51results about How to "Convenient closed-loop control" patented technology

The invention discloses a method for controlling the speed regulation of the isothermal extrusion of industrial aluminum profiles for transportation, wherein a control system host machine, an isothermal extrusion PLC (Programmable Logic Controller) and an industrial aluminum profile outlet temperature thermodetector are used. The isothermal extrusion curves of the industrial aluminum profiles and profile outlet temperature control information are saved in the control system host machine. The method comprises the steps of: continuously monitoring and acquiring extruded profile outlet temperature by the thermodetector, importing temperature data into the isothermal extrusion PLC, issuing an extrusion speed regulation instruction by the isothermal extrusion PLC and a control system according to the detected temperature, transmitting the extrusion speed regulation instruction to an extruder PLC through the isothermal extrusion PLC, and regulating the increment/decrement of the extrusion speed of an extruder; and meanwhile, feeding back the real-time extrusion speed of the extruder to the isothermal extrusion PLC by the extruder PLC, and carrying out the processes in cycle. The method disclosed by the invention obviously improves the automation degree and production and manufacture efficiency of the extrusion production procedure of the industrial aluminum profiles and solves the technical problems of huge quality fluctuation and low production efficiency caused by controlling on the basis of manual experience for a long time.

The invention discloses a method for observing the speed of a permanent magnet motor, and relates to the field of speed observation and speed control for motors. The method comprises the steps of combining the rotor position acquired by an absolute type encoder with three parts of a designed kalman observer, observing the rotating speed of a rotor and a load torque of the motor, and using the observed rotating speed as feedback signals of a rotating speed ring of a permanent magnet synchronous motor control system; regarding the suddenly changed load torque of a permanent magnet synchronous motor as a system disturbance variable, using the motor load torque observed by the constructed kalman observer as feed-forward signals of a current loop, and constructing a feed-forward control system; acquiring the switching sequence of an inverter through a current controller and a space vector pulse width modulation method, then acquiring three-phase voltage inputting into the permanent magnet synchronous motor, and finally enabling the permanent magnet motor to rotate by a certain rotating speed. The method disclosed by the invention adopts the load torque acquired by the adaptive kalman observer, thereby being capable of timely reflecting load variation conditions of the system, carrying out feed-forward control on the estimated load torque, and being capable of improving an accurate tracking ability for the rotating speed.

The invention discloses a humanoid type mechanical finger with perceptive functions of temperature and touch force. The humanoid mechanical finger is formed by hinge of three sections of finger metal phalanges which have controllable bending ranges in sequence, and complexion silica gel is utilized to encapsulate the external surface of the humanoid mechanical finger; each section of the finger is hollow, the third section of the finger metal phalanges is internally provided with a micro motor and a minitype circuit, both the first section of the finger metal phalanges and the finger pulp of the second section of the finger metal are provided with plane grooves on the surface and are internally provided with three-dimensional force sensors, the semicircular face of the top end of the first section of the finger metal phalanges is provided with a gap, an cambered heat conductor and a temperature sensor are fixed through snap joints, and the temperature sensor is closely attached to the inner surface of the heat conductor. According to the humanoid type mechanical finger with perceptive functions of temperature and touch force, the temperature of an object touched by the mechanical finger and the three-dimensional force applied to the object can be sensitively measured and be timely transmitted to a control system, slipping, moving, deformation of the object and the like are recognized through the change of the three-dimensional force, the purpose of integrating the artificial touch to the mechanical finger is achieved, and convenience is brought to closed-loop control over the mechanical finger in grabbing the object more intelligently, cleverly and stably.

The fuel supply system includes mains pressurising and metering arrangement including a positive displacement ecology pump and an ecology valve piston chamber and a piston slidably movable in the chamber between de-prime and re-prime positions, the chamber forming a fuel sink to one side of the piston which increases in volume when the piston moves to de-prime position and reduces in volume when the piston moves to re-prime position. The ecology valve is fluidly connected to the ecology pump for pilot-only operation reverse direction operation of the ecology pump causes the piston to move to de-prime position removing mains fuel from injectors through a mains fuel distribution pipework and into the fuel sink, and for pilot and mains operation the forward direction operation of the ecology pump causes the piston to move to re-prime position refilling injectors with mains fuel from the fuel sink.

The invention discloses a small tidal volume ventilation control method of an anesthesia machine or a respirator. The method includes the steps of S10, entering a small tidal volume ventilation control mode, and by a control unit, controlling the inhalation valve of the anesthesia machine or the respirator to inhale; S20, controlling a sensor to detect a tidal volume value by the control unit, and feeding the value back to the control unit; S30, by a judging unit, judging whether the tidal volume value fed back is larger than a preset value VT0, and if so, executing the step S40, or else, executing the step S20; S40, by the judging unit, judging whether the inhalation valve reaches the minimum openness of not, and if not, executing the step S50, or else, executing the step S60; S50, by the control unit, controlling to reduce the openness of the inhalation valve, and then executing the step S20; S60, by the control unit, controlling and adjusting the openness of the inhalation valve to allow the inhalation valve to generate air overflow during inhalation, and then executing the step S20.

In installations for generating alternative energy it is necessary due to the fluctuating availability of the alternative energy source to provide electrical energy stores which can temporarily store excess energy or can compensate for energy bottlenecks. The present invention relates to such an electrical energy store having a bidirectional DC/DC converter with a low-voltage side and a high-voltage side which can be connected via the high-voltage side to a DC bus and which has a switching hysteresis with a charging and/or discharge curve, wherein power consumption and/or power output are/is dependent on a voltage on the high-voltage side.

The invention especially relates to an Internet-of-Things system for electric appliances of a building, which belongs to the technical field of building electricity consumption. The Internet-of-Things system comprises an electric appliance monitoring server, an electric appliance monitoring service platform, the Internet-of-Things, an electric appliance concentrator, an acquisition terminal and a control terminal. The system provided by the invention overcomes the problems of a low integration level and a low automation degree and has the advantages of flexible communication, reliable data, favorable closed-loop control, a high automation, flexible communication means and applicability to different electric appliance monitoring systems.

The invention belongs to the technical field of grinding machining equipment, and relates to an automatic grinding machine of a plunger ball head. The automatic grinding machine comprises a rack, a servo rotating table, an automatic clamping mechanism, a rotating mechanism, a grinding mechanism and two groups of limiting pieces, wherein the servo rotating table is installed on a working table board of the rack, the automatic clamping mechanism is installed on a rotating table of the servo rotating table, is used for clamping a workpiece and can horizontally move on the rotating table; the rotating mechanism is arranged on the automatic clamping mechanism, and is used for driving the clamped workpiece to rotate; the grinding mechanism is arranged on the rack, and can be used for adjusting feeding so as to grind the workpiece; the two groups of limiting pieces are arranged on the working table board of the rack and are arranged on the two sides of the automatic clamping mechanism. According to the automatic grinding machine of the plunger ball head, the production efficiency is high, the grinding machine of the ball head has an automatic clamping function, the automatic feeding and discharging can be conveniently realized at the later stage, and the labor intensity is reduced; the grinding machine of the ball head has an automatic feeding function, the feeding precision is high,and the production stability is good; and the grinding machine of the ball head is provided with a high-precision displacement sensor, so that the closed-loop control of the equipment is facilitated,and the stability of the feeding amount of each time is ensured.

The invention discloses a normal-temperature high-frequency cavity inlet power measuring device and method. The device comprises a power source, a circulator, a directional coupler, a power coupler and a high-frequency cavity which are connected in sequence. The power source and the circulator as well as the directional coupler and the power coupler are connected in sequence through waveguide transmission lines. The circulator is provided with an absorption load, the high-frequency cavity is provided with a coupling ring, and the directional coupler is provided with a reflection measuring power meter and a forward measuring power meter. The method comprises the following steps: calculating an inlet reflection coefficient of the high-frequency cavity by measuring a field amplitude signal, aphase angle signal and a coupling degree of the high-frequency cavity; measuring the reflection power and the forward power of the directional coupler, and calculating the power attenuation coefficient from the directional coupler to the inlet of the high-frequency cavity by utilizing the amplitude value of the reflection coefficient of the inlet; and finally, calculating the forward power, the reflection power and the actual cavity inlet power at the inlet of the high-frequency cavity by utilizing the power attenuation coefficient. According to the invention, the cavity inlet power of the high-frequency cavity can be accurately measured under high power.

The invention discloses a permanent magnet synchronous motor drive power board circuit and a design method thereof; the power board circuit comprises a rectifying and filtering module, an IPM power circuit module, an IPM drive circuit module, a bus voltage acquisition circuit module, a motor phase current acquisition circuit module, a power supply circuit module, a protection circuit module and asignal transmission interface circuit, wherein the input alternating current is under the action of the rectifying and filtering module, a direct-current bus voltage is obtained to be used as direct-current input of the IPM power module, and an inverter direct-current power supply is provided; a turn-on and turn-off signal of an IGBT tube of the IPM power module is input by an IPM driving circuit;the power supply circuit provides a required power supply for a power board chip and the IPM power module; the bus voltage acquisition circuit and the motor phase current acquisition circuit transmitthe collected signals to a control chip; when the control chip detects that the circuit is abnormal, a protection circuit is controlled and started to work and turn off the IPM driving circuit; and the signal transmission interface circuit is in information interaction with the motor controller.

The invention discloses a nonlinear compensation amplifier for magnetic powder brake-clutches, which comprises a preamplifier, a logarithm converter and a power amplifier, wherein the output end of the preamplifier is connected with the input end of the logarithm converter; the output end of the logarithm converter is connected with the input end of the power amplifier; and the output end of the power amplifier is connected with the winding of the magnetic powder brake-clutch. The amplifier carries out pre-transformation by introducing the logarithm conversion, so that the given input quantity and the controlled output quantity are linearized, namely the input signal X and the output torque T form a linear relationship. By using the amplifier, the open-loop control precision is enhanced, the closed-loop control is simplified and the closed-loop control stability is improved.

The invention discloses an obtaining method of optical remote sensing satellite image in-scene relative distortion indexes. Firstly error sources of remote sensing image in-scene relative distortion indexes are defined; image in-scene relative distortion is mainly affected by the random error of a satellite measurement system, a satellite imagery timer random error, satellite platform flutter and the satellite in-rail calibration accuracy; secondly, the optical remote sensing image relative in-scene distortion caused by each error source is obtained by calculating the image in-scene relative distortion value caused by each independent error source in the directions of along and crossing a track; finally the comprehensive influence on the optical remote sensing image relative in-scene distortion by each error source is obtained by adopting the optical remote sensing image relative in-scene distortion value caused by each error source, and the image in-scene relative distortion is estimated. The method indicates all factors influencing the image in-scene relative distortion, and gives out a quantitative calculation method of each independent influence factor and a method for estimating the image in-scene relative distortion.

A VPSA (Vacuum Pressure Swing Adsorption) oxygen generation module based on intelligent pressure control comprises a first adsorption tower, a second adsorption tower, a vacuum pump and an oxygen storage tank, wherein the air inlet and exhaust ends of the first adsorption tower and second adsorption tower are communicated with an air inlet of an oxygen generator respectively through a first control valve and a third control valve and are simultaneously communicated with a nitrogen discharging hole of the oxygen generator respectively through a second control valve and a fourth control valve; the nitrogen discharging hole is connected with the vacuum pump; the oxygen outlet ends of the first adsorption tower and second adsorption tower are communicated with the oxygen storage tank respectively through a fifth control valve and a sixth control valve; the oxygen storage tank is connected with an oxygen outlet of the oxygen generator; a seventh control valve is arranged between a connecting pipeline of the first adsorption tower and the fifth control valve and a connecting pipeline of the second adsorption tower and the sixth control valve; and the VPSA oxygen generation module also comprises a first pressure difference sensor, a second pressure difference sensor, a third pressure difference sensor and a fourth pressure difference sensor. The invention further provides an oxygen generation method of the VPSA oxygen generation module. According to the VPSA oxygen generation module and the oxygen generation method, the oxygen generation efficiency of a small domestic medical oxygen generator is improved, and an applicable scene is more flexible.

The invention discloses a piezoelectric pan-tilt holder. The piezoelectric pan-tilt holder comprises a shell, a reed, a carrier, a frame, a piezoelectric mechanism, a circuit module and a base; the shell and the base are connected to form a hollow cavity; the reed, the carrier, the frame, the piezoelectric mechanism and the circuit module are arranged in the hollow cavity; the piezoelectric mechanism is arranged on the base and electrically connected with the circuit module; the reed is arranged between the base and the frame and enables the base and the frame to be movably connected; and the carrier is fixedly connected in the frame and used for installing a lens module. The driving of the pan-tilt holder is achieved through the piezoelectric mechanism. The pan-tilt holder has the advantages of high response speed, capability of providing large power output and low power consumption.

The invention discloses a control method for improving the low-speed performance of an electric forklift based on an improved M/T method. In an encoder speed detection link, the rotor speed of a motoris collected by adopting fixed time, that is, an M method is adopted to meet medium-high speed sampling precision, and a T method is used to collect the low-speed speed of the motor at proper time. Due to the adoption of the M/T method, the precision of the stator angle is improved. Especially under the conditions of low speed and large current, the waveform quality is improved due to a high stator angle, the speed control precision is improved without using too high bandwidth, and the problem of jittering during starting or low-speed operation is relieved.

The invention discloses a high-reliability electric bolt releasing structure and method based on position detection, and relates to the technical field of conventional weapons. The high-reliability electric bolt releasing structure comprises a bolt releasing structure shell and a motor arranged in the bolt releasing structure shell; the motor is connected with a ball screw through a speed reducer,a bolt releasing sliding block is in threaded connection with the ball screw, and limiting sensors are arranged at the two ends of the ball screw; and the speed reducer is connected with a position detection device for detecting the moving position of the bolt releasing sliding block in real time, and the position detection device is fixedly arranged in the bolt releasing structure shell. The bolt releasing structure is simple and convenient to use; the real-time position of the bolt releasing sliding block is detected by the position detection device for detecting the moving position of thebolt releasing sliding block in real time, therefore, the motor can be controlled more accurately, and the problems of overshoot, high-speed impact and the like in the bolt releasing process are avoided under the condition that the bolt releasing time is guaranteed.

Provided is a method and a device for computer-assisted detection of building automation parameters, wherein a first building automation having first building automation parameters is determined for the building, which first building automation is based on one or more classes of respectively local parameters. The classes of local parameters include at least one first class of static building data of the building, a second class of current weather data for the location of the building, and a third class of prior building automation parameters of the building. The first building automation parameters are adapted depending on a number of classes of distant parameters of at least one predecessor building, which is situated at a location that is different from the location of the building. The number of classes of distant parameters at the location or for the location of the respective predecessor building is determined.