WO2017036683A1 - Verfahren und vorrichtung zum erkennen eines fehlers beim betrieb einer brennkraftmaschine - Google Patents
Verfahren und vorrichtung zum erkennen eines fehlers beim betrieb einer brennkraftmaschine Download PDFInfo
- Publication number
- WO2017036683A1 WO2017036683A1 PCT/EP2016/067884 EP2016067884W WO2017036683A1 WO 2017036683 A1 WO2017036683 A1 WO 2017036683A1 EP 2016067884 W EP2016067884 W EP 2016067884W WO 2017036683 A1 WO2017036683 A1 WO 2017036683A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fuel
- air
- values
- internal combustion
- combustion chamber
- Prior art date
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
- F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
-
- 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
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
- F02D41/3017—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used
- F02D41/3023—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used a mode being the stratified charge spark-ignited mode
- F02D41/3029—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used a mode being the stratified charge spark-ignited mode further comprising a homogeneous charge spark-ignited mode
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/3094—Controlling fuel injection the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder
Definitions
- the present invention relates to a method for detecting an error
- Combustion chamber can be closed only on a fault in the operation of the internal combustion engine and thus the control of the fuel injectors can be adjusted, the method proposed, a recognition of the nature of the error during operation of the internal combustion engine is possible. It should be noted that a predetermined amount of fuel is discontinued by appropriate driving times of the fuel injectors. In case of faulty flow through the fuel injector but not the desired amount of fuel is sold. In particular, a different function of a respective fuel injector and a functional restriction in the air supply to the combustion chamber can be distinguished as different types of error.
- the distribution of the fuel quantity comprises a pure intake pipe injection and a pure direct injection.
- differences in the air-fuel ratio in the two combustion cycles can be detected particularly clearly.
- a function restriction of a fuel injector of the injection type belonging to the deviating value is concluded.
- there is a restriction on the function of the fuel injector for the intake manifold injection if the value of the air / fuel ratio deviates noticeably from a comparison value or desired value only with pure intake manifold injection, but not with pure direct injection.
- the first threshold can be suitably selected. For example, this threshold may be used to account for any measurement inaccuracies.
- a functional restriction is only concluded if the two values deviate from one another by more than a second threshold value.
- the second threshold value can likewise be used to take account of any measurement inaccuracies, in particular it can be avoided that an error is concluded when only one of the two values deviates by more than the first threshold value, but only slightly deviate from one another , In this way, a very simple detection of a functional restriction of a fuel! possible.
- the function restriction of the fuel injector comprises a defect, a partial defect or a contamination as different types of functional restriction, wherein the type of deviation is inferred in particular from the amount of deviation of the relevant value from the associated comparison value.
- the type of deviation is inferred in particular from the amount of deviation of the relevant value from the associated comparison value.
- suitable deviations can be defined which, for example, can be determined by means of test measurements.
- the relevant fuel Less used or shut down njektor to prevent any further problems, such as overheating of a catalyst.
- a functional restriction for an air supply, in particular an air mass metering, for the combustion chamber is concluded. It is made use of that the air supply of the internal combustion engine is used for both types of injection. If a deviation occurs in both cases, then it can be assumed that the error lies in the shared system, since the same errors are very unlikely with two different fuel injectors. Too high an amount of air supplied to the combustion chamber would lead to an excessively high proportion of air and a too small amount of air supplied to the combustion chamber would lead to an insufficient proportion of air of the mixture in the combustion chamber.
- Threshold can be chosen appropriately. For example, it may be used to account for any measurement inaccuracies, as previously mentioned. Advantageously, it can also be provided that only then
- Function restriction is closed when the two values differ by less than a third threshold.
- the third threshold value can also be used to take account of any measurement inaccuracies, in particular it can be avoided that an error is concluded if both values deviate markedly from the comparison value but would not overestimate the measurement inaccuracy.
- a possible deviation of the two values due to the different injection type and, if appropriate, associated further effects, such as valve control times can thus be taken into account. So that's one way Very simple detection of a functional restriction of the air supply possible. In particular, it can be concluded that a malfunction of an air mass meter. It is advantageous if the ratio of the introduced into the combustion chamber
- Air quantity is determined for introduced into the combustion chamber fuel amount by means of a lambda probe, a speed fluctuation in the relevant combustion cycle and / or a pressure sensor in the combustion chamber.
- a lambda probe is present, for example, in an internal combustion engine anyway.
- a speed fluctuation is caused, for example, if too low a torque is generated due to a too small amount of fuel in the combustion chamber during combustion.
- the pressure sensor With the pressure sensor, a pressure of the air-fuel mixture in the combustion chamber can be determined, which pressure is influenced by the proportion of fuel in the mixture.
- the ratio can usually be determined with sufficient accuracy by one of the methods, but a use of several of these methods is, for example, more accurate.
- the type of error is determined for each combustion chamber of the internal combustion engine.
- each of the fuel injectors of the internal combustion engine can be checked.
- the ratios of each introduced into the combustion chambers air volumes are determined to each introduced into the combustion chambers fuel quantities by means of a lambda probe for a plurality of combustion chambers
- the corresponding ratios of the individual combustion chambers taking into account valve timing, gas transit times and / or reaction times of lambda Probe determined.
- the proposed method can also be carried out if only one lambda probe is provided for a plurality of combustion chambers, ie not a separate lambda probe for each combustion chamber.
- deviations of the values from the comparison values and / or from one another are relative or, in particular if at least substantially the same amount of fuel and air quantity are specified in both combustion cycles, absolutely determined.
- any incorrect results which, for example, at different fuel quantities for the two combustion cycles, for example. At different load requirements to the internal combustion engine, can be avoided.
- absolute deviations are used, which can be achieved more accurate results in the rule.
- An arithmetic unit according to the invention e.g. a control unit, in particular an engine control unit, of a motor vehicle is, in particular programmatically, configured to perform a method according to the invention.
- Suitable data carriers for providing the computer program are in particular magnetic, optical and electrical memories, such as e.g. Hard drives, flash memory, EEPROMs, DVDs, etc. It is also possible to download a program via computer networks (Internet, intranet, etc.).
- Figures 1 a and 1 b show schematically two internal combustion engines, which can be used for a method according to the invention.
- Figure 2 shows schematically a cylinder of an internal combustion engine, which can be used for a method according to the invention.
- FIG. 3 shows possible types of errors in a method according to the invention in a preferred embodiment.
- FIG. 4 schematically shows a sequence of a method according to the invention in a preferred embodiment.
- FIG. 1 a shows schematically and simplified an internal combustion engine 100, which can be used for a method according to the invention.
- the internal combustion engine 100 has four combustion chambers 103 and a suction tube 106, which is connected to each of the combustion chambers 103.
- the intake manifold 106 has, for each combustion chamber 103, a fuel injector 107 which is arranged in the respective section of the intake manifold just before the combustion chamber.
- the fuel injectors 107 thus serve a port injection.
- each combustion chamber 103 has a fuel injector 1 1 1 for a direct injection.
- FIG. 1 b schematically and simplified shows a further internal combustion engine 200, which are used for a method according to the invention can.
- the internal combustion engine 100 has four combustion chambers 103 and a suction tube 206, which is connected to each of the combustion chambers 103.
- the intake manifold 206 has in this case for all combustion chambers 103 a common fuel injector 207, which is arranged in the intake manifold, for example, shortly after a throttle valve, not shown here.
- the first fuel injector 207 thus serves for a port injection.
- each combustion chamber 103 has a fuel injector 1 1 1 for a direct injection. Both shown internal combustion engines 100 and 200 thus have a so-called.
- Dual system i. via intake manifold injection and direct injection.
- the difference is only in the type of intake manifold injection. While, for example, the intake manifold injection shown in FIG. 1 a permits a fuel metering individually for each combustion chamber, as can be used, for example, for higher-value internal combustion engines, the port injection shown in FIG. 1 b is simpler in design and control.
- the two internal combustion engines shown may in particular be gasoline engines.
- a cylinder 102 of the internal combustion engine 100 is schematic and simplified, but in more detail than shown in FIG. 1 a.
- the cylinder 102 has a
- Combustion chamber 103 which is increased or decreased by movement of a piston 104.
- the present internal combustion engine may in particular be a gasoline engine.
- the cylinder 102 has an intake valve 105 for receiving air or a fuel-air
- Mixture into the combustion chamber 103 admit.
- the air is supplied via the intake manifold 106 as part of an air supply to which the fuel injector 107 is located. Sucked air is admitted via the inlet valve 105 into the combustion chamber 103 of the cylinder 102.
- a throttle valve 12 in the air supply system serves to set the required air mass flow into the cylinder
- an air mass meter 120 for example in the form of a hot film air mass meter, the amount of air to be introduced through the suction pipe 106 into the combustion chamber 103 can be determined.
- the internal combustion engine can be operated in the course of a port injection. With the aid of the fuel injector 107, fuel is injected into the intake manifold 106 in the course of this intake manifold injection, so that an air-fuel mixture forms there, which is introduced into the combustion chamber 103 of the cylinder 102 via the intake valve 105.
- a pressure sensor 122 is provided, by means of which a pressure of an air-fuel mixture located in the combustion chamber can be determined.
- the internal combustion engine can also be operated in the course of a direct injection.
- the fuel injector 1 1 1 is attached to the cylinder 102 to inject fuel directly into the combustion chamber 103.
- the air-fuel mixture required for combustion is formed directly in the combustion chamber 103 of the cylinder 102.
- the cylinder 102 is further provided with an ignition device 110 for generating a spark to start combustion in the combustion chamber 103.
- Combustion exhaust gases are expelled from the cylinder 102 via an exhaust pipe 108 after combustion.
- the ejection is dependent on the opening of an exhaust valve 109, which is also disposed on the cylinder 102.
- Inlet and exhaust valves 105, 109 are opened and closed to perform a four-stroke operation of the engine 100 in a known manner.
- a lambda probe 121 is provided, by means of which a residual oxygen content in the exhaust gas can be determined, from which in turn can be calculated back to an air-fuel ratio in the combustion chamber.
- the internal combustion engine 100 may be operated by direct injection, with intake manifold injection or in a mixed operation. This allows the selection of the optimum operating mode for operating the internal combustion engine 100 depending on the current operating point. For example, the engine 100 may be operated in a port injection mode when operated at a low speed and a low load, and may be operated in a direct injection mode when operating at a high speed and high load is operated. Over a large operating range, however, it makes sense to operate the internal combustion engine 100 in a mixed operation, in which the fuel chamber to be supplied to the fuel quantity 103 proportionately supplied by intake manifold injection and direct injection.
- a computing unit designed as a control unit 1 15 for controlling the internal combustion engine 100 is provided.
- the control unit 15 can operate the internal combustion engine 100 in the direct injection, the intake manifold injection or the mixed operation. Furthermore, the control unit 1 15 can also detect values from the air mass meter 120, from the lambda probe 121 and from the pressure sensor 122.
- the operation of the internal combustion engine 100 explained in more detail with reference to FIG. 2 can also be transferred to the internal combustion engine 200 according to FIG. 1 b, with the only difference that only one common fuel injector is provided for all combustion chambers or cylinders. When a port injection or in a mixed operation is therefore the only fuel! driven in the suction tube.
- FIG. 3 shows possible types of errors in a method according to the invention in a preferred embodiment.
- an air-fuel ratio V is plotted on the high-value axis.
- Vs is a comparison value present for both values, i.
- both by means of pure intake manifold injection as well as the values determined by pure direct injection should apply. This can be achieved, for example, by determining the determined values of the air-fuel ratios for the same fuel quantity and air quantity and / or indicating the quantity of fuel to be introduced relative to the fuel.
- Such a comparison value may, for example, be a desired value which is usually to be achieved during an injection process.
- AVi, AV2 and AVß a first, a second and a third threshold are designated.
- the three threshold values can, for example, be selected to be the same size, for example to 5% or 10% of the comparative value. It is understood that the threshold values, depending on the requirement and / or measurement accuracy, can also be chosen differently or differently.
- various values in the form V x , i and V x , 2 are shown, wherein the 1 and 2 are in the index for the type of injection, so in the present case, for example, purely port injection and pure direct injection.
- the x in the index represents the number of the example to be explained.
- the values Vi, i and Vi, 2, ie the intake-air and direct-injection air-fuel ratios, are substantially the same and at the same time both deviate from the comparison value Vs by less than the first threshold AVi.
- the values V2, i and V2,2 are different. In this case, only the value V2.2 deviates from the comparison value Vs by more than the first threshold value AVi, while the value V2, i deviates from the comparison value Vs by less than the first threshold value AVi. Furthermore, however, the two values V2, i and V2.2 differ from each other by more than the second threshold value AV2.
- a functional restriction in the fuel! Njektor which belongs to the value V2,2, in the present case, a fuel injector for direct injection, is present. Since there is a noticeable deviation in the air-fuel ratio only in one of two different types of injection, it can be assumed that there is no error that would affect both types of injection.
- the values Vss.i and V3,2 are different. In this case, only the value Vss.i deviates from the comparison value Vs by more than the first threshold AVi, while the value V3,2 deviates from the comparison value Vs by less than the first threshold ⁇ ⁇ ⁇ .
- This case corresponds to the second case with reversed values, ie here is a function restriction in the intake manifold injection. For the rest, please refer to the comments on the second case. However, in the second and third case, for example, the comparison with the second
- Threshold omitted if a sufficiently good accuracy of the values is present. Then, only due to the deviation, only one of the two values can be closed by more than the first threshold value on a function restriction.
- FIG. 4 schematically shows a sequence of a method according to the invention in a preferred embodiment.
- a step 400 first the air-fuel ratio can be determined with pure intake manifold injection.
- a step 410 the air-fuel ratio can be determined in pure direct injection. It is understood that these two steps can also be reversed in time.
- a type of error that has been present and determined may be output, i. For example, deposited in a control unit memory and / or output as a warning to a driver.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Fuel-Injection Apparatus (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Testing Of Engines (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020187009255A KR20180048964A (ko) | 2015-09-03 | 2016-07-27 | 내연 기관의 작동 중에 오류를 검출하기 위한 방법 및 장치 |
US15/751,408 US20180238259A1 (en) | 2015-09-03 | 2016-07-27 | Method and device for detecting a fault during operation of an internal combustion engine |
CN201680051073.0A CN107923332A (zh) | 2015-09-03 | 2016-07-27 | 用于在内燃机运行时识别故障的方法和装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015216869.7 | 2015-09-03 | ||
DE102015216869.7A DE102015216869A1 (de) | 2015-09-03 | 2015-09-03 | Verfahren zum Erkennen eines Fehlers beim Betrieb einer Brennkraftmaschine |
Publications (1)
Publication Number | Publication Date |
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WO2017036683A1 true WO2017036683A1 (de) | 2017-03-09 |
Family
ID=56550882
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2016/067884 WO2017036683A1 (de) | 2015-09-03 | 2016-07-27 | Verfahren und vorrichtung zum erkennen eines fehlers beim betrieb einer brennkraftmaschine |
Country Status (5)
Country | Link |
---|---|
US (1) | US20180238259A1 (de) |
KR (1) | KR20180048964A (de) |
CN (1) | CN107923332A (de) |
DE (1) | DE102015216869A1 (de) |
WO (1) | WO2017036683A1 (de) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030110845A1 (en) * | 2001-12-12 | 2003-06-19 | Honda Giken Kogyo Kabushiki Kaisha | Failure determination system and method for internal combustion engine and engine control unit |
DE102006040743A1 (de) * | 2006-08-31 | 2008-03-06 | Robert Bosch Gmbh | Verfahren zum Betreiben einer Brennkraftmaschine |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000274296A (ja) * | 1999-03-19 | 2000-10-03 | Unisia Jecs Corp | 内燃機関の燃料噴射制御装置 |
JP4244198B2 (ja) * | 2004-03-15 | 2009-03-25 | トヨタ自動車株式会社 | 内燃機関の燃料噴射制御方法 |
JP4470772B2 (ja) * | 2005-03-18 | 2010-06-02 | トヨタ自動車株式会社 | 内燃機関の状態判定装置 |
DE102008041406B4 (de) * | 2008-08-21 | 2019-07-18 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Diagnose einer Brennkraftmaschine, Computerprogramm und Computerprogrammprodukt |
JP5119216B2 (ja) * | 2009-07-21 | 2013-01-16 | トヨタ自動車株式会社 | 内燃機関の異常診断装置 |
JP5459240B2 (ja) * | 2011-02-25 | 2014-04-02 | トヨタ自動車株式会社 | 内燃機関の故障診断装置 |
JP2012219622A (ja) * | 2011-04-04 | 2012-11-12 | Toyota Motor Corp | 内燃機関の制御装置 |
JP5862296B2 (ja) * | 2011-12-28 | 2016-02-16 | トヨタ自動車株式会社 | ハイブリッド車両 |
JP5862311B2 (ja) * | 2012-01-11 | 2016-02-16 | トヨタ自動車株式会社 | ハイブリッド車両 |
JP5724963B2 (ja) * | 2012-08-01 | 2015-05-27 | トヨタ自動車株式会社 | 内燃機関の診断装置 |
JP5811125B2 (ja) * | 2013-03-27 | 2015-11-11 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
JP5942965B2 (ja) * | 2013-11-22 | 2016-06-29 | トヨタ自動車株式会社 | 内燃機関の制御装置および内燃機関の制御方法 |
US9593637B2 (en) * | 2013-12-05 | 2017-03-14 | Ford Global Technologies, Llc | Method of diagnosing injector variability in a multiple injector system |
DE102015217138A1 (de) * | 2015-09-08 | 2017-03-09 | Robert Bosch Gmbh | Verfahren zum Ermitteln einer Ursache eines Fehlers in einem Einspritzsystem einer Brennkraftmaschine |
-
2015
- 2015-09-03 DE DE102015216869.7A patent/DE102015216869A1/de not_active Withdrawn
-
2016
- 2016-07-27 KR KR1020187009255A patent/KR20180048964A/ko unknown
- 2016-07-27 CN CN201680051073.0A patent/CN107923332A/zh active Pending
- 2016-07-27 WO PCT/EP2016/067884 patent/WO2017036683A1/de active Application Filing
- 2016-07-27 US US15/751,408 patent/US20180238259A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030110845A1 (en) * | 2001-12-12 | 2003-06-19 | Honda Giken Kogyo Kabushiki Kaisha | Failure determination system and method for internal combustion engine and engine control unit |
DE102006040743A1 (de) * | 2006-08-31 | 2008-03-06 | Robert Bosch Gmbh | Verfahren zum Betreiben einer Brennkraftmaschine |
Also Published As
Publication number | Publication date |
---|---|
KR20180048964A (ko) | 2018-05-10 |
DE102015216869A1 (de) | 2017-03-09 |
CN107923332A (zh) | 2018-04-17 |
US20180238259A1 (en) | 2018-08-23 |
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