EP1356198B1 - Method and device for determining the throughput of a flowing medium - Google Patents
Method and device for determining the throughput of a flowing medium Download PDFInfo
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- EP1356198B1 EP1356198B1 EP01271494A EP01271494A EP1356198B1 EP 1356198 B1 EP1356198 B1 EP 1356198B1 EP 01271494 A EP01271494 A EP 01271494A EP 01271494 A EP01271494 A EP 01271494A EP 1356198 B1 EP1356198 B1 EP 1356198B1
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- Prior art keywords
- throughput
- air mass
- flowing medium
- determining
- temperature
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Classifications
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- 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
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- 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
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- 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
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- 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 flow rate of a flowing medium, in particular for determining the prevailing in the intake manifold of an internal combustion engine air flow and thus for determining the intake air mass.
- air mass hot-film air mass meter For detecting the intake of an internal combustion engine air mass hot-film air mass meter are usually used. These have a heatable element, which is exposed to the air flow to be measured and is cooled by this. There are various possibilities for the design of the hot-film air mass meter, as well as for the heating control and the evaluation methods. Both types of air mass meters, or an existing method for detecting the mass air flow with a hot-film air mass meter, based on the measurement of the heat that is delivered to the passing air mass flow. For this purpose, in one type of air mass meters, the electrical energy needed to control the hot film to a constant temperature is measured. A second method, or a second associated Sensor arrangement, based on the fact that the hot film is also controlled to a constant temperature.
- the temperature difference between these two points is determined by means of a temperature sensor located upstream and downstream of the heating area.
- Both temperature sensors which are designed as temperature-dependent resistors, are part of a bridge circuit. From the resulting bridge voltage, a measurement signal is obtained which represents the temperature difference between the upstream and downstream of the heating temperature-dependent resistor.
- Both types of sensors or evaluation methods can be affected by disruptive effects such as humidity or soiling. This can lead to a false display of such a sensor, or to an error in the signal evaluation.
- DE 197 40 916 A1 discloses methods for determining the throughput of a flowing medium in the intake manifold of an internal combustion engine, in which the output signals of two different sensors, namely an air mass sensor and a pressure sensor, are evaluated. From both output signals, the air mass is finally determined. Since there are different sensors, the evaluation methods are different. In the evaluation method in which the output signal of a pressure sensor is evaluated, an additional measured variable, namely the throttle valve angle, is required to determine the air mass from the pressure signal.
- the object of the invention is to minimize the mentioned error sources and the resulting false indications.
- the object is achieved with a method and / or a device according to the invention for determining the flow rate of a flowing medium having the features of claim 1.
- the inventive method and / or the inventive device for determining the flow rate of a flowing medium, in particular of an internal combustion engine aspirated air mass has the advantage that disturbing effects in the measurement can be compensated. This is advantageously done by performing a redundant measurement operating on two different methods performed on a single sensor, or two different types of air mass measurement sensors, it being essential that the two selected methods and the two sensors react differently to parasitic effects. By combining the two measurement results, it is then possible to compensate for disturbing effects that occur more strongly in one method or the associated sensor than in the other method or in the other sensor.
- the air mass flow LS to be measured is determined according to two different methods, which both work with the same sensor 13, which comprises a heatable hot film.
- the sensor 13 is constructed so that it is suitable for both methods of measurement and is exposed to the flowing air mass flow LS, which cools him.
- the evaluation method which runs in block 10, represents a first type of evaluation method and is based on the measurement of the heat which is emitted at the air mass flow flowing past the sensor.
- the heat given off to the passing air mass flow is determined by measuring the electrical energy needed to control the hot film to a constant temperature. So it is ultimately the heating power measured and the air mass flow determined from it.
- the second type of detection of the air mass flow or the second evaluation process takes place in block 12 and takes place by evaluation of the temperature profile.
- the hot film of the sensor 13 is also regulated to a constant temperature.
- the measurement signal is not the required Heating power used, but the temperature profile at the diaphragm 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 such a hot-film air mass meter, for example, the temperature difference between an upstream and downstream of the heating area lying temperature-dependent resistance, which serves as a temperature sensor, evaluated.
- the two output from the blocks 10 and 11 output signals S1 and S2 are fed to a common evaluation device 12.
- this evaluation device 12 the evaluation of the two obtained by different methods signals S1 and S2 and there is a compensation of the parasitic effects.
- the output signal of the evaluation device 12 is then supplied as a corrected measurement signal KM for further processing.
- This further processing can be carried out, for example, in the control unit of an internal combustion engine, which then calculates the actual air mass flowing in the intake manifold of an internal combustion engine which calculates the control signals required for the control of the internal combustion engine.
- the arrangement shown in the figure represents a hot-film air mass meter, in which a sensor is present, which is operable in two different methods, or in which the air mass is determined by two different methods.
- a sensor is present, which is operable in two different methods, or in which the air mass is determined by two different methods.
- Such an arrangement makes it possible to redundantly detect the air mass flow by measuring the heating power and by evaluating the temperature profile. Since both measuring methods react differently to parasitic effects, the comparison of the two sensor signals on the type and magnitude of the relevant Disturbing effects are closed, and the interference effects thus determined can be taken into account in the further signal evaluation and thus compensated.
- HFM 2 hot-film air mass meter
- HFM5 Hot-film air mass meter
- Evaluation methods of a first type and evaluation method of a second type are then also 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 is generally applicable wherever a flowing medium affects a heatable measuring element.
Abstract
Description
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 flow rate of a flowing medium, in particular for determining the prevailing in the intake manifold of an internal combustion engine air flow and thus for determining the intake air mass.
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.For detecting the intake of an internal combustion engine air mass hot-film air mass meter are usually used. These have a heatable element, which is exposed to the air flow to be measured and is cooled by this. There are various possibilities for the design of the hot-film air mass meter, as well as for the heating control and the evaluation methods. Both types of air mass meters, or an existing method for detecting the mass air flow with a hot-film air mass meter, based on the measurement of the heat that is delivered to the passing air mass flow. For this purpose, in one type of air mass meters, the electrical energy needed to control the hot film to a constant temperature is measured. A second method, or a second associated Sensor arrangement, based on the fact that the hot film is also controlled to a constant temperature. As a measuring signal, however, not the required heating power is used, but the temperature profile at the edge of the membrane formed as a hot film. In this case, the temperature difference between these two points is determined by means of a temperature sensor located upstream and downstream of the heating area. Both temperature sensors, which are designed as temperature-dependent resistors, are part of a bridge circuit. From the resulting bridge voltage, a measurement signal is obtained which represents the temperature difference between the upstream and downstream of the heating temperature-dependent resistor.
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 affected by disruptive effects such as humidity or soiling. This can lead to a false display of such a sensor, or to an error in the signal evaluation.
Aus der DE 197 40 916 A1 sind Verfahren zur Ermittlung des Durchsatzes eines strömenden Mediums im Saugrohr einer Brennkraftmaschine bekannt, bei denen die Ausgangssignale zweier unterschiedlicher Sensoren, nämlich eines Luftmassensensors und eines Drucksensors ausgewertet werden. Aus beiden Ausgangssignalen wird letztendlich die Luftmasse bestimmt. Da es unterschiedliche Sensoren sind, sind auch die Auswerteverfahren unterschiedlich. Bei dem Auswerteverfahren, bei dem das Ausgangssignal eines Drucksensors ausgewertet wird, wird noch eine zusätzliche Messgröße, nämlich der Drosselklappenwinkel, benötigt, um aus dem Drucksignal die Luftmasse zu bestimmen.DE 197 40 916 A1 discloses methods for determining the throughput of a flowing medium in the intake manifold of an internal combustion engine, in which the output signals of two different sensors, namely an air mass sensor and a pressure sensor, are evaluated. From both output signals, the air mass is finally determined. Since there are different sensors, the evaluation methods are different. In the evaluation method in which the output signal of a pressure sensor is evaluated, an additional measured variable, namely the throttle valve angle, is required to determine the air mass from the pressure signal.
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 mentioned error sources and the resulting false indications. The object is achieved with a method and / or a device according to the invention for determining the flow rate of a flowing medium having the features of
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 inventive method and / or the inventive device for determining the flow rate of a flowing medium, in particular of an internal combustion engine aspirated air mass, has the advantage that disturbing effects in the measurement can be compensated. This is advantageously done by performing a redundant measurement operating on two different methods performed on a single sensor, or two different types of air mass measurement sensors, it being essential that the two selected methods and the two sensors react differently to parasitic effects. By combining the two measurement results, it is then possible to compensate for disturbing effects that occur more strongly 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 having the features of
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 dependent claims.
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 will be explained in more detail in the following description.
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 flow rate of a flowing medium there is a risk that the accuracy is affected by disruptive effects. 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 caused, for example, by the fact that the humidity of the flowing air is not known exactly or that the sensor elements in continuous use be dirty, which can set errors in the evaluation. Another problem in the measurement of air flowing in the intake manifold of an internal combustion engine air is caused by the fact that the flow is not always in one direction, but a so-called flow reversal, or pulsation, can occur. To compensate for errors and in particular to compensate for the disturbing effects caused by such Saugrohrpulsationen, it is known to carry out the determination of the flowing air mass according to two different methods and to combine the results obtained with each other, so as 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, in DE-OS 39 25 377 a method for Meßfehlerkorrektur proposed in which the occurring due to backflow measurement error of a hot-film air mass meter is compensated. For this purpose, the air mass is detected with the hot-film air mass meter as a first value and the second value is calculated according to a method independently operating the air mass by the throttle angle and the speed of the internal combustion engine are evaluated. Which value is used for the actual determination of the air mass depends on the operating range in which the internal combustion engine is located. Since the two values have different collateral 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 for increasing the measuring reliability.
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, however, are not taken into account. In the known method, moreover, only one air mass sensor is used, the second information, the are required for the calculation of the air mass, are not measured directly, but calculated, they can not be used for the inventive correction or compensation of general, various measurement errors.
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, different measurement errors can be compensated and thus a very reliable and accurate detection of the flow rate of a flowing medium, for example the air mass taken in by an internal combustion engine, can be obtained. For this purpose, in the exemplary embodiment illustrated in FIG. 1 as a block arrangement, the air mass flow LS to be measured is determined according to two different methods, which both work with the
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 method, which runs in
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
Die beiden von den Blöcken 10 und 11 abgegebenen Ausgangssignale S1 und S2 werden einer gemeinsamen Auswerteeinrichtung 12 zugeführt. In dieser Auswerteeinrichtung 12 erfolgt die Auswertung der beiden nach unterschiedlichen Verfahren erhaltenen Signale S1 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 from the
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 is operable in two different methods, or in which the air mass is determined by two different methods. Such an arrangement makes it possible to redundantly detect the air mass flow by measuring the heating power and by evaluating the temperature profile. Since both measuring methods react differently to parasitic effects, the comparison of the two sensor signals on the type and magnitude of the relevant Disturbing effects are closed, and the interference effects thus determined can be taken into account in the further signal evaluation and thus compensated.
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, two different sensors can be used, which are known as
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 is generally applicable wherever a flowing medium affects a heatable measuring element.
Claims (6)
- Method for determining the throughput of a flowing medium, in particular the air mass flow rate flowing in the intake manifold of an internal combustion engine, in which method the air mass flow rate is determined according to two different evaluation methods and the two different measurement results are combined with one another, in order to determine correction variables, in which the two evaluation methods make use of different measurement signals of the same throughput measuring element (13) or different measurement signals of two throughput measuring elements (HFM2, HFM5), in which the two evaluation methods react differently to interference effects so that the type and/or the order of magnitude of interference effects which occur can be obtained from a comparison between the two signals, characterized in that the throughput measuring element (13) is a hot-film air mass flow rate metre, and in that the two throughput measuring elements (HFM2, HFM5) are hot-film air mass flow rate metres and the two evaluation methods require the hot film or the two hot films each to be adjusted to a constant temperature.
- Method for determining the throughput of a flowing medium according to Claim 1, characterized in that in the first evaluation method the required heating power is measured.
- Method for determining the throughput of a flowing medium according to Claim 1, characterized in that in the second evaluation method a temperature profile is determined.
- Method for determining the throughput of a flowing medium according to Claim 3, characterized in that the temperature difference between a temperature-dependent resistor which is upstream with respect to the direction of the flowing medium and a temperature-dependent resistor which is downstream of the heating region is evaluated, each of the resistors serving as a temperature sensor.
- Method for determining the throughput of a flowing medium according to Claim 3, characterized in that the two temperature sensors are temperature-dependent resistors which are located in a bridge circuit, and in that the bridge voltage which occurs as a result of the prevailing temperature difference is evaluated as a measurement signal.
- Device for determining the throughput of a flowing medium, characterized in that the device comprises means which carry out a method according to one of the preceding claims.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10063752A DE10063752A1 (en) | 2000-12-21 | 2000-12-21 | Method and device for determining the throughput of a flowing medium |
| DE10063752 | 2000-12-21 | ||
| PCT/DE2001/004624 WO2002050412A1 (en) | 2000-12-21 | 2001-12-07 | Method and device for determining the throughput of a flowing medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1356198A1 EP1356198A1 (en) | 2003-10-29 |
| EP1356198B1 true EP1356198B1 (en) | 2006-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01271494A Expired - Lifetime EP1356198B1 (en) | 2000-12-21 | 2001-12-07 | Method and device for determining the throughput of a flowing medium |
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| Country | Link |
|---|---|
| US (1) | US7096723B2 (en) |
| EP (1) | EP1356198B1 (en) |
| JP (1) | JP2004516465A (en) |
| KR (1) | KR20020081337A (en) |
| CN (1) | CN1283917C (en) |
| DE (2) | DE10063752A1 (en) |
| WO (1) | WO2002050412A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010030952A1 (en) | 2010-07-05 | 2012-01-05 | Innovative Sensor Technology Ist Ag | Device for determining and monitoring e.g. volume flow rate of biological fluid, calculates correction value based on flow rate values determined using measured temperatures, and power required to maintain temperature of heating element |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10163751A1 (en) | 2001-12-27 | 2003-07-17 | Bosch Gmbh Robert | Method for operating an internal combustion engine |
| JP3964347B2 (en) * | 2003-04-18 | 2007-08-22 | 株式会社ケーヒン | Intake device for internal combustion engine |
| JP2006242748A (en) * | 2005-03-03 | 2006-09-14 | Hitachi Ltd | Heating resistor type air flow measurement apparatus and its measurement error correction method |
| CN100491931C (en) * | 2005-04-14 | 2009-05-27 | 中国科学院电工研究所 | Flow detecting device |
| DE102006010710B4 (en) * | 2006-03-08 | 2009-03-19 | Audi Ag | Method for air mass determination in internal combustion engines |
| JP4202400B1 (en) * | 2007-07-27 | 2008-12-24 | 三菱重工業株式会社 | Crack growth prediction method and program |
| DE102009000067A1 (en) * | 2009-01-08 | 2010-08-26 | Innovative Sensor Technology Ist Ag | Device for determining and/or monitoring mass flow rate of e.g. liquid, has evaluation unit determining information about measurement of measuring units and correction value for determination of values |
| JP2012207925A (en) * | 2011-03-29 | 2012-10-25 | Denso Corp | Thermal air flowmeter |
| DE102013102398B4 (en) | 2013-03-11 | 2024-05-02 | Innovative Sensor Technology Ist Ag | Thermal flow sensor for determining the composition of a gas mixture and its flow velocity |
| CN105181544A (en) * | 2015-09-21 | 2015-12-23 | 劲天环境科技（上海）有限公司 | Detection device and detection method for concentration of particulate matter in air |
| DE102019110876A1 (en) * | 2019-04-26 | 2020-10-29 | Endress+Hauser Flowtec Ag | Method for operating a probe of a thermal flow measuring device and a thermal flow measuring device with such a probe |
| JP7268533B2 (en) * | 2019-08-23 | 2023-05-08 | トヨタ自動車株式会社 | engine controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4043196A (en) * | 1976-02-09 | 1977-08-23 | Technology Incorporated | Method and apparatus for effecting fluid flow measurement in a single sensor |
| JPH0750099B2 (en) * | 1987-09-29 | 1995-05-31 | 三菱電機株式会社 | Fuel property detection device for internal combustion engine |
| KR940002956B1 (en) * | 1987-09-29 | 1994-04-09 | 미쓰비시전기주식회사 | Air-fuel ratio controlling apparatus for internal combustion engine |
| DE3917908A1 (en) * | 1989-06-01 | 1990-12-06 | Siemens Ag | METHOD FOR DETERMINING THE AIR FILLING OF THE WORKING VOLUME OF A COMBINED PISTON INTERNAL COMBUSTION ENGINE AND FOR DETERMINING THE FUEL INJECTION LEVEL |
| DE3925377A1 (en) | 1989-08-01 | 1991-02-07 | Bosch Gmbh Robert | METHOD FOR CORRECTING THE MEASURING ERRORS OF A HOT FILM AIRMETER |
| GB2270165B (en) * | 1992-08-28 | 1995-11-08 | Delco Electronics Corp | Method and apparatus for determining air pressure in an engine |
| DE4334090C2 (en) * | 1992-10-07 | 1998-04-09 | Hitachi Ltd | Method and system for measuring an air flow rate |
| JP3141762B2 (en) * | 1995-12-13 | 2001-03-05 | 株式会社日立製作所 | Air flow measurement device and air flow measurement method |
| DE19740916B4 (en) | 1997-04-01 | 2007-05-10 | Robert Bosch Gmbh | Method for operating an internal combustion engine |
| US6109249A (en) * | 1997-09-17 | 2000-08-29 | Robert Bosch Gmbh | System for operating an internal combustion engine |
| US6370935B1 (en) * | 1998-10-16 | 2002-04-16 | Cummins, Inc. | On-line self-calibration of mass airflow sensors in reciprocating engines |
| DE19927674B4 (en) * | 1999-06-17 | 2010-09-02 | Robert Bosch Gmbh | Method and device for controlling an internal combustion engine |
| DE19933665A1 (en) * | 1999-07-17 | 2001-01-18 | Bosch Gmbh Robert | Device for detecting a pulsating variable |
-
2000
- 2000-12-21 DE DE10063752A patent/DE10063752A1/en not_active Withdrawn
-
2001
- 2001-12-07 KR KR1020027010825A patent/KR20020081337A/en not_active Application Discontinuation
- 2001-12-07 CN CNB018053092A patent/CN1283917C/en not_active Expired - Fee Related
- 2001-12-07 EP EP01271494A patent/EP1356198B1/en not_active Expired - Lifetime
- 2001-12-07 JP JP2002551278A patent/JP2004516465A/en active Pending
- 2001-12-07 WO PCT/DE2001/004624 patent/WO2002050412A1/en active IP Right Grant
- 2001-12-07 US US10/204,519 patent/US7096723B2/en not_active Expired - Fee Related
- 2001-12-07 DE DE50109150T patent/DE50109150D1/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010030952A1 (en) | 2010-07-05 | 2012-01-05 | Innovative Sensor Technology Ist Ag | Device for determining and monitoring e.g. volume flow rate of biological fluid, calculates correction value based on flow rate values determined using measured temperatures, and power required to maintain temperature of heating element |
| DE102010030952B4 (en) | 2010-07-05 | 2022-05-25 | Innovative Sensor Technology Ist Ag | Device for determining and/or monitoring a volume flow and/or a flow rate |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002050412A1 (en) | 2002-06-27 |
| DE10063752A1 (en) | 2002-06-27 |
| CN1411534A (en) | 2003-04-16 |
| US20030177843A1 (en) | 2003-09-25 |
| DE50109150D1 (en) | 2006-05-04 |
| US7096723B2 (en) | 2006-08-29 |
| CN1283917C (en) | 2006-11-08 |
| EP1356198A1 (en) | 2003-10-29 |
| JP2004516465A (en) | 2004-06-03 |
| KR20020081337A (en) | 2002-10-26 |
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