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| Number | Title | Issue Date |
| 8150555 | Fluid pressure control apparatus/process A fluid pressure control apparatus for controlling a solenoid valve to increase and decrease a fluid pressure by varying a valve opening degree includes a controller to control the fluid pressure by varying a command current for driving the solenoid valve. The contr... | 04/03/2012 |
| 7853364 | Adaptive controller for ion source An ion source, often used for materials processing applications in a vacuum processing chamber, is provided with an adaptive control system. The adaptive control system has a microprocessor and memory that regulate the inputs of power and gas flow into the ion sourc... | 12/14/2010 |
| 7797082 | Apparatus and method for stiction compensation in a process control system An apparatus, method, and computer program for stiction compensation in a process control system are provided. A determination is made as to whether a valve is suffering from stiction. A control signal provided to the valve is adjusted in order to at least partially... | 09/14/2010 |
| 7337041 | Feedback control methods and apparatus for electro-pneumatic control systems Methods and apparatus related to feedback control for electro-pneumatic control systems are disclosed. An example electro-pneumatic control system comprises an electro-pneumatic controller and a secondary pneumatic power stage coupled to the electro-pneumatic contro... | 02/26/2008 |
| 7330344 | Method for driving actuators A method for driving a plurality of actuators having an output stage having multiple channels, by way of whose channels boost currents are conveyed to the actuators. In this method, a check is made as to whether rising edges of multiple boost currents are present si... | 02/12/2008 |
| 7295899 | Method and controller for setting a control element and a use of said controller For setting the position of a control element, a controller and method according to the invention provide for impressing a required temporal characteristic of the actuating signal onto a should-be value then using said should-be value as a time-variable signal for f... | 11/13/2007 |
| 7288921 | Method and apparatus for providing economic analysis of power generation and distribution An economic dispatch program optimally allocates load demand specifying real power and reactive power to be generated by a power plant among various power generators in a manner so that each of the power generators are operated within its optimal operating space as ... | 10/30/2007 |
| 7190149 | Method and apparatus for determining actual reactive capability curves A system for generating updated reactive capability curves of a generator operates the generator at a number of operating load levels and at a number of different power factors to collect data regarding the real and reactive power generated at each of the various op... | 03/13/2007 |
| 7167537 | 4-20 mA interface circuit A valve controller is disclosed. The valve controller includes an interface circuit having an input for connection to a controller, a processor in data communication with the interface circuit which is operable to generate a control signal for controlling a valve po... | 01/23/2007 |
| 7155319 | Closed loop control on liquid delivery system ECP slim cell A method for controlling liquid delivery in a processing chamber. The method includes generating an analog input (AI) signal proportional to a process variable and calculating an analog output (AO) signal based on a setpoint and a deadband. The setpoint is a target ... | 12/26/2006 |
| 7092795 | Turbine apparatus and governor for turbine In a turbine apparatus comprising a runner rotatable to be rotationally driven by a water, a gain of a derivative calculation element generating a derivative component of a control signal for controlling a flow rate of the water which derivative component is to be a... | 08/15/2006 |
| 7072744 | Turbine apparatus and governor for turbine In a turbine apparatus comprising a runner rotatable to be rotationally driven by a water, a gain of a derivative calculation element generating a derivative component of a control signal for controlling a flow rate of the water which derivative component is to be a... | 07/04/2006 |
| 7059132 | Steam generator feedwater control system for power plant In the control of feedwater to the steam generator in a power plant comprising one steam generator and a plurality of turbine plants, the water level in the steam generator and the flow rate balance between the steam flow rate and the feedwater flow rate of each tur... | 06/13/2006 |
| 6957127 | Dynamic current-to-pneumatic converter and pneumatic amplifier A dynamically balanced pneumatic relay amplifier and a current-to-pneumatic converter are disclosed. The relay has a balance plug, a supply plug positioned on top of the balance plug, a bead chain connecting the balance plug and the supply plug, and a vent plug posi... | 10/18/2005 |
| 6941217 | Microprocessor-based control system for gas turbine electric powerplant A microprocessor-based control system for a gas turbine electrical powerplant. the microprocessor-based control system controls the startup, operation, and shutdown of the gas turbine electric powerplant. The microprocessor-based control system of the present invent... | 09/06/2005 |
| 6912855 | Method for the primary control in a combined gas/steam turbine installation The aim of the invention is to improve a method for the primary control so that reserve power that is practically completely available for the effective frequency boost within seconds is available also in the stem turbine part of a gas/steam turbine installation. To... | 07/05/2005 |
| 6907082 | 4-20 mA interface circuit A 4-20 mA interface circuit for use, for example, in a valve controller, communicates with a two-wire loop. The interface circuit includes a power extraction circuit connected to the two-wire loop and operable to generate a DC operating voltage for use in powering t... | 06/14/2005 |
| 6898467 | Distributed control network for irrigation management A system and method for operating a distributed control network for irrigation management. The system incorporates several irrigation controllers wherein each of the controllers can transmit, receive and respond to commands initiated by any device or satellite contr... | 05/24/2005 |
| 6845300 | Control methods for electromagnetic valve actuators An electromagnetically operated valve assembly (28) has a first solenoid (58) and a second solenoid (60). An armature (56) having a valve stem (54) coupled thereto is positioned between the first solenoid (58) and second sol... | 01/18/2005 |
| 6819962 | Method of evaluating, expanding, and collapsing connectivity regions within dynamic systems An automated process defines and maintains connectivity regions within a dynamic network. The automated process requires an initial input of a network component around which a connectivity region will be defined. The process automatically and autonomously generates ... | 11/16/2004 |
| 6789000 | Microprocessor-based control system for gas turbine electric powerplant A microprocessor-based control system for a gas turbine electrical powerplant the microprocessor-based control system controls the startup, operation, and shutdown of the gas turbine electric powerplant. The microprocessor-based control system of the present inventi... | 09/07/2004 |
| 6725103 | Process control system A process control system in a multi-input/output coordinate control system for executing coordinate control of a main input. The process control system sets an operating point set value for an operating point of an n-th control output, generates the n-th control out... | 04/20/2004 |
| 6701223 | Method and apparatus for determining optimal control settings of a pipeline Pipelines are controlled by specifying operations along them. Control specifies sequential control values defining operations at each station to control the pipeline state. The time-dependent state is determinable by software calculations using continuous... | 03/02/2004 |
| 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 quality and a given control response in all operating states of... | 11/12/2002 |
| 6445980 | System and method for a variable gain proportional-integral (PI) controller A method for generating a valve drive signal using a variable gain PI controller in a mass flow controller. The method includes multiplying an error signal with a proportional gain factor to generate a proportional signal. The method also includes impleme... | 09/03/2002 |
| 6351692 | Method and apparatus for configuring a genset controller for operation with particular gensets A genset controller that is configurable for controlling a variety of types of gensets, as well as a method of configuring a genset controller for controlling a genset, are disclosed. The genset controller includes a memory for storing a plurality of soft... | 02/26/2002 |
| 6240336 | Control unit for an irrigation system A control unit for an irrigation system comprising a programmable electronic control unit having a plurality of output control lines for the control of actuators of the irrigation system and comprising a microprocessor for setting data that condition the ... | 05/29/2001 |
| 6167323 | Method and system for controlling gas system Flow sensors 41 and 42 for detecting a flow load including the presence of a flow of gas are provided in supply lines 2a through 2d for supplying a given gas into a treatment chamber 6. A CPU 40 is provided for previously storing control parameters corres... | 12/26/2000 |
| 6038494 | Control system for enhancing fish survivability in a hydroelectric power generation installation A system for controlling a hydroelectric power production facility includes sensors for detecting the presence of fish adjacent to the facility. A controller linked to the sensors controls the orientation of control surfaces associated with a turbine/gene... | 03/14/2000 |
| 5099411 | Digital method of controlling and regulating a turbine that has gas or steam flowing through it and device for carrying out the method A digital arrangement for controlling a gas or steam turbine in which operating parameters of the turbine are sensed at a regular rate. Control parameters are then calculated from the operating parameters by at least one control and regulating program wit... | 03/24/1992 |
| 4975238 | Control system for a nuclear steam power plant A control system for a nuclear steam power plant having a reactor, one or more once through steam generators and a turbine includes a reactor control subsystem responsive to a power demand input to cause the reactor to deliver thermal power commensurate w... | 12/04/1990 |
| 4577281 | Method and apparatus for controlling the control valve setpoint mode selection for an extraction steam turbine A microprocessor-based controller for an extraction type steam turbine-generator unit capable of selecting from a variety of predetermined control strategies and implementing corresponding valve position control loops by generating appropriate valve posit... | 03/18/1986 |
| 4550380 | Microprocessor-based extraction turbine control A microprocessor-based controller for an extraction type steam turbine-generator unit capable of selecting from a variety of predetermined control strategies and implementing corresponding valve position control loops by generating appropriate valve posit... | 10/29/1985 |
| 4523286 | Apparatus for making diagnosis of valve device in turbine system A diagnostic apparatus for diagnosising of a valve device in a turbine system comprises at least one of a pressure sensor for sensing hydraulic pressure in a hydraulic cylinder for driving a valve body of the valve device and a position sensor for sensing... | 06/11/1985 |
| 4464720 | Centrifugal compressor surge control system A surge control system is disclosed for centrifugal compressors which utilizes an algorithm to calculate a desired orifice differential pressure and compare the calculated result with an actual differential pressure. A controller is provided for operating... | 08/07/1984 |
| 4445180 | Plant unit master control for fossil fired boiler implemented with a digital computer An electric power plant, including a fossil fired boiler and a steam turbine, is operated by a control system including a plant unit master. The control system includes a boiler control for determining the inputs of fuel, air and water, and a turbine cont... | 04/24/1984 |
| 4404637 | Process control system A variable limit is utilized to prevent a position controller which requires a velocity set point signal from overdriving a stuck control valve. Control based on a comparison of the actual position to desired position is utilized unless the valve is stuck... | 09/13/1983 |
| 4368520 | Steam turbine generator control system A turbine control system which includes dual controllers having microcomputer processing circuits and capable of transmitting and receiving digital information to and from a plurality of valve position control circuits, also including their own microcompu... | 01/11/1983 |
| 4360882 | Process control system In a process in which both a turbine or motor and an expander are utilized to drive a compressor, the use of the expander is substantially maximized while still insuring that the driving force applied to the turbine or motor does not go below a low limit.... | 11/23/1982 |
| 4319320 | System and method for adaptive control of process A system and method for the adaptive control of a process in which a feed forward control signal corresponding to a process demand is calculated according to a predetermined algebraic function, while a feedback correction signal is calculated on the basis... | 03/09/1982 |
