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702 results about "Controller design" patented technology

Robust adaptive model predictive controller with tuning to compensate for model mismatch

An MPC adaptation and tuning technique integrates feedback control performance better than methods commonly used today in MPC type controllers, resulting in an MPC adaptation/tuning technique that performs better than traditional MPC techniques in the presence of process model mismatch. The MPC controller performance is enhanced by adding a controller adaptation/tuning unit to an MPC controller, which adaptation/tuning unit implements an optimization routine to determine the best or most optimal set of controller design and/or tuning parameters to use within the MPC controller during on-line process control in the presence of a specific amount of model mismatch or a range of model mismatch. The adaptation/tuning unit determines one or more MPC controller tuning and design parameters, including for example, an MPC form, penalty factors for either or both of an MPC controller and an observer and a controller model for use in the MPC controller, based on a previously determined process model and either a known or an expected process model mismatch or process model mismatch range. A closed loop adaptation cycle may be implemented by performing an autocorrelation analysis on the prediction error or the control error to determine when significant process model mismatch exists or to determine an increase or a decrease in process model mismatch over time.
Owner:FISHER-ROSEMOUNT SYST INC

Control system and method for a universal power conditioning system

A new current loop control system method is proposed for a single-phase grid-tie power conditioning system that can be used under a standalone or a grid-tie mode. This type of inverter utilizes an inductor-capacitor-inductor (LCL) filter as the interface in between inverter and the utility grid. The first set of inductor-capacitor (LC) can be used in the standalone mode, and the complete LCL can be used for the grid-tie mode. A new admittance compensation technique is proposed for the controller design to avoid low stability margin while maintaining sufficient gain at the fundamental frequency. The proposed current loop controller system and admittance compensation technique have been simulated and tested. Simulation results indicate that without the admittance path compensation, the current loop controller output duty cycle is largely offset by an undesired admittance path. At the initial simulation cycle, the power flow may be erratically fed back to the inverter causing catastrophic failure. With admittance path compensation, the output power shows a steady-state offset that matches the design value. Experimental results show that the inverter is capable of both a standalone and a grid-tie connection mode using the LCL filter configuration.
Owner:VIRGINIA TECH INTPROP INC

Video gaming apparatus for wagering with universal computerized controller and I/O interface for unique architecture

A computerized wagering game apparatus is disclosed. The invention comprises a universal computerized game controller operable to control a computerized wagering game. The apparatus includes a video display device for providing a visual representation of a signal provided by the computerized game controller such that the video display device displays at least one visual image selected from the group consisting of a) computerized wagering game status information and b) symbol elements that change with the play of the wagering game. A communication port communicatively coupled to the computerized game controller is provided, as well as an interface assembly comprising one or more user interface devices. An I/O interface is configured to communicatively couple the interface assembly to the communication port. A method for reconfiguring a computerized wagering game apparatus having a harness for associating memory with output devices in the apparatus is also disclosed. The method comprises a) removing an original special-purpose computerized game controller used to control a computerized wagering game from the apparatus, the original computerized game controller designed to and capable of working exclusively with a particular computerized wagering game apparatus; b) inserting a universal computerized game controller operable to control a video wagering game that can be played on the video wagering game apparatus and an I/O interface that operatively couples the universal computerized game controller to user interface devices of the wagering game apparatus; and c) sending signals from the computerized game controller through the I/O and harness to confirm proper communication between the computerized game controller and the user interface devices.
Owner:IGT

Intelligent electric vehicle path tracking model prediction control method

The invention relates to an intelligent electric vehicle path tracking model prediction control method, belonging to the technical field of control. The aim of the invention is to adopt the intelligent electric vehicle path tracking model prediction control method, wherein the model prediction control method can take account of the safety constraints of a whole vehicle simultaneously and realizeseclectic optimization among vehicle path tracking performance, safety and whole vehicle performance effectively. The method gives thought to intelligent electric vehicle path tracking model building in limited conditions and yaw stabilization controller design based on model prediction control as well as the tracking performance of the vehicle, the safety of the vehicle, the whole vehicle performance, driving comfort and saving and control of energy in the process of carrying out control strategy deduction, and improves the dynamic performance of the whole vehicle. The method gives thought tothe tracking performance of the vehicle (path following and speed following), the safety of the vehicle (preventing slipping, locking, sideward inclining or drifting), the whole vehicle performance (accelerating and braking performance), driving comfort (the change of torque cannot be too great) and saving and control of energy (saving energy on the premise of meeting the performance). The dynamicperformance of the whole vehicle is improved.
Owner:JILIN UNIV

Nonlinear robust controller design method based on back-stepping and sliding mode control technologies and aimed at nonlinear model of quad-rotor unmanned plane

The invention discloses a nonlinear robust controller design method based on back-stepping and sliding mode control technologies and aimed at a nonlinear model of a quad-rotor unmanned plane. A sliding mode controller of a speed-constant reaching law is designed to an attitude angle system of the quad-rotor unmanned plane, and rapid tracking for the attitude angle is ensured. To realize track tracking for the spatial position of the quad-rotor unmanned plane, a sliding mode surface and a virtual control quantity are constructed according to a stepping back control idea to realize nonlinear control law design and system stability design from the kernel to the external layer of a system. After an equation of the related virtual control quantity is obtained, an expected track value of the attitude angle is obtained by solving the equation via arithmetic inverse operation, and a design method of the speed-constant reaching law is used to determine a final input control law of the quad-rotor unmanned plane system. According to the method of the invention, the characteristic that sliding mode control is uncertain for the model and insensitive to external interference is utilized, robust trace tracking for the nonlinear quad-rotor unmanned plane can be controlled under interference.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

WAMS (wide area measurement system) based low-frequency oscillation coordinated damping control method for electric power system

The invention relates to a WAMS (wide area measurement system) based low-frequency oscillation coordinated damping control method for a power system, and belongs to the technical field of low-frequency oscillation analysis and control of power systems. The method includes adopting a hierarchical clustering technology to perform primary region division according to power angle curves or angular velocity curves obtained after preprocessing, performing low-frequency oscillation mode identification on the system on the basis of a Prony identification algorithm, adopting a PSS (power system stabilizer) to inhibit regional oscillation modes for strong correlation generators with generated low-frequency oscillation modes belonging to regional oscillation modes, introducing wide-area signals of other regions for generators with generated low-frequency oscillation modes belonging to inter-region oscillation modes, designing a controller for a reduced mathematic model of an identification system, and solving parameters of the controller by an LMI (linear matrix inequality). By the low-frequency oscillation controller design method, in a regional and hierarchical control mode, coordinated damping control of the power system is realized.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2

Method and apparatus for creating a user program for a safety controller

A method for creating a user program for a safety controller designed to control an automated installation having a plurality of sensors and a plurality of actuators involves several programming steps. The user program comprises a first program portion, in which safety-related program variables are processed in failsafe fashion, and comprises at least one second program portion, in which non-safety-related program variables are processed, wherein failsafe processing is not necessary for the non-safety-related program variables within the second program portion. The method steps involve a step of defining a number of safety-related program variables, a step of defining a number of non-safety-related program variables, a step of selecting a safety-related program variable from the number of safety-related program variables, a step of selecting a first non-safety-related program variable from the number of non-safety-related program variables, wherein the first non-safety-related program variable is repeatedly assigned an instantaneous value when the user program is executed, a step of defining at least one assignment condition which is processed when the user program is executed, a step of defining an association which associates the selected first non-safety-related program variable with the selected safety-related program variable, wherein the instantaneous value of the selected first non-safety-related program variable is assigned to the selected safety-related program variable depending on the assignment condition, when the user program is executed.
Owner:PILZ (COMPANY)

Single rotor wing unmanned aerial vehicle three-freedom degree semi-physical simulation platform and experimental method

The invention discloses a single rotor wing unmanned aerial vehicle three-freedom degree semi-physical simulation platform and an experimental method. According to the simulation platform, a single rotor wing helicopter is arranged on a universal ball joint on a top end of a three-freedom degree aircraft rotary table; an airborne attitude sensor is arranged at a geometric central part of the single rotor wing helicopter; an airborne assistant controller is arranged in the single rotor wing helicopter; the airborne attitude sensor and the airborne assistant controller are respectively connected with a simulation controller system; and the simulation platform further comprises a displacement variation virtual scene on-line display computer which is connected with the simulation controller system. The method comprises the steps of: according to a simulation task, utilizing modules and controls in an x-PC toolbox to operate Simulink software on a host computer, and building a model block diagram for a simulation system. By utilizing the simulation platform and the experimental method, the high efficiency, practicability and dependability of a single rotor wing helicopter controller design are improved; and experiments can be safely carried out, an unmanned aerial vehicle flight control algorithm can be visually simulated, and the attitude information of the single rotor wing helicopter can also be actually shown.
Owner:TIANJIN UNIV

Prediction model based hypersonic aircraft sliding-mode control method

The invention discloses a prediction model based hypersonic aircraft sliding-mode control method. The method is used for solving the technical problem of difficulty in engineering realization by existing hypersonic aircraft adaptive discrete control. The method includes: obtaining a strict feedback form of a height subsystem by reasonable assumption, and building a discrete form of an original system through an Eulerian method; building a four-step prediction model of the original system by unceasing forward prediction, wherein the model only includes an equation; enabling the prediction model to provide the relation of height output at a future time and current system state and control input, wherein the relation can be used for computing numerical values of lumped uncertainties of the system at the historical moment, and the numerical values are used for feedback design of a controller; and combining lumped nominal information further, and using a discrete reaching law to design the sliding-mode controller so that robustness of the system is improved. The prediction model based hypersonic aircraft sliding-mode control method has the advantages that the discrete prediction model is built to acquire system nominal and uncertain information, design of virtual control variables is not needed, the controller is simple and practical in design, and the method is suitable for engineering application.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
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