By Electrical Control Circuit Patents (Class 431/78)
  • Patent number: 10197276
    Abstract: A burner with a flame detector is provided. An atomizing chamber has an aperture. A flame tube is in front of the atomizing chamber, adapted to direct combusting fuel introduced by the atomizing chamber along an interior of the flame tube. A photodiode circuit is located behind the atomizing chamber. A filter is adapted to filter out signals from the photodiode outside of a predetermined bandwidth. Light from combusting fuel in the flame tube reaches the photodiode through the aperture. The output of the filter indicates the presence or absence of the flame in the flame tube based on at least whether enough light received and converted by the photodiode has a flicker rate within the predetermined bandwidth.
    Type: Grant
    Filed: January 5, 2017
    Date of Patent: February 5, 2019
    Assignee: BABINGTON TECHNOLOGY, INC.
    Inventors: Andrew D. Babington, Juan Carlos Lemus, Nigel Jones, Robert L. Babington, Robert S. Babington
  • Patent number: 9664386
    Abstract: In an embodiment, a combustion system includes a burner, a flame charging device, and a flame control system. The burner outputs a flow including fuel that when ignited generates a flame. The flame charging device is positioned adjacent to the flame and charges the flame to generate a charged flame. The control system includes one or more electrodes disposed adjacent to the charged flame, a charge managing module operatively coupled to the one or more electrodes, one or more sensors in electrical communication to the controller, and a controller in electrical communication with the charge managing module and the one or more sensors. The charge managing module controls charging and discharging of the electrodes. The sensors are positioned and configured to measure at least one combustion parameter of the charged flame. The controller controls operation of the charge managing module responsive to the at least one combustion parameter measured by the sensors.
    Type: Grant
    Filed: March 3, 2014
    Date of Patent: May 30, 2017
    Assignee: CLEARSIGN COMBUSTION CORPORATION
    Inventor: Igor A. Krichtafovitch
  • Patent number: 9651512
    Abstract: A device, a method, and a use thereof for detecting a concentration of a gas or of a gas component. The device as a gas sensor includes at least one sensor element including a gas-sensitive layer and a heating element for heating the gas-sensitive layer. The heating element is able to heat the sensitive layer to a desired temperature prior to the detection and/or is able to maintain it at a desired temperature during the detection. The heating element allows the gas-sensitive layer to be outgassed if needed, so as to allow absorption again. To heat the heating element, there is a first contacting to which a first voltage may be applied. Moreover, subsequent to the heating step, a second voltage may be applied to the sensor element or to the gas-sensitive layer for measured value detection with the aid of a second contacting.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: May 16, 2017
    Assignee: ROBERT BOSCH GMBH
    Inventors: Richard Fix, Denis Kunz, Philipp Nolte, Katrin Luckert
  • Patent number: 8997731
    Abstract: The invention relates to a gas burner for a gas cooking appliance with at least one gas hob and/or one gas oven, wherein the gas burner (10) comprises a heat source (18) and an electric ignition system (24), and wherein an electric or electronic control circuit (38) is provided for controlling the electric ignition system (24). According to the invention the gas burner (10) includes a photovoltaic generator (20) for generating the electric power for the electric ignition system (24).
    Type: Grant
    Filed: April 16, 2008
    Date of Patent: April 7, 2015
    Assignee: Electrolux Home Products Corporation N.V.
    Inventors: Karl Leidig, Francesco Corleoni, Edi Fabbro, Giancarlo Arrigoni
  • Patent number: 8956152
    Abstract: A fuel-fired water heater is shut down when a predicted steady state combustion chamber temperature is below a known threshold. The predicted steady state temperature is based on combustion chamber temperatures during heat up of the burner and appliance.
    Type: Grant
    Filed: November 20, 2012
    Date of Patent: February 17, 2015
    Assignee: Beckett Gas, Inc.
    Inventor: Richard D. Cook
  • Patent number: 8836522
    Abstract: A safety shut-off system and method for eliminating power to a load in the event of smoke detection. The system may comprise a device located at the appliance for detecting a signal from a smoke detector, and cutting power to the appliance only when the appliance is in use. The device may be synchronized with any standard smoke alarm signal to reduce the number of false positive shut-offs. The system may also comprise a smoke alarm hard-wired to a circuit breaker, for shutting off power to all appliances on a particular breaker upon receipt of a signal from the smoke alarm, and only when the appliances on the breaker are in use. The system may also have the ability to shut off one breaker, multiple breakers, or all breakers at different time increments to actively prevent and reduce the damages caused by fires.
    Type: Grant
    Filed: September 4, 2012
    Date of Patent: September 16, 2014
    Assignee: Fire Avert, LLC
    Inventors: Peter Thorpe, Michael Sanders, Chase Roberts, Kevin Sanders, Zack Bomsta
  • Patent number: 8747103
    Abstract: Apparatus for sensing the presence of a flame issuing from the flow of fuel through an elongate oven burner comprises an electrical current sensor immersed in a flame having carbon atoms which support such current. The fuel is ignited by a spark igniter. Should no flame exist after a predetermined time interval, or if the flame is extinguished, the supply of fuel to such burner is terminated and the spark igniter is disabled.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: June 10, 2014
    Inventor: James A. Glidden
  • Patent number: 8662885
    Abstract: A furnace system that generates heat by combustion is provided. The furnace system includes a sensor (100) that detects a gas concentration. The sensor is in communication with the flue gas (15). A controller is in communication with the sensor. The controller monitors the gas concentration and acts to control or deactivate the furnace.
    Type: Grant
    Filed: October 30, 2006
    Date of Patent: March 4, 2014
    Assignee: Carrier Corporation
    Inventors: Marc W. Roland, Hall Virgil
  • Patent number: 8636502
    Abstract: A control system for a fuel-fired appliance and methods of operating are disclosed. When a failed ignition of a burner is detected, the control system is configured to enter a soft lockout state if the voltage level of a burner of the fuel-fired appliance is low during the failed ignition and a hard lockout state if the voltage level of the burner is not low during the failed ignition. In some cases, if a period of time has elapsed and/or the voltage level of the burner has increased after the control system enters the soft lockout state, the control system may be configured to initiate one or more subsequent ignition trials. In some cases, if the one or more subsequent ignition trials fail, the control system may be configured to then enter the hard lockout state.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: January 28, 2014
    Assignee: Honeywell International Inc.
    Inventor: Peter Anderson
  • Patent number: 8512034
    Abstract: A pilot burner assembly for easy removal of a thermo-electric or other device is disclosed. In an illustrative embodiment, a burner tube, thermo-electric device, and/or spark source are retained in a desired position via a bracket and resilient clip. The bracket may include retention features built into the bracket to help aid in the positioning of the burner tube, thermo-electric device, and/or spark source. The burner tube, thermo-electric device and/or spark source may include retention features that are configured to engage corresponding retention features in the bracket, when desired. The resilient clip may bias the retention features of the burner tube, thermo-electric device and/or spark source against corresponding the retention features of the bracket.
    Type: Grant
    Filed: August 24, 2009
    Date of Patent: August 20, 2013
    Assignee: Honeywell International Inc.
    Inventors: Gregory Young, Donald J. Kasprzyk
  • Publication number: 20120288806
    Abstract: A flame sense circuit for a gas burner control employs a flame rod for flame rectification. An AC source applies an AC wave through a capacitor to the flame rod, and the flame rod is also connected via a resistive voltage divider to a DC voltage source. A voltage divider node is connected to a voltage follower, which impedance-matches an ADC input of a microprocessor controller. The flame sense circuit senses conditions of no-flame, and flame rod in contact with or leaking to ground, and when flame is present can quantify sensed flame as good, weak and marginal.
    Type: Application
    Filed: May 10, 2011
    Publication date: November 15, 2012
    Inventor: Bashkim Racaj
  • Patent number: 8272376
    Abstract: A gas cooker control system includes an ignition controller including a touch button, a resistor, a first comparator, a second comparator and a third comparator, one end of the touch button connected to external power source, and the other end connected to first inputs of the first, second and third comparators, the resistor being connected between the inputs of the first, second and third comparators and ground, outputs of the first, second and third comparators being connected to an igniter, a gas valve and a system power source; a gas valve controller including a switch circuit connected to a power source, at least one gas valve circuit connected between the switch circuit and ground, and a protection circuit parallel to the at least on gas valve circuit; and a power and ignition controller driving device including a power source driving circuit, an ignition driving circuit and a comparison circuit.
    Type: Grant
    Filed: April 25, 2008
    Date of Patent: September 25, 2012
    Assignee: Shenzhen H & T Intelligent Control Co., Ltd.
    Inventors: Fei Ma, Fujun Cao, Jianwei Liu, Zhaobing Shou
  • Publication number: 20120208132
    Abstract: A control system for a fuel-fired appliance and methods of operating are disclosed. When a failed ignition of a burner is detected, the control system is configured to enter a soft lockout state if the voltage level of a burner of the fuel-fired appliance is low during the failed ignition and a hard lockout state if the voltage level of the burner is not low during the failed ignition. In some cases, if a period of time has elapsed and/or the voltage level of the burner has increased after the control system enters the soft lockout state, the control system may be configured to initiate one or more subsequent ignition trials. In some cases, if the one or more subsequent ignition trials fail, the control system may be configured to then enter the hard lockout state.
    Type: Application
    Filed: April 26, 2012
    Publication date: August 16, 2012
    Applicant: HONEYWELL INTERNATIONAL INC.
    Inventor: Peter Anderson
  • Publication number: 20120156628
    Abstract: A control facility is provided for a burner system having a burner, actuators with which the supply of fuel and air to the burner is set, and an ionization electrode arranged in the flame zone. The control facility is equipped with a flame amplifier at the ionization electrode to generate an ionization signal and a positioning facility which, in control operation, positions a first actuator and regulates a second actuator by using a corresponding target value for the ionization signal. The positioning facility carries out a control operation in a first test step, it shifts the actuators toward a supply ratio corresponding to an air coefficient above the stoichiometric value of ?=1 and in so doing captures the ionization signal in a second test step, and it calculates a target value from this and from stored data in a third test step. Correction of drift therefore takes place.
    Type: Application
    Filed: December 16, 2011
    Publication date: June 21, 2012
    Applicant: SIEMENS AKTIENGESELLSCHAFT
    Inventors: RAINER LOCHSCHMIED, BERND SCHMIEDERER
  • Patent number: 8177544
    Abstract: A control system for a fuel-fired appliance and methods of operating are disclosed. When a failed ignition of a burner is detected, the control system is configured to enter a soft lockout state if the voltage level of a burner of the fuel-fired appliance is low during the failed ignition and a hard lockout state if the voltage level of the burner is not low during the failed ignition. In some cases, if a period of time has elapsed and/or the voltage level of the burner has increased after the control system enters the soft lockout state, the control system may be configured to initiate one or more subsequent ignition trials. In some cases, if the one or more subsequent ignition trials fail, the control system may be configured to then enter the hard lockout state.
    Type: Grant
    Filed: April 9, 2010
    Date of Patent: May 15, 2012
    Assignee: Honeywell International Inc.
    Inventor: Peter Anderson
  • Publication number: 20120100492
    Abstract: A lockout control system for a cooktop appliance having a surface heating unit includes a controller coupled to the cooktop, a lockout device coupled to the controller, a surface burner state switch coupled between the controller and the lockout device, the surface burner state switch configured to prevent operation of the lockout device when the surface heating unit is enabled.
    Type: Application
    Filed: October 25, 2010
    Publication date: April 26, 2012
    Inventors: Leo Edward Hodapp, JR., Michael Bernard Hitchcock, William Lee Holbrook
  • Publication number: 20120052454
    Abstract: An ignition system for a gas furnace being controlled by a main controller and having at least one burner is provided. The ignition system may include at least one flame sensor and an interface module. The flame sensor may be disposed in close proximity to the burner and configured to output a flame check signal indicative of a status of a flame at the burner. The interface module may be configured to receive the flame check signal and generate a fault check signal based on the flame check signal.
    Type: Application
    Filed: August 24, 2011
    Publication date: March 1, 2012
    Applicant: Carrier Corporation
    Inventors: William J. Roy, Kevin D. Thompson, Gary D. Wedlake
  • Publication number: 20110250548
    Abstract: A control system for a fuel-fired appliance and methods of operating are disclosed. When a failed ignition of a burner is detected, the control system is configured to enter a soft lockout state if the voltage level of a burner of the fuel-fired appliance is low during the failed ignition and a hard lockout state if the voltage level of the burner is not low during the failed ignition. In some cases, if a period of time has elapsed and/or the voltage level of the burner has increased after the control system enters the soft lockout state, the control system may be configured to initiate one or more subsequent ignition trials. In some cases, if the one or more subsequent ignition trials fail, the control system may be configured to then enter the hard lockout state.
    Type: Application
    Filed: April 9, 2010
    Publication date: October 13, 2011
    Applicant: HONEYWELL INTERNATIONAL INC.
    Inventor: Peter Anderson
  • Patent number: 7927095
    Abstract: A time-varying voltage is applied to an electrode, or a pair of electrodes, of a sensor installed in a fuel nozzle disposed adjacent the combustion zone of a continuous combustion system, such as of the gas turbine engine type. The time-varying voltage induces a time-varying current in the flame which is measured and used to determine flame capacitance using AC electrical circuit analysis. Flame capacitance is used to accurately determine the position of the flame from the sensor and the fuel/air ratio. The fuel and/or air flow rate (s) is/are then adjusted to provide reduced flame instability problems such as flashback, combustion dynamics and lean blowout, as well as reduced emissions. The time-varying voltage may be an alternating voltage and the time-varying current may be an alternating current.
    Type: Grant
    Filed: September 30, 2007
    Date of Patent: April 19, 2011
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Benjamin T. Chorpening, Jimmy D. Thornton, E. David Huckaby, William Fincham
  • Patent number: 7901203
    Abstract: A combustion chamber (1), in particular in a gas turbine, has at least two burners (A-H) that are connected to a fuel supply (3) via controllable fuel valves (2? and 2). Each burner (A to H) is assigned at least one optical measuring device (4) for detecting chemiluminescent radiation, and the combustion chamber (1) is assigned a pressure sensor (7) for detecting a combustion chamber pressure. The optical measuring device (4) and the pressure sensor (7) are connected to a computing and control device, which calculates a correlation value from the incoming measured values. A high correlation value signifies that the associated burner is prone to pulsation. The computing and control device (6) is designed in such a way that it determines the burner or a burner group with the highest correlation and controls the associated fuel valve(s) in such a way that more fuel is fed to the respective burner or the respective burner group, and the pulsation tendency thereof is thereby reduced.
    Type: Grant
    Filed: February 20, 2007
    Date of Patent: March 8, 2011
    Assignee: ALSTOM Technology Ltd.
    Inventors: Alexander Ni, Valter Bellucci, Peter Flohr, Bruno Schuermans, Majed Toqan, Ken-Yves Haffner
  • Publication number: 20100291494
    Abstract: A flame rod analysis system, methods for determining a condition of a flame and a flame rod, and circuits for determining a condition of a flame and a flame rod. The flame rod analysis system comprises energy storage connectable to a flame rod, a pulsed source connected to the energy storage and providing a voltage pulse or a current pulse, and a buffer to allow a processor to measure a buffered voltage at various time points. Flame rod analysis systems can distinguish between various flame conditions (no flame, low flame, etc.) while simultaneously characterizing the condition of the flame rod (shorted to ground, contaminated, etc.). Some flame rod analysis systems can directly measure the resistance of the flame rod.
    Type: Application
    Filed: May 15, 2009
    Publication date: November 18, 2010
    Inventors: Brian T. Branecky, Brian C. Dolder, Charles J. Koehler, III
  • Patent number: 7806682
    Abstract: Contamination rate reduction for a flame detection or sensor arrangement using controlled but flexible flame sensor activation. A flame sensor of the subject application is subject to contamination which reduces the lifetime of the sensor. To reduce a contamination rate of the flame sensor, the sensor may be inactivated for certain periods of time when the necessity of flame detection does not appear significant for the use at hand.
    Type: Grant
    Filed: February 20, 2006
    Date of Patent: October 5, 2010
    Assignee: Honeywell International Inc.
    Inventor: Victor J. Cueva
  • Publication number: 20100196834
    Abstract: Apparatus for sensing the presence of a flame issuing from the flow of fuel through an elongate oven burner comprises an electrical current sensor immersed in a flame having carbon atoms which support such current. The fuel is ignited by a spark igniter. Should no flame exist after a predetermined time interval, or if the flame is extinguished, the supply of fuel to such burner is terminated and the spark igniter is disabled.
    Type: Application
    Filed: October 2, 2009
    Publication date: August 5, 2010
    Inventor: James A. Glidden
  • Patent number: 7695273
    Abstract: A furnace system responsive to a thermostat includes a pollutant sensor for sensing a pollutant concentration in the furnace system. The pollutant sensor is configured to open when the pollutant concentration reaches a pollutant threshold and close when the pollutant concentration falls below the pollutant threshold. When the thermostat is calling for heat, a furnace controller monitors the pollutant sensor and disables the furnace system for a lockout period if a lockout criterion related to the pollutant sensor is met.
    Type: Grant
    Filed: October 4, 2006
    Date of Patent: April 13, 2010
    Assignee: United Technologies Corporation
    Inventor: Daniel J. Dempsey
  • Publication number: 20100009304
    Abstract: A furnace system that generates heat by combustion is provided. The furnace system includes a sensor (100) that detects a gas concentration. The sensor is in communication with the flue gas (15). A controller is in communication with the sensor. The controller monitors the gas concentration and acts to control or deactivate the furnace.
    Type: Application
    Filed: October 30, 2006
    Publication date: January 14, 2010
    Applicant: CARRIER CORPORATION
    Inventors: Marc W. Roland, Hall Virgil
  • Publication number: 20090253087
    Abstract: A control for controlling the operation of a fuel-fired heating appliance is provided that include a sensor capable of sensing the presence of carbon monoxide gas and providing an output indicative of the level of carbon monoxide gas. The control further includes a microprocessor that periodically reads the CO sensor output and stores at least one sensor output value in a memory, wherein the microprocessor responsively discontinues the operation of the appliance when the microprocessor detects a sensor output that has increased by more than a predetermined amount over at least one previously stored sensor output value. In one embodiment, the control is preferably configured to periodically read the sensor output value, and responsive discontinue operation of an appliance upon sensing a predetermined increase of at least a 50 percent increase over the previously monitored sensor output value over a period of about 15 to 90 minutes.
    Type: Application
    Filed: June 16, 2009
    Publication date: October 8, 2009
    Inventors: Donald E. Donnelly, Thomas J. Fredricks
  • Publication number: 20080070170
    Abstract: A safety valve supply circuit for the ignition of a gas burner is disclosed. Said safety valve is directly supplied by a flame-detecting thermocouple, and said supply circuit comprises a supply capacitor that is charged from an alternating mains voltage, obtaining from the energy accumulated in said supply capacitor, due to said charging, an input voltage signal that is used to temporarily supply said safety valve in order to maintain it open. Said charging of the supply capacitor is carried out by momentarily activating a supply switch to temporarily connect said supply capacitor to said alternating mains voltage, said supply switch activation occurring concurrently with the activation of the gas burner. Said supply circuit also comprises conditioning means for converting said input voltage signal into an output voltage signal that is directly applied to said safety valve to supply it, and so maintain it open.
    Type: Application
    Filed: August 4, 2006
    Publication date: March 20, 2008
    Inventors: Jose Maria Mitxelena, Jokin Mujika, Jose Maria Lasa
  • Patent number: 7255100
    Abstract: An electronically activated gas cooktop control system, responsive to a touch-sensitive user interface, and capable of providing a predetermined range of cooking and simmer levels of BTU output, has two complementary heating modes of operation A first heating mode of operation is provided to produce a wide selection of simmer levels of BTU output, by electronically sequencing a solenoid-operated modulating gas valve “on” and “off”, at a predetermined level of flame. A second cooking mode of operation is provided by electronically modulating the level of flame, through use of a pulse-width-modulation (PWM) output signal to produce a wide selection of cooking levels of BTU output. An igniter system capable of insuring proper ignition of gas without generating harmful electromagnetic interference is also provided.
    Type: Grant
    Filed: June 18, 2001
    Date of Patent: August 14, 2007
    Assignee: CompuValve LLC
    Inventors: Pierre P. Repper, Alan B. Shute, Christa B. Shute, Suzanne J. Shute, Allen L. Olson, Feng Zhou
  • Patent number: 7241135
    Abstract: A modulating gas burner control system using closed loop feedback from a flame rod which provides a signal that varies with gas pressure and which provides combustion air fan control to accurately control the heat from the system without use of expensive control valves.
    Type: Grant
    Filed: November 18, 2004
    Date of Patent: July 10, 2007
    Assignee: Honeywell International Inc.
    Inventors: Sybrandus Munsterhuis, Rolf L. Strand
  • Patent number: 7123020
    Abstract: A fault detection system and method for a warm air furnace is provided. A sensing circuit connected to an AC power source measures a level of current consumption during several points in the warm air furnace operating sequence. The measured level of current consumption is compared with an expected value. If the measured level exceeds the expected level by a threshold amount, a fault in the warm air furnace may be detected. An indication of at least one warm air furnace component that is most likely to have caused the fault may be provided.
    Type: Grant
    Filed: June 28, 2004
    Date of Patent: October 17, 2006
    Assignee: Honeywell international Inc.
    Inventors: Bruce L. Hill, Rolf L. Strand, Michael W. Schultz
  • Patent number: 7051683
    Abstract: A method, and a system using the method, of controlling a heating device. The method includes combusting a mixture of fuel and air in a sealed combustion chamber thereby forming a reaction zone in which the fuel reacts with the air, and also forming outside of the reaction zone an ion zone in which ions are formed as a result of combustion. The method also includes positioning an ion detecting member in the ion zone, and generating an electrical signal at the ion detecting member in response to an ion concentration in the ion zone. The method also includes detecting a direction reversal of the electrical signal at the ion detecting member, and stopping combusting the mixture in response to the reverse of the direction of the electrical signal.
    Type: Grant
    Filed: August 17, 2005
    Date of Patent: May 30, 2006
    Assignee: AOS Holding Company
    Inventors: Hyungsik Lee, Robert F. Poehlman, Jr.
  • Patent number: 6964248
    Abstract: A gas-fired water heater is provided with a combustion shutoff system which precludes further combustion within the water heater's combustion chamber in response to a combustion temperature therein reaching a predetermined level correlated to and indicative of a predetermined, undesirably high concentration of carbon monoxide present in the combustion chamber. In various illustrated embodiments thereof, the combustion shutoff system is operative to terminate further combustion air inflow to the combustion chamber, or terminate further fuel flow to the burner portion of the water heater.
    Type: Grant
    Filed: September 28, 2004
    Date of Patent: November 15, 2005
    Assignee: The Water Heater Industry Joint Research and Development Consortium
    Inventors: Gordon W. Stretch, Bruce A. Hotton, John H. Scanlon, Gary A. Elder, James T. Campbell, Larry D. Kidd, Eric M. Lannes, Garrett Doss, Michael W. Gordon, James M. Martin, James W. Mears, Thomas E. Archibald
  • Patent number: 6957628
    Abstract: A gas-fired water heater is provided with a combustion shutoff system which precludes further combustion within the water heater's combustion chamber in response to a combustion temperature therein reaching a predetermined level correlated to and indicative of a predetermined, undesirably high concentration of carbon monoxide present in the combustion chamber. In various illustrated embodiments thereof, the combustion shutoff system is operative to terminate further combustion air inflow to the combustion chamber, or terminate further fuel flow to the burner portion of the water heater.
    Type: Grant
    Filed: September 28, 2004
    Date of Patent: October 25, 2005
    Assignee: The Water Heater Industry Joint Research and Development Consortium
    Inventors: Gordon W. Stretch, Bruce A. Hotton, John H. Scanlon, Gary A. Elder, James T. Campbell, Larry D. Kidd, Eric M. Lannes, Garrett Doss, Michael W. Gordon
  • Patent number: 6953335
    Abstract: An apparatus for reducing nitrogen dioxide emissions in a flueless heating appliance or heater includes a heat-exchanger for exchanging heat contained in fumes produced by the combustion of a fuel in the heating appliance. A heating appliance or heater without a fume flue includes a burner supplied with a gaseous fuel, an evacuator for discharging into an environment outside the heater fumes produced by combustion of the fuel, and a heat-exchanger for receiving the fumes from the burner and sending them to the evacuator. A method for reducing nitrogen dioxide emissions in a flueless heating appliance, supplied with a gaseous fuel, includes removing heat in a controlled manner from fumes produced by the combustion of the fuel so as to minimize the conversion of NO into NO2 in the fumes.
    Type: Grant
    Filed: May 6, 2002
    Date of Patent: October 11, 2005
    Inventors: Giuseppe Fogliani, Enrica Baraldi, Gunther Berthold, Don Denton
  • Patent number: 6893253
    Abstract: A gas-fired water heater is provided with a combustion shutoff system which precludes further combustion within the water heater's combustion chamber in response to a combustion temperature therein reaching a predetermined level correlated to and indicative of a predetermined, undesirably high concentration of carbon monoxide present in the combustion chamber. In various illustrated embodiments thereof, the combustion shutoff system is operative to terminate further combustion air inflow to the combustion chamber, or terminate further fuel flow to the burner portion of the water heater.
    Type: Grant
    Filed: May 5, 2003
    Date of Patent: May 17, 2005
    Assignee: The Water Heater Industry Joint Research and Development Consortium
    Inventors: Gordon W. Stretch, Bruce A. Hotton, John H. Scanlon, Gary A. Elder, James T. Campbell, Larry D. Kidd, Eric M. Lannes, Garrett Doss, Michael W. Gordon, James M. Martin, James W. Mears, Thomas E. Archibald
  • Patent number: 6887069
    Abstract: The present invention is directed to an apparatus for the monitoring of the combustion process within a combustion system. The apparatus comprises; a combustion system, a means for supplying fuel and an oxidizer, a device for igniting the fuel and oxidizer in order to initiate combustion, and a sensor for determining the current conducted by the combustion process. The combustion system comprises a fuel nozzle and an outer shell attached to the combustion nozzle. The outer shell defines a combustion chamber. Preferably the nozzle is a lean premix fuel nozzle (LPN). Fuel and an oxidizer are provided to the fuel nozzle at separate rates. The fuel and oxidizer are ignited. A sensor positioned within the combustion system comprising at least two electrodes in spaced-apart relationship from one another. At least a portion of the combustion process or flame is between the first and second electrodes.
    Type: Grant
    Filed: September 18, 2001
    Date of Patent: May 3, 2005
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Jimmy D. Thornton, George A. Richards, Keith A. Dodrill, Roy S. Nutter, Jr., Douglas Straub
  • Patent number: 6851948
    Abstract: A gas furnace responsive to a thermostat includes a thermal switch wired in series between the furnace power supply and the thermostat. A microprocessor connected to the thermal switch detects when the switch opens and closes, carrying out prearranged programs in response thereto. The thermal switch is mounted so that it opens when an over-pressure in the furnace draft system is detected, as evidenced by hot flue gasses passing over the thermal switch probe. The switch is allowed to cycle at least one time before the furnace is disabled. After a certain period of the time, the combustion cycle is reinitiated and the above steps are repeated if the thermal switch again resets.
    Type: Grant
    Filed: March 13, 2003
    Date of Patent: February 8, 2005
    Assignee: Carrier Corporation
    Inventors: Daniel J. Dempsey, Michael L. Brown
  • Publication number: 20040033456
    Abstract: A device for increasing an extreme low voltage from a heat to electrical voltage thermopile is shown. The device has an oscillator including two MOSFET transistors coupled to a transformer having four bifilar windings wound on a core having a high permeability. The two transistors operate alternately to generate an intermediate voltage which is increased in magnitude by a voltage doubling and rectifying circuit to obtain the substantially constant operating output voltage. The output voltage is further maintain constant by a current control cirucit including an adjustable potentiometer adjustable to vary the current.
    Type: Application
    Filed: August 13, 2002
    Publication date: February 19, 2004
    Inventor: Reza H. Shah
  • Patent number: 6540505
    Abstract: A burner for liquid fuel has an electric heating device for start up heating a fuel vaporization chamber to a selected temperature, a flame retention baffle being fitted on the vaporization chamber with a temperature sensor sensing temperature of the vaporization. When the vaporization chamber is heated to a desired temperature of about 350 degrees celsius by deflected hot exhaust gas products from the burner operation and such temperature is sensed, the sensor outputs a signal so that the electric heating device can be shut down, vaporization chamber heating then being maintained by the deflected hot exhaust gas flow.
    Type: Grant
    Filed: March 1, 2001
    Date of Patent: April 1, 2003
    Assignee: Toby AG
    Inventors: Josef Wuest, Heinz Steiner
  • Patent number: 6537059
    Abstract: A regulating device for a burner regulates the air-gas ratio by way of an ionization electrode. In the event of dynamic changes in output preliminary control is implemented in accordance with the invention with two or more stored characteristics.
    Type: Grant
    Filed: May 7, 2001
    Date of Patent: March 25, 2003
    Assignee: Siemens Building Technologies AG
    Inventor: Rainer Lochschmied
  • Patent number: 6527541
    Abstract: During start-up a regulating device monitors the quality of the air ratio control in respect of time in accordance with the invention in that it observes the difference of a signal and comparison signal.
    Type: Grant
    Filed: August 24, 2001
    Date of Patent: March 4, 2003
    Assignee: Siemens Building Technologies AG
    Inventor: Rainer Lochschmied
  • Patent number: 6478573
    Abstract: An apparatus for and method of rapidly detecting a flame out condition. A thermopile receives heat energy from the flame and generates electrical power to enable operation of a microprocessor. This microprocessor periodically measures the output voltage of the thermopile at one second intervals. An average is taken of eight consecutive samples. A running history of eight averages is stored within a FIFO which serves as a history queue. This FIFO thus stores a digitized signature of the flame condition over the previous 64 seconds. Analysis by the microprocessor is able to make an early detection of the flame out condition be utilizing the current voltage measurement sand the FIFO contents.
    Type: Grant
    Filed: November 23, 1999
    Date of Patent: November 12, 2002
    Assignee: Honeywell International Inc.
    Inventor: Brent Chian
  • Patent number: 6429020
    Abstract: A sensor for detecting the flame occurring during a flashback condition in the fuel nozzle of a lean premix combustion system is presented. The sensor comprises an electrically isolated flashback detection electrode and a guard electrode, both of which generate electrical fields extending to the walls of the combustion chamber and to the walls of the fuel nozzle. The sensor is positioned on the fuel nozzle center body at a location proximate the entrance to the combustion chamber of the gas turbine combustion system. The sensor provides 360° detection of a flashback inside the fuel nozzle, by detecting the current conducted by the flame within a time frame that will prevent damage to the gas turbine combustion system caused by the flashback condition.
    Type: Grant
    Filed: June 2, 2000
    Date of Patent: August 6, 2002
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Jimmy Dean Thornton, George Alan Richards, Douglas L. Straub, Eric Arnold Liese, John Lee Trader, Jr., George Edward Fasching
  • Publication number: 20020073985
    Abstract: A cooking appliance with a cooktop including at least one gas burner includes a control for sequentially delivering gas and igniting the gas to burner ports. The control comprises a valve with a responsive element for controlling gas flow to the burner ports, an ignition module for generating a drive signal to an ignitor, an electronic controller interfacing with the ignition module and coupled to a driver for actuating a responsive element in the valve. The driver that causes displacement of the responsive element includes a pick up actuator enabling the responsive element to initiate a status that opens the passageway. The valve also includes a holding actuator that enables the responsive element to maintain the status of the passageway as open when flame is detected at the burner.
    Type: Application
    Filed: December 18, 2000
    Publication date: June 20, 2002
    Applicant: BSH Home Appliances Corporation
    Inventors: H. Alan Leukhardt, Dino S. Uy
  • Publication number: 20020048736
    Abstract: A conventional watchdog timer circuit is arranged to judge a microcomputer to be normal as long as a pulse signal is being outputted from the microcomputer. Therefore, an abnormal condition cannot be detected when an operating frequency of the microcomputer lowers, for example. As a solution, the watchdog timer circuit is provided with a function for detecting the frequency. If the frequency of the pulse signal deviates from a predetermined frequency range, a reset signal is outputted indicating that the microcomputer is abnormal, even if the pulse signal is being outputted. A solenoid-operated gate valve is thereby closed to stop the supply of gas to a gas burner.
    Type: Application
    Filed: July 18, 2001
    Publication date: April 25, 2002
    Applicant: RB Controls Co., Ltd.
    Inventors: Hajime Kawauchi, Toshihisa Terade
  • Publication number: 20020048737
    Abstract: During start-up a regulating device monitors the quality of the air ratio control in respect of time in accordance with the invention in that it observes the difference of a signal and comparison signal.
    Type: Application
    Filed: August 24, 2001
    Publication date: April 25, 2002
    Applicant: Siemens Building Technologies AG
    Inventor: Rainer Lochschmied
  • Patent number: 6354830
    Abstract: A first object of the invention is to provide a control circuit (1) for gas burners with a fail-safe system. The circuit (1) includes a microcontroller (2) that acts on at least one valve (4), flame detector circuits (50) and tap opening detector switches (6). For each valve (4) the circuit (1) has a plurality of switches by means of which these valves are supplied with the voltage required to open them and keep them open. The microcontroller (2) governs said switches in accordance with the signals it receives from the circuits (5), from the switches (6), and from points of the actual circuit (1). The circuit (1) is safe against the failure of any of its components, including the microcontroller (2). A second object of the invention is also to provide a circuit (1) that has protection against a double failure.
    Type: Grant
    Filed: July 21, 2000
    Date of Patent: March 12, 2002
    Assignee: Fagor, S. Coop.
    Inventor: Eduardo Beltran de Nanclares
  • Patent number: 6322352
    Abstract: A stove burner safety system has an electromagnetic valve and a manual gas cock controlling the gas flow to the burner and a spark plug adjacent the burner which receives a spark pulse from the electric circuitry which also controls an electromagnetic valve. When the stem of the manual valve is actuated a switch turns on the electric module and when a flame failure is detected a train of a certain number of spark pulses is supplied to the spark plug and if reignition does not occur within a certain number of pulse or a certain time, the electromagnetic valve is turned off.
    Type: Grant
    Filed: June 8, 1999
    Date of Patent: November 27, 2001
    Assignee: Isphording Germany GmbH
    Inventor: Robert Zink
  • Patent number: 6299433
    Abstract: A method and apparatus for controlling the operation of a burner apparatus are provided via the flame intensity of combustion reaction mixtures of oxidant and fuel gas.
    Type: Grant
    Filed: November 5, 1999
    Date of Patent: October 9, 2001
    Assignee: Gas Research Institute
    Inventors: Gautam Gauba, Charles Edward Benson, Johannes H. J. Thijssen, Stephan Erwin Schmidt, Scott MacAdam
  • Patent number: 6280180
    Abstract: A method and a system for igniting a gas burner of a gas stove is disclosed, which includes a spark generating circuit to produce sparks for igniting gas burners and a plurality of electrodes which are connected with the spark generating circuit for the ignition of the gas burners. A flame sensor circuit is operated in a first period for producing sparks, through of the electrodes, and in a second period and once the gas burner has been ignited, for sensing the presence of flame on each gas burner. A power source is connected for limiting the voltage to the flame sensor circuit.
    Type: Grant
    Filed: March 28, 2000
    Date of Patent: August 28, 2001
    Assignee: Vitromatic Comercial, S.A. DE C.V.
    Inventors: David H. Fredin-Garcia-Jurado, Alfonso Perez-Garcia