WO1994029686A1 - Druckgeber zur druckerfassung im brennraum von brennkraftmaschinen - Google Patents
Druckgeber zur druckerfassung im brennraum von brennkraftmaschinen Download PDFInfo
- Publication number
- WO1994029686A1 WO1994029686A1 PCT/DE1994/000549 DE9400549W WO9429686A1 WO 1994029686 A1 WO1994029686 A1 WO 1994029686A1 DE 9400549 W DE9400549 W DE 9400549W WO 9429686 A1 WO9429686 A1 WO 9429686A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- membrane
- housing
- pressure
- bead
- bore
- Prior art date
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 19
- 239000012528 membrane Substances 0.000 claims abstract description 50
- 238000005259 measurement Methods 0.000 claims abstract description 5
- 239000011324 bead Substances 0.000 claims description 24
- 238000001514 detection method Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 230000035939 shock Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- NPRYCHLHHVWLQZ-TURQNECASA-N 2-amino-9-[(2R,3S,4S,5R)-4-fluoro-3-hydroxy-5-(hydroxymethyl)oxolan-2-yl]-7-prop-2-ynylpurin-8-one Chemical compound NC1=NC=C2N(C(N(C2=N1)[C@@H]1O[C@@H]([C@H]([C@H]1O)F)CO)=O)CC#C NPRYCHLHHVWLQZ-TURQNECASA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 239000011195 cermet Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/04—Means for compensating for effects of changes of temperature, i.e. other than electric compensation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/14—Housings
-
- 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 transmitter according to the type of claim 1.
- a pressure transmitter for example known from DE-OS 41 03 705.7
- a stamp is arranged in a housing bore, which stamps the pressure to be determined on a receiving element transmits.
- the opening facing the combustion chamber is closed with the aid of a membrane which also bears against the stamp.
- membrane shapes are described there, but none of them allow effective compensation of the thermal shock error.
- This thermal shock error has a decisive influence on the accuracy of the measurement signal generated by the recording element. This error arises due to the large temperature gradient, especially in the area of the membrane and the front housing area. Since the pressure transmitter projects into the combustion chamber, its end region in particular has contact with the membrane with the flame and thus with the very high temperature prevailing there.
- the pressure transducer according to the invention with the characterizing features of claim 1 has the advantage over the fact that an elimination of the thermal shock error is achieved with simple design measures.
- the influence of the materials used on the thermal shock error can also be eliminated by the selection of the structural parameters, in particular the bead depth and the bead radius.
- Membranes which can be produced very easily and inexpensively, in particular membranes produced by embossing or deep-drawing processes, can be used.
- the entire structure of the combustion chamber sensor is very simple and inexpensive. Complicated water cooling that keeps the thermal shock error low is no longer necessary and can therefore be dispensed with.
- the membrane can be attached to the housing at low cost by placing a centering ring and welding the membrane in the area of the end face on the housing, for example using the laser welding method.
- the solution found in this way has a high long-term stability and thus guarantees use of the pressure sensor with very low errors over a long period of time.
- the construction also has an effect on a very good linearity of the transmission of the pressure with the aid of the membrane and the stamp on the measuring element.
- the pressure transmitter can also be manufactured with a significantly reduced diameter compared to the previous designs.
- 10 denotes the housing of a pressure transmitter 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 by a membrane 14.
- the membrane 14 is particularly advantageously formed from a superalloy, ie from an alloy of approximately 50% nickel, 20% chromium, 20% iron.
- a plunger 18 bears at one end, the other end abutting a piezoresistive measuring element 19.
- Piezoresistive measuring elements are understood to mean elements which change their resistance value under the action of pressure.
- Thick film resistors can be used for this purpose, for example. Cermet, contactivplastic or metal etc. can be used as materials for this.
- the measuring element 19 is printed on the carrier 22 of a hybrid. Under a hybrid is usually a carrier with printed circuit parts, such as Resistors and conductor tracks etc. with semiconductors such as ICs (Integrated Circuit), which are placed on the carrier and are connected to the circuit parts, for example by bond wires.
- the housing 10 and the stamp 18 consist of a corrosion-resistant steel with high strength, for example X2CrNiMoN 22 5 3.
- the end 20 of the plunger 18 facing the hybrid can be conical, so that its end 20 has approximately the diameter of the measuring element 19. This makes it possible to guide the punch 18 in the bore 12, but on the other hand to limit the area of the pressure transmission to the size of the measuring element 19.
- the carrier 22 of the hybrid also bears against a counter bearing 23 pressed into the bore 12.
- the electronic components 25 of the evaluation circuit are also located on the same side of the carrier 22 of the hybrid ⁇ tracks 27 connected.
- the output of the conditioning circuit is led via line 28 to an evaluation circuit and control device of the internal combustion engine, not shown.
- the counter bearing 23 has an approximately axially parallel, continuous bore 29 running to the bore 12, in which the discharge line 28 is guided.
- the line 28 is fastened in a grommet 30 of the cover 31 closing the bore 12.
- the bore 12 in the area of the piezoresistive measuring element 19 and the electronic components 25 and in the area between the counter bearing 23 and the cover 31 is filled with a sealing compound 32.
- measuring elements which operate according to other measuring principles.
- piezoelectric elements could be used.
- the membrane 14 and the housing web are formed in the region of the opening 13 of the bore 12.
- the membrane has an inwardly directed bead 35, i.e. it is bent into the interior of the bore 12.
- This bead 35 is formed approximately in the middle and is preferably located in the contact area 36 of the membrane 14 on the punch 18.
- the depth of the bead 35 is referred to as the bead depth h.
- a recess 37 is formed from the opening 13, which has a depth S.
- Diameter of the membrane 14 is 2R.
- the diameter of the recess 37 is designated 2R in the drawing and is
- the pressure transmitter 11 is inserted into the housing wall of the combustion chamber, so that it projects into the combustion chamber with the membrane 14.
- the membrane 14 As a result, there is a maximum temperature on the membrane surface, while there is a temperature drop toward the measuring element 19.
- This thermal shock error falsifies the measurement signal.
- the deformation of the individual components caused by the temperature gradient is now explained below. If one looks at the housing web, one obtains a funnel-shaped bulge, which is referred to below as a funnel effect.
- the heat conduction in the housing results in an exponential temperature distribution over the axial length of the housing web, ie the temperature decreases exponentially in the direction of the measuring element.
- the end face 16 of the housing web is also inclined due to the funnel effect. This change in inclination of the housing web surface (end face 16) is also forced on the membrane 14 resting on the housing web surface.
- the diaphragm is flat, ie it does not have a bead, this forced change in inclination leads to a sharp decrease in the preload force of the spring. This means that the membrane would have a bulge in the area of the stamp.
- the radial expansion of the membrane leads to a sharp decrease in the pretensioning force of the membrane in the case of no bead.
- a direction of deformation is specified.
- the bead 35 ie in particular the bevel, causes an increase in the real length of the membrane when the membrane is stretched while the radius of the membrane remains constant. The bead thus increases the thermal expansion of the membrane in the radial direction without the membrane losing its pretensioning force.
- the ratio of the rigidity in the radial direction of the membrane to the bending rigidity of the housing web determines the proportion of the radial expansion of the membrane that leads to the curvature and thus to an axial deformation of the membrane. leads in the middle, and the portion that leads to the above-mentioned funnel effect, ie the bulging of the housing web.
- the radial effect of the membrane predominantly causes an axial displacement, that is, a bulging of the membrane center.
- the radial effect must compensate for both the change in inclination of the housing surface 16 and the radial expansion, ie the above-mentioned funnel effect of the housing.
- the membrane would have a bead depth h of approximately 20 .m for a complete compensation of the funnel and the radial effect. However, these bead depths are very difficult or difficult to achieve in terms of production technology.
- the housing connector set 35 enables membranes with a bead depth h of approximately 50 h, m.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019950705355A KR960702604A (ko) | 1993-06-09 | 1994-05-13 | 내연기관 연소실 압력 감지용 압력 변환기(Druckgeber zur druckerfassung im brennraum von brennkraftmaschinen) |
EP94915025A EP0702783A1 (de) | 1993-06-09 | 1994-05-13 | Druckgeber zur druckerfassung im brennraum von brennkraftmaschinen |
JP7501169A JPH08511099A (ja) | 1993-06-09 | 1994-05-13 | 内燃機関の燃焼室内の圧力を検出するための圧力センサ |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP4319196.7 | 1993-06-09 | ||
DE4319196A DE4319196A1 (de) | 1993-06-09 | 1993-06-09 | Druckgeber zur Druckerfassung im Brennraum von Brennkraftmaschinen |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994029686A1 true WO1994029686A1 (de) | 1994-12-22 |
Family
ID=6490015
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1994/000549 WO1994029686A1 (de) | 1993-06-09 | 1994-05-13 | Druckgeber zur druckerfassung im brennraum von brennkraftmaschinen |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0702783A1 (de) |
JP (1) | JPH08511099A (de) |
KR (1) | KR960702604A (de) |
DE (1) | DE4319196A1 (de) |
WO (1) | WO1994029686A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0757237A2 (de) * | 1995-08-01 | 1997-02-05 | Endress + Hauser GmbH + Co. | Druckaufnehmer |
US20180113045A1 (en) * | 2015-04-16 | 2018-04-26 | Mikuni Corporation | Pressure sensor |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7263891B2 (en) * | 2004-05-17 | 2007-09-04 | Denso Corporation | Pressure detecting apparatus |
AT503664B1 (de) * | 2006-04-13 | 2007-12-15 | Piezocryst Advanced Sensorics | Piezoelektrischer drucksensor |
JP6114332B2 (ja) * | 2015-04-13 | 2017-04-12 | 日本特殊陶業株式会社 | 圧力センサ |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1573618B1 (de) * | 1965-04-23 | 1970-05-14 | Kistler Instrumente Ag | Membrane fuer Druckmesswandler |
DE1936528A1 (de) * | 1969-07-18 | 1971-01-28 | Erich Brosa | Bruck- und Kraftgeber |
DE3727221A1 (de) * | 1987-08-14 | 1989-02-23 | Siemens Ag | Sensor fuer druckkraft |
DE4013631A1 (de) * | 1989-04-28 | 1990-10-31 | Siemens Ag | Halterung fuer das piezoelektrische roehrchen eines drucksensors |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1156084A (fr) * | 1955-08-23 | 1958-05-12 | Mccormick & Company | Procédé de traitement de vanilles et extraits conformes à ceux obtenus |
-
1993
- 1993-06-09 DE DE4319196A patent/DE4319196A1/de not_active Withdrawn
-
1994
- 1994-05-13 JP JP7501169A patent/JPH08511099A/ja not_active Withdrawn
- 1994-05-13 EP EP94915025A patent/EP0702783A1/de not_active Withdrawn
- 1994-05-13 KR KR1019950705355A patent/KR960702604A/ko not_active Application Discontinuation
- 1994-05-13 WO PCT/DE1994/000549 patent/WO1994029686A1/de not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1573618B1 (de) * | 1965-04-23 | 1970-05-14 | Kistler Instrumente Ag | Membrane fuer Druckmesswandler |
DE1936528A1 (de) * | 1969-07-18 | 1971-01-28 | Erich Brosa | Bruck- und Kraftgeber |
DE3727221A1 (de) * | 1987-08-14 | 1989-02-23 | Siemens Ag | Sensor fuer druckkraft |
DE4013631A1 (de) * | 1989-04-28 | 1990-10-31 | Siemens Ag | Halterung fuer das piezoelektrische roehrchen eines drucksensors |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0757237A2 (de) * | 1995-08-01 | 1997-02-05 | Endress + Hauser GmbH + Co. | Druckaufnehmer |
EP0757237B1 (de) * | 1995-08-01 | 2002-04-10 | Endress + Hauser GmbH + Co. | Druckaufnehmer |
US20180113045A1 (en) * | 2015-04-16 | 2018-04-26 | Mikuni Corporation | Pressure sensor |
US10473547B2 (en) * | 2015-04-16 | 2019-11-12 | Mikuni Corporation | Piezoelectric pressure sensor with accommodation for thermal deformation |
Also Published As
Publication number | Publication date |
---|---|
EP0702783A1 (de) | 1996-03-27 |
JPH08511099A (ja) | 1996-11-19 |
KR960702604A (ko) | 1996-04-27 |
DE4319196A1 (de) | 1994-12-15 |
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