CN113123911B - Parameter calibration method for split-injection main injection - Google Patents
Parameter calibration method for split-injection main injection Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
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Abstract
The invention relates to the technical field of engines, and discloses a parameter calibration method for split-injection main injection, which comprises the following steps: setting a first main injection reference starting angle, a first main injection reference oil injection quantity and a second main injection reference oil injection quantity through calibration parameters of a single main injection; and determining the reference interval angle under the conditions that the explosion pressure meets the standard explosion pressure and the discharge amount of the nitrogen oxides meets the standard discharge amount of the nitrogen oxides by taking the reference start angle of the first main injection, the reference fuel injection amount of the first main injection and the reference fuel injection amount of the second main injection as fixed quantities and the interval angle of the crank angle between the first main injection and the second main injection as a variable quantity. And then, taking the reference starting angle and the reference interval angle as quantification, adjusting the first main injection power-up time and the second main injection power-up time, and determining the first main injection calibration power-up time and the second main injection calibration power-up time so as to determine the first main injection calibration oil injection quantity and the second main injection calibration oil injection quantity. The calibration method reduces the calibration complexity.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a parameter calibration method for split-injection main injection.
Background
At present, multiple injection technology is widely applied to a high-pressure common rail diesel engine system, wherein multiple injection comprises pre-injection, main injection and post-injection, and the main purpose of the pre-injection is to reduce noise; the purpose of post-injection is to reduce soot and increase exhaust temperature.
The main optimization target of the multi-injection mode is before and after main injection, and the purpose of improving noise or emission is achieved by adding a part of trace injection, which can lead to increased oil consumption. And the application of the multiple injection has small influence on the main injection quantity, and the diesel oil contributing to the torque is sprayed into the cylinder with the maximum injection quantity in a short period, so that the mixing effect of the diesel oil and the air in the short period is poor, and the improvement of the heat efficiency is influenced to a certain extent.
In order to solve the problems, a novel multi-injection control strategy is provided, the main injection is divided into a first main injection process and a second main injection process, fuel oil is injected into a cylinder through the two main injections, the utilization rate of air in the cylinder of the engine is improved, and the combustion efficiency is further improved.
However, how to determine the parameters of the first main injection and the second main injection to achieve the optimal performance of the engine, and the calibration accuracy can be ensured while the calibration complexity is reduced is an urgent problem to be solved.
Disclosure of Invention
The invention aims to provide a parameter calibration method for split-injection main injection, which reduces the calibration complexity under multivariable and ensures the calibration accuracy.
In order to achieve the purpose, the invention adopts the following technical scheme:
a parameter calibration method for a split main injection comprises the following steps:
setting a first main injection reference starting angle, a first main injection reference oil injection quantity and a second main injection reference oil injection quantity through calibration parameters of a single main injection;
first-stage calibration: taking the reference start angle of the first main injection, the reference fuel injection quantity of the first main injection and the reference fuel injection quantity of the second main injection as fixed quantities, adjusting the interval angle of a crank angle between the first main injection and the second main injection, and taking the interval angle corresponding to the minimum fuel consumption of the first-stage engine as a reference interval angle under the condition that the explosion pressure is in a standard explosion pressure range and the discharge quantity of nitrogen oxides is in a standard discharge quantity of nitrogen oxides;
and second-stage calibration: and taking the reference starting angle and the reference interval angle as quantification, adjusting the first main injection power-up time and the second main injection power-up time, taking the first main injection power-up time corresponding to the minimum oil consumption of the second-stage engine as the first main injection calibration power-up time, taking the second main injection power-up time as the second main injection calibration power-up time, determining the first main injection calibration oil injection quantity through the first main injection calibration power-up time, and determining the second main injection calibration oil injection quantity through the second main injection calibration power-up time.
Optionally, the first main injection calibration power-on time and the second main injection calibration power-on time are both between 100 microseconds and 1500 microseconds.
Optionally, if the first main injection calibration injection quantity is Q1, and the second main injection calibration injection quantity is Q2, then Q2=0.05Q 1-0.5Q 1.
Optionally, after the step of the second-stage calibration, the method further includes:
and (3) third-stage calibration: and taking the first main injection calibration oil injection quantity and the second main injection calibration oil injection quantity as fixed quantities, adjusting the reference starting angle and the reference interval angle to obtain a starting angle and an interval angle corresponding to the minimum oil consumption of the third-stage engine, and comparing the minimum oil consumption of the third-stage engine with the minimum oil consumption of the second-stage engine to determine the calibration starting angle and the calibration interval angle.
Optionally, the reference start angle and the reference interval angle are adjusted within a range of ± 2 °.
Optionally, the range of the calibration start angle is 25 ° before top dead center to 10 ° after top dead center; the calibration interval angle is the corresponding crank angle when the interval time between the first main injection and the second main injection is 300-1200 microseconds.
Optionally, the standard explosion pressure is an explosion pressure when the engine injects fuel under the calibration parameters of the single main injection, and the standard nitrogen oxide emission is a nitrogen oxide emission when the engine injects fuel under the calibration parameters of the single main injection.
Optionally, the first main injection reference start angle is a calibrated start angle at a single main injection; the first main injection reference oil injection quantity and the second main injection reference oil injection quantity are the same and are half of the calibrated oil injection quantity in single main injection.
Optionally, the method for adjusting the crank angle interval angle between the first main injection and the second main injection comprises: and gradually increasing the interval angle from 0 degrees by set increment, and searching the interval angle corresponding to the minimum oil consumption of the engine in the first stage.
Optionally, the step of calibrating in the first stage further includes:
in adjusting the interval angle of the crank angle between the first main injection and the second main injection, if the explosion pressure cannot be satisfied within the range of the standard explosion pressure and/or the nitrogen oxide discharge amount cannot be satisfied within the range of the standard nitrogen oxide discharge amount, the reference start angle is adjusted to satisfy the requirements of the standard explosion pressure and the standard nitrogen oxide discharge amount according to changes in the explosion pressure and the nitrogen oxide discharge amount.
The invention has the beneficial effects that:
the invention provides a parameter calibration method of a fractional main injection, which sets a first main injection reference start angle, a first main injection reference oil injection quantity and a second main injection reference oil injection quantity through calibration parameters of a single main injection; and determining a reference interval angle through the first-stage calibration, and then determining a first main injection calibration oil injection quantity and a second main injection calibration oil injection quantity through the second-stage calibration. The parameter calibration method of the fractional main injection provided by the invention takes the calibration parameter of the single main injection as reference, adjusts the parameter of the fractional main injection under the condition of meeting the standard explosion pressure and the standard discharge amount of nitrogen oxides, and finally determines the parameter of the fractional main injection under the optimal performance of the engine, so that the oil consumption of the engine is minimum. The calibration method reduces the calibration complexity under multivariable and simultaneously ensures the calibration accuracy.
Drawings
FIG. 1 is a schematic diagram of the power-up time/crank angle for a split main injection provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating fuel injection amounts corresponding to the split main injection provided by the embodiment of the invention;
FIG. 3 is a schematic circumferential oil jet distribution of a single main injection in the prior art;
FIG. 4 is a schematic diagram illustrating circumferential distribution of oil bundles of the split main injection provided by the embodiment of the invention;
FIG. 5 is a flowchart of a method for calibrating parameters of the split main injection according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; 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 by those skilled in the art according to specific situations.
Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in direct contact with the second feature but being in contact with the second feature by 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.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The diesel engine is a main power source of the engineering machinery vehicle, but is also a main petroleum consumption source, the oil consumption of the diesel engine is continuously reduced, and the diesel engine has important significance for realizing energy conservation and emission reduction. At present, the high-pressure common rail technology becomes the mainstream configuration of the diesel engine, and the flexible control form provides various possibilities for improving the performance and the emission of the diesel engine. The existing high-pressure common rail technology can realize multiple injections, but the main injection form is main injection (injecting more than 80% of fuel oil) in the middle, and the front injection and the rear injection respectively have small injections (the injection amount accounts for about 10% -20%), and the main purpose is to reduce combustion noise (pre-injection, namely injection before main injection) or improve smoke emission and exhaust temperature thermal management (post-injection, namely injection after main injection). In the above form, most diesel oil is continuously sprayed in the main spraying stage, so that the oil-gas mixing effect is influenced, and the continuous improvement of the heat efficiency is limited.
As shown in fig. 1, the present embodiment provides a diesel split-injection control strategy, including a pilot injection, a main injection and a post injection, wherein the main injection is a split injection, including a first main injection and a second main injection, the parameters of the first main injection include a first main injection start angle α 1 (i.e., an angle of a crank angle corresponding to the time when the solenoid valve is energized for the first main injection) and an energization time β 1 (an energization time of the solenoid valve for the first main injection), and the parameters of the second main injection include an interval angle α 2 (i.e., a crank angle corresponding to the time between the first main injection and the second main injection) and an energization time β 2 (an energization time of the solenoid valve for the second main injection).
FIG. 2 is a diagram showing the injection pattern of the main split injection determined by the parameters of the first main injection and the second main injection, wherein the injection quantity of the first main injection is Q1, and the injection quantity of the second main injection is Q2.
As shown in FIG. 3, in the prior art, the fuel injected once by single main injection is too much, the fuel is excessively concentrated in the first region, and the fuel distribution area of the second region is small, so that the air utilization rate is low, and the fuel consumption is high. As shown in fig. 4, according to the diesel engine segmented injection control strategy provided by this embodiment, the main injection is injected twice, the fuel oil injected by the first main injection is distributed in the first region, and the fuel oil injected by the second main injection is distributed in the second region, so that the utilization rate of air in the engine cylinder is improved, and the combustion efficiency is further improved.
As shown in fig. 5, the present embodiment provides a parameter calibration method for a split main injection, where the split main injection includes a first main injection and a second main injection, and the parameter calibration method for the split main injection includes the following steps:
and S10, setting a first main injection reference start angle, a first main injection reference fuel injection quantity and a second main injection reference fuel injection quantity through calibration parameters of single main injection.
In this embodiment, under the fuel control strategy of pre-injection, single main injection and post-injection, the calibration parameters of the single main injection calibrated under the operation state with the minimum fuel consumption and the minimum discharge amount of nitrogen oxides of the engine can be used as the reference values of the sub main injection according to the conventional method for calibrating the parameters of the single main injection under the premise that the engine meets the requirement of nitrogen oxide discharge. Conventional methods for calibrating parameters for a single main injection are known in the art and will not be described in detail herein. It can be understood that the greater the explosion pressure of the engine, the more fuel is fully combusted in the engine, the more the engine does work, and the less fuel is consumed. The oil consumption is equal to the ratio of the oil injection quantity to the engine work power, and when the oil injection quantity is fixed, the more the engine works, the smaller the oil consumption.
Optionally, the first main injection reference start angle is a calibrated start angle at a single main injection; the reference fuel injection quantity of the first main injection is the same as that of the second main injection, and is half of the calibrated fuel injection quantity of the single main injection.
S20, first stage calibration: and taking the reference start angle of the first main injection, the reference fuel injection quantity of the first main injection and the reference fuel injection quantity of the second main injection as fixed quantities, adjusting the interval angle of the crank angle between the first main injection and the second main injection, and taking the interval angle corresponding to the minimum fuel consumption of the first-stage engine as a reference interval angle under the condition that the explosion pressure is in a standard explosion pressure range and the discharge quantity of nitrogen oxides is in a standard discharge quantity of nitrogen oxides.
Alternatively, the standard explosion pressure is the explosion pressure when the engine injects fuel under the calibrated parameters of the single main injection, and the standard nitrogen oxide emission is the nitrogen oxide emission when the engine injects fuel under the calibrated parameters of the single main injection.
The calibration parameters of the single main injection are calibrated under the condition that the engine meets the optimal injection strategy, and the optimal injection strategy means that the oil consumption of the engine is minimum and the emission of nitrogen oxides is minimum on the premise that the emission requirement of the nitrogen oxides is met. In the present embodiment, with reference to the explosion pressure that can be achieved by the optimal injection strategy of the single main injection and the discharge amount of nitrogen oxides, the fuel consumption of the split main injection is smaller because the combustion efficiency in the engine cylinder is higher when the split main injection is performed under the condition that the explosion pressure is the same as the explosion pressure of the single main injection and the discharge amount of nitrogen oxides is the same as the discharge amount of nitrogen oxides of the single main injection.
Alternatively, the adjustment method of the crank angle interval angle between the first main injection and the second main injection is: the interval angle is gradually increased from 0 degrees by set increment, and the interval angle corresponding to the minimum oil consumption of the engine in the first stage is searched. In this embodiment, the setting increment is not specifically limited, and those skilled in the art can set the increment according to actual situations. The minimum oil consumption of the first-stage engine is the minimum oil consumption when the interval angle is taken as a variable, and the minimum oil consumption of the first-stage engine is not necessarily the lowest oil consumption value which can be reached by the engine under the injection strategy of the split main injection.
Preferably, the step of first stage calibration further comprises:
in the process of adjusting the interval angle of the crank angle between the first main injection and the second main injection, if the explosion pressure cannot be met within the range of the standard explosion pressure and/or the nitrogen oxide discharge amount cannot be met within the range of the standard nitrogen oxide discharge amount, the reference start angle is adjusted according to the changes of the explosion pressure and the nitrogen oxide discharge amount so as to meet the requirements of the standard explosion pressure and the standard nitrogen oxide discharge amount.
In the process of adjusting the interval angle, there may be a case where the standard explosion pressure and/or the standard nitrogen oxide emission cannot be satisfied regardless of how the adjustment is made, and in this case, the reference start angle may be adjusted according to changes in the explosion pressure and the nitrogen oxide emission when the interval angle is different, and the reference start angle may be referred to as a first reference start angle, so that a second reference start angle and a reference interval angle that satisfy the standard explosion pressure and the standard nitrogen oxide emission are obtained.
S30, second stage calibration: and taking the reference starting angle and the reference interval angle as quantification, adjusting the first main injection power-up time and the second main injection power-up time, taking the first main injection power-up time corresponding to the minimum oil consumption of the second-stage engine as the first main injection calibration power-up time, taking the second main injection power-up time as the second main injection calibration power-up time, determining the first main injection calibration oil injection quantity through the first main injection calibration power-up time, and determining the second main injection calibration oil injection quantity through the second main injection calibration power-up time.
In the present embodiment, the minimum fuel consumption of the engine in the first stage is not necessarily the minimum fuel consumption of the engine. And adjusting the first main injection power-on time and the second main injection power-on time by taking the reference starting angle and the reference interval angle as quantification to obtain the minimum oil consumption of the second-stage engine. The minimum oil consumption of the engine in the second stage is less than that of the engine in the first stage.
It is understood that the longer the energization time, the larger the amount of fuel injected. In this embodiment, the main injection amount is obtained by looking up a table according to the acquired main injection energization time.
Optionally, the first main injection calibration power-on time and the second main injection calibration power-on time are both between 100 microseconds and 1500 microseconds.
Optionally, if the first main injection calibration injection quantity is Q1, and the second main injection calibration injection quantity is Q2, then Q2=0.05Q 1-0.5Q 1.
The method also comprises the following steps after the step of the second-stage calibration:
s40, third-stage calibration: and the minimum oil consumption of the engine in the third stage is compared with the minimum oil consumption of the engine in the second stage to determine the calibration starting angle and the calibration interval angle.
In this embodiment, in order to achieve the best performance of the engine, after determining the first main injection calibration fuel injection amount and the second main injection calibration fuel injection amount, the first main injection calibration fuel injection amount and the second main injection calibration fuel injection amount are taken as fixed amounts, and the reference start angle and the reference interval angle are finely adjusted, if the minimum fuel consumption of the third stage engine is smaller than the minimum fuel consumption of the second stage engine, the start angle corresponding to the minimum fuel consumption of the third stage engine is taken as the calibration start angle, and the interval angle corresponding to the minimum fuel consumption of the third stage engine is taken as the calibration interval angle. And if the minimum oil consumption of the engine in the third stage is greater than that of the engine in the second stage, taking a reference starting angle (a second reference starting angle) corresponding to the minimum oil consumption of the engine in the second stage as a calibration starting angle, and taking a reference interval angle corresponding to the minimum oil consumption of the engine in the second stage as a calibration interval angle.
Alternatively, the adjustment range of the reference start angle and the reference interval angle is ± 2 °.
Optionally, the calibration start angle ranges from 25 ° before top dead center to 10 ° after top dead center; the calibration interval angle is the corresponding crank angle when the interval time between the first main injection and the second main injection is 300-1200 microseconds.
In this embodiment, the parameter calibration method of the split main injection and the calibration parameter of the single main injection are stored in a controller of the engine, and the engine is further provided with a pressure sensor, a crank angle sensor and a water temperature sensor, wherein the pressure sensor is used for detecting fuel injection pressure, the crank angle sensor is used for detecting a crank angle, and the water temperature sensor is used for detecting the temperature of the coolant of the engine. The pressure sensor, the crank angle sensor, the water temperature sensor and the electromagnetic valve for controlling the injection of the injector are electrically connected with the controller and used for sending detection signals to the controller. The controller drives the injector to inject the fuel through the received detection signals of the various sensors. In the fuel injection control process, the controller controls the required injection quantity and the on-off of the electromagnetic valve. The connection mode and operation principle of the controller, the pressure sensor, the crank angle sensor, the water temperature sensor and the electromagnetic valve are already the prior art, and are not described herein again.
The controller calibrates the parameters of the fractional main injection according to the running state of the engine, the opening degree of an accelerator pedal, the calibration method of the parameters of the fractional main injection stored in the controller and the calibration parameters of the single main injection, and controls the fractional main injection of the engine according to the calibration parameters so as to realize the optimal performance of the engine. Monitoring of fuel consumption, explosion pressure and emissions of nitrogen oxides from an engine is well known in the art and will not be described in detail herein.
The parameter calibration method of the fractional main injection provided by the invention takes the calibration parameter of the single main injection as reference, adjusts the parameter of the fractional main injection under the condition of meeting the standard explosion pressure and the standard discharge amount of nitrogen oxides, and finally determines the parameter of the fractional main injection under the optimal performance of the engine, so that the oil consumption of the engine is minimum. The calibration method reduces the calibration complexity under multivariable and simultaneously ensures the calibration accuracy.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. A parameter calibration method for a split main injection is characterized in that the split main injection comprises a first main injection and a second main injection, and the parameter calibration method for the split main injection comprises the following steps:
setting a first main injection reference starting angle, a first main injection reference oil injection quantity and a second main injection reference oil injection quantity through calibration parameters of a single main injection;
first-stage calibration: taking the reference start angle of the first main injection, the reference fuel injection quantity of the first main injection and the reference fuel injection quantity of the second main injection as fixed quantities, adjusting the interval angle of a crank angle between the first main injection and the second main injection, and taking the interval angle corresponding to the minimum fuel consumption of the first-stage engine as a reference interval angle under the condition that the explosion pressure is in a standard explosion pressure range and the discharge quantity of nitrogen oxides is in a standard discharge quantity of nitrogen oxides;
and second-stage calibration: and taking the reference starting angle and the reference interval angle as quantification, adjusting the first main injection power-up time and the second main injection power-up time, taking the first main injection power-up time corresponding to the minimum oil consumption of the second-stage engine as the first main injection calibration power-up time, taking the second main injection power-up time as the second main injection calibration power-up time, determining the first main injection calibration oil injection quantity through the first main injection calibration power-up time, and determining the second main injection calibration oil injection quantity through the second main injection calibration power-up time.
2. The parameter calibration method for the split main injection according to claim 1, wherein the first main injection calibration power-on time and the second main injection calibration power-on time are both between 100 microseconds and 1500 microseconds.
3. The method for calibrating the parameters of the split main injection according to claim 2, wherein if the first main injection is calibrated to inject Q1 and the second main injection is calibrated to inject Q2, then Q2=0.05Q 1-0.5Q 1.
4. The method for calibrating the parameters of the split main injection according to claim 1, further comprising, after the step of calibrating the second stage:
and (3) third-stage calibration: and taking the first main injection calibration oil injection quantity and the second main injection calibration oil injection quantity as fixed quantities, adjusting the reference starting angle and the reference interval angle to obtain a starting angle and an interval angle corresponding to the minimum oil consumption of the third-stage engine, and comparing the minimum oil consumption of the third-stage engine with the minimum oil consumption of the second-stage engine to determine the calibration starting angle and the calibration interval angle.
5. The method for calibrating the parameters of the fractionated main injection according to claim 4, wherein the adjustment ranges of the reference start angle and the reference interval angle are ± 2 °.
6. The parameter calibration method for the split main injection according to claim 4, wherein the calibration start angle ranges from 25 ° before top dead center to 10 ° after top dead center; the calibration interval angle is the corresponding crank angle when the interval time between the first main injection and the second main injection is 300-1200 microseconds.
7. The parameter calibration method for the split main injection according to claim 1, wherein the standard explosion pressure is an explosion pressure when the engine injects fuel under the calibration parameters of the single main injection, and the standard nitrogen oxide emission is a nitrogen oxide emission when the engine injects fuel under the calibration parameters of the single main injection.
8. The parameter calibration method for the split main injection according to claim 1, wherein the first main injection reference start angle is a calibration start angle for a single main injection; the first main injection reference oil injection quantity and the second main injection reference oil injection quantity are the same and are half of the calibrated oil injection quantity in single main injection.
9. The parameter calibration method for the split main injection according to claim 1, wherein the adjustment method for the crank angle interval angle between the first main injection and the second main injection is as follows: and gradually increasing the interval angle from 0 degrees by set increment, and searching the interval angle corresponding to the minimum oil consumption of the engine in the first stage.
10. The method for calibrating parameters of the split main injection according to claim 1, wherein the step of the first-stage calibration further comprises:
in adjusting the interval angle of the crank angle between the first main injection and the second main injection, if the explosion pressure cannot be satisfied within the range of the standard explosion pressure and/or the nitrogen oxide discharge amount cannot be satisfied within the range of the standard nitrogen oxide discharge amount, the reference start angle is adjusted to satisfy the requirements of the standard explosion pressure and the standard nitrogen oxide discharge amount according to changes in the explosion pressure and the nitrogen oxide discharge amount.
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| CN114251182B (en) * | 2022-03-01 | 2022-06-21 | 潍柴动力股份有限公司 | Control method and device of oil injector, diesel engine and medium |
| CN116696582B (en) * | 2023-08-08 | 2023-10-20 | 潍柴动力股份有限公司 | Calibration method and calibration device for engine oil injection parameters |
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| CN106917694A (en) * | 2015-12-24 | 2017-07-04 | 马自达汽车株式会社 | The fuel injection control device and device of compression self-ignition engine |
| CN112780432A (en) * | 2021-01-04 | 2021-05-11 | 潍柴动力股份有限公司 | Method and device for correcting main fuel injection quantity of engine |
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