73results about How to "Fulfill control requirements" patented technology

The invention relates to a dynamic point-the-bit rotary steering drilling tool. The dynamic point-the-bit rotary steering drilling tool comprises a rotary outer cylinder, a stable platform, a steering offset mechanism, a bit pressure transfer mechanism, a torque transfer mechanism, an upper support plate, a lower support plate, a drill shaft, a drill bit, a sealed corrugated pipe, a drill shaft connecting bearing and a conductive slip ring, and is characterized in that the rotary outer cylinder is used for directly applying bit pressure and torque on the drill bit and driving the drill shaft and the drill bit to rotate jointly, information of hole deviation angle and azimuth angle to be controlled can be calculated by a calculating unit according to a preset borehole trajectory parameter or a remote control command of a ground monitoring system, and precision control of bend angle, in particular to the hole deviation angle and the azimuth angle of the offset mechanism can be realized by adopting a geostationary control method of the stable platform and combining with working principles of a hydraulic drive piston and the steering offset mechanism.

The invention discloses a method for preparing nanometer calcium carbonate, employing reversed phase and microemulsion system for reaction in liquid to prepare cubic crystal nanometer calcium carbonate. It mainly comprises following steps: mixing hydrocarbon solvent, emulsifying agent and alcohols; adding water-soluble calcium salt solution on condition of stirring; then adding emulsifying agent and stirring continuously, getting transparent emulsion; then adding solid powder of water-soluble carbonate and getting nanometer calcium carbonate emulsion; and getting final product after saponification. The invention changes the air-solid reaction between carbon dioxide and calcium hydroxide to reaction in liquid, which avoids mass transfer for air and liquid in current process; the calcium ion and carbonate positive ion are only used as carriers and do not consume chemical substance, which can reduce production cost; and the reverse microemulsion is used as reaction medium, which can short process and reduce investment. The cubic crystal nanometer calcium carbonate is characterized by homogenous crystal system and granular size.

According to the industrial intelligent control system based on software definition provided by the invention, computing power optimization scheduling and dynamic reconstruction can be realized in a software definition manner, resources are allocated to different industrial control tasks and edge computing tasks as required, and an edge intelligent controller with differentiated control and computing capabilities is constructed; meanwhile, a real-time industrial control task and a non-real-time edge intelligent calculation task are supported, and the method has great significance and practicalvalue for improving the utilization rate of industrial edge equipment resources, improving the overall edge service capability and reducing energy consumption. Besides, real-time control and non-real-time computing task requirements of industrial intelligent control, edge computing, industrial AI and the like can be met, platform capabilities of an edge side and a cloud side are broken through, the method has the advantages of fusion, intelligence, real-time performance and flexible expansion, and a brand-new solution which is efficient, differentiated, low in cost, space-saving and easy to maintain is provided for industrial intelligent control.

The invention relates to a balance car which comprises a first wheel, a second wheel, a connecting shaft, a first pedal mechanism, a second pedal mechanism, angle motion detection mechanisms and control mechanisms. The first wheel and the second wheel can independent from each other and are arranged on the connecting shaft in a rotatable mode. The first pedal mechanism and the second pedal mechanism are arranged on the connecting shaft in a rotatable mode. The first pedal mechanism is connected with the first wheel in a matched mode, and the second pedal mechanism is connected with the second wheel in a matched mode. The angle motion detection mechanisms are arranged on the first pedal mechanism and the second pedal mechanism respectively. The control mechanisms are in communication connection with the angle motion detection mechanisms. The balance car has the advantages of being convenient to control, easy to popularize, high in safety and small in size.

The invention relates to a visual programming tool based on a flow chart. The visual programming tool comprises an equipment data loading module, a flow chart drawing interface, a control content auxiliary input module, a dynamic detection module, a model warehouse module and a code generation module. The equipment data loading module is provided with a universal building equipment standard data set. The flow chart drawing interface is used for drawing a functional flow chart. The control content auxiliary input module is used for acquiring control variables in the labeled data set and inputting and editing control variable contents. The dynamic detection module is used for carrying out dynamic detection on the flow chart drawing interface, monitoring a logic relation between controls in the flow chart and a control content input result in real time in the flow chart drawing process, and prompting control operation. The model warehouse module is used for storing or reading the flow chart drawn by the flow chart drawing interface. And the code generation module is used for converting the drawn flow chart into program codes which can be directly executed.

The invention provides a high-temperature corrosion and erosion testing device of a bent pipe column of an oil well pipe. The high-temperature corrosion and erosion testing device comprises an erosion and corrosion channel, an electrochemical work station and a storage tank, wherein the storage tank comprises a storage tank secondary cavity and a storage tank main cavity, which are arranged in sequence from bottom to top; the upper end of the storage tank secondary cavity is communicated with the upper part of the storage tank main cavity through a connection channel, and a secondary temperature controller is arranged at the bottom of the lower end of the storage tank secondary cavity; the erosion and corrosion channel comprises an erosion and corrosion box body, and the two ends of the erosion and corrosion box body are communicated with the storage tank main cavity through a main pipeline and a main loop respectively; the erosion and corrosion box body is provided with a plurality of sample mounting holes; the main pipeline is communicated with the storage tank main cavity through a gas pipeline and a liquid pipeline, which are arranged in parallel; a gas flow controller and a gas control valve are arranged on the gas pipeline connected onto the upper part of the storage tank main cavity respectively; a liquid flow controller and a liquid control valve are arranged on the liquid pipeline connected onto the lower part of the storage tank main cavity respectively; the upper end of the gas flow controller is connected with the upper end of the liquid flow controller through a communication pipeline and the communication pipeline is provided with a regulating and controlling valve; and the electrochemical work station is connected with a sample.

The invention discloses a carbon fiber integrated laying device. The device comprises a material supply unwinding mechanism, a guide mechanism, a tension adjusting mechanism, a tension measuring mechanism, a re-feeding mechanism, a clamping mechanism, a shear mechanism and a compaction mechanism located below the bottom plate, wherein the material supply unwinding mechanism, the guide mechanism, the tension adjusting mechanism, the tension measuring mechanism, the re-feeding mechanism, the clamping mechanism and the shear mechanism are located above the bottom plate. Fibers on the material supply unwinding mechanism pass through the re-feeding mechanism, the clamping mechanism and the shear mechanism and then are compacted and cured on the surface of a mold through the compaction mechanism, in the above transmission process, guidance through the guide mechanism is achieved, the fiber bundle tension is adjusted passively through the tension adjusting mechanism, and the fiber bundle tension is measured through the tension measuring mechanism. Through elastic force effect of a spring, the distance between a compaction roller of the compaction mechanism and the surface of the mold can be passively adjusted, and therefore the device can meet the mold laying requirements of different curve faces and control requirements of a monofilament bundle.

The invention relates to a snorkeling control method for a cable-free autonomous underwater vehicle. The method comprises the following steps: acquiring longitudinal inclination angle and vertical velocity signals via a sensor installed on the robot, transmitting the inclination angle and vertical velocity signals to an extended state observer as feedback signals to obtain estimated values of longitudinal inclination angle, longitudinal inclination angle rate, vertical velocity and total system disturbance, and filtering the set values of the longitudinal inclination angle and the vertical velocity via a tracking differentiator to obtain filtered tracking values and differential values; separately subtracting the longitudinal inclination angle and the differential value thereof from the estimated values of the longitudinal inclination angle and the longitudinal inclination angle rate, and then inputting the differences to a nonlinear state error feedback control law, wherein the output of the control law and the compensation of the disturbance estimated value form a longitudinal inclination angle control quantity; similarly, performing corresponding processing on the vertical velocity to obtain a vertical velocity control quantity. Thus, complete decoupling control of the longitudinal inclination angle and the vertical velocity is realized, the control requirement for snorkeling motion of the underwater vehicle at a given longitudinal inclination angle and a given vertical velocity is met, and a technical guarantee is provided for fixed point vertical section observation of the underwater vehicle.

The invention discloses a control system of a logging drilling sidewall coring tool. The control system comprises a drilling coring ground control box, a winch depth device, a variable frequency power source, a downhole instrument circuit part and a downhole instrument hydraulic part, wherein data acquisition and feedback control are performed on the coring tool through the drilling coring ground control box, various states of a downhole instrument can be detected in time through the downhole instrument circuit part, the power supply state of a downhole motor and the power supply state of the downhole instrument are monitored through a sensor, and the downhole motor can be adjusted and controlled by processing acquired data and controlling the variable frequency power source. According to a control method, automatic control over coring of the coring tool is achieved through the ground control box, an execution motor can be continuously started, a backup arm expands, the stretching displacement of a punch pin is minimal, the pressure of a second pump is maximal, a hydraulic motor rotates, a drill bit stretches out, the hydraulic motor stops rotating when the drilling displacement reaches the core breaking position, and a series of continuous actions that the core breaking drill bit retreats and is taken back is completed.

The invention relates to a servo controller of a dual-DSP-based 3-DOF (degrees of freedom) planar motor. The servo controller comprises a master control unit and a slave control unit, which respectively comprise a DSP chip, an optical coupling driving isolation module, a full-bridge power driving module and a position sensor module. The DSP chip of the master control unit transmits a PWM signal, controls the full-bridge power driving module to output 6-phase planar motor driving current after optical coupling isolation and collects the X-coordinate position of the two-path planar motor by a laser position sensor; the DSP chip of the slave control unit transmits a PWM signal, controls the full-bridge power driving module to output 6-phase planar motor driving current after optical coupling isolation and collects the X-coordinate position of the one-path planar motor by the laser position sensor; the DSP chips of the main control unit and the slave control unit exchange synchronous control signals in real time through a CAN bus and use a 3-DOF synchronous control strategy to control the planar motor to realize fast and accurate positioning of the degree of freedom on X coordinate, Y coordinate and Theta Z.

The invention provides a low-frequency mass tuning and vibration-damping device and a regulating method for the same, and relates to the field of vibration control on large-span bridge structures. A rotating shaft rack is arranged on a support; a rotating shaft is perpendicularly connected with a lever through a bearing; a mass block is arranged at one end of the lever; a frequency regulating spring and a damper are respectively connected with the lever and the support; each pair of spring mechanisms is sleeved on the rotating shaft and is symmetrically arranged on two sides of the lever; the turning direction of a far-end flat spiral spring of each spring mechanism is the same with that of a near-end flat spiral spring of the spring mechanism; the far-end flat spiral spring and the near-end flat spiral spring of each spring mechanism are parallel to each other; and a worm gear and worm mechanism is arranged at one end of the rotating shaft. The worm gear and worm mechanism rotates, and the position of the frequency regulating spring is changed, so that the frequency of the low-frequency mass tuning and vibration-damping device is a set value. By using the low-frequency mass tuning and vibration-damping device and the regulating method for the same, vibration control on a large-span bridge with low controlled frequency can be realized.

The invention discloses a device and a method for demand control of a two-way power supply system. A power flow regulator composed of an isolation transformer, a series-side inverter and a parallel-side inverter is connected in parallel to a spare power automatic switching bus tie switch between two power supply buses powered by a two-way power supply. When the sum of real-time demands of the twopaths in the two-way power supply exceeds a total demand limit value, the power flow regulator transfers the energy of one power supply bus to the other power supply bus. Thus, the sum of the total demand of the system, namely, the demand of a user metering point, is reduced, the basic electric charge is reduced, and the electric energy demand of the load can be ensured to be met. Various problemsfaced by other demand controllers in the current market can be solved, for example, the load stability is affected due to the fact that the demand is reduced by reducing the load power. The control difficulty and the equipment maintenance amount are reduced, the service life of the equipment is prolonged, and the economic benefit is very good.

The invention discloses a device and a method for modulating the frequency of a generator set of the device. According to the device, an isolation cascaded transformer and a cascaded convertor are additionally arranged between a machine end of a generator and a low-voltage side of a boosting transformer of a grid connection point, a shunt-wound convertor is additionally arranged on a low-voltage side of the machine end of the generator or the low-voltage side of the boosting transformer of the grid connection point, the cascaded convertor and the shunt-wound convertor are connected together through a public bus, and the cascaded convertor is used for dynamically regulating a cascading compensation output voltage according to the real-time response of technical requirements on the frequencymodulation of the generator set so as to realize the active power regulation of the frequency modulation requirements; and the shunt-wound convertor is used for stabilizing a direct current bus voltage and timely responding to reactive power control requirements of a system. The device has the advantages that various problems during the frequency modulation of the generator set at present can besolved, the comprehensive response speed is high, the modulation precision is high, the device has good coordination control capability with an existing automatic generation control AGC system, the equipment maintenance amount is reduced, the service life of a machine set is prolonged, and the device has very good economic benefits.

The invention discloses a high-speed sorting system and a method for realizing precise delivery and precise sorting. The high-speed sorting system comprises an annular line, a bracket for supporting the annular line, more than one electric trolley mounted at an upper end of the annular line for transporting postal parcels, a parcel supplying platform for loading the postal parcels, and a sorting port for sorting the postal parcels, wherein at least one sorting port is formed in an outer side end of the annular line and is arranged adjacent to the electric trolley; a high-performance reflective photoelectric switch for zero detection of a trolley and a trough type switch for judging the number of passing trolleys are further arranged at a bottom position on the annular line. The control solution in the invention is high in precision, easy to realize, low in requirement on speed stability of the annular line and the electric trolley, simple in structure, and lower than visual positioning in cost.

A seat heating and ventilating device and a control method relate to the field of vehicle heating or ventilating devices. A seat heating and ventilating control circuit of the device controls seat heating and ventilating or only controls seat heating or only controls seat ventilating according to a request. As the seat heating and ventilating control circuit can output two PWM signals, any combination of heating and ventilating can be realized, the seat heating and ventilating control circuit can satisfy the control demands of different configuration models for seat heating and ventilating, and the development of controllers and even finished vehicles is reduced greatly. Meanwhile, the seat heating and ventilating device is reasonable in design, small and light, the device can be arranged according to different models and different configuration requirements of vehicle OEMs, and the development cost of OEMs is greatly reduced.

The invention discloses a water heater, a control system and method of the water heater and a bathroom mirror. The control system comprises the water heater and the bathroom mirror. The bathroom mirror is connected with the water heater through a power carrier line so as to establish communication connection between the bathroom mirror and the water heater. The bathroom mirror comprises an input module and a control module. The input module is used for receiving user input instructions, and the user input instructions at least include the temperature setting instruction and the mode setting instruction. The control module is connected with the input module. The control module is used for generating corresponding control instructions according to the user input instructions and sending the control instructions to the water heater so that the water heater can execute the control instructions, and is also used for receiving feedback information of the water heater. According to the control system of the water heater in the embodiment of the invention, the water heater in a bathroom can be controlled, meanwhile, the distance problem of wireless communication can be solved, and thus user experience can be improved.

The invention discloses a system for improving the flexibility of outlet temperature adjustment of a coal mill. The system comprises a primary air fan (1), an air preheater (2), the coal mill (3) anda bypass cold air pipeline (4), wherein the outlet of the primary air fan (1) is divided into two paths, one path is communicated with the inlet of the coal mill (3), the other path is communicated with the inlet of the air preheater (2), the outlet of the air preheater (2) is communicated with the inlet of the coal mill (3), and the bypass cold air pipeline (4) is communicated between the inlet and the outlet of the air preheater (2). The bypass air pipelines are additionally arranged on the front pipeline and the rear pipeline of the primary hot air side of an original air preheater, so thatthe primary air volume entering the air preheater for heating is adjustable, when the moisture of coal for actual combustion is low, the primary air volume entering the air preheater is reduced through the arranged bypass air channels, the primary air-hot air ratio of the inlet of the coal mill is reduced, and the outlet temperature of the primary air-powder mixture is ensured to meet the designrequirement.

The invention provides central monitoring equipment of an intelligent wind farm and a turbine monitoring method of the intelligent wind farm. The central monitoring equipment comprises a user instruction interaction module, a control module and a data communication module; the user instruction interaction module is used for receiving user instructions; the control module is used for generating operation instructions according to the received user instructions; the data communication module is used for being connected with a wind turbine of the wind farm through a communication line, the data communication module sends the operation instructions to the wind turbine in the wind farm or receives information from the wind turbine, and the control module executes data statistical operations corresponding to the operation instructions according to the information of the wind turbine, received by the data communication module. According to the equipment and method, turbine control and data statistics can at least be performed through the user instructions, operation modes can be simplified, operation time can be shortened, and the equipment and method are convenient for user to use.

The invention discloses a method for confirming the inclination angle of a powerless hypersonic flight vehicle. The method comprises the following steps: setting a flight track coordinate system; calculating a transformation matrix from a launching inertial system to the flight track coordinate system according to inertial navigation parameters; calculating a transformation matrix from the flight track coordinate system to an elastic body system according to a transformation matrix from the launching inertial system to the elastic body system and the transformation matrix from the launching inertial system to the flight track coordinate system; calculating an inclination angle of an aircraft relative to the flight track coordinate system according to the transformation matrix from the flight track coordinate system to the elastic body system. By adopting the method for confirming the inclination angle of the powerless hypersonic flight vehicle, logic inclination angles of the powerless hypersonic flight vehicle for turning left or turning right can be relatively visibly and accurately obtained.

The invention discloses a multichannel control device used for a hydraulic vibration test system. The multichannel control device comprises an upper computer and a lower computer which is electrically connected with the upper computer. The lower computer comprises a power board card, a processor board card and a signal conditioning board card. The power board card provides a DC power supply. The processor board card is used for completing signal acquisition, processing and control computation. The signal conditioning board card is used for signal conditioning. The power board card comprises a power supply output interface. The power board car is connected with the processor board card through the power supply output interface. The processor board card comprises a network port circuit, multiple hybrid interfaces and a digital interface. The processor board card receives instructions and parameters issued by the upper computer through the network port circuit and uploads the data to the upper computer and is electrically connected with the a signal conditioning board card through the hybrid interfaces. The device is simple and feasible in operation, stable and reliable and high in universality and can be widely applied to various hydraulic vibration test systems.

A visible light communication device based on LED projection comprises a light source module, a primary light source outer cover, an optical element device and a secondary light source outer cover. The light source module is used for emitting LED light, and is controlled by a drive circuit to achieve the illumination and communication functions at the same time. The light source module is fixed to the inner wall of the rear end of the primary light source outer cover, and the LED light convergence function is achieved. The optical element device is fixed to the front end of the primary light source outer cover, and is used for controlling the definition and size of a projection image. The secondary light source outer cover is fixed to the front end of the optical element device, and is adopted as an LED projection and illumination distance and range adjusting component. The visible light communication device has the advantages of being relatively simple in module structure, relatively small in size and large in application area and saving cost.

The invention discloses an indoor secondary airflow device used in large-space and large-span buildings and is characterized in that an air inlet is arranged on one lateral wall or the bottom of a case, an air outlet is arranged on the other lateral wall of the case, the air inlet is communicated with an air inlet chamber that is communicated with a fan entrance, and a fan air outlet is sequentially connected with a guide chamber, an air outlet section and the air outlet; a guide plate 1 is connected on an inner wall under the fan air outlet and divides the guide chamber into an upper cavity and a lower cavity that are communicated, a guide plate 2 is arranged between the lower cavity and the air outlet section, and the lower cavity is communicated with the air outlet section and the air outlet. A flashboard is arranged on the lateral wall of the air outlet and connected with a guide plate 3 by two arc skid shoes. An advertising lamp box is arranged on the lateral wall of the case. The secondary airflow device of the invention has the effects of transferring primary air feeding energy and separating upper and lower regions with and without an air conditioner, thus leading the environment of the lower air conditioner region to be uniform and comfortable.

The invention provides a control method for smart homes. The control method includes the six steps that a smart host, a terminal mobile phone and a control end mobile phone are arranged; a WeChat APP is installed on the terminal mobile phone; a WeChat APP is installed on the control end mobile phone; an instruction receiving account and a control account are added to each other as friends, and then an instruction is issued to the smart host through WeChat. Through the mobile phone WeChat, controlled electric appliances at home are controlled, carrying, learning and using are convenient, and the control method facilitates independent control operation of multiple persons.

The invention provides a Kicker magnet power supply control system which comprises multiple injection and extraction links, the key is CSRM extraction and CSRE injection systems, and time control precision directly affects injection and extraction efficiency of beams. The advanced ARM+FPGA technology is used to realize precise control of a kicker power supply system, and the time control precisionreaches an ns level. An ARM mainly realizes the download and upload of control data, and the control timing of a kicker system is mainly accomplished through FPGA programming. Remote timing control signals are transmitted through an optical fiber, at the same time, the voltage giving of the kicker power supply is realized by using the digital potentiometer technology, and the giving precision reaches 0.1%.

The invention discloses a motor control device of a photovoltaic cleaning device, which includes a MCU control circuit, a relay contact commutation circuit, A thyristor contactless drive circuit and aDC 220V controllable power supply, the MCU control circuit is connected with the relay contact commutation circuit, The thyristor contactless driving circuit, and the DC 220V controllable power supply, the DC 220V controllable power supply is connected with the thyristor contactless driving circuit, and the thyristor contactless driving circuit is connected with the relay contact commutation circuit. The invention adopts the contactless driving circuit composed of thyristor and the contact commutation circuit composed of relay, The motor control requirement is perfectly realized, which not only has the fast switching speed of the contactless driving circuit, but also completely avoids the strong spark of the contact commutation circuit formed by the relay when the contact is switched, sothat the mechanical contact of the relay will not be invalidated due to ablation, and the design difficulty is obviously reduced.

The invention relates to an IGBT single-tube inversion manual arc welding machine and a circuit structure of the IGBT single-tube inversion manual arc welding machine. After a pin sheath sleeves an IGBT and a fast recovery diode, the IGBT and the fast recovery diode are welded to a main circuit board, the manufactured main circuit board is coated with insulating paint, a digital display meter anda control panel of the digital display meter are placed into a protective cover of the digital display meter and control panel, and dustproof protection treatment is carried out in the manner of pouring an epoxy filling material, so that circuit failure caused by the invasion of conductive dust is prevented. A large-air volume high-speed direct-current cooling fan is arranged, and an air duct formed among the main circuit board, a heat dissipation device of the IGBT and a heat dissipation device of the fast recovery diode is utilized, so that the cooling efficiency of heating main power key parts is improved, the load duration rate of the welding machine is improved, and the problem that the welding time is short is solved. Due to the adoption of novel control circuits of electrifying buffering and overvoltage protection, IGBT driving, a switching power supply, over-heat protection, output voltage and the like, the control and protection functions of the welding machine are better realized.

The invention discloses a slave controller based on an active module in an active hybrid filter device, and belongs to the technical field of electric reactive power compensation devices. An output end of a signal sampling and conditioning circuit is respectively connected with input ends of an ADC (analog-to-digital converter) sampling and serial port communication unit and a hardware protection circuit, the ADC sampling and serial port communication unit is bidirectionally connected with a CPLD (complex programmable logic device) control and communication unit, an output end of the hardware protection circuit is respectively connected with input ends of the ADC sampling and serial port communication unit and the CPLD control and communication unit, an output end of a power supply and power isolation circuit is respectively connected with input ends of the signal sampling and conditioning circuit, the ADC sampling and serial port communication unit, the hardware protection circuit, the CPLD control and communication unit and an output and state feedback unit, and the CPLD control and communication unit is bidirectionally connected with the output and state feedback unit. The slave controller has the advantages of wide application range, high accuracy, high speed, high anti-jamming capability and the like.

The invention discloses a control architecture suitable for an iron core magnetic circuit multiplexing electrical system, which multiplexes an iron core magnetic circuit into a common channel of an electromagnetic field, an electromagnetic wave and a combination of the electromagnetic field and the electromagnetic wave, so that an iron core of iron core magnetic circuit multiplexing equipment becomes a carrier of a multifunctional channel, and the constructed iron core magnetic circuit multiplexing electrical system has the advantages that the practicability is high; the central controller can control the electrical subsystem of the iron core magnetic circuit multiplexing equipment through the distributed controller while the requirements of ultra-high power, ultra-high speed and integration of multiple functions can be met, and the control requirement of a comprehensive electrical system is met. The control architecture comprises: an electrical subsystem of an iron core magnetic circuit multiplexing device, wherein an iron core of the iron core magnetic circuit multiplexing equipment is used as a magnetic circuit multiplexing channel of an electromagnetic field, an electromagnetic wave and a combination thereof; a central controller and a distributed controller, wherein the central controller establishes communication with the distributed controller, the distributed controller corresponds to the electrical subsystem and the central controller controls the electrical subsystems through the distributed controllers.

The invention relates to an electro-hydraulic servo control device, in particular to a PID (proportion integration differentiation)-regulation-based double-closed loop electro-hydraulic servo control device, which comprises an outer-loop PID regulation module, an outer-loop feedback conditioning circuit, an inner-loop PID regulation module, an inner-loop feedback conditioning circuit and a power amplification circuit, wherein the outer-loop PID regulation module is connected with the outer-loop feedback conditioning circuit and the inner-loop PID regulation module respectively; the inner-loop PID regulation module is connected with the inner-loop feedback conditioning circuit and the power amplification circuit respectively. According to the device with the structure, a double-closed loop control structure is arranged, the outer-loop feedback conditioning circuit and the inner-loop feedback conditioning circuit are connected with an external sensing part respectively when the device is used, and two closed loop structures can be used for meeting the control requirements of a tertiary servo valve, and simultaneously achieving compatibility with a secondary servo valve which can be controlled in a single-loop way, so that the applicability is improved; due to the adoption of a PID regulation technology, the dynamic response and the stability of a system are improved.

The invention relates to a multimedia control method and device, a function key and a vehicle. The method comprises the steps of: acquiring a sound signal transmitted by the function key, wherein thesound signal is generated in response to the control operation of a user to the function key, with the frequency of the sound signal corresponding to the control operation; converting the acquired sound signal into a control instruction according to a corresponding relationship between a preset sound frequency and the control instruction; and sending the control instruction to a multimedia controller so as to enable the multimedia controller to execute the control instruction.