CN111502848A - Method for determining a correction value for a fuel metering of a fuel injector - Google Patents
Method for determining a correction value for a fuel metering of a fuel injector Download PDFInfo
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- CN111502848A CN111502848A CN202010076255.1A CN202010076255A CN111502848A CN 111502848 A CN111502848 A CN 111502848A CN 202010076255 A CN202010076255 A CN 202010076255A CN 111502848 A CN111502848 A CN 111502848A
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- correction value
- fuel injector
- fuel
- determined
- computer program
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- 238000012937 correction Methods 0.000 title claims abstract description 69
- 239000000446 fuel Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- 238000002485 combustion reaction Methods 0.000 claims abstract description 17
- 230000003068 static effect Effects 0.000 claims abstract description 11
- 238000004590 computer program Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
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
- F02D41/24—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
- F02D41/2464—Characteristics of actuators
- F02D41/2467—Characteristics of actuators for injectors
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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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
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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
- F02D41/24—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
-
- 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
- F02D41/2477—Methods of calibrating or learning characterised by the method used for learning
- F02D41/248—Methods of calibrating or learning characterised by the method used for learning using a plurality of learned values
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0614—Actual fuel mass or fuel injection amount
- F02D2200/0616—Actual fuel mass or fuel injection amount determined by estimation
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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
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
-
- 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
- F02D41/24—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
- F02D41/2441—Methods of calibrating or learning characterised by the learning conditions
- F02D41/2445—Methods of calibrating or learning characterised by the learning conditions characterised by a plurality of learning conditions or ranges
Abstract
A method for determining a correction value for a fuel metering of a fuel injector is described, wherein fuel is injected from a high-pressure reservoir into a combustion chamber by means of the fuel injector, wherein a value is determined which represents a static flow rate through the fuel injector, wherein, during at least one injection event of the fuel injector, a ratio of a pressure difference occurring in the high-pressure reservoir as a result of the injection event to an associated duration which characterizes the injection event is determined. The first correction value for control is found at a low learning speed and the second correction value is found at a high learning speed.
Description
Technical Field
The invention relates to a method for determining a correction value for a fuel metering of a fuel injector by means of which fuel is injected from a high-pressure accumulator into a combustion chamber.
Background
In motor vehicles, very strict limit values are applied in part with regard to the emissions of harmful substances to be observed. In order to comply with current and, in particular, also future emissions or exhaust gas limits, precise metering of fuel, in particular during injection, is crucial.
It should be taken into account here that different tolerances occur during the metering. Such dosing tolerances are typically caused by sample-dependent needle dynamics and sample-dependent static flow rates of the fuel injector. For example, the influence of the needle dynamics can be reduced by mechatronics solutions, such as for example the so-called Control Valve Operation (CVO). In CVO, the actuation time of the fuel injector is adjusted in the sense of regulation, for example over the service life of the motor vehicle. In this case, during the injection, the actuation signal is detected and the opening duration of the valve needle is determined in parallel from the opening and closing times. The actual opening duration of the fuel injector can thus be calculated and readjusted if necessary. DE 102009002593 a1 describes such a method for adjusting the actual opening duration of a valve to a setpoint opening duration.
The error in the static flow rate is caused by tolerances in the geometry of the fuel injector, in particular tolerances in the injection holes of the fuel injector and tolerances in the needle travel. Such errors can hitherto mostly only be corrected globally, that is to say in common for all fuel injectors of the internal combustion engine, for example on the basis of a lambda control or a mixture adaptation.
Furthermore, DE 102015205877 a1 discloses a method by means of which it can be detected whether individual fuel injectors of an internal combustion engine have a deviation in their static flow rate. The ratio between the injected quantity and the opening duration of the injector is referred to as the static flow rate.
The method described in DE 102015205877 a1 is based on the evaluation of rail pressure disturbances during injection. For this purpose, a correction value for the injection is calculated with the aid of the rail pressure disturbance of the individual injections. Here, the correction value is continuously calculated. The learning speed for the correction coefficient decreases as the number of measurement values increases until it converges to a slow level. However, in the case of an injector change or a sudden change in the static flow rate, it is necessary to perform a rapid relearning (Nachlernen) of the correction values.
Disclosure of Invention
According to the invention, a method having the features of claim 1 is proposed. Advantageous embodiments are the subject matter of the dependent claims and the following description.
The present invention is advantageous in that, in a method for determining a correction value for a fuel metering of a fuel injector, a ratio between a pressure difference occurring in a high-pressure accumulator as a result of an injection event and a characteristic duration of the associated injection event is determined during at least one injection event of the fuel injector, wherein a first correction value for the control is determined at a low learning rate and a second correction value is determined at a high learning rate. Due to this procedure, two correction values are available, wherein the first correction value has a high accuracy and ensures a high accuracy of the fuel metering. By means of the second correction value, which has a low accuracy but reacts quickly to changing conditions, errors in the range of the first correction value can be reliably identified.
It is particularly advantageous if an error is detected if the first correction value and the second correction value deviate from one another.
The high accuracy of the first correction value results from the fact that the first correction value for controlling is determined by a large number of representative values. Preferably, for determining the first correction value, an average value is formed over a large number of representative values.
Since the second correction value is determined over a small number of representative values, it is possible to reliably detect an error that occurs suddenly and to initialize a rapid adaptation to the first correction value. For this purpose, the learning speed for determining the first correction value is increased in a particularly advantageous manner if the first correction value and the second correction value deviate from one another. This can be achieved, for example, by: an average is only formed over a significantly smaller number of representative values.
In order to detect a possible replacement of the fuel injector or the installation of one or more new fuel injectors, the second correction value is determined after the internal combustion engine has started.
In a further aspect, the invention relates to a new program code together with processing instructions for programming a computer program that is executable on a controller, in particular source code with compiling and/or linking instructions, wherein the program code generates a computer program for carrying out all the steps of one of the described methods if the program code is converted into an executable computer program, i.e. in particular compiled and/or linked, according to the processing instructions. Such program code can be given, in particular, by source code, which can be downloaded, for example, from a server in the internet.
Drawings
Fig. 1 shows a schematic representation of an internal combustion engine with a common rail system, which is suitable for carrying out the method according to the invention.
Fig. 2 schematically shows a process for determining the actuation time for a fuel injector.
Detailed Description
Fig. 1 schematically shows an internal combustion engine 100, which is suitable for carrying out the method according to the invention. The internal combustion engine 100 comprises, as an example, three combustion chambers or associated cylinders 105. Each combustion chamber 105 is assigned a fuel injector 130, which is in turn connected to a high-pressure accumulator 120, respectively a so-called rail, through which fuel is supplied to the fuel injector. It goes without saying that the method according to the invention can also be implemented in internal combustion engines having any other number of cylinders, for example four, six, eight or twelve cylinders.
Further, the high-pressure reservoir is supplied with fuel from a fuel tank 140 by a high-pressure pump 110. The high-pressure pump 110 is coupled to the internal combustion engine 100 and, more precisely, for example, such that it is driven by the crankshaft of the internal combustion engine or by a camshaft, which is in turn coupled to the crankshaft.
The fuel injectors 130 for metering fuel into the respective combustion chambers 105 are actuated by a computing unit embodied as a motor controller 180. For simplicity, only connections from the motor controller 180 to the fuel injectors 130 are shown, although it is understood that each fuel injector 130 is correspondingly connected to the motor controller. Each fuel injector 130 can be specifically controlled. Furthermore, motor controller 130 is designed to detect the fuel pressure in high-pressure accumulator 120 by means of pressure sensor 190.
The process according to the invention is shown in more detail in fig. 2. Elements already shown in fig. 1 are denoted by corresponding reference numerals. The pressure sensor 190 provides a signal P to a first adapter 200. The first adapter supplies the first correction value K1 to the control unit 210 which controls the fuel injector 130.
Furthermore, the signal P of the pressure sensor 190 reaches the second adapter 220, which also receives the signal S of the starter recognition 240. This second adapter 220 supplies the second correction value K2 to the checking unit 230. The test unit 230 also processes the output signal K1 of the first adapter 200. The verification unit 230 applies the trigger signal T to the first adapter 200 according to the result of the verification or comparison of the values K1 and K2.
The first adapter 200 continuously determines a first correction value K1 for each fuel injector 130. For this purpose, the rail pressure signal P is evaluated. The first correction value K1 is calculated starting from a rail pressure disturbance during injection into the respective fuel injector. The exact correction value K1 is determined by a plurality of measurements. This correction value K1 is then taken into account by the control unit 210 when calculating the control signals for the respective fuel injector. High accuracy is obtained by forming an average over a number of calculated correction values.
In the following, reference is made to the first correction value K1 and the second correction value K2. It is of course relevant here that the correction values for the operating points are correspondingly used here. Different first and second correction values are determined for a plurality of operating points.
After the first correction value K1 has been calculated for the first time after the assembly of the motor vehicle, the first correction value K1 is only tracked very slowly, since the fuel injectors typically change only very slowly over the service life.
This is based on the fact that: the first correction value is calculated only at relatively large time intervals or over a plurality of ascertained measured values. This first correction value K1 is determined, for example, by averaging a large number of measurement points, i.e., the injections. This means that the first correction value for controlling the fuel injector is found at a low learning speed.
However, in actual operation of the internal combustion engine, events may occur which lead to the occurrence of a drastic change in the static flow of one of the fuel injectors. This may be caused, for example, by installing new fuel injectors in the scope of maintenance or by fuel injectors becoming confused between the individual cylinders. Furthermore, the following may occur, namely: the sudden change in static flow rate is caused by impurities in the fuel deposited in the fuel injector. In these cases, it is necessary to immediately recalculate the first correction value K1 for operating the fuel injector.
According to the invention, it is now provided that a second adapter 220 is provided, which, in the same way as the first adapter 200, uses the pressure disturbance as a starting point to determine a second correction value K2. In this case, this second correction value K2 is determined continuously and/or averaged over a small number of measurement points, i.e. injections. This second correction value is found at a higher learning speed than the first correction value.
This second correction value is therefore available after a very short time. This second correction value K2 is compared with the first correction value K1 by the checking means 230. If these two values deviate significantly from each other, the checking means 230 sends a trigger signal T to the first adapter 200 in order for it to retrieve the adapted value.
The error suspicion function is implemented substantially in parallel with the common adapter 200. It is particularly advantageous if this error suspicion function is restarted in each driving cycle. This is triggered by the starter recognition mechanism 240. The learning speed of such error suspicion functions is at a very high level. That is, the second correction value K2 is found very quickly. This fast derived correction value is then compared with the slowly derived first correction value K1. If the difference between the two correction values exceeds a threshold value, the first adapter 200 is triggered accordingly, so that it carries out a fast relearning of the first correction value K1.
In particular, confusingly installed or new fuel injectors can thereby be reliably detected. This measure enables a quick learning of the correction value for correcting the static flow rate when the fuel injector is replaced.
If the second adapter 220 is activated only at start-up or at the beginning of a new driving cycle, only the replacement of the fuel injector can be detected. If this second adapter is permanently in operation, sudden changes in the static flow, for example caused by contamination, can also be detected.
Claims (10)
1. In a method for determining a correction value for the metering of fuel by a fuel injector, wherein fuel is injected from a high-pressure reservoir into a combustion chamber by means of the fuel injector, wherein a value is determined which is representative of a static flow rate through the fuel injector, in at least one injection event of the fuel injector a ratio of a pressure difference occurring in the high-pressure reservoir as a result of the injection event to an associated duration which characterizes the injection event is determined, a first correction value for the control is determined at a low learning rate, and a second correction value is determined at a high learning rate.
2. The method of claim 1, wherein an error is identified if the first correction value and the second correction value deviate from each other.
3. Method according to claim 1 or 2, characterized in that the first correction value for the control is determined from a plurality of representative values.
4. Method according to any one of the preceding claims, characterized in that the second correction value is found by means of a small number of representative values.
5. Method according to any one of the preceding claims, wherein the learning speed for finding the first correction value is increased if the first correction value and the second correction value deviate from each other.
6. Method according to any of the preceding claims, characterized in that the second correction value is found after the starting of the internal combustion engine.
7. Computer program configured for carrying out all the steps of one of the methods according to any one of claims 1 to 6.
8. A machine-readable storage medium on which the computer program according to claim 7 is stored.
9. A controller configured to perform all the steps of one of the methods according to any one of claims 1 to 6.
10. Program code together with processing instructions for programming a computer program that is executable on a controller, wherein the program code produces a computer program according to claim 7 if the program code is converted into an executable computer program according to the processing instructions.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019200903.4 | 2019-01-24 | ||
| DE102019200903.4A DE102019200903A1 (en) | 2019-01-24 | 2019-01-24 | Method for determining a correction value for a fuel metering of a fuel injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111502848A true CN111502848A (en) | 2020-08-07 |
Family
ID=71524650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010076255.1A Pending CN111502848A (en) | 2019-01-24 | 2020-01-23 | Method for determining a correction value for a fuel metering of a fuel injector |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111502848A (en) |
| DE (1) | DE102019200903A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030048792A (en) * | 2001-12-13 | 2003-06-25 | 현대자동차주식회사 | a method for pilot fuel quantity control after injector changed of common rail diesel engine |
| EP2019195A1 (en) * | 2007-07-24 | 2009-01-28 | Robert Bosch GmbH | Method for determining the amount of fuel injected |
| DE102010000916A1 (en) * | 2010-01-14 | 2011-07-21 | Robert Bosch GmbH, 70469 | Method for recognizing exchange of injector arranged in internal combustion engine, involves executing fast Fourier transform for voltage signal of injector of internal combustion engine |
| DE102010029837A1 (en) * | 2010-06-09 | 2011-12-15 | Robert Bosch Gmbh | Method for operating combustion engine of motor car, involves indirectly comparing operating cycle to appropriate individual correction value determined in subsequent operating cycle |
| CN107636283A (en) * | 2015-04-01 | 2018-01-26 | 罗伯特·博世有限公司 | Method and apparatus for obtaining the corrected value for fuel injection amount |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009002593A1 (en) | 2009-04-23 | 2010-10-28 | Robert Bosch Gmbh | Method and control device for operating an actuator-operated valve |
-
2019
- 2019-01-24 DE DE102019200903.4A patent/DE102019200903A1/en active Pending
-
2020
- 2020-01-23 CN CN202010076255.1A patent/CN111502848A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030048792A (en) * | 2001-12-13 | 2003-06-25 | 현대자동차주식회사 | a method for pilot fuel quantity control after injector changed of common rail diesel engine |
| EP2019195A1 (en) * | 2007-07-24 | 2009-01-28 | Robert Bosch GmbH | Method for determining the amount of fuel injected |
| DE102010000916A1 (en) * | 2010-01-14 | 2011-07-21 | Robert Bosch GmbH, 70469 | Method for recognizing exchange of injector arranged in internal combustion engine, involves executing fast Fourier transform for voltage signal of injector of internal combustion engine |
| DE102010029837A1 (en) * | 2010-06-09 | 2011-12-15 | Robert Bosch Gmbh | Method for operating combustion engine of motor car, involves indirectly comparing operating cycle to appropriate individual correction value determined in subsequent operating cycle |
| CN107636283A (en) * | 2015-04-01 | 2018-01-26 | 罗伯特·博世有限公司 | Method and apparatus for obtaining the corrected value for fuel injection amount |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102019200903A1 (en) | 2020-07-30 |
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