1432 results about "Proportional valve" patented technology

The embodiment of the invention relates to the technical field of sealing detection, and discloses an artificial intelligence-based sealing detection method, which comprises the following steps of: determining corresponding control parameter information according to the volume of a detected object and a deformation parameter of the detected object of detected object information; according to the control parameter information, the working states of the air source assembly and the inflation proportional valve are controlled to inflate the tested object; if the pressure conversion information is smaller than a first set threshold value, it is determined that the airtightness of the corresponding measured object meets the requirement, and if the pressure conversion information is larger than the first set threshold value, the next step is executed; and obtaining an infrared detection image of the detected object shot by the infrared camera, inputting the infrared detection image into the air tightness detection model for identification so as to determine the air tightness state of the corresponding detected object, and outputting the corresponding air tightness state. According to the scheme of the embodiment of the invention, through accurate inflation control and an intelligent detection process, the method can improve the detection efficiency while ensuring the detection precision.

The invention relates to the technical field of flow measurement and control, and particularly discloses a cheese filling flow real-time calibration control method and system.The cheese filling flow real-time calibration control method comprises the following steps that working condition information of cheese in a filling pipeline is collected in real time, and the working condition information comprises the temperature, the pressure, an original flow signal, the pump rotating speed and the proportional valve opening degree; dynamically selecting a filtering order according to the signal-to-noise ratio of the original flow signal, and outputting the filtered flow; and based on the acquired working condition information, predicting the dynamic viscosity of the cheese in real time through a neural network, fitting a flow-working condition relation function and calculating a target flow value. The signal-to-noise ratio of an original flow signal is dynamically adapted to optimize filtering processing, signal distortion caused by interference such as temperature drift and mechanical vibration is effectively eliminated, and the flow detection precision is improved; by means of the neural network, the dynamic viscosity of cheese is predicted in real time, the model is dynamically adjusted, the problems that traditional viscosity estimation lags behind, and the batch adaptability is poor are solved, and an accurate basis is provided for flow target value calculation.

The invention belongs to the technical field of clamping, and provides a self-adaptive shape follow-up centering clamp and an automatic clamping method. The self-adaptive shape follow-up centering clamp comprises an end cover, an outer circular ring, a floating shape follow-up positioning cylinder, a driving clamping cylinder, an inner circular ring, a hanging ring, a rib plate and a PLC control system. The automatic clamping method can replace a traditional process ring clamping method, self-adaptive shape follow-up positioning and clamping of the barrel workpiece are achieved, the process ring turning procedure is omitted, and material consumption is reduced. After the outer circular ring, the cylindrical roller bearing and the axis of the lathe spindle in the self-adaptive shape follow-up centering clamp are mounted consistently, it can be guaranteed that the middle barrel section coincides with the axis of the lathe spindle. Shape-following positioning of a blank barrel workpiece is achieved through the floating shape-following positioning cylinder, the barrel workpiece is clamped through the driving clamping cylinder, and it is guaranteed that stress is uniform while the axis of the barrel workpiece does not deviate. The device is achieved based on a PLC control system, the clamping force is quantitatively controlled through feedback adjustment of the oil pressure gauge and the proportional valve, and clamping deformation is reduced.

The invention relates to the technical field of automatic control, in particular to a multi-parameter cooperative control method and device for a clamping system of a precision boring and milling machine. According to the method, an industrial camera is used for collecting and processing a workpiece image and extracting visual features, and the visual features are fused with process parameters of a workpiece and geometric distribution parameters of a workpiece key area obtained from a process database; generating a comprehensive state vector; based on the vector, outputting a target clamping force adjustment coefficient by a pre-trained MLP decision model, and calculating a final target clamping force in combination with a safe clamping force range; in the main clamping stage, vibration, temperature and pressure signals are synchronously collected, multi-modal disturbance characteristics are extracted, observation vectors are constructed, the observation vectors are input into a preset fuzzy rule base for reasoning, and compensation activation factors are obtained; and finally, a current correction instruction is dynamically generated according to the clamping force deviation and the compensation factor, and an electro-hydraulic proportional valve is driven to achieve accurate compensation. According to the invention, the stability and the machining reliability of the clamping system are obviously improved.

The invention discloses a micro proportional valve gradient composite coating and a preparation method thereof, and belongs to the technical field of micro proportional valve surface strengthening manufacturing. Aiming at the corrosion-resistant and wear-resistant requirements of the micro proportional valve under the working conditions of strong corrosion, multiple impurities and high pressure difference, the interface strengthening and corrosion-resistant and wear-resistant performance optimization of a metal matrix and a functional coating are combined, and metal / ceramic / polymer gradient material design, spraying parameter suitability research and a coating porosity / bonding strength control method are covered; the valve core and valve seat protection device is suitable for high-efficiency protection technical systems of valve cores and valve seats of precise instruments such as gas chromatographs and mass spectrometers.

The invention provides a small-capacity air bag blood pressure detection system and a precise pressure control method thereof. A micro air pump is communicated with an air inlet of a small-capacity air bag through a pipeline, and a linear proportional valve is arranged on an air release opening of the small-capacity air bag and used for controlling the opening, closing and flow of the air release opening of the small-capacity air bag; the miniature air pump is normally opened and provides stable-flow input air flow for the small-capacity air bag, the valve opening degree of the linear proportional valve is changed by executing a self-adaptive differential constant-pressure control algorithm, then the air release speed of an air release opening of the small-capacity air bag is changed, and pressure adjustment of the small-capacity air bag is achieved by changing the difference between the inflation speed and the deflation speed. According to the invention, rapid pressure stabilization can be realized, and pressure overshoot is hardly generated after the pressure is stabilized; the pressure control precision of 1mmHg at any pressure regulation step length is realized; the problem that the traditional single-parameter closed-loop control cannot meet the precise control of each pressure interval is solved; the production cost is further reduced, and the out-of-hospital scene adaptability and the popularization degree of the equipment are improved.

A hydraulic circuit is disclosed which includes one or more i) linear; or ii) rotary hydraulic actuator, wherein total number of cylinder chambers is N, M pressure rails, a valve arrangement, including M hydraulic rail ports each coupled to a pressure rail, N hydraulic chamber ports each coupled to a chamber of one or more actuators, N proportional valves each corresponding to one of the N hydraulic chamber ports, X sets of on-off valves and check valves coupling two or more hydraulic rail ports to each of supply sides of each of the N proportional valves, and Y sets of on-off valves and check valves coupling two or more hydraulic rail ports to each of return sides of each of the N proportional valves, and a controller configured to in real-time operate the N proportional valves and the associated on-off valves to achieve one or more desired functional parameters.

The invention discloses a control method and device of a hydraulic synchronous lifting device, a computer program and a storage medium, belongs to the technical field of ship manufacturing, and particularly relates to a control method of a hydraulic synchronous lifting device for ship assembly. In order to solve the problems of low synchronization precision, slow dynamic response, insufficient error compensation, poor environmental adaptability and the like of the existing control method of the hydraulic synchronous lifting device, the invention provides the control method of the hydraulic synchronous lifting device, which comprises the following steps of: acquiring a target height, a maximum inclination angle, a maximum deviation and a preset proportional valve opening; the actual heights of the four main jacking oil cylinders are obtained in real time, the average value and the inclination angle are calculated, whether the target height is reached or the maximum inclination angle is exceeded is judged, if not, the deviation of each oil cylinder is calculated, and the opening degree of the corresponding proportional valve is adjusted when the deviation is exceeded, and synchronous lifting is ensured. The device is suitable for the fields of ship building and maintenance, in-place and leveling of bridge precast beam bodies and extremely high requirements for lifting precision and safety.

The invention relates to the technical field of response time testing of electro-hydraulic proportional valves, and discloses a response time testing method and system of an electro-hydraulic proportional valve, and the method comprises the steps: collecting multi-point pressure, step response, pipeline length and medium parameters, and unifying the time reference to obtain an original pressure sequence; constructing an inverse filter spectrum to remove damping interference so as to recover a sharp peak value; lagging offset is calculated according to pipeline and medium parameters, time delay compensation is carried out, and an alignment sequence is obtained; intercepting a non-stationary segment to eliminate residual delay deviation; constructing a response dynamic data set, extracting harmonic frequency domain representation, and reconstructing a pressure sequence through inverse transformation and superposition of compensation factors; and calculating a deviation integral quantity, adjusting a dynamic compensation parameter, performing weighted correction, and outputting an optimized reconstruction response sequence. According to the method, accurate reconstruction of the real pressure response of the proportional valve can be realized, so that the accuracy and the reliability of response time testing are improved.

The invention discloses an aggregate loading size identification and detection control system based on radar identification, and particularly relates to the field of constructional engineering, which comprises a multi-source sensing module, a feature extraction module, an index calculation module, a threshold judgment module, a logic decision module and a control execution module. Characteristic parameters such as phase difference and coordinate deviation are extracted through multi-modal processing, four kinds of comprehensive indexes such as volume uniformity and overload risk are generated, risk grading early warning is achieved through a three-level threshold system, a control instruction is generated in combination with a state machine model and a logic gate strategy, and the system is provided with an electro-hydraulic proportional valve and a redundant braking mechanism. The system supports multi-stage response from rate adjustment to emergency braking, has the characteristics of multi-dimensional dynamic monitoring, intelligent decision making and environment self-adaption, effectively improves the safety and automation level of bulk cargo loading operation, and is suitable for continuous operation requirements of complex industrial scenes.

The present invention relates to a flow control method, system and apparatus for a gas conveying system, and a storage medium. The method comprises: acquiring an actual pressure value at a gas outlet of a gas conveying system in real time; on the basis of the actual pressure value and a preset pressure value, adjusting in real time a preset upper limit flow of a gas conveyed by the gas conveying system, so as to obtain a target upper limit flow; acquiring an actual flow value at the gas outlet of the gas conveying system in real time; and by means of using a PID control method and on the basis of the target upper limit flow and the actual flow value, controlling a switch proportional valve of the gas conveying system in real time, so as to complete flow control of the gas conveying system. The present invention can achieve dynamic flow control, and involves a rapid and precise dynamic control process and high robustness, thus truly ensuring the safety of surgical operating spaces of medical apparatuses.

The invention relates to the technical field of hoisting construction dynamic safety assessment, and particularly discloses a hoisting construction dynamic safety assessment method, which comprises the following steps of: acquiring operation parameters of a hoisting system in real time through a multi-modal sensor array, and generating a hoisting dynamic parameter set; the lifting dynamic parameter set comprises pressure distribution data of each lifting point, lifting appliance attitude angle data and load space position data; based on the hoisting dynamic parameter set, force system dynamic balance analysis is executed, and the force system unbalance degree of the crane is obtained through analysis; and when the force system unbalance degree of the crane is larger than a set threshold value, an unbalance active correction mechanism is triggered, and unbalance correction is conducted on the crane through adjustment of the electro-hydraulic proportional valve. And the safety and the efficiency of hoisting operation can be obviously improved. The automatic unbalance correction mechanism not only reduces the accident risk, but also improves the operation flexibility and response speed, and provides powerful technical support for modern hoisting operation.

The invention discloses a deep sea underwater integrated electro-hydraulic actuator system adopting pump and valve combination. The deep sea underwater integrated electro-hydraulic actuator system comprises a hydraulic cylinder, a pump control assembly and a valve control assembly. The pump control assembly comprises a metering pump, a first switch valve and a second switch valve; the valve control assembly comprises a large-flow proportional valve, a small-flow proportional valve, a deep sea compensation energy accumulator and a third switch valve. The metering pump, the first switch valve and a rod cavity of the hydraulic cylinder are sequentially connected through a pipeline, the metering pump, the second switch valve and a rodless cavity of the hydraulic cylinder are sequentially connected through a pipeline, the metering pump, the third switch valve and the deep sea compensation energy accumulator are sequentially connected through a pipeline, and the rodless cavity of the hydraulic cylinder is connected with the large-flow proportional valve and the small-flow proportional valve through pipelines. Two control modes of the actuator can be completed, large-flow control is achieved through the pump control assembly, high efficiency and energy conservation are achieved, flow needed by maintenance is supplied to a rodless cavity of the actuator through the valve control assembly via the large-flow proportional valve and the small-flow proportional valve, and posture keeping and emergency action are achieved.

The invention discloses a condensation-free efficient heat exchange control method and system for a full-premixing water heater, and the method comprises the steps: collecting the multi-source information, such as air inlet temperature, humidity, gas flow, flue gas oxygen concentration and wall temperature, in real time, calculating a predicted dew point based on a dynamic dew point prediction model, and setting a dynamic safety boundary; the condensation risk is judged by comparing the wall temperature with the safety boundary, and active intervention is carried out in a staged cooperation mode that fuel gas and air volume are continuously adjusted firstly and then a partial combustion zone sectioning valve is rapidly turned off; the system comprises a main controller, a mesh-shaped infrared radiation burner, a sectional valve assembly, a gas proportional valve, a frequency conversion fan and related sensors. According to the invention, the system runs close to the condensation boundary through intelligent control, and the advantage of high operation heat efficiency is realized on the premise of ensuring high reliability.

The invention discloses an electric propulsion high-pressure fluid micro-flow control system and belongs to the technical field of electric propulsion flow control. The problems that an existing pressure reduction system is poor in control precision and low in reliability when working frequently are solved. An outlet of a gas cylinder is connected with a gas inlet of a proportional valve through a gas transmission channel, and a self-locking valve and a pressure adjusting system are sequentially arranged on the gas transmission channel; the proportional valve is connected with three third electromagnetic valves at the same time and is respectively used for controlling the on-off of the anode branch, the cathode branch A and the cathode branch B; the pressure sensor PIII is arranged at an air outlet of the proportional valve and used for collecting the pressure of the air outlet of the proportional valve; the pressure adjusting system collects the pressure of the gas transmission channel and sends the pressure to the controller, and the controller controls the pressure adjusting system, the proportional valve and the three third electromagnetic valves according to the pressure of the gas transmission channel, the pressure of the pressure sensor PIII and the working mode of the system. The method is suitable for electric propulsion system control.

An apparatus for operating a load-controlled hydraulic supply of an agricultural tractor includes a hydraulic pump which is adjustable with respect to the displacement volume for supplying pressurized hydraulic fluid, a proportional valve which is electrically actuatable, a primary hydraulic consumer to carry out a superordinate hydraulic function and to be directly connected to a conveying outlet of the hydraulic pump, a secondary hydraulic consumer to carry out a subordinate hydraulic function and to be connected to the conveying outlet of the hydraulic pump via the proportional valve, and a control unit configured to move the proportional valve into a closed valve position when the control unit recognizes that at least one of a required power of the primary and secondary hydraulic consumers exceeds the conveying capacity of the hydraulic pump and the subordinate hydraulic function of the secondary hydraulic consumer is inactive.

The invention discloses a miniature proportional valve control method based on active-disturbance-rejection control, and relates to the technical field of miniature proportional valve control, and the method comprises the steps that a target flow set value is received and is used as a control signal to be sent to a control unit, and the control unit comprises a tracking differentiator, an expansion state observer and a nonlinear feedback controller; the tracking differentiator processes the target flow set value to obtain a differential input signal; the expansion state observer receives the differential input signal and the actual flow feedback signal, and estimates the total disturbance of the system in real time to obtain a disturbance estimation value; the non-linear feedback controller combines the differential input signal and the disturbance estimation value to generate a compensation current signal; the compensation current signal is used as a control parameter of the micro proportional valve, and the position of the valve element is accurately adjusted. An active disturbance rejection control algorithm is adopted, the control performance and disturbance rejection are improved, accurate flow control of the micro proportional valve is achieved, and the micro proportional valve is more suitable for industrial application with high requirements.

The invention provides a hydrogen supply control method of a fuel cell system, a controller, a system and a medium, and relates to the technical field of fuel cells. The method comprises the steps that in response to a starting instruction, the opening degree proportion of a first proportional valve is controlled to be adjusted to K11 from K10 through a first PID control parameter, K10 is the opening degree proportion of the first proportional valve which does not allow hydrogen to pass at all, and K11 is the initial opening degree proportion of the first proportional valve at the current environment temperature; obtaining a current actual pile entering pressure value and a hydrogen pile entering pressure set value of the electric pile; the second PID control parameter is used for controlling the opening proportion of the first proportional valve to be adjusted till the deviation between the actual reactor entering pressure value and the hydrogen reactor entering pressure set value is within the allowable error range, and the proportionality coefficient of the first PID control parameter is larger than that of the second PID control parameter. According to the method, the stability of hydrogen pressure is improved, so that the stability and the service life of the fuel cell system are improved.

The invention discloses a UPA pressure automatic compensation system and method for mask substrate polishing. The UPA pressure automatic compensation system comprises a pressure execution module, a distributed sensing feedback network and an intelligent control unit. Wherein the pressure execution module is used for directly polishing a mask base plate and comprises a force application shaft, a polishing head, an air source, a UPA air bag and an electric proportional valve, the distributed sensing feedback network comprises an air path pressure sensor and a tail end contact pressure sensor, and the intelligent control unit receives a collection signal of the distributed sensing feedback network and sends the collection signal to the polishing head. On the basis of a current process formula and process parameter coupling model, a data fusion algorithm, a feed-forward compensation algorithm and a fuzzy PID algorithm are operated to obtain a feed-forward compensation amount and a fuzzy PID output amount, the feed-forward compensation amount and the fuzzy PID output amount are superposed, a total control voltage is generated and output to an electric proportional valve, and then the input air pressure of a UPA air bag is adjusted. Therefore, closed-loop control over the polishing pressure of the mask substrate is achieved. Through multi-sensor data fusion, fuzzy PID self-adaptive control and intelligent feed-forward compensation based on a process parameter coupling model, real-time, accurate and constant control of the polishing pressure is realized, so that the surface precision and yield of the mask substrate are improved.

The utility model discloses a turbo expander test bed suitable for a normal temperature environment. Comprising a profile rack, an electric proportional valve I, an electric proportional valve II, a flow meter I, a large-flow turbine inlet pipeline, a small-flow turbine inlet pipeline, a hydrostatic bearing air supply pipeline, a turbine air inlet main pipeline, a brake fan air inlet pipeline, a brake fan exhaust pipeline, a manual ball valve, a flow meter II, a flow meter III, an electric proportional valve III and an electric proportional valve IV. An electric ball valve I, an electric ball valve II, an electric ball valve III, an electric ball valve IV, a turbine mounting plate and a hydrostatic bearing gas supply tee joint can adapt to normal temperature tests of turbo expanders of different specifications and provide bearing gas pressure needed by a hydrostatic bearing, and real-time monitoring of pipeline flow is achieved through a flowmeter. Precise adjustment of the pipeline pressure is achieved through the electric proportional valve, the test bed effectively solves the problem that related parts need to be replaced repeatedly when turbo expanders of different specifications are tested through a traditional test bed, test convenience is improved, and labor intensity and cost are reduced.

A hydraulic suspension system for a motor vehicle having at least a pair of road engaging wheels. The suspension system includes, a hydraulic cylinder coupled with the each of the pair of road engaging wheels, the hydraulic cylinder defining a cap end volume and a rod end volume separated by a piston. A hydraulic supply circuit for the hydraulic cylinder includes, a high pressure hydraulic source, a low pressure hydraulic drain, a pair of hydraulic sub circuits each coupled to one of the hydraulic cylinder cap and rod end volumes. Each hydraulic sub circuit includes, a proportional supply flow valve coupled with the high pressure hydraulic source and one of the cylinder volumes, a return flow control proportional valve coupled with the low pressure hydraulic drain and the one cylinder volume, and an accumulator coupled to the associated hydraulic cylinder volume through an accumulator fill control proportional valve.

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.

According to the technical scheme, the underwater rotary hydraulic proportional valve is characterized in that the underwater rotary hydraulic proportional valve comprises a valve body, a steel sleeve, a shell, a coil, a magnet yoke, a stator iron core, an inner end cover, a sealing ring a, a dustproof screw, a sealing ring b, a rotary transformer, a permanent magnet, a sealing ring c, a valve sleeve, a valve element, a bearing and a sealing ring d, and is characterized in that a plurality of hydraulic oil ports are formed in the valve body; the hydraulic oil port is communicated with the oil port through the multiple valve cavities, the shell is installed at one end of the valve body, a driving cavity is formed in the shell, and the valve element and a rotating shaft of the motor are integrated. The wet-type limited angle torque motor is adopted to drive the rotary valve and the valve element to rotate, a motion conversion device is omitted, the valve element and the valve sleeve rotate relatively, friction force is small, the anti-pollution capacity is high, the axial leakage problem does not exist, a motor shaft of the limited angle torque motor can rotate within a limited angle range, and the advantages of being convenient to control, large in torque density, high in reliability and the like are achieved. And the method is simple and reliable.

The invention discloses a hydraulic system applied to an accessory and swing arm deflection of an excavator and the excavator. The hydraulic system comprises a controller, a proportional valve, a main control valve, a reversing valve, a main pump, a swing arm deflection oil cylinder and accessories. The controller is connected with a right input part and a left input part; the proportional valve is electrically connected with the controller, and the proportional valve is electrically connected with the main control valve; the main pump is communicated with the main control valve through an oil way, the main control valve is communicated with the reversing valve through an oil way, and the movable arm deflection oil cylinder and the accessory are both communicated with the reversing valve through an oil way. The controller controls the opening degree of the proportional valve, and the proportional valve controls the opening degree of the main control valve. According to the auxiliary small and movable arm deflection hydraulic system applied to the excavator, the controller and the proportional valve are additionally arranged, the main control valve is controlled through the proportional valve, and the controllability of two actions meeting the customer requirements is achieved in the same valve element state. In addition, the maximum flow of rotation of the accessory can be set through the controller, the maximum rotation speed of rotation of the accessory is adjustable, and different rotation speed requirements of customers are met.

The invention belongs to the technical field of cigarette production, and particularly relates to a dynamic control system and method for sliver removal of a cigarette making machine, and the system comprises a sliver removal amount detection mechanism which detects the sliver content in discharged materials in real time; the feedback adjusting mechanism comprises an electric proportional valve and an opening degree adjusting mechanism which are respectively used for adjusting the air pressure, the air volume and the opening degree of the air inlet; and the controller is in communication connection with the detecting mechanism and the adjusting mechanism, adjusts the winnowing parameters according to the sliver content signal, communicates with the MES system and realizes data uploading and process parameter receiving. The system realizes dynamic closed-loop regulation of air pressure and air volume, reduces manual intervention, and improves control precision and response speed.

The invention provides an electric proportional valve and a control method, the electric proportional valve comprises a valve body and a control unit, and the valve body is provided with a gas inlet pipeline connected with a gas source, a gas outlet pipeline connected with a gas load and a gas exhaust pipeline communicated with the external environment; the control unit adjusts the proportion of the gas amount entering the gas outlet pipeline and the gas exhaust pipeline from the gas inlet pipeline based on closed-loop feedback control; a gas release pipeline is further arranged in the valve body, and part of gas in the gas outlet pipeline can be discharged to the external environment in the mode that the gas amount participating in closed-loop feedback control in the gas outlet pipeline is reduced. According to the electric proportional valve, the air pressure oscillation phenomenon of the air outlet pipeline under the low-flow and high-frequency switching air using demand scene can be remarkably reduced, and rapid, accurate and stable tracking of the target air pressure is achieved.

The utility model belongs to the technical field of glass fiber wire drawing machines, and particularly relates to a rear-end disc type wire drawing machine head capable of automatically adjusting and avoiding a wire drawing resonance area on line. The device comprises a machine head main shaft, a bearing seat, a cylinder body, a piston, a front seat, a rear seat, a barrel replacing body and a vibration reduction component, when the machine head operates, the bearing seat, the cylinder body, the piston, the front seat, the rear seat, the barrel replacing body and the vibration reduction component form an online rigid adjusting mechanism for the soft support of the machine head. The vibration of the machine head can be detected in real time through the vibration sensor and fed back to the PLC for control, the gas flow and / or the gas pressure are / is adjusted through the proportional valve PID, online real-time data collection and exchange are achieved, dynamic closed-loop control over the machine head rigidity adjusting mechanism on the bearing seat is achieved, and the vibration of the machine head is controlled within an acceptable range all the time.

The invention relates to a new energy extended-range automobile thermal management system and a control method, and belongs to the field of automobile air conditioners. The system comprises a refrigerant loop and a cooling liquid loop, and heat management functions of a passenger compartment, a battery, an electric drive and an engine are achieved through multi-loop collaborative design. The refrigerant loop comprises first to fifth refrigerant loops, a core component is a compressor, the flow direction of a refrigerant is controlled through an electromagnetic valve and a one-way valve, and passenger compartment cooling, battery cooling and waste heat recovery are achieved. The cooling liquid loop works cooperatively with a water pump through a three-way proportional valve, and electric heat dissipation, engine heat dissipation and battery heating are achieved. Through the high coupling design of the refrigerant loop and the cooling liquid loop and the multi-target cooperative control strategy, the comprehensive efficiency and applicability of thermal management are remarkably improved, the electric energy consumption is reduced, the endurance mileage of the vehicle in a pure electric mode is prolonged, and the reliability and maintainability of the system are enhanced.

The invention discloses a nonlinear flutter control method considering high-dynamic low-hysteresis and micro-motion characteristics of a proportional valve, and belongs to the field of proportional valve control. The method comprises the following steps: acquiring a detection signal of a controlled proportional valve in real time, and performing mean filtering processing on the real-time detection signal to filter a flutter part so as to obtain a basic detection signal; the controller obtains the valve front and valve back pressure difference, the target control signal current and the basic detection signal of the current proportional valve; the frequencies and the amplitudes of the driving control signal and the optimal flutter control signal are obtained; and the driving control signal and the flutter control signal finish addition operation in the controller to obtain an equivalent control signal, so that the control of the controlled proportional valve is realized. The method is applied to a closed loop feedback link, and hysteresis can be greatly reduced. Under the control method, the valve element is always in a macroscopic stable and microcosmic jittering state, so that the speed of responding to a control signal is higher, the dead zone and saturation zone range of a proportional valve current-displacement curve can be reduced, and the linearity is higher.

A proportional valve includes a casing and a valve trim. The casing has at least one fluid inlet, a fluid outlet, at least one first connection passageway, at least one second connection passageway and an accommodating space. The first connection passageway is connected with the fluid inlet. The second connection passageway is connected with the fluid outlet. The valve trim is located in the accommodating space, including a flow splitter an adjusting rotor. The flow splitter has at least one third connection passageway and at least one fourth connection passageway. The third connection passageway is connected with the first connection passageway. The fourth connection passageway is connected with the second connection passageway. The adjusting rotor has a channel and at least one blocking portion. The adjusting rotor is rotatably disposed on the flow splitter so that the blocking portion blocks a part of the third connection passageway.