59results about How to "Guaranteed control stability" patented technology

The invention discloses a communication control method and apparatus for an unmanned aerial vehicle. The method comprises the steps of: detecting whether network parameters corresponding to a current network meet preset conditions; when the network parameters meet the preset conditions, generating a network switching request of a communication network; sending the network switching request to a control terminal; and if receiving a switching confirmation instruction returned by the control terminal in a preset time period, according to the switching confirmation instruction, switching the current network into a target network. Namely, when the unmanned aerial vehicle detects that the current network is interfered, the unmanned aerial vehicle generates the communication network switching request and fulfills the communication network switching aim by communication with the control terminal, so that the problem that the unmanned aerial vehicle is out of control due to interference to the communication network can be avoided, thereby improving control stability and safety of the unmanned aerial vehicle.

An apparatus and method for controlling a linear compressor and a linear compressor and a refrigerator having the same are provided. The apparatus may include a drive configured to drive the linear compressor based on a control signal, a detector configured to detect a motor current of the linear compressor, an asymmetric current generator configured to generate an asymmetric motor current by applying a current offset to the detected motor current, and a controller configured to generate the control signal based on the asymmetric motor current. The current offset may be changed based on a change in a position of a piston of the linear compressor.

The invention discloses a distributed type hybrid power system based on an aviation piston engine and belongs to the technical field of aerospace. The distributed type hybrid power system is mainly composed of the aviation piston engine, a coaxial type electric generator, fuel tanks, a rectifier, a system controller, motors, propellers and the like. The aviation piston engine generates power to drive the coaxial type electric generator to generate electricity, and through conditioning of the rectifier, electric energy of the electric generator or a standby battery is distributed by a system management module to the motors to drive the propellers to generate thrust or lift force.

The invention discloses a dual-driving servo control device of a large-torque serial swing table. A rolling outer frame of the swing table is driven by double motors, and a pitching inner table top of the swing table is driven by double swing cylinders. A control device comprises an upper computer, a lower computer, a servo control cabinet and a rotary angular displacement sensor. The servo control cabinet is internally provided with a servo controller, a bus communication card, a data collection card, a signal conditioning module and a power amplification module. Control methods include a dual-driving control method of the double motors and a dual-driving control method of the double swing cylinders. According to the invention, the dual-driving servo control methods of the large-torque serial swing table comprises the dual-driving control method of the double motors and the dual-driving control method of the double swing cylinders, and an angular displacement feedback differential inhibition method and a gravitational torque compensation method are utilized, so that the control stability is effectively ensured, and the control precision and the angular displacement waveform distortion degree are improved.

The invention provides a belt type cam phaser. The belt type cam phaser comprises a belt pulley (1), a rear cover plate (2), a rotor (3) and a shell structure, wherein the rear cover plate (2) and the shell structure are connected for forming a working cavity in a sealed mode, the rotor (3) is installed inside the working cavity, and the belt pulley (1) is located on the outer side of the rear cover plate (2) and is connected and fixed to the rear cover plate (2). The working cavity can be formed by connecting a shell (7) and the rear cover plate (2) in a sealed mode or connecting the shell (7), a front cover plate (6) and the rear cover plate (2) in a sealed mode. According to the belt type cam phaser, the belt pulley actually is not involved in sealing of the working cavity of the belt type cam phaser, and therefore the belt pulley avoids the possibility of external leakage of powder metallurgy, the phenomenon that a belt type cam phaser assembly leaks due to the belt pulley is effectively prevented, and the response speed, the control accuracy and the control stability of the belt type cam phaser assembly are guaranteed.

The invention discloses a course control method for reducing invalid steering. The method comprises the steps of calculating a broad-spectrum wave filter coefficient; resolving a coefficient matrix required in the step of control component filtering; and carrying out a Kalman filtering state quantity calculation step. A result provides a step of calculating a basic control quantity and the step ofcontrol component filtering, because the basic control quantity and the filtering control component are calculated at the same time, large-phase lag caused by the fact that a band elimination filteris adopted for filtering firstly and then participates in calculation of the control quantity can be avoided, and therefore the control precision and stability of a ship course control system can still be guaranteed during filtering. After the calculated final rudder control quantity is sent to a steering engine control unit, effective control over the course can be achieved at a low steering frequency under the interference of stormy waves, and mechanical abrasion of ship steering engine equipment can be reduced.

The invention provides a production method of high-quality PPTA (poly(p-phenylene terephthalamide)) resin and a PPD (p-phenylenediamine) stirring vessel, and belongs to the technical field of polymermaterials. The method for obtaining the high-quality PPTA resin comprises the following steps: blending of an NMP/CaCl2 complex solvent; preparation of a PPD solution; measuring of TPC (terephthaloylchloride); condensation polymerization; blank treatment. The PPD stirring vessel is also provided, PPD dissolution parameters such as temperature, stirring speed, dissolution time and the like are optimized, and all PPD can be dissolved and participate in the condensation polymerization. Pre-polymerization and the condensation polymerization are carried out in the same reactor, the technological process is short, the total molar ratio is easy to control, repeated transfer of materials is avoided, and influence of residues in the system on the molar ratio and influence of deterioration of deposited materials at dead corners of a conveying system on the reaction are avoided.

The invention relates to a control device for a steering wheel of an unmanned vehicle. The control device comprises a driver and a driver supporting arm, wherein the driver comprises a steering wheel toggle clip, a base supporting frame, a reduction gearbox and a motor; the steering wheel toggle clip is fixed on the steering wheel of the unmanned vehicle; the base supporting frame is fixedly connected with the steering wheel toggle clip; the motor is connected with the base supporting frame through the reduction gearbox; the driver supporting arm comprises a vacuum chuck, a universal joint direction adjuster, a supporting extending arm and a connecting bracket; the vacuum chuck is arranged on a front windshield; the connecting bracket is arranged on the reduction gearbox; the universal joint direction adjuster and the supporting extending arm are connected between the vacuum chuck and the connecting bracket in turn; the reduction gearbox and the motor are supported and fixed by the driver supporting arm; the base supporting frame is driven to rotate by the motor through the reduction gearbox; the steering wheel is driven to rotate by the base supporting frame through the steering wheel toggle clip. Compared with the prior art, the control device provided by the invention has the advantages of no damage to a vehicle body, convenience in mounting, safety, reliability and the like.

The invention relates to a non-vehicle-mounted charging and discharging control system and method based on the Hamiltonian control principle. The non-vehicle-mounted charging and discharging control system and method are applied to a non-vehicle-mounted charging and discharging machine to achieve friendly and stable charging and discharging control over an electric vehicle. The non-vehicle-mountedcharging and discharging machine adopts a bidirectional DC/DC and DC/AC two-stage main circuit topology. A virtual synchronous machine control method based on the Hamiltonian principle is introducedinto a bidirectional DC/AC interface, and passive control over charging and discharging is achieved through active adjustment control, rotor motion control, flux linkage control, virtual impedance control and voltage and current loop control. According to the invention, the Hamiltonian control method is combined with the virtual synchronous machine technology, a novel control system with passivityand inertia friendliness is provided for off-board charging and discharging, the energy attribute of the electric automobile can be brought into full play, the bidirectional friendly interaction capacity of the electric automobile and a power grid is improved, and stable and reliable interface guarantee can be provided for the electric automobile to participate in power grid frequency and voltageadjustment.

The present invention provides a heterojunction bipolar transistor that combines stable control of its fabrication and a low collector-voltage dependence of base-collector capacitance. An HBT includesa semiconductor substrate having first and second principal surfaces opposite each other; and a collector layer, a base layer, and an emitter layer stacked in this order on the first principal surface side of the semiconductor substrate. The collector layer includes a first semiconductor layer with metal particles dispersed therein, the metal particles each formed by a plurality of metal atoms bonded with each other.

The invention provides a power supply device, apparatus and control method. The power supply device is provided with: a power supply which is mounted to an apparatus; a switch which is operated when the apparatus is started and stopped; a conversion module which is provided with a plurality of conversion units capable of performing voltage conversion on power supplied by the power supply, and in which the plurality of conversion units are electrically connected in parallel; a selection unit for selecting, for each operation number, i.e. the number of conversion units which are to perform voltage conversion, one pattern from among a plurality of patterns indicating combinations of the conversion units which are to perform voltage conversion; and a control unit for controlling the conversionmodule such that the conversion units indicated by the pattern selected by the selection unit perform voltage conversion. The selection unit changes the selected pattern when the switch is operated.In the plurality of patterns, the combinations of conversion units which are to perform voltage conversion differ from each other in at least one operation number.

The invention discloses a rotation control method and device of a coarse pointing device for space optical communication. The method comprises the following steps: S1, acquiring a path curve of the coarse pointing device rotating from a current position angle to a target position angle; S2, discretizing the path curve by taking the control period as a sampling period, and decomposing the data to obtain a target angle corresponding to each control period; and S3, controlling the coarse pointing device to rotate towards the target position angle until the actual position angle of the coarse pointing device is equal to the target position angle, and controlling the coarse pointing device to rotate to the target angle corresponding to the control period in each control period in the rotating process. According to the invention, the coarse pointing device stably rotates to the target position angle along with the planned path curve, the angular velocity and the angular acceleration are restrained, shaking and power fluctuation generated when the laser communication coarse pointing device works can be greatly reduced, the control stability of the whole satellite is guaranteed, the impacton a power source is reduced, and the power consumption of the satellite is reduced.

The invention discloses a column type gas tank device for an edge sealing process. The column type gas tank device comprises an edge sealing machine body, wherein a first unit is arranged on one side in the edge sealing machine body, a second unit is arranged at the position, in the edge sealing machine body on the side of the first unit, a third unit is arranged at the position, in the edge sealing machine body on the side, far away from the first unit, of the second unit, the third unit is internally provided with a front air inlet and outlet column type gas tank, and the second unit is internally provided with two sets of side air inlet and outlet stand column type gas tanks. By using the column type gas tank device disclosed by the invention, operation of the first unit, the second unit and the third unit is effectively ensured, one machine with a plurality of gas storage tanks is further achieved, air can be well supplied in sections, the pressure and a flow of a gas source are ensured, a distance between the gas source and a unit mechanism is shortened at the same time, the reliability and the control stability of the units are ensured, and moreover, the sufficient gas demand quantity of the first unit, the second unit and the third unit is ensured.

The invention discloses a multi-body coupling attitude control method and system based on zero-force control. The method comprises the following steps: acquiring disturbance torque generated between a satellite platform and a rotating mechanism due to movement of the rotating mechanism; and calculating a compensation torque according to the disturbance torque and an expected zero torque, and controlling a corresponding rotating mechanism to act according to the compensation torque so as to counteract the influence of the movement of the rotating mechanism on satellite platform control. The rotating mechanism between the satellite platform and the effective load is used as an intermediate medium, and the satellite platform is compensated by controlling the rotating mechanism to act according to the compensation torque, so that the influence of load rotation on satellite platform control is reduced, the attitude control precision and stability of the satellite platform are improved, and the reliability of the satellite platform is improved. Decoupling of satellite platform control and load rotation is achieved, and the requirement for satellite platform control when different space pointing directions of multiple loads are provided at the same time can be met.

The invention discloses a building small crane and an achieving method thereof. The building small crane comprises a crane body. A traction box, a supporting column, stability maintaining columns, a winding and unwinding barrel, an extension rod and a controller are arranged on the crane body. The center position of the bottom end of the traction box is fixedly connected with the top end of the supporting column. The winding and unwinding barrel and the controller are arranged in the traction box. The front end of the extension rod is rotationally connected with the top end of the supporting column. The extension rod is provided with a support rod. The support rod and the extension rod can rotate. A hard rubber pad is arranged at the bottom end of the support rod. The controller is electrically connected with a touch screen. The touch screen is embedded in the front surface position of the traction box. When the building small crane is actually applied, hoisting is stable, the structure is firm, winding and unwinding strength is high, and the pull force is large; the effects that the hoisting length in the horizontal direction can be adjusted, the hoisting power is large, noise islow, and stability is high are achieved; and the whole device is installed and transported conveniently and rapidly, and the building small crane and the achieving method thereof are suitable for application and popularization.

The invention discloses a car running mode emission testing accelerator control device. The car running mode emission testing accelerator control device comprises an accelerator adjusting lead screw and an accelerator adjusting nut which are in screw-thread fit. The car running mode emission testing accelerator control device is characterized by further comprising a horizontally-arranged base plate and a base plate fixing device for fixing the base plate, the accelerator adjusting nut is arranged above one end of the base plate in an inclined fixing and supporting mode, a long-strip-shaped accelerator pressing plate is arranged below the accelerator adjusting nut, the lower end of the accelerator pressing plate is arranged on the upper surface of the base plate in a rotatable mode, the upper end of the accelerator pressing plate wholly extends out of the base plate in a forwards-inclined mode so as to form a force application end used for being in contact with an accelerator pedal, and the lower end of the accelerator adjusting lead screw is arranged in the mode of facing the upper surface of the accelerator pressing plate so that the accelerator pressing plate can be tightly pressed through the accelerator adjusting lead screw. By means of the car running mode emission testing accelerator control device, manpower can be replaced so as to achieve the accelerator pedaling motion, the accelerator control stability is guaranteed, the testing accuracy is improved, and the integrity of a tested vehicle can be guaranteed. The car running mode emission testing accelerator control device has the advantages of being simple in structure, convenient, rapid, stable and reliable to operate and the like.