With Test Circuit Checking Or Analyzing Flame Sensing Circuit For Malfunction Patents (Class 431/24)
  • Patent number: 11365881
    Abstract: Burner (10), in particular for a vehicle heater (12), having an orifice plate (14) separating an inner combustion region (16) from an outer region (18), wherein a photosensitive sensor (20) is arranged in the outer region (18), wherein at least two separate air inlet openings (22, 24, 26, 28) are being provided in the orifice plate (14), wherein one of the at least two air inlet openings (22, 24, 26, 28) is additionally formed as a light opening (28) which also allows light to pass from the inner combustion region (16) to the photosensitive sensor (20) that is arranged in the outer region (18), wherein the at least two air inlet openings (22, 24, 26, 28) are being shaped such that the same combustion air quantities flow into the internal combustion region (16) per unit time, respectively, and wherein the orifice plate (14) is transparent and/or the light opening (28) has a shape different from the air inlet openings (22, 24, 26) that are not formed as light opening such that an illumination area defined by th
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: June 21, 2022
    Assignee: WEBASTO SE
    Inventors: Klaus Mösl, Björn Smigiel, Paul Leinsle, Vitali Dell, Matthias Pfau, Marcus Gowitzke
  • Patent number: 11225785
    Abstract: A sanitary washing device according to an embodiment comprises a heating part, a nozzle configured to jet water heated by the heating part toward human private parts; a controlling part configured to control at least one of the heating part and the nozzle, and a monitoring part. The monitoring part is configured to diagnose a failure of the controlling part and to prohibit at least one of heating in the heating part and jetting from the nozzle when the controlling part fails. The controlling part is configured to diagnose a failure of the monitoring part and to prohibit at least one of heating in the heating part and jetting from the nozzle when the monitoring part fails.
    Type: Grant
    Filed: September 17, 2018
    Date of Patent: January 18, 2022
    Assignee: TOTO LTD.
    Inventors: Munehiko Ogawa, Yasuhiro Matsuda, Kandai Kawahara, Haruhiko Fukumoto
  • Patent number: 11002452
    Abstract: A heat pump system includes a compressor, usage side heat exchanger, heat source side heat exchanger, expansion mechanism, main refrigerant flow control device switchable between cooling and heating modes, gas reheat heat exchanger connected in the refrigerant circuit, a fan disposed to direct an airflow across the usage side heat exchanger and the gas reheat heat exchanger into a target space, and a secondary refrigerant flow control device switchable between first and second modes. Refrigerant flows from the discharge line to the main refrigerant flow control device in the heating mode and the cooling mode in the first mode. Refrigerant flows from the discharge line to the gas reheat heat exchanger in a gas reheat mode and then flows to the main refrigerant flow control device in the second mode. A flow of the heat transfer medium to the heat source side heat exchanger is adjustable.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: May 11, 2021
    Assignee: DAIKIN APPLIED AMERICAS INC.
    Inventors: Marcos Locke, Benny DiMarco
  • Patent number: 10352588
    Abstract: A control system for controlling a gas powered appliance includes a hot surface igniter, an igniter relay, and an integrity detection circuit. The integrity detection circuit is configured to be coupled to a power source, the igniter relay, and the hot surface igniter to produce an output indicative of the integrity of the hot surface igniter and the igniter relay. The integrity detection circuit is configured to output a first voltage when the igniter relay is closed and output a second voltage different from the first voltage when the hot surface igniter is in a non-short circuit failure condition.
    Type: Grant
    Filed: April 26, 2016
    Date of Patent: July 16, 2019
    Assignee: Emerson Electric Co.
    Inventor: John Broker
  • Patent number: 9534782
    Abstract: A combustible fuel burner system includes a burner unit, a power source, and a circuit interrupter unit. The circuit interrupter unit has a switch electrically coupled between the power source and the burner unit. The switch has a closed state, wherein the burner unit receives operational electrical power from the power source. The switch moves from a closed state to an open state and electrically disconnects the device from the power source upon a voltage of the power source falling below an interruption threshold. The switch, when in the open state, moves to the closed state upon the voltage of the power source being above a restoration threshold that is higher than the interruption threshold.
    Type: Grant
    Filed: October 30, 2014
    Date of Patent: January 3, 2017
    Assignee: Falcon Road Maintenance Equipment
    Inventors: Michael J. Groulx, Thomas K. Klumpp
  • Patent number: 9170020
    Abstract: A monitoring device has a first flame detector, to receive a first batch of radiation, which is emitted by the first flame, a second flame detector, to receive a second batch of radiation, which is emitted by the second flame, a voltage supplying device to apply an alternating voltage with a first half wave and a second half wave to the two flame detectors and an evaluation circuit that is connected to the two flame detectors via a signal input. A first measurement signal that is present at the common signal input during the first half wave is indicative of the intensity of the first batch of radiation. A second measurement signal that is present at the common signal input during the second half wave is indicative of the intensity of the second batch of radiation. The evaluation circuit independently evaluates the first measurement signal and the second measurement signal.
    Type: Grant
    Filed: May 2, 2012
    Date of Patent: October 27, 2015
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Alexander Diebold, Ulrich Hofmann, Erik Lang, Josef Lelle
  • Patent number: 9019102
    Abstract: A service method of gas appliances includes: Detecting the gas appliances at the client ends to generate detecting signals. Transmitting the detecting signals to a service end. Identifying which client end the detecting signals come from. Examining the detecting signals to find whether the gas appliance has an abnormal condition; and informing the client end when the abnormal condition is found. After all, the service end may monitor the gas appliances at the client end, and inform the client for repair when the gas appliance has detected an abnormal signal or has damaged parts.
    Type: Grant
    Filed: May 16, 2013
    Date of Patent: April 28, 2015
    Assignee: Grand Mate Co., Ltd.
    Inventors: Chung-Chin Huang, Chin-Ying Huang, Hsin-Ming Huang, Hsing-Hsiung Huang
  • Patent number: 9011142
    Abstract: A system for providing a combined water and fire display is provided. More specifically, a decorative display comprises a dynamic water and fire display device where fuel/air, water, and fire are integrated. The decorative display provides for unique aesthetic qualities and an appearance wherein flames are positioned at or near the surface of a volume of water. In various embodiments, the decorative display further comprises various safety features including the ability to detect and self-regulate conditions such as the existence and/or absence of a pilot flame, an adequate amount of water, and the temperature of various portions of the system. The decorative display further contemplates the ability to operate without one or more disclosed features, such as when only a water display or only a fire display is desired.
    Type: Grant
    Filed: June 19, 2013
    Date of Patent: April 21, 2015
    Inventors: William L. Muff, Timothy C. Muff
  • Patent number: 8872658
    Abstract: A service method of gas appliances includes: Detecting the gas appliances at the client ends to generate detecting signals. Transmitting the detecting signals to a service end. Identifying which client end the detecting signals come from. Examining the detecting signals to find whether the gas appliance has an abnormal condition; and informing the client end when the abnormal condition is found. After all, the service end may monitor the gas appliances at the client end, and inform the client for repair when the gas appliance has detected an abnormal signal or has damaged parts.
    Type: Grant
    Filed: May 16, 2013
    Date of Patent: October 28, 2014
    Assignee: Grand Mate Co., Ltd.
    Inventors: Chung-Chin Huang, Chin-Ying Huang, Hsin-Ming Huang, Hsing-Hsiung Huang
  • Patent number: 8747102
    Abstract: An ignitor spark indicator 100 is described that monitors RF signals within a flame rod 25 located near a spark rod 23. The signal from the flame rod 25 is processed to provide a waveform that indicates when electrical arcing is occurring. The indication when arcing is occurring is also provided to flame-detecting equipment. The flame-proving device 60 only operates when the arcing is not produced so that the flame-detecting device 60 does not confuse the arcing with a flame reducing the false positive determinations.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: June 10, 2014
    Assignee: ALSTROM Technology Ltd
    Inventors: Stanley Joseph Boguszewski, Paul Herbert Chase
  • Publication number: 20140134548
    Abstract: Exemplary embodiments are disclosed of a climate control system that includes an igniter and a controller having an igniter relay. The controller senses a current level through the igniter and senses voltage between terminals of a second relay of the controller. In a given one of a plurality of operational phases of the system, the controller is configured to compare the sensed current level and sensed voltage to a current level and voltage associated with a specific condition of the igniter, igniter relay, or second relay in the given phase. Based on a result of the comparing, the controller is configured to distinguish between a failure of one of the relays and a failure of the igniter.
    Type: Application
    Filed: November 28, 2012
    Publication date: May 15, 2014
    Applicant: EMERSON ELECTRIC CO.
    Inventors: John F. Broker, John J. Heller
  • Patent number: 8659437
    Abstract: A flame sensing system having a flame rod, a signal generator, a signal measurement circuit, and a controller, where the frequency and/or amplitude of the excitation signal may be variable. The signal measurement circuit may include a bias circuitry that references the flame signal to a voltage, a capacitor that varies the filtration, an AC coupling capacitor, a current limiting resistor, and a low-pass filter. The system may determine the flame-sensing rod contamination, the stray capacitance of the flame sensing system, and compensate for stray capacitance in the flame sensing system. The flame model may include a circuit that simulates a flame in the presence of the sensing rod, and another circuit that simulates a contact surface between the flame and the sensing rod.
    Type: Grant
    Filed: July 6, 2010
    Date of Patent: February 25, 2014
    Assignee: Honeywell International Inc.
    Inventor: Brent Chian
  • Patent number: 8523560
    Abstract: A control system for a fuel-fired appliance and methods of operating are disclosed. In an illustrative embodiment, when an electrical characteristic of an optical detector, such as a resistance, does not change by at least a predetermined amount during an ignition trial, and/or when a level of EMI or electrical noise detected by an antenna in a burner assembly of the fuel-fired appliance does not increase during the ignition trial, the control system may determine that the ignition assembly is not sparking properly. In some instances, the control system may also be programmed to activate an indicator that would indicate to a user or technician a potential problem with the ignition assembly (e.g. not sparking properly to ignite fuel).
    Type: Grant
    Filed: April 9, 2010
    Date of Patent: September 3, 2013
    Assignee: Honeywell International Inc.
    Inventors: Peter Anderson, Jonathan McDonald, Peter Stolt, Henry E. Troost
  • Patent number: 8502688
    Abstract: The disclosure relates to a process of configuring a standalone self-supplied numeric controlled relay for providing phase and earth over current protection to electrical systems by accurate current measurement. The arrangement for current measurement with control algorithms is provided for power control by providing amplified and conditioned current for optimization between the current to power an electronic circuit and the fidelity of a measured current waveform so that they both are at the acceptable levels at the same time. This disclosure describes the current sensing and associated algorithm for power control in a truly self-powered relay.
    Type: Grant
    Filed: August 16, 2010
    Date of Patent: August 6, 2013
    Assignee: ABB Technology Ltd
    Inventors: Niraj Suthar, Vijay Shah, Maulik Vyas, Bernhard Deck
  • Patent number: 8469702
    Abstract: A system for providing a combined water and fire display is provided. More specifically, a decorative display comprises a dynamic water and fire display device where fuel/air, water, and fire are integrated. The decorative display provides for unique aesthetic qualities and an appearance wherein flames are positioned at or near the surface of a volume of water. In various embodiments, the decorative display further comprises various safety features including the ability to detect and self-regulate conditions such as the existence and/or absence of a pilot flame, an adequate amount of water, and the temperature of various portions of the system. The decorative display further contemplates the ability to operate without one or more disclosed features, such as when only a water display or only a fire display is desired.
    Type: Grant
    Filed: May 26, 2010
    Date of Patent: June 25, 2013
    Inventors: William H. Muff, Timothy C. Muff
  • Patent number: 8466787
    Abstract: A service method of gas appliances includes: Detecting the gas appliances at the client ends to generate detecting signals. Transmitting the detecting signals to a service end. Identifying which client end the detecting signals come from. Examining the detecting signals to find whether the gas appliance has an abnormal condition; and informing the client end when the abnormal condition is found. After all, the service end may monitor the gas appliances at the client end, and inform the client for repair when the gas appliance has detected an abnormal signal or has damaged parts.
    Type: Grant
    Filed: March 14, 2011
    Date of Patent: June 18, 2013
    Assignee: Grand Mate Co., Ltd.
    Inventors: Chung-Chin Huang, Chin-Ying Huang, Hsin-Ming Huang, Hsing-Hsiung Huang
  • Patent number: 8070482
    Abstract: A system of detection and analysis of gas or fuel oil flames using optical devices, consisting of a sensor that targets the flame's reaction zone through an optical access, a processing and control module, and an actuator, responsible for controlling the damper. The system optimizes combustion equipment operation by controlling the damper, obtaining better performance and reducing polluting emissions.
    Type: Grant
    Filed: June 16, 2008
    Date of Patent: December 6, 2011
    Assignees: Universidad de Concepción, Universidad de la Frontera, ANWO S.A
    Inventors: Oscar Francisco Farias Fuentes, Daniel Gerónimo Sbarbaro Hofer, Robinson Eugenio Betancourt Astete
  • Patent number: 8066508
    Abstract: A signal generation system for flame ignition and sensing. The ignition signal generation is adaptive for improving flame ignition while eliminating excess energy usage. High voltage signals for flame sensing may also be provided. If more energy or speed is needed for ignition signal generation, then the flame sensing signal generation portion may be disabled to increase the amount of available energy. Adaptation for ignition signal generation may be guided by the results of flame sensing. The flame sensing voltage may be regulated based on the flame current strength. The flame current may be controlled within an optimum range to reduce rod contamination rate and yet provide reliable flame sensing when the rod contamination built up. The adaptation may be algorithmic-based with the facilitation of a microcontroller. The system may provide the high voltage signals from a low voltage power supply, such as that of 24 VAC.
    Type: Grant
    Filed: May 12, 2005
    Date of Patent: November 29, 2011
    Assignee: Honeywell International Inc.
    Inventors: Timothy J. Nordberg, Brent Chian
  • 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
  • Publication number: 20110070550
    Abstract: A control apparatus for a gas-fired heating appliance having a burner is provided for sensing burner flame instability. The apparatus includes a sensor for sensing a flame and providing an output of a flame current signal, and a controller in communication with the sensor for sensing flame current. The controller is configured to receive the flame current signal and to detect the occurrence of a flame instability condition. The controller detects flame instability from flame current signal data that is measured and Fourier transformed into a frequency spectrum which changes from a stable to instable spectrum when flame instability is caused by an inadequate air-to-fuel ratio. The controller is configured to respond to flame instability by generating an output signal to increase the speed of a combustion air blower that supplies air to the burner, to thereby increase the air flow relative to fuel flow until normal combustion is attained.
    Type: Application
    Filed: September 16, 2010
    Publication date: March 24, 2011
    Inventor: Jeffrey N. Arensmeier
  • Patent number: 7800508
    Abstract: A system for adjusting a bias voltage of a flame sensing system. The system may use pulse width modulation to adjust the bias voltage. The system may have a flame sensing rod that conveys an electrical equivalent circuit of a flame presence to a detector via low pass filter. An excitation voltage may be conveyed via a DC blocking mechanism to the sensing rod. A pulse width modulation signal may be conveyed via a bias resistor to a node of the low pass filter and the detector. The input of an A/D converter may be that of the detector for flame signals. Also, leakages between the node of the A/D converter connection and the voltage source and/or ground may be detected and compensated. Further, leakage of the DC blocking mechanism may be minimized.
    Type: Grant
    Filed: May 12, 2005
    Date of Patent: September 21, 2010
    Assignee: Honeywell International Inc.
    Inventors: Brent Chian, John T. Adams, Timothy J. Nordberg, Bruce Hill, Peter M. Anderson
  • Patent number: 7768410
    Abstract: A flame sensing system having a flame rod, a signal generator, a signal measurement circuit, and a controller, where the frequency and/or amplitude of the excitation signal may be variable. The signal measurement circuit may include a bias circuitry that references the flame signal to a voltage, a capacitor that varies the filtration, an AC coupling capacitor, a current limiting resistor, and a low-pass filter. The system may determine the flame-sensing rod contamination, the stray capacitance of the flame sensing system, and compensate for stray capacitance in the flame sensing system. The flame model may include a circuit that simulates a flame in the presence of the sensing rod, and another circuit that simulates a contact surface between the flame and the sensing rod.
    Type: Grant
    Filed: May 12, 2005
    Date of Patent: August 3, 2010
    Assignee: Honeywell International Inc.
    Inventor: Brent Chian
  • Patent number: 7690916
    Abstract: A method and an apparatus for operating a gas-powered cooking device including an actuator for moving a closure disposed in the gas feed conduit of a burner to an open state and of igniting gas emitted from the burner by an ignition electrode to form a burner flame, the ignition electrode being connected to an ignition voltage for a predetermined first interval of time, a sensor thermo-conductively connected to the burner flame for generating a sensor voltage for maintaining the closure means in its open state if the sensor voltage attains a predetermined level and of initiating subsequent ignitions after a predetermined interval of time where the predetermined level is not attained within a predetermined further interval of time.
    Type: Grant
    Filed: April 14, 2003
    Date of Patent: April 6, 2010
    Assignee: Miele & Cie. KG
    Inventors: Fred Bulthaup, Andreas Telkemeier
  • Publication number: 20090098492
    Abstract: A flame sensor apparatus for use with a flame heated thermal abatement reactor is provided, including a flame sensor adapted to sense a flame within the thermal abatement reactor; and a shutter adapted to selectively block the transmission of radiation from the flame to the flame sensor.
    Type: Application
    Filed: October 24, 2008
    Publication date: April 16, 2009
    Applicant: Applied Materials, Inc.
    Inventors: Ho-Man Rodney Chiu, Daniel O. Clark, Shaun W. Crawford, Jay J. Jung, Youssef A. Loldj, Robbert M. Vermeulen
  • Patent number: 7428901
    Abstract: A cooking stove that prevents the execution of a process such as ignition of a burner when a touch switch changes from a non-sensing state to a sensing state. In STEP201, when a first touch switch, which is one of the touch switches provided in an operation, is turned on from off, the process advances to STEP202, where a controller provided in a cooking stove main body starts a 1-second timer. The controller executes a loop composed of STEP203 and STEP210. When a second touch switch, which is one of the touch switches and is different from the first touch switch, is turned on from off in STEP210 before the 1-second timer times up in STEP203, the process advances from STEP210 to STEP211. The controller performs “error reporting” by blinking a display portion and activating a buzzer.
    Type: Grant
    Filed: April 26, 2005
    Date of Patent: September 30, 2008
    Assignee: Rinnai Corporation
    Inventors: Atsuhito Gama, Shinichiro Hata, Hiroyuki Yamada, Kazuya Hirota
  • Patent number: 7422010
    Abstract: A cooking stove that prevents a burner from being ignited when a touch switch shifts from a non-sensing to a sensing state. An operation portion having a touch switch is provided on a glass top plate of a cooking stove main body which accommodates burners. The touch switch allowing a user to give instruction on actuation and stoppage of the burners and sensing an object that contacts or approaches the top surface of the glass to plate. Heating control means for determining whether the touch switch is on (a sensing state) or off (a non-sensing state) to control actuation of the heating means. While the burner is at a stop, when the touch switch is turned on and then off again, the heating control means ignites the burner. While the burner is in operation, when the touch switch is turned on, the heating control means extinguishes the burner.
    Type: Grant
    Filed: March 29, 2005
    Date of Patent: September 9, 2008
    Assignee: Rinnai Corporation
    Inventors: Atsuhito Gama, Shinichiro Hata, Hiroyuki Yamada, Kazuya Hirota
  • Patent number: 7380588
    Abstract: A heat pump type heating and air conditioning system includes a gas furnace or other auxiliary heat source and a thermostat and controller associated with the heat pump and the auxiliary heat source for automatically energizing the heat pump if the auxiliary heat source is inoperative regardless of whether or not the automatic heating mode has been selected or the auxiliary heating mode has been selected by the user of the system. A method of operating a heat pump system with an auxiliary heating source to automatically change from operation of the heat pump to the auxiliary heating source depending on conditions such as outdoor temperature, and to automatically change back to operation of the heat pump if the auxiliary heating source is inoperable.
    Type: Grant
    Filed: January 12, 2004
    Date of Patent: June 3, 2008
    Assignee: Trane International Inc.
    Inventor: Robert W. Helt
  • Patent number: 7370649
    Abstract: A touch switch which prohibits a child from actuating heating means, while permitting a child to deactivate heating means. A cooking stove including an electrical capacitance operation switch 10 which switches the cooking stove between an operation state in which an ignition instruction is enabled and a standby state in which the ignition instruction is disabled; the operation switch is used to instruct the cooking stove to be extinguished. When the cooking stove is inactive, a switch circuit 63 selects a resistance element 61 offering a higher resistance to set the cooking stove in a “lower sensitivity set state” in which the operation switch 10 has a sensitivity sl. When the cooking stove is active, the switch circuit 63 selects a resistance element 62 offering a lower resistance to set the cooking stove in a “higher sensitivity set state” in which the operation switch 10 has a sensitivity sh (>sl).
    Type: Grant
    Filed: May 17, 2005
    Date of Patent: May 13, 2008
    Assignee: Rinnai Corporation
    Inventors: Atsuhito Gama, Shinichiro Hata, Hiroyuki Yamada, Kazuya Hirota
  • Patent number: 7314370
    Abstract: A method of verifying proper operation of an electromagnetic valve. The method includes providing a mechanism to effect opening of the valve, verifying that the valve opened as a result of employing the mechanism to effect opening of the valve and after verifying the valve opened, signaling the valve to close after a first period of time has elapsed. The method further includes, after signaling the valve to close, signaling the valve to re-open after a second period of time has elapsed and detecting the occurrence or non-occurrence of an event associated with the closing or re-opening of the valve.
    Type: Grant
    Filed: December 23, 2004
    Date of Patent: January 1, 2008
    Assignee: Honeywell International Inc.
    Inventors: Brent Chian, Donald J. Kasprzyk, Sybrandus B. V. Munsterhuis, Timothy J. Nordberg, Willem Vander Werf, Robert L. Zak, Andres Waszczenko
  • Patent number: 7255285
    Abstract: The present invention is directed at systems and methods for detecting flue blockages in an HVAC system without the addition of numerous additional sensor elements, wiring, and connections that can unduly increase the cost and possibly reduce the reliability of the HVAC system. In an illustrative embodiment of the present invention, changes in the output of a flame sensor are used to detect when a likely flue blockage exists.
    Type: Grant
    Filed: October 31, 2003
    Date of Patent: August 14, 2007
    Assignee: Honeywell International Inc.
    Inventors: Henry E. Troost, Richard Simons
  • 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: 7238020
    Abstract: A control device for controlling hydrogen flow of a hydrogen storage canister accommodated in a canister containing chamber includes a heating device which is connected to a heating fuel storage tank via a heating fuel supplying pipeline for conveying a heating fuel to a catalyst bed in the canister containing chamber and generating heat by combustion of the heating fuel at the catalyst bed. A blowing device provides an air flow to the canister containing chamber. A controller controls the operation of the heating device and the blowing device in correspondence to a temperature signal detected from an internal space of the canister containing chamber. The controller is coupled with a setting unit for setting various parameters which are stored in a parameter storage unit for controlling the controller.
    Type: Grant
    Filed: December 16, 2003
    Date of Patent: July 3, 2007
    Assignee: Asia Pacific Fuel Cell Technologies, Ltd.
    Inventors: Jefferson Y S Yang, Yingjeng James Li
  • Patent number: 7008217
    Abstract: A safety device for an industrial boiler (CHA) including electromechanical relays (REn, RS), which are connected in series in order to form an electromechanical safety chain (CH1), and at least one shunt relay (RTn) which is normally open and mounted in parallel to one of the electromechanical relays (REN). The shunt relay is controlled by an automaton (AP1) so that it is closed during a time delay. The shunt relay (RTn) is provided with a contact that is connected to an electronic circuit (CEn) and said electronic circuit (CEn) opens an electromechanical relay (RS) which is mounted in series in the safety chain when the shunt relay (RTn) is closed for longer than the time delay. Given the arrangement, in the event of an automaton failure, the time delay is ensured by the electronic circuit so that a satisfactory level of safety is guaranteed in relation to the installation.
    Type: Grant
    Filed: May 17, 2002
    Date of Patent: March 7, 2006
    Assignee: ALSTOM Switzerland Ltd
    Inventor: Charles Jacobberger
  • Patent number: 6942482
    Abstract: A safety circuit 31, which compulsorily closes an on-off valve for supplying a gas to a burner when a microcomputer for performing a combustion control is in an abnormal condition, does not operate unless abnormality occurs to the microcomputer 1, and therefore even when the safety circuit 31 is out of order, an ignition operation is performed as it is. A transistor 4 is not turned off until a fixed time elapses from a start of an ignition sequence in the safety circuit 31, but the fixed time is shortened by a timer acceleration circuit 32, and if the transistor 4 is turned off by a transistor 2 being turned on, the safety circuit 31 is determined as normal, so that the normal ignition sequence is executed thereafter.
    Type: Grant
    Filed: August 29, 2003
    Date of Patent: September 13, 2005
    Assignees: Rinnai Corporation, RB Controls Co., Ltd.
    Inventors: Katsutoshi Honda, Koji Nozawa
  • Patent number: 6923640
    Abstract: An ignition system includes a burner, a power supply, an electrical system including a ground conductor, and an ignition module. The ignition module includes a first input, a second input, and an output. The output is operatively coupled to the burner, while one of the inputs is coupled to said ground conductor, and the other of the inputs is coupled to the power supply.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: August 2, 2005
    Assignee: General Electric Company
    Inventor: Daniel Canon
  • Publication number: 20040048212
    Abstract: A safety circuit 31, which compulsorily closes an on-off valve for supplying a gas to a burner when a microcomputer for performing a combustion control is in an abnormal condition, does not operate unless abnormality occurs to the microcomputer 1, and therefore even when the safety circuit 31 is out of order, an ignition operation is performed as it is. A transistor 4 is not turned off until a fixed time elapses from a start of an ignition sequence in the safety circuit 31, but the fixed time is shortened by a timer acceleration circuit 32, and if the transistor 4 is turned off by a transistor 2 being turned on, the safety circuit 31 is determined as normal, so that the normal ignition sequence is executed thereafter.
    Type: Application
    Filed: August 29, 2003
    Publication date: March 11, 2004
    Inventors: Katsutoshi Honda, Koji Nozawa
  • Patent number: 6666676
    Abstract: A programmable burner for gas stoves, which is constituted by a gas burner and a safety valve that includes a thermocouple, which is located in coincidence with an external edge of the burner. The safety valve is maintained open when the thermocouple is detecting the presence of a flame on the gas burner and is closed when the burner has been turned off. An electrode is placed near of the external periphery of the burner for igniting. A spark generation module is connected with the electrode for generating the sparks for igniting the burner. A spark interrupter is connected to the spark generation module, the spark interrupter being located over a burner knob that is connected to the safety valve, for activating or deactivating the spark generation of the spark generation module. Finally a programmable device is connected with the thermocouple and the security valve, for programming the ignition time of the burner in accordance with a preestablished operation time by user.
    Type: Grant
    Filed: August 15, 2001
    Date of Patent: December 23, 2003
    Assignee: Comercial Acros Whirlpool S.A. De C.V.
    Inventors: Jorge Rodriguez-Rodriguez, David H. Fredin Garcia
  • Patent number: 6572364
    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: Grant
    Filed: July 18, 2001
    Date of Patent: June 3, 2003
    Assignee: RB Controls Co., Ltd.
    Inventors: Hajime Kawauchi, Toshihisa Terade
  • Patent number: 6439878
    Abstract: When an error occurs to a combustion device, a microcomputer inside a control apparatus for the combustion device closes a safety valve thereby stopping gas supply to a gas burner. In a conventional control apparatus, when a power source resetting is actuated with a power switch, the safety valve is opened to supply the gas burner with gas even though the cause for the error has not been resolved. As a solution, when an error occurs, the fact of such an occurrence is stored in a nonvolatile memory, i.e., electrically erasable programmable read-only memory, EEPROM. It is so arranged that, unless the reset switch is operated, the memory in the EEPROM is not reset. After resetting, the memory in the EEPROM is read out. As long as the reset has not been made, the safety valve is not opened, but the program immediately proceeds to a state in which the operation of the reset switch is held in suspension.
    Type: Grant
    Filed: July 18, 2001
    Date of Patent: August 27, 2002
    Assignee: RB Controls Co., LTD
    Inventors: Hajime Kawauchi, Toshihisa Terade
  • Publication number: 20020106597
    Abstract: A flame atmosphere analyzer is described and comprises a tube, in which an air-gas intake and mixing chamber is defined, a gas-supply nozzle, and primary combustion-air supply means opening into the intake chamber, as well as a flame burner comprising at least one flame jet which is in flow communication with the intake and mixing chamber in order to supply an air-gas mixture formed in the chamber. The primary air-supply means comprise at least one duct which has a first end in flow communication with the intake chamber and which is open at the opposite, second end in order to take in primary combustion air in a position remote and at a predetermined distance from the intake chamber in the tube. A water-heating device including the above-mentioned flame atmosphere analyzer is also described.
    Type: Application
    Filed: February 8, 2002
    Publication date: August 8, 2002
    Applicant: OP CONTROLS S.p.A.
    Inventors: Maurizio Grando, Michele Bortoliero, Filippo Mingardo
  • 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
  • Patent number: 6050807
    Abstract: A method and an apparatus for controlling an amount of air of a gas boiler are disclosed. Detecting section detects a flame voltage of the gas boiler to output a flame voltage value signal which represents a flame voltage value. An air supplying fan supplies air into the gas boiler. A sensing section senses a rotative velocity of the air supplying fan to output a sensing signal which represents a present rotative velocity of the air supplying fan.
    Type: Grant
    Filed: September 18, 1998
    Date of Patent: April 18, 2000
    Assignee: Daewoo Electronics Co. Ltd.
    Inventor: Sung-Hak Baek
  • Patent number: 5990798
    Abstract: An atomic absorption photometer includes a microprocessor which is programmed so as to affirmatively create an unsafe condition by lowering the pressure inside the flow route of a combustion improving gas and to check if the gas switch in this flow route indicates this unsafe condition. If it is found that this unsafe condition is not being indicated by the switch, a warning signal is outputted and the use of flame by the photometer is prevented.
    Type: Grant
    Filed: December 15, 1998
    Date of Patent: November 23, 1999
    Assignee: Shimadzu Corporation
    Inventor: Masumi Sakai
  • Patent number: 5957679
    Abstract: A direct spark ignition control system is provided for controlling for a gas fireplace burner. A solenoid is operatively controlled for supplying gas to the gas fireplace burner. A high voltage spark ignition circuit is operatively controlled for generating ignition sparks near the gas fireplace burner. A flame sensing circuit coupled to the gas fireplace burner provides a feedback signal to activate and deactivate the high voltage spark ignition circuit. A timing and control circuit provides a control signal to energize the solenoid and provides a control signal to deactivate the high voltage spark ignition circuit and a control signal to deenergize the solenoid after a set time period with the burner flame feedback signal activated.
    Type: Grant
    Filed: July 22, 1997
    Date of Patent: September 28, 1999
    Assignee: Harper-Wyman Company
    Inventor: Joseph J. Cacciatore
  • Patent number: 5863194
    Abstract: Arrangement for interrogating multiple switch conditions employs a single input microprocessor for a plurality of switch elements that are coupled in series with an operating element and a power source. A variable oscillator has a control input and an output coupled to the microprocessor input, providing a periodic signal to the same. A plurality of impedance elements, e.g., resistors, each with a respective value, are coupled between a respective junction between two successive switch elements and the control input of said variable oscillator, such that the rate of said periodic signal varies as a function of the open or closed condition of the respective switch elements. For each switch being tested, the microprocessor looks for one predetermined frequency or pulse rate corresponding to an open condition and another corresponding to a closed condition.
    Type: Grant
    Filed: March 27, 1996
    Date of Patent: January 26, 1999
    Assignee: Andrew S. Kadah
    Inventors: Andrew S. Kadah, Hassan B. Kadah
  • Patent number: 5812061
    Abstract: A sensor provides a status signal indicating a condition of an operating system to the operating system's control system. The sensor has an inherent variable quantity such as resistance whose magnitude indicates the operating system status. The control system includes a user-operable switch which when actuated signals the microprocessor to determine the approximate value of the sensor's variable quantity. The magnitude of the variable quantity is then indicated by a signal comprising one or more beeps of sound or flashes of light. The number of beeps or flashes indicates the approximate present magnitude of the sensor's variable quantity. In a preferred embodiment, the control system comprises a microprocessor programmed to control the operating system and to perform most of the functions of the invention.
    Type: Grant
    Filed: February 18, 1997
    Date of Patent: September 22, 1998
    Assignee: Honeywell Inc.
    Inventor: Richard W. Simons
  • Patent number: 5775236
    Abstract: There is disclosed a combustion control circuit of a combustion apparatus with a driving signal generator, an exhaust fan controller and a gas valve controller, including: a combustion state detector for detecting the state of combustion occurring within a combustion chamber according to an output signal of a flame sensor installed in the combustion chamber, and for producing a signal corresponding to the state of combustion; a reference signal generator for producing a reference signal in response to each output signal of a temperature sensor and a flow sensor; a comparator for comparing the output signal of the combustion state detector with the output signal of the reference signal generator, and for outputting a signal corresponding to a difference therebetween; and an adder for adding the output signal of the comparator to the output signal of the driving signal-generator, and for respectively applying an output to each one of the exhaust fan controller and the gas valve controller.
    Type: Grant
    Filed: November 12, 1996
    Date of Patent: July 7, 1998
    Assignee: Haitai Electronics Co., Ltd.
    Inventors: Gordon William Fenn, Young Moon Ryoo, Hong Jib Kim
  • Patent number: 5722822
    Abstract: Method and apparatus are disclosed for checking the responsiveness of a circuit which senses the presence of a flame produced by a burner within a furnace. A programmed processor associated with the circuit measures the time the circuit takes to indicate the presence of a flame. A warning is generated when the measured time exceeds a predetermined allowable time. The allowable time is determined by taking into account the decreased responsiveness of an electrode that indicates the presence of the burner flame.
    Type: Grant
    Filed: May 3, 1995
    Date of Patent: March 3, 1998
    Assignee: Carrier Corporation
    Inventors: Larry E. Wilson, Craig R. Knotts, Daniel L. Kelly
  • Patent number: 5599180
    Abstract: A circuit arrangement for flame detection for a transistor coil ignition system of a burner is disclosed. The transistor coil ignition system features a trigger stage which triggers a power transistor that is located in the power circuit of the primary winding of an ignition coil in order to charge the primary winding of the ignition coil with a charging current from a power supply. A circuit arrangement includes a switch having an ignition position and a flame detection position which in the flame detection position restricts the charging current flowing via the primary winding of the ignition coil to an intensity that lies below the charging current intensity needed to generate an ignition spark in the ignition position, so that ignition spark-over cannot take place without a flame.
    Type: Grant
    Filed: July 25, 1994
    Date of Patent: February 4, 1997
    Assignee: Beru Ruprecht GmbH & Co. KG
    Inventors: Odd Peters, Dieter Teutsch
  • Patent number: 5506569
    Abstract: An electric control is shown for gas furnaces which controls fan motors and ignition controls based on inputs from a room thermostat (32), a high limit control and an ignition control (14) including a gas valve. A flame sense circuit (42, 42') is coupled to a microprocessor (U2) and includes a flameprobe (P1) energized by line power through a capacitor (C3) via a quick connect (QC31). A capacitor (C4) is charged by a 5 volt DC source through resistor (R12) and inputted to an inverter (U3, S2) which provides a low signal to the microprocessor when no flame is present. When a flame is present the capacitor (C4) discharges through the flame causing the inverter to change state providing a high to the microprocessor indicating that a flame is present. A diagnostic network comprising a low leakage diode (CR10) and serially connected resistor (R11) is coupled between the microprocessor (pin 8) and the input of the inverter (U3) so that the operation of the flame sense circuit can be tested.
    Type: Grant
    Filed: May 31, 1994
    Date of Patent: April 9, 1996
    Assignee: Texas Instruments Incorporated
    Inventor: Mitchell R. Rowlette