671 results about "Proportional control" patented technology

The invention discloses an ablation impedance dynamic prediction method based on multi-modal time sequence fusion and a related device. The method comprises the following steps: acquiring multi-modal time sequence data of an ablation electrode in real time, and constructing a multi-dimensional input vector containing a temperature change rate, an ultrasonic echo gradient and a standardized timestamp; performing parameter fine tuning by using a pre-trained two-channel long-short-term memory neural network, respectively extracting feature vectors of the physical parameters and the image parameters, fusing the feature vectors, and outputting an impedance predicted value in a future preset time window; and dynamically adjusting the ablation output power by adopting a proportional control strategy based on the deviation between the predicted impedance and the target impedance. Through time sequence fusion of the multi-modal data and the prediction capability of the deep learning model, the real-time monitoring and power adjustment precision of the ablation process is improved, and the safety and effect stability of ablation treatment are effectively improved.

The invention relates to a hydraulic system of a steering mechanism, the steering mechanism and engineering machinery, the hydraulic system of the steering mechanism is used for controlling forward running steering and reverse running steering of a vehicle, and the hydraulic system of the steering mechanism comprises a hydraulic pump (1); the unloading valve group (2) is arranged on an oil supply path of the hydraulic pump (1), and the unloading valve group (2) is configured to release the pressure of the hydraulic oil; the proportional control valve group (3) is arranged on a working oil way of the unloading valve group (2), and the proportional control valve group (3) is configured to control the steering direction and the steering angle of the first steering axle (10) and the steering angle of the second steering axle (20); the flow amplification valve group (4) is arranged between the proportional control valve group (3) and the steering oil cylinder (5), the flow amplification valve group (4) and the steering oil cylinder (5) are both located on a working oil way of the proportional control valve group (3), and the flow amplification valve group (4) is configured to amplify the flow of hydraulic oil entering the steering oil cylinder (5).

The invention relates to a motion compensation type pile gripper perpendicularity adjustment control method which comprises the following steps: 1, mounting a tilt angle sensor and a displacement sensor on a pile gripper for detecting the tilt angle theta of a pile body and the position of a supporting arm in real time; step 2, acquiring a current inclination angle value theta c and a target value theta t through a control system, calculating a real-time perpendicularity deviation delta theta = theta c-theta t, and driving a servo mechanism to adjust the position of a supporting arm according to the perpendicularity deviation delta theta so as to perform motion compensation; and step 3, dynamically correcting the compensation process by using a closed-loop control algorithm until the condition that verticality adjustment is completed is met, namely delta theta is less than or equal to epsilon, and epsilon is an allowable error threshold. A high-precision inclination angle sensor and a displacement sensor are installed on the pile gripper, the inclination angle of a pile body and the position deviation of a supporting arm are detected in real time, and a control signal is dynamically generated through a closed-loop control algorithm to drive a servo mechanism to conduct adjustment. A dynamic parameter compensation mechanism is designed, control parameters are corrected in real time according to the inclination angle of the foundation and external force interference, the adjusting precision and stability under the conditions of complex terrains and dynamic external force are remarkably improved, a servo mechanism achieves precise action through a hydraulic driving system and a proportional control valve, the response time of the servo mechanism meets the engineering requirement, and the engineering cost is reduced. And the perpendicularity error of the pile body can be controlled within a preset range, the construction efficiency and the long-term stability are improved, and the problem that a traditional manual adjustment and mechanical auxiliary system is insufficient in precision is solved.

The invention provides a method for calculating parameters of a three-component proportional controller, which comprises the following steps of: S1, calculating and determining the height of a shell of each set of the proportional controller and the unit displacement of a volume metering component of the proportional controller according to the component proportion and the height of the proportional controller; s2, according to the geometric structure relation and boundary dimension constraint of the volume metering component of the proportional controller, calculating and determining the diameter of a leakage-resistant rotor blade, the diameter of a leakage-resistant rotor transmission shaft, the diameter of a displacement rotor blade and the diameter of a displacement rotor transmission shaft; s3, calculating the internal leakage rate and the proportional error of the volume metering part of the proportional controller, evaluating whether the proportional controller meets the design requirement or not according to the proportional error, and if the design requirement is not met, executing the steps S1 to S2 again; and S4, according to the rotating speed relationship between the displacement rotor and the leakage-proof rotor, calculating and determining the modulus and the tooth number of a linkage gear of the leakage-proof rotor and the displacement rotor. According to the method, designers can be assisted to quickly obtain reasonable key structure parameters of the three-component proportional controller.

The invention provides a stable operation control method and system for a self-synchronizing voltage source centralized photovoltaic inverter, and the method comprises the steps: detecting the change rate of the DC voltage of the centralized photovoltaic inverter and the output active power of a photovoltaic panel in real time, and when the ratio of the change rate of the DC voltage to the change rate of the output active power of the photovoltaic panel exceeds a threshold value, starting the control of the stable operation of the photovoltaic inverter. A system working mode is converted from a power control mode to a voltage control mode, and a power given value and a direct-current voltage given value of a control system are adjusted in real time. A synchronous angular frequency is obtained by adding an output value of the deviation of the active power through a proportional controller and a power grid frequency value, and the phase of an output modulation voltage of a grid-connected converter is obtained after integration, so that the grid-connected power of the photovoltaic inverter is adjusted. The working points of the photovoltaic inverter can stably operate on all the working points of the photovoltaic power-voltage characteristic curve, it is ensured that the photovoltaic inverter is located at the maximum power point all the time, and then stable operation control over the self-synchronizing voltage source centralized photovoltaic inverter is achieved.

The invention discloses a method and system for detecting and adjusting the posture of a tractor tool, and belongs to the technical field of agricultural equipment. Comprising the following steps: acquiring acceleration data and angular velocity data generated during operation of a tractor tool; processing the acceleration data and the angular velocity data through an attitude fusion algorithm to obtain machine and tool attitude information; generating a control signal based on a comparison result of the machine posture information and a preset horizontal standard value, and sending the control signal to an execution mechanism, so that the execution mechanism adjusts the machine posture; the executing mechanism comprises a multi-way proportional electromagnetic valve, a hydraulic oil cylinder and a suspension device, the hydraulic oil cylinder is arranged on the suspension device, and the multi-way proportional electromagnetic valve is communicated with the hydraulic oil cylinder. Electro-hydraulic proportional control and sensor control are combined, agricultural implements hung on a tractor running on a fluctuating land parcel are controlled to be kept horizontal, and stable operation after control is achieved. The problem that actual operation conditions of agricultural machinery are not considered in the prior art is solved.

The invention relates to the technical field of hydraulic valves, and discloses a high-water-base large-flow digital proportional valve which comprises a valve seat unit. By adjusting the pressure of the control cavity K1 and the pressure of the control cavity K2, a certain pressure difference is formed between high-water-base hydraulic media in the control cavity K1 and the control cavity K2, so that the high-water-base hydraulic media can push a low-pressure side pushing check ring or a high-pressure side pushing check ring to move, the low-pressure side pushing check ring or the high-pressure side pushing check ring can drive a push rod to move, and the low-pressure side pushing check ring or the high-pressure side pushing check ring can push the high-pressure side pushing check ring to move. Therefore, the high-pressure side cone valve element or the low-pressure side cone valve element can be driven to move synchronously, when the high-pressure side cone valve element moves, the high-pressure side cone valve element can be matched with a reset spring to press the low-pressure side cone valve element, and when the low-pressure side cone valve element moves, the low-pressure side cone valve element can be matched with the reset spring to press the high-pressure side cone valve element. Due to the fact that the push rod is in separated drive with the high-pressure side cone valve element and the low-pressure side cone valve element, the three-position three-way O-shaped full-proportion control valve with the meso-position function is achieved, accuracy of flow control is guaranteed, and hydraulic impact is avoided.

The invention discloses a digital hydraulic system and a control method. The system comprises a digital hydraulic valve, at least one hydraulic pump assembly and a controller. The digital hydraulic valve comprises at least one working unit, and each working unit comprises a main valve, a front differential pressure compensator and a pilot driving module used for driving and controlling the position of a valve element of the main valve. The differential pressure compensator adopts electric proportional control; the pilot driving module comprises a valve element displacement sensor used for detecting the actual displacement of a valve element of the main valve. The hydraulic pump assembly comprises a hydraulic pump, a variable displacement mechanism, a lead screw and a servo motor, the servo motor converts rotary motion into linear motion through the lead screw to directly control the variable displacement mechanism, and displacement control over the hydraulic pump assembly is achieved. An outlet of the hydraulic pump is connected to an inlet of the differential pressure compensator, an outlet of the differential pressure compensator is connected to an inlet of the working linkage main valve, and a working opening of the working linkage main valve is connected with the oil cylinder or the motor. And the servo motor, the differential pressure compensator and the pilot driving module are respectively in signal connection with the controller.

The invention provides a gas turbine IGV control optimization method combining a PID controller and a single neuron. The method comprises the steps of obtaining a first system error of the PID controller in a kth control period, a second system error of the PID controller in a (k-1) th control period and a third system error of the PID controller in a (k-2) th control period; generating a proportional control input item, an integral control input item and a differential control input item of the PID controller according to the first system error, the second system error and the third system error; the single neuron determines a first control increment of the PID controller in the kth control period based on a first weight coefficient, a proportional control input item, an integral control input item and a differential control input item, and the first weight coefficient comprises a first proportional coefficient, a first integral coefficient and a first differential coefficient in the kth control period; and adjusting the first weight coefficient according to the first system error and the first control increment to obtain a new weight coefficient. Therefore, online adaptive adjustment of the PID parameters can be realized.

The invention discloses an energy storage system coordination control method and system based on dual-objective optimization, and relates to the technical field of frequency modulation. Comprising the following steps: accessing energy storage equipment into a unit control system and acquiring first operation data; based on the first operation data, constructing an energy storage-unit loss cost model and calculating to obtain a first operation reference value; according to the first operation reference value, establishing a frequency fluctuation and energy storage balance dual-objective optimization model; calculating an energy storage-unit output distribution proportion based on the optimization model; and controlling combined frequency modulation of the energy storage system and the unit according to the output distribution proportion. According to the method, the energy storage-unit combined loss cost model is established, so that the operation states of the energy storage system and the thermal power unit are accurately evaluated, and the charge state of the energy storage system is reasonably maintained by establishing the frequency fluctuation and energy storage balance dual-target optimization model; and dynamic optimization operation of the energy storage system and the thermal power generating unit is realized through a coordination control mechanism based on the optimal output distribution proportion.

The present invention relates to the field of electric vehicles and to a highly adaptable creep control method for pure electric heavy-duty trucks. After the pure electric heavy-duty truck enters creep mode, the method performs P-term dynamic proportional control to obtain P-term dynamic proportional control torque; performs I-term dynamic integral proportional closed-loop control to obtain I-term dynamic proportional integral closed-loop regulation control torque; performs slope feedforward torque compensation control to obtain slope compensation torque; and performs vehicle weight feedforward torque compensation control to obtain vehicle weight compensation torque. The P-term dynamic proportional control torque, I-term dynamic proportional integral closed-loop regulation control torque, slope compensation torque, and vehicle weight compensation torque are added together to obtain creep closed-loop regulation control torque. The creep closed-loop regulation control torque is then subjected to a fixed limit to prevent abnormal torque output caused by closed-loop regulation. Through the method of the present invention, stable creep speed control can be achieved for pure electric heavy-duty trucks operating with or without a trailer, unloaded, fully loaded, and under various slope conditions.

The invention relates to the technical field of power electronics, and discloses a low-voltage ride-through control method and device for a network-forming inverter, and the method comprises the steps: monitoring the voltage drop degree of a network side; and adjusting a proportional control coefficient and an integral control coefficient of a proportional-integral controller in the grid-forming inverter according to the grid-side voltage drop degree. By adaptively adjusting the reactive power-voltage loop PI parameter, the stability of the inverter is ensured, and the reactive current response speed of the network-forming inverter during low voltage ride through is greatly improved at the same time.

The invention discloses a multi-mode positioning intelligent corn harvester operation auxiliary system, and relates to the technical field of agricultural machinery. The corn harvester operation auxiliary system comprises a multi-mode positioning fusion module, a multi-source data sensing and preprocessing module, an intelligent decision and control center module, a dynamic operation execution module, an edge calculation and data interaction module and an intelligent remote monitoring and fault diagnosis module. The dynamic operation execution module comprises an operation parameter adjusting unit and a driving control unit, the operation parameter adjusting unit adopts an electro-hydraulic proportional control technology, and the driving control unit is combined with a steer-by-wire and driving technology to form closed-loop control; the system and the method have the advantages that the limitation of traditional single satellite positioning is solved by using a four-mode fusion framework of satellite positioning, inertial navigation, visual positioning and UWB positioning, and inertial navigation, visual positioning and UWB positioning work cooperatively in mountainous areas and other environments in which satellite signals are easy to block.

The invention discloses a paver starting vibration system and a control method, and relates to the technical field of road construction machinery, the control method comprises the following steps: starting a starting stage automatic adjustment mode, setting initial operation parameters, and collecting an actual rotation speed in real time; based on the actual rotating speed, establishing a linear proportional control relation for the running speed, and dynamically adjusting the running speed; and the dynamic adjustment process is continuously carried out, and when specific conditions are met, the mode is automatically switched to the normal mode. The intelligent control that the paving speed is restrained by the vibrating rotating speed is achieved, and the technical problems that in the asphalt paving starting stage, due to the fact that the resistance of the vibrating beam is increased, the actual rotating speed is insufficient, and due to the fact that the vibrating rotating speed is not matched with the paving speed, the pavement compactness is poor, and the flatness is low are solved.

The invention discloses efficient heat dissipation cooling equipment adaptive to a new energy automobile power battery. The efficient heat dissipation cooling equipment comprises a battery frame; the liquid cooling plate is fixedly mounted at the bottom of the battery frame; the second cooling system comprises a refrigerant supply pipe, a refrigerant recovery pipe and a side cooling plate, and the refrigerant supply pipe is fixedly mounted on the side wall of the battery frame; a main pipe inlet of the three-way proportional regulating valve A is connected with the cooling liquid supply main pipe, a branch pipe outlet of the three-way proportional regulating valve A is connected with the first connector pipe, and another branch pipe outlet of the three-way proportional regulating valve A is connected with the second refrigerant inlet; a main pipe inlet of the three-way proportional regulating valve B is connected with the cooling liquid return main pipe, a branch pipe outlet of the three-way proportional regulating valve A is connected with the second connector pipe, and another branch pipe outlet of the three-way proportional regulating valve A is connected with the second refrigerant outlet. Compared with the prior art, the invention solves the problem of low heat dissipation and cooling efficiency of the existing new energy automobile power battery which only controls the temperature through the lower side liquid cooling plate.

The invention discloses an annular permanent magnet linear synchronous motor speed feedforward compound control method considering disturbance compensation, and the method comprises the steps: taking an annular permanent magnet linear synchronous motor TPMLSM as a control object, and building a voltage model of the TPMLSM under a three-phase static coordinate system; based on this, establishing a control model under a d-q rotating coordinate system; determining a speed loop transfer function of the TPMLSM based on conventional integral proportion (PI) control, introducing a feed-forward controller on the basis, and designing a TPMLSM speed feed-forward composite controller through the transfer function of the feed-forward controller; a quasi-resonance extended state observer (ESO) is used for observing external disturbance, a disturbance observation value is equivalent to a q-axis current disturbance quantity, and feedforward compensation is carried out on the q-axis current disturbance quantity to a speed ring for output, so that the anti-disturbance capability of the speed ring is improved; proportional control is introduced into disturbance observation items of the ESO disturbance observer, dynamic response of the disturbance observer under low bandwidth is accelerated, the dynamic response of a motor control system is improved, and the anti-disturbance capability of the system is enhanced.

The invention provides a thermal power generating unit operation control method and device, electronic equipment and a readable storage medium, and belongs to the technical field of thermal power generation control. The method comprises the steps of obtaining a current operation load rate of a thermal power generating unit; based on the current operation load rate, according to a preset relation table or a preset relation curve, the high-alkali coal blending proportion is determined, and the preset relation table or the preset relation curve is used for representing the corresponding relation between different operation load rates and the high-alkali coal blending proportion; and on the basis of the high-alkali coal blending proportion, an in-furnace raw coal switching system of the thermal power generating unit is controlled to adjust the input amount of high-alkali coal powder and low-alkali coal powder input into the boiler. According to the operation load rate of the thermal power generating unit, the blending proportion of the high-alkali coal in the pulverized coal needed for boiler combustion is determined, normal work of the boiler can be guaranteed, the slag bonding amount can be reduced, the use amount of the high-alkali coal can be increased, and the power generation cost is effectively reduced.

The invention relates to the technical field of proportional valves, and discloses a stepless speed regulation proportional valve with displacement detection, which comprises a valve body, a proportional controller is arranged at the bottom of one side of the valve body, a proportional cavity is arranged in the valve body, the size of the bottom of the proportional cavity is larger than that of the top, a conical surface is arranged at the joint, and an inlet cavity is arranged at the top of one side of the valve body. An outlet cavity is formed in the bottom end of the valve body, a valve rod is arranged in the valve body, a valve element is fixedly arranged at the bottom of the valve rod, a permanent magnet is arranged at the top of the valve rod, a shell is arranged at the top end of the valve body, and a displacement detector is arranged in the shell. When the valve rod drives the valve element to move, the displacement detector can move synchronously under the action of the supporting spring, the position, the movement speed and the movement direction of the valve element are detected, and the accuracy of the proportional valve is guaranteed; and the positions of the connecting pipe and the pipeline can be preliminarily positioned through the arranged positioning clamp.

The invention relates to the technical field of roll grinders, and discloses a grinding control method and system for a roll grinder, and the method comprises the steps: deploying a pressure sensor, collecting pressure data and position coordinates, and building an initial data set. Abnormal data are identified and removed by detecting a time-pressure curve, missing values are complemented by utilizing curve fitting, and a corrected data set is formed. Workpiece boundaries are recognized based on pressure distribution, and after effective data are screened, a weighted average pressure value is calculated in the vertical direction of the grinding wheel. And dynamically adjusting the normal force of the grinding wheel by adopting a proportional control algorithm to enable the pressure to approach a target value. Abnormal data can be monitored, equipment health state evaluation is supported, the workpiece surface burning risk is reduced through pressure feedback compensation, and the size precision is improved.

The invention relates to the technical field of agricultural machinery intelligent control, in particular to a combine harvester track trafficability control method based on visual inspection, which comprises the following steps: S1, predicting a motion track based on the real-time traveling speed and steering angle of a harvester; s2, extracting a real-time terrain slope angle of the trajectory region; s3, determining a target grounding pressure distribution mode required by the track in the predicted track area; s4, calculating a target hydraulic flow distribution proportion used for controlling a walking motor; and S5, the hydraulic valve group is controlled to adjust the oil supply amount according to the target flow distribution proportion. Through linkage of visual perception and hydraulic control, segmented self-adaptive adjustment of the track grounding pressure is achieved, and the trafficability and operation stability of the combine harvester under complex terrains are effectively improved.

The invention provides an active power integrated closed-loop control method for a photovoltaic power station. The active power integrated closed-loop control method comprises the following steps: obtaining a first instruction value according to a scheduling instruction; calculating first power according to inverter information; obtaining a calculation deviation according to the first instruction value and the first power; comparing the absolute value of the calculated deviation with a deviation dead zone limit value; when the absolute value of the calculation deviation is greater than the deviation dead zone limit value, obtaining the current deviation according to the calculation deviation; comparing the absolute value of the current deviation with the switching boundary value; if the absolute value of the current deviation is larger than the switching boundary value, a second instruction value is calculated through pure proportional control; if the second comparison result is that the absolute value of the current deviation is not greater than the switching boundary value, calculating a second instruction value by adopting proportional-integral control; and allocating a scheduling instruction according to the second instruction value and the inverter information. According to the invention, a control mode of switching between pure proportional control and proportional-integral control is adopted, so that an instruction can be accurately tracked, and the adjusting process is stable.

The invention belongs to the technical field of tunnel construction, and particularly relates to a tunnel concrete guniting accelerator control method and system and computer equipment. The method comprises the following steps: firstly, acquiring a real-time position of a spray head for guniting in a tunnel, and determining an accelerator foundation proportion corresponding to the real-time position according to a preset corresponding relationship between different positions of the tunnel considering different gravity components and the accelerator foundation proportion; meanwhile, real-time environment factors influencing the concrete setting time in the tunnel are obtained, and the accelerator adjusting proportion corresponding to the real-time environment factors is determined according to the corresponding relation between the preset different environment factors and the accelerator adjusting proportion; finally, the determined basic proportion of the accelerator is adjusted according to the determined adjusting proportion of the accelerator, and an accelerator adding device is controlled according to the adjusted proportion. The influence of gravity components of different positions of the tunnel and environmental factors influencing the concrete setting time in the tunnel on the proportion of the accelerator is fully considered, so that the added accelerator is more scientific and reasonable.

The embodiment of the present application discloses a power supply system and its control method. The power supply system includes N distributed power sources and at least one detection control unit. The N distributed power sources are connected to the power grid in parallel or in series, and N is an integer greater than 1; the detection control unit is used to obtain the power compensation control ratio of each distributed power source based on the impedance of each distributed power source to the grid connection point of the power supply system when it detects that the oscillation of the power supply system exceeds a preset threshold range. The power compensation control ratio is the ratio of the power output of each distributed power source to the total power output of the power supply system; the detection control unit is also used to control the power output ratio of each distributed power source based on the power compensation control ratio. By adopting the embodiment of the present application, it is possible to suppress the oscillation of the power supply system and ensure the normal and stable operation of the power supply system without changing the original control circuit or adding additional equipment, so the implementation is low in complexity and low in cost.

The invention relates to the technical field of hydraulic control, and provides a load-sensitive type water-based proportional directional valve which comprises a valve body, a first valve element, a second valve element, a first valve element and a second valve element. The main valve element is movably arranged in the valve body, a main valve element hole and a second connector connected with a controlled load are formed in the main valve element, the main valve element hole is connected with the liquid inlet and the second connector, and the second connector is further connected with the liquid return opening; the valve seat is movably arranged in the valve body and is in contact connection with the main valve element, the end, away from the valve body, of the valve seat is connected with the valve body to form a control cavity, and the control cavity communicates with the first connector; when the pilot valve working port selectively communicates with a liquid inlet pipeline or a liquid return pipeline, a working medium in the control cavity can act on the main valve element and the valve seat, so that the second connector selectively communicates with the liquid inlet or the liquid return port, and therefore work of the controlled load is controlled. According to the invention, load-sensitive proportion control can be realized, and the service life of the controlled load is prolonged.

The invention provides a neutral-point potential control method and system for a three-level converter, and relates to the technical field of intelligent control, positive bus voltage and negative bus voltage are sampled, a voltage deviation value is calculated, an additional control quantity is generated according to the voltage deviation value and a symbol of alternating current, and the additional control quantity is obtained through a symbol function and proportional control processing; performing amplitude limiting processing on the additional control quantity to obtain an amplitude-limited additional control quantity; superposing the amplitude-limited additional control quantity on the positive modulation wave, negating the amplitude-limited additional control quantity, and superposing the negated amplitude-limited additional control quantity on the negative modulation wave to obtain a final positive modulation wave and a final negative modulation wave; comparing the final positive modulation wave and the final negative modulation wave with a carrier wave, and generating a driving signal of the power device; and the on-off of the switching device is controlled according to the driving signal, so that a corresponding level is output to realize neutral-point potential balance. According to the invention, neutral-point voltage low-frequency fluctuation and direct-current offset suppression can be realized at the same time.

The invention discloses a vacuum induction melting furnace for alloy melting, and relates to the technical field of melting furnaces. The vacuum induction smelting furnace for alloy smelting comprises a smelting furnace body, a heating unit, a crucible, a bottom support, a mold base, a vacuum control unit, a feeding unit, a discharging control unit and a proportional control mechanism. According to the smelting furnace, the feeding unit is additionally arranged on the smelting furnace main body, the feeding unit is convenient for storing various raw materials and controlling discharging, the tedious operation of opening the furnace for adding the raw materials for many times is avoided, time and labor are saved, alloy smelting can be continuously and stably carried out, the discharging amount of the two raw materials is controlled through the design of the discharging control unit and the proportion control mechanism, and the smelting efficiency is improved. Quantitative supply is achieved, the discharging proportion of the two raw materials is accurately controlled through the proportion control mechanism, operation is easy and convenient, errors are not prone to occurring, the requirement for accurate proportion of different alloy components can be met, and stability and consistency of alloy quality are guaranteed.

The invention relates to the field of gas mixing systems, and discloses a gas mixing system based on high-pressure proportional valve control. The system comprises at least two gas branches, and each gas branch is provided with a high-pressure proportional valve communicated with a gas inlet and a one-way valve located at the downstream of the high-pressure proportional valve. The mixing unit is used for mixing the gas of each gas branch in a high-pressure state; the energy storage unit is communicated with the mixing unit and is used for temporarily storing the mixed high-pressure gas; the detection control unit comprises a gas analyzer communicated with the energy storage unit and a controller electrically connected with the gas analyzer, and the controller adjusts the opening degree of the high-pressure proportional valve in a closed-loop mode according to detection signals of the gas analyzer, so that the target component concentration of the mixed high-pressure gas is maintained within a preset range. The system can directly realize accurate proportioning and dynamic adjustment of multi-component gas on a high-pressure side, reduces lag and energy consumption of a low-pressure mixing scheme, and is suitable for high-pressure laser welding, material testing and other scenes needing quick response and high-precision proportion control.

The invention discloses a flow monitoring and valve control system for preventing excessive filling, and relates to the technical field of control, and the flow monitoring and valve control system comprises the following steps: carrying out weighted average on instantaneous flow data through a weighted average fusion algorithm to obtain corrected instantaneous flow data; the initial filling flow is calculated by accumulating the corrected instantaneous flow data, and the corrected filling flow is calculated according to the comprehensive correction coefficient and the initial filling flow; the flow change rate is obtained through the instantaneous flow; a flow dynamic threshold value is obtained through a sliding window technology; when the flow change rate is smaller than the flow dynamic threshold value, the current valve opening degree is calculated, and the smooth valve opening degree is calculated through an exponential weighted moving average algorithm; the difference value between the filling flow and the standard filling flow is corrected, control is achieved by adjusting the voltage through a proportional control algorithm, when the difference value is reduced to zero, the valve is closed, excessive filling is avoided, and a solid technical guarantee is provided for filling of the liquid natural gas.

The independent control hydraulic system of the ultra-large mining excavator comprises a plurality of pump sets, each pump set is connected with a main valve, a plurality of working units are arranged in each main valve, and each main valve is provided with a working unit connected with a movable arm oil cylinder, a bucket rod oil cylinder and a bucket oil cylinder. The working unit is connected with the left walking motor, the opening and closing bucket oil cylinder, the rotary motor and the right walking motor, and two control ends of the working unit are proportional control ends. According to the independent control hydraulic system of the ultra-large mining excavator and the using method, one pump set controls one set of main valves, independent control over a plurality of working sets of the same executing mechanism is achieved, the oil inlet and return through-flow area requirements can be met at the same time, the speed is guaranteed, meanwhile, back pressure is convenient to adjust, and action smoothness is improved; meanwhile, through independent control of different pump sets and different working sets of the same valve set, independent oil supply of an executing mechanism can be achieved, load difference losses between composite actions are reduced, energy consumption is reduced, and operation efficiency is improved.

The invention discloses a control method of a gas circuit device, a gas circuit control system and a computer readable storage medium, and relates to the field of gas circuit control. The method comprises the steps that the gas flow of the gas circuit device at the current moment is obtained; determining a gas flow difference value according to the gas flow at the current moment and a preset gas flow value; gas pump control parameters are determined according to the gas flow difference value and gain coefficients, the gain coefficients comprise a proportional gain coefficient, an integral gain coefficient and a differential gain coefficient, and the gas pump control parameters comprise a proportional control parameter, an integral control parameter and a differential control parameter; and the output power of the air pump is adjusted according to the air pump control parameters. The gas circuit device aims at solving the problem that an existing gas circuit device is prone to flow disturbance, and consequently the stability of the gas circuit device is poor.