CN116696582B - Calibration method and calibration device for engine oil injection parameters - Google Patents
Calibration method and calibration device for engine oil injection parameters Download PDFInfo
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- CN116696582B CN116696582B CN202310986929.5A CN202310986929A CN116696582B CN 116696582 B CN116696582 B CN 116696582B CN 202310986929 A CN202310986929 A CN 202310986929A CN 116696582 B CN116696582 B CN 116696582B
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- release rate
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- 238000002347 injection Methods 0.000 title claims abstract description 246
- 239000007924 injection Substances 0.000 title claims abstract description 246
- 238000000034 method Methods 0.000 title claims abstract description 61
- 239000010705 motor oil Substances 0.000 title description 3
- 238000002485 combustion reaction Methods 0.000 claims abstract description 194
- 239000000446 fuel Substances 0.000 claims abstract description 34
- 238000000781 heat-release-rate curve Methods 0.000 claims description 21
- 239000003921 oil Substances 0.000 description 16
- 230000009977 dual effect Effects 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002902 bimodal effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
-
- 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
- F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
-
- 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
-
- 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 belongs to the technical field of engines, and particularly relates to a method and a device for calibrating fuel injection parameters of an engine, wherein the engine adopts a double-main-injection strategy comprising a first main injection and a second main injection, and the method comprises the following steps: controlling the engine to operate according to an initial double-main-injection strategy; collecting combustion heat release rate data and crank angle data in the running process of an engine; and calibrating injection parameters of the first main injection and the second main injection according to the combustion heat release rate data and the crank angle data. Calibrating injection parameters of the first main injection and the second main injection according to the combustion heat release rate data and the crank angle data, wherein the method comprises the following steps: and determining a first crank angle when the combustion heat release rate is at a first set value according to the combustion heat release rate data and the crank angle data, and adjusting the pressure of the first main injection and the starting time of the second main injection according to the first crank angle. The engine is operated by adopting the calibration parameters, so that the combustion efficiency of the engine is ensured and the oil consumption is reduced while the operation noise of the engine is reduced.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to a calibration method and a calibration device for fuel injection parameters of an engine.
Background
This section provides merely background information related to the present disclosure and is not necessarily prior art.
During operation, the cylinder undergoes severe pressure change, and the combustion chamber wall is impacted to make the engine structure vibrate and transferred to the engine surface, and finally, the engine radiates to the air to generate larger combustion noise. The traditional engine adopts a single main injection strategy, and all fuel meeting the output requirement is injected once, when in-cylinder fuel starts to burn, the premixing of the in-cylinder fuel can raise the combustion rate, the combustion start point is positioned in front, the in-cylinder pressure raising rate is higher, and thus the generated vibration and combustion noise are also larger. In the related art, the rising rate of the pressure in an engine cylinder can be remarkably reduced by adopting a double main injection strategy, so that the aim of reducing the noise of the engine is fulfilled. However, the dual main injection strategy reduces combustion noise but reduces combustion efficiency of the engine and increases fuel consumption.
Disclosure of Invention
The invention aims to at least solve the problems of low combustion efficiency and large oil consumption of an engine adopting a double main injection strategy. The aim is achieved by the following technical scheme:
the first aspect of the present invention provides a method for calibrating fuel injection parameters of an engine, the engine adopts a dual main injection strategy including a first main injection and a second main injection, the method comprises:
controlling the engine to operate according to an initial double-main-injection strategy;
collecting combustion heat release rate data and crank angle data in the running process of an engine;
calibrating injection parameters of the first main injection and the second main injection according to the combustion heat release rate data and the crank angle data;
the calibrating injection parameters of the first main injection and the second main injection according to the combustion heat release rate data and the crank angle data comprises the following steps:
and determining a first crank angle of the combustion heat release rate at a first set value according to the combustion heat release rate data and the crank angle data, and adjusting the pressure of the first main injection and the starting time of the second main injection according to the first crank angle.
According to the calibration method of the engine oil injection parameters, the injection parameters of the first main injection and the second main injection are regulated and controlled according to the combustion heat release rate data and the crank angle data of the engine, so that the engine operation noise is reduced, and meanwhile, the combustion efficiency and the oil consumption of the engine are ensured.
In some embodiments of the present invention, said adjusting the pressure of the first main injection and the start time of the second main injection according to the first crank angle comprises:
comparing the first crank angle with the first set crank angle and the second set crank angle respectively;
according to the fact that the first crank angle is larger than the first set crank angle and smaller than or equal to the second set crank angle, the pressure of the first main injection is increased;
according to the fact that the first crank angle is larger than the second set crank angle, the pressure of the first main injection is increased, and meanwhile the starting time of the second main injection is advanced;
and reducing the pressure of the first main injection according to the fact that the first crank angle is smaller than or equal to the first set crank angle.
In some embodiments of the invention, the first set point ranges from 45% to 55%.
In some embodiments of the invention, the engine includes a first combustion stage and a second combustion stage, the calibrating injection parameters of the first and second main injections based on the combustion heat release rate data and the crank angle data, further including:
determining a combustion heat release rate curve according to the combustion heat release rate data, and adjusting the fuel injection quantity of the first main injection according to the combustion heat release rate curve;
determining a second crank angle of the first combustion stage according to the combustion heat release rate data and the crank angle data, and adjusting the pressure of the second main injection according to the second crank angle;
and determining a combustion heat release rate interval of a second combustion stage according to the combustion heat release rate data, and readjusting the pressure of the second main injection according to the combustion heat release rate interval.
In some embodiments of the present invention, the adjusting the fuel injection amount of the first main injection according to the combustion heat release rate curve includes:
determining a first peak value of the first main injection and a second peak value of the second main injection according to the combustion heat release rate curve;
comparing the set multiple of the second peak value with the size of the first peak value;
reducing the oil injection quantity of the first main injection according to the condition that the first peak value is larger than the set multiple of the second peak value;
increasing the oil injection quantity of the first main injection according to the condition that the first peak value is smaller than the set multiple of the second peak value;
wherein the total amount of the fuel injection of the first main injection and the second main injection is unchanged, and the range of the set multiple is 0.5-0.7.
In some embodiments of the present invention, said adjusting the pressure of the first main injection and the start time of the second main injection according to the first crank angle comprises:
comparing the first crank angle with the first set crank angle and the second set crank angle respectively;
according to the fact that the first crank angle is larger than the first set crank angle and smaller than or equal to the second set crank angle, the pressure of the first main injection is increased;
according to the fact that the first crank angle is larger than the second set crank angle, the pressure of the first main injection is increased, and meanwhile the starting time of the second main injection is advanced;
and reducing the pressure of the first main injection according to the fact that the first crank angle is smaller than or equal to the first set crank angle.
In some embodiments of the invention, the first set point ranges from 45% to 55%.
In some embodiments of the invention, said adjusting the pressure of the second main injection according to the second crank angle comprises:
comparing the second crank angle with a third set crank angle;
according to the fact that the second crank angle is larger than the third set crank angle, the pressure of the second main injection is increased;
and reducing the pressure of the second main injection according to the fact that the second crank angle is smaller than the third set crank angle.
In some embodiments of the invention, the first combustion stage is a combustion stage having a combustion heat release rate of 10% to 90%.
In some embodiments of the invention, said readjusting the pressure of the secondary main injection according to the combustion heat release rate interval comprises:
the heat release rate interval is led to obtain a heat release rate leading curve;
determining a third peak value and a crank angle range of the combustion heat release rate interval according to the heat release rate derivative curve;
and adjusting the pressure of the second main injection again according to the third peak value and the crank angle range so that the third peak value is in a set peak value range and the crank angle range is in a set angle range.
In some embodiments of the invention, the second combustion phase is initiated from the highest combustion temperature of the engine to a combustion interval where the heat release rate is at a second set point, the second set point ranging from 80% to 90%.
The second invention provides a calibration device for fuel injection parameters of an engine, the calibration device is used for implementing the calibration method provided by the first aspect of the invention, and the calibration device comprises:
the data acquisition module is used for acquiring combustion heat release rate data and crank angle data in the working process of the engine;
the data processing module is used for calibrating injection parameters of the first main injection and the second main injection according to the combustion heat release rate data and the crank angle data;
the control module is used for controlling the engine to operate according to the initial double-main injection strategy and adjusting the operation parameters of the engine according to the calibrated injection parameters.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 schematically illustrates a flow chart of a calibration aspect according to an embodiment of the invention;
FIG. 2 schematically illustrates a second flowchart of a calibration method according to an embodiment of the invention;
FIG. 3 schematically illustrates a flow chart III of a calibration method according to an embodiment of the invention;
FIG. 4 schematically illustrates a flow chart four of a calibration method according to an embodiment of the invention;
FIG. 5 schematically illustrates a flow chart five of a calibration method according to an embodiment of the invention;
FIG. 6 schematically shows a flow chart six of a calibration method according to an embodiment of the invention;
FIG. 7 schematically illustrates a schematic diagram of a dual main injection strategy according to an embodiment of the present invention;
FIG. 8 schematically illustrates a comparison of combustion heat release rate curves before and after calibration according to an embodiment of the present invention;
FIG. 9 schematically illustrates a heat release rate derivative graph according to an embodiment of the invention;
fig. 10 schematically shows a schematic view of a calibration device according to an embodiment of the invention.
The reference numerals are as follows: 101. a data acquisition module; 102. a data processing module; 103. and a control module.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.
Fig. 1 schematically shows a flowchart of a calibration method according to an embodiment of the present invention, where the engine of the present embodiment adopts a dual main injection strategy including a first main injection and a second main injection, and referring to fig. 1, the calibration method of the engine injection parameters of the present embodiment includes the following steps:
s11, controlling the engine to operate according to an initial double-main-injection strategy;
s12, collecting combustion heat release rate data and crank angle data in the running process of the engine;
s13, calibrating injection parameters of the first main injection and the second main injection according to the combustion heat release rate data and the crank angle data. In step S13, calibrating injection parameters of the first main injection and the second main injection according to the combustion heat release rate data and the crank angle data, wherein the method comprises the following steps: and determining a first crank angle when the combustion heat release rate is at a first set value according to the combustion heat release rate data and the crank angle data, and adjusting the pressure of the first main injection and the starting time of the second main injection according to the first crank angle.
According to the calibration method of the embodiment, an engine is first controlled to operate according to an initial dual main injection strategy, wherein the initial dual main injection strategy is a preset injection strategy. And then based on an engine experiment bench, acquiring combustion heat release rate data and crank angle data of the engine, wherein the combustion heat release rate refers to the combustion heat release amount of 1Kmol of mixed gas in unit time or unit crank angle, and the combustion heat release rate data and the crank angle data can be acquired through a combustion analyzer connected to the experiment bench. And then determining optimal calibrated injection parameters of the first main injection and the second main injection according to the combustion heat release rate data and the crank angle data. After the process of determining the optimal calibration injection parameters, noise data, cylinder pressure curve data and an indicator diagram can be further obtained through the combustion analyzer so as to verify that the noise data of the engine after operation according to the determined calibration injection parameters is in a reasonable noise range, the in-cylinder pressure rising rate is in a reasonable pressure rising rate range and the combustion efficiency of the engine is in a reasonable range, and when the engine is operated with the calibrated injection parameters of the first main injection and the second main injection, the operation noise of the engine can be effectively reduced, the combustion efficiency of the engine can be ensured, and the oil consumption of a compressor can be reduced.
In connection with fig. 8, the combustion speed during the fuel combustion is dependent on the mixture formation speed. In order to ensure the economical efficiency of the engine working process, in the test calibration process, the combustion speed of the combustion heat release rate in the middle combustion stage is accelerated by raising the primary main injection pressure P1, and the first set value is the combustion heat release rate of the engine in the middle combustion stage, for example, the range of the first set value is 45% -55%, that is, the middle combustion stage is the stage with the combustion heat release rate of 45% -55%, and the preferred first set value is 50%. And determining a first crank angle when the combustion heat release rate is a first set value according to the combustion heat release rate data and the crank angle data acquired by the combustion analyzer in the test process to serve as a judgment basis, and adjusting the pressure of the first main injection and the starting time of the second main injection to ensure that the first crank angle when the combustion heat release rate is in the first set value is in a reasonable crank angle range, so that the quick progress of the combustion middle section is ensured, and the reaction speed of the combustion middle section is increased.
Fig. 2 schematically shows a second flowchart of a calibration method according to an embodiment of the present invention, and referring to fig. 2, the steps of adjusting the pressure of the first main injection and the start timing of the second main injection according to the first crank angle include:
s21, comparing the first crank angle with the first set crank angle and the second set crank angle respectively;
s22, raising the pressure of the first main injection according to the fact that the first crank angle is larger than the first set crank angle and smaller than or equal to the second set crank angle;
s23, according to the fact that the first crank angle is larger than the second set crank angle, the pressure of the first main injection is increased, and meanwhile the starting time of the second main injection is advanced;
s24, reducing the pressure of the first main injection according to the fact that the first crank angle is smaller than or equal to the first set crank angle.
According to the calibration method of the embodiment, after the first crank angle is determined, the pressure of the first main injection and the starting time of the second main injection are regulated and controlled by comparing the first crank angle with the first set crank angle and the second set crank angle, so that the first crank angle reaches the first set crank angle, the quick proceeding of the combustion process is ensured, and the reaction speed of the middle combustion stage is increased. When the first crank angle is larger than the first set crank angle and smaller than or equal to the second set crank angle, the first crank angle can be reduced to the first set crank angle by increasing the pressure of the first main injection, so that the quick proceeding of the middle combustion section is ensured. When the first crank angle is larger than the second set crank angle, the first crank angle cannot be reduced to the first set crank angle only by lifting the pressure of the first main injection, and the starting time of the second main injection is required to be advanced so as to ensure the quick progress of the middle combustion section. When the first crank angle is smaller than the first set crank angle, the first main injection pressure needs to be reduced so that the first crank angle is increased to the first set crank angle to ensure the performance of the engine. Illustratively, the first set crank angle is 8 ° CA to 10 ° CA, and the second set crank angle is 10 ° CA to 13 ° CA.
Fig. 3 schematically illustrates a flowchart three of a calibration method according to an embodiment of the present invention, and referring to fig. 3, the step of calibrating injection parameters of the first main injection and the second main injection based on the combustion heat release rate data and the crank angle data includes:
s31, determining a combustion heat release rate curve according to the combustion heat release rate data, and adjusting the fuel injection quantity of the primary main injection according to the combustion heat release rate curve.
According to the calibration method of the present embodiment, the heat release process in the initial combustion stage of the engine is suppressed to avoid the excessively rapid progress in the initial combustion stage, so that the in-cylinder pressure rise rate can be reduced, and noise can be reduced. Suppressing the exothermic process in the early stage of engine combustion can be achieved by controlling the injection amount of the first main injection. According to the method, after the combustion heat release rate data of the engine are obtained, the combustion heat release rate curve of the engine can be determined, and the combustion heat release rate curve reflects the combustion heat release rule in the working process of the engine. The combustion heat release rate curve of the dual main injection is typically bimodal, and fig. 8 shows a comparison of the combustion heat release rates before and after calibration, wherein the curve surrounding the dark gray region is the combustion heat release rate curve before adjustment, and the black solid line is the combustion heat release rate curve after adjustment. Referring to fig. 8, the magnitude of the first peak can be adjusted by adjusting the amount of fuel injected by the first main injection, thereby reducing the amount of heat released at the initial stage of heat release of combustion, reducing the in-cylinder pressure rise rate, and realizing noise reduction.
S32, determining a second crank angle of the first combustion stage according to the combustion heat release rate data and the crank angle data, and adjusting the pressure of the second main injection according to the second crank angle.
According to the calibration method of the present embodiment, the first combustion stage, which is a combustion continuation stage, for example, a combustion stage in which the combustion heat release rate is 10% to 90%, is controlled based on the calibration results of the initial combustion stage and the middle combustion stage according to the combustion heat release rate data and the crank angle data acquired in real time. Shortening the duration of the first combustion stage is beneficial to increasing combustion efficiency and reducing fuel consumption, and the combustion efficiency can be ensured by adjusting the pressure of the second main injection so that the second crank angle of the first combustion stage is within a reasonable angle range.
S33, determining a combustion heat release rate section of the second combustion stage according to the combustion heat release rate data, and adjusting the pressure of the second main injection again according to the combustion heat release rate section.
According to the calibration method of the present embodiment, the second combustion stage is a combustion afterburning stage of the engine. When the engine is in the second combustion phase, a longer combustion process results in a higher fuel consumption, and therefore the duration of the second combustion phase needs to be controlled, controlling the crank angle range of the second combustion phase. The second combustion stage is started from the highest combustion temperature of the engine to a combustion zone when the combustion heat release rate is at a second set value, and the range of the second set value is 80% -90%. In connection with fig. 8, the duration of the second combustion phase is shortened by adjusting the pressure of the second main injection again in accordance with the combustion heat release rate interval of the second combustion phase to ensure rapid progress of the second combustion phase.
In the present embodiment, the peak of the combustion heat release rate is controlled to control the slow progress of the initial combustion stage, so that the excessively fast progress of the in-cylinder pressure increase rate in the initial combustion stage is avoided, and the noise is suppressed. By controlling the injection process of the two main injections, the combustion speed in the middle and later stages is increased, so that the quick proceeding of the combustion process is ensured, and the problem that oil consumption and noise suppression in the traditional scheme cannot be simultaneously considered is solved. The heat release rate of the engine in the early combustion stage is low in the combustion process of the embodiment, noise is effectively restrained, the combustion efficiency is mainly guaranteed in the middle combustion stage, the rapid progress of the combustion process is guaranteed in the later combustion stage, and oil consumption is reduced.
Fig. 4 schematically shows a flowchart four of a calibration method according to an embodiment of the present invention, and referring to fig. 4, the step of adjusting the injection amount of the first main injection according to the combustion heat release rate curve includes:
s41, determining a first peak value of the first main injection and a second peak value of the second main injection according to the combustion heat release rate curve;
s42, comparing the set multiple of the second peak value with the size of the first peak value;
s43, reducing the oil injection quantity of the primary injection according to the fact that the first peak value is larger than the set multiple of the second peak value;
s44, increasing the oil injection quantity of the first main injection according to the fact that the first peak value is smaller than the set multiple of the second peak value.
According to the calibration method of the embodiment, a first peak value of the first main injection and a second peak value of the second main injection are determined according to the combustion heat release rate curve, and then a set multiple of the second peak value of the second main injection is compared with the size of the first peak value of the first main injection. Fig. 7 shows a schematic diagram of a dual main injection strategy according to this embodiment, where t1 is an injection timing of a first main injection, t2 is an injection timing of a second main injection, the first main injection starts injecting fuel before a piston of an engine reaches a top dead center, the second main injection starts injecting fuel after the piston of the engine reaches the top dead center, and areas of two solid line boxes are injection amounts of the first main injection and the second main injection, respectively. And when the first peak value is larger than the set multiple of the second peak value, reducing the oil injection quantity of the first main injection. The first peak value is too high, the fuel injection quantity of the first main injection needs to be reduced, so that the excessively rapid progress of the heat release rate in the initial stage of combustion is restrained, the in-cylinder pressure rising rate is reduced, noise is reduced until the first peak value is a set multiple of the second peak value, and the emission quantity of pollutants such as nitrogen oxides is not higher than that of the initial double main injection strategy. In order to ensure the performance of the engine, when the first peak value is smaller than the set multiple of the second peak value, the fuel injection quantity of the first main injection is increased. The total oil injection amount of the first main injection and the second main injection is unchanged, the oil injection amount of the first main injection is reduced, the oil injection amount of the second main injection is correspondingly increased, the oil injection amount of the first main injection is increased, the oil injection amount of the second main injection is correspondingly reduced, and the range of the set multiple is more than 0.5 and less than 0.7.
Fig. 5 schematically shows a flowchart five of a calibration method according to an embodiment of the invention, referring to fig. 5, the step of adjusting the pressure of the second main injection according to the second crank angle includes:
s51, comparing the second crank angle with a third set crank angle;
s52, according to the fact that the second crank angle is larger than the third set crank angle, the pressure of the second main injection is increased;
and S53, reducing the pressure of the second main injection according to the fact that the second crank angle is smaller than the third set crank angle.
According to the calibration method of the embodiment, after the second crank angle is obtained, the magnitude of the second crank angle is compared with that of the third set crank angle, when the second crank angle is larger than the third set crank angle, the pressure of the second main injection is increased, and when the second crank angle exceeds the third set crank angle, the combustion is slower, the combustion efficiency is lower, the fuel consumption is not easy to reduce, and meanwhile, the higher exhaust temperature is caused. It is therefore necessary to raise the pressure of the secondary main injection to achieve a reduction in combustion duration, typically no higher than the maximum injection pressure provided by the fuel system. In order to ensure the performance of the engine, when the second crank angle is smaller than the third set crank angle, the pressure of the second main injection is reduced. The first set crank angle is, for example, in the range of 35 ° CA to 45 ° CA.
Fig. 6 schematically shows a flowchart six of a calibration method according to an embodiment of the invention, and referring to fig. 6, the step of readjusting the pressure of the second main injection according to the third peak and crank angle range includes:
s61, deriving a combustion heat release rate interval to obtain a heat release rate derivative curve;
s62, determining a third peak value and a crank angle range of a combustion heat release rate interval according to the heat release rate derivative curve;
and S63, adjusting the pressure of the second main injection again according to the third peak value and the crank angle range.
According to the calibration method of the present embodiment, the combustion heat release rate interval in which the second combustion stage is located is first derived. In one possible implementation, the combustion heat release rate derivative curve θ is obtained by deriving the entire combustion heat release rate curve with reference to fig. 9, θ= dHR/d ϕ, where HR is the combustion heat release rate and ϕ is the crank angle. And then determining a heat release rate derivative curve of the second combustion stage according to the derivative graph of the whole combustion heat release rate curve, wherein the heat release rate derivative curve of the second combustion stage is a section between t4 and t5 in fig. 9. In another possible embodiment, the heat release rate derivative curve of the second combustion phase is obtained by deriving the combustion heat release rate interval in which the individual second combustion phase is located. After determining the heat release rate derivative curve, determining a third peak value and a crank angle range of the heat release rate derivative curve, referring to fig. 9, the third peak value is a position corresponding to t5, and adjusting the pressure of the second main injection to make the first peak value be in a set peak value range, wherein the set peak value range is, for example, -6 to-4, while ensuring that the crank angle range of the preset combustion section is in a set angle range, for example, 10-12 CA. For example, when the third peak exceeds the set peak range, the pressure of the second main injection is reduced, whereas when the third peak is lower than the set peak range, the pressure of the second main injection is increased. And when the crank angle range exceeds the set angle range, the pressure of the secondary main injection is increased, and otherwise, when the crank angle range is lower than the set angle range, the pressure of the secondary main injection is reduced. And the third peak value and the crank angle range are in the corresponding ranges, so that the combustion is facilitated to be rapidly carried out, the tail combustion section of the combustion is shortened, the combustion efficiency is ensured, and the oil consumption is reduced.
The present embodiment also provides a calibration device for implementing the calibration method, and fig. 10 is a schematic diagram of a calibration device according to an exemplary embodiment of the present invention, and referring to fig. 10, the calibration device includes:
the data acquisition module 101 is used for acquiring combustion heat release rate data and crank angle data in the working process of the engine;
the data processing module 102 is used for calibrating injection parameters of the first main injection and the second main injection according to the combustion heat release rate data and the crank angle data;
the control module 103, the control module 103 is used for controlling the engine to operate according to the initial double main injection strategy, and adjusting the operation parameters of the engine according to the calibrated injection parameters.
The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein. It should be noted that the above modules are the same as examples and application scenarios implemented by the corresponding steps, but are not limited to those disclosed in the above embodiments. The modules described above may be implemented in a hardware environment as part of an apparatus, either by software or by hardware.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (9)
1. The method for calibrating the fuel injection parameters of the engine is characterized in that the engine adopts a double main injection strategy comprising a first main injection and a second main injection, and the method comprises the following steps:
controlling the engine to operate according to an initial double-main-injection strategy;
collecting combustion heat release rate data and crank angle data in the running process of an engine;
calibrating injection parameters of the first main injection and the second main injection according to the combustion heat release rate data and the crank angle data;
the calibrating injection parameters of the first main injection and the second main injection according to the combustion heat release rate data and the crank angle data comprises the following steps:
determining a first crank angle of the combustion heat release rate at a first set value according to the combustion heat release rate data and the crank angle data, and adjusting the pressure of the first main injection and the starting time of the second main injection according to the first crank angle;
the engine comprises a first combustion stage and a second combustion stage, and the injection parameters of the first main injection and the second main injection are calibrated according to the combustion heat release rate data and the crank angle data, and the engine further comprises:
determining a combustion heat release rate curve according to the combustion heat release rate data, and adjusting the fuel injection quantity of the first main injection according to the combustion heat release rate curve;
determining a second crank angle of the first combustion stage according to the combustion heat release rate data and the crank angle data, and adjusting the pressure of the second main injection according to the second crank angle;
and determining a combustion heat release rate interval of a second combustion stage according to the combustion heat release rate data, and readjusting the pressure of the second main injection according to the combustion heat release rate interval.
2. The method for calibrating an engine fuel injection parameter according to claim 1, wherein said adjusting the pressure of the first main injection and the start timing of the second main injection according to the first crank angle comprises:
comparing the first crank angle with the first set crank angle and the second set crank angle respectively;
according to the fact that the first crank angle is larger than the first set crank angle and smaller than or equal to the second set crank angle, the pressure of the first main injection is increased;
according to the fact that the first crank angle is larger than the second set crank angle, the pressure of the first main injection is increased, and meanwhile the starting time of the second main injection is advanced;
and reducing the pressure of the first main injection according to the fact that the first crank angle is smaller than or equal to the first set crank angle.
3. The method for calibrating fuel injection parameters of an engine according to claim 1, wherein the range of the first set value is 45% -55%.
4. The method for calibrating an engine fuel injection parameter according to claim 1, wherein said adjusting the fuel injection amount of the first main injection according to the combustion heat release rate curve comprises:
determining a first peak value of the first main injection and a second peak value of the second main injection according to the combustion heat release rate curve;
comparing the set multiple of the second peak value with the size of the first peak value;
reducing the oil injection quantity of the first main injection according to the condition that the first peak value is larger than the set multiple of the second peak value;
increasing the oil injection quantity of the first main injection according to the condition that the first peak value is smaller than the set multiple of the second peak value;
wherein the total amount of the fuel injection of the first main injection and the second main injection is unchanged, and the range of the set multiple is 0.5-0.7.
5. The method for calibrating an engine fuel injection parameter according to claim 1, wherein said adjusting the pressure of the second main injection according to the second crank angle comprises:
comparing the second crank angle with a third set crank angle;
according to the fact that the second crank angle is larger than the third set crank angle, the pressure of the second main injection is increased;
and reducing the pressure of the second main injection according to the fact that the second crank angle is smaller than the third set crank angle.
6. The method for calibrating fuel injection parameters of an engine according to claim 5, wherein the first combustion stage is a combustion stage in which a combustion heat release rate is 10% -90%.
7. The method for calibrating an engine fuel injection parameter according to claim 1, wherein readjusting the pressure of the secondary main injection according to the combustion heat release rate interval comprises:
the heat release rate interval is led to obtain a heat release rate leading curve;
determining a third peak value and a crank angle range of the combustion heat release rate interval according to the heat release rate derivative curve;
and adjusting the pressure of the second main injection again according to the third peak value and the crank angle range.
8. The method of calibrating fuel injection parameters for an engine according to claim 7, wherein the second combustion phase is initiated from a highest combustion temperature of the engine to a combustion interval where a combustion heat release rate is at a second set point, the second set point ranging from 80% to 90%.
9. A calibration device for engine fuel injection parameters, characterized in that it is adapted to implement a calibration method according to any one of claims 1-8, said calibration device comprising:
the data acquisition module is used for acquiring combustion heat release rate data and crank angle data in the working process of the engine;
the data processing module is used for calibrating injection parameters of the first main injection and the second main injection according to the combustion heat release rate data and the crank angle data;
the control module is used for controlling the engine to operate according to the initial double-main injection strategy and adjusting the operation parameters of the engine according to the calibrated injection parameters.
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| CN101975118A (en) * | 2010-11-18 | 2011-02-16 | 天津大学 | Method and device for controlling emission of passenger car engine based on double jetting of fuels in cylinder |
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