DE19803470B4 - Method and device for determining the gas forces in the combustion chamber of an internal combustion engine - Google Patents
Method and device for determining the gas forces in the combustion chamber of an internal combustion engine Download PDFInfo
- Publication number
- DE19803470B4 DE19803470B4 DE1998103470 DE19803470A DE19803470B4 DE 19803470 B4 DE19803470 B4 DE 19803470B4 DE 1998103470 DE1998103470 DE 1998103470 DE 19803470 A DE19803470 A DE 19803470A DE 19803470 B4 DE19803470 B4 DE 19803470B4
- Authority
- DE
- Germany
- Prior art keywords
- internal combustion
- combustion engine
- combustion chamber
- sensor
- 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.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating or supervising devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
-
- 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
-
- 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
Abstract
Verfahren zum Bestimmen der Gaskräfte im Brennraum einer Brennkraftmaschine bei dem die Oberflächendehnungen von Bauteilen (10) der Brennkraftmaschine, die direkt oder indirekt vom Brennraumdruck in den Zylindern der Brennkraftmaschine mit einer Kraft beaufschlagt werden mittels mindestens eines kapazitiven Dehnungssensors (1) erfaßt werden und aus dem Ausgangssignal des Dehnungssensors (1) auf den Druck im Brennraum geschlossen wird, dadurch gekennzeichnet, daß die Dehnung mindestens eines, fest mit der Brennkraftmaschine verbundenen, Lagerarmes (10) erfaßt wird.Method for determining the gas forces in the combustion chamber of an internal combustion engine, in which the surface strains of components (10) of the internal combustion engine which are subjected to a force directly or indirectly from the combustion chamber pressure in the cylinders of the internal combustion engine are detected by means of at least one capacitive strain sensor (1) and from which Output signal of the strain sensor (1) is inferred about the pressure in the combustion chamber, characterized in that the strain is detected at least one, fixed to the internal combustion engine, bearing arm (10).
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Bestimmung der Gaskräfte im Brennraum einer Brennkraftmaschine gemäß den Oberbegriffen der Patentansprüche 1 und 2.The invention relates to a method and a device for determining the gas forces in the combustion chamber of an internal combustion engine according to the generic terms of claims 1 and 2.
Aufgrund der ständig verschärften gesetzlichen Vorschriften zur Überwachung von Verbrennungskraftmaschinen in Kraftfahrzeugen (z.B. On Board Diagnose OBD2) und den steigenden Anforderungen an die Laufkultur moderner Antriebsaggregate ist es notwendig, mehr Informationen über die Energieumsetzung bei der Verbrennung im Brennraum zu erhalten. Eine wichtige kennzeichnende Größe der Energieumsetzung im Brennraum ist der zeitliche Verlauf des Brennraumdruckes. Zur direkten Erfassung des Brennraumdruckes sind Brennraumdrucksensoren bekannt, deren Ausgangssignale für die Diagnose und Regelung der Verbrennung, zur Klopfregelung, zur Bestimmung der geleisteten Arbeit usw. ausgewertet werden. Eine solche direkte Erfassung des Druckes im Brennraum mittels darin angeordneter Drucksensoren ist mit hohen Bauteilekosten und einem erheblichen Mehraufwand bei der Konstruktion der Brennkraftmaschine, insbesondere des Brennraums verbunden.Due to the constantly tightening legal regulations for surveillance of internal combustion engines in motor vehicles (e.g. on board Diagnostics OBD2) and the increasing demands on running culture modern drive units, it is necessary to get more information about energy conversion when burning in the combustion chamber. An important characteristic of energy conversion in the combustion chamber is the time course of the combustion chamber pressure. to Direct detection of the combustion chamber pressure are combustion chamber pressure sensors known, the output signals for the Diagnosis and control of combustion, for knock control, for determination the work performed, etc. are evaluated. Such a direct capture the pressure in the combustion chamber by means of pressure sensors arranged therein is associated with high component costs and considerable additional effort the construction of the internal combustion engine, in particular the combustion chamber connected.
Desweiteren ist es bekannt (
Darüber hinaus werden zur Messung der Oberflächendehnung Dehnungsmeßstreifen eingesetzt. Bei diesem Verfahren wird die Widerstandsänderung von Flachwiderständen bei Verformung als Wirkprinzip für die Dehnungsmessung herangezogen. Nachteile dieser Verfahren sind die sehr geringe Lebensdauer der verwendeten Dehnmeßstreifen und die äußerst geringe Überlastsicherheit, so daß deren Einsatz in Kraftfahrzeugen Grenzen gesetzt sind.In addition to measuring the surface stretch strain used. With this procedure the change in resistance of flat resistors for deformation as a working principle for the strain measurement is used. Disadvantages of these methods are the very short lifespan of the strain gauges used and the extremely low overload safety, so that their use limits are set in motor vehicles.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung anzugeben, mit denen es auf kostengünstige und einfache Weise ermöglicht wird, die Gaskräfte im Brennraum einer Brennkraftmaschine zu bestimmen.The invention is based on the object To specify methods and an apparatus with which it is inexpensive and enables simple way will, the gas forces to be determined in the combustion chamber of an internal combustion engine.
Diese Aufgabe wird gemäß den Merkmalen der unabhängigen Patentansprüche 1 und 2 gelöst.This task is performed according to the characteristics of the independent claims 1 and 2 solved.
Erfindungsgemäß wird zur Analyse des Brennraumdruckes mindestens ein kapazitiver Dehnungssensor verwendet, der die Oberflächendehnung von Bauteilen erfaßt, welche direkt oder indirekt vom Zylinderdruck mit einer Kraft beaufschlagt werden. Bei diesen Bauteilen handelt es sich um einen, fest mit der Brennkraftmaschine verbundenen Lagerarm.According to the invention for the analysis of the combustion chamber pressure uses at least one capacitive strain sensor that measures the surface strain covered by components, which applies a force directly or indirectly from the cylinder pressure become. These components are one, fixed with the bearing arm connected to the internal combustion engine.
Anstelle der problematischen direkten Erfassung des Brennraumdruckes wird gemäß dem erfindungsgemäßen Verfahren auf eine indirekte Erfassung der Gaskräfte im Brennraum als Maß für die Energieumsetzung bei der Verbrennung zurückgegriffen.Instead of the problematic direct The combustion chamber pressure is recorded in accordance with the method according to the invention to an indirect detection of the gas forces in the combustion chamber as a measure of the energy conversion resorted to during combustion.
Durch eine solche indirekte Erfassung des Brennraumdruckes mit Hilfe preiswerter, alterungsbeständiger und überlastsicherer kapazitiver Dehnungssensoren können unerwünschte Verbrennungsabläufe, z.B. Klopfen bei einer Otto-Brennkraftmaschine oder Motorfehleinspritzungen bei einer Diesel-Brennkraftmaschine erkannt und negative Auswirkungen auf die Schadstoffemissionen und die Laufkultur sowie Schäden an der Brennkraftmaschine selbst vermieden werden. Da der Sensor außerhalb des Brennraums angeordnet ist, müssen keinerlei Veränderungen im Brennraum vorgenommen werden und die Sensoren sind geringeren Beanspruchungen in Form von Temperatur, Verschmutzung usw. ausgesetzt.Through such an indirect detection the combustion chamber pressure with the help of inexpensive, aging-resistant and overload-proof capacitive strain sensors can undesirable Combustion processes, e.g. Knock on an Otto internal combustion engine or incorrect engine injections in a diesel internal combustion engine recognized and negative effects on pollutant emissions and the running culture as well as damage be avoided on the internal combustion engine itself. Because the sensor outside the combustion chamber is arranged no changes be made in the combustion chamber and the sensors are smaller Exposed to stresses in the form of temperature, pollution, etc.
Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.Advantageous further developments of Invention result from the subclaims.
Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher beschrieben.Embodiments of the invention are shown in the drawing and are described in more detail below.
Es zeigenShow it
Die
Zur Kompensation temperaturabhängiger Dehnungen,
welche zu Fehlinterpretationen der vorliegenden Kräfte führen können, sollten
die zum Montieren am Bauteil nötigen
Befestigungspunkte des Sensorelementes bevorzugt auf einer Verbindungslinie
liegen, die unter einem Winkel von 40° – 50°, vorzugsweise 45° zur Richtung
der zu messenden Kraft bzw. Dehnung orientiert ist. In
Die nachfolgenden Figuren zeigen verschiedene Beispiele für besonders günstige Einbaulagen der Dehnungssensoren zur Erfassung der aus den Brennraumdrücken resultierenden Kräfte.The following figures show different examples of particularly cheap Installation positions of the strain sensors to record the resulting from the combustion chamber pressures Forces.
In
Alternativ zur dargestellten Einbaulage kann der Dehnungssensor auch in die Zylinderkopfdichtung integriert werden und dort die Radialdehnung des Dichtungsmaterials infolge der Druckbeaufschlagung durch die Verbrennung im Brennraum erfassen.As an alternative to the installation position shown the strain sensor can also be integrated into the cylinder head gasket and there the radial expansion of the sealing material as a result the pressures caused by combustion in the combustion chamber.
Eine weitere, sehr kostengünstige und
am leichtesten zu realisierende Möglichkeit für den Einbau der Dehnungssensoren
ist in
Das Ergebnis der Analyse kann genutzt werden, um kritische Zustände, wie z.B. das Klopfen bei einer Otto-Brennkraftmaschine oder Fehleinspritzungen und Undichtigkeiten an der Einspritzdüse bei einer Diesel-Brennkraftmaschine zu erkennen, das Gesamtabtriebsmoment der Brennkraftmaschine zu regeln und die Beiträge der einzelnen Zylinder zum Gesamtabtriebsmoment gleichzustellen. Darüberhinaus ist eine weitergehende Zustandsdiagnose für die einzelnen Zylinder, z.B. eine Kompressionsprüfung möglich.The result of the analysis can be used to critical conditions, such as. knocking on an Otto engine or faulty injections and injector leaks in a diesel engine to recognize to regulate the total output torque of the internal combustion engine and the posts of the individual cylinders equal to the total output torque. Furthermore is a further condition diagnosis for the individual cylinders, e.g. a compression test possible.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998103470 DE19803470B4 (en) | 1998-01-29 | 1998-01-29 | Method and device for determining the gas forces in the combustion chamber of an internal combustion engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998103470 DE19803470B4 (en) | 1998-01-29 | 1998-01-29 | Method and device for determining the gas forces in the combustion chamber of an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
DE19803470A1 DE19803470A1 (en) | 1999-08-12 |
DE19803470B4 true DE19803470B4 (en) | 2004-07-15 |
Family
ID=7856049
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1998103470 Expired - Fee Related DE19803470B4 (en) | 1998-01-29 | 1998-01-29 | Method and device for determining the gas forces in the combustion chamber of an internal combustion engine |
Country Status (1)
Country | Link |
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DE (1) | DE19803470B4 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007003377A1 (en) * | 2007-01-23 | 2008-07-31 | Man Diesel Se | Cylinder pressure measuring device for e.g. diesel engine, has sleeve with sections that are attached to components, such that length change of rod causes movement of sections and components, where sections are separated from each other |
DE102007003562A1 (en) * | 2007-01-24 | 2008-08-07 | Man Diesel Se | Cylinder pressure measuring device for e.g. diesel engine, has carrying sleeve attached to strain gauges, where elongation of sleeve and elongation of gauges produces elongation of tie rod, which is produced by cylinder pressure |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10006235C1 (en) * | 2000-02-11 | 2001-08-09 | Siemens Ag | Crank-drive mechanism for internal (IC) combustion engine - uses piezoresitive or capacitive strain-sensor or surface- wave component as force-sensor mounted on push-rod |
DE10018265B4 (en) * | 2000-04-13 | 2005-02-03 | IFT Ingenieurgesellschaft für Fahrzeugtechnik mbH | Measuring arrangement for the indirect combustion chamber pressure sensing of an internal combustion engine in operation |
DE10108051C2 (en) * | 2001-02-20 | 2003-04-03 | Siemens Ag | Device for measuring the combustion pressure |
DE10358523A1 (en) * | 2003-04-04 | 2004-10-28 | Bayerische Motoren Werke Ag | Test assembly for simulating gas forces in a combustion engine has a piston that can be placed in fixed positions in a combined cylinder and cylinder head arrangement to permit definition of varying test volumes |
DE10327147A1 (en) * | 2003-06-17 | 2005-01-05 | Daimlerchrysler Ag | Combustion engine cylinder pressure measurement device has a pressure sensor, optimally a magneto elastic sensor, mounted on the outer wall of the cylinder to produce a signal that is correlated with the wall strain |
DE502004004796D1 (en) * | 2003-10-16 | 2007-10-11 | Waertsilae Nsd Schweiz Ag | Device for monitoring the cylinder pressure |
DE102005004492B4 (en) * | 2005-02-01 | 2008-12-11 | Audi Ag | Device and method for measuring the cylinder pressure of an internal combustion engine |
US7117726B1 (en) * | 2005-06-17 | 2006-10-10 | Gm Global Technology Operations, Inc. | Method and apparatus for indirect measurement of engine cylinder pressure |
DE102006053806B4 (en) | 2006-11-15 | 2016-02-04 | Robert Bosch Gmbh | Internal combustion engine |
WO2015195037A1 (en) * | 2014-06-17 | 2015-12-23 | Scania Cv Ab | Method and device at compression braking of a vehicle |
Citations (7)
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---|---|---|---|---|
DE2527161A1 (en) * | 1974-09-16 | 1976-03-25 | Canadian Patents Dev | DEVICE FOR MEASURING PRESSURE IN CYLINDERS OF MACHINERY |
DE2917406A1 (en) * | 1979-04-28 | 1980-11-06 | Bosch Gmbh Robert | Carbon powder IC engine knock detector - has resistive path in head gasket, bolt and washer, or electrode mounted on head, with insulator |
DD210976A1 (en) * | 1982-10-19 | 1984-06-27 | Schwarze Pumpe Gas Veb | METHOD FOR PRESSURE MEASUREMENT ON PISTON FLUID MOTORS |
DE4015109A1 (en) * | 1990-05-11 | 1991-11-14 | Lechler Elring Dichtungswerke | CYLINDER HEAD GASKET |
EP0569608A1 (en) * | 1992-05-12 | 1993-11-18 | Siemens Aktiengesellschaft | Monitoring procedure for combustion engine cylinder pressure sensors |
WO1996005491A1 (en) * | 1994-08-16 | 1996-02-22 | Siemens Aktiengesellschaft | Force or extension sensor |
DE19539919A1 (en) * | 1994-10-26 | 1996-05-02 | Hitachi Ltd | Cylinder inner pressure sensing system for controlling multi-cylinder engine |
-
1998
- 1998-01-29 DE DE1998103470 patent/DE19803470B4/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2527161A1 (en) * | 1974-09-16 | 1976-03-25 | Canadian Patents Dev | DEVICE FOR MEASURING PRESSURE IN CYLINDERS OF MACHINERY |
DE2917406A1 (en) * | 1979-04-28 | 1980-11-06 | Bosch Gmbh Robert | Carbon powder IC engine knock detector - has resistive path in head gasket, bolt and washer, or electrode mounted on head, with insulator |
DD210976A1 (en) * | 1982-10-19 | 1984-06-27 | Schwarze Pumpe Gas Veb | METHOD FOR PRESSURE MEASUREMENT ON PISTON FLUID MOTORS |
DE4015109A1 (en) * | 1990-05-11 | 1991-11-14 | Lechler Elring Dichtungswerke | CYLINDER HEAD GASKET |
EP0569608A1 (en) * | 1992-05-12 | 1993-11-18 | Siemens Aktiengesellschaft | Monitoring procedure for combustion engine cylinder pressure sensors |
WO1996005491A1 (en) * | 1994-08-16 | 1996-02-22 | Siemens Aktiengesellschaft | Force or extension sensor |
DE19539919A1 (en) * | 1994-10-26 | 1996-05-02 | Hitachi Ltd | Cylinder inner pressure sensing system for controlling multi-cylinder engine |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007003377A1 (en) * | 2007-01-23 | 2008-07-31 | Man Diesel Se | Cylinder pressure measuring device for e.g. diesel engine, has sleeve with sections that are attached to components, such that length change of rod causes movement of sections and components, where sections are separated from each other |
DE102007003377B4 (en) * | 2007-01-23 | 2011-01-27 | Man Diesel & Turbo Se | Cylinder pressure measuring device |
DE102007003562A1 (en) * | 2007-01-24 | 2008-08-07 | Man Diesel Se | Cylinder pressure measuring device for e.g. diesel engine, has carrying sleeve attached to strain gauges, where elongation of sleeve and elongation of gauges produces elongation of tie rod, which is produced by cylinder pressure |
DE102007003562B4 (en) * | 2007-01-24 | 2010-12-16 | Man Diesel & Turbo Se | Cylinder pressure measuring device |
Also Published As
Publication number | Publication date |
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DE19803470A1 (en) | 1999-08-12 |
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OP8 | Request for examination as to paragraph 44 patent law | ||
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |