720results about How to "Guaranteed control accuracy" patented technology

The invention discloses an electric pressure cooker, which comprises a cooker body, a cooker cover and a driving mechanism, wherein the cooker body comprises an outer pot and an inner pot which is arranged in the outer pot, and the inner pot is used for accommodating cooked foods; the cooker cover is arranged on the cooker body and the cooker cover covers the inner pot in a sealing mode; an exhaust passage which communicates with the interior of the inner port and a pressure limiting valve which is in charge of controlling a ventilation state of the exhaust passage are arranged on the cooker cover; the driving mechanism comprises a power mechanism which is used for offering rotating motion of a rotating shaft and a threaded transmission mechanism which is used for converting rotation of the rotating shaft into vertical motion of the pressure limiting valve; and the threaded transmission mechanism comprises threaded pillars and threaded holes which are mutually matched. With the application of the technical scheme provided by the invention, a problem in the prior art that an electric pressure cooker, which cannot achieve continuous exhausting, is poor in cooking effect since foods cannot be kept turning continuously is solved.

This invention discloses a dual-feed AC-DC-AC converter control structure for wind power generation, and the rotor exciting magnetic converter using the fuzzy PI adaptive control strategy of current inner loop. When the generator no-load networking, the current inner loop uses the conventional PI regulator, and after networking, as to three modes, sub-synchronization, synchronization, super-synchronous, it uses fuzzy adaptive PI control. The network-side converter uses SPWM control strategy which fixed switching frequency and combining electric network electromotive front-feed. In the invention, both converting processes use four-quadrant operation PWM converters based on full-controlled devices, so it can not only improve the system dynamic response, reduce wastage and impact, achieve the two-way electric transmission, but also it can achieve wind power generation network side unit power factor sinusoidal current networking power generation operating.

The invention provides an intelligent sleep monitoring system for preventing kids from kicking quilts, comprising a control assembly, magnetic sensors, stretching motors, drive pulleys, pull ropes, a humidity-sensitive resistor, a thermal-sensitive resistor, magnets, temperature sensors, and a remote alarm assembly. The humidity-sensitive resistor and the thermal-sensitive resistor are arranged on the obverse side of a bed body. The magnetic sensors and the stretching motors are arranged in the corners of the bed body. The control assembly is connected to the humidity-sensitive resistor, the thermal-sensitive resistor, the magnetic sensors and the stretching motors. A quilt is connected to the stretching motors through the pull ropes. The temperature sensors are arranged on the quilt, and the temperature sensors are connected with the control assembly in a wireless communication mode. The control assembly is connected with the remote alarm assembly in a wireless communication mode. The intelligent sleep monitoring system of the invention has the functions of automatically covering a kid with a quilt, alarming for high fever and enuresis, and the like, and has a high level of intelligence. Long-term test shows that the intelligent sleep monitoring system can prevent kids from kicking quilts in sleep in a fully automatic way and improve the quality of sleep of both kids and parents.

The invention discloses a solar cell assembly frame and angle assembling device and a process thereof, and relates to a solar cell assembly device. The invention provides the solar cell assembly frame and angle assembling device with good comprehensive use performance, scientific and reasonable structure, simple process and high automation degree. The device comprises a rack; the center of the rack is provided with a lifting mechanism; the sides of the lifting mechanism are provided with locking and adjusting mechanisms respectively, fixed on the rack and connected with movable supports; the movable supports are provided with frame assembling cross beams for connecting an upper guide plate and a lower guide plate respectively, the lower guide plate fixes an angle assembling bottom plate of an angle assembling cylinder and is connected with the frame assembling cross beam, and the angle assembling bottom plate fixed on the inner round angle of the rack is provided with an angle assembling mechanism; the upper guide plate of the frame assembling cross beam is provided with a transmission mechanism consisting of a motor, a telescopic pipe and a driving wheel set, and the two corresponding sides of the transmission mechanism are provided with positioning guardrails; and the transmission mechanism is connected with a frame closing mechanism.

The invention provides a method and device for controlling the energy balance between bridge arms of a modularized multi-level converter and relates to the field of control over the energy balance between the bridge arms of modularized multi-level converters. The method and device for controlling the energy balance between the bridge arms of the modularized multi-level converter solve the problem that energy imbalance between the bridge arms of the modularized multi-level converter causes unstable operation of the modularized multi-level converter. According to the method for controlling the energy balance between the bridge arms of the modularized multi-level converter, an alternating-current component is added to a bridge arm circulation, so that a channel of energy exchange between the upper bridge arm and the lower bridge arm is formed, and on the premise that the alternating-current output voltage of the modularized multi-level converter is not influenced, energy balance of the upper bridge arm and the lower bridge arm is controlled through the control over the component of the alternating-current circulation. According to the device for controlling the energy balance between the bridge arms of the modularized multi-level converter, an inner-ring controller composed of a standard proportional resonance adjuster is adopted, and both the stability and the reliability of the modularized multi-level converter are improved by over 5% through the control over the energy imbalance of the upper bridge arm and the lower bridge arm. The method and device are suitable for controlling the energy balance between the bridge arms of the modularized multi-level converter.

A vertical shaft maglev wind power generator is composed of vanes, a rotary shaft, a power generator, a radial magnetic bearing, an axial TDOF magnetic bearing, an upper protection bearing, a lower protection bearing, an upper protection bearing retainer ring and a lower protection bearing retainer ring; the rotational part and the stationary part of the fan are not in mechanical contact, the mechanical friction in the fan is completely eliminated and the FDOF levitation of the fan rotor is realized. The axial magnetic bearing of the fan supplies gravity offset through 4 stator magnetic poles and the effect of a suction disc and performs axial translation and two radial rotational DOF control on the rotor; and the radial magnetic bearing finishes the two radial translation control of the fan rotor. The invention has reasonable layout of the components, completely eliminates the friction problem of the vertical shaft fan bearing, greatly reduces the starting wind speed of the wind power generator and improves the wind energy utilization rate.

The invention discloses a navigation robot obstacle detection method and system. The system mainly comprises an ultrasonic detection module, an ultrasonic scanning module, an infrared detection compensation module and a robot core control module, wherein the ultrasonic detection module is mainly realized by amplifying a 40 kHz high-voltage driving signal and an ultrasonic receiving signal. The module is erected on a scanning steering engine to realize front non-dead-angle 180-degree scanning detection. By combining infrared range finding, the compensation of a navigation robot ultrasonic blind region is realized. A driving circuit is realized by establishing an H bridge with a field effect transistor. In a navigation robot, planar multi-point sensing is realized by using a pair of ultrasonic probes; the range finding range can reach 5.9 m at farthest; and a detection blind region is reduced to 2 cm. The system has the characteristics of low cost, small detection blind region, high anti-diffraction capacity, high real-time property and the like and has broad industrialization prospect. The method and the system can be used for the fields of micro robot navigation, environmental detection, intelligent vehicle active safety and the like.

The invention relates to a road surface self-adaption anti-skid controlling system and a method for a distributed type driving electric automobile. The road surface self-adaption anti-skid controlling system comprises a motor controller, a motor torque distributor, an actual measurement sensor unit, a nonlinearity road surface estimating unit, an anti-skid controlling selective access unit and a driving anti-skid controlling unit, the nonlinearity road surface estimating unit is used for obtaining road surface peak value attachment coefficients of all wheels, the driving anti-skid controlling unit conducts anti-skid controlling and outputs control torque according to the road surface peak value attachment coefficients, of the wheels, obtained by the nonlinearity road surface estimating unit and actual measured data of the actual measurement sensor unit, the anti-skid controlling selective access unit conducts a logical judgment and then outputs control torque or distributed torque to the motor controller according to the control torque output by the driving anti-skid controlling unit, distributed torque of the motor torque distributor and the actual measured data of the actual measurement sensor unit, and the motor controller controls four driving motors to move. Compared with the prior art, the road surface self-adaption anti-skid controlling system and the method for the distributed type driving electric automobile have high control precision and a good anti-skid effect.

The invention relates to an intelligent valve positioner. A copper waterproof connector and a silencer are arranged outside a box body, while a transducing plate, a connecting plate, a cartridge valve and an insert block are arranged in the box body; a plug block is arranged below the connecting plate, and a main board is arranged above the connecting plate; a protection cover is arranged above the main board; a valve plate is arranged on one side of the cartridge valve and has a valve port; and a linear displacement sensor is arranged on a pneumatic actuating mechanism out of the box body and connected with the copper waterproof connector by a lead. The intelligent valve positioner has a simple structure, rational design, low energy consumption and high control precision, can conduct functions of valve position alarm, fault alarm and self-diagnosis, can be switched manually and automatically, has 'gas, power supply and signal interruption' protection functions, works stably in severe spot environments and has a wide application range.

The invention discloses an automatic thickness control system and method of a blown film. The automatic thickness control system of the blown film comprises a film thickness detection module, a film thickness control module, a film cooling and forming mold with a plurality of brushless direct-current motors as well as a control panel. According to the invention, an FPGA (field programmable gate array) control chip of a programmable logic device is utilized to achieve a fuzzy control algorithm so as to obtain the speed control quantity of the brushless direct-current motors; by combining a double-closed-ring control algorithm for the brushless direct-current motors a control signal output by the FPGA control chip is changed and adjusted correspondingly when the thickness of the film is changed; the thickness uniformity of the films at different circumferential parts can be controlled by acquiring horizontal thicknesses of the films at controlled subzones and the positions of air flue openings corresponding to the films via transmission and decoupling control, so that the control requirement on horizontal thickness uniformity of the films can be met; the automatic thickness control system and method of the blown film are high in integrity, small in volume, good in robust performance, stable and reliable in operation, high in expansibility, high in control precision, low in accumulative error, and high in adaptability.

The invention discloses an optimal control system for a steel rolling heating furnace, relating to the technical field of steel rolling of a heating furnace. Firstly, an on-line furnace temperature setting device is established according to different billet types, production rhythm, billet initial temperature and billet tapping temperature; the billet tapping temperature is controlled by controlling the temperature of the furnace; based on heat efficiency models under various working conditions, the loading variation of the heating furnace is calculated and taken as a feedforward value of the furnace temperature, and the high-accuracy control on the temperature of the heating furnace under loading fluctuation is realized; and on the basis, an optimal air-fuel ratio is found by establishment of an air-fuel ratio optimal control model, so that the heating furnace achieves an optimal burning condition and the aims of saving fuel and lowering steel loss are achieved.

The invention discloses a constant-pressure gas storage water pumping compressed gas energy storage system and an energy storage method. A high-pressure constant-pressure gas storage cabin, a water-gas jointly containing cabin and a water storage pool are arranged, stable sealing pressure is provided through the water-level difference of the high-position water storage pool and the low-position high-pressure constant-pressure gas storage cabin, the investment cost of the system is greatly reduced, the recovering age limit of the energy storage system is shortened, the operating economy of thesystem is improved, the energy loss in the throttling pressure stabilizing process is avoided, it is guaranteed that a compressor and an expansion machine run under the constant working condition, thesystem efficiency is improved, the water-gas jointly containing cabin and the water storage pool form a water pumping energy storage system, the high-pressure constant-pressure gas storage cabin anda water storage pool close to the ground form a water pumping energy storage system, that is the double water pumping energy storage systems are formed, in the energy storage process and the energy releasing process, flowing changing speeds of water in the water storage pool and water in the low-position high-pressure gas storage cabin are slow, the loss of the water in the flowing process is relatively small, and the efficiency of the water pumping energy storage system formed by the high-pressure constant-pressure gas storage cabin and the water storage pool close to the ground is improved.

The invention relates to hydrodynamic deep drawing equipment for forming deep cavity parts, which is capable of deep drawing the deep cavity parts with complicated shapes such as necking-type parts with negative draft angles. The equipment is formed by three parts, i.e. a host machine, a hydraulic control system and an automatic control system of a computer. The host machine is a hydraulic machine with three beams and four columns; the hydraulic control system provides motion power to the host machine and mainly comprises two main loops, i.e. a side pressing control loop and a charging chamber control loop; and the automatic control system of the computer is used for collecting data of a displacement sensor and a pressure sensor in real time, accurately controlling and recording formed parameters, and also accurately controlling pressure according to a set curve. The equipment provided by the invention can be used for forming the parts which cannot be formed by a traditional forming process or can be formed only by a plurality of processes; has the advantages of high forming accuracy, good surface quality of the parts, high die fitting degree and the like; and has the characteristics of simplicity and convenience in operation, high control accuracy, high universality, high automation degree and the like.

The invention discloses a rotary table of a desktop mechanical arm. The rotary table is provided with a base, a large arm driving motor, a small arm driving motor, a large arm speed reducing assemblyand a small arm speed reducing assembly, wherein the large arm driving motor and the small arm driving motor are located at the rear side of the base and arranged in an up-down stacking manner; the large arm speed reducing assembly and the small arm speed reducing assembly are located on the left outer side surface and the right outer side surface of the base separately; the large arm speed reducing assembly comprises a large arm first-level synchronous belt wheel and a large arm second-level synchronous belt wheel located between the large arm first-level synchronous belt wheel and the base;and the small arm speed reducing assembly comprises a small arm first-level synchronous belt wheel and a small arm second-level synchronous belt wheel located between the small arm first-level synchronous belt wheel and the base. According to the rotary table of the desktop mechanical arm, the safety is improved; for a speed reducing synchronous belt, arrangement for auxiliary assemblies is reduced, so that the manufacturing cost is reduced, and the speed reducing ratio can be increased and the speed reducing effect can be improved, so that the control precision is ensured; and moreover, the rotary table of the desktop mechanical arm is simple in structure, easy to detach and install, and convenient to maintain.

The invention discloses a device for closed-loop control of a permanent magnet synchronous motor, which comprises a current sampling recover module, a closed-loop feedback control module, a voltage coordinate inverse conversion module and a space vector pulse width modulation module. The optimized design of the whole control algorithm is realized by using the device for closed-loop control of a permanent magnet synchronous motor provided by the invention under the condition of ensuring motor control precision; moreover, a hardware circuit can be used for adjusting motor parameters and dead time according to a specific motor, thereby shortening the design period and flexibly applying the device for closed-loop control to various permanent magnet synchronous motors.

The invention discloses an underwater multipurpose robot propelled by bionic undulating fins. The underwater multipurpose robot comprises a head, a middle, a tail, a left bionic undulating fin propelling mechanism and a right bionic undulating fin propelling mechanism which are arranged in sequence. The bionic undulating fin propelling mechanisms on the left side and the right side with a cam swing arm driving structure as the core are adopted for driving the fin strips to drive the flexible fin faces to generate continuous undulating deformation, the fin strips act with water to generate advancing thrust, through cooperation with a sinking and floating adjusting mechanism in the middle, multi-dimensional movement such as straight moving, turning and floating and diving of the underwater robot can be achieved, and good maneuverability is achieved. Meanwhile, the sensing flow field speed data and the self orientation data can be obtained according to an ultrasonic Doppler current meterarranged at the head part and a USBL underwater acoustic positioning system; motion of the underwater robot is planned, the underwater robot is selected to operate on a channel with constant flow velocity and small flow resistance, the underwater robot has the capacity of sensing and reducing underwater surge interference in advance, and the underwater robot has good reliability and robustness.

The invention discloses a precise landing control method for an unmanned aerial vehicle. The method comprises the steps that 1, the unmanned aerial vehicle executes landing preparing; 2, the unmanned aerial vehicle starts hovering and shoots a base station through a camera; 3, an unmanned aerial vehicle control system conducts denoising processing and binarization processing on a shot image, a central point is determined by adopting a central method, when the central point is marked as a suspicious point, mode recognition is conducted on the suspicious point, and when mode matching is successful, an unmanned aerial vehicle flying control system controls the unmanned aerial vehicle to land; 4, in the landing process of the unmanned aerial vehicle, the flying control system controls the flying attitude of the unmanned aerial vehicle according to the offset; 5, the unmanned aerial vehicle precisely lands on the base station for landing. According to the method, an influence of interference factors on base station seeking is reduced by adopting denoising processing, binarization processing and mode recognition, and the control precision is high; in the landing process of the unmanned aerial vehicle, the flying attitude of the unmanned aerial vehicle is adjusted in real time, and it is guaranteed that the unmanned aerial vehicle precisely lands on the base station.

The invention provides a multi-shaft AC servo motor control device, which comprises a parallel bus communication module, a PWM cycle counter module, an encoder feedback signal processing module, an AD interface module, a first sequential control module, a position loop computation module, a first filter group, a second filter group, a speed loop computation module, a third filter group, a data conditioning module, a CLARK transformation module, a PARK transformation module, first and second current loop computation modules, a counter electromotive force compensation module, a cross decoupling compensation module, a bus voltage compensation module, an IPARK transformation module, an ICLARK transformation module, an SVPWM module, a second sequential control module, a PWM comparator module and a dead zone insertion module. When the multi-shaft AC servo motor control device is used, the control hysteresis of a position loop, a speed loop and a current loop can be eliminated, the real-time property is good and the control precision is high; and through the global PWM cycle counter, the complete synchronization between multiple motor shafts can be realized.

The invention relates to a model uncertain boundary-based planet landing trajectory tracking robust control method, in particular to a trajectory tracking robust control method in a planet landing process under the condition that a detector is disturbed by multiple sources, belonging to the technical field of deep space detection guidance and control. According to the method, in consideration of influences of a target celestial body gravitation model and outside interferences and other uncertain factors on trajectory tracking, the design concept of a model uncertain boundary is introduced; through designing a robust feedback control rule and ensuring the nonlinear characteristic of a control mechanism, a deviation between an actual tracking trajectory and a feedforward guidance design trajectory does not exceed an expected boundary, therefore, the landing trajectory tracking performance of the planet detector disturbed by multiple sources is optimized, the influences of the multi-source disturbance and system uncertainty on the landing flight trajectory of the detector can be effectively overcome, the control performance of the detector system is improved, and the landing flight trajectory control precision of the planet detector is ensured.

The invention discloses an intelligent setting method for the on-line target strip shape of a cold rolling strip. The intelligent setting method comprises the following steps that a strip shape curve is divided into an original strip shape detection curve, a technology error strip shape compensation curve and a target strip shape curve, wherein the original strip shape detection curve and the technology error strip shape compensation curve are overlaid to form an effective actually-measured strip shape curve which is called the effective strip shape curve for short, and the target strip shape curve only needs to consider a strip shape control target for the follow-up process requirement; an on-line strip shape target curve is built on the basis of a quartic Legendre polynomial, the self-balanced constraint condition requirement (that is, the transverse integration in the width direction of the strip is zero) of the residual stress deviation of the rolled strip in the width direction of the strip is met, the target is clear, and the function is explicit; and a target strip shape standard curve library is built on the basis of an intelligent algorithm, the optimal parameter of the on-line target strip shape is obtained, and the control precision of the strip shape is ensured.

The invention discloses a thyristor rectifier bridge parallel operation full digital current homogenizing control device, which comprises a regulator, a rectifier cabinet controller, thyristor rectifier bridges and a detection component. The regulator is a master controller; the rectifier cabinet controller is a slave controller; a terminal signal processing module regulates terminal voltage and current signals of a generator, so that the terminal voltage and current signals are suitable to be output to an analog-to-digital conversion module of a regulator controller; and a synchronization signal processing module regulates the anode voltage of the rectifier cabinet thyristor rectifier bridges, so the anode voltage is suitable to be output to a pulse formation module of the regulator controller to serve as a synchronization signal of the anode voltage of the thyristor rectifier bridges. Due to the adoption of digital closed loop control, full digital intelligent current homogenization for a plurality of parallel operation thyristor rectifier bridges under full-motion environment is realized by real-time sampling and control.