WO2016173703A1 - Capteur de mesure de la pression regnant dans un cylindre d'un vehicule automobile - Google Patents
Capteur de mesure de la pression regnant dans un cylindre d'un vehicule automobile Download PDFInfo
- Publication number
- WO2016173703A1 WO2016173703A1 PCT/EP2016/000658 EP2016000658W WO2016173703A1 WO 2016173703 A1 WO2016173703 A1 WO 2016173703A1 EP 2016000658 W EP2016000658 W EP 2016000658W WO 2016173703 A1 WO2016173703 A1 WO 2016173703A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor
- tubular
- cylinder
- longitudinal axis
- pressure
- Prior art date
Links
- 239000012528 membrane Substances 0.000 claims abstract description 40
- 230000005540 biological transmission Effects 0.000 claims description 22
- 238000010521 absorption reaction Methods 0.000 claims description 19
- 238000003466 welding Methods 0.000 claims description 19
- 230000000694 effects Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/08—Testing internal-combustion engines by monitoring pressure in cylinders
-
- 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
-
- 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
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
-
- 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
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
- G01L19/0681—Protection against excessive heat
Definitions
- the present invention relates to the field of electronic measurement sensors and relates more particularly to a pressure sensor and a motor vehicle comprising such a sensor.
- the invention is particularly applicable in the field of pressure measurement sensors mounted on motor vehicle engine cylinders.
- a motor vehicle comprising cylinders closed by a cylinder head for fuel combustion
- mount for each cylinder through a hole of the cylinder head, a sensor for measuring the pressure of the gases in said cylinder and generating a signal representing the variations of the value of this pressure over time.
- This signal is sent to a computer of the vehicle to control different parameters.
- the signal may be used by a computer to decide the optimum timing of fuel injection into the cylinder to improve engine operation and / or reduce pollutant emissions.
- this pressure sensor 1 comprises a tubular body 2 extending along a longitudinal axis Xi and a pressure sensitive element 3 mounted in said tubular body 2.
- the sensitive element 3 comprises a piezoelectric module 3A for converting a mechanical stress into an electrical voltage, a member 3B for transmitting said mechanical stress to the piezoelectric module 3A and a flange 3C for receiving the piezoelectric module 3A and the element transmission 3B.
- This flange 3C comprises a tubular portion 3C-1, a 3C-2 elastically deformable membrane and a shoulder 3C-3.
- the piezoelectric module 3A and the transmission member 3B are housed in the tubular portion 3C-1 which is itself mounted coaxially in the body 2.
- the membrane 3C-2 comprises a circular portion 3C-21 extending transversely in the tubular portion 3C-1 so as to obstruct it and a connecting protrusion 3C-22 extending from the center of said circular portion 3C-21 along the longitudinal axis Xi to connect the membrane 3C-2 to the transmission member 3B.
- the shoulder 3C-3 extends radially, relative to the longitudinal axis Xi, from the tubular portion 3C-1 to allow the attachment of the flange 3C to the body 2 by welding at a first weld S ! .
- the sensor 1 finally comprises a skirt 4 fixed by welding on the shoulder 3C-3 at a second weld S 2 .
- This skirt 4 has a "
- the membrane 3C-2 deforms under the effect of the pressure prevailing in the cylinder, thereby generating a mechanical stress transmitted by the transmission member 3B to the piezoelectric module 3A which converts it into an electrical voltage representing the pressure prevailing in the cylinder.
- the yoke can be deformed under the effect of temperature and engine stress, which can then cause a deformation of the sensor 1 and in particular the 3C-2 membrane. Such deformation of the membrane 3C-2 is likely to disturb the transmission of the mechanical stresses between the membrane 3C-2 and the piezoelectric module 3A and thus the operation of the sensor 1.
- the force fitting of the sensor 1 in the hole of the cylinder head may cause mechanical deformation of the skirt 4 and the shoulder 3C-3, subjected to forces E, so as to deform the membrane 3C-3. 2, which has the aforementioned drawbacks.
- the invention relates to a sensor for measuring the pressure in a cylinder of a motor vehicle, said sensor comprising a tubular body extending along a longitudinal axis and an element sensitive to variations in said pressure, mounted in a said tubular body, said sensing element comprising a piezoelectric module for converting a mechanical stress into an electrical voltage representing the value of the pressure prevailing in the cylinder, a member for transmitting said mechanical stress to the piezoelectric module and a receiving flange of the piezoelectric module and the transmission member, said flange comprising: A tubular portion mounted coaxially in the body and in which are housed the transmission member and the piezoelectric module,
- a fixing portion of the flange on the body extending radially, with respect to the longitudinal axis, from the tubular portion,
- the senor being remarkable in that the connecting zone and the fixing portion are separated by a non-zero distance along the longitudinal axis and in that the flange comprises, between the connection zone and the fixing portion, a portion absorption of a mechanical deformation.
- the absorption portion deforms when the flange is subjected to efforts.
- the absorption portion being located between the membrane connecting zone and the fastening portion of the flange on the body, the membrane is then protected from the forces to which the fastening portion is subjected.
- Such a sensor is thus protected from malfunctions related to the transmission of mechanical stresses from the membrane.
- the distance separating the connection zone and the fixing portion is greater than 1.5 mm in order to protect the membrane from temperature variations of the fixing portion.
- the absorption portion has at least a thickness less than the thickness of the tubular portion which is at the level of the connecting zone so that the tubular portion deforms at the absorption portion when the it is subjected to efforts, thus protecting the membrane from deformations.
- the absorption portion has a minimum thickness of less than 0.5 mm.
- the absorption portion extends along the longitudinal axis over a distance greater than 0.5 mm.
- the attachment portion and the absorption portion are derived from material of the tubular portion to be easy to manufacture.
- the senor comprises a conical skirt welded to the fixing portion, the attachment portion extends along the longitudinal axis of a thickness of less than 0.5 mm in order to weld the skirt and the portion fastening to the body thanks to a unique laser welding. .
- the senor comprises a conical skirt, said skirt being derived from material of the fastening portion to be easy to manufacture.
- the invention also relates to a vehicle comprising a cylinder head, comprising at least one cylinder, and at least one measuring sensor, as presented above, the pressure inside said cylinder, said sensor being mounted in said cylinder head.
- the invention also relates to a method of assembling a measuring sensor as presented above comprising a single step of welding the skirt and the fixing portion on the tubular body.
- a single laser weld advantageously allows easy and fast manufacture of the sensor while limiting the risk of deformation of the membrane by the heat generated during welding.
- FIG. 1 is a schematic view in longitudinal section of a pressure sensor according to the prior art
- FIG. 2 is a schematic view in longitudinal section of an embodiment of the pressure sensor according to the invention.
- FIG. 3 is a schematic longitudinal sectional view of a second embodiment of the sensor according to the invention.
- the sensor according to the invention is intended to be mounted on a cylinder head of a motor vehicle in order to measure the pressure of the gases contained in a cylinder of said cylinder head.
- the sensor is configured to be introduced into an orifice (not shown) of the cylinder head opening, on one side, into a cylinder and, on the other hand, outside the cylinder head.
- Such a sensor transforms in a known manner the mechanical stress generated by the pressure in the cylinder into an electrical signal representative of said pressure which is sent to an on-board computer of the vehicle in order to optimize various operating parameters of the vehicle such that, for example, example, its fuel consumption.
- FIG. 2 there is shown a first embodiment of a pressure sensor 10 according to the invention.
- the sensor 10 firstly comprises a tubular body 20 of elongated shape extending along a longitudinal axis Xi 0 between a gripping end (no _
- a measuring end 20A and a measuring end 20A, and comprising a substantially cylindrical inner surface 20B delimiting an inner cavity 20C.
- the gripping end is used for mounting and disassembling the sensor 10 in the bolt hole by screwing and unscrewing from outside the cylinder head.
- the body 10 has a thread (not shown) on a portion of its outer surface cooperating with a tapping of the orifice.
- the measuring end 20A is configured to receive an element 30 responsive to variations in gas pressure in the cylinder.
- This sensitive element 30 is mounted both at the measuring end 20A and in the internal cavity 20C of the tubular body 20.
- the measuring end 20A has a circular surface for welding the sensitive element 30 to the tubular body 20 extending in a plane perpendicular to the longitudinal axis X 10 and allowing in particular the blocking of the element sensitive in the tubular body 2 along the longitudinal axis Xi 0 .
- the sensitive element 30 comprises a piezoelectric module 30A, a transmission member 30B and a flange 30C.
- the flange 30C is arranged, on the one hand, to receive the piezoelectric module 30A and the transmission member 30B and, on the other hand, to receive a mechanical stress generated by the pressure in the cylinder.
- the transmission member 30B extends longitudinally along the longitudinal axis Xi 0 and is arranged to move along said longitudinal axis Xi 0 under the effect of a mechanical stress received by the flange 30C in order to transmit it to the piezoelectric module 30A.
- the piezoelectric module 30A is configured to convert a mechanical stress transmitted by the transmission member 30B into an electrical voltage representative of the value of the pressure prevailing in the cylinder.
- the operation of such a piezoelectric module 30A is known to those skilled in the art, it will not be presented in more detail.
- the flange 30C comprises a tubular portion 30C-1, a membrane 30C-2 extending in said tubular portion 30C-1 and a portion 30C-3 for fixing the flange 30C to the sensor body 2.
- the tubular portion 30C-1 extends longitudinally along the axis X 0 and defines a hollow interior space 30C-1 1 in which are housed the transmission member 30B and the piezoelectric module 30A.
- the tubular portion 30C-1 comprises a 30C-12 bonding zone of the 30C-2 membrane on the tubular portion 30C-1 in the space "
- the tubular portion 30C-1 has, at the connection zone 30C-12, a thickness of about 0.8 mm in order to stiffen the membrane 30C-2.
- the membrane 30C-2 comprises a circular portion 30C-21 extending transversely in the tubular portion 30C-1 so as to obstruct it and a connecting protrusion 30C-22 extending from the center of said circular portion 30C-21 along the longitudinal axis ⁇ ⁇ 0 to connect the membrane 30C-2 to the transmission member 30B.
- the circular portion 30C-21 has a small thickness, of the order of 0.3 mm, allowing its elastic deformation under the effect of the pressure in the cylinder.
- the membrane 30C-2 is derived from material of the tubular portion 30C-1. It has been presented a membrane 30C-2 material from the tubular portion 30C-1, but it goes without saying that the membrane 30C-2 could be a separate piece mounted in the interior space of the tubular portion 30C-1, for example by gluing, screwing, welding, etc. Similarly, the membrane may be of flattened shape, then extending radially to the longitudinal axis Xio, or of concave or convex shape.
- the fixing portion 30C-3 extends radially, with respect to the longitudinal axis X 10 , from the tubular portion 30C-1 and allows the attachment by welding of the flange 30C to the body 20 at a weld S 10 . More particularly, the fixing portion 30C-3 is adapted to come into contact with the fastening surface of the tubular body 2 in order to be welded to assemble the sensor 10.
- the fixing portion 30C-3 has a thickness, according to FIG. longitudinal axis X 10) less than 0.8 mm, preferably of the order of 0.4 mm.
- connection zone 30C-12 of the membrane 30C-2 and the fixing portion 30C-3 are separated by a distance along the longitudinal axis Xi 0, which is not zero, preferably greater than 1 , 5 mm.
- a separation distance advantageously makes it possible to protect the membrane 30C-2 from possible deformations of the fixing portion 30C-3 and in particular from the heat generated during the welding of the fixing portion 30C-3 on the tubular body 20.
- the tubular portion 30C-1 has, between the connection zone 30C-12 and the fixing portion 30C-3, an absorption portion 30C-4.
- This absorption portion 30C-4 has a reduced thickness relative to the thickness of the tubular portion 3C-1 which is located at the connecting zone 30C-12.
- the thickness at the absorption portion 30C-4 gradually decreases to a thickness of less than 0.5 mm.
- the thickness of the tubular portion 30C-1 is thus reduced along a length, along the longitudinal axis X 10 , of the order of 0.5 mm.
- Such absorption portion 30C-4 allows a deformation of the tubular portion 30C-1 when the fixing portion 30C-3 is subjected to efforts while preventing this deformation propagates to the membrane 30C-2.
- the sensor comprises a skirt 40.
- the skirt 40 has a zone of attachment to the flange 30C and a conical portion 41 enabling the sensor 1 to be mounted in force. the hole of the breech.
- the skirt 40 is mounted on the flange 30C at the fixing portion 30C-3, on the opposite side to the tubular body 2.
- the fixing portion 30C-3 is connected, on the one hand, to the tubular body 2 and on the other hand, to the skirt 40.
- the skirt 40 is preferably welded to the flange 30C.
- the skirt 40 defines a cylindrical opening 42 at its center.
- skirt 30C-5 may be derived from the material of the fastening portion 30C-3 while presenting the same shapes and dimensions as in the first embodiment of the sensor 10 presented above.
- the sensitive element 30 When mounting the sensor 10 according to the invention, the sensitive element 30 is first assembled. To do this, the piezoelectric module 30A and the transmission member 30B are mounted in the inner space 30C-11 of the flange 30C, the transmission member 30B being in contact, on the one hand, with the membrane 30C. 2 at the connecting protrusion 30C-22, and secondly with the piezoelectric module 30A.
- the sensitive element 30 is then mounted coaxially in the tubular body 2 so that the fixing portion 30C-3 is in contact with the measuring end 20A of the body 2.
- the fixing portion 30C-3 and the body 2 are welded together by laser welding at a weld S 10 .
- the connection zone 30C-12 of the membrane 30C-2 being separated from the fixing portion 30C-3, the heat generated by the weld S 10 does not deform said membrane 30C-2.
- the sensor 10 comprises a reported skirt 40
- the skirt 40 is welded to the fixing portion 30C-3 on the opposite side to the body 2.
- the sensor 10 thus assembled is then introduced into the hole of the cylinder head by the conical end 30C-5, 41.
- the tubular body 2 is screwed into said orifice to force the sensor 10 into the hole.
- the forces due to the force fitting of the conical end 30C-5, 41 by screwing the gripping end of the body 2 are advantageously absorbed by the deformation of the absorption portion 30C-4 of the tubular portion 30C-1 30C flange.
- the membrane 30C-2 is protected and is not deformed during this mounting operation.
- the membrane 30C-2 deforms under the effect of the pressure, thus generating a mechanical stress transmitted by the transmission member 30B to the piezoelectric module 30A which converts it into a voltage representing the pressure within the cylinder.
- connection zone 30C-12, of the fixing portion 30C-3, of the absorption portion as shown in the figures so as to illustrate an exemplary embodiment of the invention, can not be interpreted as limiting.
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- 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
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201680038296.3A CN107810401B (zh) | 2015-04-29 | 2016-04-26 | 用于测量机动车辆的汽缸中的主导压力的传感器 |
US15/568,982 US10551269B2 (en) | 2015-04-29 | 2016-04-26 | Sensor for measuring the pressure prevailing in a motor vehicle cylinder head |
KR1020177034334A KR102454521B1 (ko) | 2015-04-29 | 2016-04-26 | 자동차의 실린더 헤드에 작용하는 압력을 측정하는 센서 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1553900A FR3035713B1 (fr) | 2015-04-29 | 2015-04-29 | Capteur de mesure de la pression regnant dans un cylindre d'un vehicule automobile |
FR1553900 | 2015-04-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2016173703A1 true WO2016173703A1 (fr) | 2016-11-03 |
Family
ID=53366208
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2016/000658 WO2016173703A1 (fr) | 2015-04-29 | 2016-04-26 | Capteur de mesure de la pression regnant dans un cylindre d'un vehicule automobile |
Country Status (5)
Country | Link |
---|---|
US (1) | US10551269B2 (fr) |
KR (1) | KR102454521B1 (fr) |
CN (1) | CN107810401B (fr) |
FR (1) | FR3035713B1 (fr) |
WO (1) | WO2016173703A1 (fr) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH537013A (de) * | 1972-05-08 | 1973-05-15 | Kistler Instrumente Ag | Druckmesswandler |
US20100294028A1 (en) * | 2009-05-25 | 2010-11-25 | Siegenthaler Petra | Device for detecting a combustion chamber pressure of an internal combustion engine |
FR2977669A1 (fr) * | 2011-07-08 | 2013-01-11 | Continental Automotive France | Dispositif de mesure de pression isole pour moteur a combustion interne |
DE102011087641A1 (de) * | 2011-12-02 | 2013-06-06 | Robert Bosch Gmbh | Druckmesseinrichtung mit Zusatzmembran |
DE102012202058A1 (de) * | 2012-02-10 | 2013-08-14 | Robert Bosch Gmbh | Membran für Brennraumdrucksensor |
DE102014102129A1 (de) * | 2013-05-03 | 2014-11-06 | Piezocryst Advanced Sensorics Gmbh | Vorrichtung zum Abziehen eines Thermoschutzelementes |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE169402T1 (de) * | 1993-10-13 | 1998-08-15 | Kk Holding Ag | Thermo-kompensierte druckaufnehmer- membranstruktur |
DE102011017667A1 (de) * | 2011-04-28 | 2012-10-31 | Robert Bosch Gmbh | Vorrichtung zur Erfassung eines Drucks, insbesondere eines Brennraumdrucks einer Brennkraftmaschine |
JP2013174211A (ja) * | 2012-02-27 | 2013-09-05 | Citizen Finetech Miyota Co Ltd | 燃焼圧検出装置、燃焼圧検出装置付き内燃機関 |
EP2730904A1 (fr) * | 2012-11-12 | 2014-05-14 | Sensata Technologies, Inc. | Fiche de mesure de la pression pour un moteur à combustion |
JP2017211349A (ja) * | 2016-05-27 | 2017-11-30 | 株式会社デンソー | 圧力センサ |
-
2015
- 2015-04-29 FR FR1553900A patent/FR3035713B1/fr active Active
-
2016
- 2016-04-26 US US15/568,982 patent/US10551269B2/en active Active
- 2016-04-26 WO PCT/EP2016/000658 patent/WO2016173703A1/fr active Application Filing
- 2016-04-26 CN CN201680038296.3A patent/CN107810401B/zh active Active
- 2016-04-26 KR KR1020177034334A patent/KR102454521B1/ko active IP Right Grant
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH537013A (de) * | 1972-05-08 | 1973-05-15 | Kistler Instrumente Ag | Druckmesswandler |
US20100294028A1 (en) * | 2009-05-25 | 2010-11-25 | Siegenthaler Petra | Device for detecting a combustion chamber pressure of an internal combustion engine |
FR2977669A1 (fr) * | 2011-07-08 | 2013-01-11 | Continental Automotive France | Dispositif de mesure de pression isole pour moteur a combustion interne |
DE102011087641A1 (de) * | 2011-12-02 | 2013-06-06 | Robert Bosch Gmbh | Druckmesseinrichtung mit Zusatzmembran |
DE102012202058A1 (de) * | 2012-02-10 | 2013-08-14 | Robert Bosch Gmbh | Membran für Brennraumdrucksensor |
DE102014102129A1 (de) * | 2013-05-03 | 2014-11-06 | Piezocryst Advanced Sensorics Gmbh | Vorrichtung zum Abziehen eines Thermoschutzelementes |
Also Published As
Publication number | Publication date |
---|---|
KR20170140380A (ko) | 2017-12-20 |
US20180128700A1 (en) | 2018-05-10 |
FR3035713B1 (fr) | 2018-08-17 |
US10551269B2 (en) | 2020-02-04 |
KR102454521B1 (ko) | 2022-10-13 |
CN107810401B (zh) | 2020-04-14 |
CN107810401A (zh) | 2018-03-16 |
FR3035713A1 (fr) | 2016-11-04 |
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