EP1240489A1 - Schwingungsaufnehmer mit einer druckhülse - Google Patents
Schwingungsaufnehmer mit einer druckhülseInfo
- Publication number
- EP1240489A1 EP1240489A1 EP00990537A EP00990537A EP1240489A1 EP 1240489 A1 EP1240489 A1 EP 1240489A1 EP 00990537 A EP00990537 A EP 00990537A EP 00990537 A EP00990537 A EP 00990537A EP 1240489 A1 EP1240489 A1 EP 1240489A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- pressure sleeve
- base surface
- assembly
- vibration sensor
- 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- Withdrawn
Links
- 238000002485 combustion reaction Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
- G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means 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
- G01L23/22—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 for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
- G01L23/221—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 for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
- G01L23/222—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 for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines using piezoelectric devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/24—Housings ; Casings for instruments
- G01D11/245—Housings for sensors
Definitions
- the invention relates to a vibration sensor with a pressure sleeve according to the preamble of the main claim.
- the vibrations to be detected are knocking noises of the internal combustion engine in operation, which, via the pressure pulses, act on a piezoceramic disk as the actual sensor element with contact disks and insulating disks in between, which enable signal tapping. are routed to generate an evaluable electrical output signal.
- this sensor arrangement in the pressure sleeve and the attachment of the vibration sensor to the vibrating component have a major influence here both on the method of manufacture and on any incorrect measurements and malfunctions in operation.
- the base surface of the pressure sleeve which is concave from the outside towards the central bore, is printed on the opposite surface on the component.
- the inner contact surface of the pressure sleeve on which the sensor element is clamped is also at the same angle at which the base surface is concave.
- a cavity can thus form between the contact surface and the sensor arrangement, here in particular the ceramic disk with the insulation and contact disks, in the radially inner region.
- the above-mentioned vibration sensor with a pressure sleeve in which the pressure sleeve can be attached under pressure with an initially concave base surface on a component causing vibrations, is advantageously further developed according to the invention in that for a sensor arrangement, the pressure surface of the pressure sleeve on an inside surface of the base surface opposite the base surface is held, the support surface has a radially inward convex contour before assembly.
- the contour of the support surface is dimensioned such that the sensor arrangement lies largely flat on the support surface after assembly.
- the base surface which has the concave contour before assembly, is changed by the pressure of the assembly, usually via a screw passed through a central hole.
- the angles at which the base surfaces are concave and the support surface are convex are approximately the same before assembly, for example in the range from 10 ⁇ to 20, so that they always run parallel in any case.
- Knock sensor as a vibration sensor are a piezoceramic for generating an electrical signal and a seismic mass above it, which are therefore always plane-parallel to each other.
- FIG. 1 shows a section through a knock sensor housing as a vibration sensor with a pressure sleeve according to the prior art
- FIG. 2 shows a detailed illustration of a pressure sleeve according to the invention.
- FIG. 1 shows a knock sensor for an internal combustion engine with an outer plastic housing 1, in which a pressure sleeve 2 is arranged, as a vibration sensor.
- the pressure sleeve 2 has a flange-like edge 3 in the region of its lower end on which it rests with its lower base surface 20 on the engine block, not shown here, whose vibrations are to be detected.
- the following parts are arranged on the outer circumference 4 of the pressure sleeve 2, starting from a lower support surface 21 on the flange-like edge 3: an insulating washer 5, a first contact washer 6, a piezoceramic washer 7 as the actual sensor element and, in turn, a second contact washer 6 and a second insulating washer 5.
- a seismic mass 8 is placed on this arrangement, which is printed with an annular spring 9 in the direction of the piezoceramic disk 7.
- the spring 9 is preloaded by a threaded ring 10 which is screwed onto an external thread 11 on the upper part of the pressure sleeve 2.
- Electrical connections 13 for the contact disks 6 and flat connectors 14 are injected into an integrated connection part 12 of the housing 1, which is produced in particular by a plastic injection molding process.
- the tabs 14 are thereby connected to the two contact disks 6, whereby there is an electrical connection to the two sides of the piezoceramic disk 7 via the two contact disks 6 and the electrical voltage which is generated in the axial direction when the piezoceramic disk 7 is subjected to pressure , is removable.
- a fastening screw can be guided through a central recess or a bore 15 m of the pressure sleeve 2, by means of which this knock sensor can be fastened directly or indirectly to the engine block of the internal combustion engine.
- the entire fastening screw described above is used Torque to which pressure sleeve 2 is transmitted via lower surface 20, ie no force acts on the piezoceramic disk 7 as a sensor element due to the attachment.
- a prestressing force acts here due to the pressure of the spring 9.
- the prestressing force is selected so that axial forces which can be tolerated on the piezoceramic disk 7 just without permanent deterioration of the electrical signal are effective, and these are also accompanied by thermal expansions and inevitable compression of the pressure sleeve 2 the assembly is largely independent.
- the impulses exerted by the seismic mass 8 in proportion to the vibrations of the internal combustion engine are converted in the piezoceramic disk 7 into charge impulses which can be evaluated on a corresponding device.
- the base surface 20 is conical, which drops towards the bore 15 and thus an elevation occurs in the outer region of the flange-like edge 3. Due to the conical shape of the base surface 20, the pressure sleeve 2 can now be fully pressed onto the fastening surface of the engine block.
- FIG. 2 shows a detailed representation of a printing sleeve 22 according to the invention, in which not only a conical contour of the base surface 20 but also a modification of the printing sleeve 2 according to FIG. 1 has a correspondingly convex profile of the support surface 21.
- the angle ⁇ is the conical contour of the base surface 20 and the angle ß of the convex contour of the bearing surface 21 is relatively small, for example 10 ⁇ to 20 ⁇ , steel or brass being used as the material for the pressure sleeve 22.
- Both angles ⁇ and ⁇ are preferably of the same size, so that in particular the piezoceramic 7 and the seismic mass 8 always lie plane-parallel on one another after assembly.
- angles .alpha. And .beta. should lie entirely or predominantly in the elastic region of the material of the pressure sleeve 22 used, so that due to the so-called residual elasticity when the fastening screw is loosened, the conical shape can almost revert again.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19960325A DE19960325B4 (de) | 1999-12-15 | 1999-12-15 | Schwingungsaufnehmer mit einer Druckhülse |
DE19960325 | 1999-12-15 | ||
PCT/DE2000/004470 WO2001044771A1 (de) | 1999-12-15 | 2000-12-14 | Schwingungsaufnehmer mit einer druckhülse |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1240489A1 true EP1240489A1 (de) | 2002-09-18 |
Family
ID=7932650
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00990537A Withdrawn EP1240489A1 (de) | 1999-12-15 | 2000-12-14 | Schwingungsaufnehmer mit einer druckhülse |
Country Status (6)
Country | Link |
---|---|
US (1) | US6807863B2 (ko) |
EP (1) | EP1240489A1 (ko) |
JP (1) | JP4800539B2 (ko) |
KR (1) | KR100744963B1 (ko) |
DE (1) | DE19960325B4 (ko) |
WO (1) | WO2001044771A1 (ko) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4909066B2 (ja) * | 2003-02-05 | 2012-04-04 | キストラー ホールディング アクチエンゲゼルシャフト | 初期応力デバイスを備える測定センサ |
JP3983755B2 (ja) * | 2004-09-30 | 2007-09-26 | 三菱電機株式会社 | ノックセンサ |
DE102013207914A1 (de) | 2013-04-30 | 2014-10-30 | Robert Bosch Gmbh | Verfahren zur Signaleinstellung bei Klopfsensoren |
DE102014215763A1 (de) | 2014-08-08 | 2016-02-11 | Robert Bosch Gmbh | Schwingungsaufnehmer zum Aufnehmen von Schwingungen eines Schwingungen verursachenden Bauteils |
KR102520910B1 (ko) | 2015-10-08 | 2023-04-13 | 한국단자공업 주식회사 | 감지장치 |
KR102499817B1 (ko) | 2015-11-25 | 2023-02-15 | 한국단자공업 주식회사 | 감지장치 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0158131U (ko) * | 1987-10-05 | 1989-04-11 | ||
EP0333091B1 (en) * | 1988-03-15 | 1992-10-21 | Pfister GmbH | Transducer for picking-up pressures, vibrations and/or accelerations and converting them into electrical signals |
US4838090A (en) * | 1988-09-30 | 1989-06-13 | Dwyer Instruments, Inc. | Multicoil bourdon tube type pressure gauge |
DE4307092B4 (de) * | 1992-04-18 | 2008-08-21 | Neumayer Tekfor Holding Gmbh | Mutter, insbesondere Radmutter |
DE4403660B4 (de) * | 1993-04-10 | 2006-08-10 | Robert Bosch Gmbh | Druckhülse |
FR2703772B1 (fr) * | 1993-04-10 | 1995-05-19 | Bosch Gmbh Robert | Douille de pression, notamment pour un capteur de cognement. |
FR2715737B1 (fr) * | 1994-02-01 | 1996-03-01 | Siemens Automotive Sa | Capteur accélérométrique pour mesure du cliquetis d'un moteur à combustion interne. |
JPH08219871A (ja) * | 1995-02-16 | 1996-08-30 | Toyota Motor Corp | 内燃機関用ノッキングセンサ |
DE19524147C2 (de) * | 1995-07-03 | 1998-01-29 | Bosch Gmbh Robert | Schwingungsaufnehmer mit einer Druckhülse |
JPH10267746A (ja) * | 1997-03-24 | 1998-10-09 | Ngk Spark Plug Co Ltd | ノッキング検出センサ |
DE19727703A1 (de) * | 1997-06-30 | 1999-01-14 | Bosch Gmbh Robert | Schwingungsaufnehmer mit Druckhülse |
JP3573325B2 (ja) * | 1998-01-15 | 2004-10-06 | 日本特殊陶業株式会社 | ノッキング検出センサの取付けアダプタ及びそれを用いたノッキング検出センサユニット |
JP3475840B2 (ja) * | 1999-03-03 | 2003-12-10 | 株式会社デンソー | ノックセンサ |
DE10044478C2 (de) * | 2000-09-08 | 2002-11-28 | Bosch Gmbh Robert | Schwingungsaufnehmer bzw. Isolierscheibe für einen Schwingungsaufnehmer |
JP3910030B2 (ja) * | 2001-09-19 | 2007-04-25 | 日本特殊陶業株式会社 | 内燃機関のノッキング検出装置 |
-
1999
- 1999-12-15 DE DE19960325A patent/DE19960325B4/de not_active Expired - Lifetime
-
2000
- 2000-12-14 JP JP2001545814A patent/JP4800539B2/ja not_active Expired - Fee Related
- 2000-12-14 KR KR1020027007582A patent/KR100744963B1/ko active IP Right Grant
- 2000-12-14 US US10/149,834 patent/US6807863B2/en not_active Expired - Fee Related
- 2000-12-14 EP EP00990537A patent/EP1240489A1/de not_active Withdrawn
- 2000-12-14 WO PCT/DE2000/004470 patent/WO2001044771A1/de not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO0144771A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2001044771A1 (de) | 2001-06-21 |
US6807863B2 (en) | 2004-10-26 |
JP2003517596A (ja) | 2003-05-27 |
KR100744963B1 (ko) | 2007-08-02 |
US20030154765A1 (en) | 2003-08-21 |
DE19960325B4 (de) | 2008-04-30 |
KR20020065567A (ko) | 2002-08-13 |
JP4800539B2 (ja) | 2011-10-26 |
DE19960325A1 (de) | 2001-06-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE60035854T2 (de) | Anordnungstruktur eines Motorteils mit Verbrennungsdrucksensor in der Maschine | |
DE4403660B4 (de) | Druckhülse | |
EP0993596B1 (de) | Schwingungsaufnehmer mit druckhülse | |
DE3880263T2 (de) | Piezoelektrischer aufnehmer. | |
EP0184666B1 (de) | Klopfsensor | |
DE19829379C2 (de) | Schwingungsaufnehmer mit einer Druckhülse | |
DE19960328B4 (de) | Schwingungsaufnehmer mit einer Druckhülse | |
DE19524152C1 (de) | Schwingungsaufnehmer | |
DE10044478C2 (de) | Schwingungsaufnehmer bzw. Isolierscheibe für einen Schwingungsaufnehmer | |
EP1240489A1 (de) | Schwingungsaufnehmer mit einer druckhülse | |
DE102011004144A1 (de) | Schwingungsaufnehmer und Verfahren zum Herstellen eines derartigen Schwingungsaufnehmers | |
DE19524147C2 (de) | Schwingungsaufnehmer mit einer Druckhülse | |
DE19829410A1 (de) | Schwingungsaufnehmer | |
DE19612540B4 (de) | Schwingungsaufnehmer mit Druckhülse | |
DE10009169B4 (de) | Schwingungsaufnehmer mit einer Druckhülse | |
DE19829409C2 (de) | Schwingungsaufnehmer mit einer Druckhülse | |
DE19524146C2 (de) | Schwingungsaufnehmer | |
DE19524148C1 (de) | Schwingungsaufnehmer | |
WO2001044756A2 (de) | Schwingungsaufnehmer mit einer druckhülse | |
DE19524149C2 (de) | Schwingungsaufnehmer | |
DE19829407A1 (de) | Schwingungsaufnehmer mit einer Druckhülse | |
DE19829408C2 (de) | Schwingungsaufnehmer mit einer Druckhülse | |
DE19727702A1 (de) | Druckhülse für Schwingungsaufnehmer | |
DE69226025T2 (de) | Vorrichtung zur Erfassung von Zylinderinnendruckänderungen | |
DE10044483A1 (de) | Schwingungsaufnehmer sowie Verfahren zur Herstellung eines Schwingungsaufnehmers |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20020715 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
RBV | Designated contracting states (corrected) |
Designated state(s): DE ES GB IT |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20060701 |