DK201000401A - Improved monitoring of wear of bearings in a large two stroke diesel engine - Google Patents

Improved monitoring of wear of bearings in a large two stroke diesel engine Download PDF

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Publication number
DK201000401A
DK201000401A DKPA201000401A DKPA201000401A DK201000401A DK 201000401 A DK201000401 A DK 201000401A DK PA201000401 A DKPA201000401 A DK PA201000401A DK PA201000401 A DKPA201000401 A DK PA201000401A DK 201000401 A DK201000401 A DK 201000401A
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DK
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Prior art keywords
sensor
engine
controller
operating condition
level
Prior art date
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DKPA201000401A
Inventor
Christensen Henrik Willads
Olsson Martin
Original Assignee
Man Diesel & Turbo Deutschland
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Application filed by Man Diesel & Turbo Deutschland filed Critical Man Diesel & Turbo Deutschland
Priority to DK201000401A priority Critical patent/DK178172B1/en
Priority to JP2011090585A priority patent/JP5746547B2/en
Priority to KR1020110041461A priority patent/KR101693755B1/en
Priority to FI20115427A priority patent/FI123312B/en
Priority to CN201110117518.XA priority patent/CN102288408B/en
Priority to CH00779/11A priority patent/CH702986B1/en
Publication of DK201000401A publication Critical patent/DK201000401A/en
Priority to FI20125874A priority patent/FI125410B/en
Application granted granted Critical
Publication of DK178172B1 publication Critical patent/DK178172B1/en

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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
    • F02B77/083—Safety, indicating or supervising devices relating to maintenance, e.g. diagnostic device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/12—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load
    • F16C17/24—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load with devices affected by abnormal or undesired positions, e.g. for preventing overheating, for safety
    • F16C17/246—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load with devices affected by abnormal or undesired positions, e.g. for preventing overheating, for safety related to wear, e.g. sensors for measuring wear
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • G01M13/04—Bearings
    • 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
    • G01M15/06—Testing internal-combustion engines by monitoring positions of pistons or cranks
    • 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
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two

Abstract

An apparatus for monitoring wear of a crosshead bearing, a crankpin bearing and a main bearing in a large two stroke diesel engine, said apparatus comprising at least two sensors, wherein said sensors are arranged and configured for measuring a bottom dead centre level in a given cylinder relative to a fixed point of the engine, wherein said apparatus further comprises a controller configured to: receive a signal from each sensor; compensate each signal depending on an engine operating condition such as a speed; and determine whether a threshold value has been exceeded and if SO issue an indication of the exceeded threshold.

Claims (70)

  1. CLAIMS :
  2. 1. Apparatus for monitoring wear of a crosshead bearing, a crankpin bearing and a main bearing in a large two stroke diesel engine, said apparatus comprising at least two sensors, wherein said sensors are arranged anc. configured for measuring a bottom dead centre level in a given cylinder relative to a fixed point cf the engine, wherein said apparatus further comprises a controller configured no: receive a signal from each sensor; compensate each signal depending on an operating condition; determine a deviation to accommodate for factors influencing the sensor signal; determine whether a threshold value has been exceeded anc if so issue an indication of the exceeded threshold.
  3. 2. An apparatus according to claim 1, wherein sale controller is configured to determine a sensor deviation fer each sensor based on the received sensor values to determine each sensor's deviation from the average of the other sensors .
  4. 3. An apparatus according to claim 1, wherein said engine further comprises at least one cylinder and sale controller is further configured to determine a cylinder deviation for each cylinder based on the received sensor values to determine the sensors of each cylinder's deviation from the average of the other sensors.
  5. 4. An apparatus according to claim 1, wherein sale controller is configured to determine if a thresholc value is exceeded by comparing a threshold value with a compensated sensor value.
  6. 5. An apparatus according to claim 1, wherein sale controller is configured to determine if a thresholc. value is exceeded by comparing a threshold value with a devia Lion .
  7. 6. An apparatus according to claims 2 and 5, wherein sale controller is configured to determine if a thresholc value is exceeced by comparing a threshold value with a sensor deviation.
  8. 7. An apparatus according to claims 3 and 5, wherein said controller is configured to determine if a thresholc. value is exceec.ed by comparing a threshold value with a cylinder deviation.
  9. 8. An apparatus according to claim 1, wherein a thresholc. value corresponds to one taken from a group comprising a pre-warning, an alarm and a slow-down.
  10. 9. An apparatus according to claim 1, wherein sale, operating condition is an engine speed. 1C. An apparatus according to claim 1, wherein sale, operating condition is a propeller pitch level.
  11. 11. An apparatus according to claim 1, wherein sale, operating condition is a load.
  12. 12. A method for implementation in an apparatus having a controller arranged to execute instructions stored on a physical medium, said method being for monitoring «rear of a crosshead bearing, a crankpin bearing and a main bearing in a large two stroke diesel engine, said apparatus comprising at least two sensors, wherein saic. sensors are arranged and configured for measuring a bcttom dead centre level in a given cylinder relative to a fixed point of rhe engine, wherein said method comprises : receiving a signal from each sensor; ccmpensating each signal depending on an engine operating ccndition; determining a deviation to accommodate for factors influencing the sensor signal; determining whether a threshold value has been exceeded and if so issue an indication of the exceeded threshold.
  13. 12. Apparatus for monitoring wear of a crosshead bearing, a crankpin bearing and a main bearing in a large two stroke diesel engine, said apparatus comprising at least two sensors, wherein said sensors are arranged anc. configured for measuring a. bottom dead centre level in a given cylinder relative to a fixed point cf the engine, wherein said apparatus further comprises a controller configured so; receive a signal from each sensor; compensate each signal depending on an engine operating ccndition; determine whether a threshold value has been exceeded and if so issue an indication of the exceeded threshold and wherein said controller is further configured to change the threshold value dynamically according to current operation of the engine.
  14. 14. The apparatus of claim 13 wherein said controller is configured to determine that an operating condition changes and in response thereto raise the threshold level.
  15. 15. The apparatus of claim 13 wherein said operating condition is an engine speed.
  16. 16. An apparatus according to claim 13, wherein said operating condition is a propeller pitch level.
  17. 17. An apparatus according to claim 13, wherein sale operating condition is a load.
  18. 18. The apparatus of claim 14 wherein said controller is configured to determine that the operating condition is not changing and in response thereto lower the threshold value . IS. The apparatus of claim 21 wherein said controller is configured to lower the threshold level after a delay time period has lapsed since the operating condition changed . 2C. A method fer implementation in an apparatus having a controller arranged to execute instructions stored on a physical medium, said method being for monitoring wear of a crosshead bearing, a crankpin bearing and a main bearing in a large two stroke diesel engine, sale apparatus comprising at least two sensors, wherein sale sensors are arranged and configured for measuring a bottom dead centre level in a given cylinder relative to a fixed point of rhe engine, wherein said method comprises : receiving a signal from each sensor; ccmpensating each signal depending on an engine operating condition; delermininy wheLher a Lhreshold value has been exceeded and if so issue an indication of the exceeded threshold and wherein said method further comprises changing the threshold value dynamically according to current operation of the engine.
  19. 21. Apparatus for monitoring wear of a crosshead bearing, a crankpin bearing and a main bearing in a large two stroke diesel engine, said apparatus comprising at least two sensors, wherein said sensors are arranged and configured for measuring a bottom dead centre level in a given cylinder relative to a fixed point of the engine and wherein said at least two sensors are arranged so that there are two sensors in each cylinder, one fore and one aft sensor, wherein said apparatus further comprises a controller configured to: receive a signal from each sensor; compensate each signal depending on an engine operating condition; determine whether a threshold value has been exceeded and if so issue an indication of the exceeded threshold anc. wherein said controller is further configured to: determine that a bearing is worn out or in a critical condition by combining the signal oi the fore sensor of a first cylinder to the signal of the aft sensor of a second cylinder, and/or determine that a bearing is worn out or in a critical condition by combining the signal of the fore sensor of a first cylinder to the signal of the aft sensor of the same cylinder and compare the result of the two sensor signals with sale Lhreshold level.
  20. 22. The apparatus of claim 21 wherein said controller is configured to compare a combined signal value to a doubled threshold level.
  21. 23. An apparatus according to claim 21, wherein sale operating condition is an engine speed.
  22. 24. An apparatus according to claim 21, wherein sale operating condition is a propeller pitch level.
  23. 25. An apparatus according to claim 21, wherein sale operating condition is a load.
  24. 26. A method for Implementation in an apparatus having a centroller arranged to execute instructions stored on a physical medium, said method being for monitoring wear of a crosshead bearing, a crankpin bearing and a main bearing in a large two stroke diesel engine, sale apparatus comprising at least two sensors, wherein sale sensors are arranged and configured for measuring a bottom dead centre level in a given cylinder relative to a fixed point of che engine, wherein said method comprises : receiving a signal from each sensor; compensating each signal depending on an engine operating condition; determining whether a threshold value has been exceeded and if so issue an indication of the exceeded threshold and wherein said method further comprises determining that a bearing is worn out or in a critical condition by comparing the signal of the fore sensor of a first cylinder to the signal of the aft sensor of a second cylinder, and/or determining that a bearing is worn out or in a critical condition by comparing the signal of the fore sensor of a first cylinder to the signal of the aft sensor of the same cylinder and combining the two sensor signals and comparing the result of the two sensor signals with said threshold level.
  25. 27. Apparatus for monitoring wear of a crosshead bearing, a crankpin bearing and a main bearing in a large two stroke diesel engine, said apparatus comprising at least two sensors, wherein said sensors are arranged ana configured for measuring a bottom dead centre level in a given cylinder relative to a fixed point of the engine, wherein said apparatus further comprises a controller configured ro: receive a signal from each sensor; compensate each signal depending on an engine operating condition; determine whether a threshold value has been exceeded and if so issue an indication of the exceeded threshold and wherein said controller is further configured to: detect a rapid change in bottom dead centre level by comparing the received sensor signals to an average level of sensor signals for a previous time period.
  26. 28. The apparatus of claim 27 wherein the time period compared to precedes the measured sensor values by a second time period.
  27. 22. The apparatus of claim 27 wherein said controller is configured Lo compare Ihe average of a set of received sensor signals with the average level of the previous time period. 3C. The apparatus of claim 27 wherein said controller is configured to determine rate of change from the difference between the average level of a previous time period and ohe current level.
  28. 31. An apparatus according to claim 27, wherein saic. operating condition is an engine speed.
  29. 32. An apparatus according to claim 27, wherein said operating condition is a propeller pitch level.
  30. 33. An apparatus according to claim 27, wherein saic operating condition is a load.
  31. 34. A method for implementation in an apparatus having a controller arranged to execute instructions stored on a physical medium, said method being for monitoring wear of a crosshead bearing, a crankpin bearing and a main bearing in a large two stroke diesel engine, saic. apparatus comprising at least two sensors, wherein saic. sensors are arranged and configured for measuring a bottom dead centre level in a given cylinder relative to a fixed point of ohe engine, wherein said methoc comprises : receiving a signal from each sensor; compensating each signal depending on an engine operating condition; determining whether a threshold value has been exceedec. and if so issue an indication of the exceeded threshold and wherein said method further comprises deLecLiny a rapid change in BDC level by comparing Lhe received sensor signal to an average level of sensor signals for a previous time period.
  32. 35. Apparatus for monitoring wear of a crosshead bearing, a crankpin bearing and a main bearing in a large two stroke diesel engine, said apparatus comprising at least two sensors, wherein said sensors are arranged and configured for measuring a bottom dead centre level in a given cylinder relative to a fixed point of the engine, wherein said apparatus further comprises a controller configured no: receive a signal from each sensor; compensate each signal depending on an engine operating condition; determine whether a threshold value has been exceeded and if so issue an indication of the exceeded threshold and wherein said controller is further configured to: detect a rapid change in bottom dead centre level by updating a reference level for a sensor; updating a present level for a sensor and determining a reference value and determining whether the reference value exceeds a rapid change threshold level.
  33. 36. The apparatus of claim 35 wherein the controller is configured to update the reference level based on an exponential moving average.
  34. 37. The apparatus of claim 36 wherein an update factor fcr the exponential moving average indicates a slow update .
  35. 38. The apparatus of claim 35 wherein the controller is configured Lo updaLe Lhe present level based on an exponential moving average. 3S. The apparatus of claim 38 wherein an update factor fcr the exponential moving average indicates a fast update . 4C. The apparatus of claim 35 wherein said reference value is the difference between the reference level anc. the present level for a sensor.
  36. 41. The apparatus of claim 36 wherein said reference value is a sum of the difference between the reference level and the present level for one sensor belonging to one cylinder and the difference between the reference level and the present level for the other sensor belonging to the same cylinder.
  37. 42. The apparatus of claim 35 wherein said reference value is a sum of the difference between the reference level and the present level for one sensor belonging to one cylinder and the difference between the reference level and the present level for the other sensor belonging to the a neighbouring cylinder.
  38. 43. The apparatus according to claim 35, wherein said operating condition is an engine speed.
  39. 44. The apparatus according to claim 35, wherein sale operating condition is a propeller pitch level.
  40. 45. The apparatus according to claim 35, wherein sale operating condition is a load.
  41. 46. The apgiaraLus oT claim 35 wherein said rapid change threshold level is dynamic.
  42. 47. The apparatus of claim 35 wherein said controller is configured to determine the dynamic threshold level basec. on a change in engine speed.
  43. 48. The apparatus of claim 47 wherein said controller is further configured to determine the dynamic threshold level based on a change in engine speed compared to a reference speed, said reference speed being an exponential moving average of engine speeds .
  44. 43. The apparatus of claim 48 wherein said controller is further configured to determine the dynamic threshold level based on a change in engine speed and an amplification constant. 5C. The apparatus of claim 48 wherein said controller is further configured to determine the dynamic threshold level based on a change in engine speed, a delay constant, a number of received engine speeds since a last determination of a rapid change threshold level and an amplification constant.
  45. 51. The apparatus of claim 35, wherein said engine is a large two-ssroke diesel engine.
  46. 52. A method for monitoring wear of a crosshead bearing, a crankpin bearing and a main bearing in an engine, said apparatus comprising at least two sensors, wherein said sensors are arranged and configured for measuring a bottom dead centre level in a given cylinder relative to a fixed point of the engine, wherein saic. apparatus fur Idler comprises a conLroller configured Lo: receive a signal from each sensor; compensate each signal depending on an engine operating condition; determine whether a threshold value has been exceeded anc. if so issue an indication of the exceeded threshold anc wherein said controller is further configured to: detect a rapid change in bottom dead centre level by updating a reference level for a sensor; updating a present level for a sensor and determining a reference value and determining whether the reference value exceeds a rapid change threshold level.
  47. 53. Apparatus for monitoring wear of a crosshead bearing, a crankpin bearing and a main bearing in a large two stroke diesel engine, said apparatus comprising at least two sensors, wherein said sensors are arranged anc. configured for measuring a bottom dead centre level in a given cylinder relative to a fixed point of the engine, wherein said apparatus further comprises a controller configured so: receive a signal from each sensor; compensate each signal depending on an engine operating condition; determine whether a threshold value has been exceeded anc. if so issue an indication of the exceeded threshold anc wherein said controller is further configured to generate an engine operating condition compensation table during operation of said engine during a learning phase by sampling a firsL number of sensor values in relation to a second number of engine operation condition points during operation of said engine, anc as the first number of samples have been received for a engine operation condition determine a reference value by averaging the received s ample values for that speed point.
  48. 54. An apparatus according to claim 53, wherein sale controller is configured to determine a rough calibration estimate of an engine operating condition compensation by: receiving signal values from at least one sensor over a period of time for a first engine operating condition; averaging the signal values to generate a first reference value; and extrapolating from the first reference value for the engine operating condition to other engine operating conditions using a pre-deterrnined estimated change factor; wherein said controller is configured to compensate further received signal values according to the rough calibration estimate during said learning phase .
  49. 55. An apparatus according to claim 54, wherein sale ccntroller is further configured to update said rough calibration estimate by receiving signal values from at least one sensor over a period of time for one second engine operating condition; averaging Lhe signal values Lo generaLe a second reference value; interpolating between the first and the second reference values for speeds in between the first and the second speed; and extrapolating from the first and seconc. reference value for engine operating conditions lying outside the first and second engine operating condition using the pre-determined estimated change factor; wherein said controller is configured to compensate further received signal values according to the rough calibration estimate during a learning phase.
  50. 56. An apparatus according to claim 53, wherein sale. operating condition is an engine speed and said engine operating condition point is a speed point.
  51. 57. An apparatus according to claim 53, wherein sale, operating condition is a propeller pitch level.
  52. 58. An apparatus according to claim 53, wherein sale operating condition is a load.
  53. 53. An apparatus according to claim 56, wherein sale ccntroller is configured to receive signals for three engine speeds, said three engine speeds being: a first engine speed is taken from the range 20 to 5C % of a nominal engine speed; a second engine speed is taken from the range 50 to 80 % of a nominal engine speed; and a third engine speed is taken from the range 80 to ICO % of a nominal engine speed. 6C. An apparatus according to claim 55, wherein sale controller is further configured to update said rough calibration estimate to an engine operating condition compensation table during said learning phase.
  54. 61. An apparatus according to claim 54, wherein sale, controller is further configured so re-determine the reference value for each engine operating condition point at a time interval and updating said engine operating condition compensation table with the new reference values .
  55. 62. An apparatus according to claim 61, wherein sale controller is further configured to determine whether a reference value for a engine operating condition point is changed by a factor compared to a first obtained reference value and if so activate an alarm.
  56. 63. An apparatus according to claim 60, wherein sale, controller is further configured to update said engine operating condition compensation table after sale learning phase by interpolating and extrapolating between values cf the engine operating condition compensation table and rough calibration estimate. 64 . A method for implementation in an apparatus having a controller arranged to execute instructions stored on a physical medium, said method being for monitoring "wear of a crosshead bearing, a crankpin bearing and a main bearing in a large two stroke diesel engine, saic apparatus comprising at least two sensors, wherein said sensors are arranged and configured for measuring a bottom dead centre level in a given cylinder relative to a fixed point of she engine, wherein said method comprises : receiving a signal from each sensor; ccmpensdLiny each siynal depending on an engine opera Line condition; determining whether a threshold value has been exceeded and if so issue an indication of the exceeded threshold and wherein said method further comprises generating an engine operating condition compensation table during operation of said engine during a learning phase by sampling a first number of sensor values ir. relation to a second number of engine operaring condition points during operation of said engine and as the first number of samples have been received for a engine operating condition point determine a reference value by averaging the received sample values for that engine operating condition point.
  57. 65. Apparatus for monitoring wear of a crosshead bearing, a crankpin bearing and a main bearing in a large two stroke diesel engine, said apparatus comprising at least two sensors, wherein said sensors are arranged anc. configured for measuring a bottom dead centre level in a given cylinder relative to a fixed point cf the engine, wherein said apparatus further comprises a controller configured ro: receive a signal from each sensor; compensate each signal depending on an engine operating condition; and wherein said controller is further configured oo readjust the compensation for a sensor by adjusting the signals from a sensor by compensating the signal value according to a operating condition compensation look-up table by calculating an average of an offset for the sensor over a period of Lime and offseL Lhe reference values for an affected sensor according to the calculated average offset.
  58. 66. The apparatus of claim 65, wherein said controller is configured to base the re-adjustment on a combination of the signals from a neighbouring sensor and an average taken over a period of time before and after the an event necessitating the readjustment.
  59. 67. The apparatus of claim 65 wherein said controller is configured to use the operating condition compensation table for a neighbouring sensor while re-adjusting the s ensor.
  60. 68. The apparatus of claim 65 wherein said controller Is ccnfigured to calculate an offset (0) for the sensor after a time period for re-adjusting the sensor has lapsed wherein the controller is configured to calculate the offset for the sensor through: 0 = Oi + a3tb + Ta2 wherein 01 is the offset during the time the sensor was broken; tb is the time the sensor was broken; a2 is the slope of a curve corresponding to the values of an operating condition compensating table during the readjustment period a3 is the slope of a curve corresponding to the values of an operating condition compensating table for a neighbouring sensor and T is the time period for re-adjusting the sensor.
  61. 69. The apparatus of claim 66 wherein said controller is configured Lo exclude a sensor when calculating sensor-deviation and/or cylinder deviation for the other sensors during the time period after the event necessitating the readjustmenr time period for the sensor.
  62. 7 C. An apparatus according to claim 65, wherein said operating condition is one of an engine speed, a propeller pitch level and a load.
  63. 71. A method fcr implementation in an apparatus having a controller arranged to execute instructions stored on a physical medium, said method being for monitoring wear of a crosshead bearing, a crankpin bearing and a main bearing in a large two stroke diesel engine, said apparatus comprising at least two sensors, wherein said sensors are arranged and configured for measuring a bottom dead centre level in a given cylinder relative to a fixed point of che engine, wherein said methoc. comprises : receiving a signal from each sensor; compensating each signal depending on an engine operating condition; determining whether a threshold value has been exceeded and if so issue an indication of the exceeded threshold and wherein said method further comprises readjusting the compensation for a sensor by adjusting the signals from a sensor by compensating the signal value according to an operating condition compensation look-up table by calculating an average of an offset for the sensor over a period of time and offset the reference values for an affected sensor according to the calculated average offset.
  64. 72. Apparatus for monitoring wear of a crosshead bearing, a crankpin bearing and a main bearing in a large two stroke diesel engine, said apparatus comprising at least two sensors, wherein said sensors are arranged and ccnfigured for measuring a bottom dead centre level in a given cylinder relative to a fixed point of the engine, wherein said apparatus further comprises a controller ccnfigured co: receive a signal from each sensor; compensate each signal depending on an engine operating condition; determine whether a threshold value has been exceeded and if so issue an indication of the exceeded threshold, anc. wherein said controller is further configured to: generate trend curves showing if any wear has taken place during a time interval.
  65. 73. The apparatus of claim 72 wherein said controller is ccnfigured to store filtered values with a time stamp for each sensor in a short-term storage and to store maximum, minimum, and average filtered values for each sensor in a long-term storage.
  66. 74. The apparatus of claim 72 wherein said controller is configured to determine whether an alarm limit is exceeded, and if so store a copy of the short-term storage in a long term storage.
  67. 75. The apparatus of claim 74 wherein the controller is configured to include data for 5 minutes after the time of the alarm in the copy.
  68. 76. The apparalus of claim 72 wherein said conLroller is configured to store the maximum, minimum, and average filtered values every 6 running hours.
  69. 77. A method for implementation in an apparatus having a controller arranged to execute instructions stored on a physical medium, said method being for monitoring wear of a crosshead bearing, a crankpin bearing and a main bearing in a large two stroke diesel engine, said apparatus comprising at least two sensors, wherein saic. sensors are arranged and configured for measuring a bottom dead centre level in a given cylinder relative to a fixed point of che engine, wherein said method, comprises : receiving a signal from each sensor; compensating each signal depending on an engine operating condition; determining whether a threshold value has been exceedec and if so issue an indication of the exceeded threshold and wherein said method further comprises generating trend curves showing if any wear has taken place during a time interval.
  70. 78. An engine comprising an apparatus according to claim 1, 13, 21, 27, 53, 65 or 72, wherein said engine is a large two-stroke marine diesel engine. 8C. A marine vessel comprising an engine according to one of claims 51 or 78.
DK201000401A 2010-05-07 2010-05-07 Improved monitoring of wear of bearings in a large two stroke diesel engine DK178172B1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DK201000401A DK178172B1 (en) 2010-05-07 2010-05-07 Improved monitoring of wear of bearings in a large two stroke diesel engine
JP2011090585A JP5746547B2 (en) 2010-05-07 2011-04-15 Improved monitoring of bearing wear in large two-cycle diesel engines
KR1020110041461A KR101693755B1 (en) 2010-05-07 2011-05-02 Improved monitoring of wear of bearing in a large two stroke diesel engine
FI20115427A FI123312B (en) 2010-05-07 2011-05-05 IMPROVED STORAGE MONITORING IN A LARGE TWO-STOCK DIESEL ENGINE
CN201110117518.XA CN102288408B (en) 2010-05-07 2011-05-06 Apparatus and method for monitoring wear of a crosshead bearing in stroke diesel engine
CH00779/11A CH702986B1 (en) 2010-05-07 2011-05-06 Improved monitoring the wear of bearings in a two-stroke large Diesel engine.
FI20125874A FI125410B (en) 2010-05-07 2012-08-22 Improved bearing wear control on large 2-stroke diesel engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK201000401 2010-05-07
DK201000401A DK178172B1 (en) 2010-05-07 2010-05-07 Improved monitoring of wear of bearings in a large two stroke diesel engine

Publications (2)

Publication Number Publication Date
DK201000401A true DK201000401A (en) 2011-11-08
DK178172B1 DK178172B1 (en) 2015-07-20

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DK201000401A DK178172B1 (en) 2010-05-07 2010-05-07 Improved monitoring of wear of bearings in a large two stroke diesel engine

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JP (1) JP5746547B2 (en)
KR (1) KR101693755B1 (en)
CN (1) CN102288408B (en)
CH (1) CH702986B1 (en)
DK (1) DK178172B1 (en)
FI (2) FI123312B (en)

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CH702986A2 (en) 2011-11-15
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JP5746547B2 (en) 2015-07-08
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CH702986B1 (en) 2012-06-29
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FI125410B (en) 2015-10-15
FI123312B (en) 2013-02-15

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