USH2034H1 - Instrumentation spark plug - Google Patents
Instrumentation spark plug Download PDFInfo
- Publication number
- USH2034H1 USH2034H1 US09/046,005 US4600598A USH2034H US H2034 H1 USH2034 H1 US H2034H1 US 4600598 A US4600598 A US 4600598A US H2034 H USH2034 H US H2034H
- Authority
- US
- United States
- Prior art keywords
- optical fiber
- imaging lens
- optical
- piston
- spark plug
- 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
- 238000003384 imaging method Methods 0.000 claims abstract description 29
- 238000002485 combustion reaction Methods 0.000 claims abstract description 25
- 239000000835 fiber Substances 0.000 claims abstract description 19
- 239000013307 optical fiber Substances 0.000 claims description 24
- 230000003287 optical effect Effects 0.000 claims description 17
- 239000012212 insulator Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 7
- PFNQVRZLDWYSCW-UHFFFAOYSA-N (fluoren-9-ylideneamino) n-naphthalen-1-ylcarbamate Chemical compound C12=CC=CC=C2C2=CC=CC=C2C1=NOC(=O)NC1=CC=CC2=CC=CC=C12 PFNQVRZLDWYSCW-UHFFFAOYSA-N 0.000 claims description 6
- 229910052594 sapphire Inorganic materials 0.000 claims description 4
- 239000010980 sapphire Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 229910052732 germanium Inorganic materials 0.000 claims description 3
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 3
- 229910052714 tellurium Inorganic materials 0.000 claims description 3
- 230000001427 coherent effect Effects 0.000 abstract description 6
- 238000002405 diagnostic procedure Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- ZXEYZECDXFPJRJ-UHFFFAOYSA-N $l^{3}-silane;platinum Chemical compound [SiH3].[Pt] ZXEYZECDXFPJRJ-UHFFFAOYSA-N 0.000 description 1
- 206010010071 Coma Diseases 0.000 description 1
- 229920004943 Delrin® Polymers 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000002800 charge carrier Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 229910021339 platinum silicide Inorganic materials 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0014—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation from gases, flames
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/04—Casings
- G01J5/041—Mountings in enclosures or in a particular environment
Definitions
- the present invention relates generally to systems and methods for the diagnostic testing of internal combustion engines and more particularly to an instrumented spark plug useful for optically viewing the interior of a combustion chamber of an operating internal combustion engine.
- the invention provides an instrumented spark plug system for measuring the thermal profile across a piston surface within an internal combustion engine during normal operation, and includes a coherent optical fiber bundle contained within a specially constructed spark plug, and lens system optically connected to a high speed triggerable imaging infrared (IR) video camera.
- IR infrared
- FIG l shows schematically two cylinders of an internal combustion engine and placement of the instrumented spark plug and associated equipment of the invention
- FIG. 2 is a view in axial section of a spark plug of the FIG. 1 system
- FIG. 3 is a schematic of representative imaging optics for imaging a piston surface onto the coherent fiber optic array of the system of FIGS. 1 and 2;
- FIG. 4 is an enlarged view of the imaging optics of FIG. 3 .
- FIG. 1 shows schematically two adjacent or complementary cylinders 12 , 13 of an internal combustion engine 10 (e.g. cylinders 1 and 4 of a conventional eight-cylinder gasoline engine), cylinders 12 , 13 being equipped with instrumented spark plugs 11 , 11 ′ of the invention.
- Cylinders 12 , 13 typically include respective combustion chambers 14 , 15 , pistons 16 , 17 , piston rods 18 , 19 , fuel intake ports 20 , 21 , exhaust ports 22 , 23 , spark plug wells 24 , 25 and cam 26 operatively connected to rods 18 , 19 .
- two separate embodiments are presented for temperature observation of surfaces 16 ′, 17 ′ of pistons 16 , 17 .
- incoherent fiber optic bundle 31 operatively connects plug 11 on cylinder 12 to the sensor head of spot temperature sensor 27 (commercially available remote sensing thermometer) for measuring the temperature of a spot on surface 16 ′ of piston 16 .
- Coherent fiber optic bundle 34 connects plug 11 ′ on cylinder 13 to relay optical system 35 and IR imaging radiometric temperature sensor 29 (e.g. platinum silicide IR video camera) for imaging surface 17 ′ of piston 17 and producing a temperature profile across surface 17 ′.
- IR imaging radiometric temperature sensor 29 e.g. platinum silicide IR video camera
- any suitably temperature resistant fiber optic bundle may be used as selected by one skilled in the applicable art guided by these teachings, an arsenic-selenium-tellurium imaging fiber bundle operating at wavelengths of about 3-5 microns ( ⁇ m) being preferred and included in a system built and operated in demonstration of the invention.
- Fiber bundle 31 in the demonstration system was about one meter long with individual fibers having a 125 ⁇ m diameter core and 10 ⁇ m thick cladding, giving fiber-to-fiber spacing of about 135 ⁇ m.
- Conventional personal computer 37 may provide means for controlled temperature data acquisition and image capture for displaying the imagery on monitor 38 . Measurements may be made at any selected position of the piston 16 , 17 strokes using triggering off cam 26 .
- Plug 40 should be structured for operating as a normal spark plug but be capable also of relaying the maximum practical optical energy characterizing the piston surface.
- Plug 40 therefore includes a central coherent optical fiber bundle 41 having at first end 42 thereof one or more imaging lenses 43 , 44 and an optical window 45 of sapphire, diamond, zinc selenide or other suitable temperature resistant optical material transparent to the wavelength range of interest (3-5 ⁇ m).
- Lenses 43 , 44 , fiber bundle 41 and window 45 are all axially aligned central of the structure of plug 40 in order to minimize effects of engine vibration and reflection losses.
- Fiber bundle 41 is surrounded by electrically conducting tube 47 serving as a charge carrier (cathode) to spark gap 48 .
- Fiber bundle 41 and conducting tube 47 are surrounded by tubular ceramic insulator 49 composed of any suitable material customarily used in conventional spark plug construction. Typical dielectric strengths of extruded type ceramics useful for insulator 49 range from about 400 to 800 volts/mil and the spark plug generates up to about 30,000 volts under full load. Insulator 49 is therefore about 80 mils thick for adequate insulation.
- Insulator 49 separates tube (cathode) 47 of plug 40 from the main body (anode) 51 which terminates in tip 52 and defines spark gap 48 between tip 52 and tube 47 .
- Spark gap 48 is disposed to one side of optical axis O along which fiber bundle 41 , lenses 43 , 44 and window 45 are disposed, which allows line-of-sight measurement of the surface of the piston (not shown in FIG. 2) within its combustion chamber.
- Water jacket 55 may be included in the structure of plug 40 as suggested in FIG. 2 and operatively connected to a source (not shown) of coolant water to avoid overheating of plug 40 constituent parts from engine heat during operational use of the invention.
- Thermally insulating outer shells 57 , 58 of material such as DELRIN®, any suitable ceramic, or the like may be included to insulate cathode 46 and conducting tube 47 from engine heat.
- Means such as threads 59 may be included on the outer surface of plug 40 so that plug 40 may be received by engine 1 O as suggested in FIG. 1 .
- FIGS. 3 and 4 are schematic illustrations of representative two-lens imaging optics suitable for imaging a surface 60 of a piston onto the optical fiber bundle 41 of the invention.
- Optical window 45 (nominally 1 inch thick sapphire) protects imaging lenses 43 , 44 from the heat of combustion chamber 61 .
- Lenses 43 , 44 are nominally about 6 mm in diameter in order to accommodate size restrictions imposed on plug 40 , and may comprise any suitable materials as would occur to the skilled artisan guided by these teachings, such as germanium or zinc selenide as illustrated in FIG. 4 .
- Lenses 43 , 44 are cemented together and fiber bundle 41 is cemented to the back side of lens 44 as suggested in FIG. 4 using conventional IR index matching cement 63 .
- the first (input) surface of lens 43 serves as the stop and may preferably have an antireflection coating .
- Lenses 43 , 44 correct some field curvature, coma, astigmatism and spherical aberrations and image the scene onto the input surface of fiber bundle 41 .
- the invention therefore provides an instrumentation spark plug for viewing the combustion process within a combustion chamber of an internal combustion engine. It is understood that modifications to the invention may be made to the invention as might occur to one with skill in the field of the invention within the scope of the appended claims. All embodiments contemplated hereunder which achieve the objects of the invention have therefore not been shown in complete detail. Other embodiments may be developed without departing from the spirit of the invention or from the scope of the appended claims.
Abstract
A spark plug system for measuring the thermal profile across the surface of a piston in an operating internal combustion engine in characterizing the combustion process within a combustion chamber of the engine is described that includes a specially constructed spark plug containing a coherent fiber optic bundle and lens system optically connected to a remote sensing thermometer and high-speed triggerable imaging infrared video camera.
Description
The invention described herein may be manufactured and used by or for the Government of the United States for all governmental purposes without the payment of any royalty.
The present invention relates generally to systems and methods for the diagnostic testing of internal combustion engines and more particularly to an instrumented spark plug useful for optically viewing the interior of a combustion chamber of an operating internal combustion engine.
The invention provides an instrumented spark plug system for measuring the thermal profile across a piston surface within an internal combustion engine during normal operation, and includes a coherent optical fiber bundle contained within a specially constructed spark plug, and lens system optically connected to a high speed triggerable imaging infrared (IR) video camera. The system images the piston surface onto the face of the optical fiber bundle in near real time and transmits the images to the video camera, thereby obtaining spot temperature measurements at each engine cycle.
It is therefore a principal object of the invention to provide an instrumented spark plug.
It is another object of the invention to provide a system for the diagnostic testing of an internal combustion engine.
It is a further object of the invention to provide a system for obtaining temperature profile information on a piston within an operating internal combustion engine.
It is a further object of the invention to provide an instrumented spark plug for diagnostic testing of an internal combustion engine.
These and other objects of the invention will become apparent as a detailed description of representative embodiments proceeds.
In accordance with the foregoing principles and objects of the invention, a spark plug system for measuring the thermal profile across the surface of a piston in an operating internal combustion engine in characterizing the combustion process within a combustion chamber of the engine is described that includes a specially constructed spark plug containing a coherent fiber optic bundle and lens system optically connected to a high-speed triggerable imaging infrared video camera.
The invention will be more clearly understood from the following detailed description of representative embodiments thereof read in conjunction with the accompanying drawings wherein:
FIG l shows schematically two cylinders of an internal combustion engine and placement of the instrumented spark plug and associated equipment of the invention;
FIG. 2 is a view in axial section of a spark plug of the FIG. 1 system;
FIG. 3 is a schematic of representative imaging optics for imaging a piston surface onto the coherent fiber optic array of the system of FIGS. 1 and 2; and
FIG. 4 is an enlarged view of the imaging optics of FIG. 3.
In the drawings, FIG. 1 shows schematically two adjacent or complementary cylinders 12,13 of an internal combustion engine 10 (e.g. cylinders 1 and 4 of a conventional eight-cylinder gasoline engine), cylinders 12,13 being equipped with instrumented spark plugs 11,11′ of the invention. Cylinders 12,13 typically include respective combustion chambers 14,15, pistons 16,17, piston rods 18,19, fuel intake ports 20,21, exhaust ports 22,23, spark plug wells 24,25 and cam 26 operatively connected to rods 18,19. In the representative system of the invention of FIG. 1, two separate embodiments are presented for temperature observation of surfaces 16′,17′ of pistons 16,17.
In FIG. 1, incoherent fiber optic bundle 31 operatively connects plug 11 on cylinder 12 to the sensor head of spot temperature sensor 27 (commercially available remote sensing thermometer) for measuring the temperature of a spot on surface 16′ of piston 16. Coherent fiber optic bundle 34 connects plug 11′ on cylinder 13 to relay optical system 35 and IR imaging radiometric temperature sensor 29 (e.g. platinum silicide IR video camera) for imaging surface 17′ of piston 17 and producing a temperature profile across surface 17′. Any suitably temperature resistant fiber optic bundle may be used as selected by one skilled in the applicable art guided by these teachings, an arsenic-selenium-tellurium imaging fiber bundle operating at wavelengths of about 3-5 microns (μm) being preferred and included in a system built and operated in demonstration of the invention. Fiber bundle 31 in the demonstration system was about one meter long with individual fibers having a 125 μm diameter core and 10 μm thick cladding, giving fiber-to-fiber spacing of about 135 μm.
Conventional personal computer 37 may provide means for controlled temperature data acquisition and image capture for displaying the imagery on monitor 38. Measurements may be made at any selected position of the piston 16,17 strokes using triggering off cam 26.
Referring now to FIG. 2, shown therein is a view in axial section of an instrumented spark plug 40, similar in structure to plugs 11,11′ of FIG. 1, representative of the invention. For optimum operation of the invention, plug 40 should be structured for operating as a normal spark plug but be capable also of relaying the maximum practical optical energy characterizing the piston surface. Plug 40 therefore includes a central coherent optical fiber bundle 41 having at first end 42 thereof one or more imaging lenses 43,44 and an optical window 45 of sapphire, diamond, zinc selenide or other suitable temperature resistant optical material transparent to the wavelength range of interest (3-5 μm). Lenses 43,44, fiber bundle 41 and window 45 are all axially aligned central of the structure of plug 40 in order to minimize effects of engine vibration and reflection losses. Fiber bundle 41 is surrounded by electrically conducting tube 47 serving as a charge carrier (cathode) to spark gap 48. Fiber bundle 41 and conducting tube 47 are surrounded by tubular ceramic insulator 49 composed of any suitable material customarily used in conventional spark plug construction. Typical dielectric strengths of extruded type ceramics useful for insulator 49 range from about 400 to 800 volts/mil and the spark plug generates up to about 30,000 volts under full load. Insulator 49 is therefore about 80 mils thick for adequate insulation. Insulator 49 separates tube (cathode) 47 of plug 40 from the main body (anode) 51 which terminates in tip 52 and defines spark gap 48 between tip 52 and tube 47. Spark gap 48 is disposed to one side of optical axis O along which fiber bundle 41, lenses 43,44 and window 45 are disposed, which allows line-of-sight measurement of the surface of the piston (not shown in FIG. 2) within its combustion chamber. Water jacket 55 may be included in the structure of plug 40 as suggested in FIG. 2 and operatively connected to a source (not shown) of coolant water to avoid overheating of plug 40 constituent parts from engine heat during operational use of the invention. Thermally insulating outer shells 57,58 of material such as DELRIN®, any suitable ceramic, or the like may be included to insulate cathode 46 and conducting tube 47 from engine heat. Means such as threads 59 may be included on the outer surface of plug 40 so that plug 40 may be received by engine 1O as suggested in FIG. 1.
The size of a standard spark plug requires that the instrumented plug of the invention include miniature lenses 43,44 for transmitting an image of the piston surface into fiber bundle (41, FIG. 2). Lens requirements for the instrumented plug may be determined using a PC based lens design program such as ZEMAX (mfgd by Focus Software, Inc.). FIGS. 3 and 4 are schematic illustrations of representative two-lens imaging optics suitable for imaging a surface 60 of a piston onto the optical fiber bundle 41 of the invention. Optical window 45 (nominally 1 inch thick sapphire) protects imaging lenses 43,44 from the heat of combustion chamber 61. Lenses 43,44 are nominally about 6 mm in diameter in order to accommodate size restrictions imposed on plug 40, and may comprise any suitable materials as would occur to the skilled artisan guided by these teachings, such as germanium or zinc selenide as illustrated in FIG. 4. Lenses 43,44 are cemented together and fiber bundle 41 is cemented to the back side of lens 44 as suggested in FIG. 4 using conventional IR index matching cement 63. The first (input) surface of lens 43 serves as the stop and may preferably have an antireflection coating . Lenses 43,44 correct some field curvature, coma, astigmatism and spherical aberrations and image the scene onto the input surface of fiber bundle 41.
The invention therefore provides an instrumentation spark plug for viewing the combustion process within a combustion chamber of an internal combustion engine. It is understood that modifications to the invention may be made to the invention as might occur to one with skill in the field of the invention within the scope of the appended claims. All embodiments contemplated hereunder which achieve the objects of the invention have therefore not been shown in complete detail. Other embodiments may be developed without departing from the spirit of the invention or from the scope of the appended claims.
Claims (12)
1. A spark plug system for measuring the thermal profile across the surface of a piston in an operating internal combustion engine, comprising:
(a) an optical fiber having first and second ends disposed along an optical axis;
(b) an imaging lens disposed at said first end of said optical fiber and axially aligned therewith for transmitting along said optical fiber an image of a surface of a piston within an operating internal combustion engine;
(c) a temperature resistant substantially optically transparent optical window on said imaging lens for protecting said imaging lens from heat within the engine;
(d) an electrically conducting tube surrounding said optical fiber, imaging lens and optical window near said first end of said optical fiber, said tube comprising a first electrode;
(e) a tubular ceramic insulator surrounding said conducting tube;
(f) means defining a second electrode external of said tubular ceramic insulator, said second electrode terminating at one end thereof near said first end of said optical fiber and defining a spark gap between said second and first electrodes near said first end of said optical fiber;
(g) means external of said second electrode for engaging a spark plug well of the engine; and
(h) means operatively connected to said second end of said optical fiber for controlled temperature data acquisition and image capture for displaying images of said piston surface transmitted by said optical fiber.
2. The system of claim 1 wherein said optical window comprises a material selected from the group consisting of sapphire, diamond and zinc selenide transparent to optical wavelengths in the range of about 3 to 5 microns.
3. The system of claim 1 wherein said optical fiber comprises an arsenic-selenium-tellurium imaging fiber bundle for operation at wavelengths of about 3-5 microns.
4. The system of claim 1 wherein said imaging lens comprise a material selected from the group consisting of germanium and zinc selenide.
5. The system of claim 4 further comprising an antireflection coating on said imaging lens.
6. A spark plug system for measuring the thermal profile across the surface of a piston in an operating internal combustion engine, comprising:
(a) an optical fiber having first and second ends disposed along an optical axis;
(b) an imaging lens disposed at said first end of said optical fiber and axially aligned therewith for transmitting along said optical fiber an image of a surface of a piston within an operating internal combustion engine;
(c) a temperature resistant optical window on said imaging lens for protecting said imaging lens from heat within the engine, said optical window being substantially transparent to optical wavelengths in the range of 3 to 5 microns;
(d) an electrically conducting tube surrounding said optical fiber, imaging lens and optical window near said first end of said optical fiber, said tube comprising a first electrode;
(e) a tubular ceramic insulator surrounding said conducting tube;
(f) means defining a second electrode external of said tubular ceramic insulator, said second electrode terminating at one end thereof near said first end of said optical fiber and defining a spark gap between said second and first electrodes near said first end of said optical fiber; and
(g) thread means external of said second electrode for threadably engaging a spark plug well of the engine.
7. The system of claim 6 further comprising an imaging radiometric temperature sensor operatively connected to said second end of said optical fiber for imaging the surface of the piston.
8. The system of claim 6 further comprising a remote sensing thermometer operatively connected to said second end of said optical fiber for measuring the temperature of the surface of the piston.
9. The system of claim 6 wherein said optical window comprises a material selected from the group consisting of sapphire, diamond and zinc selenide.
10. The system of claim 6 wherein said optical fiber comprises an arsenic-selenium-tellurium imaging fiber bundle for operation at wavelengths of about 3-5 microns.
11. The system of claim 6 wherein said imaging lens comprises a material selected from the group consisting of germanium and zinc selenide.
12. The system of claim 11 further comprising an antireflection coating on said imaging lens.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/046,005 USH2034H1 (en) | 1998-03-23 | 1998-03-23 | Instrumentation spark plug |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/046,005 USH2034H1 (en) | 1998-03-23 | 1998-03-23 | Instrumentation spark plug |
Publications (1)
Publication Number | Publication Date |
---|---|
USH2034H1 true USH2034H1 (en) | 2002-07-02 |
Family
ID=21941048
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/046,005 Abandoned USH2034H1 (en) | 1998-03-23 | 1998-03-23 | Instrumentation spark plug |
Country Status (1)
Country | Link |
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US (1) | USH2034H1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006037251A1 (en) * | 2004-10-06 | 2006-04-13 | Kistler Holding Ag | Spark plug with optical sensor |
US7619742B2 (en) | 2007-06-28 | 2009-11-17 | Wisconsin Alumni Research Foundation | High-speed spectrographic sensor for internal combustion engines |
US8169476B2 (en) | 2006-11-02 | 2012-05-01 | GM Global Technology Operations LLC | In-cylinder imaging system using high-speed imaging device and high intensity light source for capturing images in combustion chamber |
Citations (12)
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---|---|---|---|---|
US4393687A (en) * | 1980-01-18 | 1983-07-19 | Robert Bosch Gmbh | Sensor arrangement |
US4425788A (en) * | 1981-02-25 | 1984-01-17 | Robert Bosch Gmbh | Combustion monitoring system for multi-cylinder internal combustion engine |
US4446723A (en) * | 1981-03-20 | 1984-05-08 | Robert Bosch Gmbh | Optical combustion event sensor structure particularly knock sensor for an internal combustion engine |
US4514656A (en) * | 1981-11-28 | 1985-04-30 | Robert Bosch Gmbh | Combination sparkplug and combustion process sensor |
US5033434A (en) * | 1989-03-08 | 1991-07-23 | Rover Group Limited | Method of controlling an internal combustion engine |
US5463222A (en) * | 1994-01-24 | 1995-10-31 | Colorado Seminary | Thermal imaging system for internal combustion engines |
US5659133A (en) * | 1996-04-22 | 1997-08-19 | Astropower, Inc. | High-temperature optical combustion chamber sensor |
US5714680A (en) * | 1993-11-04 | 1998-02-03 | The Texas A&M University System | Method and apparatus for measuring pressure with fiber optics |
US5754715A (en) * | 1996-11-12 | 1998-05-19 | Melling; Peter J. | Mid-infrared fiber-optic spectroscopic probe |
US5763769A (en) * | 1995-10-16 | 1998-06-09 | Kluzner; Michael | Fiber optic misfire, knock and LPP detector for internal combustion engines |
US5841546A (en) * | 1996-03-01 | 1998-11-24 | Foster-Miller, Inc. | Non-contact spectroscopy system and process |
US5895927A (en) * | 1995-06-30 | 1999-04-20 | The United States Of America As Represented By The Secretary Of The Air Force | Electro-optic, noncontact, interior cross-sectional profiler |
-
1998
- 1998-03-23 US US09/046,005 patent/USH2034H1/en not_active Abandoned
Patent Citations (12)
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US4393687A (en) * | 1980-01-18 | 1983-07-19 | Robert Bosch Gmbh | Sensor arrangement |
US4425788A (en) * | 1981-02-25 | 1984-01-17 | Robert Bosch Gmbh | Combustion monitoring system for multi-cylinder internal combustion engine |
US4446723A (en) * | 1981-03-20 | 1984-05-08 | Robert Bosch Gmbh | Optical combustion event sensor structure particularly knock sensor for an internal combustion engine |
US4514656A (en) * | 1981-11-28 | 1985-04-30 | Robert Bosch Gmbh | Combination sparkplug and combustion process sensor |
US5033434A (en) * | 1989-03-08 | 1991-07-23 | Rover Group Limited | Method of controlling an internal combustion engine |
US5714680A (en) * | 1993-11-04 | 1998-02-03 | The Texas A&M University System | Method and apparatus for measuring pressure with fiber optics |
US5463222A (en) * | 1994-01-24 | 1995-10-31 | Colorado Seminary | Thermal imaging system for internal combustion engines |
US5895927A (en) * | 1995-06-30 | 1999-04-20 | The United States Of America As Represented By The Secretary Of The Air Force | Electro-optic, noncontact, interior cross-sectional profiler |
US5763769A (en) * | 1995-10-16 | 1998-06-09 | Kluzner; Michael | Fiber optic misfire, knock and LPP detector for internal combustion engines |
US5841546A (en) * | 1996-03-01 | 1998-11-24 | Foster-Miller, Inc. | Non-contact spectroscopy system and process |
US5659133A (en) * | 1996-04-22 | 1997-08-19 | Astropower, Inc. | High-temperature optical combustion chamber sensor |
US5754715A (en) * | 1996-11-12 | 1998-05-19 | Melling; Peter J. | Mid-infrared fiber-optic spectroscopic probe |
Non-Patent Citations (1)
Title |
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J.P. Dakin, D.A. Kahn, A novel fibre-optic temperature probe, Optical and quantum electronics 9, 538-544, Jul. 1977. * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006037251A1 (en) * | 2004-10-06 | 2006-04-13 | Kistler Holding Ag | Spark plug with optical sensor |
US7696679B2 (en) | 2004-10-06 | 2010-04-13 | Kistler Holding, Ag | Spark plug with optical sensor |
US8169476B2 (en) | 2006-11-02 | 2012-05-01 | GM Global Technology Operations LLC | In-cylinder imaging system using high-speed imaging device and high intensity light source for capturing images in combustion chamber |
US7619742B2 (en) | 2007-06-28 | 2009-11-17 | Wisconsin Alumni Research Foundation | High-speed spectrographic sensor for internal combustion engines |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
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