41 results about "Control saturation" patented technology

An apparatus of adaptively controlling saturation of an input image according to characteristics of the input image. The apparatus has a saturation calculating unit to sequentially calculate saturation values of each pixel composing an input image, and to output the calculated saturation values, a histogram analysis unit to accumulate interval values, each interval value corresponding to the saturation value of pixel and being allocated to at least one of two intervals, to calculate a gain corresponding to a cumulative value of each interval, and to output the gain, and a total gain calculating unit to calculate a total gain from the transferred gains of the respective intervals.

A volume level and crossfade controller with programmable fades and audio stream priority controls saturation for a multiple audio stream mixer. Start of fade and end of fade events trigger updates of relative volume level targets and volume ramps.

The invention discloses a tone mapping method for a high dynamic range image. The method comprises the following steps of: firstly, reading the high dynamic range image, and acquiring a log-domain brightness image of the high dynamic range image; secondly, estimating illumination components of the high dynamic range image by multi-scale weighted least squares (WLS) filtering to avoid the phenomenon of halo generated at a high light and shade contrast place; thirdly, recovering brightness components of the high dynamic range image by using a multi-scale Retinex method, eliminating the gray of a 1% part of each of two poles to prevent under-exposure and over-exposure, and adjusting the brightness degree of the image according to a self-adaptive adjustment function; and finally, recovering the color of the high dynamic range image by introducing an index control saturation method. The tone mapping method for the high dynamic range image is applicable to display and output of the high dynamic range image on low dynamic range equipment, generation of the halo can be avoided, and the displayed image has the characteristics of high contrast and good detail reproduction effect.

A crystallized cefathiamidine is prepared from the cefathiamidine solution through controlling pH to 3.5-6.5, adding proper solvent until the solution becomes cloudy, controlling saturation procedure and crystal growth speed while adding said solvent, separating and drying. Its advantage is uniform granularity. It can be used to prepare the medicines for treating the infection of staphylococcus aureus, pneumoccus, enterococcus, streptococcus, etc.

The invention relates to a multi-phase induction motor-specific subharmonic current suppression method, which includes the following steps: (A) current reference value processing; (B) current feedback value processing; (C) current regulation; (D) voltage reference value determination. Based on the vector control of a multi-phase induction motor, the method maps the current of the multi-phase motor into a corresponding synchronous rotating reference frame of a fundamental wave and each subharmonic orthogonal to each other by multiple synchronous rotating coordinate transformations, and uses proportional-integral controllers to respectively carry out tracking with zero steady-state error and combine to form an integral current controller. The method has the advantages that trapezoidal integration is adopted to increase integral accuracy, and supplemented by variable structure control, appropriate self-adaptive compensation is introduced to resist control saturation, so that static and dynamic performance is further enhanced; the method can suppress motor loss caused by the harmful subharmonic current of the multi-phase motor and the adverse affection of torque ripple, vibration noise and the like, and can utilize the positive effect of usable subharmonic; the method takes full advantage of the multi-phase motor, and enhances system performance.

The invention discloses a control method and system for a self-storage multi-terminal flexible straight system. The system controller is designed by using the reverse push method to realize the stability of the DC voltage and the rapid independent control of the active and reactive power. At the same time, a constraint command filter is introduced to solve the problem. The differential expansion and control saturation problems of reverse push control, and design compensation signals to solve the error problem of the filter, introduce adaptive control to ensure the robustness of the system to uncertain parameters, and use projection operators to optimize adaptive uncertain parameters , the control law of the system is designed based on the Lyapunov stability theory, which improves the anti-interference ability of the system and realizes the asymptotic stability of the whole system. Finally, a simulation model was built in the simulation software, and compared with the traditional PID control algorithm and the command filtering back-calculation algorithm, the simulation results show that the control method of the present invention has better robustness and dynamic response performance, and is a self-storage multi-terminal flexible The control algorithm of the straight system provides theoretical basis and technical support.

A control system (10) of a turbopropeller (1) including: a centralized control (24) configured to slave the screw propeller power PRW of the turbopropeller (1) to the screw propeller power set point PRWref and the screw propeller rotation speed XNP of the turbopropeller (1) to the screw propeller rotation speed set point XNPref, the centralized control (24) supplying fuel flow rate WF and screw propeller pitch β controls for the turbopropeller (1); a screw propeller rotation speed error limiter (12) saturating the screw propeller rotation speed error ΔXNP with a limiting valueΔ⁢⁢XNPsat⁡(min⁢ / ⁢max);and a screw propeller power error limiter (11) saturating the screw propeller power error ΔPRW with a limiting valueΔ⁢⁢PRWsat⁡(min⁢ / ⁢max).

The invention discloses a novel anti-integral saturation PID control method, which adds an anti-integral saturation link to the ordinary PID control method. When the PID control is saturated, the anti-integral saturation link combines the proportional item and the differential item to calculate the current integral item. This method is simple to implement, does not introduce any additional parameters, and can effectively suppress integral saturation, speed up the desaturation time, reduce overshoot, and ensure the robustness, reliability and stability of the system. The method of the invention can be applied to PID control systems in various forms.

A quadrature filter-based inverter control method without an AC voltage sensor. Firstly, the quadrature filter is constructed by using the second-order generalized integrator’s non-difference following characteristic of the specific frequency AC signal, and then the voltage observer of the three-phase grid-connected inverter is constructed by using the quadrature filter, in the two-phase stationary coordinate system , using the measured grid side current signal and the inverter controller output bridge terminal voltage reference signal as the input of the voltage observer to observe the grid voltage; combined with the three-phase grid-connected inverter in the two-phase static coordinate system The PR control realizes the operation control of the inverter under the condition of no AC voltage sensor. This method can avoid problems such as integral saturation, initial value sensitivity, and static error that may occur in conventional no-AC voltage sensor control while maintaining the stability of inverter control. and other advantages.

A method for controlling the first, second and third variables of a turbine engine according to the first, second and third control variables of the turbine engine, each of which may be saturated according to an operating parameter of the turbine engine. The method comprises delivering a first multivariable correction (120) of a first value for the three control variables; selecting (130) a first control variable to be delivered as a function of the minimum value, the maximum value and a value determined by the first correction; delivering a second multivariate correction (140) of a second value for the second and third control variables; and selecting (150) the values of the second and third control variables to be delivered among the values determined during the first correction and the values determined during the second correction.

The invention discloses an undisturbed soil sample expansion force testing device capable of controlling the saturation. The device comprises a base supporting system, wherein a lower disc is fixed on the base supporting system, a cutting ring base and a cutting ring are arranged on the lower disc, and the upper part of the cutting ring base is provided with an upper cover; a central circular groove and an annular groove are formed on the lower disc, a soil pressure sensor is arranged in the central circular groove, an annular water penetration plate is arranged in the annular groove, water-immersion circular grooves are formed on the annular water penetration plate, water-permeable stones are uniformly placed in the water-immersion circular grooves, and the bottom of the annular groove is connected with an external water injection system through a pipeline; a soil sample is placed between the lower disc and the cutting ring, and a water-permeable plate base which is provided with a water-permeable plate and water-permeable holes is arranged on the top of the soil sample; and a plunger, overflow equipment and vacuum extraction equipment are arranged on the upper cover. The device effectively solves the problems that testing devices for an expansion back pressure method, a pressurization expansion method and a balance pressurization method have relatively large disturbance on soil sample structures, cannot effectively control strict saturation states and are relatively long in testing time consumption.