EP1412707A2 - Procede permettant de compenser l'ecart de mesure d'un capteur de debit d'air - Google Patents

Procede permettant de compenser l'ecart de mesure d'un capteur de debit d'air

Info

Publication number
EP1412707A2
EP1412707A2 EP02758075A EP02758075A EP1412707A2 EP 1412707 A2 EP1412707 A2 EP 1412707A2 EP 02758075 A EP02758075 A EP 02758075A EP 02758075 A EP02758075 A EP 02758075A EP 1412707 A2 EP1412707 A2 EP 1412707A2
Authority
EP
European Patent Office
Prior art keywords
sensor
air
measurement
air mass
characteristic
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.)
Withdrawn
Application number
EP02758075A
Other languages
German (de)
English (en)
Inventor
Thomas Lenzing
Uwe Konzelmann
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 EP1412707A2 publication Critical patent/EP1412707A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/696—Circuits therefor, e.g. constant-current flow meters
    • G01F1/698—Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters
    • G01F1/6983—Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters adapted for burning-off deposits
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
    • F02D41/187—Circuit arrangements for generating control signals by measuring intake air flow using a hot wire flow sensor
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2438—Active learning methods
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2474—Characteristics of sensors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/696—Circuits therefor, e.g. constant-current flow meters
    • G01F1/6965—Circuits therefor, e.g. constant-current flow meters comprising means to store calibration data for flow signal calculation or correction
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/696—Circuits therefor, e.g. constant-current flow meters
    • G01F1/698—Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters
    • G01F1/6986—Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters with pulsed heating, e.g. dynamic methods
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine

Definitions

  • the invention relates to a method for compensating the measurement deviation of an air mass sensor according to the preamble of patent claim 1.
  • Air mass sensors are used to determine the air mass flow in flow channels and are used, for example, in vehicle technology to regulate the metering of combustion air and to be able to set an optimal air / fuel ratio.
  • Air mass sensors include, for example, a measuring resistor that is heated up by a heating resistor and kept at a certain temperature or at a certain resistance value. In the operating state, the measuring resistor has an excess temperature that is far above the medium temperature. If the mass flow flowing through the flow channel changes, the temperature of the measuring resistor changes due to the changed convective heat transfer, which detunes a resistance measuring bridge. As a result, the heating power of the heating resistor changes. The heating power of the heating resistor or the voltage applied to the heating resistor are a measure of the flow mass of the flowing medium.
  • the dirt build-up on the sensor causes a not inconsiderable characteristic drift of the air mass meter over the course of the engine's life, since the convective heat transfer is impaired by the dirt layer. As a result, incorrect measurements occur, which lead to non-ideal operation of the motor when a maximum permissible tolerance limit is exceeded. Soiled air mass meters had to be replaced when this tolerance limit was reached.
  • the basic inventive idea is to apply a defined air blast to the air mass sensor and to evaluate the response time (impulse response). Since the response time from the thermal
  • both the shift in the sensor characteristic and the change in the characteristic gradient are preferably taken into account.
  • calculations are preferably carried out to compensate for the measurement deviation, for example predetermined mass flow values being assigned new measurement values (measurement voltages), or a The corresponding characteristic curve already stored in the system is selected.
  • the deviation of the sensor characteristic of a dirty or aged sensor from that of a new sensor can e.g. determined on the basis of laboratory measurements and the result used to correct the sensor error.
  • the response time is particularly the time that a temperature sensor of the air mass sensor needs to reach a certain temperature after being subjected to an air blast.
  • the response time can also be the time that the output signal of the air mass sensor needs to reach a certain percentage of the full measurement signal after being subjected to an air blast.
  • Air supply measured and used to compensate for the measurement error.
  • the response times of a plurality of sensors of an air mass meter are determined in order to take account of dirt deposits of different thicknesses on the surface of the air mass meter.
  • Results of the response time that differ greatly from one another can be calculated, for example, as an average.
  • the measurement error is preferably corrected using software.
  • a response time of the air mass meter is determined shortly after a motor vehicle is switched off.
  • the engine is briefly started up from a low speed, such as 500 rpm.
  • a correction calculation for the offset and the amplification of the characteristic curve is then carried out from the result of this measurement, or a characteristic curve already stored in the system is selected.
  • the correction is finally taken into account when evaluating the air mass sensor output signal after the vehicle is restarted.
  • Figure 1 shows an embodiment of an air mass sensor
  • Figure 2 shows the change in the sensor characteristic due to contamination or aging.
  • Figure 1 shows a possible implementation of a
  • Air mass sensor 1 which is arranged on a carrier plate 2.
  • the air mass sensor 1 consists of a me branch-like heating area 3, on which several resistors 5,6,7 are arranged, and a thicker edge area 4th
  • the resistors 5,6,7 are part of a measuring bridge circuit which is tuned in the normal state.
  • the resistor 6 is a measuring resistor that is heated by the heating area 3 underneath and is kept at a certain temperature or at a certain resistance value.
  • Air mass sensor 1 and cools the heating area of the sensor depending on the flow rate and the air temperature. If the flow rate now changes, the temperature of the changes due to the changed convective heat transfer
  • Measuring resistor 6 whereby the measuring bridge circuit is detuned. This leads to an increased heating of the measuring resistor 6.
  • the heating power or the voltage applied to the heating element is a measure of the mass flow of the flowing medium.
  • a temperature sensor 8 is provided on the outer edge region of the sensor 1.
  • the reference number 9 denotes a layer of dirt which has deposited on the surface of the air mass sensor during operation and which causes a not inconsiderable characteristic drift of the air mass meter 1. This layer of dirt affects the convective
  • FIG. 2 shows an output characteristic curve 10 of an air mass sensor 1 when new compared to a characteristic curve 11 of the sensor covered with a layer of dirt.
  • the dirt application on the sensor causes a characteristic drift, which can lead to incorrect measurements. More specifically, the pollution causes both a shift in the characteristic curve (offset) and a reduction the reinforcement, so that the characteristic curve 11 of the dirty air mass meter is generally below that of a new air mass meter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Measuring Volume Flow (AREA)
  • Details Of Flowmeters (AREA)

Abstract

Procédé permettant de compenser l'écart de mesure d'un capteur de débit d'air, provoqué par les salissures ou le vieillissement, qui est placé dans un canal d'écoulement. Selon la présente invention, pour compenser les erreurs de mesure, ledit capteur est soumis à un souffle d'air et le temps de réponse du capteur est évalué. Les erreurs de mesure provoquées par le dépôt de saleté ou par le vieillissement sont ensuite corrigées en fonction du temps de réponse.
EP02758075A 2001-07-11 2002-07-05 Procede permettant de compenser l'ecart de mesure d'un capteur de debit d'air Withdrawn EP1412707A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10133526A DE10133526A1 (de) 2001-07-11 2001-07-11 Verfahren zur Kompensation der Messabweichung eines Luftmassensensors
DE10133526 2001-07-11
PCT/DE2002/002464 WO2003006931A2 (fr) 2001-07-11 2002-07-05 Procede permettant de compenser l'ecart de mesure d'un capteur de debit d'air

Publications (1)

Publication Number Publication Date
EP1412707A2 true EP1412707A2 (fr) 2004-04-28

Family

ID=7691305

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02758075A Withdrawn EP1412707A2 (fr) 2001-07-11 2002-07-05 Procede permettant de compenser l'ecart de mesure d'un capteur de debit d'air

Country Status (5)

Country Link
US (1) US20040244461A1 (fr)
EP (1) EP1412707A2 (fr)
JP (1) JP2004534248A (fr)
DE (1) DE10133526A1 (fr)
WO (1) WO2003006931A2 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10316294B4 (de) * 2003-04-09 2006-06-14 Siemens Ag Verfahren zur Steuerung/Regelung einer Klimaanlage für ein Kraftfahrzeug
DE10320365B4 (de) * 2003-05-07 2005-10-27 Maschinenfabrik Georg Kiefer Gmbh Kühldecke bzw. Kühlsegel mit Speicherfähigkeit
DE102004024536A1 (de) * 2004-05-18 2005-12-15 Robert Bosch Gmbh Verfahren zum Betrieb eines Systems
FR2885216B1 (fr) * 2005-05-02 2007-07-27 Peugeot Citroen Automobiles Sa Systeme de determination de l'etat d'encrassement d'un debitmetre impulsionnel pour vehicule automobile
DE102005025884A1 (de) * 2005-06-06 2006-12-07 Robert Bosch Gmbh Verfahren und Vorrichtung zur Korrektur eines Signals eines Sensors
DE102005057687A1 (de) * 2005-12-01 2007-06-06 Endress + Hauser Flowtec Ag Vorrichtung zur Bestimmung und/oder Überwachung des Massedurchflusses eines fluiden Mediums
DE102006010710B4 (de) * 2006-03-08 2009-03-19 Audi Ag Verfahren zur Luftmassenermittlung bei Brennkraftmaschinen
DE102006029215A1 (de) * 2006-06-26 2008-01-03 Robert Bosch Gmbh Messvorrichtung zur Messung der Durchflußrate eines Verbrennungsgas-Gemisches, aufweisend eine Korrektureinrichtung
CN102317258B (zh) * 2009-02-20 2014-06-04 三亚普罗股份有限公司 锍盐、光酸产生剂及光敏性树脂组合物
JP6020061B2 (ja) * 2012-11-12 2016-11-02 トヨタ自動車株式会社 内燃機関の制御装置
DE102016202803B3 (de) * 2016-02-24 2017-08-17 Continental Automotive Gmbh Verfahren zum Ermitteln einer Luftmasse in einer Brennkraftmaschine
CN105823502B (zh) * 2016-03-14 2018-06-19 深圳怡化电脑股份有限公司 一种传感器老化补偿电路及其方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4004552C2 (de) * 1989-02-14 1994-07-07 Mitsubishi Electric Corp Signalverarbeitungsverfahren für einen thermischen Durchflußsensor
DE3910676C2 (de) * 1989-04-03 1999-03-04 Pierburg Ag Luftmassenstrom-Meßeinrichtung
US5235527A (en) * 1990-02-09 1993-08-10 Toyota Jidosha Kabushiki Kaisha Method for diagnosing abnormality of sensor
DE4231831A1 (de) * 1992-09-23 1994-03-24 Pierburg Gmbh Steuer- und Auswerteschaltung für einen Luftmassenstromsensor
AU3786697A (en) * 1997-07-29 1999-02-22 Gascontrol B.V. Gasmeter
DE10000496A1 (de) * 2000-01-08 2001-07-12 Bosch Gmbh Robert Gasströmungs-Bestimmungsverfahren und -vorrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03006931A2 *

Also Published As

Publication number Publication date
WO2003006931A3 (fr) 2003-05-30
WO2003006931A2 (fr) 2003-01-23
JP2004534248A (ja) 2004-11-11
DE10133526A1 (de) 2003-01-30
US20040244461A1 (en) 2004-12-09

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