CN117514460A - Method, device, medium and ECU for detecting knocking of engine in precombustion chamber - Google Patents
Method, device, medium and ECU for detecting knocking of engine in precombustion chamber Download PDFInfo
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- CN117514460A CN117514460A CN202311425319.4A CN202311425319A CN117514460A CN 117514460 A CN117514460 A CN 117514460A CN 202311425319 A CN202311425319 A CN 202311425319A CN 117514460 A CN117514460 A CN 117514460A
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- 238000002485 combustion reaction Methods 0.000 claims abstract description 71
- 238000001514 detection method Methods 0.000 claims abstract description 22
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- 238000004364 calculation method Methods 0.000 description 10
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/085—Safety, indicating, or supervising devices with sensors measuring combustion processes, e.g. knocking, pressure, ionization, combustion flame
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Abstract
The invention relates to the technical field of engines, in particular to a knocking detection method and device for a precombustor engine, a medium and an ECU (electronic control Unit), which can accurately identify the knocking phenomenon of the precombustor engine. Firstly, acquiring cylinder pressure information of an ignition period of a precombustion chamber and cylinder pressure information of an ignition period of a main combustion chamber; and then judging whether knocking occurs or not by comparing the cylinder pressure information of the ignition period of the precombustion chamber with the cylinder pressure information of the ignition period of the main combustion chamber. Aiming at the engine with the pre-combustion chamber ignition technology, the invention can distinguish the cylinder pressure change caused by the ignition of the pre-combustion chamber from the cylinder pressure change caused by the ignition of the main combustion chamber, and can accurately judge whether the knocking phenomenon occurs or not by calculating the ratio of the ignition cylinder pressure change of the pre-combustion chamber to the ignition cylinder pressure of the main combustion chamber, thereby solving the technical problem that the knocking of the engine with the pre-combustion chamber ignition technology cannot be accurately identified by the traditional knocking method.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a method and a device for detecting knocking of a precombustion chamber engine, a medium and an ECU.
Background
The technical roadmap of the national energy conservation and new energy automobile in 10 months in 2020 is published in 2.0, the energy conservation automobile comprising a hybrid automobile and a fuel automobile in 2035 still accounts for 50%, fuel consumption indexes are clear for both the hybrid automobile and the fuel automobile, the hybrid automobile in 2025 is 5.3L/100KM, the fuel is 6.3L/100KM, the hybrid automobile in 2030 is 4.5L/100KM, the fuel is 5.7L/100KM, and the hybrid automobile in 2035 is 4.0L/100KM. Therefore, the application of the new technology to improve the heat efficiency of the engine and reduce the fuel consumption becomes one of the most urgent development directions of the traditional power system. The engine precombustor technology in the new technology can shorten the flame-retarding period, improve the combustion speed, reduce the knocking tendency, improve the compression ratio and reduce the fuel consumption, and the advantages make the precombustor technology one of the current engine development hot spots, and the double-spark plug precombustor structure is shown in fig. 3.
In the ignition state of the precombustor, due to the short flame-retarding period and severe combustion, a pressure oscillation signal similar to knocking is likely to appear in a normal combustion cycle without knocking, as shown in fig. 1, if a traditional knock intensity calculation method is used to perform high-pass filtering on a cylinder pressure signal and then take the maximum value, the calculated knock intensity kp_pk is larger, and is mistakenly considered to knocking. As shown in fig. 6 and 7, the conventional knock intensity kp_pk1=2.87 when knocking occurs in fig. 6, and the conventional knock intensity kp_pk2=2.79 when knocking does not occur in fig. 7 are equivalent in intensity, so that the present knock intensity calculation method cannot be used to distinguish whether knocking occurs.
Therefore, it is clearly not appropriate to determine whether knocking has occurred in the pre-chamber ignition technique by the conventional knock intensity calculation method.
Disclosure of Invention
The invention discloses a knocking detection method, a knocking detection device, a knocking detection medium and an ECU (electronic control unit) for a pre-combustion chamber engine, which can accurately identify the knocking phenomenon of the pre-combustion chamber ignition engine.
In order to achieve the above object, in one aspect, a method for detecting knock of a prechamber engine is provided, which comprises the following steps:
acquiring cylinder pressure information of an ignition period of the precombustion chamber and cylinder pressure information of an ignition period of the main combustion chamber;
by comparing the cylinder pressure information of the pre-combustion chamber ignition period with the cylinder pressure information of the main combustion chamber ignition period, it is judged whether knocking occurs.
The embodiment has the advantages that for the engine adopting the pre-combustion chamber ignition technology, the cylinder pressure change caused by the ignition of the pre-combustion chamber and the cylinder pressure change caused by the ignition of the main combustion chamber can be distinguished, the general knocking phenomenon is all generated in the main combustion chamber, and whether the knocking phenomenon occurs or not can be accurately judged by comparing the cylinder pressure change caused by the ignition of the pre-combustion chamber and the cylinder pressure change caused by the ignition of the main combustion chamber, so that the technical problem that the engine adopting the pre-combustion chamber ignition technology cannot be accurately identified by the traditional knocking method is solved.
Preferably, the cylinder pressure information is acquired by a knock sensor.
Alternatively, the cylinder pressure information is directly obtained through information interaction.
Further, the pre-chamber ignition period cylinder pressure variation and the main combustion chamber ignition period cylinder pressure variation are determined by the first knock recognition window and the second knock recognition window, respectively.
The embodiment has the advantages that the cylinder pressure signal caused by the ignition of the precombustion chamber and the cylinder pressure signal caused by the ignition of the main combustion chamber are marked through the identification window, so that signal identification, calculation and judgment are facilitated, and the judgment accuracy is remarkably improved.
Preferably, the first knock recognition window and the second knock recognition window are defined as follows:
analyzing the cylinder pressure signal, determining that a first preset interval forward from the maximum amplitude is defined as a first knock recognition window at the maximum amplitude position of the cylinder pressure signal, and a second preset interval backward from the maximum amplitude is defined as a second knock recognition window.
The embodiment has the advantages that experiments and statistics show that the maximum cylinder pressure amplitude can be used as a boundary between the ignition of the precombustion chamber and the ignition of the main combustion chamber, and the first knocking identification window and the second knocking identification window can be accurately separated through the boundary, so that the accuracy is high and the implementation is easy.
Optionally, the first knock recognition window and the second knock recognition window are defined, and the specific method is as follows:
analyzing the cylinder pressure signal, determining the maximum amplitude position of the cylinder pressure signal, forming an isolation section based on the maximum amplitude position, wherein a first preset section of the isolation section forwards is defined as a first knock recognition window, and a second preset section of the isolation section backwards is defined as a second knock recognition window.
The advantage of this embodiment is that for some prechamber engines, the prechamber ignition and the main chamber ignition may overlap, the maximum amplitude position is disturbed by both ignitions, and the situation of knock determination is easy to occur, so that the probability of knock misdetermination can be reduced by setting the first knock recognition window and the second knock recognition window on both sides of the maximum amplitude respectively.
Optionally, judging whether knocking occurs or not, the specific method is as follows:
respectively carrying out high-pass filtering processing on cylinder pressure information acquired by the first knocking identification window and the second knocking identification window to respectively acquire a precombustion cylinder pressure signal and a main combustion cylinder pressure signal;
integrating the magnitudes of the precombustion cylinder pressure signal and the main combustion cylinder pressure signal to respectively calculate a precombustion air pressure value and a main combustion gas pressure value, and judging that the engine knocks if the precombustion air pressure value subtracted by the main combustion gas pressure value is larger than a preset threshold value; otherwise, it is determined that the engine has not knocked.
Preferably, whether knocking occurs is judged by the following specific method:
respectively carrying out high-pass filtering processing on cylinder pressure information acquired by the first knocking identification window and the second knocking identification window to respectively acquire a precombustion cylinder pressure signal and a main combustion cylinder pressure signal;
respectively acquiring the maximum amplitude values of the precombustion cylinder pressure signal and the main combustion cylinder pressure signal, respectively recording as a precombustion air pressure extreme value and a main combustion air pressure extreme value, dividing the main combustion air pressure extreme value by the precombustion air pressure extreme value to obtain a knock judgment parameter, and judging that the engine knocks if the knock judgment parameter is larger than a preset threshold value; otherwise, it is determined that the engine has not knocked.
The embodiment has the advantages that the ratio algorithm is adopted as the knock judgment parameter, the universality is strong, the calculation is simple, the implementation is easy, and the knock detection can be realized for engines of different types.
In order to achieve the above object, another aspect provides a knock detection device for a prechamber engine, including a cylinder pressure information acquisition module and a knock determination module;
the cylinder pressure information acquisition module acquires cylinder pressure information of a pre-combustion chamber ignition period and cylinder pressure information of a main combustion chamber ignition period;
the knocking judging module judges whether knocking occurs or not by comparing cylinder pressure information of the ignition period of the precombustion chamber with cylinder pressure information of the ignition period of the main combustion chamber.
In order to achieve the above object, another aspect provides a storage medium storing a plurality of instructions, and a processor loads the plurality of instructions to execute the method for detecting knocking of the pre-combustion engine.
To achieve the above object, in another aspect, there is provided an ECU including the above-described prechamber engine knock detection device, and/or the above-described storage medium.
It should be noted that, the terms "first", "second", and the like are used herein merely to describe each component in the technical solution, and do not constitute a limitation on the technical solution, and are not to be construed as indicating or implying importance of the corresponding component; elements with "first", "second" and the like mean that in the corresponding technical solution, the element includes at least one.
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In order to more clearly illustrate the technical solution of the present invention, the technical effects, technical features and objects of the present invention will be further understood, and the present invention will be described in detail below with reference to the accompanying drawings, which form a necessary part of the specification, and together with the embodiments of the present invention serve to illustrate the technical solution of the present invention, but not to limit the present invention.
Like reference numerals in the drawings denote like parts, in particular:
FIG. 1 is a schematic diagram of a conventional knock intensity calculation of cylinder pressure signals under prechamber technology.
FIG. 2 is a schematic diagram of knock signals for a pre-chamber ignition technique and a conventional ignition technique.
FIG. 3 is a schematic diagram of a dual spark plug prechamber configuration in the background.
Fig. 4 is a schematic diagram of a knock recognition window in embodiment 2.
Fig. 5 is a display diagram of the pilot cylinder pressure signal and the main cylinder pressure signal selected in examples 1 and 2.
Fig. 6 is a cylinder pressure signal when knocking occurs in the background art and a result of conventional knock intensity calculation.
Fig. 7 shows cylinder pressure signals when knocking does not occur in the related art and a result of conventional knock intensity calculation.
Fig. 8 is a schematic diagram of new knock intensity calculation in embodiment 2.
Fig. 9 is a flow chart of the steps of example 2.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. Of course, the following specific examples are set forth only to illustrate the technical solution of the present invention, and are not intended to limit the present invention. Furthermore, the parts expressed in the examples or drawings are merely illustrative of the relevant parts of the present invention, and not all of the present invention.
The traditional knock intensity calculating method carries out high-pass filtering on the cylinder pressure signal and then takes the maximum value, and the knock intensity is calculated through the maximum value. However, the pre-chamber ignition technique changes the behavior of the combustion pressure wave compared to conventional combustion chambers. The specific expression related to knocking is:
1. the timing of knocking occurrence for the same condition is changed, as in the blue box of fig. 2, the knock signal prechamber is advanced over the non-prechamber. 2. The combustion pressure will continuously fluctuate at maximum before knocking occurs, as in the red circle box of fig. 2, the prechamber has significant cylinder pressure fluctuations before knocking occurs. The following embodiments are specifically presented for calculating engine knock intensity for pressure waveform characteristic changes after pre-chamber ignition techniques.
Example 1:
a knocking detection method for a precombustor engine comprises the following specific steps:
s1, acquiring cylinder pressure information of a pre-combustion chamber ignition period and cylinder pressure information of a main combustion chamber ignition period.
Specifically, cylinder pressure information is directly obtained through information interaction.
After the cylinder pressure information is acquired, the cylinder pressure change in the ignition period of the precombustion chamber and the ignition period change of the main combustion chamber are respectively determined through the first knocking identification window and the second knocking identification window.
Specifically, a first knock recognition window and a second knock recognition window are defined, and the specific method is as follows:
analyzing the cylinder pressure signal, determining the maximum amplitude position of the maximum cylinder pressure signal, forming an isolation section by taking the maximum amplitude position as a basis, and defining a first preset section of the isolation section forward as a first knock recognition window and defining a second preset section of the isolation section backward as a second knock recognition window.
S2, judging whether knocking occurs or not by comparing the cylinder pressure information of the ignition period of the precombustion chamber with the cylinder pressure information of the ignition period of the main combustion chamber.
Specifically, whether knocking occurs is judged by the following specific method:
respectively carrying out high-pass filtering processing on cylinder pressure information acquired by the first knocking identification window and the second knocking identification window to respectively acquire a precombustion cylinder pressure signal and a main combustion cylinder pressure signal;
integrating the magnitudes of the precombustion cylinder pressure signal and the main combustion cylinder pressure signal to respectively calculate a precombustion air pressure value and a main combustion gas pressure value, and judging that the engine knocks if the precombustion air pressure value subtracted by the main combustion gas pressure value is larger than a preset threshold value; otherwise, it is determined that the engine has not knocked.
Example 2:
as shown in fig. 9, the method for detecting knocking of the engine in the pre-combustion chamber comprises the following specific steps:
s1, acquiring cylinder pressure information of a pre-combustion chamber ignition period and cylinder pressure information of a main combustion chamber ignition period.
Specifically, cylinder pressure information is acquired by a knock sensor.
After the cylinder pressure information is acquired, the cylinder pressure change in the ignition period of the precombustion chamber and the ignition period change of the main combustion chamber are respectively determined through the first knocking identification window and the second knocking identification window.
Specifically, a first knock recognition window and a second knock recognition window are defined, and the specific method is as follows:
analyzing the cylinder pressure signal, determining that a first preset interval forward from the maximum amplitude is defined as a first knock recognition window at the maximum amplitude position of the maximum cylinder pressure signal, and a second knock recognition window rearward from the maximum amplitude is defined as a second knock recognition window.
In step S1 of this embodiment, the first knock-out window X1 and the second knock-out window X2 are selected to be 0 ° to 20 ° CA after compression top dead center and 20 ° to 40 ° CA after compression top dead center, respectively, as shown in fig. 4.
S2, judging whether knocking occurs or not by comparing the cylinder pressure information of the ignition period of the precombustion chamber with the cylinder pressure information of the ignition period of the main combustion chamber.
Specifically, whether knocking occurs is judged by the following specific method:
respectively carrying out high-pass filtering processing on cylinder pressure information acquired by the first knocking identification window and the second knocking identification window to respectively acquire a precombustion cylinder pressure signal and a main combustion cylinder pressure signal;
respectively acquiring the maximum amplitude values of the precombustion cylinder pressure signal and the main combustion cylinder pressure signal, respectively recording as a precombustion air pressure extreme value and a main combustion air pressure extreme value, dividing the main combustion air pressure extreme value by the precombustion air pressure extreme value to obtain a knock judgment parameter, and judging that the engine knocks if the knock judgment parameter is larger than a preset threshold value; otherwise, it is determined that the engine has not knocked.
In this embodiment, as shown in fig. 8, the new knock intensity calculation method first finds the position corresponding to the maximum cylinder pressure, calculates a filtered maximum value kp_pk_after in a certain length window 1 after the position, calculates a filtered maximum value kp_pk_before in a certain length window 2 before the position, and divides the two values to obtain the new knock intensity kp_pk_idx, that is, kp_pk_idx=kp_pk_after. For the signal in fig. 6, knock intensity kp_pk_idx1=1.86 calculated by the new method, and for the signal in fig. 7, knock intensity kp_pk_idx2=0.21 calculated by the new method, it can be seen that it is more reasonable to evaluate knock intensity using the index.
In step S2 of example 2, the ratio of the second peak Y2 to the first peak Y1 of the signal fluctuation is selected, and in step S2 of example 1, the difference between the integrated signal Z2 of the second peak region and the integrated signal Z1 of the first peak region is selected, as shown in fig. 5.
The cylinder pressure information acquiring manners in step S1 of embodiment 1 and embodiment 2 may be data exchange, sensor acquisition, or other existing means capable of accurately and directly or indirectly acquiring cylinder pressure information.
As can be seen from the method of defining knock detection windows in step S1 of examples 1 and 2, the first knock detection window and the second knock detection window can be arbitrarily divided by the signal analysis means for different engine ignition time slots, in which the principle is to exclude interference signals as much as possible and to retain the complete post-ignition cylinder pressure signal as much as possible.
As can be seen from step S2 of examples 1 and 2, the pre-combustion cylinder pressure signal and the main combustion cylinder pressure signal can be compared by the difference, and the pre-combustion cylinder pressure signal and the main combustion cylinder pressure signal can be compared by the ratio, however, other comparison modes similar to the mixing operation can be reasonably deduced, and the engine knock can be determined when the increase amplitude of the main combustion cylinder pressure signal is too high.
As can be seen from step S2 of examples 1 and 2, the maximum extremum of the precombustion cylinder pressure signal and the main cylinder pressure signal can be used as a comparison basis, the total amplitude of the precombustion cylinder pressure signal and the main cylinder pressure signal can be used as a comparison basis, and mathematical characteristics similar to the average amplitude can be reasonably deduced as a comparison basis.
It should be noted that the foregoing examples are merely for clearly illustrating the technical solution of the present invention, and those skilled in the art will understand that the embodiments of the present invention are not limited to the foregoing, and that obvious changes, substitutions or alterations can be made based on the foregoing without departing from the scope covered by the technical solution of the present invention; other embodiments will fall within the scope of the invention without departing from the inventive concept.
Claims (11)
1. A knocking detection method for a precombustion chamber engine is characterized by comprising the following steps of:
acquiring cylinder pressure information of an ignition period of the precombustion chamber and cylinder pressure information of an ignition period of the main combustion chamber;
by comparing the cylinder pressure information of the pre-combustion chamber ignition period with the cylinder pressure information of the main combustion chamber ignition period, it is judged whether knocking occurs.
2. The method for detecting knocking of a prechamber engine according to claim 1, characterized in that the cylinder pressure information is obtained by a knock sensor.
3. The method for detecting knocking of a prechamber engine according to claim 1, characterized in that the cylinder pressure information is directly obtained by information interaction.
4. The method of pre-chamber engine knock detection according to claim 1, wherein the pre-chamber ignition period cylinder pressure variation and the main-chamber ignition period cylinder pressure variation are determined by a first knock recognition window and a second knock recognition window, respectively.
5. The method of pre-chamber engine knock detection according to claim 4, wherein the first knock detection window and the second knock detection window are defined as follows:
analyzing the cylinder pressure signal, determining that a first preset interval forward from the maximum amplitude is defined as a first knock recognition window at the maximum amplitude position of the cylinder pressure signal, and a second preset interval backward from the maximum amplitude is defined as a second knock recognition window.
6. The method of pre-chamber engine knock detection according to claim 4, wherein the first knock detection window and the second knock detection window are defined as follows:
analyzing the cylinder pressure signal, determining the maximum amplitude position of the cylinder pressure signal, forming an isolation section based on the maximum amplitude position, wherein a first preset section of the isolation section forwards is defined as a first knock recognition window, and a second preset section of the isolation section backwards is defined as a second knock recognition window.
7. The method for detecting knocking of a prechamber engine as in claim 4, wherein determining whether knocking has occurred is performed by:
respectively carrying out high-pass filtering processing on cylinder pressure information acquired by the first knocking identification window and the second knocking identification window to respectively acquire a precombustion cylinder pressure signal and a main combustion cylinder pressure signal;
integrating the magnitudes of the precombustion cylinder pressure signal and the main combustion cylinder pressure signal to respectively calculate a precombustion air pressure value and a main combustion gas pressure value, and judging that the engine knocks if the precombustion air pressure value subtracted by the main combustion gas pressure value is larger than a preset threshold value; otherwise, it is determined that the engine has not knocked.
8. The method for detecting knocking of a prechamber engine as in claim 4, wherein determining whether knocking has occurred is performed by:
respectively carrying out high-pass filtering processing on cylinder pressure information acquired by the first knocking identification window and the second knocking identification window to respectively acquire a precombustion cylinder pressure signal and a main combustion cylinder pressure signal;
respectively acquiring the maximum amplitude values of the precombustion cylinder pressure signal and the main combustion cylinder pressure signal, respectively recording as a precombustion air pressure extreme value and a main combustion air pressure extreme value, dividing the main combustion air pressure extreme value by the precombustion air pressure extreme value to obtain a knock judgment parameter, and judging that the engine knocks if the knock judgment parameter is larger than a preset threshold value; otherwise, it is determined that the engine has not knocked.
9. The knocking detection device for the engine in the precombustion chamber is characterized by comprising a cylinder pressure information acquisition module and a knocking judgment module;
the cylinder pressure information acquisition module acquires cylinder pressure information of a pre-combustion chamber ignition period and cylinder pressure information of a main combustion chamber ignition period;
the knocking judging module judges whether knocking occurs or not by comparing cylinder pressure information of the ignition period of the precombustion chamber with cylinder pressure information of the ignition period of the main combustion chamber.
10. A storage medium having stored thereon instructions which are loaded by a processor to perform the method of pre-chamber engine knock detection according to any one of claims 1 to 8.
11. An ECU comprising the prechamber engine knock detection device according to claim 9 and/or the storage medium according to claim 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311425319.4A CN117514460A (en) | 2023-10-31 | 2023-10-31 | Method, device, medium and ECU for detecting knocking of engine in precombustion chamber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311425319.4A CN117514460A (en) | 2023-10-31 | 2023-10-31 | Method, device, medium and ECU for detecting knocking of engine in precombustion chamber |
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| CN202311425319.4A Pending CN117514460A (en) | 2023-10-31 | 2023-10-31 | Method, device, medium and ECU for detecting knocking of engine in precombustion chamber |
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