44 results about "Model based controller" patented technology

A neuromuscular model-based controller for a robotic limb having at least one joint includes a neuromuscular model having a muscle model, muscle geometry and reflex feedback loop to determine at least one torque or impedance command to be sent to the robotic limb. One or more parameters that determine relation between feedback data and activation of the muscle model are adjusted consequent to sensory data from at least one of an intrinsic sensor and an extrinsic sensor. A controller in communication with the neuromuscular model is configured to receive the at least one torque or impedance command and controls at least one of position, torque and impedance of the robotic limb joint.

System and method for managing fermentation feed in a biofuel production process, comprising a dynamic multivariate predictive model-based controller coupled to a dynamic multivariate predictive model. The model is executable to: receive process information, including water inventory and biomass information, from the biofuel production process; receive a specified objective for the fermentation feed specifying a target biomass concentration; and generate model output comprising target values for a plurality of manipulated variables of the biofuel production process, including target flow rates of water and/or biomass contributing to the fermentation feed in accordance with the specified objective. The controller is operable to dynamically control the biofuel production process by adjusting the plurality of manipulated variables to model-determined target values to stabilize water/biomass balance in the fermentation feed in accordance with the specified objective, including the specified target biomass concentration.

Advanced combustion modes, such as PCCI, operate near the system stability limits. In PCCI, the combustion event begins without a direct combustion trigger in contrast to traditional spark-ignited gasoline engines and direct-injected diesel engines. The lack of a direct combustion trigger encourages the usage of model-based controls to provide robust control of the combustion phasing. The nonlinear relationships between the control inputs and the combustion system response often limit the effectiveness of traditional, non-model-based controllers. Accurate knowledge of the system states and inputs is helpful for implementation of an effective nonlinear controller. A nonlinear controller is developed and implemented to control the engine combustion timing during diesel PCCI operation by targeting desired values of the in-cylinder oxygen concentration, pressure, and temperature during early fuel injection.

A diesel engine (10) operates by alternative diesel combustion. Formation of fuel and charge air mixtures is controlled by processing a particular set of values for certain input data according to a predictor algorithm model (50) to develop data values for predicted time of auto-ignition and resulting torque, and also develop data values for control of fuel and air that will produce the predicted time of auto-ignition and resulting torque. The data values developed by the predictor algorithm and data values for at least some of the input data are processed according to a control algorithm (52) that compensates for any disturbance introduced into any of the data values for at least some of the input data being processed by the control algorithm. This causes the systems to be controlled by compensated data values that produce predicted time of auto-ignition and resulting torque in the presence of any such disturbance.

A method and apparatus for designing perturbation signals to excite a number of input variables of a system, in order to test that system for the purpose of obtaining models for the synthesis of a model-based controller. The method begins with providing input parameters of the system. A plurality of binary multi-frequency (BMF) signals are generated based on these input parameters and the frequency spectra of these BMF signals are calculated. One BMF signal is selected out of the set of BMF signals so that the frequency spectrum of the selected BMF signal most closely matches a desired frequency spectrum specified by the input parameters. The selected BMF signal is used as a first perturbation signal for testing the system. The selected BMF signal is also shifted by predetermined amounts of samples to create delayed copies of the original BMF signal to be used as additional perturbation signals.

A method and a device for tuning and control of industrial processes having varying material flow rate. An adder is configured to add excitation signals to the controller output signal. A measurement system is configured to measure a property in response to the excitation signals. A model based tuning unit is adapted to estimate the value of at least one parameter with unknown value of a process model structure describing the effect of varying material flow rate, based on the measurements of the property and the output signal from the controller, and to calculate a model that describes the dynamics from controller output to controller input based on the estimated value of the parameter, and to perform model based tuning of the controller based on the model that describes the dynamics from controller output to controller input.

The invention provides a simulation method for a four-rotor aircraft, and relates to a real-time simulation method of an unmanned aircraft. The simulation method for the four-rotor aircraft solves the problems that an existing semi-physical simulation system is huge in size, complex in connection, low in accuracy due to the fact that virtual state variables exist in simulation, and low in accuracy of a model obtained through modeling applying a controller design method based on the models and a numerical simulation system mechanism, wherein the controller design method based on the models and the numerical simulation system mechanism cannot be applied to modeling easily. According to the simulation method for the four-rotor aircraft, the actual aircraft is regarded as the controlled object and connected to a simulation circuit, and a reference is provided for the numerical simulation models obtained by mechanism modeling in MATLAB/Simulink, so that accuracy of aircraft mechanism modeling can be verified rapidly. A parameter recognition method is adopted so as to guarantee accuracy of objective models in numerical simulation, so that feasible controllers are verified in the numerical simulation and the controllers can be finally effectively applied to actual physical objects. The simulation method for the four-rotor aircraft is specifically applied to the field of four-rotor aircraft simulation.

An embodiment of the present invention has the technical effect of utilizing a model-based system and real time data to adjust a parameter of at least one valve. An embodiment of the present invention may reduce the need of multiple sensors within a fuel system by integrating a model-based controller with real-time or approximately real-time data to adjust a parameter of at least one valve. An embodiment of the present invention may utilize a model-based controller to calculate the fuel flow through the at least one valve, in or near real-time.

The invention relates to a method and to a model-based controller for controlling at least one part of a paper machine, to a paper machine having such a controller, to a computer program for executing the method according to the invention, and to a computer program product on which the computer program according to the invention is stored.; In order to achieve an improved or optimized operation mode of an "expanded drying section" of a paper machine - comprising the "actual" drying section, separated, if applicable, into pre-drying and post-drying sections with a size press located therebetween, a steam and condensate system, an exhaust air heat recovery system, a wet press and the white water - a model that includes the above system components is proposed, with which mass and energy balances for the system components as well as the specific energy consumption of the drying section are calculated, based on values for parameters relevant for the drying process.

A method controls an operation of a system. The system is operated by a controller. The controller is model-based controller determined according to a model of the system. The method updates the model, during the operation, based on an extremum seeking, and updates the controller based on the updated model.

The present invention is concerned with a model of a waste combustion process which is accurate and of limited computational complexity at the same time and thus is suitable for controlling or simulating a waste incineration plant. A pile of waste is represented by two layers, and the heat transfer from a gas combustion phase or flame above the pile is limited to a heat radiation interaction between the flame and upper one of the layers. The resulting model-based controller for a waste incineration grate takes into account a variability of the waste composition via filtered white noise. The controller can assist the operator in maintaining constant process conditions and maximizing the throughput of the plant at constant energy output, or realize a training simulator to educated operators in running a waste to energy plant secure, reliable and efficient.

A computing system for an unducted rotor engine with a variable pitch vane assembly in aerodynamic relationship with an unducted rotor assembly, including a sensor-based controller configured to execute a first set of operations and a model-based controller configured to execute a second set of operations. The first set of operations includes obtaining a first signal corresponding to a commanded low spool speed; obtaining a second signal indicative of a pitch angle corresponding to thrust output from the unducted rotor assembly and variable pitch vane assembly; generating a pitch feedback signal corresponding to a commanded adjustment to the pitch angle based at least on one or both of a variable blade pitch angle or a variable vane pitch angle. The second set of operations include obtaining a desired thrust output via a throttle input; determining, at least via a power management block, a commanded thrust output signal; receiving the commanded thrust output signal; and generating an output signal.

A vehicle, control system for operating a torque converter of a vehicle and a method of operating a torque converter. The control system includes a machine learning model and a model-based controller. The machine learning model is configured to receive a first set of measurements of operational parameters of the torque converter, and determine fit parameters for a model of the torque converter using the first set of measurements. The model-based controller is configured to receive a second set of measurements of operational parameters of the torque converter, determine a clutch pressure for the torque converter from the second set of measurements and the fit parameters, and apply the determined clutch pressure to the torque converter.

The disclosed systems and techniques enable dual mode operation for model-based controllers, wherein the controllers are capable of operating in both (i) a constrained solution mode, and (ii) an unconstrained solution mode. The dual mode operation improves control because it enables the use of constrained solution mode operation when possible (constrained solution mode often enables superior control) and enables the use of unconstrained solution mode when constrained solution mode is not possible (e.g., when it is impossible to develop the constrained solution with the time available). This enables superior control when compared to typical model predictive control (MPC) controllers.