GB2166195A - Monitoring i.c. engine exhaust valve sealing - Google Patents
Monitoring i.c. engine exhaust valve sealing Download PDFInfo
- Publication number
- GB2166195A GB2166195A GB08526344A GB8526344A GB2166195A GB 2166195 A GB2166195 A GB 2166195A GB 08526344 A GB08526344 A GB 08526344A GB 8526344 A GB8526344 A GB 8526344A GB 2166195 A GB2166195 A GB 2166195A
- Authority
- GB
- United Kingdom
- Prior art keywords
- light conductor
- sensor
- warning device
- engine
- signal
- 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.)
- Granted
Links
- 238000007789 sealing Methods 0.000 title description 6
- 238000012544 monitoring process Methods 0.000 title 1
- 239000004020 conductor Substances 0.000 claims abstract description 20
- 238000002485 combustion reaction Methods 0.000 claims abstract description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 claims description 3
- 239000000446 fuel Substances 0.000 claims description 2
- 238000013022 venting Methods 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 claims 1
- 239000000835 fiber Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 8
- 230000006378 damage Effects 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- KGNDCEVUMONOKF-UGPLYTSKSA-N benzyl n-[(2r)-1-[(2s,4r)-2-[[(2s)-6-amino-1-(1,3-benzoxazol-2-yl)-1,1-dihydroxyhexan-2-yl]carbamoyl]-4-[(4-methylphenyl)methoxy]pyrrolidin-1-yl]-1-oxo-4-phenylbutan-2-yl]carbamate Chemical compound C1=CC(C)=CC=C1CO[C@H]1CN(C(=O)[C@@H](CCC=2C=CC=CC=2)NC(=O)OCC=2C=CC=CC=2)[C@H](C(=O)N[C@@H](CCCCN)C(O)(O)C=2OC3=CC=CC=C3N=2)C1 KGNDCEVUMONOKF-UGPLYTSKSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 229940125833 compound 23 Drugs 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
-
- 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
- F02B77/082—Safety, indicating, or supervising devices relating to valves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/38—Investigating fluid-tightness of structures by using light
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2800/00—Methods of operation using a variable valve timing mechanism
- F01L2800/11—Fault detection, diagnosis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2820/00—Details on specific features characterising valve gear arrangements
- F01L2820/04—Sensors
-
- 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
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Testing Of Engines (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
A sensor (11) reacts to the phenomenon caused on the outer side of the exhaust valve when a leak occurs during combustion in the engine's cylinder. A warning system (17) is connected to the sensor (11) for producing an alarm on the occurrence of a valve leak. The sensor (11) can monitor light, heat or pressure. A light sensor (Fig. 2) has a tapering quartz glass conductor (21) leading to a fibre optic cable 28. <IMAGE>
Description
SPECIFICATION
System for supervising the functioning of an internal combustion engine
This invention relates to a system, in accordance with the introductory part of patent claim 1, for supervising the tightness of an exhaust valve in the cylinder of an internal combustion engine.
High requirements are today set on the operating reliability of power engines, for example, ship and off-shore diesel engines. At the same time it is desired to have maintenance intervals that are as long as possible along with short interruptions of operation in connection with periodic maintenance and any required replacement of components. It is therefore important to detect the appearance of a fault in an engine as quickly as possible so that repair of the fault can be undertaken before more expensive secondary damage can arise as a consequence of the initial fault.
In a diesel engine, the sealing surfaces of the exhaust valves and their valve seat rings are particularly susceptible to damage owing to the high thermal and mechanical load to which they are subjected. The temperature of the valves may attain temperatures in the range 600 to 700"C, a temperature at which the hot exhaust gases can easily cause corrosion and pitting of the sealing surfaces. Pitted areas can serve as the start of cracks, which in time lead to fatigue failure. The hard coke particles which remain in between the surfaces of the valve and the seat ring cause pitting in the surfaces. As a result of this pitting phenomenon, corrosion, wear and tear or a fracture, a blow-past is created at the valve and this can, in a short time, lead to destruction of the cylinder unit and/or an associated turbo-charger.
The aim of the present invention is to create a protective device, based on the detection of blowpast, which immediately upon the occurrence of a fault causing leakage at a valve, produces an alarm by giving an appropriate signal to the machine operator, a control device or some other warning system. In this way repair and maintenance measures can be undertaken before the fault has had time to cause major damage.
The distinctive features of the invention are set out in the following claim 1.
The invention is based on the observation that when even a small fault has arisen in the valve's seat surface, as a result of corrosion, wear and tear or cracks, the large overpressure prevailing in the combustion chamber seeks to be released through this unsealed point during the ignition and combustion phase. The pressure wave that passes through the damaged sealing surfaces thus forces burning gas into the exhaust port. The detector which is located in the exhaust port in the vicinity of the valve seat surface and which reacts to a pressure wave or to a thermal impulse or flame contained in it, causes an alarm in the warning system.A protective system according to the invention furthermore has the advantage that it is capable of detecting a fault and registering an alarm, even in the event of such abnormal operation of a combustion engine as, for example, late injection of fuel or afterburning.
In normal conditions, combustion should be completed in the combustion chamber of the larger so-called low-speed or medium-speed diesel engines. Accordingly, the combustion phase should be completed when the exhaust valves open for gas exchange. Thus there is no need to connect a control device that monitors the engine's operating rate to a light-sensitive sensor, because the light impulse which appears in the exhaust port is always an indication of abnormal operation of the engine.
On the other hand, a sensor that reacts to a thermal or pressure impulse should be connected to a device which, by measuring the duration of the impulse, comparing the time of the impulse with respect to the cylinder phase or by means of some other corresponding method, prevents a warning signal from being communicated ahead as a result of thermal or pressure impulses which relate to normal operating conditions. Several cylinders are generally connected to a common exhaust port and forthis reason various kinds of pressure oscillation occur simultaneously in such a common port.It is also known that the temperature of the exhaust gases of a diesel engine is not a constant when arriving at the exhaust port but may vary 100--150"C between different cylinders, the average temperature being 300600 C depending on the
RPM of the engine, the load on the engine or similar factors. The measurement range and alarm limit of the temperature or pressure sensor must be specified on the basis of empirical values to function within the framework of a known precisely defined spectrum.
The temperature in the exhaust port of a diesel engine may easily be in the temperature range 600-70000 and even the temperature of the engine's cover may well be over a hundred degrees centigrade. In addition, the engine is subjected to a large amount of vibration. Accordingly, it is advantageous, from the standpoint of operating reliability, to locate the electronic components (such as photoelectric cells etc.) of the system outside the engine and, possibilities permitting, to locate these with the control device of the protected machinery.
It is also advantageous to place the sensor in a socket from which it may be easily removed for repair or cleaning.The shape and location of the sensor's receiving end should be arranged in such a way that when the valves are open during gas exchange, the flow of exhaust gas occasions as efficient as possible a self-cleaning effect. In locating the sensor, care should also be taken that the reaction area of the sensitive end of the sensor is able to fully monitor the entire sealed surface between the respective valve seat and its valve.
The invention is further described, by way of example, in the following which should be read in conjunction with the accompanying drawings, in which:
Figure 1 shows part of the installation arrangement of a system according to the invention, and
Figure 2 shows a cross section of the structure of one form of sensor for use in a system according to the invention.
Reference 11 in Figure 1 indicates a sensor element which is attached to a cylinder head 4 of a diesel engine in such a way that the upper or proximal end of the sensor is located outside the cylinder head and its distal end or detector 14 is located in an exhuast port 7 of the diesel engine. The sensor element extends through a cooling water compartment 9 of the engine head 4 and is rigidly mounted therein by means of a screw thread 16. The junction points are made water- and pressure-tight by means of seals 15 and 18 (eg o-rings).
The movement of an exhaustvalve 5 in a valve stem guide 10 is synchronized in the usual way to the strokes of the cylinder piston by means of the crankshaft (not shown). During the ignition and combustion phase, the combustion chamber 3 (which is the closed space delimited by the upper surface of the piston 1, the cylinder liner 2, the cylinder head 4 as well as the exhaust and intake valves-the intake valve not being depicted) acquires an over-pressure that presses the exhaust valve 5 tightly against its valve seat 6. If the sealing surface between an exhaust valve 5 and its valve seat 6 has worn away or become damaged, the overpressure prevailing in the combustion chamber 3 seeks to escape through the worn or damaged region into the exhaust port 7.This phenomenon, which is herein referred to as blow-past, causes penetration of the burning gas or flame (shown at 13), accompanied by a pressure impulse, into the exhaust port 7. The detector 14 reacts to either the light emission, the heat wave or the pressure impulse of the blow-past in such a way that when a blow-past has occurred, the detector either directly or indirectly causes an alarm to be registered in a warning device (shown schematically at 17) of the machinery. The sensitive sector of the sensing element's detector 14 is shown at 29 and is of such an extent that is able to supervise the entire sealing surface between a valve seat 6 and its exhaust valve 5.
Figure 2 shows the structure of one embodiment of sensor 14 that reacts to light A light conductor 21, which is manufactured from quartz glass or a similar light-transmitting material capable of withstanding the operating conditions to which it is subjected, is located in a sleeve 22 which is preferably composed of a ceramic or similar refractory material.
The light conductor 21 tapers in the upward direction, thus serving to concentrate the light The sleeve 22 is either directly cast into an inner casing 20 or is subsequently installed there in solid form.
By means of a thread 26, the casing is mounted in an outer casing 19. In this way, the light conductor 21 may be easily removed from the cylinder head for repair, for replacement or for cleaning of its distal end. A flexible heat transfer compound 23 is arranged betwen the inner and outer casings and serves to even out the forces arising on the light conductor as a result of temperature differences occurring in use.
By means of a connection 24, a second light conductor 28 is optically connected to the upper end of the light conductor 21, this second light conductor 28 preferably being made of a cable of optical fibres and being connected at one of its ends to a photoelectric cell forming part of the warning device 17. Connection 24 is protected by a cover 25, which is anchored to the inner casing 20 either by a thread 27 or by a crimp connection. Alternatively, the photoelectric cell can be mounted directly in the connection 24, whereby any signal generated by the cell is sent via an electric wire to the warning device 17. The photoelectric cell can be sensitive to the infrared range of the electromagnetic spectrum.
In place of a photocell any suitable photoelectric transducer can be used e.g. a photo cell, a lightemitting diode or an element based on fluorescence, photon emission or a corresponding photoelectromagnetic function.
The installation and external shape of a sensor 14 that reacts to a pressure impulse or a heat wave is in principle of the same kind as described above for a light-sensitive sensor. In these cases, the detector is located at the lower end of the sensor in place of the light conductor and is constituted by a temperaturesensitive element, a pressure gauge or a similar transducer. The temperature-sensitive element could be any known transducer which, for example, converts heat into some other quantity, such as a mechanical movement, a pressure, an electric current or a change in ohmic resistance according to temperature (eg. with positive or negative coefficients icients of temperature/resistance dependence).
In connection with warning device 17, for some applications of the invention, it is necessary to install a control system which by comparing the detector-supplied impulse with the current phase state of the enging (eg. measuring the duration of the detected signal or by some corresponding means) prevents the forward travel of the detector signal to the warning device when the respective exhaust valve is in its open position allowing gas venting from the respective cylinder.
The warning device can incorporate a micro processor or other computing or signal-handling means and can form part of a control station for operator control of the engine.
The invention is not limited to the embodiment illustrated, since several variations of the invention can be conceived of within the ambit of the following claims.
Claims (20)
1. A system for supervising the tightness of an exhaust valve in the cylinder of an internal combustion engine, while the engine is operating, which comprises a sensor, which reacts to a phenomenon caused on the outer side of the exhaust valve by a leak taking place during fuel ignition or combustion occurring in the cylinder, and a warning device connected to this sensor which is arranged to generate an alarm signal on the appearance of a valve leak.
2. A system according to claim 1, in which the sensor is located in the exhaust port of the engine in the immediate vicinity of the valve seat.
3. A system according to claim 1 or claim 2, in which the sensor includes an element that reacts to light and comprises a light conductor which is manufactured from a light transmitting material that withstands the operating temperature and pressure arising on the occasion of a leak, the distal end of the light conductor being in the vicinity of the valve seat and the proximal end extending outside the cylinder head and incorporating a photoelectric transducer.
4. A system according to claim 3, in which the photoelectric transducer is a photo cell, a lightemitting diode, or an element based on fluorescence, photon emission or a corresponding photoelectromagnetic function.
5. A system according to claim 3 or claim 4, in which the light conductor narrows in the direction from the distal end to the proximal end.
6. A system according to any one of claims 3 to 5, in which the light conductor is manufactured from quartz glass.
7. A system according to any one of claims 3 to 6, in which the photoelectric transducer is directly adjacent to the proximal end of the light conductor.
8. A system according to any one of claims 3 to 6, in which the protoelectric transducer is located at the end of a second light conductor in optical communication with the proximal end of the firstmentioned light conductor.
9. A system according to claim 8, in which the second light conductor is a cable of optical fibres.
10. A system according to any one of the claims 3 to 7, in which an output signal generated by the photoelectric transducer is an electric signal fed to an electrically operating warning device.
11. A system according to claim 10, in which the warning device incorporates a microprocessor or other computing or signal-handling device.
12. A system according to claim 10 or claim 11, in which the warning device forms part of a control station for operator control of the engine.
13. A system according to any one of claims 3 to
12, in which the first-mentioned light conductor has
a protective sleeve located in a socket having separate outer and inner casings, there being,
between the casings, a layer of material serving to
even out the forces arising as a result of temperature differences.
14. A system according to claim 13, in which the outer casing of the socket is removably and sealingly mounted in the cylinder head, and the inner casing of the socket is mounted such that it can be loosened separately from the outer casing for the purpose of cleaning the distai end of the light conductor and/or replacing the light conductor.
15. A system according to any one of claims 3 to 14 in which the range of sensitivity of the sensor includes the infrared range of the electromagnetic spectrum.
16. A system according to claim 1 or 2, in which the sensor comprises a temperature sensitive element which reacts to heat and which is adapted to generate a signal to the warning device when the sensed temperature rises to a specified level.
17. A system according to claim 1 or 2, in which the sensor incorporates a pressure-sensing device, which is adapted to generate a signal to the warning device when the sensed pressure exceeds a specified value.
18. A system according to any one of the preceding claims in which the warning device incorporates a control system which is adapted to prevent the forward progress of a signal from the detector to the warning device when the respective exhaust valve is in its open position allowing gas venting from the respective cylinder of the engine.
19. A system for supervising the tightness of an exhaust valve in an internal combustion engine during operation of the latter, substantially as hereinbefore described with reference to the accompanying drawings.
20. A diesel engine incorporating a supervisory system as claimed in any preceding claim.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI844226A FI70981C (en) | 1984-10-26 | 1984-10-26 | ANORDNING FOER OEVERVAKNING AV EN FOERBRAENNINGSMOTORS FUNKTION |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8526344D0 GB8526344D0 (en) | 1985-11-27 |
| GB2166195A true GB2166195A (en) | 1986-04-30 |
| GB2166195B GB2166195B (en) | 1988-09-07 |
Family
ID=8519797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08526344A Expired GB2166195B (en) | 1984-10-26 | 1985-10-25 | System for supervising the functioning of an internal combustion engine |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS61180124A (en) |
| DE (1) | DE3538066A1 (en) |
| FI (1) | FI70981C (en) |
| FR (1) | FR2572462B1 (en) |
| GB (1) | GB2166195B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2193804A (en) * | 1986-01-25 | 1988-02-17 | Lucas Ind Plc | Combustion sensing device |
| FR2623148A1 (en) * | 1987-11-12 | 1989-05-19 | Bosch Gmbh Robert | CONTROL SYSTEM FOR A MOTOR VEHICLE FOR MEASURING PHYSICAL SIZES SUCH AS ROTATION SPEED, TEMPERATURE OR OTHER |
| WO1992011457A1 (en) * | 1990-12-21 | 1992-07-09 | Beta Machinery Analysis Ltd. | Method and apparatus for analyzing the operating condition of a machine |
| FR2870341A1 (en) * | 2004-05-13 | 2005-11-18 | Assistance Documentation Indus | Valve seat assembling controlling method for heat engine, involves acquiring and processing image, and measuring space value between housing bottom and lower support side of seat by using variable resulting from calibration |
| DE102014207016A1 (en) * | 2014-04-11 | 2015-10-15 | Bayerische Motoren Werke Aktiengesellschaft | Method and device for checking a valve train in an internal combustion engine |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3606352A1 (en) * | 1986-02-27 | 1987-09-03 | Zeiss Carl Fa | LIGHT COLLECTING OPTICS FOR A FLAME DETECTOR |
| JP2521548Y2 (en) * | 1990-11-01 | 1996-12-25 | 三菱重工業株式会社 | Exhaust valve failure diagnostic device |
| DE102005004248A1 (en) * | 2005-01-28 | 2006-08-03 | Johann A. Krause Maschinenfabrik Gmbh | Drive unit e.g. internal combustion engine`s, movable component e.g. valve`s, position determining method, involves illuminating or exposing movable component to light source and determining discontinuity of light passage between components |
| DE102014115093A1 (en) | 2014-10-16 | 2016-04-21 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Cylinder head assembly |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2104958A (en) * | 1981-08-31 | 1983-03-16 | Sulzer Ag | Monitoring the sealing- tightness of an internal combustion engine valve by temperature detection |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5147696B2 (en) * | 1972-06-13 | 1976-12-16 | ||
| DE2535686A1 (en) * | 1975-08-09 | 1977-02-10 | Freudenberg Carl Fa | METHOD OF LIGHT GAP TESTING OF LIP SEALS MADE OF ELASTOMERS |
| DD152388A1 (en) * | 1980-07-28 | 1981-11-25 | Heyo Mennenga | METHOD FOR DETECTING WELDING CHANNELS TO MOTOR VALVES |
| DD152605A1 (en) * | 1980-08-08 | 1981-12-02 | Heyo Mennenga | METHOD AND ARRANGEMENT FOR DETECTING LEAKS TO VALVES OF ENGINES |
| DE3241390A1 (en) * | 1981-11-10 | 1983-05-19 | Nippondenso Co., Ltd., Kariya, Aichi | FUEL INJECTION DEVICE FOR DIESEL ENGINES |
| JPS60216015A (en) * | 1984-04-11 | 1985-10-29 | Ishikawajima Harima Heavy Ind Co Ltd | Blow-off monitoring device for intake or exhaust valves in internal-combustion engine |
-
1984
- 1984-10-26 FI FI844226A patent/FI70981C/en not_active IP Right Cessation
-
1985
- 1985-10-25 FR FR8515866A patent/FR2572462B1/en not_active Expired - Lifetime
- 1985-10-25 GB GB08526344A patent/GB2166195B/en not_active Expired
- 1985-10-25 JP JP23924885A patent/JPS61180124A/en active Pending
- 1985-10-25 DE DE19853538066 patent/DE3538066A1/en not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2104958A (en) * | 1981-08-31 | 1983-03-16 | Sulzer Ag | Monitoring the sealing- tightness of an internal combustion engine valve by temperature detection |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2193804A (en) * | 1986-01-25 | 1988-02-17 | Lucas Ind Plc | Combustion sensing device |
| GB2193804B (en) * | 1986-01-25 | 1989-12-06 | Lucas Ind Plc | Combustion sensing device |
| FR2623148A1 (en) * | 1987-11-12 | 1989-05-19 | Bosch Gmbh Robert | CONTROL SYSTEM FOR A MOTOR VEHICLE FOR MEASURING PHYSICAL SIZES SUCH AS ROTATION SPEED, TEMPERATURE OR OTHER |
| WO1992011457A1 (en) * | 1990-12-21 | 1992-07-09 | Beta Machinery Analysis Ltd. | Method and apparatus for analyzing the operating condition of a machine |
| FR2870341A1 (en) * | 2004-05-13 | 2005-11-18 | Assistance Documentation Indus | Valve seat assembling controlling method for heat engine, involves acquiring and processing image, and measuring space value between housing bottom and lower support side of seat by using variable resulting from calibration |
| DE102014207016A1 (en) * | 2014-04-11 | 2015-10-15 | Bayerische Motoren Werke Aktiengesellschaft | Method and device for checking a valve train in an internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3538066A1 (en) | 1986-04-30 |
| FI844226L (en) | 1986-04-27 |
| GB8526344D0 (en) | 1985-11-27 |
| FR2572462A1 (en) | 1986-05-02 |
| FR2572462B1 (en) | 1992-04-03 |
| FI70981C (en) | 1986-10-27 |
| FI844226A0 (en) | 1984-10-26 |
| GB2166195B (en) | 1988-09-07 |
| FI70981B (en) | 1986-07-18 |
| JPS61180124A (en) | 1986-08-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 20051024 |