CN114251210B - Parameter calibration method of oil injection device - Google Patents
Parameter calibration method of oil injection device Download PDFInfo
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- CN114251210B CN114251210B CN202210189148.9A CN202210189148A CN114251210B CN 114251210 B CN114251210 B CN 114251210B CN 202210189148 A CN202210189148 A CN 202210189148A CN 114251210 B CN114251210 B CN 114251210B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention belongs to the technical field of diesel engines, and discloses a fuel injection device and a parameter calibration method thereof, wherein the fuel injection device comprises a first fuel injector and a second fuel injector, the first fuel injector and the second fuel injector are obliquely arranged on a cylinder cover, the first fuel injector comprises a first fuel injection nozzle, the first fuel injection nozzle is positioned in a combustion chamber, and a plurality of first fuel injection holes are arranged along the circumferential direction of the first fuel injection nozzle, so that fuel beams can be conveniently injected to the edge area of the combustion chamber; the second oil sprayer comprises a second oil sprayer which is positioned in the combustion chamber, a second oil spray hole and a third oil spray hole are formed in the second oil sprayer, the second oil spray hole faces the central area of the combustion chamber so that the oil beam sprayed by the second oil sprayer points to the central area of the combustion chamber, and the third oil spray hole faces the annular protrusion in the combustion chamber so that the oil beam sprayed by the second oil sprayer points to the annular protrusion of the combustion chamber.
Description
Technical Field
The invention relates to the technical field of diesel engines, in particular to an oil injection device and a parameter calibration method of the oil injection device.
Background
The piston is provided with a combustion chamber, the cylinder cover is vertically provided with an oil sprayer, and an oil nozzle of the oil sprayer is positioned in the central area of the combustion chamber, so that fuel oil is sprayed into the combustion chamber. The gas is fed through the gas inlet passage, and forms a swirl motion in the cylinder body of the cylinder along the cylinder wall spiral, and the swirl ratio is gradually reduced from the edge area to the central area of the cylinder body. In the process of piston operation, the oil injector starts to inject oil when the piston is close to a compression top dead center, an entrainment effect is formed at the tail end of an oil bundle, and the oil bundle is mixed with gas to form combustible mixed gas. However, the central area of the combustion chamber has a relatively small vortex, and the oil beams sprayed by the oil injector are mainly distributed in the edge area of the combustion chamber, so that fuel oil and gas are not mixed in the central area, and the air utilization rate is low.
Disclosure of Invention
The invention aims to provide an oil injection device, which improves the air utilization rate of the central area of a combustion chamber.
In order to achieve the purpose, the invention adopts the following technical scheme:
a fuel injection apparatus, comprising:
the first oil sprayer is obliquely arranged on the cylinder cover and comprises a first oil nozzle, wherein the first oil nozzle is positioned in the combustion chamber, and a plurality of first oil injection holes are formed in the circumferential direction of the first oil nozzle;
the second oil sprayer is obliquely arranged on the cylinder cover and comprises a second oil spray nozzle, the second oil spray nozzle is positioned in the combustion chamber, a second oil spray hole and a third oil spray hole are formed in the second oil spray nozzle, the second oil spray hole faces the central area of the combustion chamber, so that oil beams sprayed by the second oil spray nozzle point to the central area of the combustion chamber, and the third oil spray hole faces the annular bulge in the combustion chamber, so that the oil beams sprayed by the second oil spray nozzle point to the annular bulge in the combustion chamber.
Preferably, the second oil injector is provided with a fourth oil injection hole, and an oil beam emitted by the fourth oil injection hole is tangential to the rotation direction of the vortex.
Preferably, the included angle between the axis of the first fuel injector and the axis of the cylinder head is alpha1Wherein, the alpha is more than or equal to 10 degrees1Not more than 70 degrees, and the included angle between the axis of the second fuel injector and the axis of the cylinder cover is alpha2，10°≤α2≤70°。
Preferably, the second injector is provided with a plurality of second injection holes and a plurality of second injection holesThe third oil spray hole and the second oil spray hole have the aperture D1The diameter of the third oil spray hole is D2And D is2=（0.4~0.6）D1。
Preferably, an included angle between the axis of the second fuel injector and the oil beam emitted from the third fuel injection hole to the annular protrusion is beta2，50°≤β2≤75°。
The invention also provides a parameter calibration method of the oil injection device, which is used for calibrating the parameters of the oil injection device, wherein the parameters comprise the starting injection time and the injection pressure of the first oil injector and the starting injection time of the second oil injector, and the method comprises the following steps:
s1, before the piston runs to the compression top dead center, the first oil injector starts to inject;
s2, after the piston runs to a compression top dead center, the second oil injector starts to inject;
s3, calculating the heat release rate change rate according to the heat release rate;
and S4, judging whether the corresponding crank angle value is in a calibration range when the heat release rate change rate is positive or negative, if not, adjusting the parameters, and repeatedly executing S1-S4 until the corresponding crank angle value is in the calibration range when the heat release rate change rate is positive or negative.
Preferably, the calibration range is 5-10 ° CA, whether the corresponding numerical value of the crank angle is within the range of 5-10 ° CA is judged when the heat release rate change rate is positive or negative, and when the corresponding numerical value of the crank angle is within the range of 5-10 ° CA, the current parameter is used as the final parameter; when the corresponding numerical value of the crank angle is less than 5 degrees CA, delaying the injection starting time of the second fuel injector, and repeatedly executing S1-S4; and when the corresponding crank angle is larger than 10 degrees CA, advancing the injection starting time of the first fuel injector or increasing the injection pressure of the first fuel injector, and repeatedly executing S1-S4.
Preferably, in step S3, the amplifier is output by a combustion analyzerHeat rate according to the formula
Calculating the rate of heat release rate change, where HR is the rate of heat release,
theta is the crank angle, and theta is the heat release rate change rate.
Preferably, in step S4, the heat release rate change rate corresponding to the different crank angle values is measured at different times during one cycle, a plurality of discrete points are fitted to a curve based on the different crank angle values and the heat release rate change rate corresponding to the different crank angle values, the heat release rate change rate graph based on the crank angle is drawn, and the crank angle value corresponding to the heat release rate change rate when the heat release rate change rate is negative or positive is found by plotting, and then the determination is performed.
Preferably, the injection start timing of the first injector is t1And the injection starting time of the second fuel injector is t2Said t is1Before the piston runs to the compression top dead center, the numerical value of the crank angle is at any time within the range of 15-5 CA, and t is2And after the piston runs to the compression top dead center, the numerical value of the crank angle is at any time within the range of 3-5 CA degrees.
The invention has the beneficial effects that:
according to the oil injection device provided by the invention, the first oil injector and the second oil injector are obliquely arranged on the cylinder cover, the first oil injection hole of the first oil injector can inject the oil beam to the edge area of the combustion chamber, the second oil injection hole of the second oil injector can inject the oil beam to the central area of the combustion chamber, the third oil injection hole of the second oil injector can inject the oil beam to the annular bulge of the combustion chamber, and the first oil injector and the second oil injector are mutually matched, so that the flow field strength in the combustion chamber is enhanced, the uniformity of mixed gas in the combustion chamber is promoted, and the smoke intensity is reduced. When the second oil injection hole of the second oil injector injects fuel oil, the turbulent action of the oil beam is fully utilized, the high-speed jet flow continuously sucks air nearby in the advancing and expanding process, an entrainment effect is formed around the oil beam, and the air in the central area in the cylinder body of the cylinder is entrained into the flowing oil beam when the fuel oil is injected into the central area of the combustion chamber, so that the flow field strength of the central area in the cylinder is improved through the jet action of the oil beam, and the oil-gas mixing is promoted. Compared with the prior art that an oil sprayer structure vertically arranged on the cylinder cover is utilized, the second oil sprayer provided by the invention has the advantages that the second oil spraying hole sprays fuel oil to the central area of the combustion chamber, the third oil spraying hole sprays fuel oil to the annular bulge of the combustion chamber, and the fuel oil and air in the cylinder body of the cylinder are quickly mixed to form combustible mixed gas under the entrainment effect of oil bundles, so that the air in the cylinder is fully utilized.
The parameter calibration method of the oil injection device provided by the invention calculates the heat release rate change rate according to the heat release rate, judges according to the heat release rate change rate, and when the heat release rate change rate is changed from a positive value to a negative value, the crank angle is in a calibration range. If the corresponding crank angle is in the calibration range, the combustion speed of the combustion chamber in the fast combustion period is proved to be normal, and if the corresponding crank angle is not in the calibration range, the adjustment is carried out according to the actual situation. The parameter calibration method of the oil injection device provided by the invention has the advantages that the combustion speed in a fast combustion period in the combustion process of the combustion chamber is improved, the heat utilization rate is improved, and the dynamic property of a diesel engine is improved.
Drawings
FIG. 1 is a cross-sectional view of a fuel injection assembly disposed on a cylinder head in accordance with an embodiment of the present invention;
FIG. 2 is a graph showing the fuel injection law of the method for calibrating the parameters of the fuel injection device according to the embodiment of the present invention;
FIG. 3 is a graph of heat release rate variation with crank angle variation for a method of calibrating a parameter of a fuel injection apparatus according to an embodiment of the present invention;
fig. 4 is a flowchart of a parameter calibration method for a fuel injection device according to an embodiment of the present invention.
In the figure:
100. a cylinder head;
200. a combustion chamber; 201. an annular projection; 202. an upper layer pit; 203. a lower pit;
300. a piston;
1. a first fuel injector; 11. a first fuel injection nozzle;
2. a second fuel injector; 21. and a second oil jet.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings, not all of them.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or the first and second features being in contact, not directly, but via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the embodiments of the present invention, the terms "upper", "lower", "right", and the like are used based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplicity of operation, but do not indicate or imply that the device or element referred to 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" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The present embodiment provides a fuel injection apparatus, as shown in fig. 1, which includes a first fuel injector 1 and a second fuel injector 2, where the first fuel injector 1 and the second fuel injector 2 are both obliquely disposed on a cylinder head 100, the first fuel injector 1 includes a first fuel injection nozzle 11, the first fuel injection nozzle 11 is located in a combustion chamber 200, and a plurality of first fuel injection holes are disposed along a circumferential direction of the first fuel injection nozzle 11, so as to facilitate injecting a fuel bundle to an edge region of the combustion chamber 200; the second fuel injector 2 includes a second fuel injection nozzle 21, the second fuel injection nozzle 21 is located in the combustion chamber 200, a second fuel injection hole and a third fuel injection hole are arranged on the second fuel injection nozzle 21, the second fuel injection hole faces the central area of the combustion chamber 200 so that the fuel bundle sprayed from the second fuel injection nozzle 21 is directed to the central area of the combustion chamber 200, and the third fuel injection hole faces an annular protrusion 201 in the combustion chamber 200 so that the fuel bundle sprayed from the second fuel injection nozzle 21 is directed to the annular protrusion 201 of the combustion chamber 200. Specifically, an annular protrusion 201 is arranged in the combustion chamber 200 along the circumferential direction of the inner wall of the combustion chamber, the combustion chamber 200 is divided into an upper pit 202 and a lower pit 203 by the annular protrusion 201, the annular protrusion 201 of the combustion chamber 200 is also called as a piston throat position, and the third oil injection hole can inject oil beams towards the piston throat position.
According to the fuel injection device provided by the embodiment, the first fuel injector 1 and the second fuel injector 2 are arranged on the cylinder cover 100 in an inclined mode, the first fuel injection hole of the first fuel injector 1 can inject the fuel bundle to the edge area of the combustion chamber 200, the second fuel injection hole of the second fuel injector 2 can inject the fuel bundle to the central area of the combustion chamber 200, the third fuel injection hole of the second fuel injector 2 can inject the fuel bundle to the annular protrusion 201 of the combustion chamber 200, and the first fuel injector 1 and the second fuel injector 2 are matched with each other, so that the strength of a flow field in the combustion chamber 200 is enhanced, the uniformity of mixed gas in the combustion chamber 200 is promoted, and the generation of smoke intensity is reduced. When the second fuel injection hole of the second fuel injector 2 injects fuel, the turbulent action of the fuel bundle is fully utilized, the high-speed jet continuously sucks air nearby in the advancing and expanding process, an entrainment effect is formed around the fuel bundle, and the air in the central area of the cylinder body of the cylinder is entrained into the flowing fuel bundle when the fuel is injected into the central area of the combustion chamber 200, so that the flow field strength of the central area in the cylinder is improved through the jet action of the fuel bundle, and the oil-gas mixing is promoted. Compared with the prior art that a fuel injector structure vertically arranged on the cylinder cover 100 is utilized, in the fuel injection device provided by the embodiment, the second fuel injector 2 not only injects fuel to the central area of the combustion chamber 200, but also injects fuel to the annular protrusion 201 of the combustion chamber 200, and under the entrainment effect of the fuel bundles, the fuel injector and air in the cylinder body of the cylinder are rapidly mixed to form combustible mixed gas, so that the air in the cylinder is fully utilized.
Specifically, as shown in fig. 1, the mounting position of the first fuel injection nozzle 11 of the first injector 1 is located on the axis of the cylinder head 100, the mounting position of the second fuel injection nozzle 21 of the second injector 2 is at a distance L from the axis of the cylinder head 100, and the angle between the axis of the first injector 1 and the axis of the cylinder head 100 is α1Wherein, the alpha is more than or equal to 10 degrees1Is less than or equal to 70 degrees, in the embodiment, alpha1Is 32 deg., and the angle between the axis of the second injector 2 and the axis of the cylinder head 100 is alpha2，10°≤α2Is less than or equal to 70 degrees, in the embodiment, alpha2Is 42 deg.. In other embodiments, the angle of the sum is set as needed, e.g., α1Can be 10 degrees, 20 degrees, 30 degrees, 40 degrees, 50 degrees, 60 degrees or 70 degrees, alpha2And may be 10 °, 20 °, 30 °, 40 °, 50 °, 60 ° or 70 °. In addition, α is1And alpha2May or may not be equal. More specifically, the axis of the cylinder head 100, the axis of the first injector 1, and the axis of the second injector 2 are on the same plane.
Specifically, as shown in fig. 1, the first fuel injection hole of the first fuel injector 1 is capable of injecting fuel toward the annular protrusion 201 of the combustion chamber 200, and the angle between the fuel jet sprayed from the first fuel injection hole and the axis of the first fuel injector 1 is γ1And gamma2In the present embodiment, γ1Is 52 DEG and gamma2Is 111 deg.. The second fuel injection hole of the second fuel injector 2 injects fuel toward the central area of the combustion chamber 200, and the included angle between the fuel beam sprayed from the second fuel injection hole and the axis of the second fuel injector 2 is beta1In the present embodiment, β1Is 41 degrees, and the included angle between the axis of the second oil injector 2 and the oil beam which is jetted to the annular bulge 201 by the third oil injection hole is beta2，50°≤β275 deg. or less, in this example, beta2Is 111 deg..
Specifically, as shown in fig. 1, a plurality of second injection holes and a plurality of third injection holes are formed in the second injector 2, in this embodiment, the second injector 2 has a five-hole structure, three second injection holes are formed, two third injection holes are formed, and the diameter of the second injection hole is D1The diameter of the third oil spray hole is D2And D is2=（0.4~0.6）D1Setting up D2Is D10.4-0.6 times, the flow of the oil beam sprayed by the second oil sprayer 2 is distributed, and the oil beam can be uniformly distributed in the combustion chamber 200. In other embodiments, the number of the second oil injection holes and the third oil injection holes and the diameter D of the second oil injection holes are set according to actual needs1And the diameter D of the third oil spray hole2。
In other embodiments, a fourth oil injection hole may be provided on the second oil injector 2, gas is introduced through the gas inlet channel, a vortex motion that spirals along the cylinder wall is formed in the cylinder body, and an oil bundle emitted by the fourth oil injection hole is tangential to the rotation direction of the vortex, so as to further enhance the vortex ratio in the central area of the combustion chamber 200, and promote the oil-gas mixing in the cylinder.
The present embodiment further provides a parameter calibration method for a fuel injection device, which is used for calibrating the parameters of the fuel injection device, as shown in fig. 1 to 4, the parameters of the fuel injection device include the injection start time and the injection pressure of the first fuel injector 1, and the injection start time of the second fuel injector 2, and the parameter calibration method for the fuel injection device includes the following steps:
s1, before the piston 300 runs to the compression top dead center, the first oil injector 1 starts to inject;
s2, after the piston 300 runs to the compression top dead center, the second oil injector 2 starts to inject;
s3, calculating the heat release rate change rate according to the heat release rate;
s4, judging whether the corresponding crank angle value is in the calibration range when the heat release rate change rate is positive or negative, if not, adjusting the parameters, and repeatedly executing S1-S4 until the corresponding crank angle value is in the calibration range when the heat release rate change rate is positive or negative.
In addition, θ is a heat release rate change rate, and when θ > 0, the heat release rate is considered to be in the process of increasing, and when θ < 0, the heat release rate is considered to start to decrease.
According to the parameter calibration method of the oil injection device, the heat release rate change rate theta is obtained through calculation according to the heat release rate, judgment is conducted according to the heat release rate change rate theta, and when theta is changed from a positive value to a negative value, the crank angle is in a calibration range. If the corresponding crank angle is in the calibration range, the combustion speed of the combustion chamber 200 in the fast combustion period is proved to be normal, and if the corresponding crank angle is not in the calibration range, the adjustment is carried out according to the actual situation. The parameter calibration method of the oil injection device provided by the embodiment improves the combustion speed of the combustion chamber 200 in the fast combustion period in the combustion process, improves the heat utilization rate and improves the dynamic property of a diesel engine.
Specifically, as shown in fig. 4, before step S1, step S0 is further included, in the stage calibration process, the combustion analyzer is used for acquiring a cylinder pressure curve of each cycle of the engine, implementing the calibration of the cylinder pressure and monitoring the combustion heat release process, and the combustion analyzer is connected to the test stage and outputs the heat release rate through the combustion analyzer.
Specifically, in step S1, the injection start timing of the first injector 1 is t1The injection start timing of the second injector 2 is t2，t1The value of the crank angle is any time t before the piston 300 runs to the compression top dead center and is within the range of 15-5 CA2After the piston 300 runs to a compression top dead center, the value of the crank angle is within the range of 3-5 DEG CAAt any time.
In the present embodiment, as shown in fig. 2, the injection duration of the first injector 1 is T1The injection duration of the second injector 2 is T2，T1Time period and T2The time periods are partially overlapped, that is, the second fuel injector 2 starts to inject when the first fuel injector 1 is injecting fuel, so that the combustion speed in the fast burning period in the combustion process is improved, a dotted line frame in fig. 2 represents an injection rule when only one fuel injector is arranged in the prior art, and a solid line frame represents an injection rule under the combined action of the first fuel injector 1 and the second fuel injector 2 in the embodiment. In other embodiments, T1Time period and T2The time periods may not coincide, and after the first fuel injector 1 finishes injecting fuel, the second fuel injector 2 starts injecting fuel again.
Specifically, as shown in fig. 3, the heat release rate is output by the combustion analyzer in step S3 according to the formula
Performing a first derivation to calculate a rate of change of the heat release rate, wherein HR is the heat release rate,
is the crank angle, theta is the rate of change of the heat release rate.
In step S4, different crank angle values are associated at different times in a cycle, the heat release rate change rates associated with the different crank angle values are measured, a plurality of discrete points are fitted to a curve according to the different crank angle values and the heat release rate change rates associated with the different crank angle values, a heat release rate change rate graph based on the crank angle is drawn, the crank angle value corresponding to the heat release rate change rate with a positive rotation and a negative rotation is obtained by looking up the graph, and then the determination is performed. More specifically, in crank angle
Is taken as an X axis, the heat release rate change rate theta is taken as a Y axis, and the rotation angle is drawn based on a crank shaft
The graph of the heat release rate change rate theta can see that when theta is changed from a positive value to a negative value, the corresponding crank angle
According to the corresponding crank angle
And carrying out subsequent judgment.
Specifically, the calibration range is 5 ° CA to 10 ° CA, and after the piston 300 reaches the compression top dead center, as the combustion process of the combustion chamber 200 continues, the heat release rate change rate is positive or negative, and the crank angle is within the range of 5 ° CA to 10 ° CA, so in step S4, it is determined whether the value of the corresponding crank angle is within the range of 5 ° CA to 10 ° CA when the heat release rate change rate θ is positive or negative.
Judging whether the value of the corresponding crank angle is within the range of 5-10 CA when the heat release rate change rate is positive or negative, and taking the current parameter as the final parameter when the value of the corresponding crank angle is within the range of 5-10 CA; when the corresponding crank angle is smaller than 5 degrees CA, the combustion speed of the combustion chamber 200 in the fast combustion period is proved to be fast, the injection starting time of the second fuel injector 2 is delayed, and S1-S4 is repeatedly executed; when the corresponding crank angle is greater than 10 ° CA, it is verified that the combustion speed in the rapid combustion period in the combustion process of the combustion chamber 200 is slow, the injection start timing of the first injector 1 is advanced or the injection pressure of the first injector 1 is increased, and S1 to S4 are repeatedly performed.
Specifically, as shown in FIG. 3, the late stage of combustion means t3To t4During this period, in the later combustion period of the combustion process in the combustion chamber 200, when the variation value of the crank angle is larger than & gt 15 CA, i.e. t4Corresponding crank angle
Value of (a) and t3Corresponding crank angle
The difference between the values of (1) is larger than 15 degrees CA, the injection pressure of the second fuel injector 2 can be increased, the time of the stage is shortened as much as possible, the heat release process is accelerated, and the reaction speed of the combustion later stage of the combustion chamber 200 is improved.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A method for calibrating a parameter of a fuel injection device, the fuel injection device comprising:
the first oil sprayer (1) is obliquely arranged on a cylinder cover (100), the first oil sprayer (1) comprises a first oil nozzle (11), the first oil nozzle (11) is positioned in a combustion chamber (200), and a plurality of first oil injection holes are formed in the circumferential direction of the first oil nozzle (11);
a second fuel injector (2) disposed obliquely to the cylinder head (100), the second fuel injector (2) including a second fuel injection nozzle (21), the second fuel injection nozzle (21) being located in the combustion chamber (200), the second fuel injection nozzle (21) being provided with a second fuel injection hole and a third fuel injection hole, the second fuel injection hole being directed toward a central region of the combustion chamber (200) so that a fuel spray from the second fuel injection nozzle (21) is directed toward the central region of the combustion chamber (200), the third fuel injection hole being directed toward an annular protrusion (201) in the combustion chamber (200) so that a fuel spray from the second fuel injection nozzle (21) is directed toward the annular protrusion (201) of the combustion chamber (200);
a fourth oil injection hole is formed in the second oil injector (2), and an oil beam ejected by the fourth oil injection hole is tangential to the rotation direction of the vortex;
the parameter calibration method of the oil injection device calibrates the parameters of the oil injection device, wherein the parameters comprise the starting injection time and the injection pressure of a first oil injector (1) and the starting injection time of a second oil injector (2), and the parameter calibration method is characterized by comprising the following steps of:
s1, before the piston (300) runs to a compression top dead center, the first oil injector (1) starts to inject;
s2, after the piston (300) runs to the compression top dead center, the second fuel injector (2) starts to inject;
s3, calculating the heat release rate change rate according to the heat release rate;
s4, judging whether the corresponding crank angle value is in a calibration range when the heat release rate change rate is positive or negative, if so, proving that the combustion speed of a combustion chamber (200) in a flash period is normal, otherwise, adjusting the parameters, and repeatedly executing S1-S4 until the corresponding crank angle value is in the calibration range when the heat release rate change rate is positive or negative.
2. The parameter calibration method of the oil injection device according to claim 1, wherein the calibration range is 5 ° CA to 10 ° CA, and when the heat release rate change rate is determined to be positive or negative, the corresponding crank angle value is determined to be within 5 ° CA to 10 ° CA, and when the corresponding crank angle value is within 5 ° CA to 10 ° CA, the current parameter is used as a final parameter; when the corresponding crank angle value is less than 5 degrees CA, delaying the injection starting time of the second injector (2), and repeatedly executing S1-S4; and when the corresponding crank angle is larger than 10 degrees CA, advancing the injection starting time of the first injector (1) or increasing the injection pressure of the first injector (1), and repeatedly executing S1-S4.
3. Method for calibrating parameters of a fuel injection device according to claim 1, characterized in thatIn step S3, the heat release rate is output by the combustion analyzer according to the formula
Calculating the rate of heat release rate change, where HR is the rate of heat release,
theta is the crank angle, and theta is the heat release rate change rate.
4. The method for calibrating parameters of a fuel injection device according to claim 3, wherein in step S4, different values of crank angle are determined at different times during a cycle, the heat release rate change rate corresponding to the different values of crank angle is measured, a plurality of discrete points are fitted to a curve according to the different values of crank angle and the heat release rate change rate corresponding to the different values of crank angle, the heat release rate change rate graph based on the crank angle is drawn, and the values of crank angle corresponding to the heat release rate change rate when the heat release rate change rate is negative or positive are obtained by looking up the graph, and then the determination is performed.
5. Method for calibrating parameters of a fuel injection device according to claim 1, characterized in that in step S1 the injection start time of the first fuel injector (1) is t1The injection starting time of the second fuel injector (2) is t2Said t is1The value of the crank angle is any time when the piston (300) is operated to the position before the compression top dead center and the value of the crank angle is within the range of 15-5 DEG CA, and t2And after the piston (300) runs to the compression top dead center, the numerical value of the crank angle is within the range of 3-5 CA.
6. Method for calibrating the parameters of a fuel injection device according to claim 1, characterized in that the angle between the axis of said first injector (1) and the axis of said cylinder head (100) is α1Wherein, the alpha is more than or equal to 10 degrees1Not more than 70 degrees, and the included angle between the axis of the second fuel injector (2) and the axis of the cylinder cover (100) is alpha2，10°≤α2≤70°。
7. The method for calibrating the parameters of a fuel injection device according to claim 1, characterized in that said second injector (2) is provided with a plurality of said second injection holes and a plurality of said third injection holes, the diameter of said second injection holes being D1The diameter of the third oil spray hole is D2And D is2=（0.4~0.6）D1。
8. Method for calibrating the parameters of a fuel injection device according to claim 1, characterized in that the angle between the axis of the second injector (2) and the bundle of fuel injected by the third injector orifice towards the annular projection (201) is β2，50°≤β2≤75°。
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210189148.9A CN114251210B (en) | 2022-03-01 | 2022-03-01 | Parameter calibration method of oil injection device |
| PCT/CN2023/071531 WO2023165273A1 (en) | 2022-03-01 | 2023-01-10 | Fuel injection device and parameter calibration method for fuel injection device |
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| CN202210189148.9A CN114251210B (en) | 2022-03-01 | 2022-03-01 | Parameter calibration method of oil injection device |
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| CN114251210B true CN114251210B (en) | 2022-06-24 |
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| JP3024202B2 (en) * | 1990-11-05 | 2000-03-21 | 日産自動車株式会社 | Fuel injection device |
| US5365902A (en) * | 1993-09-10 | 1994-11-22 | General Electric Company | Method and apparatus for introducing fuel into a duel fuel system using the H-combustion process |
| JP2005054753A (en) * | 2003-08-07 | 2005-03-03 | Toyota Motor Corp | Fuel injection control device for internal combustion engine |
| US7243862B2 (en) * | 2004-04-07 | 2007-07-17 | Delphi Technologies, Inc. | Apparatus and method for mode-switching fuel injector nozzle |
| JP2009024683A (en) * | 2007-07-24 | 2009-02-05 | Hitachi Ltd | Injector with plurality of injection holes, cylinder gasoline injection type internal combustion engine with injector, and control method thereof |
| US8437945B2 (en) * | 2010-05-07 | 2013-05-07 | GM Global Technology Operations LLC | Method of multiple injection timing control |
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| CN114233544B (en) * | 2022-02-25 | 2022-06-24 | 潍柴动力股份有限公司 | Calibration method for cold start process of engine |
| CN114251210B (en) * | 2022-03-01 | 2022-06-24 | 潍柴动力股份有限公司 | Parameter calibration method of oil injection device |
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2022
- 2022-03-01 CN CN202210189148.9A patent/CN114251210B/en active Active
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- 2023-01-10 WO PCT/CN2023/071531 patent/WO2023165273A1/en unknown
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| JPS6036718A (en) * | 1983-08-08 | 1985-02-25 | Diesel Kiki Co Ltd | Direct injection type internal-combustion engine |
| CN1693690A (en) * | 2004-05-06 | 2005-11-09 | 株式会社电装 | Fuel injection system |
| JP2007291934A (en) * | 2006-04-25 | 2007-11-08 | Nissan Motor Co Ltd | Multi-hole injector |
| CN104832342A (en) * | 2015-03-12 | 2015-08-12 | 重庆科克发动机技术有限公司 | Engine fuel injector installation positioning structure |
| CN112879149A (en) * | 2021-01-25 | 2021-06-01 | 华中科技大学 | Asymmetric combustion chamber system suitable for high power density diesel engine |
| CN112879146A (en) * | 2021-01-25 | 2021-06-01 | 华中科技大学 | Main and auxiliary fuel injector system suitable for high-power-density diesel engine |
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| WO2023165273A1 (en) | 2023-09-07 |
| CN114251210A (en) | 2022-03-29 |
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