CN114251182B

CN114251182B - Control method and device of oil injector, diesel engine and medium

Info

Publication number: CN114251182B
Application number: CN202210189150.6A
Authority: CN
Inventors: 郭圣刚; 王德成; 刘晓鑫; 庞斌; 叶健; 周鹏; 谷允成; 蔡志勇; 李志杰
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2022-03-01
Filing date: 2022-03-01
Publication date: 2022-06-21
Anticipated expiration: 2042-03-01
Also published as: CN114251182A

Abstract

The invention discloses a control method and device of an oil sprayer, a diesel engine and a medium. Determining a working point area of the diesel engine through an external characteristic curve and a universal characteristic curve of the diesel engine, and respectively executing fuel injection control operation of the fuel injector corresponding to the working point area on the basis of the first main injection time, the first main injection pressure, the first main injection duration, the second main injection time, the second main injection pressure and the second main injection duration of the fuel injector. The problem that the reliability and the emission performance of the diesel engine are difficult to coordinate on the premise of meeting the economical efficiency due to the fact that one-time main injection is mainly carried out in an oil injection strategy in the existing diesel engine is solved, the injection strategies of double main injections of the oil injector are respectively controlled according to the working condition point area of the actual operation of the diesel engine, the exhaust temperature is improved in a targeted mode, the emission is reduced, and the power, the economical efficiency and the reliability are mutually coordinated.

Description

Control method and device of oil injector, diesel engine and medium

Technical Field

The invention relates to the technical field of diesel engine control, in particular to a method and a device for controlling an oil sprayer, a diesel engine and a medium.

Background

In the operation process of the existing diesel engine, in each work doing cycle, one-time main spraying is carried out through an oil sprayer arranged in a combustion system, and the requirements of an in-cylinder air system are different due to different operation rotating speeds and load rates aiming at different working condition points. Meanwhile, on the premise of ensuring economy and reliability, the emission characteristic is difficult to be considered.

Disclosure of Invention

The invention provides a control method and device of an oil sprayer, a diesel engine and a medium, and aims to solve the problems of high exhaust temperature and high NOx emission of the conventional diesel engine.

According to an aspect of the present invention, there is provided a control method of an injector, the control method of an injector including:

acquiring an external characteristic curve and a universal characteristic curve of a diesel engine, and determining a working condition point area where the diesel engine is located according to the external characteristic curve and the universal characteristic curve;

respectively determining the first main injection time, the first main injection pressure, the first main injection duration, the second main injection time, the second main injection pressure and the second main injection duration of the oil injector according to the working condition point region;

performing an injector injection control operation corresponding to the operating point region based on the first main injection timing, the first main injection pressure, the first main injection duration, the second main injection timing, the second main injection pressure, and the second main injection duration, respectively.

Optionally, the operating point region is a first type of operating point region;

respectively determining first type first main injection time, first type first main injection pressure, first type first main injection duration, first type second main injection time, first type second main injection pressure and first type second main injection duration of the oil injector in the first type operating point area according to the first type operating point area;

performing an injector injection control operation corresponding to the operating point region based on the first main injection timing, the first main injection pressure, the first main injection duration, the second main injection timing, the second main injection pressure, and the second main injection duration, respectively, including:

controlling the oil injector to inject a first type of first main injection oil quantity at the first type of first main injection time, wherein the injection pressure is the first type of first main injection pressure, and the first type of first main injection oil quantity is injected continuously for the first type of first main injection duration;

and controlling the oil injector to inject the first type of second main injection oil quantity at the first type of second main injection time, wherein the injection pressure is the first type of second main injection pressure, and the first type of second main injection oil quantity is injected continuously for the first type of second main injection duration.

Optionally, the pressure value of the first type second main injection pressure is greater than the pressure value of the first type first main injection pressure;

the first type second main injection oil amount is larger than the first type first main injection oil amount.

Optionally, the operating point region is a second type of operating point region;

respectively determining a second type first main injection time, a second type first main injection pressure, a second type first main injection duration, a second type second main injection time, a second type second main injection pressure and a second type second main injection duration of the oil injector in the second type operating point region according to the second type operating point region;

controlling the oil injector to inject a second type of first main injection oil quantity at the second type of first main injection time, wherein the injection pressure is the second type of first main injection pressure, and the second type of first main injection oil quantity is injected for the second type of first main injection duration;

and controlling the oil injector to inject a second secondary main injection oil quantity at the second secondary main injection time, wherein the injection pressure is the second secondary main injection pressure, and the second secondary main injection oil quantity is injected continuously for the second secondary main injection duration.

Optionally, the pressure value of the second type second main injection pressure is greater than the pressure value of the second type first main injection pressure;

the second type of second main oil injection amount is larger than the second type of first main oil injection amount.

Optionally, the operating point region is a third type of operating point region;

respectively determining a third type first main injection time, a third type first main injection pressure, a third type first main injection duration, a third type second main injection time, a third type second main injection pressure and a third type second main injection duration of the fuel injector in the third type operating point region according to the third type operating point region;

controlling the oil injector to inject a third type first main injection oil quantity at the third type first main injection time, wherein the injection pressure is the third type first main injection pressure, and the third type first main injection oil quantity is injected for the third type first main injection duration;

and controlling the oil injector to inject a third secondary main injection oil quantity at the third secondary main injection time, wherein the injection pressure is the third secondary main injection pressure, and the third secondary main injection oil quantity is injected continuously for the third secondary main injection duration.

Optionally, the operating point region is a fourth type of operating point region;

respectively determining the fourth type first main injection time, the fourth type first main injection pressure and the fourth type first main injection duration of the oil injector in the fourth type operating point region according to the fourth type operating point region;

and controlling the oil injector to inject the fourth type of first main injection oil mass at the fourth type of first main injection time with the injection pressure being the fourth type of first main injection pressure and lasting the fourth type of first main injection time duration.

According to another aspect of the present invention, there is provided a control device of an injector, including:

the operating point region determining module is used for acquiring an external characteristic curve and a universal characteristic curve of the diesel engine and determining an operating point region where the diesel engine is located according to the external characteristic curve and the universal characteristic curve;

the fuel injector information determining module is used for respectively determining the first main injection time, the first main injection pressure, the first main injection duration, the second main injection time, the second main injection pressure and the second main injection duration of the fuel injector according to the working condition point region;

and the fuel injection control module is used for executing fuel injector fuel injection control operation corresponding to the operating point region respectively based on the first main injection time, the first main injection pressure, the first main injection duration, the second main injection time, the second main injection pressure and the second main injection duration.

According to another aspect of the present invention, there is provided a diesel engine including:

at least one processor; and

a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,

the memory stores a computer program executable by the at least one processor, the computer program being executable by the at least one processor to enable the at least one processor to perform a method of controlling a fuel injector according to any one of the embodiments of the invention.

According to another aspect of the invention, a computer readable storage medium is provided, which stores computer instructions for causing a processor to implement a method of controlling a fuel injector according to any one of the embodiments of the invention when executed.

According to the technical scheme of the embodiment of the invention, the working condition point area of the diesel engine is determined through the external characteristic curve and the universal characteristic curve of the diesel engine, and the fuel injection control operation of the fuel injector corresponding to the working condition point area is respectively executed on the basis of the first main injection time, the first main injection pressure, the first main injection duration, the second main injection time, the second main injection pressure and the second main injection duration of the fuel injector. The problem that the reliability and the emission performance of the diesel engine are difficult to coordinate on the premise of meeting the economical efficiency due to the fact that one-time main injection is mainly carried out in the existing diesel engine oil injection strategy is solved, the injection strategy of double main injections of the oil injector is respectively controlled according to the actual operation working condition point area of the diesel engine, the exhaust temperature is improved in a targeted mode, the emission is reduced, and the power performance, the economical efficiency and the reliability are mutually coordinated.

It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.

Drawings

By way of brief introduction, it is clear that the drawings in the following description are only some embodiments of the invention, from which other drawings can be derived by a person skilled in the art without inventive effort.

FIG. 1 is a flow chart of a method of controlling a fuel injector according to one embodiment of the present disclosure;

FIG. 2 is a schematic diagram illustrating the division of the operating point region where a diesel engine is located according to an embodiment of the present invention;

FIG. 3 is a flowchart of a method of controlling a fuel injector according to a second embodiment of the present invention;

FIG. 4 is a schematic illustration of a fuel injector injection strategy in a first class of operating point regions provided in accordance with a second embodiment of the present invention;

FIG. 5 is a schematic illustration of a fuel injector injection strategy in a second class of operating point regions provided in accordance with a second embodiment of the present invention;

FIG. 6 is a schematic diagram illustrating a comparison of in-cylinder average temperature of dual main injection and primary main injection of an injector according to a second embodiment of the present disclosure;

FIG. 7 is a schematic in-cylinder average temperature for dual main injection of a fuel injector according to a second embodiment of the present disclosure;

FIG. 8 is a schematic illustration of a fuel injector injection strategy in a third class of operating point regions provided in accordance with a second embodiment of the present invention;

FIG. 9 is a schematic diagram illustrating the spatial additive effect of entrainment effect of dual main jets of a fuel injector according to a second embodiment of the present disclosure;

FIG. 10 is a schematic illustration of a fuel injector injection strategy according to a second embodiment of the present disclosure in a fourth class of operating point regions;

fig. 11 is a schematic structural diagram of a control apparatus of a fuel injector according to a third embodiment of the invention;

fig. 12 is a schematic structural diagram of a diesel engine implementing a method of controlling an injector according to an embodiment of the invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Example one

Fig. 1 is a flowchart of a method for controlling an injector according to an embodiment of the present invention, where the embodiment is applicable to specifically improve conditions of high exhaust temperature and emission reduction by using a dual main injection technique of an injector according to requirements of different operating point region ranges, the method for controlling the injector may be executed by a control device of the injector, the control device of the injector may be implemented in a form of hardware and/or software, and the control device of the injector may be configured in a diesel vehicle. As shown in fig. 1, the control method of the fuel injector includes:

s110, acquiring an external characteristic curve and a universal characteristic curve of the diesel engine, and determining a working point area where the diesel engine is located according to the external characteristic curve and the universal characteristic curve.

The external characteristic curve of the diesel engine is a curve when the throttle valve is fully opened, speed characteristic tests are carried out under different throttle valve opening degrees, speed characteristic curves of all throttle valve opening degrees can be drawn, the curves are approximately parallel, the larger the throttle valve opening degree is, the higher the curve is in the longitudinal direction, the speed characteristic curve when the throttle valve is fully opened is positioned at the highest position, and the speed characteristic curves of other throttle valve opening degrees smaller than the throttle valve is basically covered. Since this curve is located on the outermost side, it is called the outer characteristic curve.

In the bench test of the external characteristic curve of the diesel engine, the rotating speed of the diesel engine is controlled by a dynamometer, and at the moment, although the opening degree of a throttle valve is unchanged, the resistance of the dynamometer is controlled to control a single variable of the rotating speed of the diesel engine, so that the external characteristic curve is obtained.

Both the speed characteristic and the load characteristic of the diesel engine can only express the relationship between two parameters, and in order to express the relationship between three or more parameters, a multi-parameter characteristic, namely a universal characteristic, can be adopted.

The universal characteristic curve of the diesel engine is also called a universal map of the diesel engine, the left ordinate is the output torque of the diesel engine (the unit of torque is N.m), the abscissa is the rotating speed of the diesel engine (the unit of rotating speed is rpm), the right ordinate is the average effective pressure of a working cylinder of the diesel engine, the curve in the graph is the oil consumption, the minimum circle is the minimum fuel economy, and then the curve is slowly diffused.

It can be known that the universal characteristic is that the rotating speed is used as an abscissa, the torque is used as an ordinate, and an equivalent curve family of a plurality of important characteristic parameters is drawn on the graph.

In this embodiment, the operating point region where the diesel engine is located may be divided according to the external characteristic curve and the universal characteristic curve of the diesel engine, and the specific division of the operating point region is shown in fig. 2, where the operating point region where the diesel engine is located includes a first type operating point region (i), a second type operating point region (ii), a third type operating point region (iii), and a fourth type operating point region (iv).

And S120, respectively determining the first main injection time, the first main injection pressure, the first main injection duration, the second main injection time, the second main injection pressure and the second main injection duration of the oil injector according to the operating point region.

With continued reference to fig. 2, the first-class operating point region includes a region for high-speed and high-load operating points, i.e., the region where the speed of the diesel engine is above 1500rpm and the exhaust temperature is above 500 ℃.

And respectively determining the first type of first main injection time, the first type of first main injection pressure, the first type of first main injection duration, the first type of second main injection time, the first type of second main injection pressure and the first type of second main injection duration of the oil injector in the first type of operating point region according to the first type of operating point region.

The second type of operating point region II comprises the operating points aiming at low speed and high load, namely the region with the excess air coefficient less than 1.3 and the rotating speed of the diesel engine lower than 1200 rpm.

And respectively determining the second type first main injection time, the second type first main injection pressure, the second type first main injection duration, the second type second main injection time, the second type second main injection pressure and the second type second main injection duration of the oil injector in the second type operating point region according to the second type operating point region.

The third type of operating point region c includes a region aiming at a high-speed low-load operating point, namely the rotating speed of the diesel engine is more than 1500rpm and the exhaust temperature is lower than 500 ℃.

And respectively determining the third type first main injection time, the third type first main injection pressure, the third type first main injection duration, the third type second main injection time, the third type second main injection pressure and the third type second main injection duration of the fuel injector in the third type operating point region according to the third type operating point region.

The fourth type of operating point area fourth includes a normal starting operating point, and at the time, the fuel economy is the best, and the best fuel economy can be obtained by adopting a one-time main injection mode in the fourth type of operating point area.

And respectively determining the fourth type first main injection time, the fourth type first main injection pressure and the fourth type first main injection duration of the oil injector in the fourth type operating point region according to the fourth type operating point region.

S130, respectively executing fuel injection control operation of the fuel injector corresponding to the operating point region based on the first main injection time, the first main injection pressure, the first main injection duration, the second main injection time, the second main injection pressure and the second main injection duration.

Aiming at a high-speed high-load working condition region with high exhaust temperature in the universal characteristic of a diesel engine, namely a first-class working condition point region, because the load is high, the fuel injection quantity is large and is limited by reliability, the exhaust temperature of the partial region is difficult to improve by changing the advance angle mode. In the implementation, the fuel injector adopts a double-main-injection mode, so that the duration time of the middle and later stages of combustion is shortened, and the temperature in the cylinder is obviously reduced in the process of descending the piston at the later stage of the power stroke of the diesel engine.

Specifically, the fuel injector is controlled to inject a first type of first main injection quantity at the first type of first main injection time, wherein the injection pressure is the first type of first main injection pressure, and the first type of first main injection quantity is injected continuously for the first type of first main injection duration; and controlling the oil injector to inject the first type of second main injection oil quantity at the first type of second main injection time, wherein the injection pressure is the first type of second main injection pressure, and the first type of second main injection oil quantity is injected continuously for the first type of second main injection duration.

Wherein the pressure value of the first type second main injection pressure is greater than the pressure value of the first type first main injection pressure; the first type second main injection oil amount is larger than the first type first main injection oil amount.

Aiming at a low-rotating-speed high-load area with the universal characteristics of the diesel engine, namely a second type working condition point area II, the excessive air in a cylinder in the area is low, the load is high, the combustion temperature in the cylinder is high, the rotating speed of the diesel engine is low, the absolute time of circulation in each cylinder is long, and the generation amount of NOx is high. In the embodiment, the fuel injector adopts a double-main-injection mode, the fuel quantity of the original main injection is divided into two main injections, and the peak value of the injection temperature is reduced, so that the temperature in the cylinder is reduced.

Specifically, the fuel injector is controlled to inject the second type of first main injection oil quantity at the second type of first main injection time, wherein the injection pressure is the second type of first main injection pressure, and the second type of first main injection oil quantity is injected continuously for the second type of first main injection duration; and controlling the oil injector to inject a second secondary main injection oil quantity at the second secondary main injection time, wherein the injection pressure is the second secondary main injection pressure, and the second secondary main injection oil quantity is injected continuously for the second secondary main injection duration.

Wherein the pressure value of the second type second main injection pressure is greater than the pressure value of the second type first main injection pressure; the second type of second main oil injection amount is larger than the second type of first main oil injection amount.

Aiming at a high-speed low-load region in the universal characteristic of the diesel engine, namely a third type working condition point region III, the rail pressure is lower, so that the oil consumption of the diesel engine is increased, the rail pressure is increased, the emission of NOx is higher, the cycle time is short, the reoxidation time is shorter, and the smoke intensity is higher. In the embodiment, the fuel injector adopts a double-main-injection mode to achieve the purpose of improving smoke intensity emission.

Specifically, the fuel injector is controlled to inject the third type of first main injection oil mass at the third type of first main injection time with the injection pressure being the third type of first main injection pressure and lasting for the third type of first main injection duration; and controlling the oil injector to inject a third secondary main injection oil quantity at the third secondary main injection time, wherein the injection pressure is the third secondary main injection pressure, and the third secondary main injection oil quantity is injected continuously for the third secondary main injection duration.

Wherein the pressure value of the third type second main injection pressure is greater than the pressure value of the third type first main injection pressure; the third type of second main oil injection amount is greater than the third type of first main oil injection amount.

Aiming at the fourth type of working condition point area IV in the universal characteristics of the diesel engine, fuel is injected into the cylinder near the top dead center by adopting a one-time main injection mode, and the best fuel economy is obtained.

Specifically, the fuel injector is controlled to inject the fourth type of first main injection oil mass at the fourth type of first main injection time with the injection pressure being the fourth type of first main injection pressure and lasting for the fourth type of first main injection duration.

On the basis of the embodiment, before the fuel injection control operation of the fuel injector corresponding to the operating point region is executed, the fuel injector is controlled to execute the first pilot injection operation and the second pilot injection operation.

The first pilot injection operation and the second pilot injection operation may be performed by using a conventional injector pilot injection method, which is not limited in this embodiment.

According to the technical scheme of the embodiment of the invention, the working condition point area of the diesel engine is determined through the external characteristic curve and the universal characteristic curve of the diesel engine, and the fuel injection control operation of the fuel injector corresponding to the working condition point area is respectively executed on the basis of the first main injection time, the first main injection pressure, the first main injection duration, the second main injection time, the second main injection pressure and the second main injection duration of the fuel injector. The problem that the reliability and the emission performance of the diesel engine are difficult to coordinate on the premise of meeting the economical efficiency due to the fact that one-time main injection is mainly carried out in an oil injection strategy in the existing diesel engine is solved, the injection strategies of double main injections of the oil injector are respectively controlled according to the working condition point area of the actual operation of the diesel engine, the exhaust temperature is improved in a targeted mode, the emission is reduced, and the power, the economical efficiency and the reliability are mutually coordinated.

Example two

Fig. 3 is a flowchart of a method for controlling an injector according to a second embodiment of the present invention, where the present embodiment details a dual main injection control operation process of the injector in different operating point regions of a diesel engine based on the second embodiment. As shown in fig. 3, the control method of the injector includes:

s210, obtaining an external characteristic curve and a universal characteristic curve of the diesel engine, and determining a working condition point area where the diesel engine is located according to the external characteristic curve and the universal characteristic curve, wherein the working condition point area comprises a first type working condition point area, a second type working condition point area, a third type working condition point area and a fourth type working condition point area.

S211, respectively determining a first type first main injection time t11, a first type first main injection pressure p11, a first type first main injection duration d11, a first type second main injection time t12, a first type second main injection pressure p12 and a first type second main injection duration d12 of the fuel injector in the first type operating point region according to the first type operating point region.

The first main injection time is the time before the piston reaches the top dead center, and here, the first main injection time of the first type is the time before the piston reaches the top dead center.

S212, controlling the fuel injector to inject a first main fuel injection quantity m11 at the first main injection time t11, wherein the injection pressure is the first main injection pressure p11, and the first main injection duration d11 lasts.

S213, controlling the oil injector to inject the first-type second main injection oil quantity m12 at the first-type second main injection time t12, wherein the injection pressure is the first-type second main injection pressure P12, and the first-type second main injection duration d12 is continued.

Referring to fig. 4, the operating point region where the diesel engine is located is a first-type operating point region, during the working process of the diesel engine, before a piston reaches a top dead center, a first-type main injection is executed at a first-type first-main injection time t11 by using the injection pressure of a first-type first-main injection pressure p11 through an oil injector installed at the bottom of a cylinder cover, the first-type first-main injection amount m11 is controlled by controlling the duration of the first-type first-main injection duration d11, and a mixed gas is formed after atomization and crushing to perform combustion work. Then, along with the working stroke, the piston starts to move downwards, the fuel injector executes the second main injection at the first second main injection time t12 under the pressure of the first second main injection pressure P12, and the injection duration of the whole working process is shortened through the second injection, so that the combustion speed in the middle and later combustion periods is accelerated, and the exhaust temperature is reduced.

Wherein the pressure value of the first type second main injection pressure P12 is greater than the pressure value of the first type first main injection pressure P11; the first type second main injection oil amount m12 is larger than the first type first main injection oil amount m 11.

For example, when the fuel injector performs the second injection, the injection pressure of the second injection is increased, so that the first second main injection pressure P12 is approximately equal to 1.8 and the first main injection pressure P11, and meanwhile, for ensuring the power performance, the first main injection oil m11 is approximately equal to 1.5 and the first second main injection oil m 12.

S221, according to the second type operating point region, respectively determining a second type first main injection time t21, a second type first main injection pressure P21, a second type first main injection duration d21, a second type second main injection time t22, a second type second main injection pressure P22 and a second type second main injection duration d22 of the fuel injector in the second type operating point region.

The first main injection time is the time before the piston reaches the top dead center, and here, the second type of first main injection time is the time before the piston reaches the top dead center.

S222, controlling the fuel injector to inject the second type first main injection oil quantity m21 at the second type first main injection time t21, wherein the injection pressure is the second type first main injection pressure P21, and the second type first main injection duration d21 is continued.

S223, controlling the oil injector to inject a second secondary main oil injection quantity m22 at the second secondary main injection time t22, wherein the injection pressure is the second secondary main injection pressure P22, and the second secondary main injection duration d22 is continued.

When the in-cylinder temperature is lower than 1800K, the NOx generation rate is extremely low, and when the in-cylinder temperature reaches 2000K, the NOx generation rate reaches a very high rate, and it can be roughly considered that the NO generation rate is almost doubled every 100K increase in the in-cylinder temperature.

With reference to fig. 5-7, the operating point region of the diesel engine is a second operating point region, in this embodiment, the fuel injector uses two main injections to divide the fuel amount of the original one main injection into two main injections, and the fuel amount of the first main injection of the fuel injector is reduced, so that the peak value of the first injection temperature is reduced; the in-cylinder temperature of the injector has already begun to drop at the beginning of the second injection, so the in-cylinder combustion temperature of the second injection is not too high. During the first main injection process of the injector, the injector is injected with the rail pressure of the second type first main injection pressure P21, after ignition, the injector is subjected to second main injection at the second type second main injection time t22 with the pressure of the second type second main injection pressure P22, and the economy is ensured by adjusting the second main injection time t22 of the injector and increasing the pressure of the second type second main injection pressure P22.

Wherein the second type second main injection pressure P22 is a pressure value greater than the second type first main injection pressure P21; the second type of second main oil injection amount m22 is larger than the second type of first main oil injection amount m 21.

Exemplary, second class second main injection pressure P22 ≈ 1.3 second class first main injection pressure P21 and second class second main injection oil amount m22 ≈ 1.3 × second class first main injection oil amount m 21.

S231, respectively determining a third type first main injection time t31, a third type first main injection pressure P31, a third type first main injection duration d31, a third type second main injection time t32, a third type second main injection pressure P32 and a third type second main injection duration d32 of the fuel injector in the third type operating point region according to the third type operating point region.

The first main injection time is the time before the piston reaches the top dead center, and here, the third type of first main injection time is the time before the piston reaches the top dead center.

S232, controlling the fuel injector to inject fuel at the third type first main injection time t31, wherein the injection pressure is the third type first main injection pressure P31, and the third type first main injection duration d31 is continued to inject the third type first main injection quantity m 31.

S233, controlling the fuel injector to inject the third type second main injection oil quantity m32 at the third type second main injection time t32, wherein the injection pressure is the third type second main injection pressure P32, and the third type second main injection duration d32 is continued.

With reference to fig. 8, the operating point region where the diesel engine is located is a third type of operating point region, and on the premise of the primary main injection of the fuel injector, the rail pressure of the secondary main injection of the fuel injector is increased, so that the atomization effect is improved, the oil-gas mixing process is improved, and the smoke intensity is reduced. Meanwhile, by utilizing the entrainment effect of the second double main jet of the oil injector, the turbulence intensity in the cylinder is enhanced in the diffusion process of the free oil beam, the oil-gas mixing is promoted, and the turbulence energy in the cylinder is promoted, so that the carbon smoke reoxidation efficiency in the combustion process in the cylinder is promoted, and the aim of reducing the smoke intensity is fulfilled.

Wherein the second type second main injection pressure P32 is a pressure value greater than the second type first main injection pressure P31; the second type of second main oil injection amount m32 is larger than the second type of first main oil injection amount m 31.

Illustratively, to ensure the entrainment effect, the third type second main injection pressure P32 ≈ 1.5 ≈ the third type first main injection pressure P31, and the third type second main injection oil amount m32 ≈ 1.5 ≈ the third type first main injection oil amount m 31.

The double-main-jet process of the oil injector fully utilizes the space superposition strength of the entrainment effect of the high-speed oil beam of the two-time main jet in combination with the entrainment effect space superposition effect shown in the figure 9, the second main jet of the oil injector is added in the process of the first main jet of the oil injector, the secondary organization of the oil beam to the flow field in the cylinder is realized, the turbulence in the cylinder is strengthened to the maximum degree, the oil-gas mixing rate in the cylinder is improved, and the combustion speed in the middle and later stages of combustion and the utilization rate of the air in the cylinder are effectively improved.

And S241, respectively determining a fourth type first main injection time t41, a fourth type first main injection pressure P41 and a fourth type first main injection duration d41 of the fuel injector in the fourth type operating point region according to the fourth type operating point region.

Where the first main injection timing is a timing before the piston reaches tdc, then here, the fourth type of first main injection timing is a timing before the piston reaches tdc.

And S242, controlling the fuel injector to inject a fourth type first main injection oil quantity m41 at the fourth type first main injection time t41, wherein the injection pressure is the fourth type first main injection pressure P41, and the fourth type first main injection duration d41 is continued.

Referring to fig. 10, the operating point area where the diesel engine is located is a fourth type of operating point area, and a primary main injection mode is adopted, that is, at the first primary main injection time of the fourth type, fuel oil is injected into the cylinder near the top dead center, so that the best fuel economy is obtained.

With continued reference to fig. 4, 5, 8 and 10, on the basis of the above-described embodiment, the injector is controlled to perform the first pilot injection operation and the second pilot injection operation before the injector injection control operation corresponding to the operating point region is performed.

According to the technical scheme of the embodiment of the invention, aiming at a high-speed high-load working condition area, the combustion speed in the middle and later periods is accelerated, and the exhaust temperature is reduced; aiming at the high-speed low-load working point, the reduction of soot is promoted by the entrainment effect of the double main jets and the entrainment effect of the second main jet; aiming at a low-speed high-load working condition point, the highest temperature is controlled by reducing the primary main oil injection amount, and the generation of NOx is reduced. The temperature in the cylinder is adjusted by controlling the injection rail pressure and the injection duration of the double main sprays of the oil injector, so that the control of the highest temperature and the temperature change is realized, meanwhile, the injection pressure of the double main sprays of the oil injector is controlled, the mixing and atomizing level is enhanced, the NOx emission is controlled, and the smoke intensity is reduced.

EXAMPLE III

Fig. 11 is a schematic structural diagram of a control device of an injector according to a third embodiment of the present invention. As shown in fig. 11, the control device of the injector includes:

The control device of the fuel injector of the embodiment of the invention determines the working point area of the diesel engine through the external characteristic curve and the universal characteristic curve of the diesel engine, and respectively executes fuel injection control operation of the fuel injector corresponding to the working point area based on the first main injection time, the first main injection pressure, the first main injection duration, the second main injection time, the second main injection pressure and the second main injection duration of the fuel injector. The problem that the reliability and the emission performance of the diesel engine are difficult to coordinate on the premise of meeting the economical efficiency due to the fact that one-time main injection is mainly carried out in an oil injection strategy in the existing diesel engine is solved, the injection strategies of double main injections of the oil injector are respectively controlled according to the working condition point area of the actual operation of the diesel engine, the exhaust temperature is improved in a targeted mode, the emission is reduced, and the power, the economical efficiency and the reliability are mutually coordinated.

respectively determining first-type first main injection time, first-type first main injection pressure, first-type first main injection duration, first-type second main injection time, first-type second main injection pressure and first-type second main injection duration of the oil injector in the first-type working point region according to the first-type working point region;

an injection control module comprising:

controlling the oil injector to inject a first type of first main injection oil mass at the first type of first main injection time, wherein the injection pressure is the first type of first main injection pressure, and the first type of first main injection oil mass is injected for the first type of first main injection duration;

Optionally, a pressure value of the first type second main injection pressure is greater than a pressure value of the first type first main injection pressure;

an injection control module comprising:

controlling the oil injector to inject a third type of first main injection oil mass at the third type of first main injection time, wherein the injection pressure is the third type of first main injection pressure, and the third type of first main injection oil mass is injected for the third type of first main injection duration;

Optionally, the operating point region is a fourth operating point region;

the oil injection control module is specifically used for:

and controlling the oil injector to inject the fourth type first main injection oil quantity at the fourth type first main injection time, wherein the injection pressure is the fourth type first main injection pressure, and the fourth type first main injection oil quantity is injected continuously for the fourth type first main injection duration.

Optionally, the first main injection time is a time before the piston reaches the top dead center.

Optionally, the control device of the fuel injector further includes:

and the pilot injection operation module is used for controlling the oil injector to execute a first pilot injection operation and a second pilot injection operation before executing the oil injector oil injection control operation corresponding to the operating point region.

The control device of the fuel injector provided by the embodiment of the invention can execute the control method of the fuel injector provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution of the control method of the fuel injector.

Example four

FIG. 12 shows a schematic block diagram of a diesel engine that can be used to implement embodiments of the present invention. As shown in fig. 12, the diesel engine includes at least one processor, and a memory communicatively connected to the at least one processor, such as a Read Only Memory (ROM), a Random Access Memory (RAM), and the like, wherein the memory stores a computer program executable by the at least one processor, and the processor can perform various suitable actions and processes according to the computer program stored in the Read Only Memory (ROM) or the computer program loaded from a storage unit into the Random Access Memory (RAM). In the RAM, various programs and data required for the operation of the diesel engine can also be stored. The processor, the ROM, and the RAM are connected to each other through a bus. An input/output (I/O) interface is also connected to the bus.

A plurality of components in the diesel engine are connected to the I/O interface, including: an input unit such as a keyboard, a mouse, etc.; an output unit such as various types of displays, speakers, and the like; storage units such as magnetic disks, optical disks, and the like; and a communication unit such as a network card, modem, wireless communication transceiver, etc. The communication unit allows the diesel engine to exchange information/data with other devices via a computer network such as the internet and/or various telecommunication networks.

The processor may be a variety of general and/or special purpose processing components with processing and computing capabilities. Some examples of processors include, but are not limited to, Central Processing Units (CPUs), Graphics Processing Units (GPUs), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, Digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, or the like. The processor performs the various methods and processes described above, such as a method of controlling a fuel injector.

In some embodiments, the fuel injector control method may be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as a memory unit. In some embodiments, part or all of the computer program may be loaded and/or installed on the diesel engine via the ROM and/or the communication unit. When the computer program is loaded into RAM and executed by a processor, one or more steps of the fuel injector control method described above may be performed. Alternatively, in other embodiments, the processor may be configured to perform the fuel injector control method by any other suitable means (e.g., by way of firmware).

Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, Field Programmable Gate Arrays (FPGAs), Application Specific Integrated Circuits (ASICs), Application Specific Standard Products (ASSPs), system on a chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, receiving data and instructions from, and transmitting data and instructions to, a storage system, at least one input device, and at least one output device.

A computer program for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be performed. A computer program can execute entirely on a machine, partly on a machine, as a stand-alone software package partly on a machine and partly on a remote machine or entirely on a remote machine or server.

In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

To provide for interaction with a user, the systems and techniques described herein may be implemented on a diesel engine having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which a user may provide input to the diesel engine. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic, speech, or tactile input.

The systems and techniques described here can be implemented in a computing system that includes a back-end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back-end, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), Wide Area Networks (WANs), blockchain networks, and the internet.

The computing system may include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical host and VPS service are overcome.

It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.

The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. 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 present invention.

Claims

1. A control method of a fuel injector, characterized by comprising:

acquiring an external characteristic curve and a universal characteristic curve of a diesel engine, and determining a working condition point region where the diesel engine is located according to the external characteristic curve and the universal characteristic curve, wherein the working condition point region comprises a first type working condition point region, a second type working condition point region, a third type working condition point region and a fourth type working condition point region, the first type working condition point region comprises a high-speed high-load working condition point with the exhaust temperature of more than 500 ℃ and the excess air coefficient of more than 1500rpm aiming at the diesel engine, the second type working condition point region comprises a low-speed high-load working condition point with the exhaust temperature of less than 500 ℃ and the excess air coefficient of less than 1.3 aiming at the diesel engine, the third type working condition point region comprises a high-speed low-load working condition point with the exhaust temperature of more than 1500rpm aiming at the diesel engine, and the fourth type working condition point region comprises a normal starting working condition point;

controlling the oil injector to inject a first type of second main injection oil quantity at the first type of second main injection time, wherein the injection pressure is the first type of second main injection pressure, and the first type of second main injection oil quantity is injected continuously for the first type of second main injection duration; wherein the pressure value of the first type second main injection pressure is greater than the pressure value of the first type first main injection pressure; the first type second main injection oil amount is larger than the first type first main injection oil amount; or the like, or, alternatively,

controlling the oil injector to inject a second secondary main oil injection quantity at the second secondary main injection time, wherein the injection pressure is the second secondary main injection pressure, and the second secondary main injection quantity is injected for the second secondary main injection duration; wherein the pressure value of the second type second main injection pressure is greater than the pressure value of the second type first main injection pressure; the second type of second main oil injection amount is greater than the second type of first main oil injection amount; or the like, or, alternatively,

controlling the oil injector to inject a third type of second main injection oil mass at the third type of second main injection time, wherein the injection pressure is the third type of second main injection pressure, and the third type of second main injection oil mass is injected continuously for the third type of second main injection duration; wherein the pressure value of the third type second main injection pressure is greater than the pressure value of the third type first main injection pressure; the third type of second main oil injection amount is greater than the third type of first main oil injection amount; or the like, or, alternatively,

respectively determining a fourth type first main injection time, a fourth type first main injection pressure and a fourth type first main injection duration of the oil injector in the fourth type operating point area according to the fourth type operating point area;

2. A control apparatus of a fuel injector, characterized by comprising:

a working point area determination module for acquiring an external characteristic curve and a universal characteristic curve of the diesel engine, and determining the working point area of the diesel engine according to the external characteristic curve and the universal characteristic curve, the operating point areas comprise a first type operating point area, a second type operating point area, a third type operating point area and a fourth type operating point area, the first type of operating point region comprises high-speed high-load operating points with the diesel engine rotating speed of more than 1500rpm and the exhaust temperature of more than 500 ℃, the second class of operating point region includes low speed high load operating points for excess air ratios less than 1.3 and diesel engine speeds below 1200rpm, the third type of working condition point region comprises a high-speed low-load working condition point aiming at the condition that the rotating speed of the diesel engine is more than 1500rpm and the exhaust temperature is lower than 500 ℃, and the fourth type of working condition point region comprises a normal starting working condition point;

the fuel injector information determining module is specifically used for respectively determining a first type of first main injection time, a first type of first main injection pressure, a first type of first main injection duration, a first type of second main injection time, a first type of second main injection pressure and a first type of second main injection duration of the fuel injector in the first type of operating point region according to the first type of operating point region;

the fuel injection control module is specifically used for controlling the fuel injector to inject a first type of first main fuel injection quantity at the first type of first main injection time, wherein the injection pressure is the first type of first main injection pressure, and the first type of first main fuel injection quantity is injected continuously for the first type of first main injection duration;

controlling the oil injector to inject a first type of second main injection oil quantity at the first type of second main injection time, wherein the injection pressure is the first type of second main injection pressure, and the first type of second main injection oil quantity is injected continuously for the first type of second main injection duration; wherein the pressure value of the first type second main injection pressure is greater than the pressure value of the first type first main injection pressure; the first type second main fuel injection amount is larger than the first type first main fuel injection amount; or the like, or, alternatively,

the fuel injector information determining module is specifically configured to respectively determine a second type first main injection time, a second type first main injection pressure, a second type first main injection duration, a second type second main injection time, a second type second main injection pressure and a second type second main injection duration of the fuel injector in the second type operating point region according to the second type operating point region;

the fuel injection control module is specifically used for controlling the fuel injector to inject a second type of first main fuel injection quantity at the second type of first main fuel injection time at the injection pressure of the second type of first main fuel injection, and the second type of first main fuel injection quantity is injected continuously for the second type of first main fuel injection duration;

controlling the oil injector to inject a second secondary main oil injection quantity at the second secondary main injection time, wherein the injection pressure is the second secondary main injection pressure, and the second secondary main injection quantity is injected for the second secondary main injection duration; wherein the pressure value of the second-type second main injection pressure is greater than the pressure value of the second-type first main injection pressure; the second type of second main oil injection amount is greater than the second type of first main oil injection amount; or the like, or, alternatively,

the fuel injector information determining module is specifically configured to respectively determine a third type first main injection time, a third type first main injection pressure, a third type first main injection duration, a third type second main injection time, a third type second main injection pressure and a third type second main injection duration of the fuel injector in the third type operating point region according to the third type operating point region;

the fuel injection control module is specifically used for controlling the fuel injector to inject a third type of first main fuel injection quantity at the third type of first main fuel injection time at the injection pressure which is the third type of first main fuel injection pressure and lasts for the third type of first main fuel injection duration;

controlling the oil injector to inject a third type of second main injection oil mass at the third type of second main injection time, wherein the injection pressure is the third type of second main injection pressure, and the third type of second main injection oil mass is injected continuously for the third type of second main injection duration; wherein the pressure value of the third type second main injection pressure is greater than the pressure value of the third type first main injection pressure; the third type of second main oil injection amount is greater than the third type of first main oil injection amount; or the like, or a combination thereof,

the fuel injector information determining module is specifically configured to respectively determine a fourth type first main injection time, a fourth type first main injection pressure and a fourth type first main injection duration of the fuel injector in the fourth type operating point region according to the fourth type operating point region;

and the fuel injection control module is specifically used for controlling the fuel injector to inject the fourth type of first main fuel injection at the fourth type of first main fuel injection time at the injection pressure which is the fourth type of first main fuel injection pressure for the duration of the fourth type of first main fuel injection.

3. A diesel engine, characterized in that it comprises:

at least one processor; and

the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the fuel injector control method of claim 1.

4. A computer readable storage medium characterized by storing computer instructions for causing a processor to execute a method of controlling a fuel injector according to claim 1.