EP3008472A1 - Détermination de la vitesse angulaire dans un moteur - Google Patents

Détermination de la vitesse angulaire dans un moteur

Info

Publication number
EP3008472A1
EP3008472A1 EP14739211.2A EP14739211A EP3008472A1 EP 3008472 A1 EP3008472 A1 EP 3008472A1 EP 14739211 A EP14739211 A EP 14739211A EP 3008472 A1 EP3008472 A1 EP 3008472A1
Authority
EP
European Patent Office
Prior art keywords
measurement
flywheel
sensor
points
angular speed
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.)
Ceased
Application number
EP14739211.2A
Other languages
German (de)
English (en)
Inventor
Fredrik ÖSTMAN
Tom Kaas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wartsila Finland Oy
Original Assignee
Wartsila Finland Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wartsila Finland Oy filed Critical Wartsila Finland Oy
Publication of EP3008472A1 publication Critical patent/EP3008472A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/489—Digital circuits therefor

Definitions

  • the invention concerns in general the technical field of measurement arrangement. Especially the invention concerns measurement of angular speed of an engine.
  • one area of important parameters to measure is rotation dependent parameters of the engine, such as angular speed of a flywheel of the engine.
  • rotation dependent parameters of the engine such as angular speed of a flywheel of the engine.
  • one type of internal combustion engine comprises four cylinders, each of which accommodates a corresponding piston mechanically coupled to a crankshaft for transmitting the force generated by the combustion inside the cylinder to the crankshaft itself.
  • a flywheel is coupled to the crankshaft for storing the energy from the operation of the engine.
  • angular speed of the flywheel is measured by measuring the time it takes for the flywheel to rotate a certain number of holes or teeth. Assuming that the holes or teeth are machined in an equidistant manner the rotational angle can be calculated according to
  • the drawback in determining the angular speed of the flywheel by counting the number of holes or teeth in a period of time during rotation is that distances between holes or teeth in the flywheel may vary. This is due to tolerances in the machining precision of the holes or teeth. In practice, small tolerances in the hole or tooth positions can give rise to considerable errors in the measurement of angular speed, which are called geometric errors.
  • Fig. 1 illustrates a known solution for determining an angular speed of the flywheel 101 of an engine, such as internal combustion engine.
  • the flywheel ac- cording to the example comprises four holes 103A-103D.
  • the holes 103A- 103C are positioned equidistantly, but the position of the hole 103D deviates from the equidistant position, which is marked with 103D'.
  • the rotational motion of the flywheel is measured with a sensor 105 and a sensor system, which is configured to detect the holes during the rotational motion. Due to the geo- metric error in the position of the hole 103D (referred with Ae in Fig. 1 ) any angular speed measurement based at least partly on the hole 103D produces corresponding error in the speed.
  • the positioning tolerances in each of the holes, or teeth cause similar unpredictable error for the measurement.
  • An objective of the invention is to present a system and a method for determining an angular speed of a flywheel. Another objective of the invention is that the system and the method provide a solution to minimize geometric errors in the angular speed determination.
  • a system for determining an angular speed of a flywheel of an internal combustion engine comprises at least one sensor and a measurement unit wherein at least two measurement points are defined on the flywheel and wherein the measurement unit is configured to receive information from the sensor on detections, when each of the at least two measurement point arrives in detection space of the sensor during the angular motion of the flywheel; determine points of time of the detections; determine a time difference of a first detection of a measurement point by the sensor and a sequential detection of the same measurement point by the sensor for each of the at least two measurement points; and determine the angu- lar speed of the flywheel in relation to each of the at least two measurement points by dividing 360 degrees with the determined time difference.
  • the measurement unit may comprises a processor which is configured to identify the measurement point, which is detected by the sensor.
  • the identification may be based on at least one of the following: identity information of the measurement point, measurement value of the detection received from the sensor, sequential measurement values with respect to number of measurement points.
  • the measurement unit may be configured to couple a time stamp for each of the detections received from the sensor.
  • the time difference may be determined based on the time stamps of sequential detections.
  • the time stamp may be received from at least one of the following: a clock in the measurement unit, external clock signal.
  • a method for determining an angular speed of a flywheel of an internal combustion engine comprises steps of monitoring angular motion of the flywheel; detecting, when each of at least two measurement point arranged on the flywheel arrives in a detection space of the sensor during the angular motion of the flywheel; determining points of time of the detections; determining a time difference of a first detection of a measurement point by the sensor and a sequential detection of the same measurement point by the sensor for each of the at least two measurement points; and determining the angular speed of the flywheel in relation to each of the at least two measurement points by dividing 360 degrees with the determined time difference.
  • Fig. 1 illustrates a prior art solution for determining an angular speed of the flywheel of an engine
  • fig. 2 illustrates an example of a system according to the invention
  • fig. 3 illustrates an example of a method according to the invention.
  • the inventive idea according to the present invention lies in a novel way of arranging the measurement of angular speed of the flywheel of an engine, or any similar element representing rotational motion and the operation of the engine.
  • the idea is to establish multiple measurement points in the flywheel of the engine and measure the rotational motion of them, within the operation of the engine.
  • the system according to an example of the invention is illustrated in Fig. 2.
  • the measurement system comprises at least one sensor 203 and a measurement unit 205.
  • the measurement values from the at least one sensor 203 are configured to be read by a processor 207 of the measurement unit 205.
  • the processor is configured to couple a time stamp for each measurement value received from the sensor 203.
  • the time value for the time stamp may be re- ceived from a clock 209 arranged in the measurement unit 205.
  • the measurement values with corresponding time stamp may be stored in a memory 21 1 within the measurement unit 205.
  • the processor 207 may be configured to determine parameters representing the operation of the engine, such as angular speed of the flywheel 101 , without storing any measurement values in the memory 21 1 .
  • the processor 207 may be configured to store the determined parameters representing the opera- tion of the engine to the memory 21 1 .
  • the measurement value is just an indication of a detection, such as a pulse signal.
  • the processor 207 as described may comprise a buffer memory into which the measurement values from the sensor 203 are configured to be read and stored at least temporarily.
  • the measurement value according to an example of the invention may comprise information on a detection of predetermined measurement points arranged in the flywheel 101 . In the case of having multiple measurement points 201 A-201 H each of the measurement points may be identified. The identification may be arranged by introducing a marker as an identifier in the measurement point, which is then detected by the sensor.
  • the detection may be based on structural implementation of the flywheel 101 , and especially the holes or teeth when used as measurement points, in such a manner that each measurement point is arranged to produce a different measurement value in the sensor, which meas- urement values are analyzed by the processor 207.
  • the number of measurement points 201 A-201 H may be known in the processor 207 when the processor 207 is executing a computer program code into which the information on the number of measurement points is coded.
  • the number of measurement points may e.g. be a parameter for the computer program code, which is inserted by the operator when installing the measurement system.
  • the processor is configured receive the measurement values from the sensor 203 and on the basis of the information on the number of measurement points 201 A-201 H in the implementation, the processor 207 is arranged to combine the measure- ment values from a certain measurement point 201 A-201 H .
  • the processor 207 is configured to and capable of determining the angular speed for the first measurement point from every second measurement values and for the second measurement point from the other every second measurement values re- ceived from the sensor 203.
  • a counter may be arranged within the measurement unit, e.g. in the processor, which is increased one step each time a detection is done in the sensor. When the counter reaches the maximum value, which equals to the number of measurement points it is restarted. In this manner it is possible to keep on track, which measurement values, such as detection pulses, are from which measurement point.
  • a number of measurement points on the flywheel there can be arranged a number of measurement points on the flywheel.
  • the processor may e.g. be arranged to ignore certain measurement values from the determined measurement points.
  • This kind of adjustable measurement system enables the optimization of computing resources according to need within the measurement unit.
  • the clock 209 is arranged in the measurement unit 205.
  • the clock signal for the creation of the time stamps may be received from an external entity providing clock signal functions.
  • the sensor 203 may be configured to detect the rotation of a flywheel 101 in the engine.
  • the detection may be based on the holes 201 A-201 H or teeth of the flywheel 101 .
  • the detection may be based on any other element than the flywheel 101 as long as the element indicates the operation of the engine as required.
  • a measurement disc may be coupled to a crankshaft of an engine, which thus gives information on the operation of the engine, i.e. speed of the pistons coupled to the crankshaft. Any similar arrangement may be possible.
  • the measurement points such as identifiers, may be directly arranged on the surface of the crankshaft. Such identifiers may be arranged e.g.
  • the sensor 203 is configured to monitor the rotation of the flywheel 101 and each time the measurement point passes the sensor 203 the processor 207 is configured to detect a change in the measurement value received from the sensor 203.
  • the processor 207 is configured to determine the point of time based on information from the clock 209, when it detects the change in the measurement value.
  • the processor 207 determines at least two points of time t1 and t2, when the measurement point has passed the sensor 203, it is arranged to determine the angular speed of the flywheel 101 . The angular speed of the flywheel 101 is then
  • the above described example of the invention is applicable especially in engines in which the revolution speed is not too high.
  • the sample rate shall be adjusted with an assumed nominal angular speed of the engine in order to avoid aliasing of higher frequency components during the measurement.
  • At least two measurement points are arranged in the flywheel, or a similar element representing rotational motion of the engine.
  • higher sample rate can be enabled.
  • the determination of the angular speed is based on holes or teeth in the flywheel, the maximum sample rate can be achieved by arranging the independent measurement for every hole or tooth in the flywheel 101 .
  • the sensor 203 is configured to detect the passings of each of the measure- ment points, i.e. the measurement points arrive in a detection space of the sensor.
  • the determination of the angular speed of each of the measurement points may be based on the knowledge of the number of measurement points or on identification of the measurement point from which the measurement value is received.
  • the identification of the measurement points may be based on an implementation in which each of the measurement points are configured to produce a distinguishable measurement value from each other when detected.
  • the processor 207 is configured to identify the origin of each measurement value, i.e. the measurement point, based on at least one of the mentioned methods.
  • the needed number of samples per a revolution is to be chosen according to need. For example, let's assume that the frequency range of interest in the measured angular speed is from 0 to f rec Hz. According to Nyquist theory the required sample rate for the frequency range is
  • the sample rate at nominal angular speed of the engine is
  • the number of measurement points can be determined at least party based on the frequency on which the measure- ment is configured to be performed.
  • Fig. 3 illustrates an example of a method according to the invention.
  • the angular motion of the target such as a flywheel of an engine, is monitored and measured 301 .
  • the predetermined measurement points are detected 303, when they arrive in the detection space of a sensor.
  • a processor of a measurement unit is configured to determine points of time for each of the mentioned detections 305 and determine an angular speed of the target based on the times of detections.
  • a time difference of a first detection of a measurement point (201 A-201 H) by the sensor (203) and a sequential detection of the same measurement point (201 A-201 H) by the sensor (203) is determined for each of the measurement points 307 and the angular speed for each of the measurement points is determined 309 by calculating it mathematically.
  • the method steps as disclosed are at least partly performed and/or controlled by a processor within the measurement system.
  • the measurement points are arranged on the flywheel in the engine.
  • any other similar element may be used for the similar purpose, such as crankshaft or measurement disk.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

L'invention se rapporte à un système permettant de déterminer la vitesse angulaire d'un volant d'un moteur à combustion interne. Au moins deux points de mesure sont définis sur le volant et une unité de mesure est configurée pour recevoir, en provenance du capteur, des informations concernant des détections lorsque chacun des au moins deux points de mesure arrive dans un espace de détection du capteur, et des points temporels des détections sont déterminés. En outre, on calcule une différence de temps d'une première détection d'un point de mesure et d'une détection séquentielle du même point de mesure pour chacun des au moins deux points de mesure, et la vitesse angulaire du volant par rapport à chacun des au moins deux points de mesure est calculée au moins partiellement au moyen de la différence de temps. De cette manière, les valeurs de vitesse sont toujours déterminées sur la base d'une rotation complète, de sorte que les erreurs causées par un espacement différent ou angulaire des marqueurs peuvent être évités. L'invention se rapporte également à un procédé permettant de déterminer la vitesse angulaire.
EP14739211.2A 2013-06-12 2014-06-12 Détermination de la vitesse angulaire dans un moteur Ceased EP3008472A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20135641 2013-06-12
PCT/FI2014/050475 WO2014199018A1 (fr) 2013-06-12 2014-06-12 Détermination de la vitesse angulaire dans un moteur

Publications (1)

Publication Number Publication Date
EP3008472A1 true EP3008472A1 (fr) 2016-04-20

Family

ID=51178956

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14739211.2A Ceased EP3008472A1 (fr) 2013-06-12 2014-06-12 Détermination de la vitesse angulaire dans un moteur

Country Status (4)

Country Link
EP (1) EP3008472A1 (fr)
KR (1) KR102206697B1 (fr)
CN (1) CN105283768A (fr)
WO (1) WO2014199018A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105203794A (zh) * 2015-09-21 2015-12-30 华自科技股份有限公司 发电机转速测量系统及方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4866269A (en) * 1988-05-19 1989-09-12 General Motors Corporation Optical shaft position and speed sensor
DE10061004A1 (de) * 2000-12-08 2002-06-13 Daimler Chrysler Ag Verfahren zur Ermittlung der Drehzahl einer Welle
US6496786B1 (en) * 1999-09-22 2002-12-17 Papst-Motoren Gmbh & Co. Kg Method and apparatus for measuring a frequency datum
US20040186652A1 (en) * 2003-03-21 2004-09-23 Aft Atlas Fahrzeugtechnik Gmbh Measuring system
US20040251894A1 (en) * 2001-12-08 2004-12-16 Scotson Peter Geoffrey Angular velocity sensor
US20120041711A1 (en) * 2010-08-16 2012-02-16 Invensys Systems Inc. Enhanced Rotation Measurement

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
JP2002112580A (ja) 2000-09-29 2002-04-12 Nissan Motor Co Ltd 回転体の位相検出装置
JP4339347B2 (ja) * 2006-10-30 2009-10-07 本田技研工業株式会社 内燃機関のクランク角速度検出装置
ATE483103T1 (de) 2007-07-25 2010-10-15 Magneti Marelli Spa Methode zum schätzen des kurbelwinkels, bei dem er 50 der im brennraum einer brennkraftmaschine vorhandenen kraftstoffmasse umgesetzt wird.
CN201133824Y (zh) * 2007-12-11 2008-10-15 重庆工学院 激光栅角位移传感器
US8364436B2 (en) * 2009-10-21 2013-01-29 GM Global Technology Operations LLC Systems and methods for measuring vehicle speed
JP5584634B2 (ja) 2011-01-24 2014-09-03 アルプス電気株式会社 角速度検出装置及び角速度のエラー検出方法
CN202630964U (zh) * 2012-07-10 2012-12-26 南京信息工程大学 一种基于霍尔元件的速度里程仪
CN102830247A (zh) * 2012-09-11 2012-12-19 深圳市开立科技有限公司 一种检测旋转部件旋转状态的方法和装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4866269A (en) * 1988-05-19 1989-09-12 General Motors Corporation Optical shaft position and speed sensor
US6496786B1 (en) * 1999-09-22 2002-12-17 Papst-Motoren Gmbh & Co. Kg Method and apparatus for measuring a frequency datum
DE10061004A1 (de) * 2000-12-08 2002-06-13 Daimler Chrysler Ag Verfahren zur Ermittlung der Drehzahl einer Welle
US20040251894A1 (en) * 2001-12-08 2004-12-16 Scotson Peter Geoffrey Angular velocity sensor
US20040186652A1 (en) * 2003-03-21 2004-09-23 Aft Atlas Fahrzeugtechnik Gmbh Measuring system
US20120041711A1 (en) * 2010-08-16 2012-02-16 Invensys Systems Inc. Enhanced Rotation Measurement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2014199018A1 *

Also Published As

Publication number Publication date
KR102206697B1 (ko) 2021-01-25
CN105283768A (zh) 2016-01-27
WO2014199018A1 (fr) 2014-12-18
KR20160019442A (ko) 2016-02-19

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