SI21858A - Procedure for determining and controlling the temperature of a sparking plug - Google Patents

Procedure for determining and controlling the temperature of a sparking plug Download PDF

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Publication number
SI21858A
SI21858A SI200400212A SI200400212A SI21858A SI 21858 A SI21858 A SI 21858A SI 200400212 A SI200400212 A SI 200400212A SI 200400212 A SI200400212 A SI 200400212A SI 21858 A SI21858 A SI 21858A
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SI
Slovenia
Prior art keywords
temperature
sparking
voltage
sparking plug
plug
Prior art date
Application number
SI200400212A
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Slovenian (sl)
Inventor
Urban Simoncic
Damjan Golob
Robert Kovacic
Mark Plesko
Original Assignee
Cosylab, D.O.O.
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 Cosylab, D.O.O. filed Critical Cosylab, D.O.O.
Priority to SI200400212A priority Critical patent/SI21858A/en
Priority to EP05759454A priority patent/EP1787022A1/en
Priority to PCT/SI2005/000022 priority patent/WO2006009523A1/en
Publication of SI21858A publication Critical patent/SI21858A/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
    • F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
    • F02P19/025—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs with means for determining glow plug temperature or glow plug resistance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2024—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit the control switching a load after time-on and time-off pulses
    • F02D2041/2027—Control of the current by pulse width modulation or duty cycle control

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

Subject of the invention is a temperature control of the sparking plug, where the measured voltage between the electrode (2) and the heating tube (3) is used for adjusting the electric power, which is supplied to the sparking part of the sparking plug. The sparking plug is preferably connected to a source of pulse-width modulated voltage. By changing the pulse width or their period, the average electric heating power is changed. The voltage between the electrodes and the heating tube is measured during the time, when the supply voltage is not attached to the sparking plug. Via this voltage the temperature of the sparking part of the sparking plug is determined, because the assessed voltage mostly represents thermal voltage of the sparking part of the sparking plug, when the former is hot. The described sparking plug heating method provides the possibility that a constant temperature of the sparking part of the sparking plug is maintained without knowing anything about its cooling and heating characteristics. This results in the controller to receive commands only for switching on and off as well as eventually in the given moment data on the required sparking plug temperature. It is not necessary to send the controller data on the operation mode, which could be used to determine the required heating power of the sparking part for maintaining a certain temperature. Since it is not necessary to send this data, it is also not necessary to assess its impact and the heating of the sparking plug.

Description

POSTOPEK DOLOČANJA IN REGULACIJE TEMPERATURE ŽARILNE SVEČKEPROCEDURE FOR DETERMINING AND REGULATING THE TEMPERATURE OF THE Glow plug

Področje tehnikeThe field of technology

Izum sodi v področje pomožnih sredstev za vžig dizelskih motorjev, določneje v področje krmiljenja žarilnih svečk za zagon hladnega dizelskega motorja.The invention relates to the field of auxiliary means for igniting diesel engines, in particular to the control of glow plugs for starting a cold diesel engine.

Tehnični problemA technical problem

Zastavljeni tehnični problem je krmiljenje žarilne svečke, pri katerem se s pomočjo izmerjene električne napetosti med elektrodo in grelno cevko ugotavlja temperatura žarilnega dela svečke, na podlagi tako ugotovljene temperature žarilnega dela svečke pa se nastavlja električna moč, ki se dovaja žarilni svečki. Cilj izuma je poenostavitev regulacije temperature žarilne svečke, zmanjšanje odstopanja temperature žarilnega dela svečke od ciljne temperature in ohranitev preproste konstrukcije žarilne svečke ali njena poenostavitev.The stated technical problem is the control of the glow plug, in which the measured voltage of the electrode and the heating tube determines the temperature of the glow plug part, and on the basis of the determined glow plug temperature, the electric power supplied to the glow plug is adjusted. The aim of the invention is to simplify the regulation of the glow plug temperature, to reduce the deviation of the glow plug part temperature from the target temperature, and to maintain or simplify the glow plug structure.

Znano stanje tehnikeThe prior art

Delovanje žarilnih svečk, ki v dizelskem motorju omogočajo samovžig goriva, dokler motor ni dovolj segret, v splošnem določa krmilnik žarilnih svečk. Ta je lahko preprosto stikalo, ki žarilne svečke priklopi na napajanje, ko se zahteva njihovo delovanje, in jih izklopi, ko njihovo delovanje ni več potrebno. V tem primeru morajo biti svečke samoregulacijske. Na temperaturo žarilne svečke močno vplivajo razni dejavniki. Napajalna napetost, ki določa dovedeno moč svečkam, se lahko precej spreminja. Tudi ohlajanje svečk je v različnih režimih delovanja motorja zelo različno. Noben od omenjenih dejavnikov pri najbolj enostavnem krmilniku ni kompenziran. Svečke zato običajno nimajo optimalne temperature. Zaradi prenizke temperature žarilnih svečk ni ustreznih pogojev za pravočasen samovžig. To ima za posledico slabše izgorevanje, večje onesnaževanje, večjo porabo goriva, manjšo moč motorja, večjo obrabo motornih delov in podobno. Če pa imajo svečke previsoko temperaturo, porabljajo več električne energije, kot bi jo pri optimalni temperaturi, pa tudi degradacija svečk je opazno večja. Da bi svečke vedno delovale na optimalni temperaturi, se pri boljših krmilnikih regulira dovedena električna moč. Pri regulaciji se poskuša upoštevati čim več dejavnikov, ki vplivajo na temperaturo žarilnega dela svečke. Nekatere vplivne dejavnike lahko krmilnik enostavno sam izmeri in ustrezno kompenzira. To velja na primer za spreminjajočo se napajalno napetost. Podatke o režimu delovanja motorja pa morajo krmilniku posredovati druge naprave. S tem se obremenjujejo komunikacijske linije, zapleta programje ter poveča možnost za napake, poleg tega je pri razvoju motorja potrebno veliko dela, da se izmeri, kakšno je ohlajanje svečk v vseh relevantnih režimih delovanja motorja.The performance of glow plugs, which allow the diesel engine to auto-ignite until the engine is sufficiently warm, is generally determined by the glow plug controller. This may be a simple switch that plugs the glow plugs into power when their operation is required and switches them off when they are no longer needed. In this case, the spark plugs should be self-regulating. The temperature of the glow plug is strongly influenced by various factors. The supply voltage that determines the power supply to the spark plugs can vary considerably. The spark plug cooling is also very different in different engine modes. None of the factors mentioned in the simplest controller is compensated for. Therefore, the spark plugs usually do not have the optimum temperature. Due to the low temperature of the glow plugs, the conditions for timely auto-ignition are not suitable. This results in worse combustion, higher pollution, higher fuel consumption, lower engine power, greater wear on the engine parts and the like. However, if the spark plugs are too high, they consume more electricity than they would at the optimum temperature, and the degradation of the spark plugs is noticeably higher. In order to keep the spark plugs operating at the optimum temperature, the better controllers regulate the power input. The regulation attempts to take into account as many factors as possible that affect the temperature of the glow plug part. Some influencing factors can be easily measured and compensated by the controller itself. This applies, for example, to changing supply voltage. However, information on the mode of operation of the engine must be provided to the controller by other devices. This puts a strain on communication lines, complicates software, and increases the possibility of errors, and it takes a lot of work to develop the engine to measure how cool the spark plugs are in all relevant engine modes.

Patenta JP59068569 in JP56066456 obravnavata merjenje temperature žarilnega dela z merjenjem termične napetosti na senzorju, ki je vgrajen v žaril no svečko. S takšnimi namenskimi senzorji s termočleni se sicer temperatura lahko meri zelo natančno, vendar je rešitev draga zaradi integracije dodatnega termočlena v žarilni del svečke in razvoda električnih priključitev zanj. Vse to v rešitvi po pričujočem izumu ni potrebno, poleg tega je mogoče rešitev po izumu uporabiti tudi na obstoječih modelih in tipih svečk.Patents JP59068569 and JP56066456 address the measurement of the temperature of a glow plug by measuring the thermal voltage on a sensor built into the glow plug. With such dedicated thermocouple sensors, the temperature can be measured very accurately, but the solution is costly because of the integration of the additional thermocouple into the spark plug part and the electrical connection to it. All this is not necessary in the solution of the present invention, and the solution according to the invention can also be used on existing models and types of spark plugs.

Opis izumaDescription of the invention

Bistvo izuma je v tem, da se dovedena moč svečki regulira glede na termično napetost, ki nastane na spojih med različnimi materiali na žarilnem delu, ne glede na to, kako in s čim se omenjena termična napetost meri, in da se termična napetost na žarilnem delu prednostno meri tako, da se meri napetost med elektrodo in grelno cevko. Z izrazom termična napetost je v tem opisu izuma imenovana električna napetost, ki se pojavi v tokokrogu, ki ga sestavljajo vodniki iz različnih materialov in pri katerem so spoji med vodniki na različnih temperaturah.The essence of the invention is that the power supply of the spark plug is controlled by the thermal stress generated at the joints between different materials on the filament, regardless of how and by what said thermal voltage is measured, and that the thermal voltage at the filament it preferably measures the part by measuring the voltage between the electrode and the heating tube. In this specification, the term thermal voltage is referred to as an electrical voltage that occurs in a circuit consisting of conductors of different materials and at which the joints between the conductors are at different temperatures.

Krmiljenje žarilne svečke z merjenjem termične napetosti njenega žarilnega dela po izumu je v nadaljevanju opisano s pomočjo slike 1, ki prikazuje vzdolžni prerez žarilne svečke.The control of a glow plug by measuring the thermal voltage of its glow portion according to the invention is described below by means of Figure 1, which shows a longitudinal cross-section of a glow plug.

Pri regulaciji električne moči gretja žarilne svečke se meri termična napetost, ki se pojavlja predvsem na žarilnem delu žarilne svečke. Iz velikosti termične napetosti se ugotovi temperatura konice žarilnega dela svečke. Na podlagi tako ugotovljene temperature žarilnega dela svečke in na podlagi znane ciljne temperature krmilnik ustrezno regulira električno moč gretja. Za nastavitev ustrezne električne moči gretja se prednostno uporablja pulzna modulacija, to pomeni, da se tok, ki povzroča segrevanje svečke izmenično vklaplja in izklaplja, kar je znano že iz dosedanjih rešitev. Pri načinu krmiljenja žarilne svečke po pričujočem izumu se izkorišča čas med pulzi, ko je stikalo zaprto, za merjenje napetosti med elektrodo in grelno cevko. Z izbiro širine pulzov ali njihove periode se lahko nastavi povprečna moč, ki jo svečka prejema. Potrebna moč se določi na podlagi ugotovljene temperature žarilnega dela svečke in znane ciljne temperature tega dela. Žarilni del 1 svečke je na izrazito visoki temperaturi glede na ostale dele, kadar je žarilna svečka v delovnem temperaturnem območju. Zato so termične napetosti, ki se pojavijo na spojih različnih kovin v žarilnem delu svečke, bistveno večje kot vse druge termične napetosti, ki se pojavijo na vseh spojih v tokokrogu, ki se tvori, kadar se meri napetost med elektrodo 2 in grelno cevko 3. V žarilnem delu 1 svečke je običajno več različnih spojev kovin. Rešitev po izumu deluje enako pri poljubnem številu elementov in spojev v svečki. Vedno obstojata spoj 6 med grelno cevko in grelnim elementom 5, ki je običajno žarilna spirala, ter spoj med grelnim elementom 5 in elektrodo 8 svečke. Običajno je med grelnim elementom 5 in elektrodo 2 zaviralni upor 4, ki je iz drugačne snovi, in tedaj obstoja še spoj 7. Velikost termične napetosti, ki se pojavi na posameznem spoju, je odvisna od temperature in od sestave obeh materialov. S primerno izbiro materialov se doseže, da se napetosti na vseh spojih med seboj ne izničijo.When regulating the electric power of the glow plug heating, the thermal voltage is measured, which occurs mainly on the glow plug part of the glow plug. The magnitude of the thermal voltage determines the tip temperature of the glow plug part. Based on the thus determined temperature of the glow plug part and the known target temperature, the controller regulates the electric heating power accordingly. Pulse modulation is preferably used to adjust the appropriate electric heating power, which means that the current that causes the spark plug to warm up is switched on and off alternately, as is known from previous solutions. In the method of controlling a glow plug according to the present invention, the time between pulses when the switch is closed is used to measure the voltage between the electrode and the heating tube. By selecting the pulse width or their period, the average power the candle receives can be set. The required power is determined on the basis of the determined temperature of the glow plug part and the known target temperature of that part. The glow plug part 1 is at a particularly high temperature relative to the other parts when the glow plug is in the operating temperature range. Therefore, the thermal stresses that occur on the joints of different metals in the glow plug portion are significantly greater than all other thermal stresses that occur on all the joints in the circuit formed when the voltage between electrode 2 and the heating tube 3 is measured. In the glowing part 1 of the spark plug there are usually several different metal joints. The solution according to the invention works the same for any number of elements and joints in the spark plug. There is always a junction 6 between the heating tube and the heating element 5, which is usually the filament coil, and the connection between the heating element 5 and the spark plug electrode 8. Typically, between the heating element 5 and the electrode 2, there is a braking resistor 4 made of a different substance and then there is a joint 7. The magnitude of the thermal stress that occurs at each junction depends on the temperature and the composition of the two materials. Proper selection of materials ensures that the stresses on all joints do not cancel out.

Izvedbeni primer 1Example 1

Meritve na svečkah, ki so v prosti prodaji kot nadomestni deli in niso namenjene regulaciji s pomočjo merjenja termične napetosti, so pokazale, da materiali, uporabljeni pri teh svečkah, omogočajo regulacijo s pomočjo merjenja termične napetosti, saj je bila izmerjena termična napetost na svečki pri 1000 °C okrog 20 mV. To napetost ni bilo težko meriti in gretje svečke se je lahko reguliralo tako, da je bila temperatura konstantna pri različnih odvodih toplote.Measurements on spark plugs, which are commercially available as spare parts and are not intended to be regulated by thermal voltage measurement, have shown that the materials used in these spark plugs allow regulation by thermal voltage measurement since the thermal voltage at the spark plugs at 1000 ° C around 20 mV. This voltage was not difficult to measure and the heating of the spark plug could be regulated so that the temperature was constant at different heat sinks.

Claims (3)

1. Postopek določanja in regulacije temperature žarilne svečke, za katerega je značilno, da se v postopku določanja temperature žarilne svečke merijo termične napetosti žarilnega dela (1) svečke in da se termična napetost naA method of determining and regulating the temperature of a glow plug, characterized in that, in the process of determining the temperature of the glow plug, the thermal voltages of the glow plug portion (1) are measured and the thermal voltage at 5 žarilnem delu (1) prednostno meri tako, da se meri napetost med elektrodo (2) in grelno cevko (3).5 preferably measures the filament portion (1) by measuring the voltage between the electrode (2) and the heating tube (3). 2. Postopek določanja in regulacije temperature žarilne svečke po zahtevku 1, za katerega je značilno, da se žarilnem delu (1) svečke nastavi dovedena moč glede na zahtevano temperaturo in glede na temperaturo, določeno prek2. A method of determining and regulating the temperature of a spark plug according to claim 1, characterized in that the glowing part (1) of the spark plug is adjusted to the required power according to the required temperature and according to the temperature determined by 10 merjenja termične napetosti žarilnega dela.10 measuring the thermal voltage of the filament. 3. Postopek določanja in regulacije temperature žarilne svečke po zahtevku 2, za katerega je značilno, da se moč, dovedena žarilnem delu (1) svečke, nastavi tako, da se napajanje žarilnega dela (1) pulzno modulira in da se razmerje med širino pulza in periodo pulzov spreminja.3. A method for determining and regulating the temperature of a glow plug according to claim 2, characterized in that the power supplied to the glowing part (1) of the spark plug is adjusted so that the supply of the glowing part (1) is pulse modulated and the pulse width ratio and the pulse period varies. 15 4. Postopek določanja in regulacije temperature žarilne svečke po zahtevku 3, za katerega je značilno, da se napetost med elektrodo (2) in grelno cevko (3) meri v času med pulzi, ko je napajanje žarilnega dela (1) svečke izklopljeno.The method of determining and regulating the temperature of a glow plug according to claim 3, characterized in that the voltage between the electrode (2) and the heating tube (3) is measured in the time between pulses when the power of the glow plug part (1) is switched off.
SI200400212A 2004-07-19 2004-07-19 Procedure for determining and controlling the temperature of a sparking plug SI21858A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SI200400212A SI21858A (en) 2004-07-19 2004-07-19 Procedure for determining and controlling the temperature of a sparking plug
EP05759454A EP1787022A1 (en) 2004-07-19 2005-07-19 Method for determining and regulating the glow plug temperature
PCT/SI2005/000022 WO2006009523A1 (en) 2004-07-19 2005-07-19 Method for determining and regulating the glow plug temperature

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SI200400212A SI21858A (en) 2004-07-19 2004-07-19 Procedure for determining and controlling the temperature of a sparking plug

Publications (1)

Publication Number Publication Date
SI21858A true SI21858A (en) 2006-02-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
SI200400212A SI21858A (en) 2004-07-19 2004-07-19 Procedure for determining and controlling the temperature of a sparking plug

Country Status (3)

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EP (1) EP1787022A1 (en)
SI (1) SI21858A (en)
WO (1) WO2006009523A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1933025A1 (en) * 2006-12-16 2008-06-18 GM Global Technology Operations, Inc. A system and method for controlling resistive loads with ground return connected to the engine ground
DE102008035039B4 (en) 2008-07-26 2011-08-25 Beru AG, 71636 Method for energizing a glow plug
EP2224124A1 (en) * 2009-02-27 2010-09-01 Robert Bosch GmbH A glow plug controller for vehicles
GB201318748D0 (en) * 2013-08-24 2013-12-04 Bayram Peter J A Glo-plugged 4-stroke hybrid diesel engine with active glo-plug technology

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5493734A (en) * 1978-01-04 1979-07-25 Ngk Spark Plug Co Ltd Heating apparatus for combustion chamber of internal combustion engine
JPS5968569A (en) * 1982-10-14 1984-04-18 Nissan Motor Co Ltd Preheating control device of diesel engine
YU115584A (en) * 1984-07-02 1987-06-30 Iskra Sozd Elektro Indus Circuit for automatic controlled glowing device
DE3738055A1 (en) * 1987-11-09 1989-05-18 Siemens Ag Method for controlling the temperature of glow plugs in diesel engines and circuit arrangement for carrying out the method
US5144922A (en) * 1990-11-01 1992-09-08 Southwest Research Institute Fuel ignition system for compression ignition engines
DE19718750B4 (en) * 1996-05-10 2008-12-24 Volkswagen Ag Method and device for measuring the temperature of glow plugs of a self-igniting internal combustion engine
DE19810000A1 (en) * 1998-03-09 1999-09-16 Eberspaecher J Gmbh & Co Glow element with electrical heating wire to ignite fuel-air mixture

Also Published As

Publication number Publication date
EP1787022A1 (en) 2007-05-23
WO2006009523A1 (en) 2006-01-26

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