42 results about "Closed loop" patented technology

The invention relates to an uncalibration machine vision-based intelligent navigation control system and an uncalibration machine vision-based intelligent navigation control method, and belongs to the technical field of automation and detection. In order to overcome the disadvantage that whether a technical effect is good or bad depends on uncalibration parameters in a conventional scheme, in vision system-based mobile robot real-time obstacle avoidance and a navigation control method in the technical scheme of the invention, an image is automatically acquired and analyzed for the purpose of realizing the control of a mobile robot platform; the image is processed rapidly from image feedback information obtained directly by utilizing the principal of machine vision; and feedback information is given in a time as short as possible for participating in the generation of a control decision so as to form the position closed-loop control of an end effector of the mobile robot. The scheme improves the adaptability and the work efficiency of a robot, effectively maintains the speed and the precision in an image processing process, enhances the robustness and the stability of a robot control system, and reduces cost input and energy consumption in an implementation process of the technical scheme.

The invention discloses a non-road diesel engine combustor DPF regeneration temperature control method. According to the method, control over the regeneration temperature of a non-road diesel engine combustor DPF is completed by combining feedforward control and PID feedback control. The method has the advantages that closed-loop control is stable and feedforward control is fast. The control precision of the regeneration temperature of a DPF catalytic converter is improved. Under various diesel engine working conditions, the error of the actual temperature of an inlet of the DPF catalytic converter and the DPF target regeneration temperature can be controlled within 25 DEG C. Accordingly, a DPF system can conduct reliable regeneration temperature management under various working conditions.

An apparatus for securing together first and second bone segments having peripheral surfaces comprising one or more bends. In some implementations the fixation device includes an elongate flexible strap having a proximal end and a distal end, the elongate flexible strap having a plurality of ratchet teeth disposed along an elongate distal portion thereof that function with a ratchet member within a locking head situated at the proximal end to permit the formation of a closed loop about the bone fragments. In some implementations the elongate flexible strap has a first elongate portion situated between the locking head and the elongate distal portion, the first elongate portion of the elongate flexible strap being more flexible than the elongate distal portion of the elongate flexible strap, the first elongate portion configured to extend across at least one of the one or more bends when the apparatus is in a secured state.

The invention relates to a self-adaptive optical image high resolution restoration method combined with frame selection and blind deconvolution, comprising the following steps: firstly, a short exposure image sequence gn (x, y) is recorded when a self-adaptive optical closed loop is corrected; shannnon entropy of each frame of image in the sequence is calculated; a degraded image gm (x, y) with lower entropy is selected for blind deconvolution image restoration; secondly, an initial value hm (x, y) of a point spread function is generated by utilization of random phase; thirdly, a target f(x, y) is estimated by using the gm(x, y) and the obtained hm (x, y), and an estimated value f(x, y) is obtained after addition of positivity limitation on the target; fourthly, an estimated value hm (x, y) of the point spread function is obtained by using the gm (x, y) and the f(x, y), and an estimated value h(x, y) is obtained after addition of positivity limitation in the same way; fifthly, inspection is made whether an iterated value h(x, y) and an iterated value f(x, y) meet iteration stopping requirements or not; if the iterated values do not meet the iteration stopping requirements, the third step is returned; if the iterated values meet the iteration stopping requirements, circulation is stopped and the f(x, y) and the h(x, y) are outputted. The invention has the advantages of effective improvement of restoration quality, acceleration of convergence rate, capability of well compensating correction capability under hardware limitation of a self-adaptive optical system, and improvement of imaging quality.

The invention discloses an automatic control system for variable seeding and fertilization and a multifunctional planter. The multifunctional planter comprises a power system, a rack, a rotary-plowing and ditching system, a sowing system and a fertilizing system. The control system comprises ground wheels, a rotary code disc, a servo motor, a server and a single-chip microcomputer. A program of a function formula f (Q) = (n, v) of the sowing quantity (Q) of the planter versus the rotation speed n of the seeding axle and the forward speed v of the planter is written into the single-chip microcomputer. The ground wheels rows in drainage ditches so as to advance synchronously with the whole machine; the forward speed v of the ground wheels is measured in real time by using the rotary code disc; a pulse signal is sent to the single-chip microcomputer; the single-chip microcomputer calculates the rotation speed of the seeding axle according to the sowing quantity and the forward speed of the planter, and transmits a signal to the server; the server controls the output rotation speed of the direct-current servo motor by transmitting a pulse signal; and the servo motor directly drives rotation of the seeding axle. According to the invention, the overall structure is reasonable. The whole system forms a closed-loop control system and can meet the requirements of accurate and variable seeding and fertilization.

The invention relates to a power transmission system and application thereof, in particular to a gas-liquid kinetic energy driven system and an oil pumping unit applying the same. The power driven system comprises a gas-liquid accumulator, an execution plunger cylinder, a plurality of reversing valves and a pressure pump, which form a driving oil way and an oil return way, and a closed loop consists of the driving oil way and the oil return way. The oil pumping unit adopts the driven system to drive an oil pumping rod to vertically move and can be folded. The power driven system saves energy resources and has high efficiency and good effects of low carbon and emission reduction, and the oil pumping unit has a simple structure, a small size, less easily-damaged mechanical parts and long service life. By the power driven system and the oil pumping unit, the technical problems that the power system in the prior art requires large motive power and has poor energy-saving effect, and the oil pumping unit is easily fatigue and damaged and has multiple faults are solved.

The invention relates to a control system and a control method for the rotating speed of a motor spindle of a numerical control system. The control system comprises an embedded Linux numerical control system master station and a numerical control system slave station which are in communication connection through an Ethernet control automation technology (EtherCAT) communication protocol bus, wherein the embedded Linux numerical control system master station periodically sends a speed command value to a servo device of the numerical control system slave station through a soft circuit layer to control the motor to rotate according to the speed command value; and the servo device of the numerical control system slave station periodically feeds a speed feedback value back to the embedded Linux numerical control system master station, so that a full closed loop control system is formed. A closed loop control method is adopted, the system and the method are basically free from interference, high in stability and transmission speed and low in failure rate, the circulation time of full closed loop control reaches 1mu s, control accuracy can reach 1nm, the rotating speed of the motor spindle reaches 16,000rpm, and stability and reliability are ensured.

The invention relates to the technical field of testing and discloses a bidirectional charge-discharge motor controller testing system and method. The bidirectional charge-discharge motor controller testing system comprises a testing host computer, a simulator, and a bidirectional charge-discharge motor controller. The testing host computer is connected with the simulator and is used for transferring simulating models to the simulator, wherein the simulating models include a power grid model, a bidirectional charge-discharge motor model, and a battery module. The simulator is in communication connection with the bidirectional charge-discharge motor controller. The bidirectional charge-discharge motor controller, the power grid model, the bidirectional charge-discharge motor model, and the battery model form a closed-loop operation testing circuit. The simulator is used for acquiring the operation data of the bidirectional charge-discharge motor controller, sending the acquired operation data to the testing host computer, and sending simulating signals to the bidirectional charge-discharge motor controller. The invention further provides a bidirectional charge-discharge motor controller testing method. The bidirectional charge-discharge motor controller testing system and method may easily test the bidirectional charge-discharge motor controller, increase testing efficiency, and reduce testing cost.

The invention discloses an intelligent precision boom sprayer and control method. The intelligent precision boom sprayer is suspended on a tractor and comprises a liquid supplying device, a boom device, a nozzle, a boom position adjusting device, a detecting device and a controller. The liquid supplying device comprises a solution tank and a solution pump, the solution tank is arranged on a frame, the inlet of the solution pump is connected to the solution tank, and the outlet of the solution pump is connected to the nozzle. The nozzle is arranged on the boom device which is connected to the boom position adjusting device. The detecting device connected to the liquid supplying device is used for adjusting solution spraying operation parameters. The controller is used for receiving signals sent by the detecting device and sending control signals to adjust the solution spraying operation parameters, and is connected to the detecting device to realize closed loop control.

The invention discloses a wind turbine aerodynamic-designing method considering static and dynamic influence of designed tip speed ratio on a wind wheel. The method uses a wind turbine closed loop performance index-average wind energy capture efficiency as a target function, the originally designed tip speed ratio, chord length and torsional angle separation optimizing process is improved into united optimization, so that wind-turbine aerodynamic design originally ignoring Maximum Power Point Tracking (MPPT) control dynamic can consider the shortcomings of tracking performance, and accordingly the static aerodynamic performance and tracking dynamic process of a wind turbine are coordinated. The method can effectively improve the wind energy capture efficiency of a variable-speed fan at turbulent-flow wind speed.

A moisture removal system having a crop drying enclosure for holding a crop product to be dried. A closed loop air circulation system is provided which includes a moisture removal enclosure for removing moisture from circulating air along with air ducting operatively connecting the moisture removal enclosure to the crop drying enclosure air inlet to form a closed loop moisture removal air system. A heat pump system, including a compressor, a first heat exchanger capable of operation as a condenser, along with two additional heat exchangers, each capable of operating as either a condenser or evaporator are positioned within the moisture removal enclosure, to remove excess moisture from the circulating air without the addition or extraction of heat from the ambient air temperature.

The invention discloses a visual dictionary close-loop detection method and device based on distance measure. The visual dictionary close-loop detection method based on distance measure comprises thefollowing steps: determining the shortest spatial distance between a first position corresponding to a current frame picture and a second position corresponding to a historical frame picture, whereinthe historical frame picture is a frame picture of which the similarity to the current frame picture reaches a first preset threshold; if the shortest spatial distance is less than a second preset threshold, putting the historical frame picture in a candidate frame picture set, wherein the second preset threshold is a pre-acquired preset multiple of the uncertainty of the current frame and an adjacent frame thereof; and carrying out close-loop detection on the candidate frame pictures and the current frame picture. The selection range of similar pictures in a visual dictionary is restricted bythe shortest spatial distance, so that appropriate similar pictures can be found for closed-loop detection. Therefore, visual ambiguity is reduced, the accuracy of closed-loop detection is improved,and the positioning accuracy of robots is increased.

The invention provides a calibration device of an electric current transducer, and relates to the field of sensor calibration. A temperature box of the embodiment of the invention provides a preset temperature environment, the transducer sensitivity coefficient under the temperature environment is calibrated by a controller under the temperature environment according to a practical current value in a closed loop circuit and a first current value acquired by a battery management system, accordingly different temperature environments can be provided through the temperature box, the transducer sensitivity coefficient under different temperature environments and different voltage values can be obtained, and accordingly the current acquisition precision of the battery management system can be improved through the transducer sensitivity coefficient.

The invention relates to a metering abnormality analyzing and processing system based on collection information of an electric energy meter. The metering abnormality analyzing and processing system ischaracterized by comprising a data management module, an establishment metering abnormality analysis model, a metering abnormality work order generation management module, and a field mobile operation processing module. The metering abnormality analyzing and processing system provided by the invention realizes the online closed-loop management of all processes of automatic diagnosis, work order generation and work order processing of metering abnormality, realizes the precise analysis of the causes of metering abnormality, reduces invalid work orders and onsite inspection times, and saves a lot of manpower and material costs; and the online whole-process processing manner improves the refinement level of the management, innovates the working mode, and effectively regulates the working processes and quality management and control.

The subject matter of the disclosed invention relates to systems a methods for applying a sensor to linear motor systems. In various embodiments, the disclosed method relates to providing closed loop control on a mover with or without a payload by detecting parameters of the mover, payload, or both.

The invention discloses an inverter air conditioner, which includes the structural parts of the external unit of the air conditioner, and also includes a heat dissipation module, an electric control board, an electrical box, PETG tube one, PETG tube two, a needle valve, and a fan. Leaf, condenser module, partition, PETG tube 3. Power pump, motor bracket, heat dissipation module, condenser module and power pump form a closed-loop circulation system. The internal cooling liquid absorbs heat and is driven by the power pump to flow down to the condenser module. The high-temperature cooling liquid dissipates its own heat through the rotation of the fan, and the cooled and heated liquid becomes the condensation end, so that the heat absorbed by the heat dissipation module can be conducted in time Go out and achieve the purpose of cooling down. Compared with the prior art, the invention is not partly controlled by the refrigeration system, is an independent closed-loop circulation system, has low cost and is easy to produce and process.

The invention discloses a method for automatically stabilizing an arc stream of an ion source. An ion source device comprises a filament (2) of a cathode (1), an arc chamber (3), an arc-voltage power supply (4), a filament power supply (5) and a bias power supply (6). The method for automatically stabilizing the arc stream comprises the following steps of: detecting a load current of the arc voltage power supply (4), namely the change of an arc stream; utilizing a PID (Proportional Integral Derivative) controller to control a load current, namely a filament current, capable of influencing the filament power supply (5) which emits electrons from a cathode, so as to achieve the aim of stabilizing the arc stream. According to the invention, a closed loop control is formed between the filament power supply (5) and the arc-voltage power supply (4), so that the arc stream can be automatically stabilized and artificial intervenes or main control computer intervenes are not needed.

The invention provides a brushless direct current motor control apparatus based on single-closed-loop control. The control apparatus comprises a controller (1), a tachometer (2), a phase commutation apparatus (3), a first position sensor (4), a second position sensor (5), a speed controller (6), and a PWM controller (7), wherein the first position sensor (4) is a corner position sensor; the second position sensor (5) is a magnetic pole position sensor; the first position sensor (4) and the second position sensor (5) are connected with the brushless direct current motor (9) separately; the controller (1) is connected with the tachometer (2), the phase commutation apparatus (3) and the PWM controller (7); and the PWM controller (7) is also connected with the speed controller (6). The brushless direct current motor system based on the single-closed-loop control, by adopting speed negative feedback and a regulator, can ensure a stable condition and realize the rotary speed in a non-static-error manner.