US20130206092A1 - Pressure measuring glow plug - Google Patents

Pressure measuring glow plug Download PDF

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Publication number
US20130206092A1
US20130206092A1 US13/765,421 US201313765421A US2013206092A1 US 20130206092 A1 US20130206092 A1 US 20130206092A1 US 201313765421 A US201313765421 A US 201313765421A US 2013206092 A1 US2013206092 A1 US 2013206092A1
Authority
US
United States
Prior art keywords
sensor
glow
ground contact
glow plug
contact
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
US13/765,421
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English (en)
Inventor
Christian Pottiez
Joern Bohnenkamp
Dirk Wüstenhagen
Georg Rixecker
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.)
BorgWarner Ludwigsburg GmbH
Original Assignee
BorgWarner Beru Systems 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 BorgWarner Beru Systems GmbH filed Critical BorgWarner Beru Systems GmbH
Assigned to BORGWARNER BERU SYSTEMS GMBH reassignment BORGWARNER BERU SYSTEMS GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BOHNENKAMP, JOERN, POTTIEZ, CHRISTIAN, RIXECKER, GEORG, WUESTENHAGEN, DIRK
Publication of US20130206092A1 publication Critical patent/US20130206092A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
    • F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/22—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines
    • F23Q2007/002—Glowing plugs for internal-combustion engines with sensing means

Definitions

  • This disclosure relates to a glow plug and, more particularly, a pressure measuring glow plug.
  • Glow plugs comprising installed sensors are used to measure combustion chamber pressure. High temperatures, abrupt temperature changes and a strong mechanical load caused by vibrations and the like characterize the usage conditions of pressure sensors in glow plugs and make it difficult to precisely measure combustion chamber pressure.
  • the problem addressed by this disclosure is that of demonstrating a way to measure combustion chamber pressure with greater precision.
  • a ground contact of the sensor is formed as a tube or sleeve and encloses a section of the inner pole circumferentially.
  • the signal contact of the sensor extends between a section of the ground contact and the housing tube. Measuring accuracy is markedly improved as a result.
  • pulse-width modulated voltage signals that are fed to the glow element via the inner pole can induce interference signals, which can impair the measuring accuracy of a pressure measurement. That is, the rapid on and off switching of the power supply unit can cause charges to be induced into a parasitic capacitor, which is formed by the inner pole and the sensor or the signal contact thereof. In a glow plug according to this disclosure, this can be prevented by a shield formed by the ground contact, in that the ground contact encloses the inner pole. In a glow plug according to this disclosure, the inner pole therefore forms a parasitic capacitor with the ground contact. Charges of this capacitor have no influence or only negligible influence on the sensor signal since they can flow to ground. Since the signal contact of the sensor is shielded from the inner pole by the ground contact, the measuring accuracy is improved.
  • the ground contact of the sensor can electrically contact the tube housing.
  • the ground contact of the sensor is electrically insulated from the tube housing.
  • the inner pole can be connected to a potential connection of the glow element, and the tube housing can be connected to a ground connection of the glow element.
  • the glow element and the sensor can therefore be at ground potentials that can differ from one another at least temporarily.
  • An end section of the ground contact that contacts the sensor may be covered on the side thereof facing away from the sensor by an insulator, for example an insulator ring or an insulator disk. In this manner the ground contact can be electrically insulated from the tube housing in a technically simple manner.
  • the signal contact of the sensor can surround the ground contact of the sensor, for example in that the signal contact is in the form of a tube or sleeve.
  • the signal contact can also be formed by one or more wires or strips disposed between the wall of the housing tube and the ground contact.
  • the ground contact of the sensor protrudes at both ends thereof from the signal contact of the sensor. In this manner it is possible to shield the signal contact along the entire length thereof from the inner pole. The coupling-in of interference signals can thereby be reliably prevented.
  • the ground contact and/or the signal contact comprises an overhanging end section, i.e., a radially protruding end section, against which the sensor bears.
  • Both the ground contact and the signal contact can have an overhanging end section.
  • An overhanging end section can be provided, for example, as a flange at a tubular signal contact or ground contact.
  • An overhanging end section can be used, advantageously, to establish reliable electric contact between the sensor and the end section.
  • the sensor can be clamped between the overhanging end sections of the ground contact and the signal contact, thereby ensuring that reliable electric contact is maintained even in the presence of vibrations that occur during engine operation.
  • an insulation layer is located between the ground contact and the signal contact.
  • the insulation layer can be in the form of a separate tube, for example. It is also possible for the ground contact to be wrapped with an insulator, for example a plastic film.
  • An insulation layer may also be located between the inner pole and the ground contact. This insulation layer can also be in the form of a tube, an inner coating of the ground contact or a coating of the inner pole.
  • the inner pole, the ground contact of the sensor and the signal contact of the sensor protrude from the tube housing.
  • the glow plug can be connected easily, namely by way of the inner pole to a voltage source and by way of the ground contact of the sensor and the signal contact of the sensor to a control device, which evaluates measured data on pressure delivered by the sensor.
  • FIG. 1 shows an embodiment of a glow plug in a partially exposed view
  • FIG. 2 shows a detailed view of FIG. 1 ;
  • FIG. 3 shows a schematic block diagram of the glow plug during operation.
  • FIG. 1 shows a glow plug comprising a housing tube 1 , from which a glow element 2 protrudes.
  • the glow element 2 is fastened to the housing tube 1 by way of a diaphragm 3 .
  • the diaphragm 3 When the glow element 2 moves in the longitudinal direction thereof, the diaphragm 3 generates a reset force.
  • the strength of a combustion chamber pressure acting on the glow element 2 determines the extent to which the glow element 2 is pressed into the housing tube 1 .
  • the glow element 2 can press directly onto a sensor 4 in order to measure pressure.
  • a tube 5 is mounted on the glow element 2 , by way of which the glow element 2 presses onto the sensor 4 .
  • the inner pole 6 of the glow plug extends in the tube 5 .
  • the inner pole 6 is connected to the glow element 2 and is used to apply supply voltage to the glow element 2 .
  • the sensor 4 is a piezoelectric sensor. Other sensors could also be used in order to detect the position of the glow element 2 and, therefore, to measure the combustion chamber pressure.
  • the sensor 4 is in the form of a ring, through which the inner pole 6 of the glow plug extends.
  • the sensor 4 is contacted by a ground contact 7 on a side facing the glow element 2 .
  • a side of the sensor 4 facing away from the glow element 2 is contacted by a signal contact 8 .
  • Both the signal contact 8 and the ground contact 7 are in the form of a tube or sleeve and are disposed around the inner pole 6 .
  • the sensor 4 is located between an overhanging end section of the ground contact 7 and an overhanging end section of the signal contact 8 .
  • the inner pole 6 protrudes by way of the two ends thereof from the ground contact 7 and from the signal contact 8 .
  • a tubular section of the ground contact 7 therefore surrounds a section of the inner pole 6 that extends in the tube 5 to the glow element 2 .
  • the tubular section of the ground contact 7 is enclosed by a tubular section of the signal contact 8 .
  • the signal contact 8 therefore surrounds, in the tube housing 2 , a section of the ground contact 7 and a section of the inner pole 6 .
  • the ground contact 8 is longer than the signal contact 7 .
  • the ground contact 8 therefore protrudes from the signal contact 7 at both ends.
  • the ground contact 8 , the signal contact 7 and the inner pole 6 protrude from the housing tube 1 .
  • An insulation layer is located between the inner pole 6 and the ground contact 8 .
  • An insulation layer is also located between the ground contact 8 and the signal contact 7 , for example an insulator tube 9 , which is preferably made of plastic.
  • the inner pole 6 is connected to a potential connection of the glow element 2
  • the tube housing 1 is connected to a ground connection of the glow element 2 .
  • this ground connection can be established by way of the diaphragm 3 .
  • the ground contact of the sensor 4 can be electrically insulated from the tube housing 1 .
  • the overhanging end section of the ground contact 7 is located between the sensor 4 and an insulator disk 10 .
  • the insulator disk 10 is located between the sensor 4 and the tube 5 , for example on an end surface of the tube 5 , and thereby electrically insulates the ground contact 7 .
  • the overhanging end section of the signal contact 8 is located between the sensor 4 and an insulator ring 11 .
  • the housing tube 1 is closed by a cap 12 , which is used as an abutment for the pressure exerted by the glow element 1 .
  • the insulator ring 11 may bear against the cap 12 , which is the case in embodiment shown.
  • FIG. 3 schematically shows a block diagram of the above-described glow plug together with a connected voltage source 13 and an electronics unit.
  • the electronics unit comprises an active low-pass filter, which is formed by an operational amplifier, the capacitor C f and the resistor R f .
  • the electronics unit can be disposed in the tube housing 1 of the glow plug, or outside thereof, can be used as a system component of signal conditioning or signal amplification that is separate from the glow plug.
  • the electronics unit can also be integrated in the glow plug control device, for example.
  • the design of the electronics unit can deviate from the example shown in FIG. 3 .
  • the electronics unit contains amplifiers and/or filters.
  • the sensor 4 of the glow plug is contacted by the ground contact 7 on one side and by the signal contact 8 on the other side.
  • the ground contact 7 and the signal contact 8 lead to the inputs of the operational amplifier shown in FIG. 3 .
  • the ground contact 7 and the signal contact 8 may also be routed to any other filter or evaluation circuit.
  • the resistor R glow is the glow element 2 , which is connected to the voltage source 13 via the inner pole 6 .
  • the voltage source 13 supplies the glow element 2 with pulse-width modulated voltage signals.
  • the inner pole 6 forms parasitic capacitance indicated as C para in FIG. 3 .
  • the ground contact 7 is connected to the ground of a control device, which is indicated in FIG. 3 as GND ECU .
  • the resistor R glow of the glow element 2 is connected to the ground of the engine GND Engine , which does not necessarily have to be the same as the ground of the control device, but rather can deviate therefrom temporarily or continuously.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measuring Fluid Pressure (AREA)
US13/765,421 2012-02-15 2013-02-12 Pressure measuring glow plug Abandoned US20130206092A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012101215A DE102012101215A1 (de) 2012-02-15 2012-02-15 Druckmessglühkerze
DE102012101215.6 2012-02-15

Publications (1)

Publication Number Publication Date
US20130206092A1 true US20130206092A1 (en) 2013-08-15

Family

ID=48915042

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/765,421 Abandoned US20130206092A1 (en) 2012-02-15 2013-02-12 Pressure measuring glow plug

Country Status (4)

Country Link
US (1) US20130206092A1 (enrdf_load_stackoverflow)
KR (1) KR20130094233A (enrdf_load_stackoverflow)
DE (1) DE102012101215A1 (enrdf_load_stackoverflow)
IN (1) IN2013CH00563A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140109661A1 (en) * 2012-10-24 2014-04-24 Borgwarner Beru Systems Gmbh Pressure gauge
US20140216145A1 (en) * 2013-02-06 2014-08-07 Borgwarner Beru Systems Gmbh Combustion chamber pressure gauge
US20160177909A1 (en) * 2014-12-22 2016-06-23 Ngk Spark Plug Co., Ltd. Glow plug with pressure sensor
CN111454612A (zh) * 2019-01-22 2020-07-28 株式会社理光 硬化型透明墨水组合物，墨水套件，收容容器，印刷方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017100598B4 (de) 2017-01-13 2018-07-26 Borgwarner Ludwigsburg Gmbh Verfahren zum Kalibrieren einer Druckmessglühkerze

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5329809A (en) * 1993-04-22 1994-07-19 General Motors Corporation Non-intrusive cylinder pressure sensor
US6923042B2 (en) * 2002-09-19 2005-08-02 Denso Corporation Ignition apparatus for internal combustion engine
US6979801B2 (en) * 2003-03-17 2005-12-27 Ngk Spark Plug Co., Ltd. Glow plug with built-in combustion pressure sensor and manufacturing method thereof
US7185621B2 (en) * 2004-08-05 2007-03-06 Ngk Spark Plug Co., Ltd. Glow plug with combustion pressure detecting function
US7444973B2 (en) * 2004-04-27 2008-11-04 Siemens Vdo Automotive Device for acting upon a pressure sensor mounted on a flow plug
US20100079155A1 (en) * 2008-09-30 2010-04-01 Ngk Spark Plug Co., Ltd. Pressure detection apparatus
US20100300186A1 (en) * 2006-10-13 2010-12-02 Christoph Kern Pressure-Measuring Device
US7905209B2 (en) * 2007-08-30 2011-03-15 Denso Corporation Glow plug with combustion pressure sensor
US8217309B2 (en) * 2008-12-15 2012-07-10 Federal-Mogul Italy Srl. Glow plug with pressure sensing canister
US20130042831A1 (en) * 2011-08-19 2013-02-21 Ngk Spark Plug Co., Ltd. Glow plug fitted with combustion pressure detection sensor
US8893545B2 (en) * 2011-02-25 2014-11-25 Ngk Spark Plug Co., Ltd. Glow plug with combustion pressure sensor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006041124B4 (de) * 2006-09-01 2008-06-26 Beru Ag Glühkerze mit eingebautem Drucksensor
DE102007047710A1 (de) * 2007-10-05 2009-04-09 Robert Bosch Gmbh Druckmessvorrichtung

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5329809A (en) * 1993-04-22 1994-07-19 General Motors Corporation Non-intrusive cylinder pressure sensor
US6923042B2 (en) * 2002-09-19 2005-08-02 Denso Corporation Ignition apparatus for internal combustion engine
US6979801B2 (en) * 2003-03-17 2005-12-27 Ngk Spark Plug Co., Ltd. Glow plug with built-in combustion pressure sensor and manufacturing method thereof
US7444973B2 (en) * 2004-04-27 2008-11-04 Siemens Vdo Automotive Device for acting upon a pressure sensor mounted on a flow plug
US7185621B2 (en) * 2004-08-05 2007-03-06 Ngk Spark Plug Co., Ltd. Glow plug with combustion pressure detecting function
US20100300186A1 (en) * 2006-10-13 2010-12-02 Christoph Kern Pressure-Measuring Device
US7905209B2 (en) * 2007-08-30 2011-03-15 Denso Corporation Glow plug with combustion pressure sensor
US20100079155A1 (en) * 2008-09-30 2010-04-01 Ngk Spark Plug Co., Ltd. Pressure detection apparatus
US8217309B2 (en) * 2008-12-15 2012-07-10 Federal-Mogul Italy Srl. Glow plug with pressure sensing canister
US8893545B2 (en) * 2011-02-25 2014-11-25 Ngk Spark Plug Co., Ltd. Glow plug with combustion pressure sensor
US20130042831A1 (en) * 2011-08-19 2013-02-21 Ngk Spark Plug Co., Ltd. Glow plug fitted with combustion pressure detection sensor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140109661A1 (en) * 2012-10-24 2014-04-24 Borgwarner Beru Systems Gmbh Pressure gauge
US8978454B2 (en) * 2012-10-24 2015-03-17 Borgwarner Ludwigsburg Gmbh Pressure gauge
US20140216145A1 (en) * 2013-02-06 2014-08-07 Borgwarner Beru Systems Gmbh Combustion chamber pressure gauge
US8943877B2 (en) * 2013-02-06 2015-02-03 Borgwarner Beru Systems Gmbh Combustion chamber pressure gauge
US20160177909A1 (en) * 2014-12-22 2016-06-23 Ngk Spark Plug Co., Ltd. Glow plug with pressure sensor
US10253982B2 (en) * 2014-12-22 2019-04-09 Ngk Spark Plug Co., Ltd. Glow plug with pressure sensor
CN111454612A (zh) * 2019-01-22 2020-07-28 株式会社理光 硬化型透明墨水组合物，墨水套件，收容容器，印刷方法
US11332629B2 (en) 2019-01-22 2022-05-17 Ricoh Company, Ltd. Curable clear ink composition, storing container, ink set, printing method, printed matter, and cured material

Also Published As

Publication number Publication date
IN2013CH00563A (enrdf_load_stackoverflow) 2015-08-14
DE102012101215A1 (de) 2013-08-22
KR20130094233A (ko) 2013-08-23

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Legal Events

Date Code Title Description
AS Assignment

Owner name: BORGWARNER BERU SYSTEMS GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:POTTIEZ, CHRISTIAN;BOHNENKAMP, JOERN;WUESTENHAGEN, DIRK;AND OTHERS;REEL/FRAME:030043/0129

Effective date: 20130307

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION