EP2558826A1 - Luftmassenmesser - Google Patents
LuftmassenmesserInfo
- Publication number
- EP2558826A1 EP2558826A1 EP11713804A EP11713804A EP2558826A1 EP 2558826 A1 EP2558826 A1 EP 2558826A1 EP 11713804 A EP11713804 A EP 11713804A EP 11713804 A EP11713804 A EP 11713804A EP 2558826 A1 EP2558826 A1 EP 2558826A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sensor
- sensor chip
- air mass
- region
- mass meter
- 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.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
- G01F1/688—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow using a particular type of heating, cooling or sensing element
- G01F1/69—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow using a particular type of heating, cooling or sensing element of resistive type
- G01F1/692—Thin-film arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
- G01F1/6845—Micromachined devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/696—Circuits therefor, e.g. constant-current flow meters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F5/00—Measuring a proportion of the volume flow
Definitions
- the invention relates to an air mass meter with a sensor chip, wherein the sensor chip is constructed as a micro-electro-mechanical system and has a sensor element, an electronic ⁇ cal evaluation circuit and an electronic oscillator and wherein the sensor chip is mounted on a support member with an adhesive.
- Air mass meters are suitable for detecting a mass flow of a fluid in a flow channel.
- a flow channel may for example be an intake tract of an internal combustion engine.
- the air mass senmesser mass flow diagnoses can be performed, and also take control of the internal combustion engine, for example, the operation of the internal combustion engine. For these purposes, it is important to record the actual mass flow reliably and as accurately as possible even under different operating conditions.
- DE 197 24 659 A1 discloses a mass flow sensor device comprising a sensor element.
- the sensor element is arranged and integrated on a separate chip. Further, an evaluation is disclosed, which is separately formed, but is electrically coupled to the sensor unit.
- DE 101 35 142 A1 discloses a mass flow sensor device having a housing body in which a sensor element of a mass flow sensor is arranged.
- the housing body has an input region from which a medium flow flows into a measuring channel in which the sensor element is arranged. Furthermore, the housing body has a precipitation opening, from which liquid and solid particles flow and thus flow past the measurement channel.
- the object of the invention is to provide an air mass meter, which allows a particularly reliable and accurate aus ⁇ evaluation. The object is solved by the features of the independent claim. Advantageous embodiments of the invention are characterized in the subclaims.
- the invention is characterized in that the sensor chip is divided into a first region and a second region, wherein the attachment of the sensor chip to the carrier element with the adhesive takes place exclusively in the first region and the sensor element and the oscillator are arranged in the second region.
- the bonding of the sensor chip to the carrier element leads to a first region in which it can come by thermal influences to enormous material stresses.
- the different coefficients of thermal expansion of the material of the carrier element and the sensor chip lead to a material stress, which has a particular effect on certain electronic circuits.
- the oscillator works very stable, which is a high-quality time standard available for data processing.
- the sensor element is protected by its stress-free arrangement from mechanical stresses, which increases its life and on the other ⁇ ren a particularly accurate measurement of a mass flow made ⁇ light.
- the carrier element is designed as a stamped sheet metal part. Stamped sheet metal parts are known as lead frames and they are widely used because of their günsti ⁇ gen production costs. Especially as carriers for sensor elements and electronic circuits for the automotive industry, stamped sheet metal parts have proven particularly useful .
- the sensor element is designed as a membrane. On the membrane, a first and a second temperature sensor and a heating element may be formed. Such a designed sensor element has particularly good sensor properties. The passing air masses can be detected very accurately and quickly with this sensor element.
- FIG. 1 shows a side view of an air mass meter
- FIG. 2 shows a plan view of the air mass meter known from FIG. 1,
- Figure 3 shows the air mass meter known from Figures 1 and 2 in its installed position in a flow channel.
- FIG. 1 shows an air mass meter 1 with a sensor chip 2 and a carrier element 7.
- the carrier element 7 can be used as a
- the sensor chip 2 has evaluation electronics 5, a sensor element 4 and an oscillator 3.
- the sensor element 4 can be applied as a membrane on the sensor chip 2 in micromechanical processing.
- the oscillator 3 is designed as an electronic circuit and necessary for accurate and accurate data processing. It is important that the oscillator 3 oscillates at a mög ⁇ lichst precise and always constant frequency.
- the sensor chip 2 is applied to the carrier element 7 with an adhesive material ⁇ . 6
- the support member 7 may be made of metal, for example, and the sensor chip 2 made of silicon. Metals and silicon have different coefficients of thermal expansion , so that when there is a change in temperature, mechanical stress on the sensor chip 2 in the sensor chip 2 occurs first area 10 is coming.
- the sensor chip 2 has a second region 9, which is stress-free, since it has no adhesive connection to the carrier element 7. In this second area, both the oscillator 3 and the sensor element 4 is formed ⁇ .
- the arrangement of the sensor element 4 and the Oszilla ⁇ sector 3 in the stress-free second region 9 leads to a very accurate measurement result of the air mass meter 1.
- the oscillator 3 can oscillate at a precisely fixed and fixed frequency, and on the other are applied in the sensor element 4 mechanical components are not mechanically loaded, so that a particularly accurate Erfas ⁇ tion of the air mass flow can be done.
- bonding wires 8 can be seen in FIG. 1, which electrically connect the sensor chip 2 to the carrier element 7.
- the Samele ⁇ ment 7, which may be formed, for example, as a leadframe a connection to the subsequent electronics in the motor vehicle is made. This may be, for example, an engine control unit.
- Figure 2 shows a plan view of the prior art of Figure 1 the air mass meter 1.
- the sensor chip 2 with the oscillator 3, the sensor element 4 and the transmitter 5.
- the adhesive 6 to ⁇ interpreted, of the sensor chip 2 the carrier element 7 ver ⁇ binds.
- a first region 10 is created, which is subjected to mechanical stress due to temperature changes.
- a second region 9 which is completely stress-free, the oscillator 3 and the sensor element 4 are arranged.
- the Bonddräh ⁇ te 8 can be seen connecting the sensor chip to the carrier element 7 electrically.
- an air mass meter 1 is shown, which may be arranged for example in a motor vehicle.
- the air mass meter 1 is arranged in a flow channel 11 and in this a fluid flow, such.
- the flow channel 11 is formed, for example, as a bypass channel of a housing body 13, which is preferably arranged ⁇ downstream downstream of an air filter in an intake ⁇ tract an internal combustion engine of the motor vehicle.
- the flow channel 11 is delimited by an upper channel wall and a lower channel wall of the housing body 13.
- the housing body 13 is typically configured to supply a portion of the air stream in the intake tract via a pre give ⁇ NEN course of the bypass channel to the air mass meter 1 without larger particles, such. As sand or dust particles to carry. Such particles can destroy the Heilmas ⁇ senmesser 1 and make us unusable.
- a predetermined flow direction 12 of the fluid flow in the flow channel 11 is shown in FIG. 3 by means of an arrow.
- the sensor chip 2 of the air mass meter 1 is preferably designed as a micro-electro-mechanical system (MEMS).
- An evaluation electronics 5, a sensor element 4 and an oscillator 3 are integrated on the sensor chip 2.
- the sensor element 4 has a cantilevered membrane, which is formed, for example, as a silicon nitride and / or silicon oxide layer and, for example, has a membrane thickness of 5 ⁇ m.
- the membrane is arranged in a frame of the sensor chip 2.
- the membrane is produced, for example, by means of etching of a silicon wafer which is coated with the silicon nitride and / or silicon oxide layer.
- a first and a second temperature sensor and a heating element are arranged on the membrane.
- the first and second temperature sensors are designed, for example, as thermocouples which, based on the sea basin Effect each provide a respective voltage which is representative of a respective temperature, which is detected by means of the respective temperature sensor.
- the heating element is formed for example as a resistance element, which is preferably disposed along a central longitudinal axis of the air mass senmessers 1 on the membrane.
- the resistance element comprises at least one conductor track which heats the membrane due to a current flow through the at least one conductor track.
- the first and second temperature ⁇ sensor are arranged on a surface of the membrane on which the heating element is arranged.
- the first and second temperature sensors are arranged laterally of the heating element on different sides of the heating element.
- the air mass sensor 1 is preferably arranged in the Strö ⁇ flow duct 11, that a surface of the sensor chip 2, on which the sensor element 4 and the evaluation electronics 5 are ⁇ arranged to, is oriented substantially parallel to the flow direction of the fluid flow.
- the evaluation electronics 5 are designed to determine a temperature difference as a function of the respectively provided voltage of the first and second temperature sensor and the detected temperature represented thereby, and to make available a sensor signal at a connection integrated on the sensor chip 2 on the output side thereof. len.
- the sensor signal is representative of a mass flow of the fluid flow through the flow channel 11.
- the connection can be designed, for example, as bond pads, which allow an electrical connection to the carrier element 7 and thus to the following vehicle electronics with bonding wires 8.
- the evaluation electronics 5 may be coated on the sensor chip S at least in regions with a protective layer C in order to to prevent damage by dirt particles in the air flow.
- a protective layer C in order to prevent damage by dirt particles in the air flow.
- only the portion of the Ausreteelekt ⁇ ronik 5 is coated with the protective layer, in particular of the directly ⁇ sondere during operation of the internal combustion engine of
- Motor vehicle is the fluid flow in the flow channel FC divided ⁇ sets.
- the entire area of the evaluation electronics 5 on the sensor chip 2 may be coated with the protective layer.
- the protective layer is applied to the sensor chip 2 in such a way that the sensor element 4 is not coated.
- the protective layer is formed as a polyimide layer being ⁇ and is applied in a manufacturing step of the mass flow sensor LMM produced in MEMS process steps to the corresponding area of the sensor chip. 2
- the mass flow sensor LMM is preferably already assembled or manufactured before the application of the protective layer and / or can already be used to determine the mass flow.
- a polyimide plastic can be dissolved in a solvent and sprayed onto the corresponding regions of the sensor chip 2. Thereafter, the solvent evaporates and by means of heating of the sensor chip S, the reaction takes place in the finished polyimide layer.
- ⁇ play a layer thickness of 5 is applied ⁇ to ensure adequate protection against moisture and particles in the fluid stream.
- the entire sensor chip S can be subjected to the polyimide layer and, in a subsequent production step, the region of the sensor element SU and possibly further regions of the sensor chip S can be selectively removed from the polyimide layer .
- the polyimide may be applied in a single manufacturing step already selectively on the sensor chip S, wherein at least the portions of the sensor element 2 ⁇ be omitted.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010015522 DE102010015522B4 (de) | 2010-04-16 | 2010-04-16 | Luftmassenmesser |
PCT/EP2011/055669 WO2011128315A1 (de) | 2010-04-16 | 2011-04-12 | Luftmassenmesser |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2558826A1 true EP2558826A1 (de) | 2013-02-20 |
Family
ID=43495560
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11713804A Ceased EP2558826A1 (de) | 2010-04-16 | 2011-04-12 | Luftmassenmesser |
Country Status (7)
Country | Link |
---|---|
US (1) | US9134159B2 (de) |
EP (1) | EP2558826A1 (de) |
JP (1) | JP5579320B2 (de) |
KR (1) | KR101768736B1 (de) |
CN (1) | CN102844646A (de) |
DE (1) | DE102010015522B4 (de) |
WO (1) | WO2011128315A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8640552B2 (en) * | 2011-09-06 | 2014-02-04 | Honeywell International Inc. | MEMS airflow sensor die incorporating additional circuitry on the die |
DE102011089898A1 (de) * | 2011-12-23 | 2013-06-27 | Continental Automotive Gmbh | Verfahren zum Betreiben eines Luftmassensensors |
DE112018003485T5 (de) * | 2017-09-29 | 2020-03-19 | Hitachi Automotive Systems, Ltd. | Detektionsvorrichtung für physikalische Größen |
DE102017218893A1 (de) * | 2017-10-23 | 2019-04-25 | Robert Bosch Gmbh | Sensoranordnung zur Bestimmung wenigstens eines Parameters eines durch einen Messkanal strömenden fluiden Mediums |
DE102020211142B4 (de) * | 2020-09-03 | 2022-08-18 | Vitesco Technologies GmbH | Gassensor für ein Fahrzeug |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2846518B2 (ja) * | 1992-03-18 | 1999-01-13 | 株式会社日立製作所 | 空気流量検出器及びそれを使用したエンジン制御装置 |
DE4219454C2 (de) | 1992-06-13 | 1995-09-28 | Bosch Gmbh Robert | Massenflußsensor |
DE19524634B4 (de) | 1995-07-06 | 2006-03-30 | Robert Bosch Gmbh | Vorrichtung zur Messung der Masse eines strömenden Mediums |
JP3310167B2 (ja) | 1996-06-12 | 2002-07-29 | 株式会社ユニシアジェックス | 気体流量計測装置 |
DE19744997A1 (de) | 1997-10-11 | 1999-04-15 | Bosch Gmbh Robert | Vorrichtung zur Messung der Masse eines strömenden Mediums |
JP2000146654A (ja) * | 1998-11-13 | 2000-05-26 | Fuji Electric Co Ltd | 熱式質量流量計 |
JP3587734B2 (ja) | 1999-06-30 | 2004-11-10 | 株式会社日立製作所 | 熱式空気流量センサ |
DE10135142A1 (de) | 2001-04-20 | 2002-10-31 | Bosch Gmbh Robert | Vorrichtung zur Bestimmung zumindest eines Parameters eines in einer Leitung strömenden Mediums |
JP2008020193A (ja) | 2006-07-10 | 2008-01-31 | Mitsubishi Electric Corp | 熱式流量センサ |
-
2010
- 2010-04-16 DE DE201010015522 patent/DE102010015522B4/de active Active
-
2011
- 2011-04-12 JP JP2013504233A patent/JP5579320B2/ja active Active
- 2011-04-12 WO PCT/EP2011/055669 patent/WO2011128315A1/de active Application Filing
- 2011-04-12 EP EP11713804A patent/EP2558826A1/de not_active Ceased
- 2011-04-12 CN CN2011800192152A patent/CN102844646A/zh active Pending
- 2011-04-12 US US13/641,679 patent/US9134159B2/en not_active Expired - Fee Related
- 2011-04-12 KR KR1020127029951A patent/KR101768736B1/ko active IP Right Grant
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO2011128315A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102010015522A1 (de) | 2011-02-24 |
US9134159B2 (en) | 2015-09-15 |
CN102844646A (zh) | 2012-12-26 |
WO2011128315A1 (de) | 2011-10-20 |
JP5579320B2 (ja) | 2014-08-27 |
KR20130103323A (ko) | 2013-09-23 |
DE102010015522B4 (de) | 2011-09-01 |
JP2013525756A (ja) | 2013-06-20 |
US20130031959A1 (en) | 2013-02-07 |
KR101768736B1 (ko) | 2017-08-16 |
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Legal Events
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: VITESCO TECHNOLOGIES GMBH |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
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18R | Application refused |
Effective date: 20200206 |