EP1356198A1 - Method and device for determining the throughput of a flowing medium - Google Patents

Method and device for determining the throughput of a flowing medium

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Publication number
EP1356198A1
EP1356198A1 EP01271494A EP01271494A EP1356198A1 EP 1356198 A1 EP1356198 A1 EP 1356198A1 EP 01271494 A EP01271494 A EP 01271494A EP 01271494 A EP01271494 A EP 01271494A EP 1356198 A1 EP1356198 A1 EP 1356198A1
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EP
European Patent Office
Prior art keywords
air mass
throughput
flowing medium
determining
temperature
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
Application number
EP01271494A
Other languages
German (de)
French (fr)
Other versions
EP1356198B1 (en
Inventor
Dieter Tank
Josef Kleinhans
Wolfgang Kienzle
Hans Hecht
Manfred Strohrmann
Wolfgang-Michael Mueller
Axel-Werner Haag
Uwe Konzelmann
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1356198A1 publication Critical patent/EP1356198A1/en
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Publication of EP1356198B1 publication Critical patent/EP1356198B1/en
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Classifications

    • 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
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
    • F02D41/182—Circuit arrangements for generating control signals by measuring intake air flow for the control of a fuel injection device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2400/00—Control systems adapted for specific engine types; Special features of engine control systems not otherwise provided for; Power supply, connectors or cabling for engine control systems
    • F02D2400/08—Redundant elements, e.g. two sensors for measuring the same parameter

Definitions

  • the invention relates to a method and a device for determining the throughput of a flowing medium, in particular for determining the air flow prevailing in the intake manifold of an internal combustion engine and thus for determining the intake air mass.
  • Hot film air mass meters are usually used to record the air mass sucked in by an internal combustion engine. These have a heatable element which is exposed to the air flow to be measured and is cooled by it.
  • Both types of air mass meter, or an existing method for detecting the air mass flow with a hot film air mass meter is based on the measurement of the heat that is given off to the air mass flow flowing past. For this purpose, the electrical energy required to regulate the hot film to a constant temperature is measured in a type of air mass meter.
  • a second method, or a second associated one Sensor arrangement is based on the fact that the hot film is also regulated to a constant temperature.
  • the heating power required is not used as the measurement signal, but rather the temperature profile at the edge of the hot film formed as a membrane.
  • the temperature difference between these two points is determined using an upstream and a downstream temperature sensor. Both temperature sensors, which are designed as temperature-dependent resistors, are part of a bridge circuit. A measuring signal is obtained from the resulting bridge voltage, which represents the temperature difference between the upstream and the downstream temperature-dependent resistance.
  • Both types of sensors, or evaluation methods can be impaired by interference effects, such as air humidity or pollution. This can lead to a false display of such a sensor or an error in the signal evaluation.
  • the object of the invention is to minimize the sources of error mentioned and the resulting false indications.
  • the object is achieved with a method and / or a device according to the invention for determining the throughput of a flowing medium with the features of claim 1.
  • the method according to the invention and / or the device according to the invention for determining the throughput of a flowing medium, in particular that of an internal combustion engine sucked air mass has the advantage that interference effects are compensated for during the measurement.
  • This is advantageously carried out by carrying out a redundant measurement which works according to two different methods, which are carried out with a single sensor, or there are two different types of sensors for measuring the air mass, it being essential that the two selected methods or the two sensors react differently to interference effects.
  • the combination of the two measurement results can then be used to compensate for interference effects which occur more in one method or the associated sensor than in the other method or in the other sensor.
  • DE-OS 39 25 377 proposes a method for correcting measurement errors, in which the measurement error of a hot-film air mass meter that occurs due to backflow is compensated.
  • the air mass is recorded with the hot-film air mass meter as a first value and the air mass is calculated as a second value according to a method that works independently thereof, by evaluating the throttle valve angle and the speed of the internal combustion engine.
  • Which value is used to actually determine the air mass depends on the operating range in which the internal combustion engine is located. Since the two values have different safeties in different operating ranges of the internal combustion engine, a correction signal can be obtained from the comparison of the two measured variables, which is taken into account to increase the measuring certainty.
  • the air mass flow LS to be measured is determined according to two different methods, both of which work with the same sensor 13, which comprises a heatable hot film.
  • the sensor 13 is constructed in such a way that it is suitable for both measuring methods and is exposed to the flowing air mass flow LS which cools it.
  • the evaluation process which takes place in block 10, represents a first type of evaluation process and is based on the measurement of the heat that is emitted to the air mass flow flowing past the sensor.
  • the heat which is given off to the air mass flow flowing past is determined by measuring the electrical energy which is required to regulate the hot film to a constant temperature. Ultimately, the heating output is measured and the air mass flow is determined from it.
  • the second type of detection of the air mass flow or the second evaluation process takes place in block 12 and is carried out by evaluating the temperature profile.
  • the hot film of the sensor 13 is also regulated to a constant temperature. However, the required signal is not used Heating power used, but the temperature profile at the membrane edge of the hot film air mass meter is determined.
  • the air mass meter must therefore have at least two temperature-dependent resistors in addition to the hot film and the heating resistor. In the case of such a hot film air mass meter, for example, the temperature difference between an upstream and a downstream temperature-dependent resistor, which serves as a temperature sensor, is evaluated.
  • the two output signals S1 and S2 emitted by blocks 10 and 11 are fed to a common evaluation device 12.
  • the evaluation of the two signals S1 and S2 obtained by different methods takes place in this evaluation device 12, and the interference effects are compensated for.
  • the output signal of the evaluation device 12 is then fed as a corrected measurement signal KM for further processing.
  • This further processing can take place, for example, in the control unit of an internal combustion engine, which uses the measurement signal, which then specifies the air mass actually flowing in the intake manifold of an internal combustion engine, to calculate the control signals required for regulating the internal combustion engine.
  • the arrangement shown in the figure represents a hot film air mass meter, in which a sensor is present which can be operated in two different methods, or in which the air mass is determined by two different methods.
  • a sensor which can be operated in two different methods, or in which the air mass is determined by two different methods.
  • Such an arrangement enables the air mass flow to be recorded redundantly by measuring the heating power and by evaluating the temperature profile. Since the two measuring methods react differently to interference effects, the type and magnitude of the two can be compared from the two sensor signals Interference effects are closed, and the interference effects determined in this way can be taken into account in the further signal evaluation and thus compensated for.
  • HFM 2 hot film air mass meter
  • HFM5 Hot film air mass meter
  • Evaluation methods of a first type and evaluation methods of a second type are then carried out again and the measurement results are combined with one another, however for two sensors or sensor elements.
  • the invention has been explained for the determination of a flowing air mass, but it can basically be used wherever a flowing medium influences a heatable measuring element.

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

Abstract

The invention relates to methods and/or devices for determining the throughput of a flowing medium, in particular a flowing air mass. According to the invention, the flowing medium is determined using two evaluation methods that function according to different principles and the two measurement signals thus obtained are correlated to determine corrective procedures. As the two measurement methods react differently to disturbances, the type and order of magnitude of the disturbance can be deduced from the comparison of the two output signals and a corrected measurement signal, which is independent of the disturbances, can be obtained.

Description

Verfahren und Vorrichtung zur Ermittlung des Durchsatzes eines strömenden MediumsMethod and device for determining the throughput of a flowing medium
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Ermittlung des Durchsatzes eines strömenden Mediums, insbesonders zur Ermittlung der im Saugrohr einer Brennkraftmaschine herrschenden Luftströmung und damit zur Bestimmung der angesaugten Luftmasse.The invention relates to a method and a device for determining the throughput of a flowing medium, in particular for determining the air flow prevailing in the intake manifold of an internal combustion engine and thus for determining the intake air mass.
Stand der TechnikState of the art
Zur Erfassung der von einer Brennkraftmaschine angesaugten Luftmasse werden üblicherweise Heißfilm-Luftmassenmesser eingesetzt. Diese weisen ein beheizbares Element auf, das dem zu messenden Luftstrom ausgesetzt wird und durch diesen gekühlt wird. Für die Ausgestaltung des Heißfilm- Luftmassenmessers gibt es verschiedene Möglichkeiten, ebenso für die Heizungsregelung und die Auswerteverfahren. Beide Arten von Luftmassenmessern, bzw. ein existierendes Verfahren zur Erfassung des Luftmassenstromes mit einem Heißfilm-Luftmassenmesser, beruht auf der Messung der Wärme, die an den vorbeiströmenden Luftmassenstrom abgegeben wird. Dazu wird bei einer Art von Luftmassenmessern die elektrische Energie, die zur Regelung des Heißfilmes auf eine konstante Temperatur benötigt wird, gemessen. Ein zweites Verfahren, bzw. eine zweite zugehörige Sensoranordnung, beruht darauf, daß der Heißfilm ebenfalls auf eine konstante Temperatur geregelt wird. Als Meßsignal wird jedoch nicht die dazu benötigte Heizleistung verwendet, sondern das Temperaturprofil am Rand des als Membran ausgebildeten Heißfilms. Dabei wird mit Hilfe eines stromaufwärts und eines stromabwärts vom Heizbereich liegenden Temperatursensors die Temperaturdifferenz zwischen diesen beiden Stellen bestimmt. Beide Temperatursensoren, die als temperaturabhängige Widerstände ausgebildet sind, sind Bestandteil einer Brückenschaltung. Aus der sich einstellenden Brückenspannung wird ein Meßsignal gewonnen, das die Temperaturdifferenz zwischen dem stromaufwärts und dem stromabwärts vom Heizbereich liegenden temperaturabhängigen Widerstand repräsentiert.Hot film air mass meters are usually used to record the air mass sucked in by an internal combustion engine. These have a heatable element which is exposed to the air flow to be measured and is cooled by it. There are various options for designing the hot-film air mass meter, as well as for heating control and evaluation methods. Both types of air mass meter, or an existing method for detecting the air mass flow with a hot film air mass meter, is based on the measurement of the heat that is given off to the air mass flow flowing past. For this purpose, the electrical energy required to regulate the hot film to a constant temperature is measured in a type of air mass meter. A second method, or a second associated one Sensor arrangement, is based on the fact that the hot film is also regulated to a constant temperature. However, the heating power required is not used as the measurement signal, but rather the temperature profile at the edge of the hot film formed as a membrane. The temperature difference between these two points is determined using an upstream and a downstream temperature sensor. Both temperature sensors, which are designed as temperature-dependent resistors, are part of a bridge circuit. A measuring signal is obtained from the resulting bridge voltage, which represents the temperature difference between the upstream and the downstream temperature-dependent resistance.
Beide Arten von Sensoren, bzw. Auswerteverfahren, können durch Störeffekte, wie beispielsweise Luftfeuchtigkeit oder Verschmutzung, beeinträchtigt werden. Dies kann zu einer Fehlanzeige eines solchen Sensors führen, bzw. zu einem Fehler in der Signalauswertung.Both types of sensors, or evaluation methods, can be impaired by interference effects, such as air humidity or pollution. This can lead to a false display of such a sensor or an error in the signal evaluation.
Aufgabe der ErfindungObject of the invention
Die Aufgabe der Erfindung besteht darin, die angesprochenen Fehlerquellen und die daraus resultierenden Fehlanzeigen zu minimieren. Die Lösung der Aufgabe wird mit einem erfindungsgemäßen Verfahren und/oder einer erfindungsgemäßen Vorrichtung zur Ermittlung des Durchsatzes eines strömenden Mediums mit den Merkmalen des Anspruchs 1 erzielt.The object of the invention is to minimize the sources of error mentioned and the resulting false indications. The object is achieved with a method and / or a device according to the invention for determining the throughput of a flowing medium with the features of claim 1.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Verfahren und/oder die erfindungsgemäße Vorrichtung zur Ermittlung des Durchsatzes eines strömenden Mediums, insbesonders der von einer Brennkraftmaschine angesaugten Luftmasse, hat den Vorteil, daß Störeffekte bei der Messung kompensiert werden. In vorteilhafter Weise erfolgt dies, indem eine redundante Messung durchgeführt wird, die nach zwei verschiedenen Verfahren arbeitet, die bei einem einzigen Sensor durchgeführt werden oder es sind zwei verschiedenartige Sensoren zur Messung der Luftmasse vorhanden, wobei wesentlich ist, dass die beiden ausgewählten Verfahren bzw. die beiden Sensoren unterschiedlich auf Störeffekte reagieren. Durch Kombination der beiden Meßergebnisse lassen sich dann Störeffekte, die bei einem Verfahren, bzw. dem zugehörigen Sensor, stärker auftreten als beim anderen Verfahren, bzw. beim anderen Sensor, kompensieren. Erzielt werden diese Vorteile dabei durch ein Verfahren und/oder eine Vorrichtung mit den Merkmalen des Anspruchs 1.The method according to the invention and / or the device according to the invention for determining the throughput of a flowing medium, in particular that of an internal combustion engine sucked air mass has the advantage that interference effects are compensated for during the measurement. This is advantageously carried out by carrying out a redundant measurement which works according to two different methods, which are carried out with a single sensor, or there are two different types of sensors for measuring the air mass, it being essential that the two selected methods or the two sensors react differently to interference effects. The combination of the two measurement results can then be used to compensate for interference effects which occur more in one method or the associated sensor than in the other method or in the other sensor. These advantages are achieved by a method and / or a device with the features of claim 1.
Weitere Vorteile der Erfindung werden durch die in den Unteransprüchen angegebenen Maßnahmen erzielt.Further advantages of the invention are achieved by the measures specified in the subclaims.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der einzigen Figur dargestellt und wird in der nachfolgenden Beschreibung näher erläutert.An embodiment of the invention is shown in the single figure and is explained in more detail in the following description.
Beschreibungdescription
Bei der Ermittlung des Durchsatzes eines strömenden Mediums besteht die Gefahr, daß die Genauigkeit durch Störeffekte beeinträchtigt wird. Insbesonders im Zusammenhang mit der Erfassung der im Saugrohr einer Brennkraftmaschine strömenden Luftmasse gibt es verschiedene Probleme, die beispielsweise dadurch verursacht werden, daß die Feuchtigkeit der strömenden Luft nicht genau bekannt ist oder daß die Sensorelemente bei andauerndem Gebrauch verschmutzt werden, wodurch sich Fehler in der Auswertung einstellen können. Eine weitere Problematik bei der Messung der im Saugrohr einer Brennkraftmaschine strömenden Luft wird verursacht durch die Tatsache, daß die Strömung nicht immer in eine Richtung erfolgt, sondern eine sogenannte Strömungsumkehr, bzw. eine Pulsation, auftreten kann. Zur Kompensation von Fehlern und insbesonders zur Kompensation der Störeffekte, die durch solche Saugrohrpulsationen verursacht werden, ist es bekannt, die Ermittlung der strömenden Luftmasse nach zwei unterschiedlichen Verfahren durchzuführen und die erhaltenen Meßergebnisse miteinander zu kombinieren, um damit Fehlmessungen zu minimieren.When determining the throughput of a flowing medium, there is a risk that the accuracy will be affected by interference. In particular in connection with the detection of the air mass flowing in the intake manifold of an internal combustion engine, there are various problems which are caused, for example, by the fact that the humidity of the flowing air is not exactly known or that the sensor elements are in continuous use become dirty, which can result in errors in the evaluation. Another problem with the measurement of the air flowing in the intake manifold of an internal combustion engine is caused by the fact that the flow does not always take place in one direction, but a so-called flow reversal or pulsation can occur. To compensate for errors and in particular to compensate for the interference effects caused by such intake manifold pulsations, it is known to carry out the determination of the flowing air mass according to two different methods and to combine the measurement results obtained with one another in order to minimize incorrect measurements.
Dazu wird beispielsweise in der DE-OS 39 25 377 ein Verfahren zur Meßfehlerkorrektur vorgeschlagen, bei dem der durch Rückströmung auftretende Meßfehler eines Heißfilm- Luftmassenmessers kompensiert wird. Dazu wird die Luftmasse mit dem Heißfilm-Luftmassenmesser als ein erster Wert erfaßt und als zweiter Wert wird nach einem davon unabhängig arbeitenden Verfahren die Luftmasse berechnet, indem der Drosselklappenwinkel und die Drehzahl der Brennkraftmaschine ausgewertet werden. Welcher Wert zur tatsächlichen Bestimmung der Luftmasse verwendet wird, hängt davon ab, in welchem Betriebsbereich sich die Brennkraftmaschine befindet. Da die beiden Werte in verschiedenen Betriebsbereichen der Brennkraftmaschine unterschiedliche Sicherheiten aufweisen, kann aus dem Vergleich der beiden Meßgrößen ein Korrektursignal gewonnen werden, das zur Erhöhung der Meßsicherheit berücksichtigt wird.For this purpose, for example, DE-OS 39 25 377 proposes a method for correcting measurement errors, in which the measurement error of a hot-film air mass meter that occurs due to backflow is compensated. For this purpose, the air mass is recorded with the hot-film air mass meter as a first value and the air mass is calculated as a second value according to a method that works independently thereof, by evaluating the throttle valve angle and the speed of the internal combustion engine. Which value is used to actually determine the air mass depends on the operating range in which the internal combustion engine is located. Since the two values have different safeties in different operating ranges of the internal combustion engine, a correction signal can be obtained from the comparison of the two measured variables, which is taken into account to increase the measuring certainty.
Bei diesem bekannten Verfahren wird jedoch nur der durch die Rückströmung verursachte Meßfehler kompensiert, andere Meßfehler werden dagegen nicht berücksichtigt. Beim bekannten Verfahren wird im übrigen auch nur ein Luftmassensensor eingesetzt, die zweiten Informationen, die zur Berechnung der Luftmasse benötigt werden, werden nicht direkt gemessen, sondern berechnet, sie lassen sich nicht zur erfindungsgemäßen Korrektur bzw. Kompensation von allgemeinen, verschiedenartigen Meßfehlern heranziehen.In this known method, however, only the measurement error caused by the backflow is compensated, other measurement errors are not taken into account. In the known method, only one air mass sensor is used, the second information that to calculate the air mass are not measured directly, but calculated, they cannot be used for the correction or compensation of general, different types of measurement errors according to the invention.
Bei dem erfindungsgemäßen Verfahren, bzw. der zugehörigen Vorrichtung, die in der Figur dargestellt ist, können verschiedene Meßfehler kompensiert werden und somit eine sehr zuverlässige und genaue Erfassung des Durchsatzes eines strömenden Mediums, beispielsweise der von einer Brennkraftmaschine angesaugten Luftmasse, erhalten werden. Dazu wird bei dem in Figur 1 als Blockanordnung dargestellten Ausführungsbeispiel der zu messende Luftmassenstrom LS nach zwei unterschiedlichen Verfahren bestimmt, die beide mit dem selben Sensor 13, der einen beheizbaren Heißfilm umfaßt, arbeiten. Der Sensor 13 ist dabei so aufgebaut ist, dass er für beide Meßverfahren geeignet ist und dem strömenden Luftmassenstrom LS ausgesetzt wird, der ihn kühlt.In the method according to the invention, or the associated device, which is shown in the figure, various measurement errors can be compensated and thus a very reliable and accurate detection of the throughput of a flowing medium, for example the air mass sucked in by an internal combustion engine, can be obtained. For this purpose, in the exemplary embodiment shown as a block arrangement in FIG. 1, the air mass flow LS to be measured is determined according to two different methods, both of which work with the same sensor 13, which comprises a heatable hot film. The sensor 13 is constructed in such a way that it is suitable for both measuring methods and is exposed to the flowing air mass flow LS which cools it.
Das Auswerteverfahren, das in Block 10 abläuft, stellt eine erste Art von Auswerteverfahren dar und beruht auf der Messung der Wärme, die an den am Sensor vorbeiströmenden Luftmassenstrom abgegeben wird. Die Wärme, die an den vorbeiströmenden Luftmassenstrom abgegeben wird, wird ermittelt, indem die elektrische Energie, die zur Regelung des Heißfilms auf eine konstante Temperatur benötigt wird, gemessen wird. Es wird also letztendlich die Heizleistung gemessen und der Luftmassenstrom daraus bestimmt.The evaluation process, which takes place in block 10, represents a first type of evaluation process and is based on the measurement of the heat that is emitted to the air mass flow flowing past the sensor. The heat which is given off to the air mass flow flowing past is determined by measuring the electrical energy which is required to regulate the hot film to a constant temperature. Ultimately, the heating output is measured and the air mass flow is determined from it.
Die zweite Art der Erfassung des Luftmassenstromes bzw. das zweite Auswerteverfahren läuft im Block 12 ab und erfolgt durch Auswertung des Temperaturprofiles. Dabei wird der Heißfilm des Sensors 13 ebenfalls auf konstante Temperatur geregelt. Als Meßsignal wird jedoch nicht die benötigte Heizleistung verwendet, sondern das Temperaturprofil am Membranrand des Heißfilm-Luftmassenmessers wird ermittelt. Der Luftmassenmesser muß also neben dem Heißfilm und dem Heizwiderstand wenigstens noch zwei temperaturabhängige Widerstände aufweisen. Bei einem solchen Heißfilm- Luftmassenmesser wird beispielsweise die Temperaturdifferenz zwischen einem stromaufwärts und einem stromabwärts vom Heizbereich liegenden temperaturabhängigen Widerstand, der als Temperatursensor dient, ausgewertet.The second type of detection of the air mass flow or the second evaluation process takes place in block 12 and is carried out by evaluating the temperature profile. The hot film of the sensor 13 is also regulated to a constant temperature. However, the required signal is not used Heating power used, but the temperature profile at the membrane edge of the hot film air mass meter is determined. The air mass meter must therefore have at least two temperature-dependent resistors in addition to the hot film and the heating resistor. In the case of such a hot film air mass meter, for example, the temperature difference between an upstream and a downstream temperature-dependent resistor, which serves as a temperature sensor, is evaluated.
Die beiden von den Blöcken 10 und 11 abgegebenen Ausgangssignale Sl und S2 werden einer gemeinsamen Auswerteeinrichtung 12 zugeführt. In dieser Auswerteeinrichtung 12 erfolgt die Auswertung der beiden nach unterschiedlichen Verfahren erhaltenen Signale Sl und S2 und dabei erfolgt eine Kompensation der Störeffekte. Das Ausgangssignal der Auswerteeinrichtung 12 wird dann als korrigiertes Meßsignal KM der weiteren Verarbeitung zugeführt. Diese weitere Verarbeitung kann beispielsweise im Steuergerät einer Brennkraftmaschine erfolgen, das aus dem Meßsignal, das dann die im Saugrohr einer Brennkraftmaschine tatsächlich strömende Luftmasse angibt, die die für die Regelung der Brennkraftmaschine erforderlichen Ansteuersignale berechnet.The two output signals S1 and S2 emitted by blocks 10 and 11 are fed to a common evaluation device 12. The evaluation of the two signals S1 and S2 obtained by different methods takes place in this evaluation device 12, and the interference effects are compensated for. The output signal of the evaluation device 12 is then fed as a corrected measurement signal KM for further processing. This further processing can take place, for example, in the control unit of an internal combustion engine, which uses the measurement signal, which then specifies the air mass actually flowing in the intake manifold of an internal combustion engine, to calculate the control signals required for regulating the internal combustion engine.
Die in der Figur dargestellte Anordnung stellt einen Heißfilm-Luftmassenmesser dar, bei dem ein Sensor vorhanden ist, der in zwei unterschiedlichen Verfahren betreibbar ist, bzw. bei dem die Luftmasse nach zwei unterschiedlichen Verfahren bestimmt wird. Eine solche Anordnung ermöglicht es, den Luftmassenstrom redundant zu erfassen durch Messung der Heizleistung und durch Auswertung des Temperaturprofils. Da beide Meßverfahren unterschiedlich auf Störeffekte reagieren, kann aus dem Vergleich der beiden Sensorsignale auf die Art und die Größenordnung der betreffenden Störeffekte geschlossen werden, und die so ermittelten Störeffekte können bei der weiteren Signalauswertung berücksichtigt und damit kompensiert werden.The arrangement shown in the figure represents a hot film air mass meter, in which a sensor is present which can be operated in two different methods, or in which the air mass is determined by two different methods. Such an arrangement enables the air mass flow to be recorded redundantly by measuring the heating power and by evaluating the temperature profile. Since the two measuring methods react differently to interference effects, the type and magnitude of the two can be compared from the two sensor signals Interference effects are closed, and the interference effects determined in this way can be taken into account in the further signal evaluation and thus compensated for.
Anstelle eines einzigen Sensors können auch zwei verschiedene Sensoren eingesetzt werden, die als HFM 2 bzw. HFM5 bekannt sind, wobei dann ein erster Sensor ein Heißfilmluftmassenmesser (HFM2) ist, bei dem die Erfassung des Luftmassenstromes durch Messung der Heizleistung erfolgt und ein zweiter Sensor ein Heißfilmluftmassenmesser (HFM5) ist, bei dem die Erfassung des Luftmassenstromes durch Auswertung des Temperaturprofiles auf der Sensormembran erfolgt. Es werden dann also auch wieder Auswerteverfahren einer ersten Art und Auswerteverfahren einer zweiten Art durchgeführt und die Meßergebnisse miteinander kombiniert, allerdings für zwei Sensoren bzw. Sensorelemente.Instead of a single sensor, it is also possible to use two different sensors, known as HFM 2 or HFM5, in which case a first sensor is a hot film air mass meter (HFM2), in which the air mass flow is measured by measuring the heating power and a second sensor Hot film air mass meter (HFM5), in which the air mass flow is recorded by evaluating the temperature profile on the sensor membrane. Evaluation methods of a first type and evaluation methods of a second type are then carried out again and the measurement results are combined with one another, however for two sensors or sensor elements.
Die Erfindung wurde für die Bestimmung einer strömenden Luftmasse erläutert, sie ist aber grundsätzlich überall dort anwendbar, wo ein strömendes Medium ein beheizbares Meßelement beeinflußt. The invention has been explained for the determination of a flowing air mass, but it can basically be used wherever a flowing medium influences a heatable measuring element.

Claims

Ansprüche Expectations
1. Verfahren und/oder Vorrichtung zur Ermittlung des Durchsatzes eines strömenden Mediums, insbesonders der im Saugrohr einer Brennkraftmaschine strömenden Luftmasse, bei dem der Luftmassenstrom nach zwei unterschiedlichen Auswerteverfahren ermittelt wird und die beiden unterschiedlichen Meßergebnisse miteinander kombiniert werden, zur Ermittlung von Korrekturgrößen, dadurch gekennzeichnet, dass beide Auswerteverfahren auf die Ausgangssignale jeweils eines Durchsatzmeßelements zurückgreifen, und beide Verfahren unterschiedlich auf Störeffekte reagieren, so daß aus dem Vergleich der beiden Signale auf die Art und/oder die Größenordnung von auftretenden Störeffekten geschlossen wird.1. Method and / or device for determining the throughput of a flowing medium, in particular the air mass flowing in the intake manifold of an internal combustion engine, in which the air mass flow is determined using two different evaluation methods and the two different measurement results are combined with one another to determine correction variables, characterized that both evaluation methods rely on the output signals of one flow rate measuring element each, and that both methods react differently to interference effects, so that the type and / or the magnitude of interference effects occurring can be inferred from the comparison of the two signals.
2. Verfahren und/oder Vorrichtung zur Ermittlung des Durchsatzes eines strömenden Mediums nach Anspruch 1, dadurch gekennzeichnet, daß der Sensor ein Heißfilm- Luftmassenmesser ist oder beide Sensoren Heißfilm- Luftmassenmesser sind, und beide Auswerteverfahren voraussetzen, dass der Heißfilm jeweils auf konstante Temperatur geregelt wird.2. The method and / or device for determining the throughput of a flowing medium according to claim 1, characterized in that the sensor is a hot film air mass meter or both sensors are hot film air mass meter, and both evaluation methods require that the hot film is regulated in each case to a constant temperature becomes.
3. Verfahren und/oder Vorrichtung zur Ermittlung des Durchsatzes eines strömenden Mediums, dadurch gekennzeichnet, daß beim ersten Auswerteverfahren die benötigte Heizleistung gemessen wird.3. Method and / or device for determining the throughput of a flowing medium, thereby characterized in that the required heating power is measured in the first evaluation method.
4. Verfahren und/oder Vorrichtung zur Ermittlung des Durchsatzes eines strömenden Mediums nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß beim zweiten Auswerteverfahren ein Temperaturprofil ermittelt wird.4. The method and / or device for determining the throughput of a flowing medium according to one of claims 1 or 2, characterized in that a temperature profile is determined in the second evaluation method.
5. Verfahren und Vorrichtung zur Ermittlung des Durchsatzes eines strömenden Mediums nach Anspruch 4, dadurch gekennzeichnet, daß die Temperaturdifferenz zwischen einem bezogen auf die Richtung des strömenden Mediums stromaufwärts und einem stromabwärts vom Heizbereich liegenden Temperatursensor ausgewertet wird.5. The method and device for determining the throughput of a flowing medium according to claim 4, characterized in that the temperature difference between an upstream relative to the direction of the flowing medium and a downstream of the heating area temperature sensor is evaluated.
6. Verfahren und Vorrichtung zur Ermittlung des Durchsatzes eines strömenden Mediums nach Anspruch 4, dadurch gekennzeichnet, daß die beiden Temperatursensoren temperaturabhängige Widerstände sind, die in einer Brückenschaltung liegen und daß die sich in Folge der herrschenden Temperaturdifferenz einstellende Brückenspannung als Meßsignal ausgewertet wird 6. The method and device for determining the throughput of a flowing medium according to claim 4, characterized in that the two temperature sensors are temperature-dependent resistors which are located in a bridge circuit and that the bridge voltage which arises as a result of the prevailing temperature difference is evaluated as a measurement signal
EP01271494A 2000-12-21 2001-12-07 Method and device for determining the throughput of a flowing medium Expired - Lifetime EP1356198B1 (en)

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EP1356198B1 (en) 2006-03-08
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CN1283917C (en) 2006-11-08
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