35results about How to "Quick control" patented technology

The application discloses a top-opening drum washing machine inner drum positioning method and a washing machine. The method comprises the following steps: after setting a washing program, the inner drum is controlled to rotate at a preset low speed; the rotation angle of the inner drum is collected and the deviation of the rotation angle from a target angle is calculated; the motor speed is controlled by PID closed-loop regulation with feedforward compensation based on the deviation, wherein the feedforward compensation amount is calculated according to the load weight, the speed fluctuation and / or the deviation change rate; when the deviation is less than a preset threshold, segmented braking is performed until the inner drum is locked at the target angle position; if the locking fails, the inner drum is reversely rotated to a preset angle, and the segmented braking is retried with corrected braking parameters. The application combines PID regulation with feedforward compensation and segmented braking, introduces a failure retry and parameter self-adaptive correction mechanism, and realizes high-precision, impact-free and high-reliability positioning of the inner drum.

The utility model discloses a high -pressure cleaning machine convenient to remove relates to high pressure cleaning utensil technical field, including frame, two cover plates are symmetrically hinged on the frame, and the one side of cover plate is equipped with the positioning bolt for closing, the handle is fixedly connected on the top side wall of frame, and the cleaning assembly is equipped on the bottom side wall of frame, and the connecting pipe is equipped on the top of cleaning assembly, two water tanks are placed symmetrically in the frame, and the connecting pipe is communicated to a water tank, and the communicating pipe is equipped between two water tanks, and the fixed device is equipped at the bottom of frame, the utility model discloses the setting of water spray pipe can improve the cleaning effect, make the ground after cleaning more clean and neat, through the setting of the placement seat, can make water spray pipe when not using orderly place, through the setting of fixed device, can fast, accurate control the position of stop block, make the cleaning machine between fixed and mobile state freely switch, solved the problem of traditional high -pressure cleaning machine manual fixed mode operation laborious, low efficiency, lead to inconvenient movement.

The application provides a capacitor parallel type controllable lightning arrester device, and relates to the technical field of lightning control, which comprises an outer box, two groups of connecting electrodes are fixedly arranged in the middle of the outer box, a lightning arrester group is arranged at the top of the connecting electrodes, and a capacitor is connected to the outside of the connecting electrodes; two groups of positioning templates are arranged, and the two groups of positioning templates are fixedly arranged on the two sides of the inside of the outer box; a slope clamping block is arranged, an automatic on-off control function is provided, the pressure in the hollow electrode strip is gradually increased through the mode of extruding gas, the lowermost air expansion rod is first entered into the lowermost partition support to support the slope clamping block, the slope clamping block is further adhered to the slope clamping block, the sliding contact block is moved, the sliding contact block moves to the positioning template, the sliding contact block is adhered to the spring contact point, the connecting electrode, the capacitor and the hollow electrode strip are connected, rapid control is realized, and the problem that the existing device cannot be gradually automatically connected through integrated unified power is solved.

This utility model belongs to the technical field of vacuum control equipment, and in particular to a fast-response vacuum controller, including a vacuum controller housing, a vacuum controller body, a control panel, and a valve body mechanism. The vacuum controller body is disposed within the vacuum controller housing. A damping shaft is rotatably mounted on the control panel, and a strip block is radially fixedly mounted on the damping shaft. A storage groove is provided on the top side of the vacuum controller housing, and the strip block is mounted on the inner walls of the front and rear sides of the storage groove via damping hinges. The valve body mechanism is disposed within the vacuum controller housing and connected to the vacuum controller body. The valve body mechanism includes a mounting box, a U-shaped plate, two partitions, a guide and reset assembly, a transmission assembly, an electromagnet, and a magnetically made moving plate. This utility model has a reasonable design, can quickly respond to operation commands, improve execution efficiency, and optimize the operation interface to enhance ease of use and storage.

The application discloses a stirring system, which solves the technical problem of complex pipelines in a plant for preparing high-pressure polyethylene at present. The stirring system comprises a stirring mechanism, a pipeline integration mechanism and a control mechanism. The stirring mechanism comprises a stirring tank and a plurality of first pipelines arranged in the stirring tank. The pipeline integration mechanism comprises a support main body and a plurality of pipeline groups arranged in the support main body. Each pipeline group comprises at least one second pipeline and at least one valve. Each first pipeline is connected with one pipeline group. The valves of different pipeline groups are opened and closed, so that fluid medium can flow into the stirring tank from the corresponding pipeline group or flow out of the stirring tank from the corresponding pipeline group. The application can reduce the complexity of pipelines in a workshop and improve work efficiency.

This application belongs to the field of DC bus voltage control, specifically disclosing a super-spiral sliding mode active disturbance rejection control method based on an RBF neural network, including the following steps: establishing a mathematical model of a bidirectional Buck / Boost circuit; designing an active disturbance rejection controller, which includes a tracking differentiator and an extended state observer; using an RBF neural network to dynamically optimize the gain parameters of the extended state observer in real time; constructing a super-spiral integral sliding mode controller to replace the nonlinear state error feedback loop in the active disturbance rejection controller; calculating a current reference signal based on the output signal of the tracking differentiator and the observation signal of the extended state observer through the super-spiral integral sliding mode controller; generating a drive signal based on the current reference signal to control the bidirectional Buck / Boost circuit to maintain the stability of the DC bus voltage. This application can effectively improve the stability and disturbance rejection capability of the DC microgrid bus voltage.

The application discloses a servo cut-off valve group, which comprises a first valve body and a second valve body integrated on a valve seat. Both the valve bodies are provided with valve cavities, and the valve cavities are internally provided with valve spools driven by a servo motor through a screw rod. The valve bodies are provided with outer ring channels communicated with inlet and outlet of the valve seat on the side surfaces, the outer ring channels are communicated with the valve cavities through a plurality of uniformly distributed lateral flow channels, and the inner walls of the valve cavities are further provided with inner ring channels. The longitudinal flow channels at the bottoms of the two valve cavities are communicated with each other through channels in the valve seat. When the two valve spools synchronously rise above the lateral flow channels, fluid can sequentially pass through the flow channels, and the valve is opened; when the two valve spools synchronously descend to completely cover the lateral flow channels, the valve is closed. The two valve cavities are communicated at the bottoms to form a pressure balance cavity, so that the valve spools are hardly subjected to axial thrust when the valve is closed, and high pressure is converted into sealing force in the radial direction of the valve spools, thereby fundamentally solving the high pressure leakage problem of traditional cut-off valves, and the application is especially suitable for high pressure equipment such as filter presses.

The utility model provides an artificial intelligence control device for the operation process of a water transportation port. The artificial intelligence control device has various advantages. The positioning holes provide accurate reference for device installation, and installation efficiency and quality are improved; the water transportation port is used for controlling the connecting port and the nickel-plated jack, so that stable and reliable connection, corrosion resistance and water resistance are guaranteed. The APM processor can be controlled to quickly process sensor data, real-time accurate control is achieved, and the operation automation level is improved. And the data storage stores related data, so that subsequent analysis and operation optimization are facilitated. And the wireless communication module is controlled to realize remote monitoring and control, so that the management cost is reduced. The device adopts a multiple waterproof sealing structure, prevents moisture and dust from invading, protects an internal circuit, and ensures stable data transmission. Through real-time monitoring and accurate control, operation parameters can be adjusted according to actual conditions, the safety, efficiency and resource utilization rate of port operation are improved, the cost is reduced, and the overall competitiveness is improved.

The utility model relates to the field of control, in particular to a console convenient to maintain, which comprises a console body and a movable device. The console body comprises a supporting frame, an operation platform and an operation wall plate, wherein the operation platform and the operation wall plate are installed on the supporting frame. The operation wall plate is arranged on one side of the operation platform. A maintenance opening is formed in the operation wall plate; the movable device comprises a supporting mechanism and a moving mechanism, the supporting mechanism comprises a supporting seat used for supporting equipment, and the supporting seat and the maintenance opening are correspondingly arranged; the moving mechanism comprises a fixed seat and a movable mechanism, and the fixed seat is fixedly mounted on the supporting frame; and the supporting seat is movably connected with the fixed seat through a movable mechanism, so that the supporting seat is close to or far away from the operating platform. According to the utility model, the maintenance efficiency is improved, and the control efficiency is ensured.

The utility model relates to the technical field of dryer manufacturing, and discloses a boiling dryer with a particle recovery function, which comprises a storage box, the bottom of the storage box is slidably connected with an air-drying tank, the outer side of the air-drying tank is rotatably connected with a fixing column, the outer side of the fixing column is fixedly connected with a plurality of limiting blocks, and the limiting blocks are fixedly connected with the air-drying tank. A fixing column is fixedly connected to the top of the storage box, a sliding column is slidably connected to the outer side of the fixing column, a sealing shell is fixedly connected to the interior of the sliding column, a filtering tank is slidably connected to the top of the storage box, a clamping assembly used for clamping parts is fixedly connected to the interior of the filtering tank, and a plurality of clamping grooves are formed in the sliding column. According to the utility model, a worker only needs to sleeve the sliding column on the outer side of the fixed column, rotate the fixed column to enable the limiting block to be clamped into the specific position of the clamping groove and release the sliding column, so that the sealing butt joint can be completed, complicated operation procedures and tools are not needed, and the working efficiency can be greatly improved.

The utility model relates to the technical field of die bonders, in particular to a die bonding mechanism, which comprises an adjusting assembly, a ZR motor fixed on the adjusting assembly, a die bonding arm fixed at the position of the output end of the ZR motor, an adsorption assembly rotatably mounted on the die bonding arm, and a fixing assembly fixed at the position of the output end of the ZR motor, the output end of the ZR motor drives the adsorption assembly to rotate on the die bonding arm, and the ZR motor can drive the vertical movement of the die bonding arm and the rotation of the adsorption assembly at the same time, thereby simplifying the overall structure of the die bonding mechanism, reducing the mechanical inertia, and more accurately controlling the vertical position of the die bonding arm and the rotation angle of the adsorption assembly. Therefore, the positioning of the wafer in the adsorption, transfer and placement process is more accurate, the die bonding quality and the product yield are improved, the position of the adsorption assembly connected with the adjusting assembly can be finely adjusted by the adjusting assembly, different die bonding process requirements and working scenes are adapted, and the die bonding mechanism has higher universality and flexibility.

The utility model discloses a knife length fixer for a thermosetting knife handle, which relates to the technical field of knife installation of the thermosetting knife handle and comprises a cylindrical sleeve, a plurality of first strip-shaped grooves are downwards formed in the top edge of the sleeve, and a plurality of second strip-shaped grooves are upwards formed in the bottom edge of the sleeve. The first strip-shaped grooves and the second strip-shaped grooves are evenly distributed along the circumference of the sleeve at intervals and arranged in the axial direction of the sleeve, the length of the first strip-shaped grooves is larger than that of the second strip-shaped grooves, the width of the first strip-shaped grooves is the same as that of the second strip-shaped grooves, and the sum of the length of the first strip-shaped grooves and the length of the second strip-shaped grooves is larger than the height of the sleeve. A second strip-shaped groove is formed between every two adjacent first strip-shaped grooves, and a first strip-shaped groove is formed between every two adjacent second strip-shaped grooves. The device is simple in structure and safe to use, the cutter length can be simply and quickly controlled, the cutter can be quickly mounted, mounting of one cutter saves at least 10 minutes compared with a traditional method, production efficiency is improved, and a cutter handle for mounting the cutter can be mounted in a lossless mode.

The utility model relates to a kind of shot blasting machine discharging device, including discharging bin, and the upper part of the top and bottom of discharging bin is equipped with upper material port and lower material port respectively, and the side of discharging bin is equipped with observation window.The first baffle of manually pulling out and inserting is configured below upper material port to control the opening and closing of feeding, and the second baffle extending to the rear end of bin body is arranged above lower material port, and the movable end of the baffle is connected with the pneumatic valve outside bin.The extension length of pneumatic valve can be controlled by motor, the covering range of second baffle to lower material port can be accurately adjusted, and then the fine and rapid control of shot blasting machine shot supply flow is realized.

This invention relates to the field of electrolysis process control technology, and particularly to a method and system for preventing over-temperature control of the deaerator in a water electrolysis hydrogen production purification system. The method includes: acquiring monitoring data of the electrolyzer's operating status and oxygen content monitoring data at the deaerator inlet; performing logical judgment calculations on the electrolyzer's operating status monitoring data based on a preset set of disturbance parameter thresholds to obtain a feedforward control signal; performing deviation calculations and feedback control algorithm calculations on the oxygen content monitoring data based on a preset first oxygen content threshold to obtain a feedback control signal related to the preset threshold; and performing control logic operations based on the feedforward and feedback control signals to generate control commands. This approach solves the technical problem of response lag in existing deaerator temperature control technologies, improving the control quality, equipment safety, and operational reliability of alkaline water electrolysis hydrogen production systems under complex operating conditions.

The touch type intelligent dimming LED wall lamp comprises an installation frame, a wall lamp base fixed to the installation frame and a supporting arm fixed to the wall lamp base, a lamp body is fixed to the supporting arm, and the lamp body comprises an arc-shaped lamp base, a light source plate, a control circuit board, a touch sensor and a light guide cover; a concave cavity with an opening in the top surface is formed in the arc-shaped lamp holder, and mounting support lugs are integrally formed on the upper part of the inner wall of the concave cavity; the control circuit board is located in the concave cavity, and the touch sensor is fixed to the lower portion of the front face of the arc-shaped lamp holder and connected with the control circuit board. The light source plate is arranged in the concave cavity and fixed to the mounting supporting lugs through screws, and the light guide cover is located on the top of the arc-shaped lamp holder. The LED lamp is reasonable in structural arrangement, the light source plate and the light guide cover can be rapidly installed, the control circuit board can be conveniently installed and used, touch control operation can be achieved through the touch sensor, control convenience and effectiveness are improved, disassembly, assembly and maintenance operation can be conveniently carried out through the body structure, and the decoration effect can be improved.

This invention relates to a microtube for controlling droplet motion and a method for optically controlling droplet motion. The microtube comprises a microtube and a polypyrrole membrane distributed in a grid pattern on the outer surface of the microtube. A droplet is injected into the microtube, and the droplet motion is controlled by irradiating the polypyrrole membrane with a light source. The invention features a simple preparation method, eliminating the need for complex fabrication processes. The droplet control principle is straightforward, and the control method offers high reusability. It eliminates the need for complex and large optical devices and enables rapid and precise droplet control even with low light intensity. Furthermore, the droplets are not easily contaminated by the external environment. This invention can control not only different types of droplets but also achieve complex droplet motions, demonstrating significant application potential in the biological field.

The invention provides an observation desk for pathological analysis and diagnosis, and relates to the field of pathological analysis equipment. The observation table for pathological analysis and diagnosis comprises a table top plate, the two sides of the bottom of the table top plate are sequentially and fixedly connected with a supporting plate and a containing box in the left-right direction, a containing frame is arranged on the left side of the bottom of the table top plate, and a square groove used in cooperation with the containing box is formed in the right side of the top of the table top plate; a square groove is formed in the base, a supporting frame is arranged in the square groove in a sliding mode, a transverse plate is transversely and fixedly connected to the top of an inner cavity of the supporting frame, a hiding assembly is arranged at the bottom of the transverse plate, and an adjustable auxiliary assembly for conducting auxiliary positioning on the microscope is arranged on the hiding assembly. According to the microscope base fixing device, microscope bases of different sizes can be adsorbed and fixed in real time according to actual use requirements, the fixing state can be quickly released, a user can conveniently maintain or repair a microscope, and the overall applicability of the device is improved.

The utility model discloses an agricultural weeding machine, which relates to the field of agricultural weeding machines and comprises a traveling mechanism and a weeding mechanism which are mounted on a frame. The walking mechanism comprises a pair of walking wheels, the two walking wheels are rotationally installed and connected to the front end of the rack through a rotating shaft, and the rotating shaft is driven to rotate through a first driving structure installed on the rack; the weeding mechanism comprises a weeding blade, the weeding blade is connected to the support through a rotating shaft of a driving shaft, the driving shaft is driven to rotate through a second driving structure installed on the rack and drives the weeding blade to rotate for weeding, and the support is installed and connected to the end, away from the walking wheel, of the rack. The weeding machine is mainly used in flat hilly areas, overcomes the defect that a small weeding machine is inconvenient to walk in the'hollow 'land in the hilly areas, and can replace a large weeding machine to quickly achieve the weeding function, so that resource waste caused by the adoption of the large weeding machine is avoided.

The high-temperature-resistant and high-pressure-resistant integrated self-sealing ball valve comprises a ball valve body, a control ball is rotatably connected to the interior of the ball valve body, an inner rotating shaft is fixedly connected to the upper portion of the control ball, an outer rotating shaft is rotatably connected to the interior of the upper side of the ball valve body, and a lifting groove is formed in the outer rotating shaft; the outer side of the upper portion of the inner rotating shaft is slidably connected with a rotating cover, the rotating cover is slidably connected into the lifting groove, the upper portion of the outer rotating shaft is fixedly connected with a first fixing piece, the interior of the first fixing piece is in threaded connection with a threaded rod, the lower portion of the threaded rod is rotatably connected with a lifting piece, and the lifting piece is slidably connected to the outer side of the outer rotating shaft. A tooth ring is fixedly connected to the lower portion of the lifting piece, a tooth groove matched with the tooth ring is formed in the upper portion of the ball valve, it is guaranteed that the valve rod can be kept stable when operation is not needed, and misoperation is prevented.

The application discloses a state coupling sliding mode control method and system of an underactuated electric heating system, relates to the cross technical fields of electric heating engineering, thermal system modeling and intelligent control, and comprises the following steps: constructing an electric heating system dynamic model comprising a quartz lamp temperature state, a test piece temperature state and a quartz lamp control input; based on a test piece temperature dynamic equation and a preset test piece temperature reference track, constructing a sliding mode function taking a test piece temperature tracking error and a time derivative as variables; deriving the constructed sliding mode function and combining the quartz lamp temperature dynamic equation and the test piece temperature dynamic equation to establish a direct mapping relationship between a sliding mode dynamic and a control input; designing a second-order sliding mode control law, introducing an auxiliary state and constructing a continuous second-order sliding mode reaching law, and inversely deriving the quartz lamp control input according to a linear algebra relationship. The method has clear control structure, clear physical meaning and strong engineering implementation, and is suitable for temperature control of a quartz lamp electric heating system under complex working conditions.

This invention provides a warm acupuncture device with temperature control, belonging to the field of warm acupuncture technology. It includes acupuncture needles, a fixed tube, a movable tube, a fixed groove, a fixed crossbar, an upper connecting rod, and an inclined rod. The invention utilizes a movable tube, a mounting frame, a fixed groove, and a pressing plate. By pressing the lower end of the pressing plate inward, the clamping block penetrates the fixed tube, releasing the acupuncture needle. At this point, the movable tube and mounting frame can be lifted upward, separating the acupuncture needle from the moxa stick and reducing the needle's temperature. This achieves direct and rapid temperature control by allowing the acupuncture needle to contact and separate from the burning moxa stick. This solves the problem of existing warm acupuncture temperature control devices that regulate temperature by controlling the number of vents, which is slow and affects treatment effectiveness. Furthermore, the acupuncture needles inserted into the skin, bearing a large load, are not stable enough when supported solely by the needles. Additionally, ash can fall from the vents of the container holding the burning moxa stick, potentially burning the patient.

The utility model relates to a kind of temperature control type AD converter testing device, it includes: test fixture body, for installing AD converter to be detected;Cooling assembly, including the cooling plate being set in test fixture body bottom and the cooling module being set with cooling plate adhesion, several cooling channels are connected in parallel inside cooling module, several cooling channels are respectively communicated with inlet manifold and liquid-collecting manifold, and the cross section of each cooling channel gradually increases along the flow direction of cooling liquid;The side of cooling plate facing AD converter to be detected is heat conduction contact surface, and heat coupling is formed with the heat dissipation side of AD converter by heat conduction interface material;Temperature control structure, with inlet manifold and liquid-collecting manifold are communicated to form cooling liquid circulation passageway, for adjusting the temperature and / or flow of cooling liquid to maintain set temperature;Test module, with AD converter to be detected electric connection.

The utility model discloses a condensing device for water reducing agent processing belongs to water reducing agent processing technical field. The utility model is provided with cold -draf machine and cooling water tank respectively in the both sides of reation kettle, and the inside of reation kettle is provided with cold gas ring pipe and cooling rotary pipe, and through three -fold cooling path cooperation, and cold -draf machine injects cold air directly into water reducing agent inside through the exhaust port of vertical pipe, and cold air is contacted directly with material, and utilizes heat exchange to take away heat quickly, and the inside of cooling rotary pipe is kept low temperature through cold air, and rotates and stirs under the driving of motor, expands low temperature contact surface, and passes through stirring and accelerates heat transfer in material inside, and the cooling medium of cooling water tank flows around outside reation kettle, forms the barrier of " external heat preservation + cooling", reduces the heat interference of external environment to inside, takes away the heat of reation kettle wall conduction simultaneously, can control water reducing agent temperature in target range quickly, avoids the change of material property because of slow cooling.

The utility model discloses a special carriage flame-retardant board edge sawing device with a protection mechanism, and relates to the technical field of special carriage flame-retardant board edge sawing devices, the special carriage flame-retardant board edge sawing device comprises a bearing frame, a first connecting rod, a limiting block, a bearing table and a traction disc, a cutting tool bit is installed on the side face of the bearing frame, and a cutting frame, a motor and a lead screw are arranged on the side face of the cutting tool bit; a limiting block and a spring are arranged below the center line of the bearing frame, a bearing table is installed above the bearing frame, a protection ring, a first connecting rod, a second connecting rod and a traction disc are arranged on the side face of the bearing frame, a pressing plate is arranged above the protection ring, and the protection ring is annular and can effectively isolate the range where people get close. And meanwhile, the protective ring physically isolates the cutting tool bit, and damage caused by accidental touching of the cutting tool bit is avoided.

The invention provides a crankcase ventilation control method and a vehicle, the method is applied to a crankcase ventilation control system, and a crankcase in the system communicates with an air inlet unit through an air supplementing pipeline; an air supply valve is arranged on the air supply pipeline; the method comprises the steps that the hydrogen concentration in a crankcase is determined based on the obtained engine rotating speed and output torque; in response to the fact that the hydrogen concentration in the crankcase is larger than or equal to a preset concentration value, the gas supply opening degree of a gas supply valve is determined; and the opening degree of a gas supplementing valve is adjusted to the gas supplementing opening degree, so that the hydrogen concentration in the crankcase is reduced to be lower than a preset concentration value. By controlling the opening degree of the air supply valve, the air supply amount entering the crankcase is effectively controlled, namely, the hydrogen concentration in the crankcase can be rapidly controlled within a reasonable range, and the explosion risk is avoided.

The utility model relates to mechanical connecting device technical field especially is one button control's universal head device, it includes connecting branch, top block, the universal ball head of activity setting in the front end of connecting branch, install one button control subassembly in connecting branch arm and install in the abutting assembly of connecting branch arm, top block slidingly arranged in the front end of connecting branch arm, the front end of top block is used for with the universal ball head abuts, and abutting assembly is used for pushing top block and holds the universal ball head, one button control subassembly includes key main body, transmission part, reset part and lever part. The utility model provides one button control's universal head device for the prior art problem, and the structure is novel, and one button realizes locking / unlocking, replaces traditional multistep operation, solves the problem of traditional operation difficulty, is favorable for promoting the regulation efficiency, the utility model realizes the quick control of universal ball head through mechanical linkage, especially is applicable to the scene that needs frequent angle regulation.

This utility model discloses a cableway-type river flow measurement device, including a main column and a secondary column fixed on both sides of the river channel, a traveling cableway and a traction cableway matchedly arranged between the main column and the secondary column, and a measuring trolley that can move back and forth along the traveling cableway driven by the traction cableway. A radar level gauge is fixedly installed at the bottom of the measuring trolley, and a winch mechanism is mounted on the measuring trolley. A measuring part is fixedly installed at the end of the hoisting rope of the winch mechanism. The measuring trolley is equipped with a first battery pack for driving the winch motor of the winch mechanism, and a first solar panel for storing energy from the first battery pack is installed on the top. In terms of cableway design, this device adopts an innovative approach of separating the traveling cableway and the traction cableway. By controlling the forward and reverse rotation of the traction cableway, the reciprocating movement of the measuring trolley above the river channel is achieved.

The application discloses an electronic differential pressure flow switch, which comprises the following steps: an electronic flow differential pressure switch is in communication connection with a main control system, the main control system is in communication connection with an LED panel, and exhaust pipe temperature and exhaust pipe differential pressure values detected are displayed on the LED panel; and the main control system is also in communication connection with an ignition switch and an alarm, differential pressure data of the exhaust pipe are acquired through a thermal flow differential pressure sensor, the differential pressure data are analyzed through overall comprehensive analysis and then through time and space dimensions, respectively, to determine whether a fan or the exhaust pipe is faulty; and the differential pressure data are used to calculate a maintenance coefficient of the fan and the exhaust pipe, and according to the maintenance coefficient, a staff member can quickly handle and maintain.

The invention relates to the technical field of engineering machinery, and provides an aerial work platform and a control method thereof.The aerial work platform comprises a motor, an electronic pump, a valve set, a vehicle control unit and a motor controller, and the vehicle control unit is used for obtaining a user action instruction and the pressure of a pressure signal feedback port of the valve set and judging the action type according to the user action instruction; and the motor controller is used for controlling the displacement of the electronic pump and the rotating speed of the motor according to the output port pressure of the electronic pump, the pressure signal feedback port pressure of the valve group and the action type. The optimal rotating speed and displacement can be matched for the motor and the pump, control signals are completely based on electronic signals, the environment interference resistance is high, the main control mode is integrated in the motor controller, the response is faster, the composite action and the single action are separated, direct flow control is adopted for the single action, the throttling loss is greatly reduced, and the control efficiency is improved. Load sensitivity and displacement control are adopted for composite action, and throttling loss can be reduced under some working conditions.

The invention discloses a model prediction control method and system for a totem-pole PFC circuit, and belongs to the technical field of totem-pole PFC circuits, and the method comprises the steps: monitoring the input voltage of an AC power supply, the bus voltage of the totem-pole PFC circuit, and load demand information in real time; determining that the totem-pole PFC circuit works in a boost mode or a voltage-multiplying mode and driving signal distribution logic of each switch tube in the bridge circuit; calculating an optimal modulation ratio based on a model prediction control algorithm according to an error between the target bus voltage and the currently detected bus voltage; generating a first SPWM signal with a corresponding duty ratio and a complementary second SPWM signal according to the optimal modulation ratio; and distributing the first SPWM signal and the second SPWM signal to corresponding switch tubes to realize control of the bus voltage. According to the method, the SPWM duty ratio is dynamically adjusted through model prediction control, and rapid, accurate and stable control over the totem pole PFC bus voltage is achieved.