105 results about "Saturation phenomenon" patented technology

The invention discloses an anti-saturation PID (Proportion Integration Differentiation) control method for a motor speed regulation system. An integral predictor is added into a common PID controller; when an executor is saturated, the integral state predictor utilizes an error e of a control command value and a system output value, a differential value of the error and a limiter output value together to calculate a stable-state integral state value; and after the stable-state integral state value is processed by a low pass filter, integral items are reset. The method can be used for effectively inhibiting the integral saturation phenomenon, so that the controller can obtain smaller overshooting and shorter desaturation time in the case of saturation. The anti-saturation PID control method can be applied to the PID controllers of various motor speed regulation systems.

The present invention provides an inertial sensor capacitance detection accelerometer. The input end of a preamplifier is connected with the signal output of an inertial detection element; the input end of an instant floating point analog-to-digital converter is connected with the output signal of the preamplifier; the output digital signals of the instant floating point analog-to-digital converter are transmitted to a digital loop filter, and then a one-digit quantizer outputs digital stream; and the digital stream passes an electrostatic force feedback unit to realize the closed loop operation. The negative feedback is realized through adoption of a sampling technology, and the linearity and the dynamic precision of the closed loop system are improved. The digital loop filter is employed to realize the shaping of quantification noise to reach the purpose of low noise and digital quantity output. Through adoption of a digital mode, the loop filter is able to avoid the integration saturation phenomenon generated by the simulation of the loop filter and reduce the layout design difficulty and the influence of the noise of simulation of the loop filter on the system. Through adoption of the instant floating point analog-to-digital converter, the inertial sensor capacitance detection accelerometer performs quantification to effectively improve the system noise performance.

A spatial information detecting device is provided, which is capable of reducing the possibility that a saturation phenomenon is caused by the influence of an environmental light. This device includes a photoelectric converting portion for receiving a signal light from a target space to generate electric charges, a charge separating portion for separating electric charges corresponding to a constant amount of a bias component as undesired electric charges from the electric charges generated by the photoelectric converting portion, a charge accumulating portion for accumulating the remaining electric charges as effective electric charges reflecting a fluctuation component of the signal light, a barrier control electrode for forming a potential barrier between the charge separating portion and the charge accumulating portion, and a charge take-out portion for outputting the effective electric charges as an received-light output. By controlling a voltage applied to the barrier control electrode to change a height of the potential barrier, it is possible to adjust an amount of electric charges flowing from the charge separating portion into the charge accumulating portion over the potential barrier.

The invention discloses a linkage control method, a linkage control system and a linkage control device for the inlet air pressure and the capacity air volume of a coal mill. The method comprises the following steps: obtaining an input value of a capacity air door of the coal mill; comparing the input value of the capacity air door with upper and lower threshold values of a preset input value of the capacity air door; obtaining a hot air pressure and capacity air volume linkage triggering direction instruction; obtaining the dynamic value of an inlet air pressure setting value offset through combination with preset inlet air pressure setting offset target values and inlet air pressure setting value offset change rates; integrating a preset inlet air pressure setting value with the dynamic value of the inlet air pressure setting value offset to obtain inlet air pressure control quantity; controlling the inlet air pressure of the coal mill to enable the opening degree of the capacity air door of the coal mill to be adjusted in an adjustable linear region. According to combination with a coupling relationship between the inlet air pressure and the capacity air of the coal mill, the inlet primary air pressure and the capacity air volume linkage conditions of the coal mill are controlled and adjusted, the integral saturation phenomenon easily caused by a capacity air control loop can be inhibited, and the controllability and the adjustment quality of the full-load range of the capacity air door are effectively improved.

The invention provides a PID control method with the integral saturation and pretreatment functions. The PID control method analyzes the transient process of step response of a system and is provided according to an error between the set valve and the feedback quantity and a change rate of the controlled quantity; score accumulation values are treated differently according to the different conditions so that the integral saturation phenomenon can be thoroughly eliminated, and the good control effects of the steady-state characteristic and the dynamic characteristic of the system can be achieved; moreover, the good capacity of resisting disturbance is achieved.

The invention discloses an improved integral separation type PID control method, belonging to the field of the PID control. Because the upper limit value umax and the lower limit value umin of the theoretical output value are set, too large or small control amount can be avoided. Even if the integral saturation phenomenon occurs, the overshoot can exit quickly due to less integral accumulation, and hereby the response speed of the overshoot is increased and the overshoot is reduced. In addition, the increment delta P of the theoretical output value and the difference delta U of the theoretical output value and the set threshold value are calculated, and the increment delta P is compared with the difference delta U: the smaller one of the increment delta P and the difference delta U is compared with xi if the overshoot phenomenon is possible to occur, wherein, the integral coefficient ki is easy to be neglected at the moment and the occurrence of overshoot is prevented hereby, and the smaller one of the increment delta P and the difference delta U is compared with the xi if the static errors of the system are likely difficult to be eliminated, wherein the integral coefficient Ki is easy to be considered at the moment and the static errors of the system are easy to be eliminated hereby. The improved integral separation type PID control method can also realize the positive and negative adjustment, thus the adjustment precision of the system can be improved.

The invention relates to a low frequency strong magnetic field shield material, which is composed of a single layer or multiple layers high conductivity material and a ferromagnetism material. The shield material is combined by the high conductivity material and the ferromagnetism material according to different orders, layers and thicknesses. The ferromagnetism material is performed with heat processing during the process for preparing the shield material. Considering the easy generation of magnetic saturation phenomenon of high magnetic permeability ferromagnetism material under strong magnetic field environment, a highly resistance magnetic saturation material is selected to reduce the strong magnetic field, then the high magnetic permeability material is employed to shield attenuated magnetic field, The high conductivity material is employed as a magnetic barrier layer between the highly resistance magnetic saturation material and the high magnetic permeability material layer, and the low frequency strong magnetic field shield material can partially shield the alternating magnetic field. According to the invention, the thickness of the shield material is about 0.2mm, the shield efficiency of the low frequency strong magnetic field at 10 kHz-500 kHz can reach 40 dB, and a technical problem that how to increase the shield efficiency of the low frequency strong magnetic field under the condition that the shield material allowanced thickness is limited can be solved.

The invention provides a vehicle lateral stability control method considering tire cornering stiffness changes. The vehicle lateral stability control method considering the tire cornering stiffness changes mainly comprises the following steps that a current yaw rate and side slip angle expected by a driver are calculated according to a vehicle-mounted sensor detection system and a two-degree-of-freedom vehicle model; and in the running process of a vehicle, the tire cornering stiffness is changed continuously and has uncertainty. According to the vehicle lateral stability control method considering the tire cornering stiffness changes, the tire load transfer amount and the current side slip angle magnitude are utilized to fit a specific value of the tire cornering stiffness, and change parameters of the tire cornering stiffness are added to a vehicle control model; tire side slip angle constraint conditions are introduced, a model predictive control algorithm is adopted, and the situation is finally described as an optimization constraint problem, and the current optimal control sequence is solved; and finally, the output of the control quantity is realized through an actuator, anda control objective of avoiding the tire lateral force saturation phenomenon is realized under the condition of considering the tire cornering stiffness changes.

The invention provides a multi-rotor aircraft yaw anti-saturation control method and a multi-rotor aircraft, not only can improve aircraft yaw control performance, but also effectively inhibits a yawanti-saturation phenomenon, enhances robustness of aircrafts and further has properties of small quantity of control parameters, easy engineering adjustment and convenient engineering realization; theapplication scope is wide, the method does not depend on models, the method is suitable for most of saturated control systems having performers, and relatively strong practicality is realized; according to different system states, different corresponding control strategies are adopted, system anti-disturbance capability can be improved on the condition that the system is guaranteed to be stable,the saturation phenomenon is inhibited, and the actual application value is realized.

The invention discloses a load-sensitive control system, a control method and a hydraulic system, and relates to the field of engineering machinery. The load-sensitive control system, the control method and the hydraulic system are used for achieving self-adaptive matching of system pressure and load pressure. The load-sensitive control system comprises a variable pump, a load-feedback oil circuit and a differential pressure control valve; the differential pressure control valve is connected with the variable pump and the load-feedback oil circuit, and the differential pressure control valve can enable a difference value between pressure of an outlet of the variable pump and pressure of a load on the load-feedback oil circuit to be changeable. According to the technical scheme, the load-sensitive system with the differential pressure changeable is provided, the system can eliminate the flow saturation phenomenon occurring in the idle-speed operation process of an engine and improve the speed regulating characteristic of the load-sensitive system, and meanwhile the energy-saving property of the system is improved.

The invention relates to a three-phase integrated electronic transformer, comprising a main body and a signal converter box connected with the main body, wherein a three-phase measuring component is poured in the main body, the three-phase measuring component comprises a voltage sensor and a current sensor, and a signal conversion module is mounted in the signal converter box. The three-phase integrated electronic transformer provided by the invention adopts an integral structure, is integrated with the functions of measuring three-phase current, three-phase voltage, zero-sequence current and zero-sequence voltage, simple in structure, convenient to mount and is simple to maintain; signal output adopts a small-signal current ring mode and is strong in anti-jamming capability; and the voltage sensor and the current sensor respectively adopt a Rogowski coil and a capacitive voltage sensor, the hysteresis effect and saturation phenomenon of a traditional electromagnetic transformer are avoided, and the high-precision measurement demand can be met.

Embodiments relate to a nonvolatile memory device and a method for manufacturing the same. According to embodiments, a nonvolatile memory device may include a tunnel ONO film having an oxide film, a nitride film, and an oxide film stacked on and/or over a semiconductor substrate. It may also include a trap nitride film formed on and/or over the tunnel ONO film, a blocking oxide film formed on and/or over the trap nitride film and having a high-dielectric film with a higher dielectric constant than a dielectric constant of a SiO2 film. According to embodiments, a gate may be formed on and/or over the blocking oxide film. An electron back F/N tunneling at the time of an erase operation may be minimized. This may improve an erase speed and erase Vt saturation phenomenon.

A transporting apparatus includes a motor, a transporting mechanism which receives a power from the motor and transports the sheet, and a control section which controls the motor in accordance with a predetermined control sequence to make the transporting mechanism transport the sheet up to a target position, and detects an occurrence of an electric-current saturation phenomenon in the motor. When the control section detects the occurrence of the electric-current saturation phenomenon, the control section performs correction of the predetermined control sequence including correction in which a target transporting velocity of the sheet is lowered from a predetermined value determined in the predetermined control sequence, and controls the motor in accordance with the corrected control sequence to make the transporting mechanism transport the sheet so that the sheet is stopped at the target position.

The invention relates to a multiple epitaxial growth method for realizing a big length-to-diameter ratio ZnO nanowire array film based on a low-temperature hydrothermal method, which comprises the following steps: carrying out sputtering deposition on a ZnO nano seed crystal layer on a silicon substrate; taking the ZnO nano seed crystal layer as a guiding layer, realizing the growth of a ZnO nanowire vertical orientation array by utilizing the hydrothermal method and controlling the growth time within 3 hours; and cleaning the sample, carrying out secondary epitaxial growth on the ZnO nanowire array single growth sample by applying again the hydrothermal method and controlling the growth time within 3 hours. According to the invention, the wet epitaxial growth of the top end of a single ZnO nanowire along the (0001) direction is realized, the length-to-diameter ratio of the nanowire is greatly increased, and the appearance of the growth saturation phenomenon as the increase of growth time under the single growth condition of the ZnO nanowire is overcome.

This invention provides a perpendicular magnetic recording type disk drive comprised of a double-layered disk medium and a magnetic head containing a read head element containing a GMR element. The GMR element has a linear response dynamic range characteristic larger than an average value of a reproduction magnetic field from a disk 101 and a characteristic capable of avoiding or suppressing saturation phenomenon even if it is affected by a strong reproduction magnetic field from the disk medium.

The present invention relates to an image processing device and a method for processing an image. The image processing device includes a brightness improvement unit to improve a brightness of inputted images by increasing a brightness of a dark image more darker than a knee point among inputted images with reference to a predetermined knee point and decreasing a brightness of an image more brighter than the knee point; and a contrast improvement unit to improve a contrast of the image outputted from the brightness improvement unit. The image processing device and the method for processing the image can reduce a distortion phenomenon and a saturation phenomenon or the like by reflecting the characteristics of images during the brightness improvement and contrast improvement of the images.

The invention provides an anti-saturation internal model control system design method based on static-state feedforward compensation. The method is used for a process industrial control system. The method comprises a controller Q, a to-be-controlled object GP containing saturation elements, an internal model Gm of the to-be-controlled object and three static-state compensators K1, K2 and K3. By performing static feedforward analysis on the basis of original internal model control system, compensation is performed for controller input bias, controller output bias, which are caused by saturation phenomena, and controller output bias caused by slowing down of output of the object. By leading in 3 compensation loops in the original internal model control system output response of the object is improved. Compared with the prior art, according to the invention, controller and compensator design is performed based on transfer function of the object, so an engineer can know the method more easily. Meanwhile, the method, which improves the output response of the object via the static feedforward compensation idea, is different from the traditional anti-saturation internal model control idea, so the method is highly realizable in actual application.

The invention relates to a measuring device of oxide in a metal tube based on a bipolar magnetic probe and the measuring device is used to measure the stacking weight of oxide in an austenite stainless steel tube. The measuring device comprises a magnetic probe and a detecting instrument which are connected by a wire, wherein the magnetic probe is the bipolar magnetic probe and comprises a packaging shell and a U-shaped permanent magnet of which two poles are exposed out of the shell, a magnetic induction coil which is connected with the detecting instrument is wound on the U-shaped permanent magnet; and the detecting instrument is used to display read numbers by switching and adopting light-emitting diodes. The device adopts the bipolar magnetic probe and the magnetic induction coil to receive signals and is not easy to influence by the magnetic saturation phenomenon so that the detection is faster and more accurate; the probe has simple structure, small volume and flexible operation, the measurement range is up to 0-180 degrees; and the light-emitting diodes are used for display, and the read numbers are more intuitive and clearer and are easy to observe.

The invention discloses a switched reluctance motor for an electric automobile. Stator teeth are composed of branch excitation teeth and auxiliary teeth which are equal in number and are arranged in astaggered mode; a V-shaped groove is formed in the middle of the inner end plane of each branch excitation tooth; a V-shaped opening is aligned to the center of a rotor sleeve; each branch excitationtooth is divided into two same branch teeth by the V-shaped groove; the non-branch part between each branch tooth and a stator yoke is a branch tooth yoke part; a winding is wound on the branch toothyoke part; and a plurality of block rotors are uniformly arranged on the outer wall of the rotor sleeve in the circumferential direction. By virtue of the switched reluctance motor, the excitation teeth are arranged to be of a branch structure, so that the problem that the local magnetic density between teeth is too high is solved; a local position saturation phenomenon of the teeth can be reduced at the maximum inductance position; the maximum inductance value is increased under the same excitation condition, and then the output torque and efficiency of the motor are improved; and the branchexcitation teeth, the auxiliary teeth and the block rotors are combined, so that the excitation loop is further shortened.

The invention relates to a 1553B bus message transmission optimization method based on a hybrid genetic algorithm, and belongs to the technical field of bus message transmission. According to the method, firstly, a 1553B bus message scheduling mathematical model is established through a queuing theory; secondly, a genetic algorithm is introduced to quickly find out a 1553B bus message scheduling feasible solution; thirdly, the feasible solution found through the genetic algorithm is converted to an initial pheromone of an ant colony optimization algorithm; finally, a 1553B bus message scheduling optimal solution is obtained through local optimization and a positive feedback mechanism of the ant colony algorithm. Simulation test results show that when the improved genetic algorithm is used to optimize 1553B bus message transmission, the bus utilization rate is increased under the condition that a maximum delay time requirement and a communication real-time performance requirement of each message are met, bus message congestion and saturation phenomena are effectively relieved, the difficult problem in bus load balancing is solved, and the capability of handling the asynchronous message is relatively good.

The invention relates to an erythritol continuous solventing-out membrane crystallization method. The method comprises feeding an erythritol crystallization mother liquid into a hydrophobic hollow tube membrane module tube-side passage, adding a solventing-out agent through a membrane module shell-side passage, feeding the solventing-out agent into the crystallization mother liquid through passing through a pervaporation ethanol permselective membrane so that the crystallization mother liquid gradually forms supersaturation and precipitates crystals, filtering the crystal slurry separated from the membrane module tube-side passage, carrying out washing and drying to obtain erythritol crystals, feeding the filtrate, washing water and a liquid flowing out of the membrane module shell side into a normal pressure rectifying column together, and feeding the regenerated solventing-out agent at the top of the rectifying column into the membrane module shell-side passage for recycling. The method realizes full continuous production of the erythritol solventing-out crystallization process and effectively prevents the local high over-saturation phenomenon and excessive nucleation phenomenon caused by direct use of a solventing-out agent in the crystallization mother liquor. The solventing-out agent can be recovered and recycled and has the advantages of low production cost, less three waste discharge and energy saving.

The invention relates to a cold-rolled steel strip shape control system for actively preventing saturation phenomenon of an executer. The cold-rolled steel strip shape control system comprises a strip shape deviation computing module, a strip shape deviation signal filtering processing module, a steel strip form multi-variable optimization controller, a compensation regulation module and a rolling mill transmission device, wherein one output end of the rolling mill transmission device is connected with the strip shape deviation signal filtering processing module through a real-time position state acquiring module of the rolling mill transmission device and a current strip shape regulation and control capability online evaluation computing module; the other output end of the rolling mill transmission device is connected with the compensation regulation module; the third output end of the rolling mill transmission device is connected with an online strip shape measuring module through a rolling mill outlet strip shape; and the output end of the online strip shape measuring module is connected with the strip shape deviation computing module. By adopting the cold-rolled steel strip shape control system, the problem of poor strip shape control effect is solved, the saturation phenomenon occurring probability of rolling mill transmission equipment is lowered to the maximum extent, the service life of a strip shape control device is prolonged, and the prolonging of the service life of the rolling mill equipment and control over the production cost are facilitated.