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96results about How to "Simple control method" patented technology

On-line coordination control method for plate shape and plate thickness of strip tandem hot continuous rolling mill

InactiveCN101890433ALower control costsSimple control methodRoll force/gap control deviceProfile control deviceSlice thicknessEngineering
The invention discloses an on-line coordination control method for the plate shape and plate thickness of a strip tandem hot continuous rolling mill, belonging to the technical filed of hot continuous rolling of sheets and strips. The method is characterized by comprising the following steps: (1) collecting n rack hot continuous rolling mill equipment and rolling schedule parameters; (2) collecting the roll force and the convexity offset value of a last rack plate in situ; (3) calculating the plate shape stiffness of each rack; (4) keeping the thickness of the outlet of the tail rack to be constant; (5) inversely calculating the convexity variable quantity of the mechanical plate of the i rack from the tail rack; (6) calculating the roll force and the variable quality of the thickness of the inlet of the i rack; (7) calculating the thickness of the new inlet and outlet of the i rack; (8) calculating the rolling reduction and adjusted quantity of the i rack; (9) calculating the convexity variable quantity of the outlet plate of the (i-1) rack according to the equi-proportional convexity condition; (10) repeating steps from (5) to (9) to obtain the rolling reduction and adjusted quantities of 2nd to n racks; (11) calculating the rolling reduction and adjusted quantity of the first rack; and (12) carrying out on-line coordination control according to the rolling reduction and adjusted quantities, thereby achieving the purpose of coordination control on the plate shape and plate thickness.
Owner:TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Delayless control method of rotor current of grid-connection, speed-change and constant-frequency double-fed induction wind driven generator

The invention discloses a delayless control method of rotor current of a grid-connection, speed-change and constant-frequency double-fed induction wind driven generator (DFIG). The conversion of a rotational coordinate is carried out by collecting three-phase rotor current signals, the feedback quantity of rotor current in a corotation synchronous-speed rotating coordinate system is obtained and is compared with a rotor current command in the same coordinate system, an error signal is inputted into a proportional-integral-complex coefficient resonance regulator for regulation, and the rotor reference voltage in the corotation synchronous-speed rotating coordinate system is obtained after feedback compensation decoupling and then converted into the rotor reference voltage used for space vector pulse width modulation (SVPWM) in the rotor coordinate system to generate a switching signal of a power device of a rotor side convertor so that DFIG grid-connected operation can be controlled. The method does not need to carry out positive and negative sequence decomposition of rotor current under balanced or unbalanced grid voltage, can not introduce decomposition time delay and can realize the reinforced control target of a power generation system under the unbalanced grid voltage, thereby effectively increasing the ride-through (uninterrupted) operation capability of a wind power system under power grid failure.
Owner:ZHEJIANG UNIV

Dual-feed asynchronous wind power generator rotor current non-delay control method

InactiveCN101141111ASimple control methodIncrease control bandwidthGenerator control detailsWind forcePower component
The invention discloses a nondelay control method for the current of the rotor of the variable speed constant frequency double feed nonsynchronous aerogenerator(DFIG). The transformation of coordinates of static three phase/two phase of the rotational coordinate is finished by collecting three phase rotor current signal so as to obtain the rotor current feedback amount in the static frame of axes to compare with the rotor current command in the stator static frame of axes, the difference signal is input into the proportion-resonance regulator for comparison, the rotor voltage reference value in the stator static fame of axes is obtained after feedback compensation decoupling. The rotor voltage reference value is then transformed into reference signals for space vector pulse width regulation in the rotor frame axes to generate switch signals of the power components of the converter of the rotor to control the synchronize and close operation of the generator. The invention is needless of the break down of the positive and negative sequence of current of the EFIG rotor no matter the electric net voltage is balance or not without introducing break down delay. The invention can realize strengthened control of the generating system in imbalanced electric net, effectively improve non-stop operation of the aerogenerator.
Owner:ZHEJIANG UNIV

Control and deformation compensation method for intelligent arm supports of concrete pump truck

ActiveCN103206090ASimple control methodImprove trajectory control accuracyBuilding material handlingTarget angleCompensation methods
The invention discloses a control and deformation compensation method for intelligent arm supports of a concrete pump truck. The method includes the specific steps: (1) giving an operation amount through a wireless remote controller transmitter by an operator and receiving the operation amount by a remote controller to obtain coordinate variations delta x, delta y and delta z of endpoints of the arm supports; (2) converting coordinates by an intelligent operation algorithm to obtain target angles beta of the arm supports and towers; (3) mounting ground absolute tilt angle sensors a1-a8 at arm heads and arm tails of intelligent arms of the concrete pump truck respectively and measuring tilt angles of the towers by a ground absolute tilt angle sensor a0; and (4) setting measured values of the ground absolute tilt angle sensors as ai, and calculating controlled quantities of the arm supports of the concrete pump truck and equivalent relative included angles of the arm supports according to the measured values ai of the ground absolute tilt angle sensors, wherein the equivalent relative included angles include the relative included angle beta i between each two adjacent arm supports and arm support deformation compensation angles delta i. The method has the advantage that intelligence of the pump truck and track control precision of tail ends of the arm supports can be improved.
Owner:JIANGSU XCMG CONSTR MASCH RES INST LTD

Direct torque control method for harmonic voltage injected multi-phase induction motor

InactiveCN102361433AOptimal Control StructureSimple control methodElectronic commutation motor controlVector control systemsMagnetic potentialVoltage vector
The invention discloses a direct torque control method for a harmonic voltage injected multi-phase induction motor. In a multi-phase motor system, non-sinusoidal voltage and current are supplied, so that the air gap magnetic density waveform is quasi-square wave, the magnetic potential and the magnetic density peak of fundamental wave can be reduced, and the utilization rate of an iron core material and the power density of a motor are improved. When the multi-phase motor is driven by a voltage type frequency converter, the circuit impedance of fundamental wave and harmonic spaces is changed together with the change of a load, and the control requirement that the air gap magnetic density is square wave cannot be met by adopting fundamental wave and harmonic voltage constant proportion control. Therefore, in a direct torque control system of the multi-phase motor driven by the voltage type frequency converter, effective control of fundamental wave and harmonic voltage amplitudes and phases must be realized. A variable frequency speed control system of a five-phase centralized integral pitch winding induction motor is taken as an example in the method (which is also suitable for a random multi-phase induction motor system), a control scheme of combining spatial voltage vector modulation and direct torque control is adopted, and fundamental wave and third harmonic reference voltages are calculated by controlling torques respectively formed by the fundamental wave and the third harmonic and controlling stator flux. The control method realizes closed loop control of the fundamental wave and harmonic voltages, ensures a constant phase relationship between the fundamental wave and the third harmonic flux, and achieves the control requirement that the air gap magnetic density waveform is the quasi-square wave. Due to effective control on harmonics, the output torque of the motor is increased, and the robustness and the dynamic steady state performance are also improved.
Owner:乔鸣忠 +2

Automobile heat radiation system matched with hydraulic retarder and control method of automobile heat radiation system

The invention discloses an automobile heat radiation system matched with a hydraulic retarder and a control method of the automobile heat radiation system. The automobile heat radiation system comprises a cooling loop system, an electronic water pump, a water temperature sensor and a control module. The cooling loop system comprises a heat radiation water tank, an original automobile water pump, an engine water inlet pipe and an engine water outlet pipe. A water outlet of the original automobile water pump is communicated with the engine water outlet pipe, the engine water outlet pipe is communicated with a water inlet of a retarder, a water outlet of the retarder is communicated with a water inlet of a thermostat, a water outlet of the thermostat is divided into two communicated with a water inlet of the heat radiation tank and a water inlet of the original automobile water pump respectively, a water outlet of the heat radiation water tank is communicated with the engine water inlet pipe, and the engine water inlet pipe is communicated with the water inlet of the original automobile water pump; the electronic water pump is arranged in parallel to the original automobile water pump, and the control module controls opening and closing of the electronic water pump. The automobile heat radiation system is simple in structure and capable of meeting requirements of heat radiation of the automobile cooling system and is oil saving.
Owner:SHAANXI FAST GEAR CO

Non-symmetrical PWM control type ISOP full-bridge direct-current converter and control method thereof

The present invention discloses a non-symmetrical PWM control type ISOP full-bridge direct-current converter and a control method thereof. The input side of each module of a converter comprises an input capacitor, an inverter bridge and a transformer primary side. The output side of each module of the converter comprises a transformer secondary side, a full-bridge rectifier circuit and an LC filter circuit. The positive electrode of an input direct-current power supply is in series connection with an input inductor and then is connected to the first bridge arm middle point of the inverter bridge of the input side of the first module. The negative electrode of the input direct-current power supply is connected with the negative end of the input capacitor of the last module. The connection mode of two adjacent modules is as follows: the negative end of the input capacitor of a former module is connected with the first bridge arm middle point of the inverter bridge of a latter module. Based on the above structure, the capacitive short circuit problem of the input power supply during the short-circuited stage can be effectively avoided. The converter is modulated in the non-symmetrical PWM manner, so that the voltage of the input capacitor is reduced. The capacitance value and the size of the input capacitor are reduced. The modules are driven in the staggered manner, so that the input and output current/voltage ripples are effectively reduced, and the requirements of a filter are lowered.
Owner:SOUTHEAST UNIV

Method for controlling electronic expansion valve in air conditioner system

The invention discloses a method for controlling an electronic expansion valve in an air conditioner system. The method includes the steps that firstly, the electronic expansion valve is started and initialized, the air sucking temperature of a compressor and the valve back temperature of the electronic expansion valve are detected in real time, and the practical superheat degree of the electronic expansion valve is calculated according to the difference of the air sucking temperature of the compressor and the valve back temperature of the electronic expansion valve; the target overheat degree of the electronic expansion valve is set according to the inlet water temperature value of an evaporator and the changing trend of the temperature; the practical overheat degree is compared with the target overheat degree, and the optimal opening degree range of the electronic expansion valve is determined through a closed-loop control system. The method has the advantages that by means of the scheme, the practical overheat degree can be calculated by the system, the practical overheat degree is compared with the set target overheat degree, and the optimal opening degree range is determined. The control method is simplified, the equipment cost is reduced, automatic control over the refrigerant flow and the throttling degree can be achieved, and reliable and safe operation of the equipment system is protected.
Owner:BRIGHT AIR CONDITIONING

Buck terminal coupled inductor buck-boost conversion circuit and control method thereof

The invention discloses a Buck terminal coupled inductor buck-boost conversion circuit and belongs to the DC non-isolated conversion technology, and the stable output voltage can be achieved in a wideinput voltage range. According to the invention, a coupled inductor, three power switch tubes and three freewheeling diodes are mainly used to achieve a buck-boost function, and the stable output voltage is ensured. In the present invention, the current in a Buck terminal coupled inductor operates in a discontinuous mode, the zero-current turn-on of two power switch tubes of a Buck terminal and the zero-current turn-off of two freewheeling diodes of the Buck terminal can be achieved, the problem of the reverse recovery of two diodes at the Buck terminal is eliminated, therefore, the soft switching function is realized, and the efficiency of the conversion circuit is improved. The current sharing control is not required, and even if the duty ratios of the two power switch tubes of the Buckterminal are slightly different, the uniform current of two inductor currents in the coupled inductor can be realized. The invention is suitable for applications such as wide input electric vehicles,fuel cells, photovoltaic power generation, wind power generation and other new energy supply systems.
Owner:IANGSU COLLEGE OF ENG & TECH

Cavity resonance-based control method for reducing combustion noises of combustion engines

The invention belongs to the technical field of combustion engines, and relates to a cavity resonance-based control method for reducing combustion noises of the combustion engines. The control method comprises the following steps: performing an phonics response experiment to a combustion chamber of a selected combustion engine to determine a combustion chamber cavity resonance frequency range corresponding to different crank shaft rotor angles of the combustion engine, inputting the frequency range to a ECU (Electronic Control Unit) of the combustion engine for use during the operating process of the combustion engine in an MAP (map analyzer program) manner; during the operating process of the combustion engine, performing on-line high frequency filtering on the high frequency pressure oscillation data in a time window according to the measured air cylinder pressure signals, and using a wavelet analyzing method to acquire the combustion chamber cavity resonance frequency corresponding to different crank shaft rotor angles; and further, comparing combustion chamber cavity resonance frequencies corresponding to different crank shaft rotor angles with the combustion chamber cavity resonance MAP corresponding to different crank shaft rotor angles in the ECU, and taking corresponding measures to reduce the cylinder high frequency pressure oscillation of a ring. The cavity resonance-based control method for reducing the combustion noises of the combustion engines can effectively reduce the combustion noises of the combustion engines, especially small combustion engines.
Owner:TIANJIN UNIV

Web development front-end and rear-end separation authority control method and system

The invention discloses a web development front-end and rear-end separation authority control method and system, and relates to the technical field of web system authority control. The method comprises the steps of creating a role; initializing a service packet and interface data corresponding to the service packet; initializing functions and function interface data corresponding to the functions;initializing a menu and menu functions; initializing a role menu; initializing a role menu function; initializing an interface capable of being called by a role; carrying out role permission controljudgment; when a user calls an interface, the back end acquiring the role of the user; querying an interface list which can be called by the role of the user, and judging whether calling can be carried out or not according to the interface list which can be called by the role of the user. By decoupling the interface service logic and the permission control part, the rear-end interface only needs to realize the service logic, and when the interface needs to be increased or decreased, only the corresponding relationship between the function and the interface needs to be modified, so that the control method of the interface calling permission can be simplified, and the permission control complexity is reduced.
Owner:BEIJING BEWINNER COMM CO LTD

Control method of direct-driven wind power plant inductive weak power grid grid-connected subsynchronous oscillation suppression device

The invention discloses a direct-driven wind power plant inductive weak power grid grid-connected subsynchronous oscillation suppression device and a control method thereof. The invention mainly comprises a subsynchronous oscillation suppression device and an improved virtual synchronous machine control method thereof, which are used for suppressing subsynchronous oscillation of a direct-driven wind power plant under a condition of grid connection of an inductive weak power grid. The subsynchronous oscillation suppression device comprises a static synchronous reactive power compensator and a battery energy storage system. A storage battery is connected to a direct current side of a static synchronous reactive power compensator, and the control method is improved virtual synchronous machinecontrol. By using the direct-driven wind power plant inductive weak power grid grid-connected subsynchronous oscillation suppression device and the control method thereof, subsynchronous oscillationcaused by interaction between a direct-driven wind power plant and an inductive weak power grid can be well suppressed, and a solution is provided for treatment of direct-driven wind power plant inductive weak power grid grid-connected subsynchronous oscillation.
Owner:HUNAN UNIV

Method for controlling synchronous impact of clutch

InactiveCN102705398AReduce shockSimple control methodElectrically actuated clutchesSynchronous motorClutch
The invention relates to a method for controlling a clutch, in particular to a method for controlling synchronous impact of the clutch. The method uses the control strategy to reduce the friction torque before synchronizing through reducing the joint pressure at the slipping friction stage of the clutch so as to reduce the synchronous impact. The joint position of the clutch is determined according to the rotary speed of the slipping friction and the change of the change rate of the rotary speed of the slipping friction, namely, the execution mechanism of the clutch moves forwards at the beginning of the jointing stage of the clutch, so that the joint position can be quickly reduced, the friction torque can be quickly enlarged, and the slipping friction time and the slipping friction work at the stage can be reduced as far as possible; and the execution mechanism of the clutch is controlled to move oppositely when synchronization is about to be achieved, namely, the rotary speed of the slipping friction reaches a certain value, so that the joint position can be enlarged, and the friction torque before synchronization can be reduced so as to reduce the synchronous impact of the clutch in the jointing process. According to the control method provided by the invention, the impact at the synchronizing time is effectively reduced, and the slipping friction is not remarkably increased in the joint process. The control method is simple and has strong instantaneity.
Owner:BEIJING UNIV OF TECH
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