EP1500879B1 - Glow plug with integral pressure sensing - Google Patents
Glow plug with integral pressure sensing Download PDFInfo
- Publication number
- EP1500879B1 EP1500879B1 EP20040014414 EP04014414A EP1500879B1 EP 1500879 B1 EP1500879 B1 EP 1500879B1 EP 20040014414 EP20040014414 EP 20040014414 EP 04014414 A EP04014414 A EP 04014414A EP 1500879 B1 EP1500879 B1 EP 1500879B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- glow plug
- pressure
- combustion chamber
- housing
- glow
- 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.)
- Expired - Lifetime
Links
- 238000002485 combustion reaction Methods 0.000 claims description 34
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims 2
- 238000005259 measurement Methods 0.000 description 3
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
- F23Q7/001—Glowing plugs for internal-combustion engines
-
- 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
- F02P19/028—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 the glow plug being combined with or used as a sensor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
- F23Q7/001—Glowing plugs for internal-combustion engines
- F23Q2007/002—Glowing plugs for internal-combustion engines with sensing means
Definitions
- the invention relates to a glow plug for arrangement in a combustion chamber of an internal combustion engine, consisting essentially of a arranged in a glow tube heating and control coil and connected to the control coil connecting bolt, wherein the glow tube together with at least a portion of the connecting bolt surrounded by a housing and the glow plug comprises an integrated pressure measuring device.
- a glow plug is made of documents DE-A-4 132 842 and WO-A-97/09567 already known.
- the engines require a heat source for a good start and warm-up behavior at low temperatures, which preheats either the gas mixture, the intake air or the combustion chamber.
- a heat source for a good start and warm-up behavior at low temperatures, which preheats either the gas mixture, the intake air or the combustion chamber.
- cars usually glow plugs are used for this purpose. They protrude with their radiator into the combustion chamber of the internal combustion engine.
- glow plugs are present, which have in their housing wall a so-called pressure bore, which is coupled to a remote from the combustion chamber end pressure sensor.
- the pressure measurement itself is usually carried out via a pressure sensor, which usually exploits the pressure sensitivity of piezoceramics.
- the object of the invention is to optimize the measures provided for glow plugs measurement of prevailing in a combustion chamber of an internal combustion engine pressure and to propose a cost-effective solution.
- the object of the invention is to provide for the pressure measuring device a pressure channel which is formed by at least one longitudinal groove on the inner wall of the housing in the combustion chamber near the housing and extends to a pressure transducer, which is preferably arranged at the combustion chamber remote end of the glow plug.
- the essential idea of the invention is that it dispenses with a very costly oblong hole and by conventional means a pressure line from the region of the combustion chamber near the end of the housing is provided up to the remote from the combustion chamber pressure transducer.
- One of the significant advantages of the invention is that due to the construction according to the invention, which serves to produce a pressure channel, a very inexpensive and commercially available pressure sensor can be used.
- a particularly preferred embodiment provides that the pressure channel is guided by the combustion chamber near the glow plug in the housing and from there via a bore in the connecting bolt to the combustion chamber distant part of the glow plug on which then the corresponding pressure transducer can be installed via an adapter.
- a glow plug 1 according to the invention is shown. It consists of a radiator 2, which in turn consists of a glow tube 3, in which a filament 4 is embedded.
- the filament 4 consists of a heating coil 5 and a control coil 6, wherein the heating coil 5 is connected at its free end to the glow tube 4 and the control coil 6 with its other end to a connecting bolt 7.
- the glow tube 3 is assigned to the combustion chamber near area 8.
- the connecting bolt 7 extends into the combustion chamber remote area 9.
- a part of the glow tube 3, which is associated with the combustion chamber remote area 8, and a large part of the connecting bolt 7 are surrounded by a housing 10.
- This housing 10 serves to make the entire glow plug 1 compact.
- the housing 10 has on its outside a thread 11, by means of which the glow plug 1 is mounted in the internal combustion engine.
- the glow tube 3 is pressed into the housing 10.
- the housing 10 in the region of the press fit 12 between the glow tube 3 and the housing 10 grooves 13, which extend in the longitudinal extent of the glow plug 1.
- These grooves 13 cause the pressure generated in the combustion chamber of the internal combustion engine via these grooves 13 in the housing 10 of the glow plug 1 are performed.
- the pressure thus located in the housing 10 is further transmitted via transverse bores 14, which are provided in the housing 10 arranged connecting bolt 7. From there, the pressure generated in the combustion chamber is transmitted via a further longitudinal bore 15 (pressure channel D) to the pressure sensor 16 arranged in the combustion chamber remote region 9.
- the connecting bolt 7 is formed in two parts, wherein the part extending in the direction of the glow tube 3, is formed as solid material and the part which is provided with the holes (transverse bore 14 and longitudinal bore 15) as Pipe material is selected.
- a sensor can advantageously be provided which converts the pressure electromechanically, piezotechnically or optically into an electronically evaluable signal which is transmitted via a signal line 17 to a measuring device.
- a sealing element 18 is provided on the combustion chamber remote area 9 of the glow plug 1, which is designed such that this part passes through the connecting bolt 7, but also allows the supply of an electrical line 19, the is provided for the heating of the glow tube 3.
- An insulating disc 20 prevents an electrical contact in the direction of the pressure sensor 16 is formed.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measuring Fluid Pressure (AREA)
Description
Die Erfindung bezieht sich auf eine Glühstiftkerze zur Anordnung in einen Brennraum einer Brennkraftmaschine, bestehend im wesentlichen aus einer in einem Glührohr angeordnete Heiz- und Regelwendel und einem mit der Regelwendel verbundenen Anschlussbolzen, wobei das Glührohrs zusammen mit mindestens einem Teil des Anschlussbolzens von einem Gehäuse umgeben ist und die Glühstiftkerze eine integrierte Druckmesseinrichtung umfasst. Ein solche Glühstiftkerze ist aus Dokumenten
Die Motoren benötigen für ein gutes Start- und Warmlaufverhalten bei tiefen Temperaturen eine Wärmequelle, die entweder das Gasgemisch, die Ansaugluft oder den Brennraum vorwärmt. Insbesondere bei Kraftwagen (Pkw) werden hierfür meist Glühstiftkerzen verwendet. Sie ragen mit ihrem Heizkörper in den Brennraum der Brennkraftmaschine hinein.The engines require a heat source for a good start and warm-up behavior at low temperatures, which preheats either the gas mixture, the intake air or the combustion chamber. Especially for cars (cars) usually glow plugs are used for this purpose. They protrude with their radiator into the combustion chamber of the internal combustion engine.
Um eine bessere Aussage über die Verbrennung zu erhalten, sind Daten über die Verhältnisse im Brennraum notwendig. Hierzu zählen insbesondere Druck und Temperatur.To get a better idea about the combustion, data about the conditions in the combustion chamber are necessary. These include in particular pressure and temperature.
Für solche Messzwecke sind Glühstiftkerzen vorhanden, die in ihrer Gehäusewand eine sogenannte Druckbohrung aufweisen, die mit einem am brennraumfernen Ende angeordneten Druckaufnehmer gekoppelt ist. Die Druckmessung selbst erfolgt in der Regel über einen Drucksensor, der meist die Druckempfindlichkeit von Piezokeramik ausnutzt.For such measuring purposes glow plugs are present, which have in their housing wall a so-called pressure bore, which is coupled to a remote from the combustion chamber end pressure sensor. The pressure measurement itself is usually carried out via a pressure sensor, which usually exploits the pressure sensitivity of piezoceramics.
Bei dem im Stand der Technik vorgeschlagenen Druckmesseinrichtung ist diese vollständig unabhängig von der eigentlichen Glühfunktion der Glühstiftkerze. Um eine solche Druckbohrung überhaupt herzustellen, ist es notwendig, eine sehr lange und damit tiefe Lochbohrung mit einem sehr geringen Durchmesser herzustellen, der sich über die gesamte Länge der Glühstiftkerze erstreckt. Dies ist mit einem technisch sehr hohen Aufwand und damit hohen Kosten ausführbar.In the pressure measuring device proposed in the prior art, this is completely independent of the actual glow function of the glow plug. To produce such a pressure bore at all, it is necessary to produce a very long and thus deep hole bore with a very small diameter, which extends over the entire length of the glow plug. This can be done with a technically very high cost and therefore high costs.
Ferner erweist sich von Nachteil, dass die lange dünne Bohrung den an dem brennraumnahen Ende der Bohrung entstehenden Druckverlauf dämpft und somit möglicherweise verfälscht. Eine weiterer Nachteil kann darin bestehen, dass ein sogenanntes Pfeifenschwingen innerhalb der Bohrung entsteht, und daher auf diese Art und Weise das Signal verfälscht wird.Furthermore, it proves to be disadvantageous that the long, thin bore dampens the pressure profile which arises at the end of the bore near the combustion chamber and thus possibly falsifies it. Another disadvantage may be that a so-called pipe swing occurs within the bore, and therefore the signal is corrupted in this way.
Ferner tritt häufig der Fall ein, dass die Brennraum nahe Bohrung, explizit der Austritt der Bohrung aus der Glühstiftkerze verkokt und so eine Messung nicht mehr möglich macht.Furthermore, the case often occurs that the combustion chamber near hole, explicitly coked the exit of the bore from the glow plug and so makes a measurement no longer possible.
Die Aufgabe der Erfindung ist es, die für Glühstiftkerzen vorgesehene Messung des in einem Brennraum einer Brennkraftmaschine herrschenden Druck zu optimieren und eine kostengünstige Lösung vorzuschlagen.The object of the invention is to optimize the measures provided for glow plugs measurement of prevailing in a combustion chamber of an internal combustion engine pressure and to propose a cost-effective solution.
Die Lösung der Aufgabe besteht darin, für die Druckmesseinrichtung einen Druckkanal vorzusehen, der durch mindestens eine Längsrille auf der Innenwandung des Gehäuses im brennraumnahen Bereich des Gehäuses gebildet ist und sich bis zu einem Druckaufnehmer, der vorzugsweise am brennraumfernen Ende der Glühstiftkerze angeordnet ist, erstreckt.The object of the invention is to provide for the pressure measuring device a pressure channel which is formed by at least one longitudinal groove on the inner wall of the housing in the combustion chamber near the housing and extends to a pressure transducer, which is preferably arranged at the combustion chamber remote end of the glow plug.
Somit ist der wesentliche Gedanke der Erfindung der, dass auf eine sehr kostenintensive Langlochbohrung verzichtet wird und mit herkömmlichen Mitteln eine Druckleitung von dem Bereich des brennraumnahen Endes des Gehäuses bis zu dem am brennraumfernen Ende gelegenen Druckaufnehmers geschaffen wird.Thus, the essential idea of the invention is that it dispenses with a very costly oblong hole and by conventional means a pressure line from the region of the combustion chamber near the end of the housing is provided up to the remote from the combustion chamber pressure transducer.
Einer der wesentlichen Vorteile der Erfindung besteht darin, dass aufgrund der erfindungsgemäßen Bauweise, die zur Herstellung eines Druckkanals dient, ein sehr kostengünstiger und handelsüblicher Drucksensor verwendet werden kann.One of the significant advantages of the invention is that due to the construction according to the invention, which serves to produce a pressure channel, a very inexpensive and commercially available pressure sensor can be used.
Zudem besteht ein Vorteil darin, dass aufgrund der im Bereich des Dichtsitzes der Glühstiftkerze der Brennkraftmaschine angeordneten Riefen bzw. Rillen gleich mehrere Druckkanäle gebildet sind, so dass ein redundantes Messergebnis möglich ist, auch wenn ein Druckrohr, beispielsweise durch Verstopfung (beispielsweise durch Verkokung) ausfällt.In addition, there is an advantage that due to the arranged in the region of the sealing seat of the glow plug of the engine grooves or grooves several pressure channels are formed, so that a redundant measurement result is possible, even if a pressure tube, for example by clogging (for example, by coking) fails ,
Eine besonders bevorzugte Ausführungsform sieht vor, dass der Druckkanal von dem brennraumnahen Bereich der Glühstiftkerze in das Gehäuse und von dort über eine Bohrung in dem Anschlussbolzen zum brennraumfernen Teil der Glühstiftkerze geführt wird, an dem dann über einen Adapter der entsprechende Druckaufnehmer installierbar ist.A particularly preferred embodiment provides that the pressure channel is guided by the combustion chamber near the glow plug in the housing and from there via a bore in the connecting bolt to the combustion chamber distant part of the glow plug on which then the corresponding pressure transducer can be installed via an adapter.
Weitere vorteilhafte Ausgestaltungen gehen aus der nachfolgenden Beschreibung, den Zeichnungen sowie den Ansprüchen hervor.Further advantageous embodiments will become apparent from the following description, the drawings and the claims.
Es zeigen
- Fig. 1
- Eine Ansicht auf einen Querschnitt einer erfindungsgemäßen Glühstiftkerze mit integrierter Druckmesseinrichtung;
- Fig. 2
- Eine vergrößerte Ansicht des brennraumnahen Teils der Glühstiftkerze zur Verdeutlichung der Anordnung der erfindungsgemäßen Längsrillen.
- Fig. 1
- A view of a cross section of a glow plug according to the invention with integrated pressure measuring device;
- Fig. 2
- An enlarged view of the combustion chamber near part of the glow plug to illustrate the arrangement of the longitudinal grooves according to the invention.
In
Das Glührohr 3 ist dem brennraumnahen Bereich 8 zugeordnet. Der Anschlussbolzen 7 erstreckt sich in den brennraumfernen Bereich 9. Ein Teil des Glührohrs 3, das dem brennraumfernen Bereich 8 zugeordnet ist, und ein großer Teil des Anschlussbolzens 7 sind von einem Gehäuse 10 umgeben. Dieses Gehäuse 10 dient dazu, die gesamte Glühstiftkerze 1 kompakt auszuführen. Das Gehäuse 10 weist auf seiner Außenseite ein Gewinde 11 auf, mittels dem die Glühstiftkerze 1 in die Brennkraftmaschine montierbar ist.The
Zur Herstellung der Glühstiftkerze 1 wird das Glührohr 3 in das Gehäuse 10 eingepresst. Dabei weist das Gehäuse 10 im Bereich des Presssitzes 12 zwischen Glührohr 3 und Gehäuse 10 Rillen 13 auf, die sich in die Längserstreckung der Glühstiftkerze 1 ausdehnen.To produce the
Diese Rillen 13 bewirken, dass der in dem Brennraum der Brennkraftmaschine erzeugte Druck über diese Rillen 13 in das Gehäuse 10 der Glühstiftkerze 1 geführt werden. Der so im Gehäuse 10 befindliche Druck wird weiter über Querbohrungen 14, die in dem Gehäuse 10 angeordneten Anschlussbolzen 7 vorgesehen sind, übertragen. Von dort wird der im Brennraum erzeugte Druck über eine weitere Längsbohrung 15 (Druckkanal D) an den im brennraumfernen Bereich 9 angeordneten Drucksensor 16 übermittelt.These
Alternativ hierzu kann auch vorgesehen werden, dass der Anschlussbolzen 7 zweiteilig ausgebildet ist, wobei der Teil der in der Richtung Glührohr 3 sich erstreckt, als Vollmaterial ausgebildet ist und der Teil, der mit den Bohrungen (Querbohrung 14 und Längsbohrung 15) vorgesehen ist, als Rohrmaterial ausgewählt wird.Alternatively, it can also be provided that the connecting
Als Druckaufnehmer bzw. Drucksensor 16 kann vorteilhafter Weise ein Sensor vorgesehen werden, der den Druck elektromechanisch, piezotechnisch oder optisch in ein elektronisch auswertbares Signal umwandelt, das über eine Signalleitung 17 an eine Messeinrichtung übertragen wird.As a pressure sensor or
Um die Abdichtung des Innenraums des Gehäuses 10 zu gewährleisten, ist an dem brennraumfernen Bereich 9 der Glühstiftkerze 1 ein Dichtelement 18 vorgesehen, das derart ausgestaltet ist, dass dieses zum Teil den Anschlussbolzen 7 hindurchführt, aber auch die Zuführung einer elektrischen Leitung 19 ermöglicht, die für die Heizung des Glührohrs 3 vorgesehen ist.In order to ensure the sealing of the interior of the
Eine Isolierscheibe 20 verhindert, dass ein elektrischer Kontakt in Richtung des Drucksensors 16 entsteht.An
Claims (6)
- Glow plug for a combustion chamber of an internal combustion engine, composed substantially of heating and regulating coils (4), which are arranged in a glow tube (3), and a connecting bolt (7) which is connected to the regulating coil (6), wherein that part of the glow tube (3) which is remote from the combustion chamber, together with at least one part of the connecting bolt (7), is surrounded by a housing (10) and comprises an integral pressure sensing device (16), characterized in that the pressure sensing device (16) comprises a pressure duct (D) which is formed at least by a channel (13) on the inner wall of the housing (10) in that region (8) of the housing (10) which is close to the combustion chamber, and which pressure duct (D) extends as far as a pressure sensor within the housing (10) of the glow plug (1).
- Glow plug according to Claim 1, characterized in that the outer diameter of the connecting bolt (7) is smaller than the diameter of the housing (10), and a pressure duct is thereby formed.
- Glow plug according to Claim 1, characterized in that at least that part (9) of the connecting bolt (7) which is remote from the combustion chamber is designed as a tube, and a pressure duct is thereby formed.
- Glow plug according to Claim 1, characterized in that the connecting bolt (7) has at least one transverse bore (14) through which the pressure is transmitted to the pressure sensor (16).
- Glow plug according to at least one of the preceding claims, characterized in that an adapter element can be attached to that end (9) of the glow plug (1) which is remote from the combustion chamber, which adapter element is provided for holding the pressure sensor (16).
- Glow plug according to at least one of the preceding claims, characterized in that a sealing element (18) is provided for sealing off the interior space of the glow plug with respect to the environment.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2003132960 DE10332960A1 (en) | 2003-07-21 | 2003-07-21 | Glow plug with integrated pressure measurement |
| DE10332960 | 2003-07-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1500879A1 EP1500879A1 (en) | 2005-01-26 |
| EP1500879B1 true EP1500879B1 (en) | 2009-02-25 |
Family
ID=33482986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20040014414 Expired - Lifetime EP1500879B1 (en) | 2003-07-21 | 2004-06-19 | Glow plug with integral pressure sensing |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1500879B1 (en) |
| DE (2) | DE10332960A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015205671A1 (en) | 2015-03-30 | 2016-10-06 | Robert Bosch Gmbh | Brennraumdruckaufnehmer, internal combustion engine and method for measuring a combustion chamber pressure in a combustion chamber of an internal combustion engine |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004025968A1 (en) * | 2004-05-27 | 2005-12-15 | Robert Bosch Gmbh | Coking protection for a glow plug with a glass channel for pressure measurement |
| DE102006037235A1 (en) * | 2006-08-09 | 2008-02-14 | Siemens Ag | Method and device for determining a pressure in the combustion chamber of an internal combustion engine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59134341A (en) * | 1983-01-21 | 1984-08-02 | Nippon Soken Inc | Fuel injection timing control device in diesel-engine |
| DE4132842A1 (en) * | 1991-10-02 | 1993-04-08 | Beru Werk Ruprecht Gmbh Co A | Glow plug with sensor element enabling physical parameter measurement - has off-centre heating rod pressed into bore in plug body parallel to sensor element bore |
| JP3177819B2 (en) * | 1995-09-05 | 2001-06-18 | 株式会社ユニシアジェックス | In-cylinder pressure detector for internal combustion engines |
-
2003
- 2003-07-21 DE DE2003132960 patent/DE10332960A1/en not_active Withdrawn
-
2004
- 2004-06-19 EP EP20040014414 patent/EP1500879B1/en not_active Expired - Lifetime
- 2004-06-19 DE DE200450009036 patent/DE502004009036D1/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015205671A1 (en) | 2015-03-30 | 2016-10-06 | Robert Bosch Gmbh | Brennraumdruckaufnehmer, internal combustion engine and method for measuring a combustion chamber pressure in a combustion chamber of an internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10332960A1 (en) | 2005-02-10 |
| DE502004009036D1 (en) | 2009-04-09 |
| EP1500879A1 (en) | 2005-01-26 |
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