EP0773409A1 - System for automatically seeking the minimum power deliverable by gas-fired atmospheric burners - Google Patents

System for automatically seeking the minimum power deliverable by gas-fired atmospheric burners Download PDF

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Publication number
EP0773409A1
EP0773409A1 EP95117841A EP95117841A EP0773409A1 EP 0773409 A1 EP0773409 A1 EP 0773409A1 EP 95117841 A EP95117841 A EP 95117841A EP 95117841 A EP95117841 A EP 95117841A EP 0773409 A1 EP0773409 A1 EP 0773409A1
Authority
EP
European Patent Office
Prior art keywords
flame
flow rate
burner
microcontroller
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95117841A
Other languages
German (de)
French (fr)
Other versions
EP0773409B1 (en
Inventor
Luca c/o Whirlpool Europe S.R.L. Frasnetti
Giampiero c/o Wirlpool Europe srl Santacatterina
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Whirlpool Europe BV
Original Assignee
Whirlpool Europe BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Whirlpool Europe BV filed Critical Whirlpool Europe BV
Priority to AT95117841T priority Critical patent/ATE203811T1/en
Priority to DE69522002T priority patent/DE69522002T2/en
Priority to EP95117841A priority patent/EP0773409B1/en
Priority to ES95117841T priority patent/ES2160138T3/en
Publication of EP0773409A1 publication Critical patent/EP0773409A1/en
Application granted granted Critical
Publication of EP0773409B1 publication Critical patent/EP0773409B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/12—Arrangement or mounting of control or safety devices
    • F24C3/126—Arrangement or mounting of control or safety devices on ranges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
    • F23N5/203—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/08—Microprocessor; Microcomputer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/20—Calibrating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/36—Spark ignition, e.g. by means of a high voltage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/20—Warning devices
    • F23N2231/22—Warning devices using warning lamps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/16—Fuel valves variable flow or proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/08—Household apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples

Definitions

  • This invention relates to a system for setting the minimum level of a gas-fired atmospheric burner, particularly for cooking hobs, ovens and like domestic appliances, the burner being associated with flow rate regulator means and flame detection and ignition devices.
  • the minimum flame power deliverable by any gas-fired atmospheric burner is influenced by a large number of factors, resulting in the minimum flame power not being able to be correctly set by the final user if using known burners and the relative currently used flow rate regulator means (taps).
  • a minimum power regulator screw is currently provided on the tap.
  • This screw is used to preset at the manufacturing stage the minimum gas flow rate required to ensure that the flame is present when the gas pressure is the minimum prescribed by regulations.
  • the installer makes a fine adjustment using this screw. In this manner the minimum gas flow rate is ensured, but only under the operating conditions prevailing at the moment of this adjustment.
  • the minimum flow rate preset in this manner can undergo change to the extent of resulting in extinguishing of the burner.
  • the reference numeral 1 indicates a conventional gas-fired atmospheric burner connected to a gas source via a pipe 2 into which there is connected a gas flow rate control device 3, which may be a pulse-duration modulation controlled solenoid valve, a proportional valve, a motorized tap or similar means enabling the gas flow rate to be regulated non-manually.
  • the device 3 is controlled by a microcontroller (or the like) indicated by 4.
  • a flame detector such as a thermocouple
  • an electrical-discharge ignition device 6 the electrode of which is indicated by 7.
  • thermocouple 5 is connected to an input of the microcontroller 4 via an electronic signal conditioner 8, the purpose of which is to provide said input with a digital signal indicating flame present or flame absent.
  • a user interface 9 ie a device provided with controls (of touch, knob, slider, pushbutton or similar type) on which the user acts to obtain the required flame power at the burner.
  • the illustrated example shows in particular an ignition pushbutton 11, a display 12 showing the chosen power and two pushbuttons, one 13 for increase and one 14 for decrease, for selecting the desired power.
  • a certain number (for example 9) of preset flame power levels is memorized in the microcontroller 4, the lowest level being that which enables the flame to remain alight at the minimum gas pressure prescribed by regulations. This hence ensures the existence of the flame under any operating condition on initial ignition of the burner if minimum power level is selected by the pushbuttons 13, 14.
  • the user If the user wishes to obtain a power level less than that memorized (for example because the particular cooking operation requires a long time at a very low power level), the user operates the selection pushbuttons, for example by keeping the finger pressed on the power decrease pushbutton 14 after this has attained the lowest level.
  • the microcontroller 4 then acts on the flow rate control device 3 so as to slowly reduce the power delivered by the burner 1. At the same time the microcontroller 4 continues to check the presence of the flame by reading the digital signal provided by the conditioning circuit 8 connected to the thermocouple 5.
  • the flow rate reduction finally reaches the point at which the flame of the burner 1 is extinguished. This occurrence is sensed by the thermocouple, and a corresponding signal reaches the microcontroller 4 to enable it to determine the final flow rate level able to maintain the flame alight.
  • the microcontroller 4 then relights the flame by operating the electrical-discharge ignition device 6, 7 and acting on the flow rate control device 3 to obtain a flow rate which facilitates burner ignition (this flow rate value is memorized in the memory of the microcontroller 4).
  • the microcontroller Having achieved relighting, the microcontroller returns the gas flow rate to the minimum level just determined, as required by the user.
  • the burner 1 can now operate at the real minimum flow rate relative to the particular operating conditions of the moment.
  • the microcontroller 4 having been informed of the absence of flame at the burner 1, gradually increases the gas flow rate (within a preferred range but to less than a maximum value of minimum flow rate) and keeps the ignition device 6, 7 in operation, to then halt the increase in flow rate when it is informed that the flame is alight, this corresponding to a new minimum flow rate level.
  • a suitable visual indicator for example is activated, indicated by 20 and positioned on the interface 9.
  • the system is able to return to the preset minimum flow rate value which preceded the extinguishing of the flame.
  • microcontroller 4 sensing the signal (originating from the thermocouple 5) indicating that the flame has been relit at the new flow rate value, sensing the lack of signal from the interface 9, and comparing the flow rate value reached after re-ignition, with the preset value.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Fuel Cell (AREA)

Abstract

An atmospheric burner (1) is associated with a flame presence sensor (5, 8) and an electrical-discharge ignition device (6, 7). It is fed via a flow rate control device (7). Both the ignition device and the flow rate control device are controlled by a microcontroller (4).
A user interface (9) enables the user to select the desired power by sending to the microcontroller (4) a request for altering the flow rate and hence for altering the minimum power deliverable by the burner (1).

Description

  • This invention relates to a system for setting the minimum level of a gas-fired atmospheric burner, particularly for cooking hobs, ovens and like domestic appliances, the burner being associated with flow rate regulator means and flame detection and ignition devices.
  • The minimum flame power deliverable by any gas-fired atmospheric burner is influenced by a large number of factors, resulting in the minimum flame power not being able to be correctly set by the final user if using known burners and the relative currently used flow rate regulator means (taps).
  • One of the factors most influencing regulation is clearly the gas pressure at the burner. This pressure can undergo daily fluctuation determined by the number of users simultaneously drawing gas from the mains for their appliances. It can also be influenced by the fact that the various users are connected to the mains at different points thereof, resulting in various pressure drops and pressure fluctuations.
  • Consequently to ensure that on rotating the tap into the minimum flame power position the flame remains alight under "any" operating conditions, a minimum power regulator screw is currently provided on the tap. This screw is used to preset at the manufacturing stage the minimum gas flow rate required to ensure that the flame is present when the gas pressure is the minimum prescribed by regulations. When the appliance provided with a burner preset in this manner is installed on the premises of the final user, the installer makes a fine adjustment using this screw. In this manner the minimum gas flow rate is ensured, but only under the operating conditions prevailing at the moment of this adjustment.
  • In the case of pressure change, a higher air percentage present in the pipes, surrounding draughts able to disturb the flame, dirt on the burner or any other influencing circumstance, the minimum flow rate preset in this manner can undergo change to the extent of resulting in extinguishing of the burner.
  • To solve the aforesaid problems the invention provides an automatic control system the characterising aspects of which are defined in the accompanying claims.
  • The invention will be more apparent from the detailed description of a preferred embodiment thereof given hereinafter with reference to the accompanying drawing, which shows schematically a control arrangement for a gas-fired atmospheric burner.
  • In the figure, the reference numeral 1 indicates a conventional gas-fired atmospheric burner connected to a gas source via a pipe 2 into which there is connected a gas flow rate control device 3, which may be a pulse-duration modulation controlled solenoid valve, a proportional valve, a motorized tap or similar means enabling the gas flow rate to be regulated non-manually. The device 3 is controlled by a microcontroller (or the like) indicated by 4. About the burner 1, such as to be grazed by the relative flame, there are provided a flame detector (such as a thermocouple) 5 and an electrical-discharge ignition device 6 the electrode of which is indicated by 7.
  • The thermocouple 5 is connected to an input of the microcontroller 4 via an electronic signal conditioner 8, the purpose of which is to provide said input with a digital signal indicating flame present or flame absent.
  • To the microcontroller 4 there is connected a user interface 9, ie a device provided with controls (of touch, knob, slider, pushbutton or similar type) on which the user acts to obtain the required flame power at the burner. The illustrated example shows in particular an ignition pushbutton 11, a display 12 showing the chosen power and two pushbuttons, one 13 for increase and one 14 for decrease, for selecting the desired power.
  • A certain number (for example 9) of preset flame power levels is memorized in the microcontroller 4, the lowest level being that which enables the flame to remain alight at the minimum gas pressure prescribed by regulations. This hence ensures the existence of the flame under any operating condition on initial ignition of the burner if minimum power level is selected by the pushbuttons 13, 14.
  • If the user wishes to obtain a power level less than that memorized (for example because the particular cooking operation requires a long time at a very low power level), the user operates the selection pushbuttons, for example by keeping the finger pressed on the power decrease pushbutton 14 after this has attained the lowest level. The microcontroller 4 then acts on the flow rate control device 3 so as to slowly reduce the power delivered by the burner 1. At the same time the microcontroller 4 continues to check the presence of the flame by reading the digital signal provided by the conditioning circuit 8 connected to the thermocouple 5.
  • The flow rate reduction finally reaches the point at which the flame of the burner 1 is extinguished. This occurrence is sensed by the thermocouple, and a corresponding signal reaches the microcontroller 4 to enable it to determine the final flow rate level able to maintain the flame alight. The microcontroller 4 then relights the flame by operating the electrical-discharge ignition device 6, 7 and acting on the flow rate control device 3 to obtain a flow rate which facilitates burner ignition (this flow rate value is memorized in the memory of the microcontroller 4).
  • Having achieved relighting, the microcontroller returns the gas flow rate to the minimum level just determined, as required by the user. The burner 1 can now operate at the real minimum flow rate relative to the particular operating conditions of the moment.
  • Simultaneously, all the operating conditions of the burner regulation system are recalibrated on the basis of the new minimum-level conditions in accordance with the new parameters contained in the microcontroller.
  • If these operating conditions should change such as to result in extinguishing of the flame (for example due to pressure fall, draughts in the working environment, dirt accumulating on the burner during cooking, etc.), the microcontroller 4, having been informed of the absence of flame at the burner 1, gradually increases the gas flow rate (within a preferred range but to less than a maximum value of minimum flow rate) and keeps the ignition device 6, 7 in operation, to then halt the increase in flow rate when it is informed that the flame is alight, this corresponding to a new minimum flow rate level.
  • If this ignition does not occur within the said flow rate range, a suitable visual indicator for example is activated, indicated by 20 and positioned on the interface 9.
  • In addition, the system is able to return to the preset minimum flow rate value which preceded the extinguishing of the flame.
  • This is achieved by the microcontroller 4 sensing the signal (originating from the thermocouple 5) indicating that the flame has been relit at the new flow rate value, sensing the lack of signal from the interface 9, and comparing the flow rate value reached after re-ignition, with the preset value.

Claims (7)

  1. A system for automatically seeking the minimum power deliverable by gas-fired atmospheric burners (1), comprising a flame presence sensing device (5, 8), a flame ignition device (6, 7), a device (3) for controlling the gas flow rate to the burner (1), and a device (9) enabling the burner (1) to be controlled by the user, characterised in that these devices are connected to a microcontroller (4) which operates the flame control device (3) and the flame ignition device (6, 7) on the basis of signals which it receives from the remaining two devices (9 and 5, 8), such that extinguishing of the flame leads to an increase in the gas flow rate, with the flame ignition device (6, 7) being operated until the flame is re-established.
  2. A system as claimed in claim 1, wherein the device (3) controlling the gas flow rate to the burner (1) is a flow regulator valve controlled by the microcontroller.
  3. A system as claimed in the preceding claims, wherein the flame presence sensing device (5, 8) comprises a thermocouple and a conditioning device, this latter informing the microcontroller (4) whether the flame is alight or whether the flame is extinguished.
  4. A system as claimed in the preceding claims, wherein the flame ignition device (6, 7) operates by electrical discharge.
  5. A system as claimed in the preceding claims, wherein at the request of the user, formulated via the control device (9), a given minimum flow rate is decreased until a lesser flow rate value at which the flame becomes extinguished is reached, this lesser value then being increased until the flame has been relit.
  6. A system as claimed in one or more of the preceding claims, wherein the extinguishing of the flame of the burner (1) due to a change in operating conditions results in relighting of the flame at a gas flow rate level which ensures that the flame is maintained under these changed operating conditions.
  7. A system as claimed in claim 6, characterised by comprising a warning light (20) which is activated if, after the gas flow rate has been changed within a predetermined range but to less than a maximum value of minimum flow rate, it is not possible to relight the flame after it has been extinguished.
EP95117841A 1995-11-13 1995-11-13 System for automatically seeking the minimum power deliverable by gas-fired atmospheric burners Expired - Lifetime EP0773409B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT95117841T ATE203811T1 (en) 1995-11-13 1995-11-13 SYSTEM FOR AUTOMATIC MINIMUM POWER SEARCH DELIVERED BY ATMOSPHERIC GAS BURNERS
DE69522002T DE69522002T2 (en) 1995-11-13 1995-11-13 System for automatic minimum power search supplied by atmospheric gas burners
EP95117841A EP0773409B1 (en) 1995-11-13 1995-11-13 System for automatically seeking the minimum power deliverable by gas-fired atmospheric burners
ES95117841T ES2160138T3 (en) 1995-11-13 1995-11-13 SYSTEM TO AUTOMATICALLY SEARCH FOR THE MINIMUM POWER SUPPLIED BY ATMOSPHERIC BURNERS SUPPLIED BY GAS.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95117841A EP0773409B1 (en) 1995-11-13 1995-11-13 System for automatically seeking the minimum power deliverable by gas-fired atmospheric burners

Publications (2)

Publication Number Publication Date
EP0773409A1 true EP0773409A1 (en) 1997-05-14
EP0773409B1 EP0773409B1 (en) 2001-08-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95117841A Expired - Lifetime EP0773409B1 (en) 1995-11-13 1995-11-13 System for automatically seeking the minimum power deliverable by gas-fired atmospheric burners

Country Status (4)

Country Link
EP (1) EP0773409B1 (en)
AT (1) ATE203811T1 (en)
DE (1) DE69522002T2 (en)
ES (1) ES2160138T3 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2787177A1 (en) * 1998-12-15 2000-06-16 Europ Equip Menager CONTROL DEVICE FOR A GAS BURNER
WO2000063620A1 (en) * 1999-04-15 2000-10-26 Caldera Corporation Gas cooktop and control system
WO2001029483A1 (en) * 1999-10-18 2001-04-26 Pierre Repper Electronic gas cooktop control with simmer system and method thereof
EP1293728A3 (en) * 2001-09-14 2003-08-27 Rational AG Method for controlling the power of a gas cooking appliance as well as a cooking appliance using this method
WO2005031215A1 (en) * 2003-09-25 2005-04-07 BSH Bosch und Siemens Hausgeräte GmbH Gas cooking surface
JP2014142119A (en) * 2013-01-24 2014-08-07 Harman Co Ltd Gas range
CN104896534A (en) * 2015-06-23 2015-09-09 苏州和美电器科技有限公司 Intelligent integrated-kitchen mainboard control system
JP2016217651A (en) * 2015-05-22 2016-12-22 株式会社ハーマン Gas cooking stove

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0124330A1 (en) * 1983-04-21 1984-11-07 Autoflame Engineering Limited Improvements in or relating to fuel burner control systems
JPH01291017A (en) * 1988-05-17 1989-11-22 Noritz Corp Device for capacity control of gas stove
EP0562538A2 (en) * 1992-03-26 1993-09-29 Matsushita Electric Industrial Co., Ltd. Gas burning apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0124330A1 (en) * 1983-04-21 1984-11-07 Autoflame Engineering Limited Improvements in or relating to fuel burner control systems
JPH01291017A (en) * 1988-05-17 1989-11-22 Noritz Corp Device for capacity control of gas stove
EP0562538A2 (en) * 1992-03-26 1993-09-29 Matsushita Electric Industrial Co., Ltd. Gas burning apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014, no. 071 (M - 0933) 9 February 1990 (1990-02-09) *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2787177A1 (en) * 1998-12-15 2000-06-16 Europ Equip Menager CONTROL DEVICE FOR A GAS BURNER
WO2000036341A1 (en) * 1998-12-15 2000-06-22 Brandt Cooking Device for controlling a gas burner
WO2000063620A1 (en) * 1999-04-15 2000-10-26 Caldera Corporation Gas cooktop and control system
WO2001029483A1 (en) * 1999-10-18 2001-04-26 Pierre Repper Electronic gas cooktop control with simmer system and method thereof
US7255100B2 (en) 1999-10-18 2007-08-14 Compuvalve Llc Electronic gas cooktop control with simmer system and method thereof
EP1293728A3 (en) * 2001-09-14 2003-08-27 Rational AG Method for controlling the power of a gas cooking appliance as well as a cooking appliance using this method
WO2005031215A1 (en) * 2003-09-25 2005-04-07 BSH Bosch und Siemens Hausgeräte GmbH Gas cooking surface
US7669590B2 (en) 2003-09-25 2010-03-02 Bsh Bosch Und Siemens Hausgeraete Gmbh Gas cooking surface
JP2014142119A (en) * 2013-01-24 2014-08-07 Harman Co Ltd Gas range
JP2016217651A (en) * 2015-05-22 2016-12-22 株式会社ハーマン Gas cooking stove
CN104896534A (en) * 2015-06-23 2015-09-09 苏州和美电器科技有限公司 Intelligent integrated-kitchen mainboard control system

Also Published As

Publication number Publication date
EP0773409B1 (en) 2001-08-01
ATE203811T1 (en) 2001-08-15
DE69522002D1 (en) 2001-09-06
DE69522002T2 (en) 2002-05-29
ES2160138T3 (en) 2001-11-01

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