28results about How to "No additional cost" patented technology

The utility model relates to mould technical field especially relates to a mould structure capable of automatically falling injection plastics head. It includes upper die and lower die who sets up correspondingly up and down, and forms injection cavity between upper die and lower die, and upper die includes front plate, the stripper plate who is connected with front plate bottom surface through stripper plate pull rod, and the female die plate who is connected with front plate through small pull rod, and the stripper plate placing groove who is used to install stripper plate is set up on female die plate upper surface. The utility model has the advantages that: after the technical scheme injection moulding is completed, the male die plate retreats, the front plate and the female die plate open, the stripper plate pull rod forces the stripper plate to separate from the female die plate, the sprue is pulled out by the stripper plate from the female die plate and automatically falls, the male die plate continues to retreat and separates from the female die plate, and the product is ejected and taken out, the flow channel structure is pulled out by the material pulling plate, and after the injection moulding is completed, it is automatically dropped, the mould is simplified, and the process of increasing manpower to take the flow channel or increasing the mechanical hand to take out the flow channel is avoided.

The invention discloses a pre-charging control method and circuit for a flying capacitor three-level totem pole PFC (Power Factor Correction). The pre-charging control method comprises the following steps: step 1, charging a direct-current bus by alternating current of a power grid; step 2, when the alternating current voltage of the power grid is greater than the lower limit of the equipment protection value, entering step 3; 3, if the voltage value of the flying capacitor is lower than a given value, controlling a power tube to be conducted through a proportional controller, and charging the flying capacitor by the alternating current of the power grid; if the voltage value of the flying capacitor is higher than the given value, the power tube is turned off, and the flying capacitor discharges through the discharge resistor; 4, when the difference value of the flying capacitor voltage value and the given value is kept within the preset range, the pre-charging stage is ended, and after boosting of the direct-current bus is ended, the pre-charging circuit exits, and the equipment enters a normal working mode. According to the invention, under the condition that an external circuit is not added, pre-charging of the flying capacitor of the flying capacitor three-level totem pole PFC is realized by using a proportional controller algorithm which is easy to realize.

The present invention provides a single sideband signal generator, comprising: a modulator configured to generate a first modulated optical signal and a second modulated optical signal having the same amplitude; and the sideband suppression light circuit based on the first light delay line is used for generating a full-carrier single-side-band signal, and / or the sideband suppression light circuit based on the second light delay line is used for generating a carrier-suppressed single-side-band signal. The present invention simplifies the structure by saving half the space occupied by redundant signal electrodes, and also reduces the RF power consumption by half by removing an RF mixer. The provided single side band (SSB) signal generator has the advantages of compact structure, low cost and energy conservation. By reasonably designing the length of the optical delay line, the generator can be easily expanded to a higher frequency range on the premise of not needing extra cost.

The present disclosure provides a system on chip, a display terminal and a readable storage medium. The system on chip is applied to the display terminal. The display terminal further comprises a display panel and a backlight module. The system on chip comprises a first data interface, a second data interface, a memory, a central processing unit and a computer program stored in the memory and capable of running on the central processing unit. The central processing unit is connected with the first data interface and the second data interface respectively. When the computer program is executed by the central processing unit, the following steps are implemented: obtaining to-be-displayed data; obtaining backlight matrix data according to the to-be-displayed data; outputting the to-be-displayed data to the display panel through the first data interface and outputting the backlight matrix data to the backlight module through the second data interface.

The invention provides a vehicle anti-theft monitoring method, electronic equipment and a vehicle, which are applied to the technical field of vehicle anti-theft monitoring, when the vehicle is locked, anchor point distances are determined based on all ultra-wide band anchor points at preset intervals, the anchor point distance determined for the first time in all the anchor point distances is determined as an initial anchor point distance, and the initial anchor point distance is determined as an initial anchor point distance; all other anchor point intervals except the initial anchor point interval are determined to be real-time anchor point intervals, when one real-time anchor point interval and the initial anchor point interval meet the preset theft condition, it is indicated that the vehicle posture and / or position represented by the real-time anchor point interval changes obviously at the moment, and then it is indicated that the vehicle may be stolen. At the moment, an alarm is given out to remind a user that the vehicle is likely to be stolen, whether the vehicle is stolen or not can be judged only by determining the distance between the anchor points through the ultra-wide-band anchor points arranged on the existing vehicle, and hardware equipment does not need to be additionally arranged on the vehicle.

The present application relates to the technical field of wireless network optimization, and discloses a kind of based on multi-parameter dynamic adjustment's portable WiFi network switching method and system, a kind of based on multi-parameter dynamic adjustment's portable WiFi network switching method, comprising the following steps: step S1, the incidence factor change rate is calculated;Step S2, the thermal hysteresis compression factor is calculated;Step S3, the historical effective capacity and forward prediction capacity are calculated;Step S4, the service required service rate is calculated;Step S5, the arc segment bias is calculated;Step S6, the final income value is calculated;Step S7, the target network number, switching execution flag and stable maintenance duration are generated.The present application includes the switching decision system with the geometric penetration characteristics of vehicle window and equipment thermal inertia, through the quantitative identification of the asymmetry of serviceable arc segment, completes the comprehensive income evaluation of candidate network and target network selection, reduces meaningless frequent switching action, improves the continuity of cellular backhaul link.

The application discloses a hidden projection equipment driven by translation and lifting, which comprises a projector, a projector driving device and a general driving device for driving the projector driving device to horizontally move and drive the projector to a set position; at the set position, the projector driving device drives the projector to lift; when the projector driving device is driven to horizontally move, the projector driving device also drives a shielding object to move away; the projector driving device is driven to horizontally move and drives the projector to the set position, at the set position, the use and hiding of the projector are realized, the projector can be hidden in structures such as a roof, the shielding object can be driven to move away by using the space difference of horizontal movement, the projector can be hidden in roof decoration, the movable decorative plate unit (including a movable lamp plate) can be perfectly and indistinguishably reset, the integrity and decoration of the roof decoration layer are ensured, and excessive cost is not needed.

The present application relates to the technical field of industrial heat dissipation and fan speed control, and specifically discloses a fan control method and system based on temperature data analysis, aiming to solve the technical problems of channel interference conducted coupling through the power bus under the shared power supply architecture, and the high cost and large layout difficulty of the existing hardware rectification scheme. In the present application, the MCU collects the temperatures of two channel regions according to a preset sampling period, calculates the temperature change rate based on the current and previous three period temperature data and generates a temperature rise mark, collects the FG frequency of each channel and the current PWM duty cycle to calculate the characteristic value, and determines the shared power overload state by the synchronous amplitude reduction of the double-channel characteristic value relative to the historical average value. The PWM increment of each channel is calculated in combination with the temperature rise mark, the power overload mark and the temperature deviation, and the corresponding fan is output after the duty cycle is updated. The present application can realize channel decoupling with zero hardware cost, accurately identify the power state, dynamically allocate power resources, and effectively improve the temperature control precision and operation stability of the heat dissipation system.

The invention discloses a reef explosion method for underwater karst cave geology, which comprises the following steps of: S1, lowering a drilling sleeve, so that the drilling sleeve is in contact with the surface of rock; s2, a drill rod is put down, and the drill rod drills the rock till the set depth is reached; s3, releasing the connection between the drilling machine and the drilling rod; s4, putting a chemical feeding sleeve between the drill rod and the drill hole sleeve; s5, the drill rod is connected with the drilling machine, and the drill rod is lifted; s6, the explosive is put down through the explosive feeding sleeve; and S7, the drilling casing pipe and the chemical feeding casing pipe are lifted, and blasting is carried out. When drilling is completed, connection between the drill rod and the drilling machine is removed, the drill rod serves as a guide rod for lowering of the chemical feeding sleeve, the chemical feeding sleeve can be conveniently inserted into a hole below a karst cave, the drilling sleeve can limit the drill rod, the possibility that the drill rod topples over is avoided, and the drilling diameter of the drill rod is generally larger than the diameter of a drill bit. A certain gap exists between the drill bit and the hole, the chemical feeding sleeve is placed through the gap, and accurate placing of the chemical feeding sleeve can be achieved without increasing cost.

The invention belongs to the technical field of automobile electric power steering, and relates to a method for expanding the angle of a steering wheel based on a TAS vernier median, which comprises the following steps of: 1, calculating a vernier median angle interval division point and measurable left and right limit vernier angles, and initializing an effective flag bit of the angle of the steering wheel to be invalid; 2, calculating a current vernier angle; 3, judging whether the current steering wheel angle flag bit is effective or not; 4, judging whether the vernier angle is within an effective measuring range according to the measurable left and right limit vernier angles and the vernier angle; 5, performing difference value calculation and measuring range correction; 6, entering an angle following mode; according to the invention, the problem that the angle identification is wrong when the vehicle is powered on again due to the fact that the steering wheel is abnormally rotated to exceed the measuring range of the TAS sensor after the vehicle is powered off in the traditional scheme is effectively solved, and the robustness and reliability of the angle measurement of the steering wheel are effectively improved.

The application discloses a laser radar distance aliasing elimination method and device, equipment and storage medium, relates to the technical field of laser radar, and comprises the following steps: emitting a detection signal pulse to a target object, so that a single photon sensing array receives a reflected echo signal pulse of the target object and feeds back; obtaining a plurality of detection distances based on the time of flight principle and the echo signal pulse; and determining the real distance of the target object from the plurality of detection distances according to the position information of the highest response point of the single photon sensing array. By adopting the technical means of combining the rotating mirror scanning structure and the single photon sensing array, the physical characteristics that the reflected light spots of different distance targets are offset in position on the sensing array due to the continuous rotation of the rotating mirror during the flight of the laser are utilized, the position information of the highest response point is taken as the judgment basis, and the distance aliasing problem caused by the time sequence ambiguity of the echo signal and the emission pulse when the single repetition frequency pulse laser radar is used for distance measurement is effectively solved.

The application provides a cache management method and device suitable for a cache containing one or more cache components. The cache management method comprises: receiving a data request from a client, the data request containing a first parameter combination; sending a cache instance metadata inquiry request to a cache access management platform according to the first parameter combination; receiving cache instance metadata returned by the cache access management platform in response to the cache instance metadata inquiry request, the cache instance metadata comprising cache component type information; constructing a cache request according to the cache instance metadata, and obtaining data from the one or more cache components based on the cache request. The cache management method of the application dynamically discovers cache components according to an identifier by means of unified cache access service, shields cache component details, and unifies cache management.

This invention discloses a method and system for optimizing speech recognition under noise based on ultrasonic micro-motion detection. The method includes the following steps: an ultrasonic transmitting module continuously transmits ultrasonic signals; an ultrasonic receiving module continuously receives ultrasonic signals; the received ultrasonic signals are preprocessed to obtain the difference frequency signal of the reflected wave from the moving object; based on the obtained difference frequency signal, whether there is micro-motion within a specific distance is detected; if there is micro-motion, speech is output; otherwise, no speech is output. In this invention, the presence or absence of target speech is indicated by detecting lip micro-movements, which has good noise robustness. It utilizes the built-in speaker and microphone of a smart device to transmit and receive ultrasonic waves to detect lip micro-movements, requiring no additional cost, and has high accuracy and strong practicality, making it suitable for industrial-scale application.

This invention provides a sub-meter-level distributed dual-parameter synchronous sensing system using a hybrid grating array, belonging to the field of fiber optic sensing. It includes: a positive and negative sideband modulation unit for generating linearly swept-frequency probe light with positive and negative sidebands; a tunable chaotic light source unit for generating wavelength-tunable low-coherence chaotic light and modulating it into chaotic light differential pulse pairs with different pulse width differences; a hybrid grating array comprising a series-connected array of identical chirped weak gratings (CFBG) and identical narrowband weak gratings (NFBG); the two beams are amplified and then combined and injected into the hybrid grating array; the CFBG array reflects the linearly swept-frequency probe light in response to vibration; the NFBG array reflects the chaotic light differential pulse pairs in response to temperature; the CFBG and NFBG arrays are completely separated in wavelength division multiplexing. This invention enables sub-meter-level spatial resolution dual-parameter synchronous measurement in a dense grating array without increasing the high-frequency hardware bandwidth.

The invention relates to the technical field of power batteries, and discloses a power battery cell impedance detection method, and the method comprises the steps: obtaining a plurality of current values of each cell and a voltage value corresponding to each current value; dividing a plurality of current value intervals in the value range of the plurality of current values; calculating the number of voltage values corresponding to each current value interval; any two current value intervals form a candidate interval pair, and the evaluation score of the candidate interval pair is determined according to the current values of the candidate interval pair and the number of the corresponding voltage values; determining the candidate interval pair with the highest evaluation score in the at least two pairs of candidate interval pairs of each battery cell as a target current value interval pair of each battery cell; determining the impedance of each battery cell according to the current value of the target current value interval pair of each battery cell and a median voltage value in the corresponding plurality of voltage values; and determining the battery cell with abnormal impedance according to the impedance of each battery cell. In this way, the reliability of the battery cell impedance anomaly detection of the power battery is improved.

This utility model relates to the field of fluid separation technology, and more particularly to a retention chamber for separating mixed gases. The retention chamber has a hollow structure and can be positioned radially distal to the center of rotation of a primary separation device, rotating coaxially and synchronously with the primary separation device, and the two are connected. A Brownian motion suppressor is provided circumferentially inside the retention chamber, which effectively prevents the remixing of different gas components after separation, improving separation efficiency. Simultaneously, the retention chamber has a first end and a second end arranged axially inclined, with the internal space gradually increasing from the first end to the second end. A first exhaust port is located radially proximal to the first end, and a second exhaust port is located radially distal to the second end. This inclined shape allows different gas components to accumulate in different areas, which is beneficial for improving the purity of the separated gas and facilitates disassembly. This retention chamber has a simple overall structure and small size, and can be used to improve various traditional centrifuge devices on the market.

This invention discloses a method and system for detecting defects in valve castings based on image recognition, belonging to the field of image processing technology. The method includes: acquiring a grayscale image of the valve casting; dividing it into continuous windows and linearly fitting the grayscale value sequence within the continuous windows to obtain the trend slope and intercept; determining the trend prediction value for each pixel; and calculating the absolute value of the residual between the actual grayscale value and the predicted value. Pixels with residuals greater than a threshold are selected as candidate pixels; spatially adjacent pixels are divided into connected regions, and contour pixels are extracted. The trend of the region surrounding the contour is re-estimated based on the continuous window radius and lower limit ratio; the residual is calculated based on the search step size and screening factor; and neighboring pixels are located and included to form a defect region. This invention can improve the accuracy of defect identification in valve castings.

The invention discloses a vehicle-mounted millimeter wave radar target size enhancement estimation method based on multipath compensation. The method comprises the steps of identifying whether a current radar detection environment is a multi-path salient scene according to received radar point cloud data, if the current radar detection environment is the multi-path salient scene, obtaining a reflecting surface of the multi-path point cloud data, sequentially extracting a target point cloud and the multi-path point cloud data from the radar point cloud data, and obtaining the target point cloud and the multi-path point cloud data according to the target point cloud and the multi-path point cloud data. Establishing a propagation model according to the geometrical relationship between the multi-path point cloud data and the reflecting surface, mapping the coordinates of the multi-path points to the position of the target body according to the propagation model to form a compensation point cloud, fusing the target point cloud and the compensation point cloud to form an enhanced target point cloud set, and estimating the size of the target based on the enhanced target point cloud set. According to the method, the defect of directly detecting the point cloud is overcome, the multipath interference can be converted into beneficial information, the system robustness is improved, and the method is suitable for an existing vehicle-mounted millimeter wave radar system.

The invention relates to a preparation method of a silver tin oxide composite material added with rare earth oxide. The preparation method comprises the steps of burdening, smelting, water atomization, powder drying, powder screening, powder mixing, powder oxidation, cold isostatic pressing, sintering, extrusion and wire drawing. According to the silver tin oxide composite material prepared by the method, the granularity of the oxide is fine and uniformly distributed, the electrical performance is enhanced, meanwhile, the influence on the processing performance is small, the cost and process loss of the preparation material are not additionally increased, special equipment does not need to be designed, the silver tin oxide composite material is almost universal with existing production equipment, the whole process is environment-friendly, and the method has a good application prospect.

This application provides a method for suppressing inrush current, a parallel system, electronic equipment, and a readable storage medium. The method includes: through a master-slave cooperative control mechanism, the master calculates the global closing point and broadcasts a synchronization command; the parallel system state switches from a conventional parallel operation state to a master-slave cooperative switching state; each slave performs delay compensation based on its own relay parameters; and finally, the EPS relays of multiple machines achieve synchronous closing at the peak point of the inverter output voltage, thereby suppressing the inrush current caused by the EPS port transformer and the circulating current between the inverters. This application's method breaks through the traditional parallel system's synchronous command execution mode, establishing a target synchronization and distributed triggering mode. This application ensures that all EPS relay contacts can achieve high-precision synchronous closing at the voltage peak point.

The application discloses a speech analysis identity authentication method based on sound field reconstruction, which comprises distance sensing, sound field reconstruction, sound field extraction, and model training and inference. The distance sensing is achieved by emitting a chirp signal through a loudspeaker and receiving the signal, and the distance from the user to the mobile phone is obtained by using a cross-correlation method. The sound field reconstruction is achieved by establishing a distance-dependent impulse response database, obtaining the corresponding transfer function according to the measured distance, and then reconstructing the sound field at the verification position to the sound field at the registration position. The sound field extraction is achieved by separately processing the signals of the two sound channels of the speech signal after the sound field reconstruction, and extracting the field texture. The model training and inference are achieved by using the registration field texture and the reconstructed field texture in the verification stage to construct a speech authentication model. The method can effectively solve the problem that the original sound field method is sensitive to distance when verifying the speaker, and the user does not need to maintain a fixed distance during verification as during registration.

This invention discloses a control method for switching a dual-wire energy storage inverter from grid-connected to off-grid operation, comprising the following steps: S1: Detecting abnormal grid conditions and disconnecting the grid-connected relay when an abnormality occurs; S2: Determining whether the absolute value of the filter capacitor voltage exceeds a predetermined threshold and whether the discharge time is less than a predetermined time limit; S3: Selecting a corresponding combination of switching transistors for high-frequency drive based on the polarity of the capacitor voltage to reconstruct the full-bridge circuit into a boost circuit; S4: Calculating the duty cycle of the switching transistors based on the dynamic relationship between the capacitor voltage and the bus voltage, and discharging the capacitor energy to the DC bus through the boost circuit; S5: Resetting the output phase angle of the energy storage inverter to zero and starting off-grid operation. This invention effectively solves the problem of voltage oscillation during off-grid startup of residential dual-wire energy storage inverters under various grid-connected to off-grid operating conditions.

This invention discloses a method for monitoring the cooling flow rate of a hydrogen fuel cell cooling system, belonging to the field of hydrogen fuel cell technology. The method includes: setting the heating power of an electric heater in the hydrogen fuel cell cooling system; detecting the inlet and outlet temperatures of the electric heater to obtain the temperature difference between them; calculating the coolant flow rate through the electric heater using a heat power formula based on the temperature difference; determining the flow rate of each branch of the cooling system by consulting a table showing the ratio of the coolant flow rate through the flow control valve to the flow rate of each branch based on the coolant flow rate and the current flow control valve opening; adjusting the pump speed and flow control valve opening in the hydrogen fuel cell cooling system based on the determined flow rate; and performing fault diagnosis of the hydrogen fuel cell cooling system based on the coolant flow rate through the electric heater and the theoretical flow rate under current operating conditions. This invention enables real-time monitoring of coolant flow rate and is low-cost.

The invention relates to an inverter output power imbalance control method, an inverter and a photovoltaic system, and the method comprises the steps: obtaining the load power of each load based on the inversion power of each phase and the interaction power of each phase and a power grid; determining a power limit value of each phase based on the load power of each load and the anti-countercurrent target value of each phase, and determining a power limit value coefficient of each phase based on the power limit value of each phase; determining an active current value of each phase based on the power limit value coefficient of each phase and an active current reference value which needs to be output to the power grid by the inverter; the current loop reference value of each phase is determined based on the active current value and the reactive current value of each phase, and power compensation is performed on each phase based on the current loop reference value of each phase, so that unbalance control of the power of each phase is realized.

This invention provides a passive regeneration intensity control method based on carbon loading and exhaust characteristics, relating to the field of diesel engine exhaust aftertreatment. The method includes: acquiring upstream data of the diesel particulate filter and obtaining the current carbon loading through a carbon loading model; calculating the passive regeneration intensity in real time based on the reduction rate of the carbon loading model value and establishing a three-dimensional mapping model; acquiring measured emission data of exhaust particulate matter and calibrating a safe threshold for the passive regeneration intensity; calculating the current passive regeneration intensity in real time and obtaining a dynamic safety threshold from a table; and actively adjusting engine combustion parameters to suppress NO2 generation when the passive regeneration intensity exceeds the dynamic safety threshold and the current carbon loading is higher than a set lower limit for carbon loading. This solves the problem in existing technologies of lacking effective control methods for the passive regeneration process of diesel particulate filters, leading to carbon cake collapse, decreased particulate filtration efficiency, and excessive exhaust particulate matter emissions under high-load conditions due to excessively strong passive regeneration.

This invention, within the field of wind turbine technology, discloses a control method for inertial backlash elimination in wind turbine nacelles and a yaw system. The yaw motor circuit is divided into two independently controlled power supply branches: a first drive branch and a second drive branch. After yaw wind alignment, the shutdown sequence of the two yaw motors is precisely controlled to achieve staggered shutdown, utilizing mechanical inertia to eliminate gear meshing backlash. This invention calculates the power-off delay time Δt of the two drive branches based on nacelle inertia, gear backlash, and motor characteristics. According to the direction of the unit's previous yaw action, the electromagnetic brake engagement time is coordinated with the power-off sequence of the two drive branches of the yaw motor to achieve rapid locking after the unit reaches the "backlash elimination" state. This invention, through time-sharing shutdown and inertial backlash elimination, fundamentally improves the stress state at the end of the yaw system, solving problems such as uneven load distribution and uneven force distribution between the drive teeth and bearing teeth.

According to the circulating current suppression and current sharing control method of the UPS parallel system, a self-adaptive state observer and a self-adaptive virtual impedance compensator are embedded in a digital controller of an inverter, and the inverter is controlled according to the following steps that a, output phase current and output voltage signals of the inverter are collected; b, the adaptive state observer identifies a real-time impedance estimation value of an inverter output loop on line; c, assigning the real-time impedance estimation value to the virtual impedance, and calculating the theoretical voltage drop generated by the output current on the virtual impedance; d, generating a voltage reference instruction; e, the voltage reference instruction is sent to a voltage and current double closed-loop PID controller at the rear stage of the inverter, and closed-loop control of the parallel system is completed. According to the invention, accurate perception of line impedance is realized through the adaptive state observer, and a compensated voltage reference instruction is generated through the adaptive virtual impedance compensator, so that the operation efficiency and reliability of the UPS parallel system are greatly improved, and the service life of the UPS parallel system is greatly prolonged.

The application discloses a phased array antenna time-sharing polarization fast switching method based on FPGA software, wherein the FPGA calculates phase data corresponding to two polarizations according to angle instructions and stores the phase data into RAM. A current working polarization is determined according to a master control end level signal, corresponding data is written and a first loading pulse is issued to make the antenna work. After the first loading, phase data of reverse polarization is immediately written to complete presetting; a polarization level signal is monitored, when a jump is detected, a second loading pulse is directly generated by FPGA internal logic, and the preset reverse polarization data is updated to a phase shifter to complete switching. By pre-writing reverse polarization data in a switching gap, only loading pulse updating operation is needed during polarization switching, SPI data writing is not needed, polarization switching time is shortened, switching dead time is significantly reduced, dual-polarization imaging resolution and target tracking stability are improved, and no additional hardware cost is needed.