EP4295023A1 - Detektion eines abbrands in einer sauganlage - Google Patents
Detektion eines abbrands in einer sauganlageInfo
- Publication number
- EP4295023A1 EP4295023A1 EP22701378.6A EP22701378A EP4295023A1 EP 4295023 A1 EP4295023 A1 EP 4295023A1 EP 22701378 A EP22701378 A EP 22701378A EP 4295023 A1 EP4295023 A1 EP 4295023A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- determined
- vehicle drive
- engine
- intake system
- value
- 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.)
- Pending
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
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- 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
- F02D41/0002—Controlling intake air
-
- 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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
- F02D41/1456—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio with sensor output signal being linear or quasi-linear with the concentration of oxygen
-
- 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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
- F02D41/1458—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio with determination means using an estimation
Definitions
- the invention relates to a method for diagnosing a state and/or control of an internal combustion engine, in particular for detecting and/or determining a burn-off, in particular a soot burn-off, in an intake system of the internal combustion engine, as well as a control means for carrying out such a method and a vehicle drive with an internal combustion engine, an intake system, an exhaust system and such a detection means.
- the relative engine charge is determined in modern engine control devices or engine routines as a function of operating states, which do not reflect the changed conditions during combustion - taking into account load cases, operating and/or environmental conditions, but still based on regular operation.
- the relative engine filling can often not be determined with sufficient accuracy in the event of a burn-up.
- a method for diagnosing and/or controlling a vehicle drive which has at least one internal combustion engine, an air collector and an exhaust gas duct.
- the vehicle drive has exhaust gas recirculation, in particular from the exhaust gas duct to the air collector.
- the method is carried out to detect and/or determine a burn-off in the intake system and has one, several or all of the following method steps, which can be carried out in the specified order or in another suitable order:
- the difference is determined by a difference between the theoretical combustion air ratio and the measured combustion air ratio.
- the difference quantity can, for example, also specify a size ratio of the theoretically determined and measured combustion air ratio to one another and/or an absolute or relative difference value of the two determined combustion air ratios.
- the theoretical and/or the measured combustion air ratio represents in particular an excess of fuel or an excess of oxygen in a fuel-air mixture, based on a stoichiometric ratio (in particular of 1) at which all of the fuel and all of the oxygen in the mixture are completely combined react so that after ignition neither excess fuel nor oxygen remains or is detectable in the exhaust gases.
- the determined value of the differential variable can be used to detect whether burn-off is taking place in the intake system, in particular by storing for certain values of the differential variable, for example in a lookup table of a control means of the vehicle drive, that this value is for a possibly characterized in more detail in the lookup table, burnup is representative, or indicates that there is no relevant burnup.
- a control device in particular a detection and/or determination device, for detecting and/or determining erosion in an intake system of an internal combustion engine is disclosed, which is set up to carry out a method according to an embodiment of the invention.
- a vehicle drive comprising an internal combustion engine, an intake system and an exhaust system is disclosed. The vehicle drive has a control means according to an embodiment of the invention.
- the vehicle drive also has an exhaust gas recirculation line, which is set up to connect the exhaust system to the intake system in a gas-carrying manner.
- the invention and the associated possibility of detecting burn-up during regular operation of the internal combustion engine is particularly helpful. This is because the recirculated exhaust gas can reach significantly higher temperatures than the compressed but cooled fresh air that is supplied, even if the recirculated exhaust gas has passed through an EGR cooler.
- EGR exhaust gas recirculation
- the air collector of the intake system - into which the EGR line flows - is often made of a plastic material, which is why under very unfavorable operating conditions, for example with high ambient temperatures and a permanent full load of the internal combustion engine, leaks, for example due to the temperature input of the recirculated exhaust gases and an associated Soot burn-off in a plastic air collector Leaks can occur, especially if there is already a certain amount of sooting in the most heavily used wall sections.
- the invention is based, among other things, on the consideration that the relative engine charge is a central input variable for many engine functions.
- An exact determination of the engine filling is of central importance, especially for diagnosing the air system (e.g. when detecting leaks).
- the temperature of the mass flow drawn in by the engine e.g. fresh air including any EGR
- deposits e.g. soot
- This energy input is included in the calculation not taken into account, which greatly falsifies the calculated engine filling in the event of a burn-up.
- the invention is now based, among other things, on the idea of taking into account the temperature increase in the event of a burn-off in the intake system, in particular a soot burn-off, as follows:
- the lambda value of the exhaust gas (i.e. the measured combustion air ratio) is measured with the help of a lambda probe, especially in the exhaust gas duct after the turbocharger.
- the measured lambda value takes into account the amount of fuel burned and any deposits that may have burned off in the intake system.
- a theoretical lambda value i.e. theoretical air/fuel ratio
- a theoretical lambda value can be calculated using the injected fuel quantity and the intake fresh air mass (based on the fresh air mass meter), in particular using operating models of the vehicle drive.
- both lambda values - the measured and the calculated one - are the same; at least apart from model and/or sensor inaccuracies.
- the control means predetermines up to which relative and/or absolute difference (e.g. in the sense of a predefined threshold value) between the calculated and the measured lambda value no combustion, but a measurement deviation or the like is interpreted and is thus detected.
- the lambda values are not equal (and deviate from each other by more than the threshold value); the difference can be converted into a theoretical (e.g. soot) amount burned off. From this, a heat output can be determined, which is taken into account in an, in particular model-based, temperature calculation of the intake mass flow. This significantly increases the accuracy of the calculation of the engine filling in the event of a burn-up.
- burn-off in the intake system is detected when the difference variable shows and/or a particularly relevant deviation between the theoretically determined value and the measured value
- regular operation in the intake system is detected if the difference variable shows no or no relevant deviation between the theoretically determined and the measured value.
- the influence of combustion on the real lambda value of the exhaust gases in the exhaust gas duct which is not stored in the operating models of the internal combustion engine and/or the vehicle drive, can be detected, and in particular its difference to the model-based, i.e. theoretical, determined lambda value.
- Controlled operation is to be understood in particular as meaning that operation takes place at least essentially in the way that is modeled for this operating state with regard to the model variables used, in particular also the combustion air ratio, in the operating models of the vehicle drive.
- the differential variable indicates a burnup when the theoretical combustion air ratio results in leaner operation than the measured combustion air ratio.
- the theoretical air/fuel ratio is determined by a model-based calculation, which includes assumptions stored in the model about relationships between a temperature in the air collector and a composition of the exhaust gases from combustion during regular operation of the internal combustion engine in a specific operating state.
- a combustion quantity is determined as a function of a determined value of the difference variable.
- the amount burned can be calculated directly from the difference between the two lambda values.
- suitable substitute reactions for adjusting an engine filling can be selected and/or taken directly or indirectly, for example opening the EGR valve, whereby the air plenum is filled with inert gas, the possible fire is deprived of oxygen and the fire is extinguished becomes.
- a heating capacity in the air collector is determined as a function of a determined value of the differential variable and/or a determined combustion quantity.
- the heat output can be calculated directly using the calorific value and the amount burned.
- an assumption about the calorific value may be necessary. Since the exact composition of the fuel is not known in the exemplary embodiment, pure carbon is assumed here, which is sufficient in relation to the accuracy required.
- suitable substitute reactions for adapting an engine charge can be selected and/or taken directly or indirectly.
- a danger threshold which can be stored, for example, in the engine control system, in particular in the detection means
- an instruction to the driver to stop immediately and/or switch off can be given, for example the internal combustion engine take place.
- a temperature in particular a temperature increase compared to a model-based temperature value for the operating state of the internal combustion engine under consideration, determined in the air collector.
- the temperature increase can be calculated directly with the help of the air mass flow.
- suitable substitute reactions for adapting an engine charge can be selected and/or taken directly or indirectly.
- a suitability and/or a scope of required substitute reactions for the adaptation can be determined and/or the corresponding substitute reactions can be taken to the required extent.
- a substitute reaction for adapting an engine charge is selected and/or taken as a function of a determined value of the difference variable or a variable determined as a function thereof.
- the intake system 4 has a fresh air duct 8 , a charge air cooler 10 , a throttle valve 12 and an air collector 14 .
- the high-pressure compressor and the high-pressure turbine of the exhaust gas turbocharger 22 can each be bypassed by means of a switchable bypass.
- a temperature sensor for measuring a pre-throttle temperature T21 in the fresh air duct is arranged between the intercooler 10 and the throttle valve 12 .
- a pressure sensor for measuring a boost pressure p22 is arranged in the air collector 14.
- the method is carried out again at time t n after a predetermined time interval At has elapsed.
- T-nAGR EGR mixture temperature hs measured fuel-air ratio lt theoretical, model-based determined fuel-air ratio
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021104061.2A DE102021104061B3 (de) | 2021-02-22 | 2021-02-22 | Detektion eines Abbrands in einer Sauganlage |
| PCT/EP2022/051469 WO2022175021A1 (de) | 2021-02-22 | 2022-01-24 | Detektion eines abbrands in einer sauganlage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4295023A1 true EP4295023A1 (de) | 2023-12-27 |
Family
ID=80122854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22701378.6A Pending EP4295023A1 (de) | 2021-02-22 | 2022-01-24 | Detektion eines abbrands in einer sauganlage |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4295023A1 (de) |
| KR (1) | KR102745839B1 (de) |
| DE (1) | DE102021104061B3 (de) |
| WO (1) | WO2022175021A1 (de) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3827978A1 (de) | 1987-11-10 | 1989-05-18 | Bosch Gmbh Robert | Verfahren und vorrichtung fuer stetige lambdaregelung |
| JPH03134238A (ja) * | 1989-10-18 | 1991-06-07 | Nippondenso Co Ltd | エンジン用燃料噴射制御装置 |
| DE19501458B4 (de) | 1995-01-19 | 2009-08-27 | Robert Bosch Gmbh | Verfahren zur Adaption der Warmlaufanreicherung |
| WO2007098780A1 (de) | 2006-02-28 | 2007-09-07 | Bayerische Motoren Werke Aktiengesellschaft | Verfahren zur regelung des kraftstoff-luft-gemisches bei einer verbrennungsmashine |
| DE102008040737A1 (de) * | 2008-07-25 | 2010-01-28 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Dynamiküberwachung einer Breitband-Lambdasonde |
| DE102009028111A1 (de) | 2009-07-30 | 2011-02-03 | Robert Bosch Gmbh | Verfahren zum Schutz einer Brennkraftmaschine |
| DE102015011867B4 (de) | 2015-09-10 | 2018-10-04 | Audi Ag | Verfahren zum Betreiben einer Antriebseinrichtung sowie entsprechende Antriebseinrichtung |
| DE102016211232A1 (de) | 2016-06-23 | 2017-12-28 | Robert Bosch Gmbh | Verfahren zum Erkennen von Rußablagerungen in einem Lufteinlassbereich eines Verbrennungsmotors |
| DE102018201683B4 (de) | 2018-02-05 | 2025-05-08 | Bayerische Motoren Werke Aktiengesellschaft | Verfahren zur Bestimmung einer Leckage in einer Ansaugluftführung eines Verbrennungsmotors |
| DE102018126692B4 (de) * | 2018-10-25 | 2026-03-05 | Bayerische Motoren Werke Aktiengesellschaft | Verfahren zur Erkennung einer Verkokung im Einlasstrakt eines Verbrennungsmotors mit Kraftstoffdirekteinspritzung |
| DE102018126693B4 (de) * | 2018-10-25 | 2026-02-19 | Bayerische Motoren Werke Aktiengesellschaft | Verfahren zur Erkennung einer Verkokung im Einlasstrakt eines Verbrennungsmotors |
-
2021
- 2021-02-22 DE DE102021104061.2A patent/DE102021104061B3/de active Active
-
2022
- 2022-01-24 EP EP22701378.6A patent/EP4295023A1/de active Pending
- 2022-01-24 KR KR1020237018111A patent/KR102745839B1/ko active Active
- 2022-01-24 WO PCT/EP2022/051469 patent/WO2022175021A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| KR102745839B1 (ko) | 2024-12-24 |
| WO2022175021A1 (de) | 2022-08-25 |
| DE102021104061B3 (de) | 2022-07-07 |
| KR20230096081A (ko) | 2023-06-29 |
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