SE509220C2 - A method for detecting a flame when starting an auxiliary heater - Google Patents
A method for detecting a flame when starting an auxiliary heaterInfo
- Publication number
- SE509220C2 SE509220C2 SE9500366A SE9500366A SE509220C2 SE 509220 C2 SE509220 C2 SE 509220C2 SE 9500366 A SE9500366 A SE 9500366A SE 9500366 A SE9500366 A SE 9500366A SE 509220 C2 SE509220 C2 SE 509220C2
- Authority
- SE
- Sweden
- Prior art keywords
- time
- voltage
- measuring
- glow
- heater
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H1/2203—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from burners
- B60H1/2206—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from burners controlling the operation of burners
-
- 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
- F23N5/14—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermo-sensitive resistors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H2001/2246—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant obtaining information from a variable, e.g. by means of a sensor
- B60H2001/2256—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant obtaining information from a variable, e.g. by means of a sensor related to the operation of the heater itself, e.g. flame detection or overheating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H2001/2268—Constructional features
- B60H2001/2271—Heat exchangers, burners, ignition devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/22—Timing network
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2227/00—Ignition or checking
- F23N2227/28—Ignition circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2227/00—Ignition or checking
- F23N2227/38—Electrical resistance ignition
-
- 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
- F23N2241/00—Applications
- F23N2241/14—Vehicle heating, the heat being derived otherwise than from the propulsion plant
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Combustion (AREA)
- Air-Conditioning For Vehicles (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
Description
10 15 20 25 30 35 40 509 220 2 värmaren som helhet ger en väsentlig kostnadssänkning i förhållande till förut kända utföranden med en separat flamdetekteringsanordning. 10 15 20 25 30 35 40 509 220 2 the heater as a whole provides a significant cost reduction compared to prior art designs with a separate fl am detection device.
Tilläggstiden är företrädesvis mellan cirka 10 och 200% av det första tidsintervallet TI. Väntetiden T4 ligger företrädesvis mellan 5 och 20 sekunder.The additional time is preferably between about 10 and 200% of the first time interval TI. The waiting time T4 is preferably between 5 and 20 seconds.
Tillförlitligheten i förfarandet enligt uppfinningen kan höjas ytterligare, kombinerat med en reducerad energiförbrukning för att åstadkomma glödtemperaturen och en ökad livslängd för den kombinerade glöd- och flamdetekteringsanordningen, genom att glödtem- perat1n°en regleras på ett konstant värde genom att glödspänningen påverkas under tids- intervallet TS.The reliability of the process according to the invention can be further increased, combined with a reduced energy consumption to achieve the annealing temperature and an increased service life of the combined glow and fl detection device, by The temperature is regulated at a constant value by the glow voltage being affected during the interval TS.
Vid förfarandet enligt uppfinningen används företrädesvis ett keramiskt glödstift med PPC-egenskaper.In the process according to the invention, a ceramic glow plug is preferably used with PPC properties.
Det ñnns två sätt att övervaka flamman när den väl bildats. Enligt det ena altemati- vet ligger mätspänningen UM (eller en mätström IM) på kontinuerligt från väntetidens T4 utgång fram till dess att värmaren stängs av. Enligt det andra altemativet läggs mät- strömmen UM respektive mätströmmen IM på under regelbundna mätintervall T5, som skiljs åt av mätpauser TS, från väntetidens utgång fram till dess att värmaren stängs av.There are two ways to monitor the breastfeeding once it is formed. According to one alternative know, the measuring voltage UM (or a measuring current IM) is on continuously from the waiting time T4 output until the heater is switched off. According to the second alternative, current UM and measuring current IM, respectively, during regular measuring intervals T5, which separated by measuring pauses TS, from the end of the waiting time until the heater is switched off.
Uppfinningen kommer nu att förklaras närmare med ledning av ett på ritningen visat utföringsexempel. Därvid visar fig 1 huvudpartiet av en förgasningsbrännare med en glöd- och flam detekteringsanordning och med schematiskt visade kopplingselement, och fig 2 ett diagram som visar spänningens förlopp som funktion av tiden för den integrerade tänd- och flamdetekteringsanordningen.The invention will now be explained in more detail with reference to one in the drawing shown embodiment. In this case, fi g 1 shows the main part of a gasification burner with a glow and fl am detection device and with schematically shown coupling elements, and fi g 2 a diagram showing the course of the voltage as a function of the time of the integrated the ignition and flame detection device.
Förgasningsbrännaren som helhet betecknas med 1. I fig 1 visas en längdgenomskär- ning genom brännarens huvudparti. Detta innehåller en absorberande kropp 2, som be- gränsar den ena änden av en i ett brännrör 3 belägen brännkammare 4. Den absorberande kroppens 2 baksida ståri förbindelse med en bränsleledning 5, genom vilken kroppen 2 tillförs flytande bränsle av en icke visad pump. Bränslet fórgasas på kroppens 2 mot brännkammaren vända sida och antänds av en som helhet med 6 betecknad tändanord- ning. De aggregat som tillför förbränningslufi till brännkammaren visas inte på ritningen emedan de saknar betydelse för förståelsen av uppfinningen.The gasification burner as a whole is denoted by 1. In fi g 1 a longitudinal section is shown. through the main portion of the burner. This contains an absorbent body 2, which is adjoins one end of a combustion chamber 4 located in a combustion tube 3. The absorbent the rear of the body 2 is connected to a fuel line 5, through which the body 2 surface fuel is supplied by a pump (not shown). The fuel is gasified on the body's 2 mot the combustion chamber side and is ignited by an ignition device as a whole with 6 ning. The units that supply combustion fuel to the combustion chamber are not shown in the drawing because they are irrelevant to the understanding of the invention.
Tändanordningen 6 bildas av ett keramiskt glödstift 7, vars i brännkammaren 4 in- skjutande del bildas av en i en omgivande keramisk massa 9 inbäddad glödspiral 8. Glöd- stiftet 7 har en positiv temperaturkoefficient (PTC-egenskap), dvs. när temperaturen stiger i brännkammaren ökar glödstiftets elektriska motstånd. Under tändningsförloppet matas tändanordningen 6 med en glödspänning UG, som tillförs till tändanordningen från en spänningskälla via en av ett glödspänningsrelä 10 manövrerad reläkontakt 10A. Glödspän- ningsreläet 10 manövreras av en styrenhet 11, som samtidigt också fungerar som signal- behandlingsanordning för det keramiska glödstiftets motstånd.The ignition device 6 is formed by a ceramic glow plug 7, the combustion chamber 4 of which sliding part is formed by an annealing coil 8 embedded in a surrounding ceramic mass 9. pin 7 has a positive temperature coefficient (PTC property), ie. when the temperature rises in the combustion chamber, the electrical resistance of the glow plug increases. During the ignition process is fed the igniter 6 with a glow voltage UG, which is applied to the igniter from a voltage source via a relay contact 10A operated by an incandescent voltage relay 10. Glow plug The relay 10 is operated by a control unit 11, which at the same time also functions as a signal treatment device for the resistance of the ceramic glow plug.
I fig 2 anges den med T betecknade tiden längs x-axeln från tidpunkten noll vid värmarens start. Som y-värden anges dels glödspänningen UG och dels mätspänningen UM. Av diagrammet framgår att eflzer värmarens start läggs först en glödspänning UG över tändanordningen 6 under en tidsperiod Ta. Spänningen tillförs genom att styrenheten 11 via den i fig 1 visade signalledningen bringar glödspänningsreläet 10 att sluta reläkontak- 10 15 20 509 220 3 ten 10A. Tidsperioden 'P3 har ett första tidsintervall TI, som bestäms empiriskt på sådant sätt att ett statistiskt medelvärde erhålles för ett bestämt antal värmare under naturliga driftförhàllanden med beaktande av en viss variationsbredd. Efter det första tidsinterval- let följer en tillläggstid i form av ett andra tidsintervall T2, som har ett värde av cirka 10 till 200%, företrädesvis cirka 150%, av det första tidsintervallet TI. Tidsperioden Ta av- slutas med att glödspänningen UG sänks till noll. Detta sker genom att en styrpuls från styrenheten 11 bringar glödspänningsreläet 10 att öppna reläkontakten 10A i fig 1.In fi g 2, the time denoted by T is given along the x-axis from the time zero at heater start. The y-values are partly the glow voltage UG and partly the measuring voltage UM. The diagram shows that the start of the heater first puts a glow voltage UG over ignition device 6 for a period of time Ta. The voltage is supplied by the control unit 11 via the signal line shown in fi g 1 causes the glow voltage relay 10 to close the relay contact 10 15 20 509 220 3 ten 10A. The time period 'P3 has a first time interval TI, which is determined empirically on such means that a statistical mean value is obtained for a certain number of heaters below natural operating conditions taking into account a certain range. After the first time interval let follows an additional time in the form of a second time interval T2, which has a value of about 10 to 200%, preferably about 150%, of the first time interval TI. Time period Take off ends with the glow voltage UG being reduced to zero. This is done by a control pulse from the control unit 11 causes the glow voltage relay 10 to open the relay contact 10A in fi g 1.
Med tilläggstiden T2 inräknad är tiden Ta så lång att samtliga värmare som inte drabbats av en störning startar under denna tid.Including the additional time T2, the time Ta is so long that all heaters do not affected by a disturbance starts during this time.
Efter tidsperiodens TS slut följer en väntetid T4 under vilken ingen spänning tillförs till tändanordningen 6. Eftersom flamman skall ha bildats senast vid tidsperiodens Ta slut får den under väntetiden T4 tillräcklig tid för att påverka det keramiska glödstiftets 7 temperatur, och därmed motståndet RM, i förhållande till glödfasen. Efter väntetidens T4 slut tillförs en mätspänning UM till tändanordningen 6 från en konstantspänningskälla.After the end of the time period TS, a waiting time T4 follows during which no voltage is applied to the ignition device 6. Since the fl breast must have been formed at the latest at the end of the time period during the waiting time T4, it is given sufficient time to influence the ceramic glow plug 7 temperature, and thus the resistance RM, in relation to the glow phase. After the waiting time T4 finally, a measuring voltage UM is applied to the ignition device 6 from a constant voltage source.
Detta åstadkommes genom att en styrpuls från styrenheten 11 bringar ett i fig 1 med 12 betecknat mätspänningsrelä att sluta en reläkontakt 12A. Det keramiska glödstiftets 7 elektriska motstånd RM påverkas av temperaturen i brännkammaren 4 så att den som signalbehandlingsanordning fungerande styrenheten 11 ur spänningsändringen entydigt kan avgöra om det finns eller inte finns en flamma i brännkammaren 4. Den efter inter- vallets T4 slut pålagda mätspänningen UM kan vara kontinuerlig för att åstadkomma en kontinuerlig övervakning av flamman (prickstreckad linje i fig 2), eller kopplas till och från periodiskt av styrenheten 11 med hjälp av mätspänningsreläet 12, så att det bildas mätintervall TS med mellanliggande mätpauser TG.This is achieved by a control pulse from the control unit 11 bringing an i fi g 1 by 12 designated measuring voltage relay to close a relay contact 12A. The ceramic glow plug 7 electrical resistance RM is affected by the temperature in the combustion chamber 4 so that it as signal processing device operating the control unit 11 from the voltage change unambiguously can determine whether or not there is a breastfeeding in the combustion chamber 4. It after inter- the measuring voltage UM applied to the end of the wall T4 can be continuous to produce one continuous monitoring of the flame (dotted line in fi g 2), or connected to and from periodically by the control unit 11 by means of the measuring voltage relay 12, so that it is formed measuring interval TS with intermediate measuring breaks TG.
Claims (7)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4405315A DE4405315C1 (en) | 1994-02-19 | 1994-02-19 | Flame-detection method for liquid-fuelled heater |
Publications (3)
Publication Number | Publication Date |
---|---|
SE9500366D0 SE9500366D0 (en) | 1995-02-01 |
SE9500366L SE9500366L (en) | 1995-08-20 |
SE509220C2 true SE509220C2 (en) | 1998-12-21 |
Family
ID=6510639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9500366A SE509220C2 (en) | 1994-02-19 | 1995-02-01 | A method for detecting a flame when starting an auxiliary heater |
Country Status (4)
Country | Link |
---|---|
JP (1) | JPH07315038A (en) |
KR (1) | KR950031579A (en) |
DE (1) | DE4405315C1 (en) |
SE (1) | SE509220C2 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19622126C2 (en) * | 1996-06-01 | 2003-01-16 | Webasto Thermosysteme Gmbh | Method for ignition and / or flame monitoring in a vehicle heater |
DE19625823C2 (en) * | 1996-06-28 | 1998-07-02 | Webasto Thermosysteme Gmbh | Flame monitoring method for a vehicle heater |
DE19649473C2 (en) * | 1996-11-29 | 1999-01-07 | Webasto Thermosysteme Gmbh | Method of monitoring the flame in a fuel powered heater |
EP0845638B1 (en) * | 1996-11-29 | 2004-10-20 | WEBASTO THERMOSYSTEME GmbH | Ignition system for a fuel fired heater |
DE19709091C1 (en) * | 1997-03-06 | 1998-05-14 | Honeywell Bv | Flame monitoring circuit for gas burner |
DE10162321A1 (en) * | 2001-12-18 | 2003-07-10 | Nanogate Technologies Gmbh | flame monitoring |
DE102006049113B4 (en) * | 2006-10-18 | 2012-06-21 | Webasto Ag | Method for checking and setting an ignition device |
DE102014117115A1 (en) * | 2014-11-23 | 2016-05-25 | Webasto SE | evaporator assembly |
CN110430623B (en) * | 2019-07-09 | 2022-02-01 | 广东美的厨房电器制造有限公司 | Heating method and heating device of oxygen sensor |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE8619295U1 (en) * | 1986-07-18 | 1987-08-27 | Webasto-Werk W. Baier GmbH & Co, 8035 Gauting | Ignition device for a fuel-fired heater |
-
1994
- 1994-02-19 DE DE4405315A patent/DE4405315C1/en not_active Expired - Fee Related
-
1995
- 1995-02-01 SE SE9500366A patent/SE509220C2/en not_active IP Right Cessation
- 1995-02-17 JP JP7029377A patent/JPH07315038A/en active Pending
- 1995-02-18 KR KR1019950003115A patent/KR950031579A/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
DE4405315C1 (en) | 1995-07-27 |
SE9500366D0 (en) | 1995-02-01 |
SE9500366L (en) | 1995-08-20 |
JPH07315038A (en) | 1995-12-05 |
KR950031579A (en) | 1995-12-18 |
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