38results about How to "Achieve smooth control" patented technology

The invention relates to a piezoelectric switch type valve positioner control method and a piezoelectric switch type valve positioner control system. The system consists of a 4-20mA current source, a current-to-voltage (I / V) conversion circuit, a voltage conversion module, a control signal amplifying and filtering circuit, a feedback signal amplifying and filtering circuit, 2 external analog-to-digital converter (ADC), an ultra-low power consumption singlechip, a liquid crystal keyboard module, an electrically erasable programmable read-only memory (EEPROM), a passive crystal, and a piezoelectric valve driven amplifying circuit. The control method comprises the steps of: determining the optimum pulse width modulation (PWM) duty cycle during the self-tuning of parameters; and adopting a five-step switching method with reverse PWM during the control. The piezoelectric switch type valve positioner control method and the piezoelectric switch type valve positioner control system can effectively avoid the overshoot phenomenon during the control of a valve positioner, solve the non-linear problem of an actuating mechanism, and have stronger universal applicability.

A numerally controlled machine-tool for machining the magnetically levitating rail is composed of main body with 36 m in length, vertical column, mainshaft box, control system and manipulating station. It features its other units including three drive mechanisms for X, A and B axises, a slide seat of vertical column, a rotary seat of vertical volumn and a slide saddle moving along vertical column. The said mainshaft box is arranged to slide saddle. The said control system and manipulating station are connected to slide seat. Its advantage is high precision in whole length range of workpiece.

The invention relates to a hybrid energy storage control method. Power control of smooth fluctuation is carried out on a micro-grid system which is composed of hybrid energy storage and distributed power supply; the hybrid energy storage is a hybrid energy storage system which is composed of a super capacitor and a storage battery; the distributed power supply is wind power; in the hybrid energy storage control method, the output power of the distributed power supply is subjected to fourier transform to obtain a power fluctuation spectrogram; and respective power of the super capacitor and the storage battery is determined through second-order low-pass filtering as reference values of constant power control of the energy storage system, so that smooth control on output power of a grid-connected connecting line of a micro-grid system is achieved. According to the hybrid energy storage control method, reference power after second-order low-pass filtering can be further corrected, so that smooth fluctuation power control on hybrid energy storage is achieved on the basis of charge and discharge power imitation of the battery.

The invention discloses a method and a device for smoothing a video bit stream so as to improve the quality of a video. The method comprises the steps of using an encoder to receive a video frame to be encoded; using the encoder to carry out encoding treatment on the video frame to be encoded, and reducing the frequency of sending the video frame when the encoder determines that the video bit stream for transmitting the video frame is larger than or equal to a set first video bit stream threshold. The adoption of the technical scheme can control the sending end to send video data through the relatively smooth video bit stream, avoid the problem of data packet dropout caused by too large video bit stream and further improve the quality of the video received by the receiving end.

The invention relates to a smooth control method for the torque of a switched reluctance motor. The control mode of the switched reluctance motor is a current chopping control mode. When two phases are simultaneously conducted, the currents of two-phase conducting regions in the current chopping control mode are respectively reduced to preset current amplitude values, and the torque amplitude when the two phases are simultaneously conducted approaches to the torque amplitude when one phase is conducted. According to the smooth control method, the torque amplitude when the two phases are simultaneously conducted approaches to the torque amplitude when one phase is conducted, so that the torque fluctuation is effectively inhibited, the torque pulsation is reduced, and the torque is smoothly controlled.

The invention discloses a controlling method and a controlling device of the smooth starting or braking of a swing mechanism; the controlling method comprises the specific steps: when the swing mechanism is started, a control signal inputted into a rotation power outputting mechanism ascends ramp step by ramp step with the time change; when the swing mechanism is braked, a control signal inputted into the rotation power outputting mechanism descends ramp step by ramp step with the time change; by the changes, an impact frequency is obtained and a natural frequency generated by inertial impactions is weakened, thus realizing starting or braking quickly and smoothly. The device comprises an inputting device which is used for inputting a command controlling the rotation of the swing mechanism, a controller and the rotation power inputting mechanism; when the controller outputs a controlling command for starting, the wave shape of an outputted starting signal ascends ramp step by ramp step with the time change; when the controller outputs a controlling command for braking, the wave shape of an outputted braking signal descends ramp step by ramp step with the time change; and the rotation power outputting mechanism is used for driving the swing mechanism to rotate.

The invention provides a pneumatic proportional valve fuzzy sliding mode self-adaptive control method based on a T-S model. The method is characterized in that the method comprises the following steps: the step 1) carrying out T-S model structure identification; the step 2) identifying T-S model parameters by utilizing a least squares support vector machine; and the step 3) designing a fuzzy self-adaptive controller according to the identified T-S model to carry out control on a pneumatic servosystem so as to enable a controlled object to carry out pressure tracing on given reference signals. According to the method, the pneumatic servosystem is served as a research object, the T-S model of the object is identified through the input / output data, and then, control of the pneumatic servosystem is realized based on the identified model. Compared with an existing PID control method, the control method in the invention allows vibration and overshoot of output pressure of a proportional valve to get smaller obviously, and thus smooth control of the pressure is realized. The control method can be dynamically adaptive to uncertain factors of the controlled object.

The embodiment of the invention provides an adaptive cruise system, which comprises a perception prediction assembly, a motion planning assembly and a motion control assembly, and is characterized in that the perception prediction assembly is an upstream assembly of motion planning, the motion planning assembly is a downstream assembly of motion planning, and the perception prediction assembly is used for determining target data in a region of interest of a vehicle; the motion planning assembly is used for planning a motion curve of the vehicle through an operator split quadratic programming OSQP solver according to the target data; and the motion control assembly is used for controlling motion of the vehicle according to the motion curve and a PID controller, smooth control over the motion of the vehicle is achieved, the control precision is improved, the driving safety, comfort and energy saving performance are improved, and the driving experience of a user is improved.

The invention provides a robot welding-cutting anti-collision device. The robot welding-cutting anti-collision device is characterized in that the robot welding-cutting anti-collision device comprisesa mandrel, a cover plate, a reset plate, an auxiliary spring and a shell; the mandrel is of a hollow structure, one end of the mandrel is provided with a welding gun, and the other end of the mandrelis connected with a reset plate; the reset plate is in a cake shape, and is installed at one end of the mandrel in a sleeving mode and fixedly connected with the mandrel; the shell is divided into anopen end and a bottom, and the center of the bottom is provided with a round through hole; the cover plate is installed at the open end of the shell, the middle of the cover plate is provided with around through hole, and the round through hole is used for allowing the mandrel to pass, does not make contact with the mandrel and is away from the mandrel by a certain distance; the end, provided with the reset plate, of the mandrel is in pressing connection with the inner bottom of the shell through the auxiliary spring; and the cover plate makes plane contact with the reset plate, and the cover plate and the reset plate have the precise positioning and reset functions. The robot welding-cutting anti-collision device is low in collision torque, high in repetition precision, balanced in collision force, wide in working range and capable of achieving precise reset after collision in any direction.

The invention relates to an automatic washing method for a rectifying tower pipeline and belongs to the technical field of chemical oil refining production pipelines. According to the automatic washing method, on the basis of traditional liquid level-flow cascade control, dynamic function compensation is conducted on a tower bottom liquid level variable, that is to say, a main liquid level disturbance variable, the variable quantity of tower feed quantity, is adopted as a feed forward signal. The feed variable quantity is preset according to process requirements, the purpose is to stabilize the tower bottom liquid level, a dynamic function compensation method is adopted, effective dynamic control is conducted on the tower bottom liquid level, and thus the tower bottom liquid level can still operate stably under the circumstance of process adjusting of the feed quantity. Through the automatic washing method, stable control over the tower bottom liquid level of a rectifying tower can be achieved, and thus the influence of change of the feed quantity on normal production of the rectifying tower is reduced greatly; and meanwhile, the influence of model mismatch on the function of dynamic function compensation is lowered, a filtration module is added, and thus the system robustness is enhanced.

The invention discloses a neutral network based temperature control method and system for a ring cooler. The method comprises the following steps of: obtaining a current detection temperature of eachtemperature zone by a temperature detecting device arranged in the temperature zone of the ring cooler; inputting the current detection temperature of each temperature zone into a pre-trained neutralnetwork model to obtain a predicating temperature, namely the temperature, obtained by considering mutual coupling and other interference factors of the temperature in each temperature zone, of the temperature zone; and comparing the predicating temperature of each temperature zone with a temperature threshold value which corresponds to the temperature zone, and regulating air quantity output by an air blower which corresponds to the temperature zone which exceeds the temperature threshold value, thereby realizing regulation on the temperature in each temperature zone. According to the embodiment of the invention, temperatures of various zones in the ring cooler are monitored, and effective decoupling control can be realized through a neural network, so that stable control on the temperature of each temperature zone in the ring cooler is realized.

The invention relates to a temperature controller, in particular to a large-LCD (Liquid Crystal Display) touch-type programmable temperature controller. The hardware structure of the large-LCD touch-type programmable temperature controller comprises an MCU (Microprogrammed Control Unit) main control circuit, wherein a power supply circuit and a keying circuit are connected to the MCU main controlcircuit, a crystal oscillator circuit and a man-machine display circuit are also connected to the MCU main control circuit and the MCU main control circuit is connected through connecting circuits ofan upper circuit board and a lower circuit board for controlling an output interface circuit. According to the invention, the need of current society for an environment-friendly and energy-saving temperature controller is met, potential safety hazards in the use of the temperature controller are lessened, the reliability of the temperature controller and a control system to which the temperature controller belongs is improved, a user can adjust needed parameters according to personal desires, user experiences are improved, and the requirement on a user for the individualized adjustment of a target temperature in practical applications is met.

The invention provides a film gluing device, and belongs to the technical field of film machining. The film gluing device comprises a film winding mechanism and a gluing mechanism; a guide roller of the film winding mechanism is rotationally arranged on a left bracket; a left support roller is rotationally arranged on the left bracket; a right support roller is rotationally arranged on a right bracket; the left support roller and the right support roller are positioned on the same horizontal height; a pressing roller is rotationally arranged on the right bracket, and is near and not contacted with the right support roller; a gluing support jaw of the gluing mechanism is hinged to a gluing bracket through an upper pin shaft; a support jaw is hinged to the gluing bracket through a lower pin shaft; a gluing roller is rotationally arranged at one end of the gluing support jaw; a support roller is rotationally arranged at one end of the support jaw; the upper and lower ends of a gluing tension spring are respectively connected with an upper pull rod and a lower pull rod; a top plate is mounted at one end of a piston rod; and a glue nozzle is mounted on a nozzle bracket. The film gluing device not only can quickly realize the film gluing, but also can quickly realize adjustment of the gluing position.

The invention relates to a modeling and flow control method for a high-speed compressor under a variable height. For the influence of changes of the working height of a high-speed centrifugal compressor for a fuel cell on a compressor model and the flow control, the modeling and flow control method for the high-speed centrifugal compressor under the variable height is provided. First an inlet airpressure and inlet air density model of the centrifugal compressor under the variable height is established, and static and dynamic models of the centrifugal compressor under variable height conditions are established. Based on the static and dynamic models of the compressor, the super-twisting sliding mode principle is adopted to perform smooth tracking control on the compressor flow. The modeling and flow control method has the advantages that in the modeling method for the centrifugal compressor under the variable height, the influence of height changes on the centrifugal compressor model is taken into account; through the flow control method under the variable height, the smooth control of the compressor flow is achieved, and the influence of height changes on the flow fluctuations isreduced.

The invention relates to a vehicle starting control method and a vehicle starting system. When activation of a signal is valid, whether an obstacle exists or not in the vehicle driving direction is detected; under an obstacle-free condition, or an obstacle exists yet no collision danger exists, the vehicle is controlled to be started according to a set standard starting curve; in the mode that starting is conducted according to the standard starting curve, starting control over smooth driving can be promoted; high-comfort, convenient and intelligent driving control functions are achieved, andthe purposes of maximizing the fuel saving amount and improving fuel saving are achieved.

The invention discloses a tower crane lifting hook anti-swing control system and a method. The system comprises a lifting hook mounted on a lifting arm frame, a control device, and a rotation control device, a motor driving control device connected with a rotation motor and a detecting device, which are respectively connected with the control device. When the rotation control device sends rotation operation information to the control device, the control device sends a corresponding control instruction to the motor driving control device according to the operation information, the motor driving control device controls the rotation motor to operate, the rotation motor drives the lifting arm frame to rotate, and the lifting arm frame drives the lifting hook to rotate; the detecting device detects the acceleration of a lifting hook in real time and sends to the control device; and when a deviation delta a is generated between the acceleration at of the lifting hook received by the control system and a given acceleration a, the control system adjust the operation speed of the rotation motor in real time according to delta a until the real-time detected acceleration at is consistent with the given acceleration a, so that the stable control of the operation speed of the lifting hook is realized, and the anti-swing effect is achieved.

The invention discloses a multi-axis linkage mechanical motion control method, device and system, and a computer readable storage medium. The method comprises the following steps: calculating the total motion time of a target trajectory point according to the total pulse number, the acceleration shape and the speed shape of the target trajectory point when the target trajectory point is interpolated; if the total motion time is not greater than a preset interpolation threshold value, taking the total motion time value as a first-stage interpolation period; if the total motion time is greater than a preset interpolation threshold value, calculating a first-stage interpolation period according to the total motion time and the number of interpolation times; and based on first-stage interpolation period parameter information and a second-stage interpolation period which are obtained through calculation according to the first-stage interpolation period, the acceleration shape and the speed shape, obtaining the output pulse of each axis, wherein the second-stage interpolation period is a fixed microsecond-stage period. The problems that the output frequency of the multi-axis interpolator jumps and the interpolation time cannot be exactly divided by the interpolation period, so that the pulse frequency control is inaccurate are solved, and the control precision of the multi-axis linkage mechanical motion is effectively improved.

The invention provides a bus voltage control method, a controller and a photovoltaic energy storage conversion system, belonging to the technical field of photovoltaic power generation. The method comprises the following steps: firstly judging whether a photovoltaic module is connected with a photovoltaic energy storage conversion system or not under the condition that a preset bus voltage controlcondition is me; if the photovoltaic module is connected with the photovoltaic energy storage conversion system, controlling an energy storage battery to stop working, and stabilizing a direct-current bus voltage by the photovoltaic module; and if the photovoltaic module is not connected to the photovoltaic energy storage conversion system, stopping the charging process of the energy storage battery by taking a preset parameter threshold as a target value. Since the preset parameter threshold value is given based on the sampling error of the photovoltaic energy storage conversion system, whenthe charging process of the energy storage battery is stopped according to the preset parameter threshold, it can be ensured that the charging current of the energy storage battery is greater than orequal to 0, and no negative value condition occurs; and thus, the energy storage battery is prevented from continuously charging a DC bus, the problem of bus voltage rise is avoided, and the stability of the photovoltaic energy storage conversion system is improved.

The invention discloses a twelve-phase three-level H-bridge direct-current side cascade propulsion frequency converter which is formed by cascading the direct-current sides of two six-phase three-level H-bridge propulsion frequency converters, wherein the cascade upper-end propulsion frequency converter is provided with a non-return diode at a direct-current input positive electrode, the cascade lower end propulsion frequency converter is provided with a non-return diode at a direct current input negative electrode; the three-level H-bridge direct-current side cascade topology suitable for direct-current 10kV is developed based on a mature three-level H-bridge topology, and compared with other five-level or modular multi-level topologies, the three-level H-bridge direct-current side cascade topology does not involve an absorption loop or a complex large commutation loop, and is provided with a simple main circuit. The invention further discloses a capacitor voltage balance control method; neutral-point potential adjustment based on zero-sequence voltage injection is adopted; three-level upper and lower H bridges are adjusted through loads; and themethod is easy to implement and does not affect an original control strategy.

The invention provides a volume regulation device and a volume regulation method for an intelligent terminal. The volume regulation device for the intelligent terminal comprises an operation module, adetection module, an analysis module and a volume regulation module; the operation module comprises at least one sensor arranged on the surface of the intelligent terminal and arranged side by side with the sound out hole of the intelligent terminal, and the sensor receives a sliding operation and generates a physical signal; the detection module is connected with the operation module, which converts the physical signal to an electric signal; the analysis module is connected with the detection module, which identifies the movement direction and the movement distance of the moving track and converts the moving distance to a volume regulation value according to a conversion relationship; and the volume regulation module is connected with the analysis module, which receives the volume regulation value and regulates the played volume of the sound out hole. By means of the volume regulation device for the intelligent terminal provided by the invention, when the intelligent terminal is in the lock screen state, the smooth control of the volume can also be achieved; the traditional key operation mode is changed, and the operation choice of the user is enriched.

The invention provides an over-speed and variable pitch coordination-based variable speed wind turbine generator set primary frequency modulation method. The method comprises the following steps of: 1) providing a load reduction operation scheme for an variable speed wind turbine generator set; 2) determining that the variable speed wind turbine generator set operates according to the load reduction operation scheme; 3) judging whether the variable speed wind turbine generator set participates in system frequency modulation; and 4) activating a primary frequency modulation control module to enable the variable speed wind turbine generator set to participate in the system frequency modulation. With the method adopted, changes of the kinetic energy of a wind turbine are fully considered when active spare capacity is reserved, and the output capacity of the wind turbine itself can be effectively utilized; and when power?shortage occurs on a system, and the frequency of the system is decreased, continuous active power support can be provided, and improvement of the stability of the frequency of the power system can be facilitated.

The invention relates to a voltage deviation regulator for an insulation monitoring device, in particular to an insulation monitoring device with the function of voltage deviation compensation. The insulation monitoring device comprises a balance bridge circuit and a compensation circuit; the compensation circuit comprises an anodic compensation triode and a cathodic compensation triode; a collector of the anodic compensation triode is connected to an anode of a direct current bus; an emitter of the anodic compensation triode is connected to a ground wire through a current limiting resistor R3; a collector of the cathodic compensation triode is connected to the ground wire; an emitter of the cathodic compensation triode is connected to a cathode of the direct current bus through a current limiting resistor R4; a base of the anodic compensation triode and a base of the cathodic compensation triode are connected to a changeover switch respectively through a current limiting resistor R5 and a current limiting resistor R6; the changeover switch is connected to a control unit. Deviation of voltage-to-earth of a direct-current system is precisely compensated. The invention further provides a voltage deviation compensation method; current between the collectors and the emitters is smoothly controlled, running safety of the direct current system is guaranteed, and safety hazards are eliminated.

The embodiment of the invention discloses a control method and device of an exhaust gas recirculation control valve, a vehicle, and a medium. The control method of the exhaust gas recirculation control valve comprises the steps that when the operation mode of an engine is switched, an EGR set opening value of the last step length of the exhaust gas recirculation control valve, a current EGR feed-forward opening value and a first EGR opening value corresponding to a P controller are obtained; according to the EGR set opening value of the last step length, the current EGR feed-forward opening value and the first EGR opening value, a second EGR opening value corresponding to an I controller is determined; a current EGR feedback opening value is determined according to the first EGR opening value and the second EGR opening value, a target EGR set opening value is determined according to the current EGR feed-forward opening value and the current EGR feedback opening value, and the target EGR set opening value is equal to the EGR set opening value of the last step length.

The invention provides a low-idle-speed control method and a low-idle-speed control device. The low-idle-speed control method includes acquiring rotation speed of an engine, and increasing an original idle speed setting value as current idle speed setting value if the rotation speed is accordant with preset low idle speed control conditions; controlling the current idle speed setting value to decrease as preset slope which is matched with a rotation decreasing curve of the engine; outputting the idle speed setting value during decreasing to a PI (proportional integral) controller in real time so that the PI controller can control the rotation speed of the engine according to the outputted idle speed setting value. According to the above technical scheme, smooth control of the rotation speed of the engine can be realized, and the technical problems about long regulation period and complicated regulation process due to overregulation in the prior art are solved.

The invention discloses a switched reluctance motor torque ripple and bus current ripple suppression method. According to the method, the flux linkage characteristic and the torque characteristic of the switched reluctance motor need to be obtained through off-line measurement. A total torque reference value is output by a speed proportional-integral controller, and a reference torque value of each phase is calculated by a torque distribution function. And according to the position and current information at the moment k and the position information stored at the moment k-1, calculating flux linkage and current information at the moment k + 1 in combination with an optimal switching vector calculated at the previous moment, and carrying out delay compensation. On the basis, position information at the k + 2 moment and flux linkage current information under an available switching vector are predicted, then a table is looked up to obtain torque and inverter input current values under each switching state, the torque and the inverter input current values are substituted into a cost function, the operation state with the minimum cost function value serves as a switching signal, and the switching signal is applied to a control power converter; therefore, the effect of suppressing the torque ripple and the bus current ripple at the same time is achieved. The effectiveness of the method is verified through simulation, the control logic of the method is simple, the torque ripple and bus current ripple suppression effect is obvious, and the impact of bus current on the supporting capacitor is effectively reduced.