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 PDF

Info

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
Application number
US10/591,881
Inventor
Thomas Ludwig
Christoph Kern
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
Individual
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 Individual filed Critical Individual
Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KERN, CHRISTOPH, LUDWIG, THOMAS
Publication of US20070240661A1 publication Critical patent/US20070240661A1/en
Abandoned legal-status Critical Current

Links

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.

Abstract

A device for detecting the pressure in a combustion chamber of an engine is designed in such a way that the combustion-chamber pressure can be detected reliably and reproducibly. For this purpose, a glow element in a glow plug, exposed to the combustion-chamber pressure, is fixedly mounted in a housing of the glow plug via a fastening element. A sensor is fixedly mounted in the housing of the glow plug using this fastener located at a distance from the fastening element. This sensor detects the elastic deformation of the glow element caused by the combustion-chamber pressure. This device is preferably used in the automobile industry.

Description

    BACKGROUND INFORMATION
  • 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.
  • In this system, 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. 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.
  • Furthermore, 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.
    • SUMMARY OF THE INVENTION
  • 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.
  • For this purpose, the sensor 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.
  • Furthermore, 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.
  • According to an advantageous embodiment, there is an at least indirect frictional connection with pre-stress between the sensor and the glow element, which counteracts a hysteresis effect in detecting measured values.
  • It is furthermore advantageous that 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.
  • It is also advantageous if the at least one spacer is designed as an intermediate sleeve, the sensor is designed as a piezoelectric ring, and 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.
    • BRIEF DESCRIPTION OF THE DRAWING
  • FIG. 1 shows a simplified longitudinal section of the device for detecting the pressure in a combustion chamber of an engine.
    • DETAILED DESCRIPTION
  • 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.
  • Alternatively, 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. Alternatively, 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.
  • Contacting elements in the form of electric lines, used for supplying glow element 17 with power and for conducting the signals output by sensor 26, lead away from second end 24 of glow plug 11.
  • The above-described geometric arrangement of the important individual elements of the device for detecting the pressure in a combustion chamber of an engine is based on the following functions and effects.
  • 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. However, 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. 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.
  • To detect the pressure in combustion chamber 19, sensor 26 may also be operated in a pre-stressed manner to reduce hysteresis effects, for example. For this purpose, after glow element 17 is fastened to housing 13 via fastening element 22, 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.
  • The separation between 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.

Claims (16)

1-12. (canceled)
13. A device for detecting a cylinder pressure in an internal combustion engine, comprising:
a glow plug having a housing adapted to be mounted in a cylinder head of the engine, the glow plug having a first end and a second end;
a glow element situated at the first end of the glow plug, which, when the glow plug is installed, at least partially protrudes into a combustion chamber of the engine;
a fastening element attaching the glow element to the glow plug; and
a sensor situated between the fastening element and the second end of the glow plug.
14. The device according to claim 13, wherein the engine is a diesel engine.
15. The device according to claim 13, wherein the sensor is separated from the fastening element of the glow element and is secured in the glow plug at least indirectly via a fastener.
16. The device according to claim 15, wherein the sensor is connected to the glow element at least indirectly by friction lock.
17. The device according to claim 16, wherein the at least indirect friction lock between the sensor and the glow element is implemented with pre-stress.
18. The device according to claim 15, wherein the sensor is connected to the fastener at least indirectly by friction lock.
19. The device according to claim 18, wherein the at least indirect friction lock between the sensor and the fastener is implemented with pre-stress.
20. The device according to claim 13, wherein the sensor is separated from the glow element by at least one spacer.
21. The device according to claim 18, wherein the sensor is separated from the fastening element by at least one spacer element.
22. The device according to claim 20, wherein the spacer is an intermediate sleeve.
23. The device according to claim 21, wherein the spacer element is an intermediate sleeve.
24. The device according to claim 22, wherein the intermediate sleeve is made of graphite.
25. The device according to claim 23, wherein the intermediate sleeve is made of graphite.
26. The device according to claim 15, wherein the fastener is a sleeve caulked to the housing.
27. The device according to claim 13, wherein the sensor is a force sensor designed as a piezoelectric ring.
US10/591,881 2004-03-06 2005-01-13 Device for Detecting the Combustion-Chamber Pressure in an Internal Combustion Engine Abandoned US20070240661A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004011097.2 2004-03-06
DE102004011097A DE102004011097A1 (en) 2004-03-06 2004-03-06 Device for detecting the combustion chamber pressure in an internal combustion engine
PCT/EP2005/050125 WO2005085788A1 (en) 2004-03-06 2005-01-13 Device for detecting the combustion chamber pressure in an internal combustion engine

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 (en)
EP (1) EP1725848A1 (en)
JP (1) JP4546997B2 (en)
DE (1) DE102004011097A1 (en)
WO (1) WO2005085788A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005051817B4 (en) * 2005-10-28 2008-06-05 Beru Ag Pressure measuring glow device, in particular pressure measuring glow plug
DE102014223370A1 (en) 2014-11-17 2016-05-19 Robert Bosch Gmbh Assembly and method for joining components
DE102014223365A1 (en) 2014-11-17 2016-05-19 Robert Bosch Gmbh Lot metal powder, solder paste and method for joining components
DE102016206338A1 (en) 2016-04-15 2017-10-19 Robert Bosch Gmbh Method for joining components and corresponding assembly
DE102016206335A1 (en) 2016-04-15 2017-10-19 Robert Bosch Gmbh Lot metal powder, solder paste and method for joining components

Citations (5)

* Cited by examiner, † Cited by third party
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
US20070209624A1 (en) * 2004-03-16 2007-09-13 Thomas Ludwig 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
US7635826B2 (en) * 2006-06-14 2009-12-22 Ngk Spark Plug Co., Ltd. Glow plug having built-in sensor

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5917584U (en) * 1982-07-24 1984-02-02 トヨタ自動車株式会社 Spark plug with built-in pressure sensor
JPS62265470A (en) * 1986-05-13 1987-11-18 Nippon Denso Co Ltd Pre-heat control device for diesel engine
JPS6453014A (en) * 1987-08-24 1989-03-01 Mazda Motor Internal combustion engine with swirl chamber
JP3177819B2 (en) * 1995-09-05 2001-06-18 株式会社ユニシアジェックス In-cylinder pressure detector for internal combustion engines
JPH09159563A (en) * 1995-12-04 1997-06-20 Unisia Jecs Corp Pressure sensor
DE19844347A1 (en) * 1998-09-28 2000-03-30 Bosch Gmbh Robert Ceramic glow plug
JP4407044B2 (en) * 1999-12-24 2010-02-03 株式会社デンソー Combustion pressure sensor structure
DE10031893A1 (en) * 2000-06-30 2002-01-10 Bosch Gmbh Robert Glow plug with ion current sensor and method for operating such a glow plug

Patent Citations (6)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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
JP4546997B2 (en) 2010-09-22
EP1725848A1 (en) 2006-11-29
WO2005085788A1 (en) 2005-09-15
JP2007526420A (en) 2007-09-13
DE102004011097A1 (en) 2005-09-22

Similar Documents

Publication Publication Date Title
US7730771B2 (en) Device for detecting the combustion-chamber pressure in an internal combustion engine
US20070240661A1 (en) Device for Detecting the Combustion-Chamber Pressure in an Internal Combustion Engine
US7555932B2 (en) Combustion pressure sensor
JP5021760B2 (en) Pressure measuring device
US7337657B2 (en) Pressure glow plug for a diesel engine
US7032438B2 (en) Pressure gauge glow plug
JP4309917B2 (en) Sheath-type glow plug with elastically supported glow tube
KR101603128B1 (en) Device and Method for Determining Combustion Chamber Pressure
US20080223139A1 (en) Combustion pressure sensor
JP2008512660A (en) Device for detecting the pressure in a combustion chamber of an internal combustion engine
US20080264373A1 (en) Sheathed Element Glow Plug Having a Combustion Chamber Pressure Sensor
US20140216145A1 (en) Combustion chamber pressure gauge
US9683742B2 (en) Pressure sensor integrated glow plug
US8079253B2 (en) Combustion chamber pressure sensor
US8857249B2 (en) Dual diaphragm combustion pressure measuring device
JP2004124910A (en) Glow plug with combustion sensor, and fitting structure and fitting method of glow plug with combustion pressure sensor
JP4753389B2 (en) Sheath type glow plug with combustion chamber pressure sensor and seal element
US8875565B2 (en) Device incorporating a pressure sensor for measuring pressures within an internal combustion engine
US20110056925A1 (en) Pressure Measuring Glow Plug
US8356511B2 (en) Device including a pressure sensor for measuring pressures inside the combustion chamber of an engine
JP4922822B2 (en) Combustion pressure sensor
US20150135811A1 (en) Diaphragm for a pressure-measuring device
JP2007139397A (en) Glow plug with combustion pressure sensor
CN102033093B (en) Method for operating sensor
JP4207070B2 (en) Glow plug with combustion sensor

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