EP0473735A1 - Pressure sensor for the determination of the pressure in the combustion chamber of an internal-combustion engine - Google Patents

Pressure sensor for the determination of the pressure in the combustion chamber of an internal-combustion engine

Info

Publication number
EP0473735A1
EP0473735A1 EP91904035A EP91904035A EP0473735A1 EP 0473735 A1 EP0473735 A1 EP 0473735A1 EP 91904035 A EP91904035 A EP 91904035A EP 91904035 A EP91904035 A EP 91904035A EP 0473735 A1 EP0473735 A1 EP 0473735A1
Authority
EP
European Patent Office
Prior art keywords
pressure sensor
net
pressure
housing
electronic components
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Withdrawn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
EP91904035A
Other languages
German (de)
French (fr)
Inventor
Walter Benedikt
Manfred Vogel
Werner Herden
Johann Konrad
Wolfgang Schmidt
Josef Tosch
Matthias KÜSELL
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0473735A1 publication Critical patent/EP0473735A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
    • G01L9/008—Transmitting or indicating the displacement of flexible diaphragms using piezoelectric devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/08—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically
    • G01L23/10—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically by pressure-sensitive members of the piezoelectric type

Definitions

  • Pressure sender for pressure detection in the combustion chamber of internal combustion engines
  • the invention is based on a pressure sensor according to the type of claim 1.
  • a pressure sensor known from US Pat. No. 4,620,438, the electronic components are arranged on a ceramic plate, which in the longitudinal direction of the pressure sensor after the counter bearing in the housing is attached.
  • the piezo elements are on the other side of the counter bearing. As a result, the piezo elements and the electronic components have to be connected to one another in a complex manner with the aid of insulated wire pieces.
  • the size of the pressure sensor is further extended.
  • the pressure sensor according to the invention with the characterizing features of claim 1 has the advantage that the electronic components, the one or more piezo elements and the plunger located between the piezo elements and the membrane are on a single ceramic plate, a hybrid.
  • simple standard bonding techniques that have been tried and tested in practice can be used to connect the electronic components and the piezo elements become.
  • the entire hybrid, including the electronic components and the piezo elements, can be checked before installation in the sensor housing. This enables simple mounting of the pressure sensor. In particular, its overall length is shortened.
  • the pressure sensor is thus inexpensive to manufacture. Because of the spatial arrangement, in particular due to the arrangement on the same hybrid in the immediate vicinity of one another, the electronic components and the piezo elements have almost the same temperature.
  • 10 denotes the housing of a pressure sensor 11 for determining the pressure in the combustion chamber of an internal combustion engine. It has a central, continuous, stepped bore 12.
  • the opening 13 of the housing 10 facing the combustion chamber becomes completed by a membrane 14.
  • the membrane 14 is designed as a so-called cap membrane, the edge of the membrane 14 being bent and being pushed over the end of the shaft 15 of the housing 10.
  • the membrane 14 is firmly seated on the housing 10, but in order to ensure that the membrane 14 can move, it does not lie directly against the end face 16 of the shaft 15.
  • the bending area of the membrane 14 can thereby move freely.
  • the membrane 14 is welded to the shaft 15 in the region of the edge.
  • the membrane 14 is particularly advantageously formed from a superalloy, that is to say from an alloy of, for example, approximately 50% Ni, 20% Cr, 20% Fe.
  • a plunger 18 bears with one end, which bears against a sensor block 19 with its other end.
  • the stamp 18 can consist of glass ceramic and there can also be a heat-conducting film between the sensor block 19 and the stamp 18.
  • the sensor block 19 consists of at least one piezoceramic element 21, for example a quartz disk, which is arranged between two electrical contact disks 22, 23, for example made of the material Invar.
  • the contact surfaces between the contact disks 22, 23 and the piezoceramic element 21 and the stamp 18 are glued, it being possible, for example, to use a high-temperature-resistant conductive adhesive.
  • the contact disk 23 is glued to a ceramic disk, for example an Al 0 hybrid.
  • the plate 24 is glued to a counter bearing 25 pressed into the bore 12.
  • the counter bearing 25 has a through bore 26 which runs approximately axially parallel to the bore 12 and in which the discharge line 27 is guided by the two contact disks.
  • the line 27 is fastened in a grommet 29 of the cover 30 which closes off the bore 12.
  • the measured values are conducted via line 27 to an evaluation circuit and control device of the internal combustion engine, not shown.
  • a segment can also be cut out on the counter bearing 25 for the passage of the line 27.
  • the electronic components 33 such as resistors, transistors, etc., are located on the same side of the plate 24.
  • the electronic components 33 and the contact disks 22 and 23 are made with the aid of bonding wires 34 and thick Layer conductor tracks 35 connected.
  • the bore 12 in the area of the sensor block 19 and the electronic components 33 and in the area between the counter bearing 25 and the cover 30 is cast with a casting compound 36.
  • the function of a pressure sensor is generally known and is therefore not explained in detail here.
  • the force acting on the sensor block 19 via the membrane 14 and the plunger 18 produces a surface charge of the piezoceramic element or the quartz element 21 caused by a change in polarization.
  • the surface charge is picked up as a measurement signal via the contact disks 22, 23. Since the electronic components 33 are located on the same side of the plate 24 directly in the vicinity of the sensor block 19, an evaluation of the measurement signal is possible in the immediate vicinity of the acquisition of the measurement signal. Only simple bond connections between the contact disk 23 and the components 33 or between the components 33 with one another are necessary. Due to a relatively long stamp 18, the electronic components 33 are relatively far and thus protected from the effects of temperature from the combustion chamber.
  • the inventive arrangement of the components 33 and the sensor block 19 on the plate 24 makes it particularly easy to mount the pressure sensor 11.
  • the stamp 16, the sensor block 19, the components 33, the plate 24 and the counter bearing 25 with the leads 27 can already be preassembled as one unit.
  • Already outside the housing 10 of the Pressure sensor 11 can thus check the functionality of components 33 and sensor block 19.
  • the preassembled, already checked unit needs to be pushed into the housing 10 from an opening in the bore 12 until it bears against the membrane 14. Since the counter bearing 25 is pressed into the housing 10, the unit in the housing 10 is slightly centered and fixed.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

Détecteur de pression (11) qui comprend un dispositif de détection (19) composé d'au moins un matériau piézoélectrique (21) et d'au moins un disque de contact (22, 23), et des composants électroniques (33) d'un circuit d'évaluation électrique, situés sur la face d'une plaque de céramique (24) regardant la membrane (14). L'autre face de ladite plaque (24) adhère à une butée (25). Les composants électroniques (33) et les disques de contact (22, 23) sont reliés entre eux à l'aide de simples fils de liaison standard (34). Ledit détecteur de pression (11) est donc relativement compact et peut être fabriqué pour un coût modique. En outre, le dispositif de détection (19) et le circuit d'évaluation électrique peuvent déjà être vérifiés lors du préassemblage.Pressure detector (11) which comprises a detection device (19) composed of at least one piezoelectric material (21) and at least one contact disc (22, 23), and electronic components (33) of an electrical evaluation circuit, located on the face of a ceramic plate (24) looking at the membrane (14). The other face of said plate (24) adheres to a stopper (25). The electronic components (33) and the contact discs (22, 23) are linked together using simple standard connecting wires (34). Said pressure detector (11) is therefore relatively compact and can be manufactured at low cost. In addition, the detection device (19) and the electrical evaluation circuit can already be checked during the pre-assembly.

Description

Druckσeber zur Druckerfassuncr im Brennraum von BrennkraftmaschinenPressure sender for pressure detection in the combustion chamber of internal combustion engines
Stand der TechnikState of the art
Die Erfindung geht aus von einem Druckgeber nach der Gattung des An¬ spruchs 1. Bei einem derartigen, aus der US-PS 4 620 438 bekannten Druckgeber sind die elektronischen Bauteile auf einer keramischen Platte angeordnet, die in Längsrichtung des Drucksensors nach dem Gegenlager im Gehäuse befestigt ist. Die Piezoelemente befinden sich auf der anderen Seite des Gegenlagers. Dadurch müssen die Piezoele¬ mente und die elektronischen Bauteile mit Hilfe von isolierten Drahtstücken aufwendig miteinander verbunden werden. Die Baugröße des Drucksensors wird dadurch ferner verlängert.The invention is based on a pressure sensor according to the type of claim 1. In such a pressure sensor, known from US Pat. No. 4,620,438, the electronic components are arranged on a ceramic plate, which in the longitudinal direction of the pressure sensor after the counter bearing in the housing is attached. The piezo elements are on the other side of the counter bearing. As a result, the piezo elements and the electronic components have to be connected to one another in a complex manner with the aid of insulated wire pieces. The size of the pressure sensor is further extended.
Vorteile der ErfindungAdvantages of the invention
Der erfindungsgemäße Drucksensor mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß sich die elektro¬ nischen Bauteile, das oder die Piezoelemente und der sich zwischen den Piezoelementen und der Membran befindliche Stempel auf einer einzigen keramischen Platte, einem Hybrid befindet. Dadurch können einfache, in der Praxis erprobte Standardbondtechniken zur Verbin¬ dung der elektronischen Bauteile und der Piezoelemente angewendet werden. Der gesamte Hybrid, einschließlich der elektronischen Bau¬ teile und der Piezoelemente, kann bereits vor dem Einbau in das Sen¬ sorgehäuse überprüft werden. Dadurch ist eine einfache Montage des Drucksensors möglich. Insbesondere seine Baulänge wird verkürzt. Der Drucksensor ist somit kostengünstig herstellbar. Aufgrund der räum¬ lichen Anordnung, insbesondere durch die Anordnung auf demselben Hy¬ brid in unmittelbarer Nachbarschaft zueinander, herrscht bei den elektronischen Bauteilen und den Piezoelementen nahezu die gleiche Temperatur. Aufwendige Maßnahmen zur Temperaturkompensation können dadurch entfallen. Vielmehr ist es möglich, mit Hilfe von elektroni¬ schen Bauteilen eine Kompensation des systematischen Temperaturgangs der als Piezoelemente verwendeten Piezokeramiken zu ermöglichen. Außerdem ist kein elektrischer Anschluß des Piezoelements mit dem Gehäuse leitend verbunden, wodurch ein potentialfreier Aufbau des Sensors möglich ist und somit das Meßsignal nahezu fehlerfrei übertragen wird.The pressure sensor according to the invention with the characterizing features of claim 1 has the advantage that the electronic components, the one or more piezo elements and the plunger located between the piezo elements and the membrane are on a single ceramic plate, a hybrid. As a result, simple standard bonding techniques that have been tried and tested in practice can be used to connect the electronic components and the piezo elements become. The entire hybrid, including the electronic components and the piezo elements, can be checked before installation in the sensor housing. This enables simple mounting of the pressure sensor. In particular, its overall length is shortened. The pressure sensor is thus inexpensive to manufacture. Because of the spatial arrangement, in particular due to the arrangement on the same hybrid in the immediate vicinity of one another, the electronic components and the piezo elements have almost the same temperature. This eliminates the need for costly measures for temperature compensation. Rather, it is possible to use electronic components to compensate for the systematic temperature response of the piezo ceramics used as piezo elements. In addition, no electrical connection of the piezo element is conductively connected to the housing, which enables a potential-free construction of the sensor and thus the measurement signal is transmitted almost without errors.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vor¬ teilhafte Weiterbildungen des im Anspruch 1 angegebenen Drucksensors möglich.The measures listed in the subclaims allow advantageous developments of the pressure sensor specified in claim 1.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung darge¬ stellt und in der nachfolgenden Beschreibung näher erläutert. Die einzige Figur zeigt einen Schnitt durch einen Druckgeber.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. The only figure shows a section through a pressure sensor.
Beschreibung des AusführungsbeispielsDescription of the embodiment
In der einzigen Figur ist mit 10 das Gehäuse eines Drucksensors 11 zur Bestimmung des Drucks im Brennraum einer Brennkraftmaschine be¬ zeichnet. Es weist eine mittige, durchgehende, abgesetzte Bohrung 12 auf. Die dem Brennraum zugewandte Öffnung 13 des Gehäuses 10 wird von einer Membran 14 abgeschlossen. Die Membran 14 ist als sogenann¬ te Kappenmembran ausgebildet, wobei der Rand der Membran 14 umgebo¬ gen ist und über das Ende des Schafts 15 des Gehäuses 10 geschoben ist. Die Membran 14 sitzt dadurch fest am Gehäuse 10, liegt aber, um eine Beweglichkeit der Membran 14 zu gewährleisten, nicht direkt an der Stirnseite 16 des Schafts 15 an. Der Biegebereich der Membran 14 kann sich dadurch frei bewegen. Die Membran 14 ist im Bereich des Randes am Schaft 15 angeschweißt. Besonders vorteilhaft ist die Mem¬ bran 14 aus einer Superlegierung, das heißt aus einer Legierung von zum Beispiel ca. 50% Ni, 20% Cr, 20% Fe ausgebildet. Am mittleren Bereich der Membran 14 liegt ein Stempel 18 mit seinem einen Ende an, der mit seinem anderen Ende an einem Sensorblock 19 anliegt. Der Stempel 18 kann aus Glaskeramik bestehen und ferner kann sich zwi¬ schen dem Sensorblock 19 und dem Stempel 18 eine Wärmeleitfolie be¬ finden. Der Sensorblock 19 besteht aus mindestens einem piezokerami- schen Element 21, zum Beispiel einer Quarzscheibe, das zwischen zwei elektrischen Kontaktscheiben 22, 23, zum Beispiel aus dem Material Invar, angeordnet ist. Die Kontaktflächen zwischen den Kontaktschei¬ ben 22, 23 und dem piezokeramischen Element 21 und dem Stempel 18 sind geklebt, wobei zum Beispiel ein hochtemperaturfester Leitkleber verwendet werden kann. Ferner ist die Kontaktscheibe 23 auf einer keramischen Scheibe, zum Beispiel einem AI 0 -Hybrid, aufge¬ klebt. Die Platte 24 ist an einem in die Bohrung 12 eingepreßten Ge¬ genlager 25 angeklebt. Das Gegenlager 25 weist eine etwa achsparal¬ lel zur Bohrung 12 verlaufende, durchgehende Bohrung 26 auf, in der die Ableitleitung 27 von den beiden Kontaktscheiben geführt wird. Die Leitung 27 ist in einer Tülle 29 des die Bohrung 12 abschließen¬ den Deckels 30 befestigt. Über die Leitung 27 werden die Meßwerte zu einer nicht dargestellten Auswerteschaltung und Steuereinrichtung der Brennkraftmaschine geführt. Statt einer Bohrung 12 kann auch am Gegenlager 25 ein Segment zur Durchführung der Leitung 27 ausge¬ schnitten sein. Neben dem Sensorblock 19 befinden sich auf derselben Seite der Plat¬ te 24 die elektronischen Bauteile 33, wie zum Beispiel Widerstände, Transistoren, etc. Die elektronischen Bauteile 33 und die Kontakt¬ scheibe 22 bzw. 23 sind mit Hilfe von Bonddrähten 34 und Dick¬ schichtleiterbahnen 35 verbunden.In the single figure, 10 denotes the housing of a pressure sensor 11 for determining the pressure in the combustion chamber of an internal combustion engine. It has a central, continuous, stepped bore 12. The opening 13 of the housing 10 facing the combustion chamber becomes completed by a membrane 14. The membrane 14 is designed as a so-called cap membrane, the edge of the membrane 14 being bent and being pushed over the end of the shaft 15 of the housing 10. As a result, the membrane 14 is firmly seated on the housing 10, but in order to ensure that the membrane 14 can move, it does not lie directly against the end face 16 of the shaft 15. The bending area of the membrane 14 can thereby move freely. The membrane 14 is welded to the shaft 15 in the region of the edge. The membrane 14 is particularly advantageously formed from a superalloy, that is to say from an alloy of, for example, approximately 50% Ni, 20% Cr, 20% Fe. At the central area of the membrane 14, a plunger 18 bears with one end, which bears against a sensor block 19 with its other end. The stamp 18 can consist of glass ceramic and there can also be a heat-conducting film between the sensor block 19 and the stamp 18. The sensor block 19 consists of at least one piezoceramic element 21, for example a quartz disk, which is arranged between two electrical contact disks 22, 23, for example made of the material Invar. The contact surfaces between the contact disks 22, 23 and the piezoceramic element 21 and the stamp 18 are glued, it being possible, for example, to use a high-temperature-resistant conductive adhesive. Furthermore, the contact disk 23 is glued to a ceramic disk, for example an Al 0 hybrid. The plate 24 is glued to a counter bearing 25 pressed into the bore 12. The counter bearing 25 has a through bore 26 which runs approximately axially parallel to the bore 12 and in which the discharge line 27 is guided by the two contact disks. The line 27 is fastened in a grommet 29 of the cover 30 which closes off the bore 12. The measured values are conducted via line 27 to an evaluation circuit and control device of the internal combustion engine, not shown. Instead of a bore 12, a segment can also be cut out on the counter bearing 25 for the passage of the line 27. In addition to the sensor block 19, the electronic components 33, such as resistors, transistors, etc., are located on the same side of the plate 24. The electronic components 33 and the contact disks 22 and 23 are made with the aid of bonding wires 34 and thick Layer conductor tracks 35 connected.
Zum Schutz vor schädlichen Umwelteinflüssen, wie zum Beispiel Feuch¬ tigkeit, ist die Bohrung 12 im Bereich des Sensorblocks 19 und der elektronischen Bauteile 33 und im Bereich zwischen dem Gegenlager 25 und dem Deckel 30 mit einer Vergußmasse 36 ausgegossen.To protect against harmful environmental influences, such as moisture, the bore 12 in the area of the sensor block 19 and the electronic components 33 and in the area between the counter bearing 25 and the cover 30 is cast with a casting compound 36.
Die Funktion eines Druckgebers ist allgemein bekannt und hier des¬ halb nicht näher ausführlich erläutert. Die über die Membran 14 und dem Stempel 18 auf dem Sensorblock 19 einwirkende Kraft erzeugt eine durch Polarisationsanderung hervorgerufene Oberflächenladung des piezokera ischen Elements oder des Quarzelements 21. Die Oberflä¬ chenladung wird als Meßsignal über die Kontaktscheiben 22, 23 abge¬ griffen. Da sich die elektronischen Bauteile 33 auf derselben Seite der Platte 24 direkt in der Umgebung des Sensorblocks 19 befinden, ist eine Meßsignalauswertung in unmittelbarer Nachbarschaft der Ge¬ winnung des Meßsignals möglich. Es sind nur einfache Bondverbindun¬ gen zwischen der Kontaktscheibe 23 und den Bauteilen 33 bzw. zwi¬ schen den Bauteilen 33 untereinander notwendig. Aufgrund eines rela¬ tiv langen Stempels 18 sind die elektronischen Bauteile 33 relativ weit und somit geschützt vor Temperatureinflüssen vom Brennraum ent¬ fernt.The function of a pressure sensor is generally known and is therefore not explained in detail here. The force acting on the sensor block 19 via the membrane 14 and the plunger 18 produces a surface charge of the piezoceramic element or the quartz element 21 caused by a change in polarization. The surface charge is picked up as a measurement signal via the contact disks 22, 23. Since the electronic components 33 are located on the same side of the plate 24 directly in the vicinity of the sensor block 19, an evaluation of the measurement signal is possible in the immediate vicinity of the acquisition of the measurement signal. Only simple bond connections between the contact disk 23 and the components 33 or between the components 33 with one another are necessary. Due to a relatively long stamp 18, the electronic components 33 are relatively far and thus protected from the effects of temperature from the combustion chamber.
Ferner ist durch die erfindungsgemäße Anordnung der Bauteile 33 und des Sensorblocks 19 auf der Platte 24 eine besonders einfache Monta¬ ge des Drucksensors 11 möglich. Außerhalb des Gehäuses 10 kann be¬ reits der Stempel 16, der Sensorblock 19, die Bauteile 33, die Plat¬ te 24 und das Gegenlager 25 mit den Ableitungen 27 als eine Bauein¬ heit vormontiert werden. Bereits außerhalb des Gehäuses 10 des Drucksensors 11 können somit die Bauteile 33 und der Sensorblock 19 auf seine Funktionsfähigkeit hin überprüft werden. Bei der Endmonta¬ ge braucht somit nur noch die vormontierte, bereits überprüfte Ein¬ heit von einer Öffnung der Bohrung 12 her in das Gehäuse 10 einge¬ schoben werden, bis sie an der Membran 14 anliegt. Da das Gegenla¬ ger 25 in das Gehäuse 10 eingepreßt ist, ist die Einheit im Gehäu¬ se 10 leicht zentriert und fixiert. Furthermore, the inventive arrangement of the components 33 and the sensor block 19 on the plate 24 makes it particularly easy to mount the pressure sensor 11. Outside the housing 10, the stamp 16, the sensor block 19, the components 33, the plate 24 and the counter bearing 25 with the leads 27 can already be preassembled as one unit. Already outside the housing 10 of the Pressure sensor 11 can thus check the functionality of components 33 and sensor block 19. During the final assembly, only the preassembled, already checked unit needs to be pushed into the housing 10 from an opening in the bore 12 until it bears against the membrane 14. Since the counter bearing 25 is pressed into the housing 10, the unit in the housing 10 is slightly centered and fixed.

Claims

Ansprüche Expectations
1. Druckgeber (11) zur Druckerfassung im Brennraum von Brennkraftma¬ schinen, insbesondere von Kraftfahrzeugen, in dessen Gehäuse (10) ein Sensorblock (19), bestehend aus mindestens einem piezoelektrisch wirkenden Werkstoff (21) und mindestens einer elektrisch leitenden Kontaktscheibe (22, 23), mindestens ein Stempel (18), ein Gegenla¬ ger (25), eine das Gehäuse (10) abschließende und am Stempel (18) anliegende Membran (14) und eine elektrische Auswerteschaltung ange¬ ordnet sind, dadurch gekennzeichnet, daß der Sensorblock (19) und die elektronischen Bauteile (33) der Auswerteschaltung auf einer ke¬ ramischen Platte (24) angeordnet sind, die wenigstens teilweise am Gegenlager (25) anliegt, und daß die Bauteile (33) sich auf der der Membran (14) zugewandten Seite der Platte (24) befinden.1. Pressure sensor (11) for pressure detection in the combustion chamber of internal combustion engines, in particular motor vehicles, in the housing (10) of which a sensor block (19) consisting of at least one piezoelectrically active material (21) and at least one electrically conductive contact disk (22, 23), at least one plunger (18), a counter bearing (25), a membrane (14) which closes the housing (10) and bears against the plunger (18) and an electrical evaluation circuit, characterized in that the Sensor block (19) and the electronic components (33) of the evaluation circuit are arranged on a ceramic plate (24) which is at least partially in contact with the counter bearing (25), and that the components (33) rest on the membrane (14). facing side of the plate (24).
2. Druckgeber nach Anspruch 1, dadurch gekennzeichnet, daß die elek¬ tronischen Bauteile (33) und die Kontaktscheiben (22, 23) des Sen¬ sorblocks (19) mit Hilfe von Bonddrähten (34) und Dickschichtleiter¬ bahnen (35) verbunden sind.2. Pressure sensor according to claim 1, characterized in that the electronic components (33) and the contact disks (22, 23) of the sensor block (19) are connected by means of bonding wires (34) and thick-film conductor tracks (35) .
3. Druckgeber nach Anspruch 1 und/oder 2, dadurch gekennzeichnet, daß die Verbindungsflächen zwischen der Platte (24), dem piezoelek¬ trischen Werksotff (21) und den Kontaktscheiben (22, 23) geklebt sind. 3. Pressure sensor according to claim 1 and / or 2, characterized in that the connecting surfaces between the plate (24), the piezoelectric material (21) and the contact disks (22, 23) are glued.
4. Druckgeber nach einem der Ansprüche 1 bis 3, dadurch gekennzeich¬ net, daß die Platte (24) aus AI 0 besteht.4. Pressure sensor according to one of claims 1 to 3, characterized gekennzeich¬ net that the plate (24) consists of AI 0.
5. Druckgeber nach einem der Ansprüche 1 bis 4, dadurch gekennzeich¬ net, daß das Gegenlager (25) in das Gehäuse (10) eingepreßt ist.5. Pressure sensor according to one of claims 1 to 4, characterized gekennzeich¬ net that the counter-bearing (25) in the housing (10) is pressed.
6. Druckgeber nach einem der Ansprüche 1 bis 5, dadurch gekennzeich¬ net, daß im Gegenlager (25) eine Bohrung (26) zur Durchführung einer elektrischen Leitung (27) der Auswerteschaltung ausgebildet ist.6. Pressure transmitter according to one of claims 1 to 5, characterized gekennzeich¬ net that a bore (26) is formed in the counter bearing (25) for carrying out an electrical line (27) of the evaluation circuit.
7. Druckgeber nach einem der Ansprüche 1 bis 5, dadurch gekennzeich¬ net, daß am Gegenlager (25) ein abgeflachtes Segment (26) zur Durch¬ führung elektrischer Leitungen (27) ausgebildet ist.7. Pressure transmitter according to one of claims 1 to 5, characterized gekennzeich¬ net that a flattened segment (26) for the implementation of electrical lines (27) is formed on the counter bearing (25).
8. Druckgeber nach einem der Ansprüche 1 bis 6, dadurch gekennzeich¬ net, daß der Stempel (18) aus Glaskeramik besteht.8. Pressure sensor according to one of claims 1 to 6, characterized gekennzeich¬ net that the stamp (18) consists of glass ceramic.
9. Druckgeber nach einem der Ansprüche 1 bis 7, dadurch gekennzeich¬ net, daß das Gehäuse (10) im Bereich des Sensorblocks (19) und der elektronischen Bauteile (33) mit einer Vergußmasse vergossen ist. 9. Pressure sensor according to one of claims 1 to 7, characterized gekennzeich¬ net that the housing (10) in the region of the sensor block (19) and the electronic components (33) is cast with a casting compound.
EP91904035A 1990-03-23 1991-02-27 Pressure sensor for the determination of the pressure in the combustion chamber of an internal-combustion engine Withdrawn EP0473735A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4009377 1990-03-23
DE4009377A DE4009377A1 (en) 1990-03-23 1990-03-23 PRESSURE SENSOR FOR DETECTING PRINTERS IN THE COMBUSTION CHAMBER OF COMBUSTION ENGINES

Publications (1)

Publication Number Publication Date
EP0473735A1 true EP0473735A1 (en) 1992-03-11

Family

ID=6402911

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91904035A Withdrawn EP0473735A1 (en) 1990-03-23 1991-02-27 Pressure sensor for the determination of the pressure in the combustion chamber of an internal-combustion engine

Country Status (5)

Country Link
US (1) US5353633A (en)
EP (1) EP0473735A1 (en)
JP (1) JPH04505809A (en)
DE (1) DE4009377A1 (en)
WO (1) WO1991014929A1 (en)

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US5353633A (en) 1994-10-11
WO1991014929A1 (en) 1991-10-03
DE4009377A1 (en) 1991-10-02
JPH04505809A (en) 1992-10-08

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