EP1711703A1 - Verfahren zum adaptieren eines messwertes eines luftmassensensors - Google Patents
Verfahren zum adaptieren eines messwertes eines luftmassensensorsInfo
- Publication number
- EP1711703A1 EP1711703A1 EP05716613A EP05716613A EP1711703A1 EP 1711703 A1 EP1711703 A1 EP 1711703A1 EP 05716613 A EP05716613 A EP 05716613A EP 05716613 A EP05716613 A EP 05716613A EP 1711703 A1 EP1711703 A1 EP 1711703A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- value
- adaptation
- air mass
- determined
- mass sensor
- 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
Links
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
- 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
- F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
- F02D41/2474—Characteristics of sensors
-
- 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
- F02D41/2454—Learning of the air-fuel ratio control
Definitions
- the invention relates to a method for adapting a measured value of an air mass sensor.
- the air mass sensor can in particular be arranged in an internal combustion engine for detecting an air mass flow in cylinders of the internal combustion engine.
- Such air mass sensors detect the air mass flow that flows into a collector.
- the collector communicates with the cylinders of the internal combustion engine via suction pipes and supplies them with fresh air.
- Known air mass meters are regularly designed in the form of a heatstone measuring bridge, with a high-resistance temperature-dependent resistor to compensate for the temperature temperature of the intake air in one branch and a low-resistance temperature-dependent resistor in the other branch, the heating power of which is characteristic of the air mass flowing past.
- the heating resistor is usually designed as a so-called hot film resistor. During the operation of the internal combustion engine, dirt particles and oil drops are deposited on the hot film resistor. As a result, the behavior of the measuring resistor changes.
- the object of the invention is to create a method for adapting a measured value of an air mass sensor which is simple and at the same time ensures precise measured values of the air mass sensor over a long operating time of the air mass sensor.
- the invention is characterized by a method for adapting a measured value of an air mass sensor, in which a correction value, if predetermined operating conditions exist, is determined as a function of the measured value and a comparison value, which is determined as a function of at least one further measured value of a further sensor.
- An adaptation value is adjusted depending on the correction value, the duration since the adaptation value was last determined and the change in the adaptation value since the adaptation value was last adapted. Measured values recorded subsequently are corrected with the adaptation value.
- the adaptation value is adapted to be more dependent on the correction value. This makes it easy to take into account the fact that if the adaptation value is adjusted less frequently, aging effects of the air mass sensor are more pronounced and can thus be compensated for again by the stronger adaptation depending on the correction value.
- an initialization value is assigned to the adaptation value.
- an unauthorized modification to the air mass sensor can be, for example, the replacement of the air mass sensor without a control device which detects and processes the measurement signals of the air mass sensor being informed of this. In a motor vehicle, for example, this can be done by replacing the air mass sensor outside of a workshop authorized for this purpose.
- An unauthorized modification can be recognized particularly easily by the fact that there is a negative change in the adaptation value, the amount of which is greater than a predetermined one first threshold value, and a duration since the last determination of the correction value is less than a predetermined second threshold value.
- the duration can be a time period in a particularly simple manner, but it can also be dependent on the operating duration of the air mass sensor and, for example in an internal combustion engine, can be dependent on a certain number of driving cycles or a distance traveled in the meantime.
- a predetermined fourth threshold value is characteristic of an unusual contamination on the air mass sensor. A faulty reaction can then simply occur if unusual soiling is detected.
- This incorrect reaction is advantageously an indication of an error which occurs in such a way that a driver of a motor vehicle in which the air mass meter can be arranged recognizes that there is an error.
- the error can e.g. be displayed optically or acoustically.
- first correction value is determined when there are predetermined first operating conditions.
- the second correction value is determined when predetermined second operating conditions exist.
- a first adaptation value is adjusted depending on the first correction value.
- a second adaptation value is adjusted.
- Measured values of the air mass sensor recorded subsequently are corrected with an adaptation value which is interpolated between the first and the second adaptation value depending on the current operating conditions.
- FIG. 1 shows an internal combustion engine with an air mass sensor
- 2A, 2B show a flowchart of a first embodiment of a program for adapting an adaptation value of an air mass sensor
- FIGS. 3A and 3B show a further flow diagram of a second embodiment of a program for adapting a plurality of adaptations
- FIG. 4 shows a flow chart of a program for performing the adaptation of the measured value of the air mass sensor. Elements of the same construction and function are identified with the same reference symbols in all figures.
- An internal combustion engine (FIG. 1) comprises an intake tract 1, an engine block 2, a cylinder head 3 and an exhaust tract 4.
- the intake tract preferably comprises a throttle valve 11, further a collector 12 and an intake manifold 13, which leads to a cylinder ZI via an intake port in the engine block is guided.
- an exhaust gas recirculation device 13A can open into the intake tract 1, preferably in the area of the collector 12, which leads exhaust gases from the exhaust tract 4 back into the intake tract 1.
- the amount of the recirculated exhaust gas can be controlled by means of an exhaust gas recirculation valve 13B.
- the engine block further comprises a crankshaft 21 which is coupled to the piston 24 of the cylinder ZI via a connecting rod 25.
- the cylinder head 3 comprises a valve train with an inlet valve 30, an outlet valve 31 and valve drives 32, 33.
- the gas inlet valve 30 and the gas outlet valve 31 are driven by means of the camshaft.
- the cylinder head 3 further comprises an injection valve 34.
- a control device 6 which can also be referred to as a device for controlling the internal combustion engine and to which sensors are assigned, which record different measured variables and each determine the measured value of the measured variable.
- the control device 6 determines, depending on at least one of the measured variables, manipulated variables which are then converted into one or more actuating signals for controlling the actuators by means of corresponding actuators.
- the sensors are a pedal position sensor 71, which detects the position of an accelerator pedal 7, an air mass meter 14, which detects an air mass flow upstream of the throttle valve 11, a temperature sensor 15, which detects the intake air temperature T, a pressure sensor 16, which detects the suction pipe pressure, a crankshaft angle sensor 22, which detects a crankshaft angle and from which a rotational speed N is then determined, a further temperature sensor 23, which detects a coolant temperature, and a camshaft angle sensor 36a, which detects the camshaft angle.
- any subset of the sensors mentioned or additional sensors can be present.
- the actuators are, for example, the throttle valve 11, the gas inlet and gas outlet valves 30, 31, the injection valve 34 and the exhaust gas recirculation valve 13B.
- the internal combustion engine can also comprise further cylinders Z2-Z4, to which corresponding actuators are then also assigned.
- a program for determining an adaptation value which is stored in the control device 6, is executed when the internal combustion engine is operating.
- the program is in one ; Step S1 (FIG. 2A) started, in which variables are initialized if necessary.
- the start is preferably shortly after the start of the engine.
- Current operating conditions BB are determined in a step S2. This preferably takes place as a function of the speed N, the throttle curve THR, the intake air temperature T and the exhaust gas recirculation rate EGR and, if appropriate, also as a function of further variables or only as a function of a part of the variables mentioned.
- a step S3 it is checked whether the current operating conditions BB are the same as the predetermined first operating conditions BB1.
- the predetermined first operating conditions BB1 can be, for example, that the speed N has a value of, for example, 1,000 revolutions and the throttle curve, the temperature T and the exhaust gas recirculation rate assume predetermined, as constant as possible values.
- step S3 If the condition of step S3 is not met, the processing is continued in a step S4, in which the program remains for a predetermined waiting period T_W before the processing is continued again in step S2. If, on the other hand, the condition of step S3 is met, a first measured value MW1 is determined in step S5.
- the first measured value MW1 is preferably the measured value of the air mass sensor 14.
- a comparison value VW is determined, depending on at least one second measured value MW2 of another sensor, e.g. of the intake manifold pressure sensor 16.
- the comparison value is then determined, for example by means of a physical model, that is to say preferably a comparison value of the air mass flow is determined.
- a first correction value KW1 is determined depending on the first measured value MW1 and the comparison value VW. This can be done, for example, by forming the difference, the comparison value VW and the first measured value MW1.
- a first adaptation value AD1 is determined.
- An [n] denotes the currently calculated value and a [n-1] means a value determined during the previous adjustment.
- the current first adaptation value AD1 is then determined as a function of the previous first adaptation value AD1 and the first correction value KWl. This happens preferably by means of a first order filter. However, it can also be done by means of a higher-order filter or in another way known to those skilled in the art for such adaptations.
- a step S10 it is checked whether the amount of the first adaptation value AD1 that was currently determined is greater than a predetermined extreme value EXTR.
- the extreme value is predefined so that if the extreme value is exceeded, it can be assumed that such an exceeding is not possible due to the properties of the air mass sensor and the signal processing, and a limitation to this value must therefore take place.
- the extreme value EXTR can amount to 10 to 20% of the determined comparison value.
- step S10 If the condition of step S10 is met, the first adaptation value AD1 is limited in a step S11 to a minimum value AD_MIN or a maximum value AD_MAX, depending on its sign.
- step S12 (FIG. 2B) checks whether the change in the first adaptation value AD1, which is determined by means of the difference between the current and the previous first adaptation value AD1, is characteristic of a unauthorized modification to the air mass sensor.
- the change in the first adaptation value AD1 is characteristic of the unauthorized modification UM, for example, if it has a sign dependent on the respective air mass sensor and its amount exceeds a value dependent on the air mass sensor and at the same time the duration since the previous adaptation falls below a predeterminable value. tet.
- Such an unauthorized modification can, for example in the case of an air mass meter, consist in cleaning the heating resistor designed as a hot film resistor, but this information is not available to the control device 6. If the condition of step S12 is fulfilled, then in a step S13 the first adaptation value AD1 is assigned an initialization value AD1_INI for the first adaptation value AD1. This initialization value AD1_INI can be zero, for example.
- step S12 the condition of step S12 is not met, the first adaptation value AD1 is determined again in a step S14, depending on the duration D_AD1 since the last valid adaptation of the first adaptation value AD1, the previous first adaptation value AD1, i.e. not the one in which Step S8 in the current calculation run of the program determined first adaptation value AD1, and the correction value KWl determined. It can be taken into account that with increasing duration D_AD1 since the last valid adaptation of the first adaptation value AD1, in particular when the correction value KWl exceeds a predetermined value, the correction value KWl is more closely involved in the adaptation of the first adaptation value AD1.
- step S14 the processing is continued in step S2.
- FIGS. 3A and 3B A second embodiment of the program for adapting adaptation values is described below with reference to FIGS. 3A and 3B and the flow diagrams shown there. Only the differences from the program according to FIGS. 2A and 2B are described below.
- the program is started in a step S16, in which variables are initialized if necessary.
- the current operating conditions are determined in accordance with step S2.
- step S20 the first measured value MW1 of the air mass sensor 14 is determined in a step S22.
- the comparison value VW is then determined in a step S24, depending on the second measured value MW2 of at least one further sensor.
- This further sensor is preferably the intake manifold pressure sensor 16 and, accordingly, a measured value of the intake manifold pressure detected by it. It can additionally or alternatively also, for example, the crankshaft angle sensor, which detects the rotational speed N of the crankshaft and / or a sensor, which detects the throttle curve THR of the throttle valve 11. Using a corresponding model, the comparison value VW is then determined from these second measured values MW2.
- the first correction value KWl is then determined as a function of the first measured value MWl and the comparison value.
- the comparison value VW is preferably regarded as the reference value, that is to say as the correct value.
- the first correction value KWl is preferably determined from the difference between the comparison value VW and the first measured value MWl.
- a current first adaptation value AD1 is then determined, depending on the previous first adaptation value AD1 and the correction value KWl.
- this is preferably carried out by means of a first-order filter. However, it can also be done by means of a higher order filter.
- step S30 it is checked whether the amount of the first adaptation value, namely the current first adaptation value, is greater than the extreme value EXTR. This is done in accordance with step S10. If the condition of step S30 is fulfilled, the processing is continued in a step S32, which corresponds to step S11.
- step S32 the processing of the program is continued in a step S18.
- a value is determined in a step S38 which is characteristic of the unauthorized modification UM on the air mass sensor, preferably the air mass meter 14. This is preferably done depending on the current first adaptation value AD1, the previous first Adaptation value AD1, a first threshold value SW1, the duration D_AD1 since the last valid adaptation of the first adaptation value AD1 and a second SW2 threshold.
- the unauthorized modification UM on the air mass sensor 14 is then given when the difference between the current and the previous first adaptation value AD1, ie its change, is greater than the predetermined first threshold value SW1 and at the same time the duration D_AD1 since the last valid adaptation of the first Adaptation value AD1 is smaller than the predetermined second threshold value SW2.
- step S40 it is then checked whether there is an unauthorized modification UM on the air mass sensor. If this is the case, then in step S42 the current first adaptation value is set equal to the initialization value AD1_INI of the first adaptation value AD1 by means of the initialization value AD1_INI of the first adaptation value AD1. In addition, in step S42 a current second adaptation value AD2 is also initialized with an initialization value AD2__INI of the second adaptation value AD2. This then ensures that all adaptation values AD1, AD2 can be adapted again in new calculation cycles without being adversely affected by the adaptation values AD1, AD2 determined in the previous calculation cycles, and thus take into account the fact that the air mass sensor has been modified, e.g. was exchanged.
- step S44 if the condition of step S40 is not met, the first adaptation value AD1 may be determined again, in accordance with step S14.
- step S46 it is then checked whether the difference between the current adaptation value AD1 and the preceding first adaptation value AD1 is greater than a third threshold value and at the same time the duration D_AD1 since the last adaptation of the first adaptation value AD1 is less than a predetermined fourth threshold value SW4. If the condition of step S46 is not met, processing may continue in step S18 after the predetermined waiting period T_W.
- step S46 if the condition of step S46 is met, then there is an error and processing is continued in a step S48. If necessary, the error is only recognized after the condition of step S46 has been fulfilled a number of times during successive calculation runs, and then there is a faulty reaction, which may consist, for example, in that an error indication lamp MIL, which is also referred to as a malfunction indication lamp, tells the driver of a motor vehicle. in which the air mass meter is arranged signals an error. Subsequently, the processing is continued again, if necessary after the predetermined waiting period TW, in step S18.
- MIL error indication lamp
- step S20 if the condition of step S20 is not met, i.e. If the current operating conditions BB do not correspond to the predefined first operating conditions BB1, it is checked in a step S50 whether the current operating conditions BB correspond to predefined second operating conditions BB2.
- the specified second operating conditions BB2 depend, for example, on the speed N and are, for example, fulfilled when the speed is approximately 3000 revolutions.
- step S50 If the condition of step S50 is not met, processing continues in step S34. If, on the other hand, the condition of step S50 is fulfilled, then in a In step S52, the first measured value MW1 of the air mass sensor 14 is detected.
- step S54 the second measured value MW2 of the further sensor, that is to say preferably of the intake manifold pressure sensor 16 and, for example, of the crankshaft sensor 22, is then recorded, and the comparison value VW is then determined as a function of this or these second measured values MW2. This is done in accordance with step S24 and step S6.
- a second correction value KW2 is then determined depending on the first measured value MW1 determined in step S52 and the comparison value VW. This is done according to steps S26 and S7 by forming the difference.
- step S58 the second adaptation value AD2 is adapted, specifically depending on the second adaptation value -.> AD2 adapted in a previous adaptation and the second correction value KW2. This then also takes place in accordance with step S28.
- step S59 which corresponds to the steps S32 to S48 adapted for the determination of the second adaptation value AD2, with the duration D_AD1 since the last valid adaptation of the first adaptation value AD1 then corresponding to a duration D_AD2 of the duration since the last valid adaptation of the second adaptation value AD2, the first correction value KW1 are replaced by the second correction value KW2.
- the program can also be adapted accordingly for adapting further adaptation values when there are third, fourth and further predetermined operating conditions.
- the "pro- 3A, 3B can, however, also be adapted accordingly for only determining the first adaptation value AD1.
- FIG. 4 shows a flowchart of a program by means of which the measured values MW1 of the air mass sensor 14 are corrected.
- the program is started in a step S60.
- a step S62 the current operating conditions BB are determined, specifically in accordance with step S18. If necessary, the current operating conditions can also be determined in step S62 only as a function of one or more relevant measured variables, for example only as a function of the rotational speed N.
- the current adaptation value AD is then determined as a function of the operating conditions BB determined in step S62 and in accordance with interpolation between the or the determined adaptation values AD1, AD2 and, if appropriate, further variables.
- the first measured value MW1 is then determined in a step S66.
- a corrected first measured value MW_KOR is then determined by summing the first measured value MW1 and the current adaptation value AD.
- the program then remains in step S70 for a predetermined waiting period T_W before the processing is continued again in step S62.
- the adaptation value (s) are always saved and are available again when the program is started again.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004005134A DE102004005134A1 (de) | 2004-02-02 | 2004-02-02 | Verfahren zum Adaptieren eines Messwertes eines Luftmassensensors |
PCT/EP2005/050424 WO2005073542A1 (de) | 2004-02-02 | 2005-02-01 | Verfahren zum adaptieren eines messwertes eines luftmassensensors |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1711703A1 true EP1711703A1 (de) | 2006-10-18 |
EP1711703B1 EP1711703B1 (de) | 2009-08-19 |
Family
ID=34801451
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05716613A Expired - Fee Related EP1711703B1 (de) | 2004-02-02 | 2005-02-01 | Verfahren zum adaptieren eines messwertes eines luftmassensensors |
Country Status (4)
Country | Link |
---|---|
US (1) | US7444852B2 (de) |
EP (1) | EP1711703B1 (de) |
DE (2) | DE102004005134A1 (de) |
WO (1) | WO2005073542A1 (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005047240A1 (de) * | 2005-10-01 | 2007-04-05 | Daimlerchrysler Ag | Verfahren zur Korrektur von Messwerten |
DE602005021375D1 (de) * | 2005-11-30 | 2010-07-01 | Delphi Tech Holding Sarl | Verfahren und Vorrichtung zur Steuerung einer Brennkraftmaschine |
DE102007053406B3 (de) * | 2007-11-09 | 2009-06-04 | Continental Automotive Gmbh | Verfahren und Vorrichtung zur Durchführung sowohl einer Adaption wie einer Diagnose bei emissionsrelevanten Steuereinrichtungen in einem Fahrzeug |
SE534364C2 (sv) * | 2008-02-15 | 2011-07-26 | Scania Cv Abp | Metod och datorprogram för att anpassa en luftflödessensor i en fordonsmotor |
DE102008042764B4 (de) * | 2008-10-13 | 2021-02-25 | Robert Bosch Gmbh | Verfahren zum Betreiben eines Steuergeräts, Vorrichtung, Steuergeräte-Programm und Steuergeräte-Programmprodukt zur Durchführung des Verfahrens |
US9140203B2 (en) | 2011-11-15 | 2015-09-22 | Cummins Inc. | Apparent plumbing volume of air intake and fresh airflow value determination |
US9086025B2 (en) | 2011-11-21 | 2015-07-21 | Cummins Inc. | Systems and methods for correcting mass airflow sensor drift |
DE102011089898A1 (de) * | 2011-12-23 | 2013-06-27 | Continental Automotive Gmbh | Verfahren zum Betreiben eines Luftmassensensors |
DE102016202803B3 (de) * | 2016-02-24 | 2017-08-17 | Continental Automotive Gmbh | Verfahren zum Ermitteln einer Luftmasse in einer Brennkraftmaschine |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19733106A1 (de) * | 1997-07-31 | 1999-02-04 | Siemens Ag | Verfahren zum Steuern einer Brennkraftmaschine |
DE59913007D1 (de) * | 1998-07-29 | 2006-03-30 | Daimler Chrysler Ag | Verfahren zur Drehmomenteinstellung |
US6370935B1 (en) * | 1998-10-16 | 2002-04-16 | Cummins, Inc. | On-line self-calibration of mass airflow sensors in reciprocating engines |
DE19927674B4 (de) * | 1999-06-17 | 2010-09-02 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Steuerung einer Brennkraftmaschine |
DE10054199A1 (de) * | 2000-11-02 | 2002-05-16 | Siemens Ag | Verfahren zum Überprüfen der Funktionsfähigkeit eines Luftmassenmessers |
DE10132833A1 (de) * | 2001-07-06 | 2003-01-16 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Überwachung eines Drucksensors |
DE10251875B4 (de) * | 2001-11-09 | 2005-02-10 | Honda Giken Kogyo K.K. | Kraftstoffzufuhr-Steuer/Regelsystem für einen Motor mit innerer Verbrennung |
-
2004
- 2004-02-02 DE DE102004005134A patent/DE102004005134A1/de not_active Ceased
-
2005
- 2005-02-01 US US10/597,616 patent/US7444852B2/en not_active Expired - Fee Related
- 2005-02-01 DE DE502005007931T patent/DE502005007931D1/de active Active
- 2005-02-01 EP EP05716613A patent/EP1711703B1/de not_active Expired - Fee Related
- 2005-02-01 WO PCT/EP2005/050424 patent/WO2005073542A1/de not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO2005073542A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20080141975A1 (en) | 2008-06-19 |
WO2005073542A1 (de) | 2005-08-11 |
EP1711703B1 (de) | 2009-08-19 |
US7444852B2 (en) | 2008-11-04 |
DE502005007931D1 (de) | 2009-10-01 |
DE102004005134A1 (de) | 2005-08-18 |
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