EP2104784A2 - Procédé pour déterminer une valeur de vitesse de rotation - Google Patents

Procédé pour déterminer une valeur de vitesse de rotation

Info

Publication number
EP2104784A2
EP2104784A2 EP07822440A EP07822440A EP2104784A2 EP 2104784 A2 EP2104784 A2 EP 2104784A2 EP 07822440 A EP07822440 A EP 07822440A EP 07822440 A EP07822440 A EP 07822440A EP 2104784 A2 EP2104784 A2 EP 2104784A2
Authority
EP
European Patent Office
Prior art keywords
signal
internal combustion
speed
combustion engine
crankshaft
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
EP07822440A
Other languages
German (de)
English (en)
Inventor
Joerg Breuninger
Haris Hamedovic
Franz Raichle
Wolfgang Fischer
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2104784A2 publication Critical patent/EP2104784A2/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/24471—Error correction
    • G01D5/2449—Error correction using hard-stored calibration data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0097—Electrical control of supply of combustible mixture or its constituents using means for generating speed signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
    • G01D18/001—Calibrating encoders
    • 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
    • G01M15/11—Testing internal-combustion engines by detecting misfire
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1006—Engine torque losses, e.g. friction or pumping losses or losses caused by external loads of accessories

Definitions

  • the present invention relates to a device, a computer program and a method for determining a rotational speed value of a torque representing a torque of a shaft signal, in particular a signal of a transmitter wheel of a crankshaft of an internal combustion engine associated transmitter.
  • the speed signal provides information of central importance for engine control, diagnosis and optimization of the operating behavior with regard to a wide variety of criteria.
  • the speed signal is typically measured by means of a donor wheel mounted on the crankshaft, which has a certain number of markings by alternately attaching teeth and tooth gaps and usually a Geberradlücke.
  • the individual markings are detected by means of a sensor, so that angle increments and a zero position of the crankshaft identified by a transmitter wheel gap or the like can be detected.
  • By measuring the elapsed time between two successive markings one obtains the so-called tooth sides, which are converted into corresponding speed values.
  • Fluctuations in the speed signal are primarily due to two factors, namely the gas torque resulting from compression and combustion and the oscillating masses of an internal combustion engine.
  • the oscillating masses of an internal combustion engine are in particular the pistons, piston pins, piston ring packages and the oscillating portion of the connecting rods. Their influence on the angular acceleration depends quadratically on the speed.
  • a speed signal u.a. Information about combustion characteristics of the
  • An object of the present invention is to compensate for the influence of oscillating masses directly on the speed signal.
  • the correction function can be any function with which the speed signal is converted.
  • the signal is determined from an angle-discrete encoder signal and the correction function is angularly discrete, wherein the discretization of the speed signal in the correction function is the same.
  • angle discrete is understood in this context that both the
  • Speed signal and the correction function to discrete crankshaft angles are present.
  • the discretization can also be, for example, an interpolation to crankshaft angles at which there is no signal of a speed sensor exist.
  • the correction function is preferably determined by a simulation of the oscillating masses of the internal combustion engine and stored in the form of a series of numbers in a control unit of the internal combustion engine. As a result, it is not necessary to determine the correction terms online during operation. It is preferably provided that the correction function is a multiplication with a discrete angle-dependent correction factor. The respective speed value or value of the angular speed to a discrete crankshaft angle is thus determined with a constant and from the operating point of the internal combustion engine multiplied independent correction factor.
  • the correction factor is stored as an angle-dependent series in a memory of a control unit.
  • a gas torque of the internal combustion engine is determined from the transformed speed signal. Since the speed signal is compensated for the influence of the oscillating masses, the rotational inertia of the crankshaft is no longer dependent on the crankshaft angle but constant. As a result, the gas torque can be determined directly from the speed signal. If the transformed speed signal is transmitted via e.g. integrated compression torque curve determined from an adiabatic model of the internal combustion engine, in addition, the influence of the compression can be eliminated, so that only the proportion of the torque resulting from the combustion during the power stroke, can be determined.
  • control unit or internal combustion engine which is set up to carry out a method according to the invention and a computer program with program code for carrying out all steps according to a method according to the invention, when the program is executed in a computer.
  • FIG. 1 is a block diagram of a method according to the invention.
  • FIG. 2 is a graph of a correction value over the crankshaft angle
  • Fig. 3 is a diagram of a speed signal and a corrected by the correction value of Fig. 2 speed signal.
  • an instantaneous speed of a crankshaft of an internal combustion engine is present as a time series at discrete crankshaft angles.
  • the speed signal is determined by an inductive sensor, for example, which cooperates with a fixedly mounted on the crankshaft sensor wheel.
  • the sender wheel has markings in the form of a sequence of teeth and tooth gaps, wherein the tooth pitch is usually 6 °, the distance between two similarly oriented tooth flanks is therefore 6 ° over the circumferential angle of the encoder disc.
  • the electrical signal of the encoder which is transmitted to the control unit, is a rectangular signal representing the geometric course of teeth and tooth spaces on the circumference of the sensor wheel. From the signal of the encoder, an instantaneous speed or a momentary angular speed of the crankshaft to the crankshaft angles, which are associated with a rising or falling edge of the electrical signal of the encoder, can be determined. The speed signal is thus available as an angle-discrete row at defined crankshaft angles.
  • the angle-discrete signal of the encoder assigned to the sender wheel of the crankshaft of the internal combustion engine is now corrected for the influence of oscillating masses of the crankshaft by multiplying the angle-discrete signal by an angle-dependent correction value K.
  • Oscillating masses of the crankshaft are the pistons of the engine and proportionally the connecting rods between the crankshaft and the piston.
  • the correction value K is determined as angle-dependent to the crankshaft angles, to each of which an instantaneous speed is present, these are in customary in the prior art combinations of encoder wheel and encoder and subsequent signal evaluation of one of the tooth flanks of the encoder wheel associated crankshaft angle, so for example crankshaft angle of 3, 9, 15, 21, etc., crankshaft.
  • the correction value K is calculated offline using a model of the internal combustion engine, which takes into account internal combustion engine parameters such as oscillating and rotating mass fractions and the engine geometry, and stored in a memory of a control unit of the internal combustion engine.
  • Fig. 2 shows at the block diagram of the method for correcting the measured speed values ⁇ meM ( ⁇ ; ).
  • a first step 1 an instantaneous value to a crankshaft angle Cp 1 of the measured value of the angular velocity ⁇ mess ( ⁇ ; ) is determined.
  • the correction value K (Cp 1 ) is determined for the crankshaft angle ⁇ i for which the measured angular velocity ⁇ mess ( ⁇ ; ) is present.
  • Values K (Cp 1 ) are stored in a memory of the control unit so that they only have to be read out and not have to be calculated online.
  • FIG. 2 shows an exemplary embodiment of the values of the correction factor K via the crankshaft angle ⁇ .
  • the correction values K (Cp 1 ) are present at discrete interpolation points which are assigned to the tooth sides of the transmitter wheel, but can also be present at intermediate values, the rotational speed or angular velocity values being interpolated between the crankshaft angles ⁇ determined by the tooth pitch.
  • a correction value of 1 means that the measured speed signal (p mess ( ⁇ ; ) is multiplied by the factor 1, ie remains unchanged.
  • Fig. 3 shows as a dashed curve the measured value of the angular velocity ⁇ mess ( ⁇ j and as a solid curve the corrected value of the angular velocity
  • An index of 40 thus means here a crankshaft angle of cp 0 + 40 x 6 °, with a cp 0 of 3 ° as in the previously mentioned example of 3 °, 9 °, etc., the index 40 thus corresponds to a crankshaft angle of 243 °.
  • the measured speed value deviates from the corrected speed value.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

Procédé pour déterminer une valeur de vitesse de rotation d'un signal représentant une vitesse de rotation momentanée d'un arbre, notamment d'un signal d'un détecteur associé à une roue de détection d'un vilebrequin d'un moteur à combustion interne. On applique au signal une fonction de correction qui compense au moins partiellement l'influence des masses oscillantes.
EP07822440A 2006-12-27 2007-11-09 Procédé pour déterminer une valeur de vitesse de rotation Ceased EP2104784A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006061579A DE102006061579A1 (de) 2006-12-27 2006-12-27 Verfahren zur Bestimmung eines Drehzahlwertes
PCT/EP2007/062151 WO2008080679A2 (fr) 2006-12-27 2007-11-09 Procédé pour déterminer une valeur de vitesse de rotation

Publications (1)

Publication Number Publication Date
EP2104784A2 true EP2104784A2 (fr) 2009-09-30

Family

ID=39393387

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07822440A Ceased EP2104784A2 (fr) 2006-12-27 2007-11-09 Procédé pour déterminer une valeur de vitesse de rotation

Country Status (3)

Country Link
EP (1) EP2104784A2 (fr)
DE (1) DE102006061579A1 (fr)
WO (1) WO2008080679A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009001905A1 (de) 2009-03-26 2010-09-30 Robert Bosch Gmbh Verfahren zur Bestimmung von kurbelwinkelabhängigen Einflüssen auf ein Drehzahlsignal einer Brennkraftmaschine
DE102010001257A1 (de) 2010-01-27 2011-07-28 Robert Bosch GmbH, 70469 Verfahren und Steuervorrichtung zur Bestimmung einer zukünftigen Drehzahl

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4445684C2 (de) 1994-12-21 2000-06-21 Fraunhofer Ges Forschung Verfahren zur Ermittlung von Drehmomenten, Arbeiten und Leistungen an Verbrennungskraftmaschinen
DE69625451T2 (de) * 1995-06-08 2004-03-11 Renault S.A.S. Verfahren und vorrichtung zum messen des drehmomentes eines thermischen internen verbrennungsmotors
DE19540674C2 (de) * 1995-10-31 1999-01-28 Siemens Ag Adaptionsverfahren zur Korrektur von Toleranzen eines Geberrades
DE19941171B4 (de) 1999-08-30 2006-12-14 Robert Bosch Gmbh Verfahren zum Bestimmen des von einer Brennkraftmaschine aufgebrachten Moments
DE19941172C2 (de) * 1999-08-30 2001-06-07 Bosch Gmbh Robert Verfahren zum Bestimmen des von einer Brennkraftmaschine aufgebrachten Ist-Moments
DE10123022B4 (de) * 2001-05-11 2005-06-23 Siemens Ag Drehzahlerfassungsverfahren

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008080679A2 *

Also Published As

Publication number Publication date
WO2008080679A3 (fr) 2009-01-15
DE102006061579A1 (de) 2008-07-03
WO2008080679A2 (fr) 2008-07-10

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