109results about How to "Fast dynamic response" patented technology

The invention discloses a high-efficiency converter for adjusting the voltage of a power grid, and belongs to the technical field of power electronics. The converter comprises a first voltage regulation circuit, a second voltage regulation circuit, a filter circuit, a detection circuit and a control circuit. By detecting the amplitude difference between the power grid voltage and the load voltage, the control circuit automatically switches the Buck working mode or the Boost working mode, and stable alternating current output in a wide input voltage range is achieved. The invention has the advantages of compact structure, high efficiency, fast response, small harmonic wave and the like, and is suitable for industrial and civil occasions with large-range fluctuation and frequent power grid voltage.

The invention discloses a matrix type temperature detection system and method based on temperature-sensitive diodes, the problems of complex wiring and large temperature drift of a traditional multi-node temperature measurement system are solved through M * N matrix layout, row and column time-sharing gating and constant current driving technologies, the system adopts an independent column constant current source to ensure the measurement consistency, and a high-precision ADC and a dynamic calibration algorithm are combined, so that the measurement accuracy is improved. And the precision of + / -0.2 DEG C is realized within the range of 50-150 DEG C. The method is particularly suitable for high-density temperature measurement scenes such as battery thermal management, electronic equipment overheating monitoring and the like.

The invention discloses an unbalance compensation method and system for an energy storage converter, and belongs to the field of power electronics and electric energy quality treatment. The system comprises a power instruction analysis module, a current reference generation module, a negative sequence current control loop module, a zero sequence control loop module, a positive sequence control loop module, a pulse width modulation module, a first conversion module and a second conversion module, the current reference generation module is respectively connected with the negative sequence current control loop module and the positive sequence control loop module; the third end and the fourth end of the negative sequence current control loop module are connected with the pulse width modulation module through the second conversion module; the third end and the fourth end of the zero sequence control loop module and the third end and the fourth end of the positive sequence control loop module are connected with the pulse width modulation module through the first conversion module. According to the method, the energy storage and compensation functions of the PCS can be seamlessly integrated under a unified control framework, so that the control system is greatly simplified, and the performance is remarkably improved.

This invention relates to the field of industrial unmanned aerial vehicle (UAV) technology, specifically a hydrogen fuel cell and lithium battery hybrid UAV. The UAV includes a fuselage, a high-pressure hydrogen storage tank fixedly mounted on top of a gas cylinder mounting base, a battery stack mounted on the bottom of a mounting frame assembly, and a circuit control module located inside the mounting frame assembly. This hydrogen fuel cell and lithium battery hybrid UAV, based on multi-source data fusion and a sliding window anti-disturbance design, achieves accurate identification of all operating conditions, including steady-state cruise, high-power transients, surplus recharge, and regenerative braking. It is equipped with a differentiated intelligent power allocation algorithm, enabling a dynamic allocation strategy that allows for continuous and stable main power supply from the fuel cell during cruise, coordinated lithium battery replenishment during high-power conditions, and real-time recharge of the lithium battery with surplus power. Through a power change rate feedforward compensation design, it maximizes the utilization of the high energy density of hydrogen energy while simultaneously achieving energy recovery and reuse, further improving the system's energy utilization rate.

The application provides a method, device and equipment for suppressing pressure ripple of an injection molding machine, and relates to the technical field of pressure control of an injection molding machine. The method comprises the following steps: collecting pressure feedback signals and angular frequencies of the injection molding machine in a preset time period during a pressure maintaining stage, and extracting an alternating pulsation component according to the pressure feedback signals. The instantaneous phase and the instantaneous amplitude of the alternating pulsation component at the current time are determined. A compensation phase is generated according to a preset physical delay time, the instantaneous phase and the angular frequency. A feedforward compensation instruction is generated according to the instantaneous amplitude and the compensation phase. The feedforward compensation instruction is superimposed on a reference control instruction to generate a total control instruction, which is output to a hydraulic actuator. The feedforward compensation instruction is used to offset the pressure ripple generated in the pressure maintaining stage. The method can improve the pressure control precision in the injection molding pressure maintaining stage.

The invention provides an anti-interference control method for the concentration of a main reactant in a continuous stirring reaction kettle process, belongs to the technical field of chemical process control, and solves the problem that in the chemical process of producing cyclopentanol by catalyzing electrophilic water with cyclopentadienoic acid, the concentration of the main reactant is not influenced. The technical problem that the concentration of a main reactant is difficult to track a set value without steady-state errors under the conditions of fluctuation of feeding concentration, uncertainty and external disturbance of the continuous stirring reaction kettle is solved. According to the technical scheme, the method comprises the steps of constructing a model pre-estimation compensator and an anti-interference control structure, designing a four-dimensional decision model, carrying out parameter collaborative optimization by adopting a multi-target genetic optimization algorithm, and carrying out optimal solution selection based on a TOPSIS method. Under the condition of feed concentration fluctuation, the dynamic response speed and the anti-interference capability of the system can be remarkably improved, and faster adjustment time, smaller overshoot and stronger robustness can be realized in linear and nonlinear models.

The utility model discloses an electromagnetic heating hot melting device, including the electromagnetic coil support, high frequency electromagnetic induction coil is wound on the electromagnetic coil support for producing high frequency alternating magnetic field under the action of high frequency pulse current, nozzle, the nozzle sets up in the magnetic field action area of high frequency electromagnetic induction coil for generating eddy current and spontaneous heating through electromagnetic induction. The utility model discloses adopts electromagnetic induction eddy current heating principle, and the heat is directly generated in the nozzle inside, and does not need traditional heat conduction process, realizes the rapid temperature rise of second level, and the printing preparation time is greatly shortened.

The application discloses a non-magnetic ring proportional pressure reducing electromagnetic valve for a hydraulic system, a first through hole, a second through hole and a first blind hole are formed in the valve body, a pressure relief hole and a pressure inlet hole are formed in the side wall of the valve body, the pressure relief hole and the pressure inlet hole are communicated with the first through hole, a working hole is radially formed in the side wall of the valve body, the inner end of the working hole is communicated with the first through hole, and the outer end extends to the outer surface of the valve body, a valve core is axially movably installed in the first through hole, and a fifth outer groove and a first annular protrusion are arranged on the outer periphery of the valve core, the first annular protrusion forms an annular gap with the inner wall of the first through hole, a coil assembly is arranged in the yoke, a stop iron is fixedly arranged in the yoke through a mounting plate, and a magnetic circuit optimization structure is arranged on the outer surface of the stop iron. The magnetic circuit optimization and the multiple anti-sticking and friction-reducing designs are integrated, the independent magnetic ring is cancelled, the structure is simplified, the electromagnetic force, the response speed and the service life of the electromagnetic valve are comprehensively improved, the processing difficulty is obviously reduced, and the application range of the electromagnetic valve is widened.

The application discloses a kind of doubly-fed asynchronous motor propulsion system grid-side converter control method and system, method includes: the actual value of DC bus voltage is collected and compared with reference value to obtain voltage error, based on error and its change rate construct discrete sliding surface, generate with the active power reference value matched with voltage stability demand;Based on the discrete prediction model of active and reactive power of grid-side converter mathematical model, construct the cost function with the power reference value as the target to track and realize unit power factor, determine the optimal switching state of grid-side converter in each control cycle by rolling optimization;The optimal switching state is converted into driving signal and directly acts on converter power switch device.The application replaces traditional PI control and SPWM modulation, significantly improves the dynamic response speed of system, anti-interference ability and parameter adaptability, effectively guarantees the stable and efficient operation of electric propulsion system under complex working conditions.

The application discloses a permanent magnet synchronous motor rotating speed ring control method and device, medium and equipment, relates to the permanent magnet synchronous motor control technical field.The application first realizes accurate real-time estimation on the load torque by using a supercoil sliding mode load observer, then on-line self-adapting adjustment of the sliding mode controller parameters is realized according to the real-time rotating speed and load torque working condition based on a pre-trained neural network model, and finally the rotating speed is accurately controlled through the sliding mode controller after parameter adjustment.The application effectively solves the influence of load disturbance on the system performance, realizes self-adapting adjustment of the sliding mode controller parameters based on the working condition through the neural network model learning of the applicable relationship between the real-time rotating speed and load torque working condition and the sliding mode controller parameters, overcomes the defects that the traditional sliding mode control parameters are difficult to set, and significantly improves the rotating speed tracking precision, dynamic response speed and overall stability of the system of the permanent magnet synchronous motor under complex working conditions.

The application discloses a kind of adaptive compensation method and related device for three-phase current imbalance and harmonic, belong to power system technical field;The method is based on the instantaneous reactive power theory and the quick separation and instruction generation of fundamental wave positive sequence component and unbalance compensation component of sliding discrete fourier transform;Multi-objective model predictive current control with embedded repeated learning correction mechanism to achieve high-precision tracking of compensation current instruction and system circulation suppression;Multi-objective weight factor online dynamic adjustment mechanism based on fuzzy reasoning, according to the adaptive balance between the control emphasis of tracking accuracy, circulation suppression and switching loss according to the real-time operating state of the system;And, adaptive closed-loop management architecture based on the above module cooperation, drive active power electronic converter to generate compensation current, realize the comprehensive management of three-phase imbalance and harmonic and global optimization of system performance.

The invention belongs to the technical field of nanometer measurement and control, provides a multi-mode cooperative force control method for contact mode scanning of an atomic force microscope, and aims to extract contact state information in real time by carrying out drift and aberration compensation on a measurement signal so as to realize multi-mode cooperative force control. Combined self-adaptive setting of control parameters is carried out in combination with sample morphology characteristics and error signal statistical characteristics, and undisturbed switching between a steady state controller and a transient state controller is realized, so that stable, rapid and low-noise force tracking control is realized in samples with different rigidities and changing noise environments. And the stability and the imaging quality of AFM contact mode scanning are obviously improved. According to the invention, adaptive force control on samples with different rigidities and complex shapes is realized, and the scanning stability and imaging quality of the contact mode atomic force microscope are remarkably improved.

The invention discloses a temperature control device and method of a semiconductor cooler and a laser device. The temperature control device of the semiconductor cooler comprises a semiconductor cooler driving circuit, a temperature control circuit and a temperature control circuit, wherein a driving signal output end of the semiconductor cooler driving circuit is connected with the semiconductor cooler; the output end of the temperature adjusting circuit is connected with the semiconductor cooler driving circuit, and the temperature adjusting circuit is used for sending an adjusting signal to the semiconductor cooler driving circuit according to the temperature of the semiconductor cooler. In this way, the laser temperature control effect can be improved.

The utility model relates to wind power generation technical field discloses wind power generation device, including support subassembly, wind wheel subassembly and power generation subassembly, wind wheel subassembly includes main shaft and impeller, and the main shaft fixed mounting is in support subassembly, and the impeller rotatablely installs on the main shaft, power generation subassembly includes first power generation unit and second power generation unit, and the stator of first power generation unit and second power generation unit all fixed mounting is in main shaft, and the outer rotor of first power generation unit and second power generation unit all are connected with the impeller fixedly, the utility model under the same wind force condition, first power generation unit and second power generation unit can work simultaneously, and the mechanical energy of impeller capture is more efficient, more fully converts into electric energy, effectively increases the overall power generation, improves the wind energy utilization efficiency and power generation efficiency, solves when the outside wind speed is at the low level, and the overall power generation of generator is insufficient.

This invention relates to a constant pressure control system for an optical cavity based on pump-valve coordination and water immersion sensing, and its active protection method. Belonging to the fields of precision instrument control and industrial automation, the system integrates an electronically controlled proportional valve and an air pump through a pump-valve coordinated pressure control unit. It dynamically adjusts the intake and exhaust flow rates based on an adaptive PID algorithm and a coordinated allocation function, achieving high-precision, rapid, bidirectional adjustment of the optical cavity pressure. Simultaneously, it employs a dual environmental sensing unit including visual perception and capacitive liquid level sensing, which executes constant pressure control and active anti-intrusion monitoring in parallel through an intelligent coordinated control unit. When visual detection identifies a risk of water intrusion, the system proactively limits the pump speed; when the capacitive sensor detects liquid water intrusion, it immediately executes an emergency shutdown. This solves the problem of difficulty in coordinating pressure control and safety assurance in traditional technologies, achieving a unified approach of long-term precise constant pressure and active contamination protection, significantly improving the system's reliability, safety, and intelligence level under complex operating conditions.

The invention relates to the technical field of power electronics, in particular to a control method and system for a self-adaptive fixed-time sliding mode control Buck converter, and the method comprises the following steps: building a Buck converter system model which adopts a double-closed-loop control structure to enhance the dynamic response and stability of the system; establishing a Buck converter state-space equation, and considering the influence of uncertain factors and external interference of the system; designing a sliding mode surface, and performing effective approximation on comprehensive uncertainty in the system by adopting a variable-index adaptive fixed-time sliding mode control method to form an improved control law; using an improved control law, taking the output of the voltage loop as the reference inductive current of the current loop, comparing the reference inductive current with the actual feedback current, and obtaining the error of the current loop; according to the error, accurate control of the Buck converter is realized by adjusting a control signal. According to the invention, the control structure is simplified, the convergence speed is improved, and the robustness and rapidity of the system are enhanced.

This invention relates to a high-voltage, capacitor-free, low-noise linear regulator. It comprises a high-voltage switching voltage follower, a self-zeroing error amplifier, and voltage divider resistors. The high-voltage switching voltage follower significantly enhances the system's transient response to load changes and improves power supply rejection in the mid-frequency range. The self-zeroing error amplifier, together with the high-voltage switching voltage follower, forms a global slow loop. The self-zeroing error amplifier employs a ping-pong self-zeroing method, effectively reducing low-frequency flicker noise and offset while ensuring continuous operation in the time domain. This invention introduces a settling phase between the self-zeroing and amplification phases of the ping-pong module, significantly reducing output glitches caused by amplifier settling time. This invention operates stably without an external output capacitor, supports a wide input and output voltage range, and possesses excellent characteristics such as low noise, high power supply rejection, and fast response, making it suitable for various demanding high-voltage power supply applications.

The application is a kind of vector control circuit and method of permanent magnet synchronous shaft motor based on AC phase shift. The application relates to the technical field of permanent magnet synchronous shaft motor vector control, and can perform vector control on the permanent magnet synchronous shaft motor. The three-phase AC power passes through the above controllable phase shifter, and through the conduction and shutdown of the corresponding thyristor switch, six different phase shifts can be generated. According to the average value equivalent principle, the appropriate phase shift is selected, the most ideal stator voltage synthesis vector is obtained, and the vector control of the permanent magnet synchronous shaft motor is completed. The application can make the shaft motor directly use three-phase AC power, without the need of AC-DC-AC power change, and simplify the ship power grid. At the same time, the application is the control of the stator voltage synthesis vector, can improve the dynamic response of the permanent magnet synchronous motor, and is more suitable for digital control system.

This invention relates to the field of spacecraft power technology, and in particular to a space power system with controllable power flow and its control method. It includes a spacecraft primary bus, a power electronic converter with controllable power flow, an energy storage unit, a logic control unit, a load, and a power distribution switch. The positive terminal of the spacecraft primary bus is connected to one end of the power distribution switch and one input terminal of the power electronic converter with controllable power flow. One end of the load is connected to the other end of the power distribution switch. The other input terminal of the power electronic converter with controllable power flow is connected to the other end of the load and the negative terminal of the spacecraft primary bus. The input terminal of the energy storage unit is connected to the output terminal of the power electronic converter with controllable power flow. The logic control unit is used to collect the voltage at the positive and negative terminals of the spacecraft primary bus and the current of the load. This invention features high power density, fast dynamic response, simple circuit structure, and avoids severe electromagnetic interference.

The invention relates to the technical field of power electronics, in particular to a multi-element heterogeneous hydrogen production power supply and a control method. The power supply includes a main branch and an auxiliary branch. The main branch comprises a first rectification circuit and a Buck converter. The input end of the first rectifying circuit is connected with a first output winding of the transformer, the output end of the first rectifying circuit is connected with the input end of the Buck converter, the output end of the Buck converter is connected with the first end of the direct-current bus, and the main branch is used for providing steady-state power. The first rectifying circuit is an uncontrolled rectifying circuit. The auxiliary branch comprises a second rectification circuit and a full-bridge circuit. The input end of the second rectifying circuit is connected with a second output winding of the transformer, the output end of the second rectifying circuit is connected with the input end of the full-bridge circuit, the output end of the full-bridge circuit is connected with the first end of the direct-current bus, and the auxiliary branch is used for transmitting fluctuating power or alternating-current excitation. According to the embodiment of the invention, balance between steady-state high efficiency and dynamic quick response can be achieved.

The application discloses a high-precision six-axis motion platform, which comprises a steel frame assembly, a stone material assembly, an XY-axis assembly, an AC-axis rotary table, a Z-axis assembly and a B-axis rotary table, the stone material assembly is installed on the steel frame assembly, the XY-axis assembly is installed on a base of the stone material assembly, the AC-axis rotary table is horizontally installed on a Y-axis load plate of the XY-axis assembly, the Z-axis assembly is vertically installed on a cross beam of the stone material assembly, and the B-axis rotary table is installed on a Z-axis load plate of the Z-axis assembly. The six-degree-of-freedom independent collaborative control is realized through the brand-new modular independent partition structure and the direct drive transmission-free scheme, the transmission gap and coupling error are eliminated from the mechanical root, the platform positioning precision, the dynamic response speed and the structural rigidity are simultaneously improved, the assembly and calibration process is simplified, the production and maintenance costs are reduced, and the high-precision operation of the semiconductor and optical detection fields is adapted to the harsh working conditions.

This invention discloses a collaborative anti-surge system and method for a supercritical carbon dioxide compressor based on working fluid inventory adjustment and inlet state constraints. The system includes: a supercritical carbon dioxide compressor compressing a closed-loop working fluid; a carbon dioxide working fluid inventory adjustment unit actively changing the operating state by adjusting the inventory through inlet gas replenishment or outlet temporary storage; a surge state measurement and feature extraction unit collecting operating parameters, surge signals, and adjustment unit status to extract features; an anti-surge reflux unit recirculating the outlet working fluid back to the inlet when the adjustment capacity is insufficient, the inlet does not meet the constraints, or in case of emergency anti-surge; and a controller connecting each unit, judging the surge risk and cause based on the information, calculating the adjustment capacity and inlet constraints, controlling the inventory adjustment unit to perform gas replenishment, temporary storage, or combined adjustment, or activating the anti-surge reflux unit when conditions are met. This invention achieves anti-surge control of a supercritical carbon dioxide compressor by collaboratively adjusting the carbon dioxide working fluid inventory and the anti-surge reflux.

This utility model discloses an integrated six-dimensional portable force measuring plate, including an elastomer and a protective assembly disposed outside the elastomer. The assembly includes a hub, a force-bearing platform, and multiple strain beams. The force-bearing platform is located in the center of the hub, and the hub and force-bearing platform are connected by multiple strain beams. Multiple strain gauges are attached to different positions on the strain beams. A through hole is formed in the center of the force-bearing platform, and a bridge plate for forming a Wheatstone bridge and a data acquisition board for collecting and converting the output signals of the elastomer are disposed within the through hole. Multiple wires are led out from the strain gauges and soldered to the bridge plate to form six Wheatstone bridges, which are used to detect forces and moments in three directions, denoted as Fx, Fy, Fz, Mx, My, and Mz. Advantages: The integrated force measuring plate eliminates the need for multiple sensor splicing; multiple beams can work together to balance the force and compensate for each other, reducing the influence of off-center loading on the measurement results; multiple force measuring plates can be spliced ​​together for use.

The invention relates to the technical field of hybrid electric vehicle train energy management, and particularly discloses a self-adaptive weight dynamic planning hybrid electric vehicle train energy management method, which comprises the following steps: road network reconstruction: obtaining gradient information of a vehicle by using a terminal and a map of an Internet of Vehicles service system; calculating feasible regions: calculating the maximum acceleration and the minimum acceleration reached by the vehicles on each road section, and iterating to obtain the feasible regions of all the road sections in front; establishing a pre-planning cost function model: determining the vehicle speed as a dynamic planning algorithm state variable, and establishing the pre-planning cost function model; performing one-dimensional dynamic planning on the vehicle speed; optimizing by using a DP (Decentralized Performance) algorithm, namely performing iterative calculation in a speed feasible region by using a state transition equation; updating a self-adaptive weight and cost function; vehicle speed and SOC dynamic planning; vehicle speed planning and SOC execution are carried out, and optimal energy efficiency cruise control is carried out; the method is adaptive to the gradient working condition, multi-target performance is considered, the overall performance is improved through collaborative planning, and the driving smoothness and dynamic response consistency are improved.

The invention relates to the technical field of maglev train control, in particular to a sliding mode active-disturbance-rejection control method of a permanent magnet and electromagnetic hybrid suspension electromagnet. Comprising the following steps: step 1, establishing a hybrid suspension electromagnet model based on a magnetic diversion type hybrid suspension electromagnet system; 2, carrying out suspension force modeling according to the hybrid suspension electromagnet model, and establishing a suspension force equation of the magnetic diversion type hybrid suspension control system by enabling the suspension force to be equal to the gravity of the train; the sliding mode active-disturbance-rejection control method provided by the invention is applied to the magnetic diversion type hybrid suspension system, and the dynamic stability and robustness of the system are remarkably improved. According to the method, the advantages of sliding mode control and active disturbance rejection control (ADRC) are fused, the defects of a traditional control strategy (such as PID) in coping with load change, airflow disturbance and parameter uncertainty are effectively overcome, and high-precision air gap position control and rapid dynamic response are achieved.

The application discloses a kind of method and system for controlling the stable output of inverter, obtain grid voltage, input to the inverter main circuit control model of pre-constructed including improved feedforward decoupling and PI link, output stable voltage;The construction of inverter main circuit control model including improved feedforward decoupling and PI link includes: obtaining the main circuit topology of LC type inverter to be processed, analyzing main circuit topology determines the mathematical model under the two-phase rotating dq coordinate system of main circuit topology;Improved feedforward decoupling is used to the current inner loop decoupling of mathematical model, and the voltage loop considering the dynamic link of current loop is obtained;According to the PI parameter of current inner loop and voltage outer loop set by voltage loop considering the dynamic link of current loop, the inverter main circuit control model of the improved feedforward decoupling and PI link is obtained according to the PI parameter of current inner loop and voltage outer loop.It is advantageous: it can effectively suppress the output voltage fluctuation of inverter under large disturbance, improve the dynamic response speed of system.

The application discloses an airport hub construction intelligent regulation and control method and system based on BIM+5G, relates to the technical field of construction scheduling optimization, and comprises the following steps: collecting real-time data on site to construct a path construction sequence model, constructing a dynamic construction state set consistent in space and time sequence through component coding and semantic attribute mapping, constructing a minimum disturbance optimization algorithm of four-dimensional disturbance cost based on a construction disturbance mapping diagram, outputting process sequence adjustment, resource rearrangement, path decoupling and environmental avoidance intervention suggestions, and tracking the construction response state in real time based on an intervention execution feedback mechanism. The method constructs a ternary structure and a construction disturbance mapping diagram, realizes unified modeling of construction plans, resource allocation and green indicators, dynamically collects on-site states in combination with 5G and edge perception systems, accurately identifies process abnormalities and resource conflicts, generates efficient and executable regulation and control strategies based on a multi-objective disturbance optimization algorithm, and significantly improves the intelligence, responsiveness and energy-saving level of the construction process.

The utility model discloses a three-level topological filtering compensation device, which relates to the technical field of filtering compensation and comprises a controller and a three-level topological filtering compensation circuit. The three-level topology filtering compensation circuit comprises a direct current side equalization circuit, a three-level topology first circuit, a three-level topology second circuit and an alternating current side filtering circuit. The direct current side equalization circuit comprises capacitors C1 and C2 which are connected in series, and the capacitors C1 and C2 are respectively connected with a first bidirectional switch tube and a second bidirectional switch tube in parallel; a series circuit formed by the capacitor C1 and the capacitor C2 is respectively connected in parallel with the three-level topology first circuit and the three-level topology second circuit; the controller is connected with the first bidirectional switch tube and the second bidirectional switch tube. According to the invention, the DC side equalization circuit is designed, and the two capacitors are respectively connected in parallel with the bidirectional switch tubes, so that the system efficiency is improved, and load fluctuation can be adapted.

The invention relates to the technical field of hydraulic systems of engineering machinery, and discloses a compact load-sensitive proportional valve of an integrated hydraulic lock, which comprises an oil inlet body and a reversing body which are fixedly connected through a bolt. A main valve element is installed in the middle of the oil inlet body in a sliding mode, a pressure adjusting plug screw, a flow dividing spring, an unloading valve assembly and other components are arranged, the opening pressure can be adjusted, and overpressure unloading is achieved. A hydraulic lock assembly and a pressure compensation valve element are arranged in the reversing body and are designed in a coaxial nesting mode, and a valve element of the hydraulic lock assembly is of a double-conical-face structure. A control oil way is communicated with a main valve element displacement cavity to achieve linkage unlocking, and a load pressure feedback channel is isolated from a control channel through an independent spiral oil channel. A micro filter is arranged at an inlet of the hydraulic lock control oil duct and used for preventing pollution. The invention has the advantages of compact structure, strong anti-pollution capability and fast dynamic response, can realize the accurate matching of a pump valve system and load pressure flow, and is suitable for the control of actuating mechanisms of engineering machinery such as tractors, cranes and the like.

The high-frequency pilot proportional valve comprises a controller, a proportional electromagnet and a valve assembly, the valve assembly comprises a valve body, a main valve element arranged in an inner cavity of the valve body and sealing covers used for sealing the two ends of the inner cavity, a pilot valve element is arranged in an inner hole of the main valve element in a sliding mode, and the two ends of the pilot valve element are connected with the sealing covers in a sliding and sealing mode. Control oil cavities located at the two ends of the main valve element are formed between the main valve element and the sealing covers. The pilot valve element is driven by the proportional electromagnet to axially move along an inner hole of the main valve element, a throttling opening of the main valve element is opened to adjust the pressure difference of the control oil cavities at the two ends, the pilot valve element is driven by the pressure difference to reciprocate along an inner cavity of the valve body, and the oil way communication state of the proportional valve is switched. The driving force of the proportional electromagnet and the displacement of the pilot valve element are not interfered by oil pressure, the movement of the main valve element of the proportional valve is driven by the pressure difference of the control oil cavities at the two ends, and the dynamic response speed, the working pressure and the control precision of the proportional valve are effectively improved.