EP1116016A1 - Capteur de pression - Google Patents

Capteur de pression

Info

Publication number
EP1116016A1
EP1116016A1 EP00958139A EP00958139A EP1116016A1 EP 1116016 A1 EP1116016 A1 EP 1116016A1 EP 00958139 A EP00958139 A EP 00958139A EP 00958139 A EP00958139 A EP 00958139A EP 1116016 A1 EP1116016 A1 EP 1116016A1
Authority
EP
European Patent Office
Prior art keywords
sensor
channel
pressure sensor
section
pressure
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Withdrawn
Application number
EP00958139A
Other languages
German (de)
English (en)
Inventor
Thomas Lenzing
Uwe Konzelmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1116016A1 publication Critical patent/EP1116016A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G01L23/24—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 specially adapted for measuring pressure in inlet or exhaust ducts of internal-combustion engines
    • 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
    • G01L19/0627—Protection against aggressive medium in general

Definitions

  • the invention relates to a pressure sensor, in particular for an internal combustion engine, which has a sensor surface and a sensor channel connecting the sensor surface to the interior of a medium channel, according to the preamble of claim 1.
  • a pressure sensor which has a plastic housing with a nozzle-shaped pressure connection and which in the installed state on the intake pipe is essentially flush with an inner wall of the intake pipe of the internal combustion engine or protrudes only a few millimeters therefrom.
  • pressure sensors attached directly to the intake pipe, however, there is a risk of the pressure connection icing up, so that the pressure sensor may fail due to icing.
  • the sensor membrane With such icing of the sensor channel or the fluid contained therein or liquid components of the fluid, the sensor membrane can be subjected to such a high pressure that it breaks.
  • the pressure sensor according to the invention with the characterizing features of claim 1 has the advantage over the prior art that icing of the pressure sensor is reliably excluded.
  • the freezing fluid located directly in front of the sensor membrane e.g. a Bingha fluid or a Smartfluid from Bayer and possibly a highly viscous fluid
  • the size of the viscosity is partly strongly temperature-dependent. If instead of the Bingham 'see fluid such a highly viscous medium is used to protect against freezing, then in the vicinity of the freezing point of the flow medium in the suction pipe it has to increase its viscosity about a thousandfold compared to the usual temperatures. As a result, the highly silicic medium then behaves similarly to the Bingham 1 see medium, it becomes hard and blocks the sensor channel, so that a further increase in pressure up to the destruction of the membrane is prevented. (Highly viscous media are, for example, glucose syrup or Luviskol) Below the deformation threshold there is a Newtonian flow behavior, while the fluid used behaves like a solid above this deformation threshold.
  • the freezing of the medium or the liquid contained in the medium achieves a pressure in the free section of the sensor channel that corresponds to the deformation threshold value of the freezing protection fluid used, this solidifies and protects the sensor membrane against a further increase in pressure. In this way, it is avoided in the pressure sensor according to the invention that the freezing of the medium or the liquid contained in the medium in the pressure channel destroys the sensor membrane without significantly increasing the flow resistance in the medium channel or intake pipe of an internal combustion engine.
  • the selection of the anti-freeze fluid depends on the freezing temperature of the flow medium or the liquid contained in the flow medium.
  • a section of a medium channel 12 for example an intake pipe of an internal combustion engine, is shown cut up to its central axis 12 '.
  • the wall 13 of the medium channel hereinafter referred to only as the intake pipe 12, has a sensor channel 14 which extends essentially at right angles to the central axis 12 'and penetrates the wall 13 radially.
  • a pressure sensor 10 is attached to the outside of the intake pipe 12 on the wall 13 and engages with a sensor section 11 in the sensor channel 14.
  • the sensor section 11 is provided with a membrane 11 'in the region of its free end.
  • the sensor channel 14 essentially has two sections, namely a free section 16 facing the interior of the intake pipe 12 and a section 18 on the pressure sensor side.
  • the diameter of the pressure sensor section 18 of the sensor channel 14 is larger than the diameter of the free section 16, so that the cross section of the pressure sensor-side section 18 is larger than the cross section of the free section 16.
  • a cavern-like space facing the pressure sensor is formed in the interior of the wall 13 of the suction pipe 12 around the sensor channel 14, which is filled with a freeze-securing fluid 20.
  • the sensor section 11 with the membrane 11 ' is surrounded at its free end by the anti-freeze fluid 20.
  • the free section 16 of the sensor channel 14 is not filled with the freeze-securing fluid, so that the free section 16 forms a connection between the pressure sensor-side section 18 of the sensor channel 14 filled with the freeze-securing fluid 20 and the interior of the intake pipe 12.
  • the sensor channel is designed at least in sections as a capillary, the capillary forces and the capillary diameter being calculated according to the equations generally known to the person skilled in the art.
  • the sensor channel 14 with its section 18 containing the freezing fluid 20 can also be formed in an attachment of the pressure sensor 10, which can be inserted into an opening in the wall 13 of the intake pipe 12.
  • the static pressure of the flowing medium acts on the free surface facing the free section 16 of the sensor channel 14 of the anti-freeze fluid 20 and is transferred to the membrane 11 'via the anti-freeze fluid 20, the anti-freeze fluid behaving like a Newtonian fluid.
  • the pressure increase thereby caused has an effect on the anti-freeze fluid 20 such that the anti-freeze fluid 20 solidifies and increases it Pressure forces on the wall of the pressure sensor section 18 of the sensor channel 14 is supported and thus not transmitted to the membrane 11 '.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

L'invention concerne un capteur de pression pour un moteur à combustion interne comportant une tubulure d'aspiration. Ce capteur de pression présente une surface (11') et un canal (14) reliant ladite surface (11') et l'intérieur de la tubulure d'aspiration (12). Le canal (14) présente une partie (18) remplie d'un fluide antigel (20).
EP00958139A 1999-07-24 2000-07-15 Capteur de pression Withdrawn EP1116016A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19934832 1999-07-24
DE19934832A DE19934832A1 (de) 1999-07-24 1999-07-24 Drucksensor
PCT/DE2000/002318 WO2001007884A1 (fr) 1999-07-24 2000-07-15 Capteur de pression

Publications (1)

Publication Number Publication Date
EP1116016A1 true EP1116016A1 (fr) 2001-07-18

Family

ID=7915963

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00958139A Withdrawn EP1116016A1 (fr) 1999-07-24 2000-07-15 Capteur de pression

Country Status (5)

Country Link
EP (1) EP1116016A1 (fr)
JP (1) JP2003505689A (fr)
KR (1) KR20010075075A (fr)
DE (1) DE19934832A1 (fr)
WO (1) WO2001007884A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100542997B1 (ko) 2003-08-07 2006-01-20 삼성에스디아이 주식회사 평판표시장치 및 그의 제조방법
DE10349143B4 (de) * 2003-10-17 2006-05-24 Daimlerchrysler Ag Dosiereinheit
JP4792427B2 (ja) * 2007-06-15 2011-10-12 トヨタ自動車株式会社 配管防水接続構造
US20090017337A1 (en) * 2007-07-10 2009-01-15 Dirk Wexel Freeze tolerant pressure sensor
DE102008026611B4 (de) * 2008-06-03 2013-01-24 Continental Automotive Gmbh Drucksensoranordnung
KR200457853Y1 (ko) * 2010-01-23 2012-01-10 김외출 과실수용 가지유인구
US8347737B2 (en) * 2011-01-10 2013-01-08 GM Global Technology Operations LLC Pressure sensor for use in fuel cell systems
CN102998047A (zh) * 2011-09-19 2013-03-27 洪河 一种表盘刻度带萤光指示的径向波纹管隔膜防冻压力表
DE102017217684A1 (de) * 2017-10-05 2019-04-11 Bayerische Motoren Werke Aktiengesellschaft Ansaugtrakt für eine Verbrennungskraftmaschine eines Kraftfahrzeugs
CN111707407A (zh) * 2020-05-28 2020-09-25 延长油田股份有限公司定边采油厂 一种压力表防喷、防冻保护装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61246642A (ja) * 1985-04-24 1986-11-01 Nippon Denso Co Ltd 圧力センサ
DE19517676B4 (de) * 1995-05-13 2008-01-31 Robert Bosch Gmbh Drucksensor für eine Brennkraftmaschine mit einem Ansaugrohr
US5792958A (en) * 1997-01-21 1998-08-11 Honeywell Inc. Pressure sensor with a compressible insert to prevent damage from freezing

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0107884A1 *

Also Published As

Publication number Publication date
DE19934832A1 (de) 2001-01-25
KR20010075075A (ko) 2001-08-09
JP2003505689A (ja) 2003-02-12
WO2001007884A1 (fr) 2001-02-01

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