WO1992001913A1 - Capteur de pression pour la mesure de la pression dans la chambre de combustion d'un moteur a combustion interne - Google Patents

Capteur de pression pour la mesure de la pression dans la chambre de combustion d'un moteur a combustion interne Download PDF

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Publication number
WO1992001913A1
WO1992001913A1 PCT/DE1991/000524 DE9100524W WO9201913A1 WO 1992001913 A1 WO1992001913 A1 WO 1992001913A1 DE 9100524 W DE9100524 W DE 9100524W WO 9201913 A1 WO9201913 A1 WO 9201913A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure sensor
sensor according
electronic components
counter bearing
pressure
Prior art date
Application number
PCT/DE1991/000524
Other languages
German (de)
English (en)
Inventor
Günther STECHER
Werner Herden
Wolfgang Schmidt
Manfred Moser
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
Priority to KR1019920700304A priority Critical patent/KR920702490A/ko
Publication of WO1992001913A1 publication Critical patent/WO1992001913A1/fr

Links

Classifications

    • 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
    • G01L23/18—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 resistance strain gauges
    • 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
    • G01L9/02—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 by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
    • G01L9/06—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 by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of piezo-resistive devices
    • 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
    • G01L9/0051—Transmitting or indicating the displacement of flexible diaphragms using variations in ohmic resistance
    • G01L9/0052—Transmitting or indicating the displacement of flexible diaphragms using variations in ohmic resistance of piezoresistive elements

Definitions

  • Pressure sensor for pressure detection in the combustion chamber of internal combustion engines
  • the invention is based on a pressure sensor according to the preamble of claim 1.
  • a pressure transmitter known from US Pat. No. 4,620,438, the electronic components are arranged on a ceramic plate which is fastened in the longitudinal direction of the pressure sensor after the counter bearing in the housing.
  • 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 sensor is particularly space-saving.
  • the circuit can be minimized by means of plated-through holes through the carrier. Through the cutouts there is enough space in the counterbearing for the arrangement of the electronic components and, in the assembled state, a slight adjustment, in particular by laser trimming, can also be carried out. This prevents the signals from being falsified when the electronic components are adjusted in the preassembled state, due to the assembly drift caused by the assembly.
  • the cables can be routed to the connections of the electronic components in a particularly simple manner.
  • FIG. 1 shows a longitudinal section through a pressure sensor
  • FIG. 2 shows a section in the direction II-II according to FIG. 1
  • FIGS. 3 and 4 each "a modification of a detail. Description of the embodiment
  • 1, 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 is closed off by a membrane 14.
  • the membrane 14 is designed as a so-called cap membrane, the edge of the membrane 14 being bent over 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 the mobility of the membrane 14, it does not lie directly against the inside 16 of the shaft 15.
  • the bending area of the membrane 14 can thus move freely.
  • the membrane 14 is welded to the shaft 15 in the region of the edge.
  • the membrane 14 made of a superalloy, that is an alloy of e.g. B.
  • a plunger 18 bears with one end, which bears against a transducer 19 with its other end.
  • the stamp 18 can consist of glass ceramic in order to ensure good heat insulation between the combustion chamber and the receiver 19.
  • z. B. a piezoresistive element can be used.
  • thick-film resistors 22 are printed on the carrier 21 of the hybrid.
  • cermet or plastic resistors can be used.
  • Al 0 O is particularly suitable as a substrate for the carrier 21.
  • z. B. also a piezoceramic element, e.g. B.
  • a quartz disk which is arranged between two electrical contact disks can be used.
  • the contact surfaces between the contact disks and the piezoceramic element and the stamp are then glued.
  • B. a high temperature resistant conductive adhesive can be used.
  • the contact disk can be glued onto a ceramic carrier made of A1-0 of the hybrid.
  • On the other side of the carrier 21 can also electronic components 23, such as. B. transistors, resistors, etc. be arranged in an evaluation circuit.
  • the electronic components 23 such as. B. transistors, resistors, etc.
  • the carrier 21 lies in the area of the transducer 19 with its underside against a counter bearing 25 pressed into the bore 12.
  • the counter bearing 25 has through bores 26 in the area of the electrical components.
  • the termination lines 27 of the electronic components 23 can be guided through these bores 26.
  • the line 27 is fastened in a grommet 29 of the cover 30 closing the bore 12.
  • the measured values are fed via line 27 to an evaluation circuit and control device of the internal combustion engine (not shown).
  • the housing is at least in. Area of the electronic components 23 poured out with a casting compound 31.
  • the counter bearing 25 has an extension 35 with which it rests on the underside of the carrier 21 in the area of the sensor 19.
  • a support of the support 21 on the counter bearing 25 in this area is necessary in order to prevent the support 21 from bending in the area of the receiver 19. Otherwise this would lead to incorrect measurements.
  • the bores 26 represent segment-like recesses, so that a star-like configuration of the counter bearing 25 is created.
  • the electronic components of the hybrid 22 are then combined into a number of subassemblies, which are each arranged in the region of the bores 26 on the underside of the carrier 21.
  • the electronic components 23 of the hybrid 22 can be grouped together in the area of a bore 26 to form an integrated circuit (IC), and in the other area of the bore there are the trimming resistors and in the area of a further bore the connections 27.
  • the counter bearing rests only with the extension 35 on the underside of the carrier 21, it is possible in the embodiment according to FIG. 3 to additionally support the carrier 21 on the edge 37 of the counter bearing 25.
  • a sealing ring 38 is arranged on the edge 37, on which the carrier 21 rests. This enables a low-stress mounting of the hybrid 22 on the counter bearing 25.
  • the sealing ring 38 instead of the sealing ring 38, however, as shown in FIG.
  • the edge 37a of the counterbearing 25a can rest on the underside of the carrier 21.
  • the additional lateral support of the carrier 21 on the edge 37a or the sealing ring 38 ensures that the pressure sensor is safe from breakage when it falls from a prescribed minimum height. Furthermore, the pressure sensor is thereby secured against shock loads.
  • the function of a pressure sensor is generally known and is therefore not explained in detail here.
  • the force acting on the transducer 19 via the membrane 14 and the plunger 18 produces a change in resistance in the case of a piezoresistive element, while in the case of a piezoceramic element or a quartz element it causes a surface charge caused by a change in polarization.
  • This measurement signal caused by the change in resistance or by the surface charge is supplied to the electronic components 23 of the hybrid 22. Only simple bond connections between the contact disks and the components or between the components 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.

Abstract

Capteur de pression (11) dans lequel le capteur (19), constitué par une résistance à couche épaisse piézorésistive ou par un matériau piézoélectrique, et les composants électroniques (23) d'un circuit de restitution électronique sont disposés sur le support (21) d'un hybride (22). Le support (21) est disposé dans la zone du capteur (19), sa face inférieure s'appliquant sur une butée (25). Dans la butée (25), des trous traversants (26) sont formés dans la zone des composants électroniques (23). Ces trous (26) permettent de ménager suffisamment d'espace pour les composants électroniques (23). En outre, ces composants électroniques (23) peuvent, même une fois montés, être égalisés de façon simple par ajustement au laser. Le capteur de pression ainsi obtenu est de dimensions relativement petites et peut être fabriqué à un coût avantageux.
PCT/DE1991/000524 1990-07-18 1991-06-27 Capteur de pression pour la mesure de la pression dans la chambre de combustion d'un moteur a combustion interne WO1992001913A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019920700304A KR920702490A (ko) 1990-07-18 1991-06-27 내연 기관의 연소실내의 압력 탐지용 압력 센서

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4022742.1 1990-07-18
DE4022742A DE4022742A1 (de) 1990-07-18 1990-07-18 Druckgeber zur druckerfassung im brennraum von brennkraftmaschinen

Publications (1)

Publication Number Publication Date
WO1992001913A1 true WO1992001913A1 (fr) 1992-02-06

Family

ID=6410463

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1991/000524 WO1992001913A1 (fr) 1990-07-18 1991-06-27 Capteur de pression pour la mesure de la pression dans la chambre de combustion d'un moteur a combustion interne

Country Status (5)

Country Link
EP (1) EP0493541A1 (fr)
JP (1) JPH05501307A (fr)
KR (1) KR920702490A (fr)
DE (1) DE4022742A1 (fr)
WO (1) WO1992001913A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19844278C1 (de) * 1998-09-26 2000-01-05 Porsche Ag Widerlager für eine Feder
GB2394055B (en) * 2002-10-11 2006-04-12 Univ Southampton Pressure sensor and production thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4567751A (en) * 1982-10-07 1986-02-04 Nippon Soken, Inc. Knocking detection device in diesel engine
US4620438A (en) * 1983-12-15 1986-11-04 Texas Instruments Incorporated Cylinder pressure transmitter for an internal combustion engine
FR2626670A1 (fr) * 1987-06-17 1989-08-04 Gazzano Maurice Capteur de pressions et de deformations

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4567751A (en) * 1982-10-07 1986-02-04 Nippon Soken, Inc. Knocking detection device in diesel engine
US4620438A (en) * 1983-12-15 1986-11-04 Texas Instruments Incorporated Cylinder pressure transmitter for an internal combustion engine
FR2626670A1 (fr) * 1987-06-17 1989-08-04 Gazzano Maurice Capteur de pressions et de deformations

Also Published As

Publication number Publication date
DE4022742A1 (de) 1992-01-23
EP0493541A1 (fr) 1992-07-08
KR920702490A (ko) 1992-09-04
JPH05501307A (ja) 1993-03-11

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