EP2783395A1 - Mechanical packaging technique of attaching mems and flex circuit - Google Patents
Mechanical packaging technique of attaching mems and flex circuitInfo
- Publication number
- EP2783395A1 EP2783395A1 EP12851847.9A EP12851847A EP2783395A1 EP 2783395 A1 EP2783395 A1 EP 2783395A1 EP 12851847 A EP12851847 A EP 12851847A EP 2783395 A1 EP2783395 A1 EP 2783395A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- assembly
- mems
- communications cable
- pressure
- 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- Withdrawn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
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
- G01L23/26—Details or accessories
-
- 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
- G01L19/0061—Electrical connection means
- G01L19/0084—Electrical connection means to the outside of the housing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2400/00—Control systems adapted for specific engine types; Special features of engine control systems not otherwise provided for; Power supply, connectors or cabling for engine control systems
- F02D2400/22—Connectors or cables specially adapted for engine management applications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
Definitions
- the present invention relates generally to combustion process technology and more particularly to accurately measure pressure values within an internal combustion engine (ICE).
- ICE internal combustion engine
- HCCI homogeneous charge compression ignition
- MEMS micro-electromechanical system
- the present invention fulfills these needs and has been developed in response to the present state of the art, and in particular, in response to the problems and needs in the art that have not yet been fully solved by currently available technologies.
- One embodiment of the present invention provides for a sensor assembly, comprising: a rigid sensor body adaptively configured for connection with an internal combusting device capable of generating a pressure during operation; wherein the body further comprises a tip and is adaptively configured for connection to the internal combusting device; a pressure sensing device configured at a predetermined position in relation to a distal opening of the tip; a flexible cable connection in electrical communication with the pressure sensing device and capable of transmitting an electrical signal having pressure characteristic information to an information receiving device in communication with the assembly, wherein the flexible cable connection further comprises an electronic communications board for electrical communication, a flexible communications cable for electrical communication with the information receiving device and an internal communications cable situated within the sensor body and in electrical communication with the pressure sensing device, the electronic communications cable being in electrical communication with the flexible communications cable and the internal communications cable.
- a mechanical packaging assembly for detecting pressure values in an internal combustion engine, the assembly comprising: a stainless steel assembly body capable of electrical communication via a connectable connection and in mechanical mated connection via a fastening to an internal combustion engine, a micro-electromechanical system (MEMS) pressure sensor for sensing pressure within the internal combustion engine, being bonded to a tip of the body positioned at a distal end and being in electrical communication with a flexible circuit connection, wherein the MEMS pressure sensor is situated at a predetermined distance from an opening of the tip; wherein the flexible circuit connection is capable of transmitting an electrical signal having pressure characteristic information from the MEMS pressure sensor to an information receiving device in communication with the assembly and the flexible circuit connection further comprises an electronic communications board for electrical communication, a flexible communications cable for electrical communication with the information receiving device and an internal communications cable situated within the assembly body and in electrical communication with the MEMS sensor, the electronic communications cable being in electrical communication with the flexible communications cable and the internal communications cable.
- MEMS micro-electromechanical system
- a further embodiment of the present invention provides for an internal combustion engine further including a pressure monitoring assembly comprising: a stainless steel body in electrical signal communication and mechanically fastened to the engine, a micro-electromechanical system (MEMS) pressure sensor secured to a tip of the body and in electrical signal communication via wire bonds to a flexible circuit connection, wherein the pressure sensor is situated less than 10mm from the tip and the flexible circuit connection is capable of transmitting an electrical signal having pressure characteristic information determined from the MEMS pressure sensor to a controller in communication with the assembly; wherein the flexible circuit connection is capable of transmitting an electrical signal having pressure characteristic information from the MEMS pressure sensor to the controller in communication with the assembly and the flexible circuit connection further comprises an electronic communications board for electrical communication, a flexible communications cable for electrical communication with the controller and an internal communications cable situated within the assembly body and in electrical communication with the MEMS sensor, the electronic communications cable being in electrical communication with the flexible communications cable and the internal communications cable; and wherein the body further comprises a mating means for securably fastening the assembly and the tip is
- the distance from the tip of the body to the pressure sensor is less than 12mm to provide for improved timeliness of signal transmissions.
- the configuration and adaptive configurations available for the present invention protect the MEMs sensor from excessive mechanical stresses due to thermal coefficient of expansion mismatch, as well as provide for a configured arrangement of components to electrically connect the MEMs pressure sensor to the power supply and sensing electronics, while providing operational characteristics to enable the assembly to operate within the operating environment of an internal combustion engine, for instance.
- the present invention in various aspects incorporates the use of MEMS based combustion sensors providing for direct pressure measurement activities without requiring further calibration systems on the engine.
- Figure 1 illustrates an arrangement of the combustion sensor in accordance with an aspect of the present invention.
- Figure 2 depicts a schematic of a combustion sensor assembly in accordance with an aspect of the present invention.
- Figure 3 illustrates a partially disassembled combustion sensor in accordance with an aspect of the present invention.
- Figure 4 sets forth a MEMS pressure sensor in accordance with an aspect of the present invention.
- Figure 5 illustrates a preferred embodiment of the present invention as a MEMS sensor electrical connection to power and control electronics.
- Figure 6 presents an embodiment of the present invention as a MEMS pressure sensor electrical connection incorporating MEMS sensor direct attachment to the flex circuit.
- Figure 7 presents a pictorial overview of the method of the present invention as attaching a MEMS sensor to a flex circuit.
- Figure 8 illustrates a preferred embodiment of the present invention as a MEMs pressure sensor electrical connection incorporating a ceramic printed circuit board between the MEMs sensor and the flex cable.
- the present invention disclosed provides for a rugged, compact sensing device for various implementations including those of automotive, marine, and other combustion technologies that require low cost accurate pressure sensing during internal combustion engine process.
- a MEMS sensor connection with a flexible circuit is presented and the communication of which is preferably achieved through the use of wire bond technology.
- This present invention provides for adaptively configuring a MEMS pressure sensor to be in close proximity to the pressure port for enabling real time pressure sensing.
- Figure 1 illustrates an arrangement of the combustion sensor in accordance with an aspect of the present invention.
- the sensor body 101 is shaped and comprised to provide structural rigidity to the sensor assembly 100, as well as mechanical fastening utilizing screw thread 102 that engages mating threads in the head of an internal combustion engine (not pictured).
- the senor body assembly 101 is fabricated from stainless steel.
- a suitably tapered tip 103 distal from the screw thread 102 forms a pressure tight seal with a pressure port in the head of the ICE.
- the tip 103 in a preferred embodiment, is configured to also provide reduction in temperature induced stresses on the pressure sensing MEMS assembly by its configuration and composition, as the tip is preferably fabricated from a material with a thermal coefficient of expansion similar to that of the MEMs assembly.
- the tip 103 is fabricated from KovarTM and preferably attached to the sensor body 101 by laser welding (KovarTM is a trademark of Carpenter Technology Corporation).
- Cable 104 provides the electrical connection necessary to communicate with other electronics in communications with the assembly such as control electronics (not pictured), for example.
- FIG. 2 depicts a schematic of a combustion sensor assembly 200 in accordance with an aspect of the present invention.
- Tip 203 provides proximate location and bonding surfaces to position and retain the pressure sensing element 205.
- the tip 203 is concentrically aligned with sensor body 201 and the pressure sensor 205 is a MEMS pressure sensor.
- MEMS sensor proximity to the pressure port provides a near immediate signal from the MEMS sensor and high resonant frequency response due to the minimum length of the air path within tip 203.
- the distance from the MEMS sensor 205 to the furthermost opening in tip 203 is of a predetermined distance less than 15mm. In a further preferred embodiment of the present invention, the distance from the MEMS sensor 205 to the furthermost opening in tip 203 is of a predetermined distance less than 10mm. In yet a further preferred embodiment of the present invention, the distance from the MEMS sensor 205 to the furthermost opening in tip 203 is of a predetermined distance approximating less than 8mm and being 7.72mm.
- the sensor assembly further includes internal flex cable 206, which is of a predetermined shape to provide the necessary electrical traces for circuit connection, as well as the critical features for completing the electrical connection to the MEMS sensor, as set forth in Figure 3.
- Figure 3 illustrates a partially disassembled combustion sensor 300 in accordance with an aspect of the present invention.
- printed circuit board 307 forms the interconnection between flex cable 306 and cable 304.
- board 307 and cable 304 are positioned and retained in sensor body 301 by wire cap 308 and preferably fabricated from stainless steel.
- a retaining ring 109 is also preferably utilized.
- printed circuit board 307 may function structurally as well to further facilitate the cable connection, or alternatively may contain one or more of those electronics necessary to operate the sensor assembly.
- Figure 4 sets forth a preferred embodiment 400 of a MEMS pressure sensor in accordance with an aspect of the present invention.
- Figure 5 illustrates a preferred embodiment of the present invention 500 as a MEMS sensor electrical connection to power and control electronics.
- MEMS sensor 405, 505 is permanently secured (i.e., attached) and sealed to tip 403, 503 by eutectic bond.
- the seal is hermetic and flex circuit 406, 506 is bonded to an inner surface of tip 403, 503 using a high temperature epoxy.
- MEMS sensor to flex circuit trace connection are also completed using wire bonds 410, 510.
- the bond wires may be gold, aluminum, or any metallic round or rectangular in shape that is appropriate for wire bonding.
- Figure 6 presents an embodiment 600 of the present invention as a MEMS pressure sensor electrical connection incorporating MEMS sensor direct attachment to the flex circuit.
- Figure 7 presents a pictorial overview 700 of the method of the present invention as attaching a MEMS sensor to a flex circuit.
- MEMS 602, 702 directly attached to the flex circuit 601 , 701 .
- the MEMs sensor assembly may have aluminum bond pads or gold bumps which will form the electrical connection to the flex circuit. Die pads are set forth at 603, 703.
- FIG 8 illustrates a preferred embodiment 800 of the present invention as a MEMs pressure sensor electrical connection incorporating a ceramic printed circuit board between the MEMs sensor and the flex cable.
- a MEMS sensor assembly 800 that is attached to the tip 805 by eutectic bond.
- a ceramic spacer 802 that includes wire bond pads is attached on the upper surface of the MEMS 803.
- the flex circuit 801 is attached to the ceramic spacer 802.
- a die pad is set forth at 804.
- the invention can be used in a variety of applications and implementation including those which monitor combustion pressures of internal combustion engines as may be used in the automotive, marine, aviation, and recreational vehicles, and any moving or stationary assemblies incorporating internal combustion engines, such as power generators and mobile generators. It may be incorporated in diesel engines and diesel engine applications as well.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201161563455P | 2011-11-23 | 2011-11-23 | |
US13/430,528 US8806925B2 (en) | 2011-11-23 | 2012-03-26 | Mechanical packaging technique of attaching MEMS and flex circuit |
PCT/US2012/063901 WO2013078006A1 (en) | 2011-11-23 | 2012-11-07 | Mechanical packaging technique of attaching mems and flex circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2783395A1 true EP2783395A1 (en) | 2014-10-01 |
EP2783395A4 EP2783395A4 (en) | 2015-09-02 |
Family
ID=48470205
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12851847.9A Withdrawn EP2783395A4 (en) | 2011-11-23 | 2012-11-07 | Mechanical packaging technique of attaching mems and flex circuit |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2783395A4 (en) |
JP (1) | JP5862991B2 (en) |
WO (1) | WO2013078006A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS635232A (en) | 1986-06-25 | 1988-01-11 | Nippon Soken Inc | Pressure detector |
JPS6312178A (en) | 1986-07-03 | 1988-01-19 | Nippon Soken Inc | Pressure detector |
JPH08261857A (en) | 1995-03-27 | 1996-10-11 | Matsushita Electric Ind Co Ltd | Pressure sensor |
US20050252299A1 (en) | 2004-05-17 | 2005-11-17 | Denso Corporation | Pressure detecting apparatus |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3602238B2 (en) * | 1996-01-30 | 2004-12-15 | 株式会社フジクラ | Semiconductor pressure sensor and method of manufacturing the same |
JP4638659B2 (en) * | 2003-05-21 | 2011-02-23 | 株式会社豊田中央研究所 | Pressure sensor |
DE102004043874A1 (en) * | 2004-09-10 | 2006-03-16 | Robert Bosch Gmbh | Device for detecting the pressure in a combustion chamber of an internal combustion engine |
WO2006110662A2 (en) * | 2005-04-08 | 2006-10-19 | Analatom, Inc. | Compact pressure-sensing device |
US20080297808A1 (en) * | 2005-12-06 | 2008-12-04 | Nabeel Agha Riza | Optical Sensor For Extreme Environments |
JP4383461B2 (en) * | 2007-03-14 | 2009-12-16 | 長野計器株式会社 | Sensor and sensor manufacturing method |
US7624642B2 (en) * | 2007-09-20 | 2009-12-01 | Rosemount Inc. | Differential pressure sensor isolation in a process fluid pressure transmitter |
EP2138820B1 (en) * | 2008-06-25 | 2016-09-21 | Sensata Technologies, Inc. | A piezoresistive pressure-measuring plug for a combustion engine |
JP4638934B2 (en) * | 2008-10-10 | 2011-02-23 | 株式会社豊田中央研究所 | Pressure sensor |
JP2010101778A (en) * | 2008-10-24 | 2010-05-06 | Denso Corp | Pressure sensor and manufacturing method therefor |
-
2012
- 2012-11-07 EP EP12851847.9A patent/EP2783395A4/en not_active Withdrawn
- 2012-11-07 JP JP2014543485A patent/JP5862991B2/en not_active Expired - Fee Related
- 2012-11-07 WO PCT/US2012/063901 patent/WO2013078006A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS635232A (en) | 1986-06-25 | 1988-01-11 | Nippon Soken Inc | Pressure detector |
JPS6312178A (en) | 1986-07-03 | 1988-01-19 | Nippon Soken Inc | Pressure detector |
JPH08261857A (en) | 1995-03-27 | 1996-10-11 | Matsushita Electric Ind Co Ltd | Pressure sensor |
US20050252299A1 (en) | 2004-05-17 | 2005-11-17 | Denso Corporation | Pressure detecting apparatus |
Non-Patent Citations (1)
Title |
---|
See also references of WO2013078006A1 |
Also Published As
Publication number | Publication date |
---|---|
JP5862991B2 (en) | 2016-02-16 |
JP2015501930A (en) | 2015-01-19 |
EP2783395A4 (en) | 2015-09-02 |
WO2013078006A1 (en) | 2013-05-30 |
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Effective date: 20181211 |