US20070240661A1 - Device for Detecting the Combustion-Chamber Pressure in an Internal Combustion Engine - Google Patents
Device for Detecting the Combustion-Chamber Pressure in an Internal Combustion Engine Download PDFInfo
- Publication number
- US20070240661A1 US20070240661A1 US10/591,881 US59188105A US2007240661A1 US 20070240661 A1 US20070240661 A1 US 20070240661A1 US 59188105 A US59188105 A US 59188105A US 2007240661 A1 US2007240661 A1 US 2007240661A1
- Authority
- US
- United States
- Prior art keywords
- sensor
- glow
- glow plug
- engine
- 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.)
- Abandoned
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 19
- 125000006850 spacer group Chemical group 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 230000005489 elastic deformation Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
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
- G01L23/22—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
Definitions
- a device for detecting a combustion-chamber pressure in a diesel engine having a pressure sensor and a heating section of a glow plug, is described in German Patent No. DE 196 80 912.
- This heating section faces an internal space of a cylinder of the diesel engine and may be exposed to the combustion-chamber pressure.
- the heating section is secured within a housing of the glow plug by a fastening element.
- the pressure sensor is situated between this fastening element and the heating section.
- the glow plug and the pressure sensor are supported by the same fastening element against the glow plug housing in such a way that the pressure sensor is affected by at least approximately the entire force acting upon the glow plug.
- the pressure sensor In a disadvantageous manner, for certain sensor materials this results in the pressure sensor being also operated in its non-linear range, which results in a non-reproducible measuring signal and unreliable pressure detection in the combustion chamber of the engine.
- the above-described arrangement of the pressure sensor being situated in the proximity of the internal space of the cylinder and being directly coupled to the glow plug during operation of the diesel engine is associated with a substantial heat load on the pressure sensor, thus jeopardizing its operational reliability. This may result in malfunction of the device for detecting the pressure in the combustion chamber of the engine and thus also in unreliable detection of the pressure in the combustion chamber of the engine, in particular when the signal output of the pressure sensor becomes unsteady due to fluctuations between high and low operating temperatures.
- the device according to the present invention has the advantage over the related art that the above-mentioned shortcomings are avoided to a satisfactory degree.
- the senor is situated between the fastening element of the glow element of the glow plug and a second end of the glow plug.
- This offers the possibility of uncoupling the sensor from the total force acting upon the glow element and of operating it in its linear and low-hysteresis range.
- the separation between the attachment of the glow element and the attachment of the sensor in the glow plug allows the stressed area of the sensor to be delimited in a controlled manner in such a way that the optimum area of the sensor with respect to signal generation may be used for reliable and reproducible detection of the pressure in the combustion chamber of the engine.
- the distance between the sensor and the glow element, as well as the thermal connection of the glow element via its attachment to the housing causes a reduction in the heat load on the sensor, in such a way that its operational reliability is less affected, making the detection of the pressure in the combustion chamber of the engine more reliable.
- the sensor is separated from the glow element and the fastening element by at least one spacer. This design and stiffness may allow the maximum force acting upon the sensor to be adjusted.
- the at least one spacer is designed as an intermediate sleeve
- the sensor is designed as a piezoelectric ring
- the fastening element is designed as a sleeve. This allows heating and signal lines for the sheathed element glow plug and the sensor to be run through in a simplified manner.
- FIG. 1 shows a simplified longitudinal section of the device for detecting the pressure in a combustion chamber of an engine.
- a device for detecting the pressure in a combustion chamber of an engine according to FIG. 1 has a glow plug 11 , which is installed in a cylinder head 14 of the engine depicted only schematically, in particular of a diesel engine, via an external thread 12 of a tubular metal housing 13 .
- a first end 16 of glow plug 11 has a glow element 17 , which partially protrudes from housing 13 and a free end 18 of the glow plug protrudes into an internal space 19 of the engine, forming a combustion chamber.
- Glow element 17 is secured in glow plug 11 by a fastening element 22 .
- This fastening element 22 is designed as a support tube which surrounds and fastens glow element 17 over its circumference in an end area 23 of its other end. Fastening element 22 , in turn, is pressed into housing 13 .
- fastening element 22 may also be implemented as a graphite sleeve or in the form of a permanent bond, for example, a weld.
- Sensor 26 is situated between fastening element 22 and thus between end area 23 of glow element 17 and second end 24 of glow plug 11 .
- Sensor 26 is separated from glow element 17 by a spacer 27 in this embodiment.
- sensor 26 may also directly rest against glow element 17 .
- Sensor 26 is also supported by a fastener 29 for sensor 24 fixedly situated in housing 13 with spacer element 28 in between, thus establishing the position of sensor 26 in housing 13 .
- Fastener 29 is designed, for example, as a sleeve caulked in housing 13 and may also alternatively rest directly against sensor 26 .
- Spacer 27 and spacer element 28 are designed as an intermediate sleeve 31 , which is preferably made of ceramic or steel.
- glow element 17 During operation of the engine, combustion gases are generated in combustion chamber 19 and exert a pressure force on glow element 17 due to their limited expansion in combustion chamber 19 .
- the axial components of the pressure force, directed in the longitudinal direction of glow plug 11 tend to displace glow element 17 toward second end 24 of glow plug 11 .
- glow element 17 is largely prevented from being displaced by fastening element 22 , which absorbs most of these pressure forces and transmits them to housing 13 and to cylinder head 14 .
- the pressure force on glow element 17 results, however, in elastic deformation of glow element 17 , which is then absorbed by sensor 26 , which is implemented, for example, as a pressure or distance sensor designed as a piezoelectric ring.
- sensor 26 which is implemented, for example, as a pressure or distance sensor designed as a piezoelectric ring.
- the signal output by sensor 26 may be correlated with the pressure in combustion chamber 19 via characteristic curves. Ideally, the signal output by sensor 26 is a quantity proportional to the pressure in combustion chamber 19 .
- sensor 26 may also be operated in a pre-stressed manner to reduce hysteresis effects, for example.
- a predefined force is applied to sensor 26 , to press it against glow element 17 even when the engine is stopped, alternatively even indirectly via intermediate spacer 27 .
- This pre-stress is maintained by fastener 29 fixedly mounted in housing 13 or a spacer element 28 fastened to housing 13 .
- the maximum force on sensor 26 may then be adjusted via the stiffness of housing 13 , fastening element 22 , or fastener 29 .
- fastening element 22 for glow element 17 and fastener 29 for sensor 26 allows the optimum area of sensor 26 with respect to signal generation to be used for reliable and reproducible detection of the pressure in the combustion chamber of the engine.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004011097A DE102004011097A1 (de) | 2004-03-06 | 2004-03-06 | Vorrichtung zur Erfassung des Brennraumdrucks bei einer Brennkraftmaschine |
DE102004011097.2 | 2004-03-06 | ||
PCT/EP2005/050125 WO2005085788A1 (de) | 2004-03-06 | 2005-01-13 | Vorrichtung zur erfassung des brennraumdrucks bei einer brennkraftmaschine |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070240661A1 true US20070240661A1 (en) | 2007-10-18 |
Family
ID=34877507
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/591,881 Abandoned US20070240661A1 (en) | 2004-03-06 | 2005-01-13 | Device for Detecting the Combustion-Chamber Pressure in an Internal Combustion Engine |
Country Status (5)
Country | Link |
---|---|
US (1) | US20070240661A1 (de) |
EP (1) | EP1725848A1 (de) |
JP (1) | JP4546997B2 (de) |
DE (1) | DE102004011097A1 (de) |
WO (1) | WO2005085788A1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090165739A1 (en) * | 2005-12-23 | 2009-07-02 | Christoph Kern | Sheathed-element glow plug |
US20110197666A1 (en) * | 2008-04-23 | 2011-08-18 | Yue Cheng | Pressure Measuring Glow Plug |
US20110220073A1 (en) * | 2010-03-11 | 2011-09-15 | Borgwarner Beru Systems Gmbh | Method for controlling a glow plug |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005051817B4 (de) * | 2005-10-28 | 2008-06-05 | Beru Ag | Druckmessglüheinrichtung, insbesondere Druckmessglühkerze |
DE102014223370A1 (de) | 2014-11-17 | 2016-05-19 | Robert Bosch Gmbh | Baugruppe und Verfahren zum Fügen von Bauteilen |
DE102014223365A1 (de) | 2014-11-17 | 2016-05-19 | Robert Bosch Gmbh | Lotmetallpulver, Lotpaste und Verfahren zum Fügen von Bauteilen |
DE102016206338A1 (de) | 2016-04-15 | 2017-10-19 | Robert Bosch Gmbh | Verfahren zum Fügen von Bauteilen und entsprechende Baugruppe |
DE102016206335A1 (de) | 2016-04-15 | 2017-10-19 | Robert Bosch Gmbh | Lotmetallpulver, Lotpaste und Verfahren zum Fügen von Bauteilen |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060032472A1 (en) * | 2004-08-05 | 2006-02-16 | Ngk Spark Plug Co., Ltd. | Glow plug with combustion pressure detecting function |
US20070095811A1 (en) * | 2005-10-28 | 2007-05-03 | Beru Ag | Pressure pickup heating bar, in particular for a pressure pickup glow plug |
US20070209625A1 (en) * | 2004-04-27 | 2007-09-13 | Michel Boucard | Glow Plug Head And Corresponding Piezo-Electric Pressure Sensor |
US20070209624A1 (en) * | 2004-03-16 | 2007-09-13 | Thomas Ludwig | Sheathed-Element Glow Plug Having An Elastically Mounted Glow Element |
US7635826B2 (en) * | 2006-06-14 | 2009-12-22 | Ngk Spark Plug Co., Ltd. | Glow plug having built-in sensor |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5917584U (ja) * | 1982-07-24 | 1984-02-02 | トヨタ自動車株式会社 | 圧力センサ内蔵点火プラグ |
JPS62265470A (ja) * | 1986-05-13 | 1987-11-18 | Nippon Denso Co Ltd | デイ−ゼルエンジンの予熱制御装置 |
JPS6453014A (en) * | 1987-08-24 | 1989-03-01 | Mazda Motor | Internal combustion engine with swirl chamber |
JP3177819B2 (ja) * | 1995-09-05 | 2001-06-18 | 株式会社ユニシアジェックス | 内燃機関の筒内圧力検出装置 |
JPH09159563A (ja) * | 1995-12-04 | 1997-06-20 | Unisia Jecs Corp | 圧力センサ |
DE19844347A1 (de) * | 1998-09-28 | 2000-03-30 | Bosch Gmbh Robert | Keramische Glühstiftkerze |
JP4407044B2 (ja) * | 1999-12-24 | 2010-02-03 | 株式会社デンソー | 燃焼圧センサ構造体 |
DE10031893A1 (de) * | 2000-06-30 | 2002-01-10 | Bosch Gmbh Robert | Glühstiftkerze mit Ionenstromsensor sowie Verfahren zum Betreiben einer derartigen Glühstiftkerze |
-
2004
- 2004-03-06 DE DE102004011097A patent/DE102004011097A1/de not_active Withdrawn
-
2005
- 2005-01-13 EP EP05701508A patent/EP1725848A1/de not_active Withdrawn
- 2005-01-13 WO PCT/EP2005/050125 patent/WO2005085788A1/de active Application Filing
- 2005-01-13 JP JP2007501255A patent/JP4546997B2/ja not_active Expired - Fee Related
- 2005-01-13 US US10/591,881 patent/US20070240661A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070209624A1 (en) * | 2004-03-16 | 2007-09-13 | Thomas Ludwig | Sheathed-Element Glow Plug Having An Elastically Mounted Glow Element |
US7431003B2 (en) * | 2004-03-16 | 2008-10-07 | Robert Bosch Gmbh | Sheathed-element glow plug having an elastically mounted glow element |
US20070209625A1 (en) * | 2004-04-27 | 2007-09-13 | Michel Boucard | Glow Plug Head And Corresponding Piezo-Electric Pressure Sensor |
US20060032472A1 (en) * | 2004-08-05 | 2006-02-16 | Ngk Spark Plug Co., Ltd. | Glow plug with combustion pressure detecting function |
US20070095811A1 (en) * | 2005-10-28 | 2007-05-03 | Beru Ag | Pressure pickup heating bar, in particular for a pressure pickup glow plug |
US7635826B2 (en) * | 2006-06-14 | 2009-12-22 | Ngk Spark Plug Co., Ltd. | Glow plug having built-in sensor |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090165739A1 (en) * | 2005-12-23 | 2009-07-02 | Christoph Kern | Sheathed-element glow plug |
US7712444B2 (en) * | 2005-12-23 | 2010-05-11 | Robert Bosch Gmbh | Sheathed-element glow plug |
US20110197666A1 (en) * | 2008-04-23 | 2011-08-18 | Yue Cheng | Pressure Measuring Glow Plug |
US20110220073A1 (en) * | 2010-03-11 | 2011-09-15 | Borgwarner Beru Systems Gmbh | Method for controlling a glow plug |
US8656898B2 (en) * | 2010-03-11 | 2014-02-25 | Borgwarner Beru Systems Gmbh | Method for controlling a glow plug |
Also Published As
Publication number | Publication date |
---|---|
DE102004011097A1 (de) | 2005-09-22 |
EP1725848A1 (de) | 2006-11-29 |
JP4546997B2 (ja) | 2010-09-22 |
WO2005085788A1 (de) | 2005-09-15 |
JP2007526420A (ja) | 2007-09-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ROBERT BOSCH GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LUDWIG, THOMAS;KERN, CHRISTOPH;REEL/FRAME:019534/0348;SIGNING DATES FROM 20061014 TO 20061024 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |