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| Number | Title | Issue Date |
| 7901190 | Pump control system A pumping system in which a pump (5) is controlled by a programmed controller (22) in response to input signals from an inlet pressure transducer (3) and an outlet pressure transducer (15) and in certain circumstances inputs from various ... | 03/08/2011 |
| 7547196 | Method for mitigating rod float in rod pumped wells Rod Float Mitigation (RFM) methods for rod-pumped oil wells having a variable frequency drive which controls the speed of the motor for the pump. Each method monitors rod loads or a similar condition and takes action only when rod load drops below a predefined minim... | 06/16/2009 |
| 7442012 | Speed control for compressors Improvements to a compressor which consists in that, as soon as the measured outlet temperature (TO) reaches a certain hysteresis upper temperature limit (HMAX), the actual rotational speed of the compressor element is either lowered with a speed jump (DS) when the ... | 10/28/2008 |
| 7412841 | Turbo chiller, compressor therefor, and control method therefor A compressor for a turbo chiller that can stably and efficiently operate in various operating states is provided. An aerodynamic feature map showing a rotating stall line at which rotating stall occurs is provided on a map represented by a flow parameter reflecting ... | 08/19/2008 |
| 7387498 | System and method for noise attenuation of screw compressors A system is provided for attenuating noise in at least two positive displacement compressors proximately located from each other for use with at least one heating or cooling system. A lead compressor and a lag compressor have a selectably controllable rotational spe... | 06/17/2008 |
| 7372221 | Device for adjusting the armature stroke in a reversible linear drive unit A device for adjusting the armature stroke in a reversible linear drive unit comprising an excitation coil and an armature displaceable in the magnetic field of the excitation coil according to a linear oscillating motion at a predefined armature stroke. The device ... | 05/13/2008 |
| 7373208 | Control apparatus and control method Each of controllers includes: a transistor; a data processor for executing predetermined data processing and turning the transistor on or off in accordance with the data processing result; a pull-up resistor connected to an output terminal of the transistor; and a l... | 05/13/2008 |
| 7314349 | Fluid level control system for progressive cavity pump A control system controls a progressive cavity pump driven by a rod. The rod is powered by a prime mover, such as a variable speed drive. A proximity sensor outputs signals responsive to rotational positioning of the rod. A controller receives the signals and comput... | 01/01/2008 |
| 7299944 | Fluid dispenser calibration system and method A system and method for calibrating fluid detects an actual fluid dispensing characteristic, such as dispensing speed, and automatically adjusts the dispensing characteristic to match an ideal dispensing characteristic. The adjustment is conducted by a controller th... | 11/27/2007 |
| 7281903 | Device for varying the pressure of the fluid delivered by a jet washer Device for varying the delivery pressure of a jet washer comprising a positive-displacement pump operated by a single-phase electric motor powered by alternating current and having a delivery nozzle of predetermined cross-section, and electronic means for controllin... | 10/16/2007 |
| 7278329 | Chromatography system with blockage determination There is provided a method that includes, (a) monitoring a pressure on a fluid being conveyed through an intake tube into a chamber by a pump, (b) determining a deviation of the pressure from a predefined value, (c) determining a blockage of the intake tube based on... | 10/09/2007 |
| 7275916 | Integrated engine/compressor control for gas transmission compressors A method and system for controlling an engine that drives a reciprocating compressor, such as the large compressors used for natural gas transmission. A controller receives data from the compressor representing operation conditions, such as load step, suction pressu... | 10/02/2007 |
| 7273052 | Pneumatic sealing system for protection masks A pneumatic sealing system for a gas mask, which seals the mask to the face of the user by using a pump that employs air from inside the gas mask to variably inflate a mask seal during the breathing cycle. A double diaphragm pump, which has a driving diaphragm and a... | 09/25/2007 |
| 7243011 | Hybrid transmission launch algorithm A launch system for a hybrid vehicle includes a pump, an electronic throttle, a sensor, and a hybrid control module. The pump is driven by an internal combustion engine and provides pressurized fluid to a transmission. The electronic throttle selectively adjusts air... | 07/10/2007 |
| 7219723 | Integrated control system for beam pump systems The present invention generally provides apparatus and methods of operating a pumping system. The pump control apparatus includes a first sensor for measuring strain on a structure of the well pumping system and a second sensor for measuring a position of the struct... | 05/22/2007 |
| 7211977 | Pulse width modulation fan control In one embodiment, a fan control system includes a temperature-sensing device that is adapted to sense a temperature of a component and output a temperature feedback signal, and a pulse width modulation control circuit that is configured to receive the temperature f... | 05/01/2007 |
| 7197878 | Pump control system A pump control system (20) for a pump (21) in a gas turbine engine (10) is described. The pump control system (20) comprises demand means (22) for providing a demand signal (23) relating to a required rate of fluid flow and/... | 04/03/2007 |
| 7173399 | Integrated torsional mode damping system and method An integrated torsional mode damping method for a current source converter, including a rectifier, an inverter, and a DC link inductor coupled between the rectifier and the inverter, includes sensing a signal representative of torque on a shaft coupled to the invert... | 02/06/2007 |
| 7168636 | Apparatus, method and system for applying substances to forage, grain, and harvested crops An apparatus, method and system for applying a biologically active or chemical substance to a relatively large volume harvested or pre-harvested crop includes relatively small container of a mixture biologically active or chemical substance and water in fluid commun... | 01/30/2007 |
| 7163380 | Control of fluid flow in the processing of an object with a fluid An apparatus for and methods of control of a fluid flow. In a system for supercritical processing of an object, the apparatus includes a measuring device for measuring a pump performance parameter and a controller for adjusting a fluid flow in response to the perfor... | 01/16/2007 |
| 7163379 | Gradient liquid feed pump system, and liquid chromatograph A gradient liquid feed pump system capable of liquid feed in a correct mixing ratio even in the case of liquid feed in which the mixing ratio varies. Specifically, it comprises a first plunger pump for sucking and delivering an eluate, a second the first and second ... | 01/16/2007 |
| 7156095 | Hybrid microprocessor controlled ventilator unit A method and apparatus for operating a ventilator in a primary electronic mode or in a back-up pneumatic mode during primary electronic mode failure. A method and apparatus for operating a ventilator in an advanced mode, having a number of ventilatory modes, or in a... | 01/02/2007 |
| 7143016 | System and method for dynamic multi-objective optimization of pumping system operation and diagnostics Control systems and methodologies are disclosed for controlling a process having one or more motorized pumps and an associated motor drives, which comprise selecting a desired operating point within an allowable range of operation about a process setpoint according ... | 11/28/2006 |
| 7098617 | Advanced programmable closed loop fan control method A fan control system and method that maintains the operating temperature of computer and electronic devices or components at about a predetermined control level to minimize power consumption and audible noise. The fan control system is a programmable closed loop sys... | 08/29/2006 |
| 7083391 | Method and device for detecting the speed of a pump A method and a system for detecting the speed of a pump motor of a hydraulic pump system are provided, in which pump system a pump is driven by a pump motor to deliver hydraulic fluid into a pump reservoir. In accordance with the present invention, a pressure signal... | 08/01/2006 |
| 7044714 | System and method for controlling pumping of non-homogenous fluids A controller for controlling the pump unit of an oil well includes a sensor having a first and second probe for placement in the flow of oil from the well bore. Each of the probes contains a heater. A constant power source is selectively connected to one of the heat... | 05/16/2006 |
| 7038408 | Fan motor speed control circuit A fan motor speed control circuit includes a driving circuit, a voltage division circuit, and a speed modulator. The voltage division circuit has a first transistor and a plurality of resistors and is connected between a voltage source and the driving circuit. The s... | 05/02/2006 |
| 7037081 | High pressure reciprocating pump and control of the same Pumping requirements for chromatograph applications are for constant flow at high and variable pressures and for accurate programmable control of liquid composition. A two-cylinder pump, pumping system, and associated controls provide an accurate, fixed flow rate. A... | 05/02/2006 |
| 7032589 | Portable ventilator A portable ventilator for providing an air-recipient with compulsory respiration is provided with an outlet manifold and a single-expansion-chamber muffler configured so that airflow through an inhale outlet port of the muffler is pulse-free and a transmission loss,... | 04/25/2006 |
| 7032659 | Integrated control system for beam pump systems The present invention generally provides apparatus and methods of operating a pumping system. The pump control apparatus includes a first sensor for measuring strain on a structure of the well pumping system and a second sensor for measuring a position of the struct... | 04/25/2006 |
| 7033147 | Centrifugal fluid pump assembly with flow rate calculating section A centrifugal fluid pump assembly includes a body section and a control mechanism 6. The body section includes a housing, an impeller rotatable within the housing, and a motor for rotating the impeller. The pump assembly includes a motor current flow rate-related da... | 04/25/2006 |
| 6997683 | High pressure reciprocating pump and control of the same Pumping for chromatograph applications calls for constant flow at high pressures and for accurate control of liquid composition. A two-cylinder pump, and associated controls provide an accurate, fixed flow rate. During the initial portion of the pumping stroke of a ... | 02/14/2006 |
| 6962050 | Hybrid machine with hydraulic drive device A hybrid machine with a hydraulic drive device having hydraulic actuators allowed to operate against and by external loads is provided. To this end, the hybrid machine comprises hydraulic cylinders (7), first hydraulic pumps (P1) connected, with closed... | 11/08/2005 |
| 6957604 | Axial-piston drive system with a continuously adjustable piston stroke The invention relates to an axial piston drive with a continuously adjustable piston stroke, which comprises a drive shaft (10, 12) on which a swash plate (16) is supported in a crank chamber (14) in such a way as to be tiltable and displaceable... | 10/25/2005 |
| 6932696 | Cooling system including redundant fan controllers A cooling system including redundant fan controllers. The cooling system includes a first fan controller coupled to control a first plurality of fans and a second fan controller coupled to control a second plurality of fans. During operation, the first plurality of ... | 08/23/2005 |
| 6824362 | Fan control system A fan control system uses a closed loop system to adjust the actual operating speed of a fan or fans to a desired operating speed. The desired speed and actual speed are compared in a high gain amplifier to generate a control signal to adjust the actual operating sp... | 11/30/2004 |
| 6779981 | Fan control system using a microcontroller A fan control system. The fan motor is operated normally at not greater than a preset maximum rotation speed. The fan control system has a programmable microcontroller to receive an input voltage and a rotation speed signal corresponding to the actual rotation speed... | 08/24/2004 |
| 6776584 | Method for determining a centrifugal pump operating state without using traditional measurement sensors A method for determining whether a centrifugal pump is operating within its normal flow operating range includes the steps: of determining a motor torque/TDH relationship over a range of speeds for a minimum flow rate in order to obtain a minimum flow operating rang... | 08/17/2004 |
| 6758655 | Process for determining a reference characteristic for controlling a pump In the process according to the invention for determining a nominal values curve of an installation (Hinstallation(Q), Pinstallation(Q)) for controlling the pump capacity of a pump (6) driven by an electric motor (10) with speed c... | 07/06/2004 |
| 6741056 | Air sampler with compensating pump motor speed A constant flow of air through a personal air sampler is provided regardless of changes in the air flow path, by altering the pump speed as a function of the power taken by the pump. The characteristics of the pump are precalibrated to provide a constant used togeth... | 05/25/2004 |
