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Method for online quantitative-diagnosing battery micro-short-circuit fault
ActiveCN108152755ASensitive to micro-short circuit faultsReliable diagnosisElectrical testingVehicular energy storageEngineeringCharge discharge
The invention relates to a method for online quantitative-diagnosing a battery micro-short-circuit fault. The method comprises the following steps: pre-establishing a relation table of electric quantity and a charging-discharging voltage, and storing; in an online diagnostic process, performing table lookup or interpolation in the relation table on the voltage while the charge / discharge is over, to obtain the electric quantity of a battery while the charge / discharge is over, thereby estimating a micro-short-circuit current according to the change of the electric quantity along with the time, and judging whether a micro-short-circuit is existent and the severity degree according to the size of the micro-short-circuit current. In allusion to end conditions of a battery pack, such as fully charged, fully discharged, non-fully charged, and non-fully discharged, corresponding diagnostic methods are provided for forming an all-around diagnosis framework. In order to solve problems that the battery is aged and the diagnosis accuracy degree and the calculation precision of the micro-short-circuit current can be affected because the environment temperatures in the different times of the charging and discharging are different, a compensated solution scheme is implemented. The method for the micro-short-circuit current is capable of detecting the micro-short-circuit fault in advance, andoutputting the size of the micro-short-circuit current so as to estimate the severity degree of the fault, and providing the basis for measures, such as warning or answering.
Owner:UNIV OF SHANGHAI FOR SCI & TECH
Method for judging whether continuous phase changing of direct-current system fails on basis of short-circuit ratio dynamic tracking
ActiveCN103887810AAchieving Single Fault SequencingQuick buildElectric power transfer ac networkTransient statePower grid
The invention provides a method for judging whether continuous phase changing of a direct-current system fails on basis of short-circuit ratio dynamic tracking. The method includes the following steps of calculating the ESCR and the MSCR i of an alternating-current system under the condition that the alternating-current system operates normally, calculating the ESCR and the MSCR i of the alternating-current system under the condition that line faults occur and power is cut off, sequencing the line faults, combining the poorest interlocking fault sets, calculating the ESCR 1 and MSCR 1 of the alternating-current system on the condition of interlocking faults, and judging whether phase changing fails. By means of the method, feature analysis is carried out on transient voltage instability accidents which probably exist in existing and planned alternating-current and direct-current hybrid power grids, fault screening and sequencing can be effectively carried out according to hazard degrees of alternating-current faults to stable operation of the direct-current system, by combination of the current transfer situation after the faults, the interlocking fault sets are reasonably built, and failures of continuous phase changing of the direct-current system and received-end power grid voltage instability risks after the faults can be quickly evaluated.
Owner:STATE GRID CORP OF CHINA +2
Decoupling control method of non - square matrix system in industrial process
InactiveCN101004591ASimple control structureLarge Robust Stability DomainAdaptive controlMinimum phaseInternal mode
A decoupling-control method of non-square system in industrial process includes modifying internal model control structure to add a one order filter in feedback loop of system out for increasing robust stability of system, using relevant function means of pair non-square course to derive internal mode controller, eliminating unstable factor in said controller by adding compensation item and approximating finally obtained internal model controller to be low order controller being realized easily.
Owner:SHANGHAI JIAO TONG UNIV
Model-free weight controlling method for injection molding product
InactiveCN102101352AImprove the efficiency of weight controlReduce dependenceInjection mouldingComputer science
The invention discloses a model-free weight controlling method for an injection molding product. In order to solve the problems of frequent operation parameter variation, difficult process modeling and finite model precision and the like during injection molding production, model-free quick product weight control is realized by using the characteristics of low cost and repeated batches of the injection molding production. The method is favorable for reducing the test expenses of a product weight control process and shortening the control time; moreover, the method has significance for improving the weight control efficiency during injection molding and achieving the effects of energy saving and emission reduction during injection molding industrial production.
Owner:ZHEJIANG UNIV
Online identification and visualization method for power grid disturbances based on multi-resolution wavelet analysis
ActiveCN102931728AReality matchThe analysis result is accurateCircuit arrangementsInformation technology support systemWide areaMulti resolution analysis
The invention relates to an online identification and visualization method for power grid disturbances based on multi-resolution wavelet analysis, which belongs to the technical field of wide-area dynamic monitoring and visualization of power systems. The method comprises the following steps: carrying out offline simulation analysis on the features of typical dynamic disturbance accidents in power grid, and selecting a wavelet function Psi and the decomposition layer-number I corresponding to the obtained maximum wavelet coefficient energy as online wavelet multi-resolution analysis tools; carrying out regionalization according to the PMU (power management unit) configuration situation of a target power grid, so that each region has one and only one PMU substation for measurement, and transmitting frequency signals measured by each PMU substation to a WAMS (wide area measurement system) master station; acquiring frequency signals of each PMU substation from the WAMS master station, and carrying out I-layer online wavelet multi-resolution analysis on the frequency signals by using the determined wavelet function so as to obtain wavelet coefficients of an I(th) layer; and discriminating disturbance occurrence time, disturbance occurrence potion and disturbance type according to the wavelet coefficients; and carrying out visualized display through taking a map as the background. The method disclosed by the invention can improve the running reliability of an electrical power grid.
Owner:TSINGHUA UNIV +1
Method for extracting motor imagery electroencephalogram characteristics on condition of few channels
ActiveCN103340624AOvercome the shortage of limited quantitySmall amount of calculationDiagnostic recording/measuringSensorsFrequency characteristicMotor imagery
The invention provides a method for extracting motor imagery electroencephalogram characteristics on the condition of few channels. According to the method, multiple coordinate delays of each channel time sequence are utilized for simultaneously optimizing a spatial filter and a high-order multi-parameter FIR filter; a non-parametric method is used for evaluating characteristic quantity and information entropy between categories so as to select time coordinate delays in the optimal number; the high-order FIR filter based on the multiple time coordinate delays has a better amplitude-frequency characteristic compared with an FIR filter with one parameter. The method provides an effective way for extracting categorical features of motor imagery on the condition of few channels.
Owner:上海念通智能科技有限公司
Uncoupling control method for double-inputting and double-outputting system
InactiveCN1932699AEasy to implementEasy to implement onlineAdaptive controlLoop controlDecoupling controller
An industrial process control technology field two-input-output system's decoupling control method, it lets the reverse decoupling structure's decoupling machine and the controller into one decoupling control machine, and it forms the unit feedback control structure. By adding the compensation item, it can eliminate decoupling controller machine's unstable factors. It designs the decoupling controller machine's sub-controller base on the inner module theory, then the final decoupling control machine is almost the easy implement PID / PI controller. When has the actual operating control, the first is deduce the controller parameter's lowest borders which can meet the LuBang stability condition. Then on the base of this border minimum, separately enlarge every loop's control parameter monotonously until gain the system mark capability which complies with the project's requirements. The control method structure of this invention is simple and easy to achieve, and has wide applicability and is easy to operate, it can quickly accurate tuning control parameters and makes the closed loop control system meet the LuBang stability requirement.
Owner:SHANGHAI JIAO TONG UNIV
Method and correlated device for confirming optimum object plane and optimum image plane of photo-etching projection device
ActiveCN101174104AGood surfaceGood locationPhotomechanical exposure apparatusMicrolithography exposure apparatusImage resolutionRange of motion
The invention discloses a method for determining the optimal object plane and the optimal image surface of a photoetching projecting device, and the relevant device thereof. The invention utilizes a two-dimensional exposure method, namely, the stepping of a mask and a wafer in a certain range is controlled to obtain a group of exposure markers corresponding to the different object plane and optimal image positions on the wafer, the resolution ratio of the groups of exposure markers is compared to determine the position of the optimal object plane and image surface. Compared with the prior art, the precision of the optimal object plane and the optimal image surface obtained by the method is higher, and the cost problem brought in order to provide the high precision in the prior art is solved.
Owner:SHANGHAI MICRO ELECTRONICS EQUIP (GRP) CO LTD
Online dynamic forecast method for polypropylene fusion index
ActiveCN102663220ARealize online dynamic forecastImprove technical levelSpecial data processing applicationsHydrogenComputer configuration
The invention discloses an online dynamic forecast method for polypropylene fusion index. The method comprises the steps of starting a prepared fusion index online forecast program through clicking a button on an industrial control computer configuration interface, and, based on a dynamic forecast mathematical model for the whole flow process polypropylene fusion index and in combination with the fading memory augmentation least square method, realizing the online forecast of the polypropylene fusion index. The most important characteristic of the method is that in the state of continuous production of a polymerisation device by online measurement and calculation of the input flow-rate ratio of hydrogen and propylene and polymerization temperature, the fusion index of polypropylene resin can be online forecasted in a very wide range, so the method has the advantages of being simple and effective, easy to implement and low in cost. Through use of the method, detection frequency and efficiency of critical quality of polypropylene are greatly improved, discharging of unqualified products can be reduced and production and economic efficiency and market competitiveness can be increased.
Owner:平湖乾丰机械有限公司
Novel control system and method for auxiliary inverter of rail transit
Disclosed is a novel control system and method for an auxiliary inverter of rail transit. The system comprises an output-voltage instantaneous value feedback module, a filter capacitor voltage feedforward module and a diode front busbar voltage differential feedforward module. The control method includes: firstly, controlling an effective value of output voltage to be stabilized through the output-voltage instantaneous value feedback module; secondly, inhibiting influence on output voltage due to busbar voltage fluctuation through the filter capacitor voltage feedforward module; thirdly, increasing dynamic response speed of the filter capacitor voltage feedforward module through the diode front busbar voltage differential feedforward module; fourthly, summing a feedback modulation ratio ao, a feedforward modulation ratio adc and a differential feedforward modulation ratio ad respectively outputted by the output-voltage instantaneous value feedback module, the filter capacitor voltage feedforward module and the diode front busbar voltage differential feedforward module to obtain a total modulation ratio. Based on multi-compound differential feedforward, resistance of the auxiliary inverter to busbar voltage change is improved, and stability and reliability in output voltage of the auxiliary inverter are guaranteed.
Owner:XI AN JIAOTONG UNIV
Intelligent network connection vehicle preceding vehicle acceleration prediction method based on Gaussian process regression
ActiveCN109978025ASolve the problem of unpredictable accelerationMethod with few parametersForecastingCharacter and pattern recognitionIntelligent NetworkComputer science
The invention discloses an intelligent network connection vehicle preceding vehicle acceleration prediction method based on Gaussian process regression. The method comprises: selecting data of n historical moments at the current moment as input of a training set, the accelerations at n historical moments of the preceding vehicle measured at the current moment are taken as the output of a trainingset; predicting preceding vehicle accelerations at n future moments through Gaussian process regression; then, an iteration method is utilized; at the next moment, the acceleration values of n new historical moments of the preceding vehicle are measured again, the preceding vehicle acceleration of n new moments in the future is predicted through Gaussian process regression, the first prediction value is taken as the prediction reference value of the next moment, and the steps are repeated so that the value of the preceding vehicle acceleration can be predicted online, and the prediction deviation can be continuously corrected. The method is less in parameter setting, simple in design, easy to understand, simple and convenient to implement online and high in practicability, the prediction deviation can be continuously corrected while the acceleration value of the preceding vehicle is predicted online, and the problem that the acceleration of the preceding vehicle is difficult to predictis solved.
Owner:ZHEJIANG UNIV OF TECH
Active anti-carsickness assistant driving control method of autonomous vehicle
ActiveCN108639061AAcceleration curve increasesSmooth acceleration curveControl devicesEngineeringMATLAB
The invention provides an active anti-carsickness assistant driving control method of an autonomous vehicle. To solve the problem that passengers of the autonomous vehicle are easy to get carsick, thetaking comfort of the autonomous vehicle is improved to prevent a phenomenon that the passengers get carsick; by establishing an optimization control problem with carsickness prevention as an evaluation index, calculating a feasible interval of a command accelerated speed on line, calculating an accelerated speed optimal value by using a MatLab command function fmincon and dynamically calculatingan accelerated speed command which meets active carsickness prevention, the active anti-carsickness assistant driving control of the autonomous vehicle is realized. The active anti-carsickness assistant driving control method of the autonomous vehicle has the advantages of less design parameters, simple design, easy understanding, simple and convenient online implementation and high practicability.
Owner:ZHEJIANG UNIV OF TECH
Turntable servo system self-adaptive identification method based on identification error limitation
PendingCN111506996AAdjust filter effects in real timeEffective filtering capabilityDesign optimisation/simulationCAD numerical modellingAdaptive filterAdaptive identification
The invention discloses a turntable servo system identification method based on an identification error limitation technology. The method comprises the steps: acquiring a dynamic identification modelof the motor servo system by using a discretization method; acquiring a regression identification model of a servo system according to a discretization method, providing a self-adaptive filter designed based on filtering variable difference information, denoising collected system data, establishing a variable gain attenuation factor to improve the data saturation phenomenon, and designing an intermediate variable and a filtering variable to construct identification error information; applying a constraint condition to the identification error by using a specified performance technology, so theidentification error is limited in a certain interval, and excessive overshoot is avoided; an error conversion technology is adopted to convert a constrained identification error problem into a general identification error design problem, and transient performance realization is ensured based on identification error information and an improved correction gain design parameter adaptive law. Finally, the effectiveness and the usefulness of a turntable servo system identification method based on the identification error limitation technology are verified by utilizing an actual experiment platform.
Owner:ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
Plane profile trajectory tracking control method
ActiveCN104375458ARealize synchronous coordination tracking controlSimple designNumerical controlNumerical controlState space
The invention discloses a plane profile trajectory tracking control method. The plane profile trajectory tracking control method comprises the steps that based on a plane profile trajectory tracking control state space mathematic model, a full-state feedback tracking controller is designed by solving a Riccati matrix equation, the input voltage of an X-axis motor and the input voltage of a Y-axis motor of a numerical control machine tool are then calculated, and the high-speed and high-precision stabilized tracking control over plane profile trajectory position functions sX and sY by the numerical control machine tool is achieved. The plane profile trajectory tracking control method has the advantages that the profile trajectory controller is designed by directly adopting the double-axis tracking control state space model, and the synchronous coordinate tracking control over the two spindle motors is achieved; the tracking controller only has one adjusting parameter, and thus online implement is easy, convenient and reliable.
Owner:ZHEJIANG UNIV OF TECH
Lithium-ion battery pack external short circuit fault diagnostic method based on two-stage model prediction
ActiveCN109738811ASimple stepsEasy to implement onlineElectrical testingElectrical batteryElectric vehicle
The invention provides a lithium-ion battery pack external short circuit fault diagnostic method based on two-stage model prediction, and relates to the technical field of lithium-ion power battery safety. Firstly, an external short circuit experiment is conducted on a lithium-ion battery pack, a battery pack external short circuit two-stage equivalent circuit model is constructed, tested experiment data are used, and thus optimality identification is conducted on battery model parameters; then the battery state in the battery pack is judged in operation according to battery measuring data, when abnormality of part battery voltage occurs, adjacent battery units of the battery unit with abnormality are marked as a whole and are written as an abnormal battery pack, a first stage battery model is started, if the error of the first stage battery model is less than a critical threshold value, then a second stage battery model is started, and model errors are calculated to obtain; and finally, fault diagnosis is conducted on the abnormal battery through goodness fit of the measured data and the two-stage model. The lithium-ion battery pack external short circuit fault diagnostic method is simple in step, easy to achieve on line, high in reliability and is suitable for on-line fault diagnosis and safe management of the electric vehicle power battery.
Owner:NORTHEASTERN UNIV
Method for evaluating weak voltage area of direct-current receiving end alternative-current system based on dynamic tracking
InactiveCN106786564AQuick buildAchieving Single Fault SequencingResourcesAc network circuit arrangementsWide areaOperation mode
The invention discloses a method for evaluating a weak voltage area of a direct-current receiving end alternative-current system based on dynamic tracking. The method comprises the following steps: 1, based on a WAMS (Wide Area Measurement System), extracting and counting voltage fluctuation waveforms of recent abnormal fluctuation information, confirming a frequent voltage fluctuation area, and calculating a voltage abnormal fluctuation level coefficient C1 of the area; 2, in a normal operation mode, calculating a voltage stability level coefficient C2 of a direct-current receiving end system; 3, calculating a voltage stability level coefficient C3 of the direct-current receiving end under the condition of line fault disconnection; 4, sequencing line faults; 5, integrating C1, C2 and C3 to form a superposition equation, and providing voltage stability grade levels R=C1 / (C2+C3) of different sub-areas, and determining that a sub-area is a dangerous area if R is greater than or equal to 0 and less than or equal to 0.03, and the sub-area is a common dangerous area if R is greater than or equal to 0.03 and less than or equal to 0.5, and the sub-area is an area with relatively small danger if R is greater than or equal to 0.5. By adopting the method, danger grade classification of weak voltage stability level areas can be achieved, voltage unstability risk areas of a direct-current receiving end power grid after faults can be rapidly evaluated, good practicability can be achieved, the workload can be small, and various hidden fault problems can be processed.
Owner:STATE GRID HENAN ELECTRIC POWER +1
Method and device for air-fuel ratio tracking control over hay mower gasoline engine
ActiveCN103742276AIncreased level of controlEmission reductionElectrical controlProgramme-controlFeedback controllerMathematical model
The invention discloses a method and device for air-fuel ratio tracking control over a hay mower gasoline engine. Based on a hay mower gasoline engine air-fuel ratio dynamic disturbance mathematic model, the variable of integration of air-fuel ratio tracking deviation signals is adopted, and an air-fuel ratio disturbance expansion mathematic model is formed; combined with a state feedback controller and the pole assignment technology, a controller of air-fuel ratio tracking object set values is designed. The method and device have the advantages that within a wide range of rotation speed and air inlet temperature changing of the gasoline engine, precise tracking control over the engine air-fuel ratio can be achieved, the air-fuel ratio is kept at the theoretical target value as far as possible in steady and transient operation of the gasoline engine, the fuel efficiency is improved, emission of CO, NOX and other harmful gases is reduced, and the control level over operation of the gasoline engine system is greatly improved.
Owner:NINGBO AOSHENG MACHINE
Physical layer security resource allocation method in ICV network
ActiveCN112153744AIncrease confidentiality capacityRealize automatic spectrum accessParticular environment based servicesVehicle-to-vehicle communicationInterference (communication)Transmitted power
Owner:HARBIN INST OF TECH
Method and device for protecting silicon wafer edge
ActiveCN102012639BHigh precisionEasy to implement onlinePhotomechanical exposure apparatusMicrolithography exposure apparatusEngineeringCam
The present invention provides method and device for protecting silicon wafer edge, wherein the method comprises the following steps: placing a protection ring on a working bench by a device for protecting silicon wafer; protecting the silicon wafer edge by the protection ring during exposure of the silicon wafer; performing said flows again after replacing a new silicon wafer, wherein the centre of the protection ring is a hollow part, and the edge thereof is an entity part; the protection ring prevents the silicon wafer edge from exposing during exposure. The method for protecting silicon wafer edge comprises a position adjusting mechanism, a Z-direction lifting gear, three eccentric linkage overload protection cam-reciprocating pneumatic swing-cylinder connecting rod mechanisms, a blowing mechanism, a detection mechanism, a speed control module, and a pneumatic control module. In the method and device for protecting silicon wafer edge of the present invention, the method is that negative glue exposure and the edge protection are performed synchronously; when the silicon wafer is exposed, the silicon wafer edge is protected without a second process for processing the silicon wafer edge; the processes are reduced, and working efficiency is improved.
Owner:SHANGHAI MICRO ELECTRONICS EQUIP (GRP) CO LTD
Neural network prediction and control method for water turbidity in medicine automatic cleaning process of traditional Chinese medicine decoction pieces
ActiveCN109557812ASimple designEasy to understandCleaning using liquidsAdaptive controlLevenberg–Marquardt algorithmAutomatic control
The invention provides a neural network prediction and control method for the water turbidity in the medicine automatic cleaning process of traditional Chinese medicine decoction pieces. For the problem that the water pressure in the medicine automatic cleaning process of the traditional Chinese medicine decoction pieces cannot be adjusted according to the actual amount of the cleaning medicine and the amount of sand, a Levenberg-Marquardt algorithm is used to train a neural network prediction model of turbidity of the overflowing water and the water pressure of the cleaning pump in the medicine automatic cleaning process of the traditional Chinese medicine decoction pieces. A cumulative function of a water turbidity tracking deviation and the water pressure change amount of the pump overa period of time in the future is minimized by a differential evolution algorithm. The water pressure of the pump in the medicine automatic cleaning process of the traditional Chinese medicine decoction pieces is calculated in real-time. The optimization and automatic control of a water turbidity tracking set value in the in the medicine automatic cleaning process of the traditional Chinese medicine decoction pieces is realized. The invention provides the neural network prediction and control method for the water turbidity in the medicine automatic cleaning process of the traditional Chinese medicine decoction pieces which is intuitive in understanding, simple in design, and prone to implement.
Owner:ZHEJIANG UNIV OF TECH
Online identification and visualization method for power grid disturbances based on multi-resolution wavelet analysis
ActiveCN102931728BReality matchThe analysis result is accurateCircuit arrangementsInformation technology support systemWide areaMulti resolution analysis
The invention relates to an online identification and visualization method for power grid disturbances based on multi-resolution wavelet analysis, which belongs to the technical field of wide-area dynamic monitoring and visualization of power systems. The method comprises the following steps: carrying out offline simulation analysis on the features of typical dynamic disturbance accidents in power grid, and selecting a wavelet function Psi and the decomposition layer-number I corresponding to the obtained maximum wavelet coefficient energy as online wavelet multi-resolution analysis tools; carrying out regionalization according to the PMU (power management unit) configuration situation of a target power grid, so that each region has one and only one PMU substation for measurement, and transmitting frequency signals measured by each PMU substation to a WAMS (wide area measurement system) master station; acquiring frequency signals of each PMU substation from the WAMS master station, and carrying out I-layer online wavelet multi-resolution analysis on the frequency signals by using the determined wavelet function so as to obtain wavelet coefficients of an I(th) layer; and discriminating disturbance occurrence time, disturbance occurrence potion and disturbance type according to the wavelet coefficients; and carrying out visualized display through taking a map as the background. The method disclosed by the invention can improve the running reliability of an electrical power grid.
Owner:TSINGHUA UNIV +1
Open-circuit fault diagnosis method for neutral-point clamped single-phase three-level inverter
ActiveCN112526397ANot affected by fault diagnosis resultsReliable Fault DiagnosisContinuity testingPhotovoltaic energy generationSingle phaseOnline computation
The invention discloses an open-circuit fault diagnosis method for a neutral-point clamped single-phase three-level inverter. The method comprises the following steps of: obtaining neutral-point clamping bus current information by changing a detection mode of a current sensor, and obtaining a corresponding relationship among a switching state of two bridge arms under a normal condition, a phase current and a theoretical current value detected by the current sensor through off-line calculation; establishing a corresponding relation between a current sensor detection current actual value and different power tube open-circuit fault conditions when the phase current has different polarities, and setting a fault diagnosis rule according to the change of the current sensor detection value in thecorresponding relation; and carrying out the open-circuit fault diagnosis of the single-phase three-level inverter by comparing the change relationship between the theoretical current value detectedby the current sensor and the actual value acquired on line and combining a fault diagnosis rule. The method provided by the invention is independent of an adopted control strategy, is simple to implement, does not need a complex online calculation process, is accurate in open-circuit fault diagnosis, and has a good engineering application value.
Owner:CHINA UNIV OF MINING & TECH
An Anti-disturbance Tracking Control Method for Plane Contour Trajectory
ActiveCN104503227BRealize synchronous coordination tracking controlImprove profile accuracyAdaptive controlMathematical modelState space
The invention discloses a planar profile track disturbance-rejection tracking control method. According to the method, a planar profile track tracking control state space disturbance mathematics model is taken as a base, integration variables of a tracking position signal are introduced to establish a state space disturbance expansion mathematics model, a controller gain matrix is calculated through a Malab function place, a state feedback disturbance-rejection tracking controller is designed, input voltages of X-axis and Y-axis motors of a numerically-controlled machine tool are calculated, and high-speed high-precision disturbance-rejection tracking control on planar profile track position functions sX and sY is realized through the numerically-controlled machine tool. The method is advantaged in that the profile track controller is designed by directly employing the dual-axis tracking control state space disturbance mathematics model, and synchronous coordination tracking control of the two main shaft motors is realized; the tracking controller only has two adjustment parameters, and on-line construction is simple and reliable.
Owner:ZHEJIANG UNIV OF TECH
Air-fuel ratio tracking control method and device for lawnmower gasoline engine
ActiveCN103742276BIncreased level of controlEmission reductionElectrical controlProgramme-controlFeedback controllerMathematical model
The invention discloses a method and device for air-fuel ratio tracking control over a hay mower gasoline engine. Based on a hay mower gasoline engine air-fuel ratio dynamic disturbance mathematic model, the variable of integration of air-fuel ratio tracking deviation signals is adopted, and an air-fuel ratio disturbance expansion mathematic model is formed; combined with a state feedback controller and the pole assignment technology, a controller of air-fuel ratio tracking object set values is designed. The method and device have the advantages that within a wide range of rotation speed and air inlet temperature changing of the gasoline engine, precise tracking control over the engine air-fuel ratio can be achieved, the air-fuel ratio is kept at the theoretical target value as far as possible in steady and transient operation of the gasoline engine, the fuel efficiency is improved, emission of CO, NOX and other harmful gases is reduced, and the control level over operation of the gasoline engine system is greatly improved.
Owner:NINGBO AOSHENG MACHINE
Model-free control method for focal distance of injection molded plastic lens
InactiveCN102079125AIncreased efficiency of focus controlReduce dependenceOptical articlesInjection mouldingEnergy conservation
The invention discloses a model-free control method for the focal distance of an injection molded plastic lens. According to the invention, aiming at the problems such as frequent change of operation parameters, difficulty of process modeling, limited model precision and the like existing in the focal distance control process of the injection molded plastic lens, the model-free control method forthe focal distance of the injection molded plastic lens is designed according to the characteristics of the injection molded plastic lens that the cost in the production process is low and the batch can be repeated, thus the control on the focal distance of the plastic lens is realized. By utilizing the control method, the control overhead can be reduced, and the control time is shortened, thereby improving the focal distance control efficiency, and being beneficial to the energy conservation and emission reduction in the production process of injection molded lenses.
Owner:ZHEJIANG UNIV
Online optimization calmness control method for wheel type movable stage robot
ActiveCN107168064AMeet the real-time requirements of fast controlSimple designAdaptive controlDynamic modelsTime limit
An online optimization calmness control method for a wheel type movable stage robot aims at a requirement for realizing calmness controlling of the wheel type movable stage robot in a non-complete restraining condition. Firstly, through defining a discrete time three-order dynamics model of the wheel type movable stage robot and a randomly selected initial time limited time window control sequence, a calmness control error sequence in a time window and gradient of the error sequence relative to a controlled input sequence are calculated. Then a Newton's method is utilized for establishing an updating mechanism for each sampling time control sequence. Furthermore according to a rolling optimization control principle, a controlled input amount at each sampling time point is calculated, thereby realizing calmness controlling to the wheel type movable stage robot. The online optimization calmness control method according to the invention has advantages of easy understanding, small number of setting parameters, high versatility and simple online calculation. Furthermore the online optimization calmness control method satisfies a requirement for high real-time performance in quick calmness controlling of the wheel type movable stage robot.
Owner:ZHEJIANG UNIV OF TECH
Planar profile track disturbance-rejection tracking control method
ActiveCN104503227AHigh-speed anti-disturbance tracking controlRealize synchronous coordination tracking controlAdaptive controlState spaceMachine tool
The invention discloses a planar profile track disturbance-rejection tracking control method. According to the method, a planar profile track tracking control state space disturbance mathematics model is taken as a base, integration variables of a tracking position signal are introduced to establish a state space disturbance expansion mathematics model, a controller gain matrix is calculated through a Malab function place, a state feedback disturbance-rejection tracking controller is designed, input voltages of X-axis and Y-axis motors of a numerically-controlled machine tool are calculated, and high-speed high-precision disturbance-rejection tracking control on planar profile track position functions sX and sY is realized through the numerically-controlled machine tool. The method is advantaged in that the profile track controller is designed by directly employing the dual-axis tracking control state space disturbance mathematics model, and synchronous coordination tracking control of the two main shaft motors is realized; the tracking controller only has two adjustment parameters, and on-line construction is simple and reliable.
Owner:ZHEJIANG UNIV OF TECH
Intelligent fault diagnosis method of aero-engine control system sensor based on mode gradient spectral entropy
PendingCN112881017ARobustImprove featuresEngine testingElectric testing/monitoringData setControl system
The invention provides an intelligent fault diagnosis method of an aero-engine control system sensor based on a mode gradient spectral entropy, and the method comprises the steps: firstly collecting data of a plurality of measurable sensors in an aero-engine control system in different working states, a normal state and different fault states of the sensor of an aero-engine, and forming a sample data set; preprocessing collected sensor data, and processing preprocessed sample data of each health state through a mode gradient spectral entropy method to obtain a corresponding spectral entropy graph; taking the spectral entropy graph as input to train a CNN network; and after the trained CNN model is obtained, carrying out preprocessing and PGSE analysis on real-time measurement data of the aero-engine control system sensor to obtain a spectral entropy graph, and obtaining a sensor fault diagnosis result by using the CNN model. According to the method, the sensor fault diagnosis accuracy can be improved, the fault mode of a complex nonlinear aero-engine system can be efficiently and accurately recognized, the robustness requirement is met, and the method is not sensitive to noise interference.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
On-line Quantitative Diagnosis Method of Micro-short-circuit Fault of Battery
ActiveCN108152755BReliable diagnosisReduce data volumeElectric devicesElectrical testingBattery degradationElectrical battery
Owner:UNIV OF SHANGHAI FOR SCI & TECH
Online dynamic forecast method for polypropylene fusion index
ActiveCN102663220BRealize online dynamic forecastImprove technical levelSpecial data processing applicationsHydrogenComputer configuration
The invention discloses an online dynamic forecast method for polypropylene fusion index. The method comprises the steps of starting a prepared fusion index online forecast program through clicking a button on an industrial control computer configuration interface, and, based on a dynamic forecast mathematical model for the whole flow process polypropylene fusion index and in combination with the fading memory augmentation least square method, realizing the online forecast of the polypropylene fusion index. The most important characteristic of the method is that in the state of continuous production of a polymerisation device by online measurement and calculation of the input flow-rate ratio of hydrogen and propylene and polymerization temperature, the fusion index of polypropylene resin can be online forecasted in a very wide range, so the method has the advantages of being simple and effective, easy to implement and low in cost. Through use of the method, detection frequency and efficiency of critical quality of polypropylene are greatly improved, discharging of unqualified products can be reduced and production and economic efficiency and market competitiveness can be increased.
Owner:PINGHU QIANFENG MASCH CO LTD
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