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712results about How to "Improve dynamic response performance" patented technology
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Complex environment radar multi-target tracking and road driving environment prediction method
ActiveCN110596694AImprove recognition accuracyImprove dynamic response performanceRadio wave reradiation/reflectionObject tracking algorithmValue noise
The invention belongs to the technical field of intelligent automobiles, specifically relates to a complex environment radar multi-target tracking and road driving environment prediction method, whichparticularly aims to solve the problems that the position relationship identification of a lane where a target vehicle locates is inaccurate and the robustness and precision of a target tracking algorithm are not high through determination based on a radar original target measurement value in the process that a vehicle having a self-adaptive control function drives in a curve or an intelligent vehicle having an autonomous valet parking function enters and exits from a curved ramp of an underground parking lot. The complex environment radar multi-target tracking and road driving environment prediction method is mainly implemented by present vehicle motion state estimation, millimeter wave radar signal conversion, time synchronization, target motion compensation, data rationality judgment,target measurement value noise reduction, road curvature estimation, target aggregation, target motion attribute and motion state identification, improved adaptive extended Kalman filtering algorithmtracking and data association, road driving environment prediction and key target generation.
Owner:中汽研软件测评(天津)有限公司
Multifunctional digitized welding machine
InactiveCN102350569ABeautiful shapeImprove dynamic response performanceArc welding apparatusFull bridgeTransformer
The invention relates to a multifunctional digitized welding machine, which comprises a full-bridge type inversion main circuit, a control circuit and a soft switch PWM (Pulse-Width Modulation) driving circuit, wherein the full-bridge type inversion main circuit is composed of an IGBT (Insulated Gate Bipolar Translator); the soft switch PWM driving circuit of a symmetric carrier is based on a CPLD (Complex Programmable Logic Device) or FPGA (Field Programmable Gate Array); the inversion main circuit comprises a rectifying filtering module, an IGBT full-bridge inversion module, a main transformer and a secondary rectifying filtering module; the control circuit comprises a DSP (Digital Signal Processor) control processor, a manual idle-dropping circuit, a regulating, detecting and sampling circuit for a feedback current and voltage signal outputted by the welding machine, a collecting and setting circuit for a feeding speed and given voltage of the welding machine, a display circuit for an interface and parameter of an external keyboard and a communication circuit connected to a PC (Personal Computer); the regulating, detecting and sampling circuit for the feedback current and voltage signal outputted by the welding machine comprises a Hall voltage sensor for detecting a feedback arc voltage outputted by the welding machine and a Hall current sensor for detecting an output current of the welding machine; and the collecting and setting circuit for the feeding speed and given voltage of the welding machine comprises a collecting circuit for a given voltage and given current, namely the feeding speed, on a panel of a feeder.
Owner:PANDA ELECTRONICS GROUP +2
Linear servo motor control method for numerically-controlled machine tool driving
InactiveCN103532459AReduce switching lossesImprove dynamic responsivenessElectronic commutation motor controlAC motor controlAnti jammingControl vector
The invention discloses a linear servo motor control method for numerically-controlled machine tool driving. According to the method, a sine wave linear motor is controlled through a feedback signal detection module, a position control ring, a speed control ring and a current control ring, and the feedback signal detection module comprises a position detection module, a speed detection module and a current detection module, wherein the position control ring adopts a composite control method combining PI (proportional-integral) feedback control and neural network given compensation control, the speed control ring adopts a fuzzy controller with a disturbance observer, and the current control ring adopts a space vector PWM (pulse-width modulation) technology with a PI regulator. The linear servo motor control method has the advantages that the neural network compensation PI control technology, the fuzzy control and the alternating current motor vector control are combined, and the anti-jamming capability, the dynamic response capability and the system stable state precision of a linear servo motor are improved.
Owner:SOUTHEAST UNIV
Rotor punching structure for permanent-magnet servo motor
ActiveCN104882981AImprove back EMF waveformReduce additional stray lossMagnetic circuit rotating partsPunchingCoupling
The invention provides a rotor punching structure for a permanent-magnet servo motor, and the structure comprises a rotor punching body. The peripheral surface of the rotor punching body is provided with permanent magnet tanks, and the interior of each permanent magnet tank is provided with a permanent magnet in an embedded manner. The external circle of the rotor punching body above the permanent magnet tanks is not concentric with the internal circle of a stator. The rotor punching body above the permanent magnet tanks is provided with magnetic isolation holes which are arranged horizontally, and the rotor punching body below the permanent magnet tanks is provided with an axial cooling channel. The permanent magnet tanks are radially arranged in a layered manner, and magnetic isolation tanks are respectively disposed between the adjacent permanent magnet tanks. Magnetic isolation bridges are disposed among the magnetic isolation tanks and the permanent magnet tanks. Through the improvement of the rotor punching structure and the control of the direction of a magnetic field, the nonlinear impact, caused by the coupling of quadrature-axis and direct-axis magnetic circuits, on motor parameters is reduced, and the space of a rotor punching is used fully for placing permanent magnets as many as possible. Moreover, the capability of resistance to demagnetizing and the overbearing capability of the permanent-magnet servo motor are improved, and the operation performance of the permanent-magnet servo motor is effectively improved.
Owner:SHANGHAI MOTOR SYST ENERGY SAVING ENG TECH RES CENT +2
Rotor of built-in permanent magnet motor and magnetic steel structural parameter determining method thereof
InactiveCN102157998AHigh mechanical strengthIncrease stiffnessMagnetic circuit rotating partsElectric machinePermanent magnet motor
The invention relates to a rotor of a high-quality and high-speed built-in permanent magnet motor and a magnetic steel structural parameter determining method thereof. In the invention, the whole section magnetic steel of each electrode of the rotor of a conventional built-in permanent magnet motor is divided into multiple sections of magnetic steel which have the same polarity and different widths; the multiple sections of the magnetic steel are respectively arranged in a rotor core; and reinforcing ribs with the function of magnetic isolation are arranged among the multiple sections of the magnetic steel. By reasonably modulating and determining the width and distribution of each section of the magnetic steel, the air gap magnetic density waveform approaches sine distribution; harmonic components are reduced to the greatest extent; the eddy current loss of the magnetic steel and the torque pulsation of the motor are simultaneously reduced; and the electromagnetic performance of the motor is enhanced. Furthermore, the multiple sections of the magnetic steel are arranged in the circumference along the rotor; the highest rotating speed of the safe operation of the rotor is greatly enhanced on machinery; the radial thickness which is needed by the magnetic circuit of the rotor is obviously reduced on the structure; the rotational inertia and weight of the rotor are reduced; the dynamic response of the motor is improved; and the requirements of a high-speed driving system on the performance of the motor are met.
Owner:SHANGHAI UNIV
Accurate one-dimensional rotary and two-dimensional tilting table
InactiveCN101436436AImprove carrying capacityHigh adjustment accuracyInstrumental componentsPosition/direction controlEngineeringWork demand
Owner:TONGJI UNIV
Networked layered compensation method for voltage unbalance of PCC (Point of Common Coupling) of islanded microgrid
ActiveCN104953606AImproving the accuracy of reactive power distributionImprove reliabilityEnergy industryPolyphase network asymmetry elimination/reductionSine waveAngular frequency
The invention relates to a networked layered compensation method for voltage unbalance of a PCC (Point of Common Coupling) of an islanded microgrid. The method comprises the following steps: (1), establishing a networked layered control system structure; (2), performing real-time detection, and converting all the electrical quantities into an alpha-beta coordinate system; (3), obtaining positive and negative sequence components of voltage or current; (4), computing the positive sequence active power and positive sequence reactive power at the PCC; (5), obtaining an output reference voltage and a reference angular frequency; (6), obtaining the input of a reference occurrence module; (7), obtaining the reference voltage at an alpha-beta stationary coordinate system; (8) sending the voltage v<abc> at the PCC to a secondary controller; (9), obtaining positive and negative sequence components; (10), obtaining UCR<alpha beta>; (11), feeding back the UCR<alpha beta> to a primary controller of each DG (Distributed Generator); (12), figuring out v<V alpha beta>; (13), calculating the reference value of a current control loop; (14), obtaining the switching drive pulse of an inverter; (15) driving switching tubes of a three-phase full bridge inversion circuit to switch on or off by the switching drive pulse, and controlling the inverter to output rated sine-wave voltage. According to the invention, the voltage at the PCC can be subjected to global compensation, and the reactive power distribution precision is improved.
Owner:LANZHOU UNIVERSITY OF TECHNOLOGY
Aquiculture pond dissolved oxygen control system
ActiveCN103336503AStrong inhibitory abilityStrong adaptabilityPisciculture and aquariaProgramme total factory controlWireless sensor networkingWireless sensor network
The invention discloses an aquiculture pond dissolved oxygen control system comprising a data acquisition and transmission layer and a data storage and sharing layer, which communicate with each other in a wireless way. By studying the characteristics of nonlinearity, greater inertia, long time delay and time-variation of dissolved oxygen change in an aquiculture pond and the difficult problem that a larger culture area is hard to control, and according to the invention, an aquatic product pond dissolved oxygen control system based on a wireless sensor network is designed, comprises the data acquisition and transmission layer and the data storage and sharing layer and forms a wireless sensor network monitoring system for detecting, intelligently controlling and managing dissolved oxygen in the culture pond.
Owner:宿迁市成子湖食品有限公司
Method for controlling grid-connected inverter of micro grid based on fuzzy PI algorithm
ActiveCN103956769AIncrease the damping ratioGuaranteed uptimeEfficient power electronics conversionAc-dc conversionControl signalFuzzy pi
The invention discloses a method for controlling a grid-connected inverter of a micro grid based on the fuzzy PI algorithm. The method comprises the steps that (1) the voltage of the current power grid, the output current of the current grid-connected inverter and the capacitive current of a current filter are sampled; (2) the command value of a grid-connected current is determined; (3) the proportionality coefficient and the integral coefficient of a PI controller are adjusted; (4) the command value of the capacitive current of the filter is acquired through the adjusted PI controller; (5) the command value of the output voltage of the grid-connected inverter is acquired through the PI controller; (6) a control signal is generated to control switch-on or switch-off of a switching tube of the grid-connected inverter, and an expected output voltage is generated at the power output end of the grid-connected inverter; (7) the step (1) to the step (6) are repeatedly executed to make the output current of the grid-connected inverter trace the command values all the time. According to the method, by adjusting the control parameter of the PI controller in an on-line mode through the fuzzy algorithm, the output current of the grid-connected inverter can trace a current command signal quickly and accurately.
Owner:HUAZHONG UNIV OF SCI & TECH
Sliding-mode variable structure control method of single phase grid-connected inverter based on multi-resonant sliding mode surface
ActiveCN102868183AImprove robustnessImprove dynamic response performanceSingle network parallel feeding arrangementsHarmonic reduction arrangementLinear state feedbackCarrier signal
The invention discloses a sliding-mode variable structure control method of a single phase grid-connected inverter based on a multi-resonant sliding mode surface. The method comprises the steps of: firstly, building a linear sliding mode surface according to detected current i1 of an inverter side filter inductor of the single phase grid-connected inverter, the voltage vc of a filter capacitor, the current i2 of a network side filter inductor, and the target output current i1* of a grid-connected inverter system, the target voltage vC* of the filter capacitor and the grid-connected target current i2*; adding a resonant item into the linear sliding mode surface so as to obtain the multi-resonant sliding mode surface; designing a sliding-mode variable structure controller by the multi-resonant sliding mode surface, leading a linear state feedback controller to an original nonlinear controller to obtain a final control quantity modulation wave d(s), and finally comparing the modulation wave with a carrier wave to generate a driving signal for driving a switch tube to act. According to the control method disclosed by the invention, the robustness and dynamic response ability of the grid-connected inverter system are improved; the tracking accuracy of grid-connected current is also improved; the harmonic content is removed, and the control method is simple and easy to achieve.
Owner:XI AN JIAOTONG UNIV
Self-adaption quasi-PRD control method for photovoltaic grid-connected inverter
ActiveCN104810859AImprove adaptabilityRealize online detectionSingle network parallel feeding arrangementsPhotovoltaic energy generationElectrical resistance and conductanceGrid connected inverter
The invention relates to a self-adaption quasi-PRD control method for a photovoltaic grid-connected inverter. The self-adaption quasi-PRD control method for the photovoltaic grid-connected inverter relates to the technical field of photovoltaic grid-connected inverter control, and aims to solve the problems that the existing photovoltaic grid-connected inverter has poor adaptability on power grid impedance change, and the stability of a photovoltaic grid-connected system is poor in a weak current grid. The method comprises the following steps of injecting disturbance current with specific frequency into a power grid through a disturbance current injection method; then obtaining a relational expression of current controller parameters and power grid impedance based on the principle of closed loop pole parameter configuration; when the power grid impedance Rg and power grid inductance Lg are changed, realizing self-adapting adjustment on controller parameters Kp, Kr and Kd so as to adapt to the ever-changing power grid impedance, so that the adaptability and the stability of the photovoltaic grid-connected inverter control system are improved. The self-adaption quasi-PRD control method for the photovoltaic grid-connected inverter can be used for controlling the photovoltaic grid-connected inverter.
Owner:HARBIN INST OF TECH
Embedded digitization controlled tube-plate all-position automatic welding inverter
InactiveCN101391336AGood consistencyGuaranteed arc stability and stiffnessArc welding apparatusDc-ac conversion without reversalThree-phaseHigh frequency
The invention is an embedded digital control inverter power source used in tube and plate overall position automatic welding, which comprises a main circuit, a control circuit and a high frequency arc-ignition circuit. The main circuit comprises a rectifying wave filter module, a high frequency inverter module, a power voltage-transforming module and a rectifying smooth module which are connected sequentially. The rectifying wave filter module is connected with a three-phase alternating current (AC) input power, and the rectifying smooth module is connected with a load. The control circuit includes an over-voltage and under-voltage protective testing module, a voltage and current sample testing and feedback module, an ARM microprocessor and a high frequency drive module. The over-voltage and under-voltage protective testing module is respectively connected with the three-phase AC input power and the ARM microprocessor. The voltage and current sample testing and feedback module is respectively connected with the ARM microprocessor and the load. The ARM microprocessor is also connected with the high frequency drive module and the high frequency arc-ignition circuit. The high frequency drive module is also connected with the high frequency inverter module, and the high frequency arc-ignition circuit is also connected with the load. The invention can realize the overall digital control of the tube and plate automatic welding inverter power source.
Owner:GUANGDONG POWER ENG +1
General loop current control method for modular multi-level converter considering low frequency oscillation
ActiveCN103475250AReduce lossSolve circulation control problemsAc-dc conversionLow-pass filterControl system
The invention discloses a general loop current control method for a modular multi-level converter considering low frequency oscillation. The general loop current control method is mainly used for restraining a low frequency oscillation loop current and a second harmonic generation loop current in a bridge arm loop current of the modular multi-level converter. The relation between a bridge arm voltage and the bridge arm loop current is analyzed to obtain the oscillation frequency of the low frequency oscillation loop current of the converter so as to provide beneficial evidence for the design of a control system; the cut-off frequency of a low pass filter is set according to the calculated value of the oscillation frequency; the bridge arm loop current passes through the low pass filter to obtain a direct current component, and then the direct current component is subtracted by the bridge arm loop current to obtain an alternating component of the bridge arm loop current; the alternating component contains a harmonic component of the low frequency oscillation loop current and a harmonic component of the second harmonic generation loop current; the alternating component passes through a regulator to obtain a control reference voltage of the bridge arm loop current, and the control reference voltage is added to a modulating signal. By means of the general loop current control method, a low frequency oscillation component and a second harmonic generation component in the bridge arm loop current are simultaneously restrained, the loop current control system is simplified, split-phase control over the loop currents is realized, loss of the converter is lowered, and the dynamic stability of the system is enhanced.
Owner:HUNAN UNIV
Three-ring control method and three-ring control device of single-stage type photovoltaic grid-connected inverter system
ActiveCN102780232ALow costQuick searchAc-dc conversionSingle network parallel feeding arrangementsEngineeringDc voltage
The invention discloses a three-ring control method and a three-ring control device of a single-stage type photovoltaic grid-connected inverter system. Three-ring control comprises a maximum power tracking outer ring, a direct-current voltage middle ring and a grid-connected current inner ring. Direct-current side voltage ring control is added so as to guarantee that the system can respond rapidly when outside illumination is reduced suddenly, direct-current bus voltage is stable in an operation process, and grid-connected current is not distorted. A maximum power tracking method adopts a step-variable disturbance observation method to enable the system to be operated at different voltage points so as to search the maximum power point rapidly. The control device comprises a sampling circuit, a capturing circuit, a digital signal processor (DSP) controller, a driving circuit and the like, and signals generated by the DSP controller are amplified by the driving circuit and sent to an inverter bridge to drive a switch tube. The control method can achieve that the single-stage type photovoltaic grid-connected inverter system can track the maximum power point rapidly when illumination varies frequently and is operated stably.
Owner:SOUTH CHINA UNIV OF TECH +1
Magnetic suspension rotor harmonic current suppression method based on composite friction repetitive controller
ActiveCN106647843ASolve the accuracy is not highShort delay timeMechanical oscillations controlPhase shiftedTime delays
The invention discloses a magnetic suspension rotor harmonic current suppression method based on a composite friction repetitive controller. Firstly, a magnetic suspension rotor dynamical model which comprises mass unbalance and sensor harmonic is established. Secondly, the composite friction repetitive controller is designed. The controller is obtained through parallelly connecting a double-mode friction repetitive controller and a phase shift notch filter. The double-mode friction repetitive controller comprises two branches, namely an odd-order harmonic suppression branch and an even-order harmonic suppression branch. The odd-order harmonic and the even-order harmonic can be suppressed in an enhanced manner through distributing the value of a control gain, and dynamic response performance is improved. A friction time delay link is replaced by a friction time delay filter, thereby improving harmonic current suppression precision. Furthermore the phase shift notch filter is introduced for performing additional suppression on fundamental frequency current, thereby reducing current overshoot and improving harmonic convergence speed. The magnetic suspension rotor harmonic current suppression method can realize harmonic current suppression in a fixed rotating speed and is suitable for magnetic suspension rotor harmonic current suppression in which mass unbalance and sensor harmonic exist.
Owner:BEIHANG UNIV
Load-sensitive hydraulic system and power matching control method, device and system
ActiveCN103671336AImproved handling and reliabilityImprove Control ConsistencyServomotor componentsThrottleControl valves
The invention relates to the technical field of engineering machinery, and discloses a load-sensitive hydraulic system, a power matching control method, device and system and an engineering machine. The load-sensitive hydraulic system, the power matching control method, device and system and the engineering machine are used for improving the control conformance, the dynamic responsiveness and the stability of the load-sensitive hydraulic system and the control performance of power matching. The load-sensitive hydraulic system comprises a variable pump assembly, a main control valve set, an actuator, an overflow valve and a flow control valve set. An oil inlet of the main control valve set is communicated with an oil outlet of the variable pump assembly, and a load-sensitive feedback oil path is arranged between a control oil port of the main control valve set and a control oil port of the variable pump assembly. Two oil ports of the actuator are communicated with two working oil ports of the main control valve set respectively. An inlet oil path of the overflow valve is communicated with the load-sensitive feedback oil path, and a switch valve is arranged on the inlet oil path of the overflow valve. An inlet oil path of the flow control valve is communicated with the load-sensitive feedback oil path, and the flow control valve comprises a proportional throttle valve and a first pressure-compensated valve arranged on an inlet oil path of the proportional throttle valve.
Owner:ZOOMLION HEAVY IND CO LTD
Demodulation method and device for optical distance variation of optical fiber interferometer sensor
ActiveCN101586969AReduce the number of sampling pointsLower requirementConverting sensor output opticallyFrequency spectrumImage resolution
The present invention provides a demodulation method for the optical distance variation of an optical fibre interferometer sensor, including steps of (1) detecting the spectrum of the optical fiber interferometer sensor; (2) transmitting the detected spectrum to a computer for a Fourier transformation or Z spectrum conversion to obtain an amplitude spectrum and a phase spectrum of an optical fiber interferometer sensor reflected signal; (3) obtaining an approx center frequency of the optical fiber interferometer sensor from the amplitude spectrum and then fixing the frequency point to monitor the change of the point phase; obtaining the optical distance change of the optical fiber interferometer sensor by the phase spectrum. By monitoring the phase change around the center frequency point in the phase spectrum after the optical spectrum and the frequency spectrum conversion of the optical fiber interferometer sensor, it is capable of obtaining the optical distance change of the interferometer sensor, comparing with the traditional detection of the change of the intensity frequency spectrum center frequency, the sensor center frequency point of the phase spectrum is more sensitive to the optical distance difference, thus the invention has a high sensitivity or resolution.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Worm wheel type driving pipeline robot system based on high-strength spring wall press apparatus
InactiveCN105487545AHigh precisionSmall overshootPosition/course control in two dimensionsVehiclesRobotic systemsPid control algorithm
A worm wheel type driving pipeline robot system based on a high-strength spring wall press apparatus is characterized by comprising a body mechanical structure and a control system; the body mechanical structure comprises a spiral head, a body and a holding frame; the body is a main body of the robot; the working method is that the robot system is a fully-closed loop servo control system taking wheel linear speed as a feedback quantity through a fuzzy adaptive PID control algorithm. The advantages of the robot system are: (1) the robot system can steadily and flexibly move within a tilted and vertical pipeline with a minimal variable diameter; (2) the robot system exhibits good dynamic responsiveness, robustness and stability; (3) signal transmission is convenient; and (4) the robot system is highly controllable and is high in accuracy.
Owner:TIANJIN UNIVERSITY OF TECHNOLOGY
Four-rotor aircraft output-limited backstepping control method based on integral sliding mode obstacle Lyapunov function
ActiveCN108037662AImprove dynamic response performancePrevent overshootAdaptive controlResponse processFlight vehicle
Provided is a four-rotor aircraft output-limited backstepping control method based on an integral sliding mode obstacle Lyapunov function. For the dynamic system of a four-rotor aircraft, an integralsliding mode obstacle Lyapunov function is selected, and a four-rotor aircraft output-limited backstepping control method based on the integral sliding mode obstacle Lyapunov function is designed. Theintegral sliding mode obstacle Lyapunov function is designed in order to ensure that the output of the system is limited within a certain range, avoid too large overshoot and reduce the time of arrival. Therefore, the dynamic response performance of the four-rotor aircraft system is improved. The invention provides a four-rotor aircraft output-limited backstepping control method based on an integral sliding mode obstacle Lyapunov function, which enables the system to have a good dynamic response process.
Owner:ZHEJIANG UNIV OF TECH
Oil-immersed transformer hot spot temperature evaluation method based on multi-parameter fusion
ActiveCN107063502AImprove dynamic response performanceAccurate responseThermometer applicationsCapacitanceDynamic equation
The invention discloses an oil-immersed transformer hot spot temperature evaluation method based on multi-parameter fusion. The oil-immersed transformer hot spot temperature evaluation method includes the following steps of (1) according to the process of heat transfer inside the transformer, clarifying the definition and calculation method of the hot spot heat source and hot oil area of the transformer, and reducing the calculation bias caused by taking the overall winding as the hot spot heat source; (2) correcting the algorithm of the hot oil area thermal capacitance Cwo and the hot spot thermal capacitance Chs, and improving the accuracy of the time constant tau wo and the winding time constant tau hs and the dynamic response capability of the calculation model; and (3) establishing the dynamic calculation equation of hot spot temperature by considering the influence of time-varying ambient temperature and time-varying load on the hot spot temperature. When the dynamic equation of the model is deduced, the temperature characteristics of the load loss and oil viscosity are further considered, and the calculation result can more accurately reflect the temperature rise inside the transformer. The method can dynamically reflect the characteristics of the temperature change inside the transformer, and the calculation is simple and the accuracy is high.
Owner:HAINAN POWER GRID CO LTD ELECTRIC POWER RES INST +1
Intelligent dimming driver for networking-type high-power packaged LEDs
ActiveCN101697653AGood dynamic performanceImprove consistencyAc-dc conversion without reversalEfficient power electronics conversionSingle phaseSoft switch
The invention provides an intelligent dimming driver for networking-type high-power packaged LEDs, which comprises a power adjusting system and a digital control system, wherein the power adjusting system is formed by sequentially connecting a single-phase rectifying filtering module, a resonant soft switch inverting module and a transforming and rectifying module which are switched in a single-phase alternating current input power; and the digital control system is formed by connecting an abnormity detection protection module, a sampling detection module, an ARM micro-processor system, a high-frequency driving module, a parameter setting module and a serial bus communication module mutually. The intelligent dimming driver for the networking-type high-power packaged LEDs can automatically match constant current, constant voltage and variable property driving output according to the working property of the high-power packaged LEDs so as to realize remote networking and intelligent dimming.
Owner:SOUTH CHINA UNIV OF TECH
Supercharged diesel engine EGR (Exhaust Gas Recirculation) system intelligent cooling device
ActiveCN103775252AImprove dynamic response performanceSpeed up the warm-up processInternal combustion piston enginesNon-fuel substance addition to fuelExhaust fumesIntercooler
The invention discloses a supercharged diesel engine EGR (Exhaust Gas Recirculation) system intelligent cooling device, comprising an EGR mixer (3), a mechanical water pump (4), an electric control fan (5), a radiator (6), a thermolator (11), an EGR cooler (13), an electric control EGR valve (14), an engine ECU (Electronic Control Unit) (18), a temperature sensor (19), an exhaust gas intercooler (8) and an electric control two-position three-way valve (12), wherein an inlet of the electric control two-position three-way valve (12) is communicated with a gas outlet of the EGR cooler (13); outlets in two ends of the electric control two-position three-way valve (12) are respectively communicated with an exhaust gas inlet of the EGR mixer (3) and a gas inlet of the exhaust gas intercooler (8); a gas outlet of the exhaust gas intercooler (8) is communicated with the exhaust gas inlet of the EGR mixer (3); the electric control EGR valve (14), the electric control fan (5), the temperature sensor (19) and the electric control two-position three-way valve (12) are respectively connected with the engine ECU (18) electrically.
Owner:DONGFENG COMML VEHICLE CO LTD
Supercritical DC furnace synthesis type coordinating control method
ActiveCN101509656AOvercome steam pressure overshoot or oscillationImprove dynamic responsivenessBoiler controlCoalCoordinate control
The invention relates to a comprehensive method for harmonizing and controlling a supercritical monotube boiler, comprising the steps as follows: 1) logic configuration of a traditional harmonizing and controlling system is carried out, the differential signal of the practical load given value is added in main control circuit of the boiler of the traditional harmonizing and controlling system, and interfaces are preserved for an increment-typed state observer, an inertia suppressor and a heat value observer; 2) the logic configuration of the increment-typed state observer is carried out and the output thereof is led into the traditional harmonizing and controlling system so as to be used as a feedforward signal for controlling the combustion rate; 3) the logic configuration of the inertia suppressor is carried out and the output thereof is led into the traditional harmonizing and controlling system so as to be used as the feedforward signal for controlling the combustion rate; 4) the logic configuration of the water-supply increment-typed state observer is carried out and the output thereof is led into the traditional harmonizing and controlling system so as to be used as a feedforward signal for controlling the water-supply; 5) the heat value observer is added in the heat value calculation circuit of the traditional harmonizing and controlling system, thus leading the heating-value signal of the quantity of the coal entering the boiler to be corrected. The method obtains excellent control effect during the controlling to the supercritical monotube boiler.
Owner:CHINA ELECTRIC POWER RES INST +2
Closed-loop control method for battery full-range charging
ActiveCN105826997AEfficient chargingImprove securityBatteries circuit arrangementsDc-dc conversionPower inverterPhase shift control
The invention discloses a closed-loop control method for battery full-range charging. The method is based on an open-loop circuit of a wireless power transmission system. The open-loop circuit of the wireless power transmission system comprises a direct-current power supply, an inverter, a primary-secondary resonant network, and a rectifier, wherein the direct-current power supply, the inverter, the primary-secondary resonant network, the rectifier and a battery are connected in sequence. The method comprises the following steps: which stage the battery is in is judged, wherein the charging stages of the battery include a constant-current charging stage, a constant-power charging stage, and a constant-voltage charging stage; when the battery is in the constant-current charging stage, the inverter is controlled in a fixed-frequency phase shift control method; when the battery is in the constant-power charging stage, the inverter is controlled in the fixed-frequency phase shift control method; and when the battery is in the constant-voltage charging stage, the inverter is controlled in a frequency-hopping phase shift control method. Through the method, full-range efficient battery charging is realized. The system is of high safety and stability.
Owner:深圳市奥特迅软件有限公司
Variable pitch control method of wind generating set
ActiveCN108533451ASolve the problem of speedingReduce fatigue damageWind motor controlEngine fuctionsFatigue damageElectricity
The invention discloses a variable pitch control method of a wind generating set. The method includes the steps: acquiring real-time rotating speed of a wind wheel and real-time pitch angles of bladesof the wind generating set; calculating variable pitch speed of the blades by a proportional differential control algorithm according to the real-time rotating speed and the real-time pitch angles; controlling variable pitch rotation of the blades according to the variable pitch speed. Compared with a traditional proportional integral control algorithm, the pitch angles cannot be converted into the variable pitch speed, the variable pitch speed is directly acquired, so that delay and indeterminacy increased by a converting link are avoided, tracking of a system is accelerated, the dynamic response capability of a variable pitch system of the wind generating set is improved, the method solves the problem of excessive speed of the wind generating set under gale and strong turbulence, so that generation of an extreme load is avoided, fatigue damage to the wind generating set is reduced, and availability and the generating capacity of the wind generating set are improved.
Owner:CSIC CHONGQING HAIZHUANG WINDPOWER EQUIP
Direct-set load torque and rotational inertia simulating system and control method thereof
InactiveCN104122035AAvoid the impact of control accuracyEasy to useSimulator controlStatic/dynamic balance measurementElectric machineLoad torque
The invention provides a direct-set torque and rotational inertia simulating system and a control method thereof. The control method comprises providing the driving torque of the measurement input shaft of a torque sensor and collecting driving torque signals, computing the target torque of a load motor through a bench controller according to set load torque and set rotational inertia and the driving torque signals, sending load motor target torque instructions to a motor direct torque controller, and receiving the load motor target torque instructions and controlling the load motor to output corresponding torque through the motor direct torque controller. According to direct-set torque and rotational inertia simulating system and the control method thereof, by taking the torque as the controlled target, influence of acceleration computing errors on control precision can be avoided; adjusting control parameters according to different bench controllers can be omitted, and usage simplicity and dynamic responsiveness can be obtained; redundancy monitoring for the operation status of the bench controller can be achieved, so that the reliability of a bench can be enhanced.
Owner:SOUTHWEST UNIVERSITY
On-line joint servo system parameter identification and controller parameter optimization method
ActiveCN104391497AImprove dynamic response performanceProgramme-controlled manipulatorElectric testing/monitoringDamping factorLoad torque
The invention provides an on-line joint servo system parameter identification and controller parameter optimization method. The method comprises the following steps: under the condition of unknown load torque, identifying load rotational inertia and damping coefficients online simultaneously based on a discrete model reference adaptive algorithm; and optimizing parameters of a speed controller according to the identified load rotational inertia. According to the technical scheme provided in the invention, rotational inertia and the damping coefficients can be identified online simultaneously, and the parameters of the speed controller are optimized according to the identification results, and dynamic response performance of the speed is improved.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Control circuit, switching converter and control method thereof
ActiveCN102891596AIncrease the switching frequencyImprove dynamic response performanceAc-dc conversion without reversalEfficient power electronics conversionControl signalEngineering
The invention discloses a control circuit, a switching converter and a control method thereof. The switching converter comprises a first switching tube; the control circuit controls the on-off of the first switching tube; when a control signal in a power-saving mode is in an effective state, the switching converter is switched to work in the power-saving mode, and the on time of the first switching tube is increased; and therefore, the efficiency of the switching converter in the power-saving mode is improved.
Owner:CHENGDU MONOLITHIC POWER SYST
Double DSP built-in control system for visual feedback during soldering process
InactiveCN101256399AReduce system size and system architecture complexityImprove accessibilityComputer controlSimulator controlQuality controlLoop control
The invention discloses a double DSP embedded type welding process visual feedback control system for welding seam tracking and welding quality control in welding automation, comprising a DSP image processing module, a DSP feedback control module, a power and reset module, a visual interface module, an analog video coding module and a USB control module. The DSP image processing module extracts the eigenvalues of a welding region image transmitted from the video interface module and transmits to the DSP feedback control module, the DSP feedback control module outputs corresponding signals according to the eigenvalues, and finishes close-loop control of welding seam tracking and welding quality. By this invention, welding seam tracking and welding seam shaping control can be carried out without a host computer.
Owner:TSINGHUA UNIV +1
Four-rotor aircraft output limited backstepping control method based on asymmetric time-varying obstacle Liapunov function
ActiveCN107831671AImprove transient performanceShorter arrival timeAdaptive controlResponse processLiapunov function
A four-rotor aircraft output limited backstepping control method based on an asymmetric time-varying obstacle Liapunov function; the invention aims at the four-rotor aircraft dynamics system, selectsthe asymmetric time-varying obstacle Liapunov function, and designs the four-rotor aircraft output limited backstepping control method based on the asymmetric time-varying obstacle Liapunov function;the asymmetric time-varying obstacle Liapunov function ensures the system output to be limited in a certain scope, can prevent overlarge overstrikes, and can reduce the arrival time, thus improving the four-rotor aircraft system dynamic response performance; the four-rotor aircraft output limited backstepping control method based on the asymmetric time-varying obstacle Liapunov function enables the system to have a good dynamic response process.
Owner:ZHEJIANG UNIV OF TECH
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