EP2906877A1 - Procédé de surveillance d'une vanne à gaz, commande d'une vanne à gaz, et réchaud au gaz - Google Patents

Procédé de surveillance d'une vanne à gaz, commande d'une vanne à gaz, et réchaud au gaz

Info

Publication number
EP2906877A1
EP2906877A1 EP13774626.9A EP13774626A EP2906877A1 EP 2906877 A1 EP2906877 A1 EP 2906877A1 EP 13774626 A EP13774626 A EP 13774626A EP 2906877 A1 EP2906877 A1 EP 2906877A1
Authority
EP
European Patent Office
Prior art keywords
gas valve
gas
valve
current curve
current
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.)
Withdrawn
Application number
EP13774626.9A
Other languages
German (de)
English (en)
Inventor
Jose Antonio Manan
Jordi Alvarez
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.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Geratebau GmbH
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 EGO Elektro Geratebau GmbH filed Critical EGO Elektro Geratebau GmbH
Publication of EP2906877A1 publication Critical patent/EP2906877A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/005—Regulating fuel supply using electrical or electromechanical means
    • 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
    • F23N2235/14—Fuel valves electromagnetically operated

Definitions

  • the invention relates to a method for monitoring a gas valve and a control for a gas valve and a gas cooking appliance.
  • gas valves are provided for each gas hob or gas burner for controlling a gas supply system.
  • a gas valve is provided as a so-called control valve, which can generate an adjustable gas flow to produce a desired power at the gas burner.
  • Another gas valve is connected upstream, usually as a so-called safety valve, which is only opened when a gas flow to a gas burner is to be set via the aforementioned first gas valve or control valve.
  • This safety valve opens in front of the control valve and closes after the control valve. It may be formed, for example, according to DE 10107194 C1.
  • the invention has for its object to provide an aforementioned method, an aforementioned control and a gas cooking appliance, with which problems of the prior art can be solved and it is in particular possible, a failure or a malfunction or a defect to recognize a gas valve.
  • This object is achieved by a method having the features of claim 1, a controller having the features of claim 1 and a gas cooking appliance having the features of claim 14.
  • Advantageous and preferred embodiments of the invention are the subject of the further claims and will be hereinafter explained in more detail. Some of the features are described only for the method, only for the controller or only for the gas cooking appliance. However, they should be able to apply independently for both the process and the control and the gas cooking appliance.
  • the wording of the claims is incorporated herein by express reference.
  • the gas valve has a magnetic drive with a coil or solenoid for the valve function.
  • the basic structure of such a gas valve with magnetic drive can be found in the aforementioned DE 10107194 C1.
  • the current which flows through the coil of the magnetic drive is detected in a first or temporally preceding step.
  • This current profile after a drive to close the gas valve is monitored.
  • the detected current profile is further processed to check the functional state of the gas valve.
  • the detected current profile is compared with a schematic / theoretical current profile when closing with properly functioning gas valve or solenoid drive.
  • this can be done by direct comparison of the curves, wherein this schematic current profile of a properly functioning gas valve can be stored in a controller. This can also perform the comparison. It can be exploited that the current flow at properly functioning gas valve after an initial increase due to the self-induction in the coil by the moving magnetic drive or a piston or the like. in the solenoid after the first steep rise again slightly drops, but then rises again and reaches an asymptotic value. This may take, for example, 10 msec to 40 msec, advantageously about 20 msec.
  • the gas cooking appliance After detecting a mechanical blockage of the gas valve may advantageously be closed in the gas path to the gas burner another gas valve, so that no gas escapes. Furthermore, an alarm signal can be issued to an operator. It is also possible that the gas cooking appliance is then switched by its controller into a blocking mode which prevents the other gas valve or even one of the gas valves from being opened.
  • the current waveform has the jump down.
  • the top of the jump down or the maximum negative Value of the first derivative after the time can be about 8 ms to 15 ms.
  • the mentioned jump down in the course of the current may be about 5% to 30%. Thus, he himself is clearly visible.
  • the derived current waveform once derived after the time.
  • the aforementioned jump in the course of the current downwards then leads to negative values in the first derivative, ie at the slope of the curve of the current profile.
  • This negative value which only occurs when the gas valve functions properly, can then be very simply and very clearly recorded and evaluated by a control as the correct function of the gas valve. In the other case, so if the gas valve is blocked, this jump is missing down, so that the first derivative is always positive. In addition, this may be limited in time, if not within the aforementioned 3 msec to 25 msec after the start of the gas valve, the jump down.
  • a correct functioning of the gas valve is detected only in the event that in turn takes place after the negative values in the first time derivative of the detected current waveform, a jump up to a positive value. Accordingly, it can be provided for the course of the current itself that after the jump down again an increase must take place. Consequently, in the first derivative after the jump upwards, a slow fall to zero must occur.
  • a controller according to the invention for the gas valve or the aforementioned gas cooking appliance it may be provided to design current detection means in such a way that they detect the current through a coil of the gas valve.
  • the controller may have a microcontroller which is connected to the coil, wherein for this connection particularly advantageously an operational amplifier is provided.
  • the microcontroller can then perform the aforementioned comparisons or evaluation of the current profile and its first derivative with respect to time.
  • the microcontroller is designed to derive the detected current profile once after the time.
  • the said method can be provided for increasing the safety for each of the gas valves.
  • FIG. 1 shows a gas hob as gas cooking appliance according to the invention with a plurality of gas valves for individual gas burners and with a safety valve
  • FIG. 3 is a schematic circuit diagram of the control and monitoring of the safety valve of FIG. 2,
  • FIG. 5 shows the course of the current through the equivalent circuit diagram according to FIG.
  • Fig. 1 shows a schematic representation of a gas hob 1 1 as a gas cooking appliance according to the invention, which has a cooktop plate 12 with three gas burners 14a to 14c.
  • Each of the gas burners 14a to 14c has a gas valve 16a to 16c assigned to it for the gas inflow.
  • a supply line 18 is provided, which leads from the outside into the gas hob 1 1 and first goes to a safety valve 17. Thereafter, the supply line 18 'continues to three individual lines 19a to 19c, and these then lead to the gas valves 16a to 16c.
  • the gas hob 1 1 still controls 21 a to 21 c and a controller 22.
  • the controller 22 sets the commands that an operator can give with the controls 21 in control signals for the gas valves 16a to 16c and possibly also the safety valve 17 um. Furthermore, according to the invention, it monitors the current characteristics at the gas valves 16 and above all 17.
  • the safety valve 17 has a solenoid 24 as a solenoid, in which a magnetizable piston 26 is located. He carries at the end of a valve closure member 28 which rests on a valve seat 29 of the supply line 18 and seals it. If the solenoid coil 24 is activated or current flows through, it pulls the piston 26 inward or to the right in the dashed line position and the valve closure member 28 releases the valve seat 29, so that gas through the supply line 18 toward the second part 18 ' and the individual lines 19 can flow.
  • Fig. 3 is a circuit diagram for monitoring the mechanical function of the safety valve 17 and the magnetic drive is shown.
  • the operational amplifier OP Via the operational amplifier OP, the current I L , which flows through the magnetic coil 24, which is shown here for simplicity as a pure coil, amplified to a height of 0 to 5 V and to an input AD of a microcontroller of the controller 22 is given.
  • FIG. 4 is a simplified circuit diagram for illustrating a magnetic drive with solenoid 24 is shown.
  • the inductance L and the corresponding ohmic resistance R are shown, to which a voltage V is applied, together with a switch S for switching on.
  • the normal current profile i (t) is shown in FIG. 5, as can generally be found on an inductance or on a magnet coil without moving parts.
  • Fig. 6B is shown how it looks, when the piston 26 is blocked, and then admittedly not sure in which position it is blocked. But this is in any case a serious mistake or defect. Since the movement of the piston 26 is absent, a substantially pure current profile results through an inductance according to FIG. 5.
  • FIGS. 6A and 6B show the basic features of the invention that, by comparing the two current profiles, at least one fault condition of the blocking of the safety valve 17 can be reliably detected. It is also possible to check the time course, ie whether the low point or the peak is down at the expected time.
  • the first time derivative can be formed by the two curves of FIGS. 6A and 6B, which in turn is shown in FIGS. 7A and 7B. It can clearly be seen that in FIG. 7A, due to the steady increase, the first derivative after time, that is, the slope, is always positive. In Fig. 7B, this is different, and the slope of the curve at just under 6 msec is manifested in that the slope assumes negative values.
  • a test pin of the microcontroller of the controller 22 is connected to the bottom of the resistor.
  • a known current can be sent by the microcontroller. This leads to a certain voltage at the previously described terminal AD at the microcontroller, which fits to this current. This is the sign that the circuit according to FIG. 3 works correctly per se.
  • another security level can be installed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

L'invention concerne un procédé de surveillance d'un clapet de sécurité qui comporte un entraînement magnétique doté d'une bobine, comprenant les étapes suivantes. Tout d'abord, le courant circulant dans la bobine est détecté et le parcours de courant est surveillé après une commande de fermeture du clapet à gaz. Ensuite, le parcours de courant détecté est retraité aux fins de surveillance de l'état fonctionnel de la vanne à gaz. A cet effet, il est possible de former sa première dérivation qui peut être plus facile à évaluer.
EP13774626.9A 2012-10-09 2013-09-26 Procédé de surveillance d'une vanne à gaz, commande d'une vanne à gaz, et réchaud au gaz Withdrawn EP2906877A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012218393.0A DE102012218393A1 (de) 2012-10-09 2012-10-09 Verfahren zur Überwachung eines Gasventils, Steuerung für ein Gasventil und Gaskochgerät
PCT/EP2013/070090 WO2014056727A1 (fr) 2012-10-09 2013-09-26 Procédé de surveillance d'une vanne à gaz, commande d'une vanne à gaz, et réchaud au gaz

Publications (1)

Publication Number Publication Date
EP2906877A1 true EP2906877A1 (fr) 2015-08-19

Family

ID=49328503

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13774626.9A Withdrawn EP2906877A1 (fr) 2012-10-09 2013-09-26 Procédé de surveillance d'une vanne à gaz, commande d'une vanne à gaz, et réchaud au gaz

Country Status (4)

Country Link
EP (1) EP2906877A1 (fr)
CN (1) CN104781608A (fr)
DE (1) DE102012218393A1 (fr)
WO (1) WO2014056727A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2668231B1 (es) * 2016-11-16 2019-02-25 Copreci S Coop Aparato de gas
WO2018103918A1 (fr) * 2016-12-08 2018-06-14 Robert Bosch Gmbh Procédé et dispositif de test d'une valve électromagnétique à la recherche d'un dysfonctionnement
ES2731680A1 (es) * 2018-05-16 2019-11-18 Bsh Electrodomesticos Espana Sa Dispositivo de aparato de coccion a gas
DE102019211286A1 (de) * 2019-07-30 2021-02-04 BSH Hausgeräte GmbH System und Verfahren zur Überwachung des Zustands eines Magnetschalters

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000060220A1 (fr) * 1999-03-30 2000-10-12 Siemens Aktiengesellschaft Procede permettant de determiner la position d'un induit
WO2003001650A1 (fr) * 2001-06-22 2003-01-03 Minebea Co., Ltd. Flasque conçu pour un moteur electrique, en particulier pour un moteur a courant continu a commutation electronique
EP1302952A2 (fr) * 2001-10-12 2003-04-16 Schultz, Wolfgang E., Dipl.-Ing. Procédé et circuit pour la détection de la position de l'armature d'un électroaimant
DE102004028054A1 (de) * 2004-06-09 2005-12-29 Linde Ag Elektro-magnetisch betätigtes Steuerventil
EP2273198A2 (fr) * 2009-07-01 2011-01-12 BSH Bosch und Siemens Hausgeräte GmbH Appareil de cuisson au gaz doté d'un accumulateur d'énergie électrique

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DE10107194C1 (de) * 2001-02-16 2002-06-06 Heatec Thermotechnik Gmbh Stromsparendes Gasventil
US7467639B2 (en) * 2003-03-28 2008-12-23 General Electric Company Systems and methods for controlling gas flow
DE102004029991B3 (de) * 2004-06-21 2005-09-15 Karl Dungs Gmbh & Co. Kg Ventilanordnung
CN100437408C (zh) * 2006-01-19 2008-11-26 北京化工大学 脉码调制和脉宽调制混合模式流量调节系统及调节方法
DE102006043608A1 (de) * 2006-09-16 2008-03-27 Continental Aktiengesellschaft Verfahren zur Steuerung und/oder Regelung des Niveaus eines Fahrzeugaufbaus eines Kraftfahrzeuges
JP4431996B2 (ja) * 2007-07-09 2010-03-17 Ｓｍｃ株式会社 電磁弁駆動回路及び電磁弁
CN101359228B (zh) * 2008-09-09 2011-04-20 张东来 基于驱动端电流变化的电磁控制元件故障诊断方法及装置
CN201277618Y (zh) * 2008-09-28 2009-07-22 樱花卫厨（中国）股份有限公司 燃气灶电磁阀检测装置
US10240785B2 (en) * 2010-01-28 2019-03-26 Noritz Corporation Driving method for solenoid valve, solenoid valve driving apparatus, and combustion apparatus including same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000060220A1 (fr) * 1999-03-30 2000-10-12 Siemens Aktiengesellschaft Procede permettant de determiner la position d'un induit
WO2003001650A1 (fr) * 2001-06-22 2003-01-03 Minebea Co., Ltd. Flasque conçu pour un moteur electrique, en particulier pour un moteur a courant continu a commutation electronique
EP1302952A2 (fr) * 2001-10-12 2003-04-16 Schultz, Wolfgang E., Dipl.-Ing. Procédé et circuit pour la détection de la position de l'armature d'un électroaimant
DE102004028054A1 (de) * 2004-06-09 2005-12-29 Linde Ag Elektro-magnetisch betätigtes Steuerventil
EP2273198A2 (fr) * 2009-07-01 2011-01-12 BSH Bosch und Siemens Hausgeräte GmbH Appareil de cuisson au gaz doté d'un accumulateur d'énergie électrique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2014056727A1 *

Also Published As

Publication number Publication date
WO2014056727A1 (fr) 2014-04-17
CN104781608A (zh) 2015-07-15
DE102012218393A1 (de) 2014-04-10

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