slope of the linear relationship curve of each time segment, trend feature vectors are built according to the trend feature primitives; and the trend feature vectors are substituted into a preset accident classifier, so that accident types corresponding to the onlinemonitoring data can be predicted, and corresponding alarm information is sent. With the shale gas fracturing downhole accident early diagnosis and alarm method and device of the embodiments of the present invention adopted, shale gas fracturing downhole accident early diagnosis and alarm can be achieved.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
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