94 results about "Gain scheduling" patented technology

The invention discloses a method and a system for resisting dense forwarding type defraud interference of an airborne radar, and the resistance of dense forwarding type defraud interference is realized through an interference scout module and an interference filter and elimination module. Interference scout is used for carrying out the PD (probability of defraud) treatment on data received by a radar; the CFAR (constant false alarm rate) detection is carried out on data in a clear area; a detection result direction of arrival is estimated; an interference direction of arrival is estimated with combination of the detection result of a plurality of wave positions. In the interference filter and elimination treatment, a sum beam pointing to the interference direction is formed according to an interference scout result; the sum beam pointing to the interference direction is used as an auxiliary passageway, an existing space passageway is used as a main passageway, the method of GSC (gain scheduling control) is adopted to filter and eliminate interference, and the channel covariance matrix of the interference is estimated according to an interference sample selected from the clear area. By adopting the method and the system, the difficult problem of inhibition on dense forwarding type defraud interference is solved, the dense forwarding type interference is fundamentally filtered and eliminated, false alarms caused by the dense forwarding type interference are reduced, adverse effects on a CRAR detection threshold and the STAP (space time adaptive processing) performance are eliminated, the detection performance of a radar target is improved, the system is simple and easy to realize, and an engineering application value is provided.

A system (400) and method of determining fuel demands of a locomotive engine (10) based upon engine speed and power produced by the engine at a given time, so to optimize the engine's power output for a load while reducing engine emissions. The engine control architecture comprises three interrelated control loops (100-300). A primary feedback control loop (100) employs integral type control with gain scheduling to regulate engine speed to commanded slew rated based upon the locomotive's operator commands. A second control loop (200) provides an active, feed forward or predictive control consisting of a plurality of correction functions each utilizing a Taylor series having coefficients for each term in the series, the coefficients being modified to adapt the system to the engine with which it is used. A control third loop (300) optimizes reference speed slew rates and engine load rates by providing feedback of nominal engine fuel requirements or fuel demand, corrections to fuel demand based upon outputs from the second control loop, speed error values, and ambient conditions.

Systems and methods of adaptive control for uncertain nonlinear multi-input multi-output systems in the presence of significant unmatched uncertainty with assured performance are provided. The need for gain-scheduling is eliminated through the use of bandwidth-limited (low-pass) filtering in the control channel, which appropriately attenuates the high frequencies typically appearing in fast adaptation situations and preserves the robustness margins in the presence of fast adaptation.

The invention provides an all working condition standard emission control method for a thermal power unit denitration system. The method comprises the steps that a main ring PID controller, a sub-ringPID controller and a feedforward controller are arranged in a denitration control system; the main ring PID controller calculates an ammonia injection control signal according to an outlet NOx concentration set value and an outlet NOx concentration feedback signal; the feedforward controller calculates an ammonia injection feedforward control signal according to the purge correction NOx concentration, the NOx estimated concentration, the inlet NOx concentration and the flue gas flow; and the sub-ring PID controller controls the opening of an ammonia injection valve according to the ammonia injection control signal, the ammonia injection feedforward control signal and an ammonia flow feedback signal. According to the invention, a gain scheduling model and an hour mean model are added intoa main ring to realize automatic control of the variable working condition of the denitration system; an inlet concentration purge correction model is introduced into a sub-ring to realize dynamic ammonia injection correction; the ammonia injection is accurately controlled; and a technical support is provided for whole process robustness and all working condition standard emission.

The invention discloses an automatic load-variable multi-variable control method for an air separation device. According to the method, a module 1, namely a gain scheduling module, a module 2, namely a dynamic multi-variable model prediction control module, and a module 3, namely a process real-time optimization module are involved. The method comprises the following steps that: the module 3 calculates the optimal steady state value of a process variable related to load change according to the load-variable requirement of the device and sends the optimal steady state value to the module 2; the module 1 determines a prediction model adopted by a controller of the module 2 at the moment according to the current value of a scheduling variable; and the module 2 gradually pushes the device to the optimal steady state working point which is calculated by the module 3 on the premise of ensuring product quality and not going against equipment constraints. By the method, the problems of mutual decoupling of energy and a material, nonlinear control and the like in the wide-range load-variable process of the air separation device can be radically solved, smooth and quick transition among different working conditions is realized, and the load-variable operation quality and speed of the air separation device are ensured.

A magnetically levitated transporter comprising a plurality of bogies attached thereto and traveling over a track comprising a plurality of rails, and a method for operating such transporter, comprising a plurality of magnets attached to each bogie, a plurality of the magnets being offset outboard with respect to the rails and a plurality of the magnets being offset inboard with respect to the rails, and a computer control system employing gain scheduling to control current provided to each of the magnets.

The invention provides a conservation-reducing gain scheduling two-degree-of-freedom [mu] controller for an aero engine. The conservation-reducing gain scheduling two-degree-of-freedom [mu] controllerfor the aero engine comprises a conservation-reducing two-degree-of-freedom [mu] controller group solving module and a degradation parameter estimation loop. According to the conservation-reducing gain scheduling two-degree-of-freedom [mu] controller for the aero engine, the degradation parameter estimation loop is additionally arranged, a gain scheduling controller group is improved to obtain the conservation-reducing two-degree-of-freedom [mu] controller group solving module, reduces the perturbation range of an uncertainty model is reduced, and the conservatism of a robust gain schedulingcontroller is reduced. The degradation parameter estimation loop realizes the reliable estimation of degradation parameters, and then traditional scheduling parameters are combined to realize the gainscheduling control when the engine performance is degraded, the control accuracy of the gain scheduling is improved to the greater extent when the engine performance is degraded, the control system transition time is shortened, the dynamic deviation and static deviation are reduced, high robustness and low conservation are achieved, and the performance of an engine is given to full play.

The invention introduces a design method and control method of a robust pitch controller above the rated wind speed of a wind power generator. The pitch controller design method first establishes the blade load model, performs vector transformation to achieve decoupling, and linearizes the decoupling model in the vertex set of the scheduling parameter convex set; secondly, converts the model into an LPV system, and uses H The ∞ theory standardizes the model as a standardized augmented control object containing performance indicators, uses the linear matrix inequality method to design the controllers on the vertex set of the convex set of scheduling parameters, and uses the gain scheduling principle to obtain the global pitch controller, and finally uses the vector The inverse of the transform yields the actual control signal.

A system and method for controlling a digital pulse-width modulated power converter achieves a fast large-signal transient response while maintaining a slow response near the steady-state operating point in order to assure stability and to reduce the system's susceptibility to noise. Digital output error samples are processed through a gain scheduling block that applies a non-linear gain function to produce a weak loop response when the system is near its steady-state equilibrium point and a strong loop response when large transients are encountered. The resulting system maintains a fast transient response to large error signals while reducing noise and loop jittering and assuring loop stability.

The invention provides a self-adaptive I/O (Input / Output) scheduling method of a multi-control storage system. The self-adaptive I/O scheduling method of the multi-control storage system has the advantages of being capable of achieving load balance of a multiple controller architecture and among controllers; avoiding risk and performance choke points caused by single controller failure; supporting a plurality of host connecting interfaces; supporting an ISCSI (Internet Small Computer System Interface), an FC (Fibre Channel), an InfiniBand and 10 gigabit network connection; being capable of providing high bandwidth IB (InfiniBand) and the 10 gigabit network connection for users at the same time; and meeting the differentiation requirements of customers for high bandwidth and high performance. The invention relates to I/O scheduling of the multi-control storage system and provides the I/O scheduling method among multiple controllers. When the multi-control storage system accepts an I/O request from an application layer, the self-adaptive I/O scheduling method of the multi-control storage system can be utilized to schedule the I/O request to the multiple controllers to perform simultaneous concurrent execution, not only allocates unallocated I/O requests to low load controllers, but also reschedules I/O requests to lower load controllers from overload controllers, so that the load state of every controller in a system is improved, I/O load scheduling and balance on multi-control nodes are achieved, potentials of equipment are fully scheduled, and the performance of the system is improved.

Methods and systems for adaptively controlling process parameters in semiconductor manufacturing equipment. An embodiment provides for gain scheduling of PID controllers across recipe steps. One embodiment provides a method for controlling a chuck temperature during a semiconductor manufacturing process, the method employing a first set of proportional-integral-derivative (PID) values in a PID controller to control the chuck temperature at a first setpoint in a first step of a process recipe and employing a second set of PID values in the PID controller to control the chuck temperature at a second setpoint, different than the first setpoint, in a second step of the process recipe. The methods and systems provide reduced controller response times where process parameter setpoint between steps of a process recipe span a wide range.

The adaptive reference model algorithm uses a gain scheduling feature combined with a customized Least-Squares routine as an adaptive method for adjusting feedback control so as to account for variations in Transfer Function (G), thereby optimizing the effectiveness of the Active Vibration Control (AVC) System. The Least-Squares routine identifies the transfer function in a background process without interruption of closed loop vibration control. This identification approach is accomplished without intentional interrogation of the AVC actuators and without intentional vibration level changes. For this adaptive control logic, the dynamic relationship between AVC actuators and AVC sensors is represented by a mathematical model of Transfer Function (G). The mathematical model of Transfer Function (G) is continuously updated by the Least-Squares routine. A feedback gain (H) is computed from the mathematical model of Transfer Function (G), and the feedback gain (H) is updated each time the mathematical model of Transfer Function (G) is updated.

The invention relates to the field of numerical control machine tools, and particularly discloses a contour error suppression method for a digital twin-driven multi-axis numerical control machine tool. The method comprises the steps of S1 establishing a virtual model of a digital twinborn body corresponding to a physical entity, and adopting a multi-parameter gain scheduling control strategy based on a global task coordinate system, so as to obtain a time-varying coupling mechanism model of a multi-axis feeding system; establishing a data driving model of the multi-axis feeding system by using signal testing and machine learning; S2 performing virtual-real synchronization, and establishing a bidirectional sensing relationship between the digital twinborn body and the physical entity through a communication protocol with strong compatibility; S3 dynamically estimating a contour error; and S4 contour error suppression: according to the pre-estimation model, adopting a multi-objective optimization algorithm to obtain an optimal motion control parameter and a track maximum limiting speed corresponding to the optimal motion control parameter. By adopting the technical scheme of the invention, the contour error can be effectively reduced.

The present invention involves a system and method of model-based fault detection for a vehicle steer-by-wire system. The method includes providing a steer-by-wire fault detection unit to implement fault detection for the fault occurrence in sensors, actuators, and the controlled plant. The steer-by-wire fault detection unit is composed of a residual generator and decision-making unit. The residual generator generates a series of residual signal which are difference between the estimation signals based on a steer-by-wire controlled plant mathematical model and the actual measurement signals of steer-by-wire controlled plant. The decision making unit determines whether any faults have occurred by applying a fault test rule for residual signals. The fault detection for the steer-by-wire system includes the influence of system uncertainty and nonlinearity, A robust gain scheduling H^∞ fault detector is implemented to generate residual signals to reduce the effect of system uncertainty and nonlinearity for the residual signals. Therefore, the fault detection system is robust with respect to the model uncertainty, external noise and dynamic gain change, and is sensitive to faults occurrence in the steer-by-wire controlled plant.

An electronic system for stabilizing steering of a model vehicle may provide a curvature steering control of an RC vehicle. The approximate curvature control of the RC vehicle determined using error integration to achieve full steering. Application of a leaky integrator may be used to minimize steering memory. The leak factor may be based off gain scheduling of the steering input.

The invention discloses a gain scheduling control method for a magnetic suspension molecular pump. The method comprises the following steps of: calling a high-rigidity and high-damping control parameter to control the magnetic suspension molecular pump by using a dispersion PID (Proportion Integration Differentiation) controller when a rotor rotates at a low rotating speed, and gradually starting a displacement cross feedback controller when the speed of the rotor rises to a medium-low speed to effectively suppress rotor precession in the rotating process of the rotor and vibration caused by the structural mode of a system; when the rotating speed of the rotor reaches a medium speed, gradually switching the parameter of the dispersion PID controller to a low-rigidity and low-damping control parameter; and when the rotating speed of the rotor reaches a medium-high speed, gradually starting a speed cross feedback controller to suppress rotor nutation in the rotating process of the rotor and ensure that the rotor can stably reach a rated working rotating speed. Due to the adoption of the method, the technical problem of vibration caused by the rotor gyroscopic action in the working process of the molecular pump and the structural mode of the system is solved, the rotor vibration can be effectively suppressed in the working process of the molecular pump, and stable running of the magnetic suspension molecular pump can be ensured.

The invention provides a robust gain scheduling control method based on regional pole assignment. The realization principle is as follows: the controlled object is divided into a linear time invariant part and a parameter module by the method, wherein the parameter module is used for reflecting the nonlinear characteristic, time variant characteristic and certain uncertainty of the object; the nominal part is linear time invariant and the parametric variation part varies along with variation of the parameter module of the controlled object, thus ensuring the closed-loop system to satisfy the robust stability and robustness and have specified dynamic characteristics; the performance indexes are written into integral quadratic constraints under a unified framework according to the index requirements; in particular, the dynamic characteristics can be directly reflected by closed-loop poles on the position of the complex plane; therefore the index requirements of the dynamic characteristics are realized through regional pole constraints; and the constraints given by the performance index requirements are transformed into linear matrix inequality (LMI) systems and a solver in an LMI toolbox provided by a matrix laboratory (MATLAB) is utilized for solving, thus finally obtaining the controller satisfying the requirements.

The invention provides a space rendezvous system gain scheduling control method with linearization errors taken into consideration, and relates to a spacecraft orbit rendezvous gain scheduling control method. The space rendezvous system gain scheduling control method solves the problem that due to the fact that according to an existing aircraft orbit rendezvous control method, input saturation and parameter uncertainty caused by the linearization errors are ignored, time consumption is high when an aircraft orbit rendezvous task is completed. According to the space rendezvous system gain scheduling control method, the parameter uncertainty caused by the linearization errors is taken into consideration and endowed with exact meanings, an aircraft orbit rendezvous relative movement model is established, a gain scheduling controller of an aircraft orbit rendezvous is then designed, the aircraft orbit rendezvous is controlled through the gain scheduling controller, and the rendezvous task is completed. The space rendezvous system gain scheduling control method is mainly used for controlling the aircraft orbit rendezvous.

The invention relates to an automatic gain scheduling method for wind power plants distributed as the priority level according to blower involvement and belongs to the technical field of energy management system of power systems. The automatic gain scheduling method includes classifying blowers into common blowers and marker blowers according to power generation capacity of the blowers and scheduling the same in a gain manner, and giving the priority to involving all the marker blowers to generate power; classifying the marker blowers from low to high by a first level, a second level and a third level; giving the priority to involving all the blowers at high level to generate power; performing no power ration control at the third level which is the highest level; receiving gained control targets of dispatching, wherein when the gained control targets are larger than or equal to loading capacity, the dispatching command is that all the blowers generate power freely; when the gained control targets are smaller than the loading capacity, power ration control on blower involvement is performed; when on-grid gain is smaller than the gained control targets *95%, guaranteeing complete involvement of the marker blowers at the first level, the second level and the third level according to the sequence, and then adjusting the common blowers. The automatic gain scheduling method is simple and easy to realize, power generation capacity of the wind power plants can be increased, and fault rate of the blowers can be decreased.

A steering system (10) and method (70) for controlling the steering of a vehicle having a steering assembly including a steering wheel (12), a steering column (14) connected to said steering wheel (12), and an electric motor (20) operatively engaged with the steering assembly for supplying torque assist. A steering angle sensor (32) is employed for sensing an angular position θ_c of the steering column (14). The steering system has first and second H-infinity controllers (64A and 64B) coupled in a feedback path (44) for generating first and second feedback signals as a function of the driver torque and first and second characteristics (J_C and K_C) of the steering system. One of the first and second feedback signals is selected and the selected feedback signal is combined with a feedforward signal to generate a motor control signal (U) as a function of the estimated torque.

The invention provides a self-gain-scheduling PID (proportion integration differentiation) controller of a double-in double-out system of a heat-engine plant. Through a quick/slow loop detection setter, a quick/slow loop control mode switch, quick and slow loop feedforward controllers and quick and slow loop feedforward-feedback comprehensive arithmetic units, and through lap joint of proper modules, relay feedback control of a general double-in double-out system loop is realized, critical vibration information of the process is measured, and under the condition that a controlled system mathematic model is not known, P, I and D parameters of the double-in double-out system loop can be automatically set in closed-loop control according to stability margin as required; according to changes of actually-measured operation condition signals and deviation signals, optimal P, I and D parameters of quick and slow loops are automatically inferred in real time, transition time of a control system is reduced to the utmost, and dynamic and static deviations of the control system are reduced. By the self-gain-scheduling PID controller, parameter setting of the multivariable control system becomes more quick and scientific, and the control system has high robustness.

The invention discloses a magnetic suspension flywheel buffeting weakening method based on sliding mode variable structure control; the method uses a generalized description function method of a sliding mode variable structure control system and an adaptive unscented Kalman filtering algorithm to weaken signal buffeting, takes buffeting imported by the variable structure control and the system stability design as research objects, starts from variable structure control buffeting inhibition and present conditions and existing problems of a DF method applied in a non-linear system, emphasizes onstability analysis of a frequency correlation description function N (A, [omega]) and a variable structure switching gain adaptive adjusting method, proposes the adaptive unscented Kalman filtering (AUKF) algorithm, and designs a H[delta] sliding mode controller based on gain scheduling, thus verifying the validity of the proposed buffeting adjusting and inhibition method. The method ensures thesliding mode variable structure control method not to be sensitive to extraneous disturbances, can ensure an excellent robustness, and can effectively weaken system buffeting caused by continuously switching of the flywheel structure.