CN112049733B - Correction method and device for fuel injection quantity of engine - Google Patents
Correction method and device for fuel injection quantity of engine Download PDFInfo
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- CN112049733B CN112049733B CN202010835177.9A CN202010835177A CN112049733B CN 112049733 B CN112049733 B CN 112049733B CN 202010835177 A CN202010835177 A CN 202010835177A CN 112049733 B CN112049733 B CN 112049733B
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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
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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
- F02D41/008—Controlling each cylinder individually
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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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- 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
Abstract
The invention relates to a method and a device for correcting the fuel injection quantity of an engine, wherein the method comprises the following steps: acquiring working condition information of an engine; identifying that the engine enters a stable working condition according to the working condition information; when the engine enters a stable working condition, calculating angular acceleration difference values corresponding to different working cylinders in the engine; working time corresponding to different working cylinders in the engine is calculated according to the angular acceleration difference; identifying an abnormal working cylinder according to the working time; correcting and compensating the oil injection pulse width of the abnormal working cylinder, and after correcting and compensating the oil injection pulse width of the abnormal working cylinder, recalculating the angular acceleration difference of different working cylinders of the engine until the oil injection quantity of the different working cylinders is consistent; the invention can correct and compensate the fuel injection quantity attenuation of the fuel injector corresponding to the abnormal working cylinder without replacing the whole set of fuel injector, thereby reducing the maintenance cost and having wide application range.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a method and a device for correcting the fuel injection quantity of an engine.
Background
With the popularization of automobile application, the research and development of automobiles are gradually increased, in particular to the research and development of engines, wherein an engine fuel injector is used as a core part of an engine fuel supply system, the engine is opened and closed thousands of times per minute in the working process, and the life cycle needs to reciprocate hundreds of millions of times. The relative movement of the metal piece needs a fuel oil film for lubrication, and the lubrication effects of different types of fuels are different, so that the abrasion condition of the oil injector is also different.
The flow characteristics of individual cylinder injectors may degrade as the injector wears. Even cylinder wear can result in variations in the flow characteristics of the overall injector being fired, which is consistent with fuel variation. In the existing correction scheme, the fuel injection correction is carried out by an oxygen sensor signal of the engine. The correction principle is that the fuel injection quantity of all cylinders is adjusted in a closed loop mode according to the difference between the received signal of the front oxygen sensor and the control signal of the target air-fuel ratio of the engine. This compensation correction, which is an unexpected effect due to the uneven wear of the cylinders, is a technical drawback of the solutions currently available, as will be explained in detail with reference to the following examples.
| First cylinder | Second cylinder | Third jar | The fourth cylinder | Mean value of | |
| Deviation of engine fuel injection | 100.0％ | 100.0％ | 100.0％ | 110.0％ | 102.5％ |
| Average corrected effect | 97.6％ | 97.6％ | 97.6％ | 107.3％ | 100.0％ |
In the scheme, the pre-oxygen sensor is a comprehensive output result of all cylinders of the engine after combustion, correction is common average correction on all cylinders, but for differential abrasion of oil injectors of all cylinders of the engine, the correction measures have adverse effects, the difference of the oil injector of one cylinder can be superposed on the difference of the oil injectors of other cylinders for correction, and the correction effect cannot be obtained actually. As shown in the table, the fuel injection amount of the fourth cylinder of the four-cylinder engine is 10% larger.
As can be seen from the above table, when the fuel injection amounts of the four cylinders are combined and corrected, the corrected average fuel injection amount is restored to 100%, but the fuel injection amounts of the cylinders are deviated, the fuel injection amounts of the first cylinder, the second cylinder and the third cylinder, which are not deviated originally, are decreased, and the corrected fuel injection amounts of the four cylinders, which are 10% larger originally, are still 7% larger. The ideal injection level for each cylinder to return to 100% cannot be obtained.
Therefore, the above problems need to be solved by those skilled in the art.
Disclosure of Invention
In view of the above problems in the prior art, an object of the present invention is to provide a method and an apparatus for correcting an injection quantity of an engine, which can correct and compensate for attenuation of an injection quantity of an injector corresponding to an abnormal operating cylinder without replacing a whole set of injectors, thereby reducing maintenance cost and having a wide application range.
In order to solve the above problems, the present invention provides a method for correcting an injection quantity of an engine, comprising the steps of:
acquiring working condition information of an engine;
identifying that the engine enters a stable working condition according to the working condition information;
when the engine enters a stable working condition, calculating angular acceleration difference values corresponding to different working cylinders in the engine;
working time corresponding to different working cylinders in the engine is calculated according to the angular acceleration difference;
according to the working time, identifying an abnormal working cylinder;
and correcting and compensating the oil injection pulse width of the abnormal working cylinder.
Further, the operating condition information includes: temperature information of the engine, rotational speed value information of the engine, engine workload information, fuel usage information, and engine operation failure information.
Further, calculating the operating time of the engine according to the angular acceleration difference further includes:
calculating rotating speed values corresponding to different working cylinders in the engine according to the angular acceleration difference;
and calculating the working time corresponding to different working cylinders in the engine according to the rotating speed value.
Further, the formula for calculating the rotating speed values corresponding to different working cylinders in the engine is as follows: the angular acceleration difference = M is the square difference of the rotating speed value, and M is a positive number;
further, the formula for calculating the working time corresponding to different working cylinders in the engine is as follows: the rotation speed value = N the working time, N being a negative number.
Further, the angular acceleration difference is characterized as a difference between the angular acceleration of the working cylinder and the average angular acceleration.
Further, according to the operating time, identifying an abnormal operating cylinder includes:
accumulating the working time to obtain accumulated time lengths corresponding to different working cylinders;
screening out the maximum value in the accumulation duration;
and determining the working cylinder corresponding to the maximum value in the accumulated time length as an abnormal working cylinder.
Further, the operating time is characterized by the time required for the engine to rotate through one of the different cylinders.
Further, the correction method further includes: and after correcting and compensating the oil injection pulse width of the abnormal working cylinder, recalculating the angular acceleration difference of different working cylinders in the engine until the oil injection quantity of the different working cylinders is consistent.
The invention also protects a correction device for the oil injection quantity of the engine, which comprises the following components:
the working condition information acquisition module is used for acquiring the working condition information of the engine;
the control working condition module is used for identifying that the engine enters a stable working condition according to the working condition information;
the angular acceleration difference acquisition module is used for calculating angular acceleration differences corresponding to different working cylinders in the engine when the engine enters a stable working condition;
the working time acquisition module is used for calculating the working time corresponding to different working cylinders in the engine according to the angular acceleration difference;
the abnormal working cylinder determining module is used for identifying an abnormal working cylinder according to the working time;
and the correction compensation module is used for correcting and compensating the oil injection pulse width of the abnormal working cylinder.
Due to the technical scheme, the invention has the following beneficial effects:
the invention provides a method and a device for correcting the fuel injection quantity of an engine, which are suitable for most engines and have wide application range, and only need to correct and compensate the attenuation of the fuel injection quantity of a fuel injector corresponding to an abnormal working cylinder in the engine without replacing a whole set of fuel injectors, so that the fuel injection quantities of the fuel injectors corresponding to different working cylinders in the engine are consistent, and the maintenance cost is reduced.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the embodiment or the description of the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a flow chart of a method for modifying engine starting according to one embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a correction device for engine starting according to an embodiment of the present invention;
FIG. 3 is a flowchart of a method for correcting engine start according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a correction device for engine start according to a second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.
Example one
The embodiment provides a method for correcting an oil injection amount of an engine, as shown in fig. 1, which includes the following steps:
s101, obtaining working condition information of an engine;
specifically, the engine is a multi-cylinder engine, preferably, the engine is a 4-cylinder engine.
Furthermore, the fuel injection quantity attenuation of the fuel injector of the engine is linear attenuation, and the attenuated fuel injector can generate influence under different working conditions, so that different working cylinders in the engine are controlled to work under corresponding stable working conditions, and the interference on the fuel injection quantity attenuation caused by the instability of the combustion of the engine is avoided.
Specifically, the operating condition information includes: temperature information of the engine, rotational speed value information of the engine, engine workload information, fuel information, and engine operation failure information.
S102, identifying that the engine enters a stable working condition according to the working condition information;
specifically, the operating condition information corresponding to the stable operating condition includes: the temperature of the engine is 80 ℃, the rotating speed of the engine is 1600-2500r/min, the work load of the engine is 50-100 N.min, the fuel is methanol fuel, the residual fuel is 20-80% of the maximum volume of the fuel tank, and no engine operation fault exists.
S103, when the engine enters a stable working condition, calculating angular acceleration difference values corresponding to different working cylinders in the engine;
in particular, the angular acceleration difference is characterized as the difference between the angular acceleration of the working cylinder and the average angular acceleration.
Further, the average angular acceleration is an average angular acceleration of different working cylinders in the engine.
Further, the formula for calculating the rotating speed values corresponding to different working cylinders in the engine is as follows: the angular acceleration difference = M × the squared difference of the rotation speed values, M being a positive number;
specifically, the angular acceleration of the cylinder is: when different working cylinders in the engine are ignited according to a certain cycle, the corresponding angular acceleration of the working cylinders is increased; for example, a 4-cylinder engine, two of which are sequentially ignited in one group, wherein the angular acceleration corresponding to each group of working cylinders is the angular acceleration of the working cylinders.
S104, working time corresponding to different working cylinders in the engine is calculated according to the angular acceleration difference;
specifically, calculating the operating time of the engine according to the angular acceleration difference further includes:
calculating rotating speed values corresponding to different working cylinders in the engine according to the angular acceleration difference;
and calculating the working time corresponding to different working cylinders in the engine according to the rotating speed value.
Further, the formula for calculating the working time corresponding to different working cylinders in the engine is as follows: the rotation speed value = N the working time, N being a negative number.
Further, the square difference of the rotating speed values is the square difference of the rotating speed values corresponding to different cylinders in the engine and the average value of the rotating speed.
Further, the average rotating speed value is the average rotating speed value of different working cylinders in the engine
S105, identifying an abnormal working cylinder according to the working time;
specifically, the step S105 of identifying an abnormal cylinder according to the operating time includes:
accumulating the working time to obtain accumulated time lengths corresponding to different working cylinders;
screening out the maximum value in the accumulation duration;
and determining the working cylinder corresponding to the maximum value in the accumulated time length as an abnormal working cylinder.
In particular, the operating time is characterized by the time required for the engine to rotate through one of the different working cylinders.
And S106, correcting and compensating the oil injection pulse width of the abnormal working cylinder.
Specifically, the oil injection pulse width of the abnormal working cylinder is enlarged, so that the oil injection quantity can be accelerated, and the consistency of the oil injection quantity is realized.
The invention also provides a device for correcting the fuel injection quantity of the engine, which is applied to the method for correcting the fuel injection quantity of the engine, and as shown in fig. 2, the method comprises the following steps:
the working condition information acquisition module 10 is used for acquiring the working condition information of the engine;
the control working condition module 20 is used for identifying that the engine enters a stable working condition according to the working condition information;
the angular acceleration difference acquisition module 30 is configured to calculate angular acceleration differences corresponding to different working cylinders in the engine when the engine enters a stable working condition;
the working time obtaining module 40 is used for calculating the working time corresponding to different working cylinders in the engine according to the angular acceleration difference;
an abnormal working cylinder determining module 50, configured to identify an abnormal working cylinder according to the working time;
and the correction compensation module 60 is used for correcting and compensating the oil injection pulse width of the abnormal working cylinder.
Specifically, working condition information of the engine is obtained, wherein the working condition information comprises temperature information of the engine, rotating speed value information of the engine, working load information of the engine, fuel information and running fault information of the engine; according to the working condition information, identifying that the engine enters a stable working condition, wherein the conditions required to be met in the working condition information comprise that the temperature of the engine is 80 ℃, the rotating speed of the engine is 1600-2500r/min, the working load of the engine is 50-100 N.min, the fuel is methanol fuel, the residual fuel is 20-80% of the maximum volume of a fuel tank and no engine operation fault exists, and calculating the angular acceleration difference corresponding to different working cylinders in the engine, wherein the 4-cylinder engine is divided into two groups, each group is ignited alternately, the angular acceleration and the average angular acceleration corresponding to different working cylinders are obtained, the difference between the two is the angular acceleration difference, the corresponding rotating speed value, namely the rotating speed value of different working cylinders in the engine, is calculated according to the angular acceleration difference by a calculation formula, and the working time corresponding to different working cylinders in the engine is calculated according to the rotating speed value by the calculation formula; accumulating the working time, and determining that the accumulated time of one group of working cylinders is longer than that of the other group of working cylinders, namely, the working cylinders with the longer accumulated time are abnormal working cylinders, and the abnormal working cylinders cause insufficient oil injection quantity due to abrasion of an oil injection nozzle, so that correction compensation is performed on the oil injection pulse width of the abnormal working cylinders, and the oil injection quantity of the abnormal working cylinders is improved.
Further, the formula for calculating the rotating speed values corresponding to different working cylinders in the engine is as follows: the angular acceleration difference = M ×, M being a positive number, the squared difference of the rotation speed values.
Further, the formula for calculating the working time corresponding to different working cylinders in the engine is as follows: the rotation speed value = N the working time, N being a negative number.
The embodiment provides a method and a device for correcting the fuel injection quantity of an engine, which can correct and compensate the fuel injection quantity attenuation of a fuel injector corresponding to an abnormal working cylinder in the engine without replacing a whole set of fuel injectors, so that the fuel injection quantities of the fuel injectors corresponding to different working cylinders in the engine are consistent, the maintenance cost is reduced, and the method and the device are suitable for most engines and have a wide application range.
Example two
The second embodiment provides a method for correcting an engine fuel injection amount, as shown in fig. 3, including the following steps:
s101, obtaining working condition information of an engine;
furthermore, the fuel injection quantity attenuation of the fuel injector of the engine is linear attenuation, and the attenuated fuel injector can generate influence under different working conditions, so that different working cylinders in the engine are controlled to work under corresponding stable working conditions, and the interference on the fuel injection quantity attenuation caused by the instability of the combustion of the engine is avoided.
Specifically, the operating condition information includes: temperature information of the engine, rotational speed value information of the engine, engine workload information, fuel information, and engine operation failure information.
S102, identifying that the engine enters a stable working condition according to the working condition information;
specifically, the operating condition information corresponding to the stable operating condition includes: the temperature of the engine is 80 ℃, the rotating speed of the engine is 1600-2500r/min, the work load of the engine is 50-100 N.min, the fuel is methanol fuel, the residual fuel is 20-80% of the maximum volume of the fuel tank, and no engine operation fault exists.
S103, when the engine enters a stable working condition, calculating angular acceleration difference values corresponding to different working cylinders in the engine;
in particular, the angular acceleration difference is characterized as the difference between the angular acceleration of the working cylinder and the average angular acceleration.
Further, the average angular acceleration is an average angular acceleration of different working cylinders in the engine.
Further, the formula for calculating the rotating speed values corresponding to different working cylinders in the engine is as follows: the angular acceleration difference = M × the squared difference of the rotation speed values, M being a positive number;
specifically, the angular acceleration of the working cylinder is: when different working cylinders in the engine are ignited according to a certain cycle, the corresponding angular acceleration of the working cylinders is obtained; for example, a 4-cylinder engine, where two cylinders are sequentially ignited in a group, and the angular acceleration corresponding to each group of cylinders is the angular acceleration of the cylinders.
S104, working time corresponding to different working cylinders in the engine is calculated according to the angular acceleration difference;
specifically, calculating the operating time of the engine according to the angular acceleration difference further includes:
calculating rotating speed values corresponding to different working cylinders in the engine according to the angular acceleration difference;
and calculating the working time corresponding to different working cylinders in the engine according to the rotating speed value.
Further, the formula for calculating the working time corresponding to different working cylinders in the engine is as follows: the rotation speed value = N the working time, N being a negative number.
Further, the square difference of the rotating speed values is the square difference of the rotating speed values corresponding to different cylinders in the engine and the average value of the rotating speed.
Further, the average rotating speed value is the average rotating speed value of different working cylinders in the engine
S105, identifying an abnormal working cylinder according to the working time;
specifically, the step S105 of identifying an abnormal cylinder according to the operating time includes:
accumulating the working time to obtain accumulated time lengths corresponding to different working cylinders;
screening out the maximum value in the accumulation duration;
and determining the working cylinder corresponding to the maximum value in the accumulated time length as an abnormal working cylinder.
In particular, the operating time is characterized by the time required for the engine to rotate through one of the different working cylinders.
And S106, correcting and compensating the oil injection pulse width of the abnormal working cylinder.
Specifically, the oil injection pulse width of the abnormal working cylinder is enlarged, so that the oil injection quantity can be accelerated, and the consistency of the oil injection quantity is realized.
And S107, after correcting and compensating the oil injection pulse width of the abnormal working cylinder, recalculating the angular acceleration difference of different working cylinders of the engine until the oil injection quantity of the different working cylinders is consistent.
Specifically, in step S107, before the angular acceleration difference of different cylinders in the engine is recalculated, the angular acceleration difference of different cylinders in the engine that is calculated before needs to be cleared, so as to ensure the accuracy of recalculation.
The invention also provides a device for correcting the fuel injection quantity of the engine, which is applied to the method for correcting the fuel injection quantity of the engine, and as shown in fig. 4, the method comprises the following steps:
the working condition information acquisition module 10 is used for acquiring the working condition information of the engine;
the control working condition module 20 is used for identifying that the engine enters a stable working condition according to the working condition information;
the angular acceleration difference acquisition module 30 is configured to calculate angular acceleration differences corresponding to different working cylinders in the engine when the engine enters a stable working condition;
the working time obtaining module 40 is used for calculating the working time corresponding to different working cylinders in the engine according to the angular acceleration difference;
an abnormal working cylinder determining module 50, configured to identify an abnormal working cylinder according to the working time;
the correction compensation module 60 is used for correcting and compensating the oil injection pulse width of the abnormal working cylinder;
a recalculating module 70, configured to recalculate the angular acceleration difference of different working cylinders in the engine after the correction and compensation are performed on the fuel injection pulse width of the abnormal working cylinder until the fuel injection amount of the different working cylinders is consistent
Specifically, the method comprises the steps of obtaining working condition information of an engine, wherein the working condition information comprises temperature information of the engine, rotating speed value information of the engine, work load information of the engine, fuel information and running fault information of the engine; according to the working condition information, identifying that the engine enters a stable working condition, wherein the conditions required to be met in the working condition information comprise that the temperature of the engine is 80 ℃, the rotating speed of the engine is 1600-2500r/min, the working load of the engine is 50-100 N.min, the fuel is methanol fuel, the residual fuel is 20-80% of the maximum volume of a fuel tank and no engine operation fault exists, and calculating the angular acceleration difference corresponding to different working cylinders in the engine, wherein the 4-cylinder engine is divided into two groups, each group is ignited alternately, the angular acceleration and the average angular acceleration corresponding to different working cylinders are obtained, the difference between the two is the angular acceleration difference, the corresponding rotating speed value, namely the rotating speed value of different working cylinders in the engine, is calculated according to the angular acceleration difference by a calculation formula, and the working time corresponding to different working cylinders in the engine is calculated according to the rotating speed value by the calculation formula; accumulating the working time, and determining that the accumulated time of one group of working cylinders is longer than that of the other group of working cylinders, namely, the working cylinders with the longer accumulated time are abnormal working cylinders, and the abnormal working cylinders cause insufficient oil injection quantity due to abrasion of an oil injection nozzle, so that correction compensation is performed on the oil injection pulse width of the abnormal working cylinders, and the oil injection quantity of the abnormal working cylinders is improved. And when the correction compensation is carried out once, the oil injection quantity of the abnormal working cylinder cannot be adjusted to a normal level, multiple times of adjustment are needed, the angular acceleration difference value of different working cylinders in the engine needs to be recalculated before each adjustment, the steps are carried out again, the abnormal working cylinder is determined again, the correction compensation is carried out on the abnormal working cylinder again, the oil injection quantity is adjusted, and the like is carried out, and the steps are repeatedly circulated until the oil injection quantities of the different working cylinders are consistent.
Further, the formula for calculating the rotating speed values corresponding to different working cylinders in the engine is as follows: the angular acceleration difference = M ×, M being a positive number, the squared difference of the rotation speed values.
Further, the formula for calculating the working time corresponding to different working cylinders in the engine is as follows: the rotation speed value = N the working time, N being a negative number.
The second embodiment provides a method and a device for correcting the fuel injection quantity of the engine, which can repeatedly calculate an angular acceleration difference value, and repeatedly correct and compensate the fuel injection quantity attenuation of a fuel injector until the fuel injection quantities of the fuel injectors corresponding to different working cylinders in the engine are consistent, so that the maintenance cost is reduced, and the method and the device are suitable for most engines and are wide in application range.
It is noted that for the sake of simplicity, each of the above-described method embodiments is described as a series of acts, but it should be understood by those skilled in the art that the present invention is not limited by the order of acts described, as some steps may be performed in other orders or simultaneously according to the present invention. Similarly, the modules of the device for correcting the fuel injection amount of the engine refer to computer programs or program segments for executing one or more specific functions, and the distinction among the modules does not mean that actual program codes are necessarily separated. Further, the above embodiments may be arbitrarily combined to obtain other embodiments.
In the foregoing embodiments, the descriptions of the embodiments have respective emphasis, and reference may be made to related descriptions of other embodiments for parts that are not described in detail in a certain embodiment. Those of skill in the art will also appreciate that the various illustrative logical blocks, elements, and steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate the interchangeability of hardware and software, various illustrative components, elements, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design requirements of the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present embodiments.
The foregoing description has disclosed fully preferred embodiments of the present invention. It should be noted that those skilled in the art can make modifications to the embodiments of the present invention without departing from the scope of the appended claims. Accordingly, the scope of the appended claims should not be limited to the description of the embodiments contained herein.
Claims (8)
1. The method for correcting the fuel injection quantity of the engine is characterized by comprising the following steps of:
acquiring working condition information of an engine;
identifying that the engine enters a stable working condition according to the working condition information;
when the engine enters a stable working condition, calculating angular acceleration difference values corresponding to different working cylinders in the engine;
working time corresponding to different working cylinders in the engine is calculated according to the angular acceleration difference;
identifying an abnormal working cylinder according to the working time;
correcting and compensating the oil injection pulse width of the abnormal working cylinder;
according to the angular acceleration difference, the working time of the engine is calculated, and the working time further comprises the following steps:
calculating rotating speed values corresponding to different working cylinders in the engine according to the angular acceleration difference;
and calculating the working time corresponding to different working cylinders in the engine according to the rotating speed value.
2. The method of claim 1, wherein the operating condition information comprises: temperature information of the engine, rotational speed value information of the engine, engine workload information, fuel usage information, and engine operation failure information.
3. The method of correcting an amount of fuel injected into an engine according to claim 1,
the formula for calculating the rotating speed values corresponding to different working cylinders in the engine is as follows: the angular acceleration difference = M ×, M being a positive number, the squared difference of the rotation speed values.
4. The method of claim 1, wherein the angular acceleration difference is characterized by a difference between an angular acceleration of the working cylinder and an average angular acceleration.
5. The method of claim 1, wherein identifying abnormal operating cylinders based on said operating time comprises:
accumulating the working time to obtain accumulated time lengths corresponding to different working cylinders;
screening out the maximum value in the accumulation duration;
and determining the working cylinder corresponding to the maximum value in the accumulated time length as an abnormal working cylinder.
6. The method of claim 5, wherein the operating time is characterized by the time required for the engine to rotate through one of the different cylinders.
7. The method for correcting the injection quantity of the engine according to claim 1, further comprising: and after correcting and compensating the oil injection pulse width of the abnormal working cylinder, recalculating the angular acceleration difference of different working cylinders in the engine until the oil injection quantity of the different working cylinders is consistent.
8. An engine fuel injection quantity correction device, characterized by comprising:
the working condition information acquisition module (10) is used for acquiring the working condition information of the engine;
the control working condition module (20) is used for identifying that the engine enters a stable working condition according to the working condition information;
the angular acceleration difference acquisition module (30) is used for calculating the angular acceleration difference corresponding to different working cylinders in the engine when the engine enters a stable working condition;
the working time acquisition module (40) is used for calculating the working time corresponding to different working cylinders in the engine according to the angular acceleration difference;
an abnormal working cylinder determining module (50) for identifying an abnormal working cylinder according to the working time;
the correction compensation module (60) is used for correcting and compensating the oil injection pulse width of the abnormal working cylinder;
calculating the working time of the engine according to the angular acceleration difference further comprises:
calculating rotating speed values corresponding to different working cylinders in the engine according to the angular acceleration difference;
and calculating the working time corresponding to different working cylinders in the engine according to the rotating speed value.
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| CN202010835177.9A CN112049733B (en) | 2020-08-19 | 2020-08-19 | Correction method and device for fuel injection quantity of engine |
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| CN202010835177.9A CN112049733B (en) | 2020-08-19 | 2020-08-19 | Correction method and device for fuel injection quantity of engine |
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| CN112049733A CN112049733A (en) | 2020-12-08 |
| CN112049733B true CN112049733B (en) | 2022-11-25 |
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| CN202010835177.9A Active CN112049733B (en) | 2020-08-19 | 2020-08-19 | Correction method and device for fuel injection quantity of engine |
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| JPH0617696A (en) * | 1990-12-10 | 1994-01-25 | Yamaha Motor Co Ltd | Control method of engine fuel injection |
| US5442955A (en) * | 1993-04-21 | 1995-08-22 | Toyota Jidosha Kabushiki Kaisha | Misfire detecting device of multicylinder internal combustion engine |
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| JP2004108160A (en) * | 2002-09-13 | 2004-04-08 | Denso Corp | Fuel injection device for internal combustion engine |
| JP2009299481A (en) * | 2008-06-10 | 2009-12-24 | Nissan Motor Co Ltd | Misfire diagnostic device for engine |
| CN110173365A (en) * | 2019-06-29 | 2019-08-27 | 潍柴动力股份有限公司 | A kind of method and system of each cylinder distributive value of balanced engine |
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| US5086741A (en) * | 1989-08-25 | 1992-02-11 | Hitachi, Ltd. | Method and apparatus for detecting and controlling combustion condition in an internal combustion engine |
| JPH0617696A (en) * | 1990-12-10 | 1994-01-25 | Yamaha Motor Co Ltd | Control method of engine fuel injection |
| US5452604A (en) * | 1993-02-05 | 1995-09-26 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Misfire detection method based on fluctuation in crankshaft rotation |
| US5442955A (en) * | 1993-04-21 | 1995-08-22 | Toyota Jidosha Kabushiki Kaisha | Misfire detecting device of multicylinder internal combustion engine |
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| JP2004108160A (en) * | 2002-09-13 | 2004-04-08 | Denso Corp | Fuel injection device for internal combustion engine |
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