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6577908 |
Adaptive feedback/feedforward PID controller
A system and method for adaptively designing self-tuning controllers, specifically PID controllers for process control systems. The method is based on a model-parameter interpolation, according to...
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6571135 |
Control unit for controlling a system with several coupled variables
For controlling multivariable systems, a control unit for controlling a system with several coupled control variables. The control unit includes controllers ( 10, 11 ) having associated control...
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6560585 |
Procedure for controlling a complex dynamic process
A procedure for controlling a complex dynamic process. According to the procedure, information is periodically acquired and values of recorded quantities are generated. The condition and the...
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6501998 |
Method for controlling a time-lagged process with compensation, and a controlling device for carrying out said method
A method is described for the closed-loop control of a time-delayed process having compensation, in particular for temperature control. After a setpoint value step-change, the manipulated variable...
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6499022 |
Method and apparatus for optimization of servo parameter values in a data storage device
A genetic process is used to tune servo parameter values in a disk drive. An initial population of individuals is generated each including a value for each of a plurality of servo parameters....
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6496749 |
Semiconductor producing apparatus and temperature control method therefor
A semiconductor producing apparatus is capable of quickly and accurately changing a controlled variable to a target value to thereby make the controlled variable quickly follow the target value....
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6480750 |
Controlling system and method for operating a controlling system
A controlling system having a controller which acts on a controlled system as a function of a manipulated variable and a number of controller parameters is intended to provide a given control...
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6445962 |
Auto-tuning in a distributed process control environment
An auto-tuner for use in tuning a control element in a process control network having distributed control functions includes a first tuning element located in the field device in which the control...
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6424873 |
Systems and methods for limiting integral calculation components in PID controllers
A control apparatus is disclosed that comprises a primary proportional, integral, differential (“PID”) controller capable of receiving a first setpoint and a first process variable and...
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6408228 |
Hybrid finite state machine environmental system controller
The present invention provides a sequencing control strategy for environmental system controllers that takes better advantage of the capabilities of the system elements to enhance performance and...
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6378672 |
Active vibration isolation device and its control method
A hybrid active vibration isolation device has an intermediate plate inserted between a vibration damping subject and a setting surface on which the vibration damping subject is set, and laminated...
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6353766 |
Method for generating control parameters from a response signal of a controlled system and system for adaptive setting of a PID controller
Setting parameters of a PID controller are obtained by feeding a step signal or another input signal to an assigned controlled system. The response signal emitted by the controlled system is...
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6343235 |
PID controller with protection of the integrator against saturation upon a rapid change of the reference variable
A PID controller has a parallel arrangement of a P-element, an I-element, and a D-element coupled to a first summation point for adding their respective output signals, a summation signal produced...
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6330484 |
Method and apparatus for fuzzy logic control with automatic tuning
A system and method for automatically tuning a fuzzy logic process controller is presented. A process under control is automatically assessed to determined process control characteristics...
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6317637 |
System and method for maintaining output continuity of PID controllers in response to changes in controller parameters
A PID control system and method which maintains continuity of the control output in spite of changes in controller parameters. The controller parameters include a proportional gain, an integral...
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6314327 |
Method for predicting future function values utilizing derivative samples
A system and method for calculating a future function value, such as velocity, for an object, from derivative values, such as acceleration, includes a sensor, such as an accelerometer, coupled to...
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6308106 |
Feed-forward controller with delayed command input
A system controller for a controllable system having an inherent time delay includes a delay module that receives a command input and provides a first output signal delayed in time from the command...
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6278902 |
Robot control method and robot control system
A DSP of a servo control circuit obtains a movement value of a servomotor for each axis for each position-speed feedback processing cycle in accordance with a move command value for each axis...
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6266580 |
Control apparatus and method of control system having dead time
A deviation between a target value of a quantity of state and an actual value of the quantity of state that is caused to follow the target value or a time-integral of the deviation is filtered....
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6226557 |
Method for the closed-loop control of a controlled system, in particular of an internal combustion engine
A method for the closed-loop control of a nonlinear controlled system in which a state variable of the controlled system is determined and an actuating value is determined using a control method...
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6181976 |
Adept data processor implementing function similation with inverse deviation variation weighting
A coefficient generator, data processing system and method of data reduction in correspondence with multiple-term parametric relationships, and particularly provides for data reduction in...
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6153998 |
Method of controlling a two-degree-of-freedom control system
There is provided a method of controlling a two-degree-of-freedom control system for controlling a controlled object. The method includes the steps of generating a first signal for feedforward...
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RE36926 |
Welding control using fuzzy logic analysis of video imaged puddle dimensions
A welding system includes an imaging system that takes frame by frame pictures of a weld puddle. The imaging system is located in the weld torch. From the images puddle length and width are...
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6131076 |
Self tuning system for industrial surveillance
A method and system for automatically establishing operational parameters of a statistical surveillance system. The method and system performs a frequency domain transition on time dependent data,...
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6081751 |
System and method for closed loop autotuning of PID controllers
A system and method for automatically tuning a PID controller resident within a PID control loop. The PID control loop includes a PID controller and a process. The process supplies a process...
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6078843 |
Neural network including input normalization for use in a closed loop control system
An apparatus and method for controlling a process using a neural network which operates as part of a closed loop control system. The state of the control system is defined by one or more process...
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6055459 |
Method for preventing windup in PID controllers employing nonlinear gain
A method of preventing windup in a PID controller when using a nonlinear gain parameter is disclosed that is used in the PID controller of a process control system. The PID controller is arranged...
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6041264 |
Deadband control assistant eliminating offset from setpoint
A deadband control assistant, operating as part of a control system, eliminates oscillation of a controlled process output around a desired setpoint. The deadband control defines a deadband range,...
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6025688 |
Alignment apparatus
An apparatus for moving a stage, supported by a base, to a target position. The apparatus includes a motor for driving the stage in X and Y directions, a laser interferometer for measuring a...
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6016763 |
Submersible unit and diving position control method therefor
A submersible unit having thrusters for changing a diving position based on a total work quantity, which is the sum of a first work quantity and a second work quantity. A proportional controller...
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5988849 |
Device and process for controlling the movement of an object
In the movement of objects, especially benches or robot arms, on a programmed path, the object must be moved into a new position as fast and as smoothly as possible. To this end, the control device...
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5971579 |
Unit and method for determining gains a of PID controller using a genetic algorithm
A unit and a method for determining gains of a PID (Proportion, Integral, Differential) controller using a genetic algorithm. A genetic algorithm tuning unit decodes an output value from an object...
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5974434 |
Method and apparatus for automatically tuning the parameters of a feedback control system
A new technique for adjusting the parameters of a feedback controller. A linear feedback controller includes proportional, integral and derivative (PID) controllers but is not limited to them. The...
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5875109 |
Adaptive flow controller for use with a flow control system
An adaptive airflow control system for positioning damper systems or controlling air units utilized in an environment control system is provided. The system is based on a fixed-gain,...
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5867384 |
Feedback controller
A closed loop feedback control system that operates to maintain a process variable at or near a process variable setpoint. The system includes a setpoint regulator that adjusts the value of a...
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5822740 |
Adaptive fuzzy controller that modifies membership functions
A direct adaptive fuzzy controller having an adaptation mechanism that modifies the locations of output membership functions to improve performance of the fuzzy controller. The controller has a...
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5819845 |
Temperature control method for a heating/cooling system
A temperature control method and apparatus therefor controls an air temperature in a room by determining an error temperature between a set temperature and an actual room temperature. An auxiliary...
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5813587 |
Laminating machine register-length and web tension controller
A cascaded loop controller is used to control register or repeat lengths and web tension on laminating machines where the inner control loop utilizes register-length sensors near the unwind end of...
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5799869 |
Off-road heating control
Apparatus for heating and cooling an enclosed operator space in an off-road vehicle controlling evaporator fan speed, compressor clutch and condenser fan operation, and having sensors for detecting...
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5798941 |
Surge prevention control system for dynamic compressors
A surge prevention control system for use with a dynamic compressor provides a multiple module controller for operating an anti-surge valve to bypass flow around the dynamic compressor. The...
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5796608 |
Self controllable regulator device
A self tuning control system and a method for tuning such a system. The system has a controller formed by a PI controller and a proportional control unit with a mixing point therebetween to which...
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5764017 |
Servo loop compensation technique exhibiting improved bandwith
A servo control system is presented that provides improved bandwidth. The improved bandwidth is achieved by dividing the differential portion of the servo control system into two components. One of...
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5758047 |
Method of process controller optimization in a multivariable predictive controller
In a process control system, having a controller for providing robust control of a process, the controller utilizes a predetermined range control procedure the results being a control solution. The...
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5748467 |
Method of adapting and applying control parameters in non-linear process controllers
A non-linear process controller drives a process variable to be substantially equivalent to a set point based on the expected load disturbances within the process and on a measurement of the actual...
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5745362 |
Digital PID control apparatus
In the digital PID (P:proportional, I:integral, D:derivative) control apparatus of the present invention, in which a deviation is obtained from a controlling amount of an object to be controlled,...
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5742503 |
Use of saturation relay feedback in PID controller tuning
A method and an apparatus are provided for autotuning a parameter of a PID controller which is employed in a transfer function. The method includes steps of (a) providing a first specific value for...
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5726880 |
Method of and apparatus for controlling a process
The present invention relates to a method of controlling an output variable of a process having long dead times and delay times, for example for controlling the interior temperature of an absorber...
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5706193 |
Control system, especially for a non-linear process varying in time
A control system, especially for a non-linear process varying in time, includes a first controller, in particular a linear PID controller, which is able to be switched over via a switching input...
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5691896 |
Field based process control system with auto-tuning
A process control system controls a process through a control output signal based on a set point and a measured process variable. The process control system includes a control circuit having a set...
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5625552 |
Closed loop neural network automatic tuner
A closed loop neural network based autotuner develops optimized proportional, integral and/or derivative parameters based on the outputs of other elements in the loop. Adjustments are initiated by...
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