13results about How to "Meet reliability requirements" patented technology

This invention provides a dust pollution detection method and system based on image recognition, belonging to the field of image processing technology. The method includes: acquiring a group of dust images of a region to be detected, and determining a target image from the dust image group based on a preset filtering rule; performing preprocessing on the target image to obtain a binarized dust image; determining an improved grayscale mean to characterize the global coverage density of the dust based on the binarized dust image, and determining a fractal dimension to characterize the local morphological complexity of the dust using an improved box counting method based on the binarized dust image; constructing a pollution factor based on the improved grayscale mean and the fractal dimension, and assessing the dust pollution level based on the pollution factor. This invention achieves a rapid, stable, and structurally discriminative quantitative assessment of dust pollution status in semi-enclosed environments such as tunnels.

This invention relates to the field of lithium-ion battery manufacturing technology, specifically providing a full-tab battery cell for large cylindrical batteries, its preparation method, and applications. This invention innovatively employs a "winding-fixing-laser axial cutting-graded flattening" process flow, changing the traditional "cut-then-winding" process long used in the industry, achieving a breakthrough in the precision of tab forming. Specifically, after the bare cell is wound, the blank areas of each current collector layer have formed a stable stacked structure, which is precisely fixed using a special fixture and simultaneously cut along the axial direction by laser, completing the high-precision forming of multiple tabs in one step. This method fundamentally eliminates the problem of accumulated deviations caused by step-by-step operations in traditional winding processes, stably controlling the tab alignment accuracy within 0.1mm, effectively solving the long-standing problem of alignment consistency in existing technologies.

This utility model discloses an ultra-thin stacked structure consisting of a battery, a motherboard, a button bracket, a button board, and a shielding cover. The motherboard has a first connecting surface connected to the battery, and this first connecting surface is a single-sided component. The motherboard is located inside the button bracket, and the button board is located outside the button bracket. The motherboard and the button board are respectively connected to the button bracket. The shielding cover is placed on a second connecting surface of the motherboard, which is opposite to the first connecting surface. This utility model, by adopting a single-sided design and a battery-motherboard mounting design in the battery area, reduces the height of components on the battery side, thereby effectively reducing the overall thickness. The 4G component stacking density is reduced, signal interference is decreased, and the shielding cover design prevents short circuits with taller components during reliability testing, meeting the stringent performance and reliability requirements of 4G communication.

This invention discloses a method for estimating the speed and position of a permanent magnet synchronous motor (PMSM) based on a third-order switched extended state observer. Specifically, based on the mathematical model of the PMSM, a back-EMF observer based on a sliding mode observer is constructed to obtain the estimated back-EMF. Further, the estimated back-EMF signal is processed using a low-pass filter and amplitude normalization. The processed back-EMF is then used as the input signal to a position estimation scheme based on the third-order switched extended state observer, achieving accurate estimation of the PMSM's speed and position under different operating conditions. This invention is simple in principle and easy to implement. It combines the advantages of both third-order linear and third-order nonlinear extended state observers, improving estimation accuracy and dynamic performance while reducing the adverse effects of noise on the estimation scheme. This solves the technical problems of low estimation accuracy, high noise sensitivity, and difficulty in parameter tuning in existing estimation schemes.

The invention belongs to the technical field of vehicle-mounted networks, and discloses a 10BASE-T1S network fault rapid positioning method and system, and the method comprises the steps: constructing a fault management sub-layer which comprises a master node and slave nodes; the master node receives health frames sent by the slave nodes according to a preset period, and the master node constructs a node sequence mapping table when receiving the health frames; determining a fault suspicious interval according to the fault initial judgment result; the sequence breakpoint analysis comprises single node breakpoint analysis, continuous node breakpoint analysis and sequence jump anomaly analysis; determining a target fault node; determining a fault node type to which the target fault node belongs based on a self-checking feedback result; and executing a hierarchical recovery strategy according to the fault node type. According to the method, the fault type is accurately judged, the troubleshooting efficiency is high, the fault recovery does not need manual intervention, the bandwidth occupation is small, and the problems that the fixed polling frequency is adopted and the bandwidth occupation is uncontrollable are avoided.

This invention discloses a method for local repair of downgraded quartz crucibles and the repaired quartz crucible, relating to the field of quartz crucible repair technology. The key technical points include the following steps: classifying the quartz crucibles to be graded according to defect size; classifying quartz crucibles with defect sizes no larger than a preset threshold as repairable C1 grade, and quartz crucibles with defect sizes larger than the preset threshold as C2 grade for providing repair material; removing the defective area of ​​the C1 grade quartz crucible to form a notch; cutting and obtaining repair material from the defect-free area of ​​the C2 grade quartz crucible, the size of the repair material being configured to be larger than the notch size; locally heating the edge of the repair material to be joined to the quartz softening temperature, then pressing the softened repair material into the notch, and after cooling, forming an integral part with the C1 grade quartz crucible. This invention can utilize previously scrapped quartz crucibles, effectively improving the yield of downgraded quartz crucibles and reducing raw material consumption.

This invention provides a differential switch device and an analog switch chip, relating to the technical field of signal transmission. The differential switch device and analog switch chip provided by this invention include an analog switch and a control circuit connected to the analog switch in the switching unit of the differential switch device. The control circuit includes a logic operation unit and a voltage conversion unit connected to the control terminal of the analog switch. The logic operation unit is used to acquire the differential signal input from the input interface, perform logic operations based on the differential signal, and output a first voltage signal to the voltage conversion unit. The voltage conversion unit is used to convert the first voltage signal, output a second voltage signal corresponding to the first voltage signal, and input the second voltage signal to the control terminal of the analog switch to control the analog switch. During the control process, this helps to ensure the linearity of the analog switch, not only meeting users' requirements for different performance and reliability, but also helping to improve the transmission efficiency of high-frequency signals.

The utility model discloses a high -speed four -channel digital isolator package shell, including ceramic shell and electrode, the ceramic shell body includes ceramic base and seal ring, and the seal ring is brazed with ceramic base through solder, guarantees the air -tightness of packaging, the first recess is made in the ceramic base, two second recesses are still designed in the first recess, and the inner electrode is made in the first recess, second recess, and the inner electrode is connected with the outer electrode of ceramic shell bottom through the conductive column and metal interlayer, the outer electrode has 16, and all leads from the side, the inner electrode on the first recess is the wire bonding area, and the chip sintering is flush with the first recess, and the wire bonding of chip and inner electrode is convenient. The second recess is as the chip sintering area, and the recess increases the longitudinal insulation distance of parts, and the control of chip sintering alignment and solder is convenient. The utility model has the characteristics of good insulation performance, high -speed low loss, high voltage resistance, small volume, good air -tightness, strong corrosion resistance, high reliability etc.

This invention discloses an online monitoring device and method for electricity meters and terminal relay contacts based on the dual-frequency difference method, belonging to the field of electrical variable measurement technology. The device includes a high-frequency constant current source, a power frequency current acquisition module, a voltage acquisition module, a separation module, and a calculation and judgment module. It simultaneously injects power frequency current and a constant high-frequency current into the line segment where the relay contacts are located, acquires the mixed voltage, separates the power frequency and high-frequency components, calculates the power frequency impedance and high-frequency impedance respectively, and then obtains the magnitude of the difference between the two. The method includes injection, acquisition, separation, calculation, and judgment steps. This invention compensates for interference from parameters such as the inherent resistance of the line by calculating the dual-frequency impedance difference. The magnitude of the difference is only related to the contact resistance and contact capacitance of the contacts themselves, realizing online, real-time, and quantitative monitoring of the contact state of the relay contacts, and accurately identifying early deterioration faults such as contact oxidation and wear.

The application discloses a double gear pump, a front pump assembly comprises a front pump body and a front cover, a rear pump assembly comprises a rear pump body, the front cover is fixedly connected with the front pump body, the front pump body is fixedly connected with the rear pump body, a front pump connecting portion is arranged between the front cover and the front pump body, a rear pump connecting portion is arranged between the front pump body and the rear pump body, and the front pump connecting portion and the rear pump connecting portion are both provided with a first connecting assembly and a second connecting assembly. The front pump body and the front cover are positioned and connected through the front pump connecting portion, the front pump body and the rear pump body are positioned and connected through the rear pump connecting portion, there is no intermediate body structure between the front pump and the rear pump, and the overall structural compactness and connection stability are improved. Since the second connecting assembly is arranged between the front cover and the front pump body and between the front pump body and the rear pump body, the first connecting assembly of the front pump body and the rear pump body can both achieve the effect of inhibiting movement, the positioning precision and transmission precision of the gear pump are improved, and the volumetric efficiency under various rotational speeds and pressures is improved.

This application discloses a method and apparatus for determining the design parameters of a mold for a range extender connecting mechanism. The method includes: acquiring a geometric model of the range extender; performing modal simulation on the range extender geometric model to obtain modal simulation results; performing frequency response simulation on the range extender geometric model to obtain frequency response simulation results; adjusting the structural attribute parameters and / or positional connection parameters of the connecting mechanism in the range extender geometric model based on the modal simulation results and frequency response simulation results; and adjusting the design parameters of the mold used to manufacture the connecting mechanism based on the adjusted parameters. According to the embodiments of this application, the precision of the mold for the range extender connecting mechanism can be improved.

The application provides a special vehicle fuel tank and a fuel draining tool. The fuel tank is formed by steel plates through corner-to-corner welding, and has high welding strength and good overall structural reliability. The fuel tank is fixed to the deck of the vehicle body in the form of a cantilever beam by a support and fixing bolts, and the overall fuel tank is fixed reliably. The oil filler port is closed by a float to prevent fuel overflow. The fuel draining port is designed with a spring and a steel ball, and the fuel tank is manually controlled by the fuel draining tool. The fuel draining tool is welded with a fuel draining connector on the fuel draining connector, and is suitable for fuel draining ports of different specifications. The fuel tank can be drained by manual control. The application has good reliability and maintainability, and can meet the requirements of fuel receiving speed and reliability.

This invention relates to the field of automation control technology, and more particularly to a non-destructive upgrade automation control device and method for stand-alone equipment. The device includes a control system, an actuator, and a feedback device. The control system is based on a microcontroller, the actuator is an electronic touch clicker, and the feedback device is a camera detection unit. The method establishes color reference data related to the screen image through initial calibration, executes click operations after receiving instructions from a host computer, and forms a closed-loop control system combined with camera visual feedback. It automatically verifies the operation results and calibrates deviations, while also possessing a fault alarm mechanism. This invention achieves low-cost automated upgrades of older touchscreen devices through an external modular design combined with visual feedback to form a closed-loop control system, solving the problems of high cost, poor compatibility, and insufficient stability of existing solutions.