WO2008009499A1 - Verfahren und vorrichtung zur diagnose der zylinderselektiven ungleichverteilung eines kraftstoff-luftgemisches, das den zylindern eines verbrennungsmotors zugeführt wird - Google Patents
Verfahren und vorrichtung zur diagnose der zylinderselektiven ungleichverteilung eines kraftstoff-luftgemisches, das den zylindern eines verbrennungsmotors zugeführt wird Download PDFInfo
- Publication number
- WO2008009499A1 WO2008009499A1 PCT/EP2007/054896 EP2007054896W WO2008009499A1 WO 2008009499 A1 WO2008009499 A1 WO 2008009499A1 EP 2007054896 W EP2007054896 W EP 2007054896W WO 2008009499 A1 WO2008009499 A1 WO 2008009499A1
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- WIPO (PCT)
- Prior art keywords
- internal combustion
- combustion engine
- cylinder
- fuel
- value
- Prior art date
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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
- F02D41/14—Introducing closed-loop corrections
-
- 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
- F02D41/008—Controlling each cylinder individually
- F02D41/0085—Balancing of cylinder outputs, e.g. speed, torque or 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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating 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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1497—With detection of the mechanical response of the engine
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/32—Controlling fuel injection of the low pressure type
- F02D41/34—Controlling fuel injection of the low pressure type with means for controlling injection timing or duration
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Definitions
- the invention relates to a method and a device for diagnosing the unequal distribution of a fuel-air mixture, which is supplied to the individual cylinders of an engine formed with a plurality of cylinders, according to the preamble of the independent claims 1 and 8.
- Internal combustion engines for example, have four or more cylinders, the injected fuel amount and thus the formed fuel-air ratio between the individual cylinders may be different. This is essentially due to the fact that the injection valves used, in particular those which are controlled by a piezoelectric actuator, have different manufacturing tolerances and are also subject to stronger aging influences.
- lambda probe in gasoline engines for determining the exhaust gas composition, a so-called lambda probe is used.
- the lambda probe is usually installed in the exhaust pipe close to the engine and upstream of the catalytic converter. With the lambda probe, a residual oxygen content in the exhaust gas is determined. Depending on the level of the remaining oxygen content, more or less fuel is injected into the cylinders of the internal combustion engine or a corresponding control valve for returning the exhaust gas into the combustion chamber is controlled. In this way, only an average exhaust gas value can be set for the internal combustion engine, but not for a single cylinder.
- Another problem is also that the volume of an exhaust bank due to the small distance between the individual cylinders to the catalyst is relatively low, thus resulting in a smaller mixing distance for the exhaust gas than in a remote engine arrangement of the catalyst. As a result, the influence of an inequality in the supply of the fuel-air mixture to the individual cylinders has a particularly strong effect.
- a fuel diagnosis (FSD, Fuel System Diagnosis) is carried out on the basis of an adaptation value determined by a lambda controller.
- FSD Fuel System Diagnosis
- the adaptation value of each exhaust bank is monitored. If the adaptation value exceeds a predefined limit over a certain period of time, an error is entered for the affected exhaust gas bank. From the error message, however, only recognizable that a fuel or an air error is present at the affected exhaust bank.
- the actual cause of the detected deviation can not be localized. For example, a defective fuel injector trigger an error entry, but the injector itself could not be clearly detected as a source of error.
- the object of the invention is to improve the diagnosis of the unequal distribution of a fuel-air ratio with regard to the exhaust emissions in the case of an internal combustion engine.
- This object is achieved with the features of the independent claims 1 and 8.
- the inventive method or the device for diagnosing the unequal distribution of a fuel-air mixture which is supplied to the individual cylinders of an internal combustion engine, with the characterizing features of the independent claims 1 and 8, there is the advantage that the unequal distribution of the fuel Air mixture is determined individually for each cylinder of the internal combustion engine. Therefore, it is considered to be particularly advantageous that the determination of the unequal distribution is carried out as a function of the current operating mode of the internal combustion engine. In this case, for example, the ⁇ value of the exhaust gas is detected as a function of the operating mode and used to assess the unequal distribution.
- a rough running of the internal combustion engine is detected and from this an individual value is determined individually for the individual cylinder.
- the determined values are compared with a predetermined limit value.
- a corresponding error message is entered and stored for the cylinder concerned in an error memory of the motor vehicle.
- Error entry was initiated. For example, it is very easy to detect a defective injection valve in this way if the error is due to e.g. was detected when exceeding the predetermined limit value for the exhaust emission.
- the measures listed in the dependent claims advantageous refinements and improvements of the independent claims 1 and 8 method and the device are given. It is considered advantageous that the ⁇ value of the exhaust gas is determined in a homogeneous operation of the internal combustion engine. With the ⁇ value can be easily determined, for example, if the injection valve the affected cylinder works within the specified tolerances.
- a further advantageous alternative solution is seen in that, in a combustion engine operating in stratified operation, the rough running is analyzed. To determine the uneven running, the segment time is measured on a crankshaft and evaluated accordingly. In this way it can be determined very easily whether, for example, the air supply for the affected cylinder is within the predetermined tolerance limits.
- the fuel quantity to be injected for the cylinder concerned be corrected so that the predetermined limit value is maintained again during a subsequent injection.
- a further aspect of the invention consists in that a visual and / or audible error message is output in the case of repeated and unsuccessful correction of the affected cylinder.
- a visual and / or audible error message is output in the case of repeated and unsuccessful correction of the affected cylinder.
- both the driver of the vehicle can be informed about the current fault in his internal combustion engine.
- the specialist workshop obtains reliable information about the current error, so that it can advantageously close directly on the cause of the error and thus can easily fix the error.
- the fuel supply to this cylinder is limited to a maximum or minimum value. This prevents that, for example, a drastic deterioration of the exhaust emissions can occur and the environment is unnecessarily burdened.
- an exhaust gas probe (lambda probe), which is already present on the vehicle, analyzes the exhaust gas individually for each cylinder and outputs a corresponding emission value to a corresponding control device. Since today's vehicles are already equipped with an exhaust gas probe, their measurement data can also be used for the use of the invention in an advantageous manner.
- the segment time is determined and output for each cylinder.
- the segment time is determined in a very simple way with a tachometer.
- this may be a Hall sensor.
- FIG. 1 shows a block diagram with an internal combustion engine operating in homogeneous operation.
- FIG. 2 shows a block diagram of an internal combustion engine operating in stratified mode
- FIG. 3 shows a first flow chart
- FIG. 4 shows a second flowchart.
- the fuel is injected into the combustion chamber of a cylinder in a gasoline engine operated with direct fuel injection in such a way that a complete mixing results.
- This operating state is set in particular with a high load requirement.
- the "shift operation" mode is achieved when the fuel is injected into the combustion chamber in such a way that stratification of the fuel-air mixture results.
- the aim is that the fuel-enriched air layer is formed in the vicinity of the ignition electrode. This operation is aimed especially at low load, idle and overrun.
- the fuel injectors in part have large manufacturing tolerances and also depend on the aging of the mechanical parts, in particular those of a piezoelectric actuator, results in the fuel-air ratio, a partially large unequal distribution over the individual cylinders.
- different compensation methods are used, depending on the current engine operating mode. For example, in homogeneous engine operation, an equality function CILC (Cylinder Individual Lambda Control) is used. This equality function is based on measured values of an exhaust gas probe (lambda probe).
- an internal combustion engine operating in staggered mode uses an equalization function CYBL (cylinder balancing via engine roughness).
- CYBL cylinder balancing via engine roughness
- the running function of the internal combustion engine is checked with the aid of this function. Deviations are learned, compensated and stored in a control unit. In the case of a large unequal distribution and no compensation by a suitable function, this would lead to a massive emission deterioration and even to a noticeable driving comfort loss.
- the quantity of fuel to be injected is corrected in such a way that the predetermined limit value is maintained during a subsequent injection. If this is not the case, then a visual and / or audible error message. In the case of unsuccessful attempts at correction, it is to limit the fuel supply to the cylinder concerned to a maximum or minimum value.
- Figure 1 shows a block diagram of a device according to the invention, with which a diagnosis can be carried out for the unequal distribution of the fuel-air mixture via the individual cylinders of an internal combustion engine.
- Figure 1 shows a schematic representation of an internal combustion engine 1, which is formed with four cylinders 2. The internal combustion engine 1 is formed with a direct injection of the fuel.
- the number of cylinders 2 is not essential to the invention.
- the number of cylinders can be arbitrary and depends on the design of the internal combustion engine. 1
- an Otto engine is preferably used, which can be operated with gasoline or gas.
- the internal combustion engine 1 is provided with an injection system in which a separate fuel injector (injection valve) is provided for each cylinder.
- injection valve injection valve
- the quantity of fuel to be injected can be metered individually for each cylinder 1, depending on the activation of the corresponding fuel injector.
- the air supply to form the fuel-air mixture via an intake tract (not shown in Figure 1), which can be controlled by means of a throttle valve depending on the load requirement.
- the individual cylinders 2 of the internal combustion engine 1 are connected on the exhaust gas side to an exhaust bank 16, so that when the exhaust valve of the individual cylinder 2 is open, the burned fuel-air mixture can be removed as exhaust gas.
- four cylinders 2 are guided to an exhaust bank 16.
- a catalytic converter 5 catalytic converter
- the catalyst 5 is preferably arranged close to the engine.
- an exhaust gas probe 3 is arranged in front of the catalytic converter 5 in the exhaust gas bank 16.
- the exhaust gas probe 3 is arranged so that it can detect the exhaust gas flow discharged from the cylinders 2. In this case, the exhaust gas probe 3 measures the residual oxygen content in the exhaust gas and delivers a corresponding lambda value ( ⁇ value) to a program-controlled computing unit 15.
- a program-controlled computing unit 15 has at least the following devices: a device 7 for detecting the cylinder-selective lambda deviations, a diagnostic device 8 for the diagnosis of the individual cylinder deviations and an error memory 9.
- the lambda value determined by the exhaust gas probe 3 corresponds to the exhaust gas which is conducted into the exhaust gas bank 16 by the individual cylinders 2. For this exhaust gas flow, an average value is thus measured for the lambda value, which is usually used in the global lambda control for controlling the fuel injection.
- this global mean value formation of the lambda value does not suffice. Rather, it is proposed according to the invention that for each cylinder 2, a lambda value or a cylinder-specific deviation from the predetermined limit value is selectively determined. This cylinder-specific deviation is then compared with a predetermined limit value. When exceeding the predetermined limit value, a defective fuel injector of the affected cylinder 2 can then be detected in a simple manner as the cause of the error.
- determining the cylinder-selective lambda value or its deviation it is assumed that each cylinder 2 has a per se known individual deviation, which deviates more or less from the mean value.
- the deviation of the lambda value from the mean value is thus calculated for each cylinder 2.
- the open-loop method the previously determined deviations of the lambda value in the diagnostic device 8 are analyzed and compared with a predetermined limit value. If the limit value is exceeded, then a cylinder-specific error entry takes place in the error memory 9.
- the previously determined deviations from the mean lambda value in the diagnostic device 8 are compensated.
- the obtained adaptation values are then analyzed and compared with a corresponding adaptation limit value. If the predetermined adaptation limit value is exceeded, an error entry in the error memory 9 is carried out individually for each cylinder 2 if necessary.
- the specified limit value is dependent on the current operating point of the internal combustion engine 1.
- the filling differences are of comparable magnitude over the entire characteristic map, so that this influence can be neglected in many cases.
- FIG 2 shows an embodiment of the invention, in which the internal combustion engine 1 operates in stratified operation.
- the exhaust gas of an exhaust gas probe is not used.
- a speed sensor 10 is used, which is formed for example in the form of a Hall sensor.
- the speed sensor 10 is arranged in the region of a flywheel 4 of the internal combustion engine 1, which is mounted on a crankshaft and is driven by the crankshaft.
- a plurality of teeth 4 a are arranged, which are scanned by the rotational speed sensor 10.
- the speed sensor 10 thus detects a segment time measured on the rotating flywheel 4 between two adjacent teeth 4a. The segment time thus changes with the speed of the rotating flywheel 4.
- the segment times determined by the rotational speed sensor 10 are transmitted to a device 11 of the arithmetic unit 15 in a manner similar to that described above with reference to FIG.
- the device 11 can thus selectively calculate the runtime caused by the individual cylinders 2 over the segment time.
- the time interval between in each case two adjacent teeth 4a of the shrink disk 4 is measured and compared with subsequent segment times. If the individual segment times vary according to the Belwellen ein the predetermined values or lie within predetermined limits, then the engine runs around and there is no rough running. If, on the other hand, deviating segment times occur, then there is a corresponding uneven running. Since the segment times are influenced by the ignition of the fuel-air mixture in the individual cylinders and the cylinders are ignited sequentially according to a predetermined scheme, a defective cylinder can be detected with the aid of a simple comparison.
- the signal is sampled and an average for the cylinders of the engine is formed.
- the values of the cylinders are compared with the mean value and a deviation from the mean value is recorded.
- Disturbing effects, signal noise, etc. are masked out and the signal is decoupled.
- the diagnosis takes place in the diagnostic device 8. Only when, after repeated measurements, it is determined that the running noise is still above the specified limit value, is a corresponding error entry made in the fault memory 9 for the cylinder concerned.
- the determination of the uneven running is used in open or in closed loop mode. In this case, an adaptation function is created or adjusted for the rough running.
- the further process proceeds analogously to the process indicated in FIG.
- FIGS. 3 and 4 each show a flowchart for an exemplary embodiment according to the invention.
- the internal combustion engine is in a homogeneous operation.
- the program starts in position 20 and checks in position 21 if there is a homogeneous operation. If this is not the case, then in item 22 it is assumed that there is a stratified operation. This process will be explained in more detail later in FIG. If, on the other hand, homogeneous operation has been detected in item 21, then item 23 inquires whether, in the case of closed-loop control, the lambda-based control (CILC, Cylinder Individual Lambda Control) is present or whether an adap- tation with an adaptation function is to be performed. If this is the case, then in position 24 the CILC adaptation values are compared with the preset limit value. If there is an exceeding of the specified limit value for a single cylinder, a corresponding error entry takes place in position 25 for the cylinder concerned.
- CILC Lambda-based control
- Figure 4 shows a flow chart for another exemplary embodiment of the invention in which the engine is in the stratified engine mode.
- the program After it has been determined in position 22 according to FIG. 3 that there is a stratified operation, the program starts in position 30 of FIG. 4 and checks in position 31 whether the smooth running based equalization function CYBL_ER control (cylinder balancing via engine roughness) is used or not whether the adaptation function is in operation in closed-loop mode. If this is the case, then it is queried in position 33 whether the CYBL_ER adaptation values have exceeded the predetermined limit value. If this is the case, then a corresponding error entry is made for the respective cylinder in position 34.
- CYBL_ER control cylinder balancing via engine roughness
- the program jumps to position 32 and checks whether the CYBL ER measured variables, ie whether the segment times have exceeded the specified tolerance limits , If this is the case, then in position 35 for the affected cylinder again a corresponding error entry.
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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)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/302,604 US8103430B2 (en) | 2006-07-21 | 2007-05-21 | Method and device for the diagnosis of the cylinder-selective uneven distribution of a fuel-air mixture fed to the cylinders of an internal combustion engine |
JP2009513639A JP2009540181A (ja) | 2006-07-21 | 2007-05-21 | 内燃機関のシリンダへ供給される燃料空気混合気の不均一分布の診断方法および燃料空気混合気の不均一分布の診断装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006033869A DE102006033869B3 (de) | 2006-07-21 | 2006-07-21 | Verfahren und Vorrichtung zur Diagnose der zylinderselektiven Ungleichverteilung eines Kraftstoff-Luftgemisches, das den Zylindern eines Verbrennungsmotors zugeführt wird |
DE102006033869.3 | 2006-07-21 |
Publications (1)
Publication Number | Publication Date |
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WO2008009499A1 true WO2008009499A1 (de) | 2008-01-24 |
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ID=38336900
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2007/054896 WO2008009499A1 (de) | 2006-07-21 | 2007-05-21 | Verfahren und vorrichtung zur diagnose der zylinderselektiven ungleichverteilung eines kraftstoff-luftgemisches, das den zylindern eines verbrennungsmotors zugeführt wird |
Country Status (5)
Country | Link |
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US (1) | US8103430B2 (de) |
JP (1) | JP2009540181A (de) |
KR (1) | KR20090016686A (de) |
DE (1) | DE102006033869B3 (de) |
WO (1) | WO2008009499A1 (de) |
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WO2012055680A1 (de) * | 2010-10-25 | 2012-05-03 | Robert Bosch Gmbh | Verfahren zur überwachung einer adaption einer einspritzzeit eines einspritzventils einer brennkraftmaschine |
WO2012062402A1 (de) * | 2010-11-11 | 2012-05-18 | Daimler Ag | Verfahren zur korrektur eines luft-kraftstoff-gemisch-fehlers |
WO2012062437A1 (de) * | 2010-11-11 | 2012-05-18 | Daimler Ag | Verfahren zur bestimmung einer art eines luft-kraftstoff-gemisch-fehlers |
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JP5471864B2 (ja) * | 2010-06-11 | 2014-04-16 | いすゞ自動車株式会社 | 内燃機関の燃焼診断装置 |
US8639434B2 (en) | 2011-05-31 | 2014-01-28 | Trimble Navigation Limited | Collaborative sharing workgroup |
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DE102011086064B4 (de) * | 2011-11-10 | 2022-10-06 | Robert Bosch Gmbh | Verfahren zur Bestimmung eines Füllungsunterschieds in Zylindern einer Brennkraftmaschine, Betriebsverfahren und Recheneinheit |
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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 |
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- 2007-05-21 KR KR1020087029487A patent/KR20090016686A/ko not_active Application Discontinuation
- 2007-05-21 WO PCT/EP2007/054896 patent/WO2008009499A1/de active Application Filing
- 2007-05-21 US US12/302,604 patent/US8103430B2/en not_active Expired - Fee Related
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012055680A1 (de) * | 2010-10-25 | 2012-05-03 | Robert Bosch Gmbh | Verfahren zur überwachung einer adaption einer einspritzzeit eines einspritzventils einer brennkraftmaschine |
CN103154484A (zh) * | 2010-10-25 | 2013-06-12 | 罗伯特·博世有限公司 | 用于对内燃机喷射阀的喷射时间的适配进行监视的方法 |
KR101829491B1 (ko) | 2010-10-25 | 2018-02-14 | 로베르트 보쉬 게엠베하 | 내연기관의 분사 밸브의 분사 시간의 적응을 모니터링하는 방법 |
WO2012062402A1 (de) * | 2010-11-11 | 2012-05-18 | Daimler Ag | Verfahren zur korrektur eines luft-kraftstoff-gemisch-fehlers |
WO2012062437A1 (de) * | 2010-11-11 | 2012-05-18 | Daimler Ag | Verfahren zur bestimmung einer art eines luft-kraftstoff-gemisch-fehlers |
Also Published As
Publication number | Publication date |
---|---|
KR20090016686A (ko) | 2009-02-17 |
US20100286892A1 (en) | 2010-11-11 |
DE102006033869B3 (de) | 2008-01-31 |
JP2009540181A (ja) | 2009-11-19 |
US8103430B2 (en) | 2012-01-24 |
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