CN116398311A - Multi-strategy fuel injection method, device, equipment and automobile - Google Patents
Multi-strategy fuel injection method, device, equipment and automobile Download PDFInfo
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- 238000002347 injection Methods 0.000 title claims abstract description 467
- 239000007924 injection Substances 0.000 title claims abstract description 467
- 239000000446 fuel Substances 0.000 title claims abstract description 237
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000010586 diagram Methods 0.000 claims description 25
- 238000002485 combustion reaction Methods 0.000 claims description 13
- 238000004088 simulation Methods 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0614—Actual fuel mass or fuel injection amount
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The application discloses a multi-strategy fuel injection method, a device, equipment and an automobile, wherein the method comprises the steps of detecting the current working condition of an engine when fuel needs to be injected into a cylinder of the engine; if the current working condition is a low-speed low-load working condition or a high-speed working condition, determining a first injection quantity; performing a first main fuel injection according to the first injection amount; the first main fuel injection is non-vortex cavitation injection; if the current working condition is a low-speed high-load working condition, determining a second injection quantity; performing a second main fuel injection according to the second injection amount; the second main fuel injection is vortex line cavitation injection; if the current working condition is a common working condition, determining a third injection quantity and a fourth injection quantity; performing a third main fuel injection according to the third injection amount; the third main fuel injection is vortex line cavitation injection; performing a fourth main fuel injection according to a fourth injection amount; the fourth main fuel injection is a non-vortex cavitation injection. According to the scheme, different fuel injection strategies are applied according to the working condition of the engine, so that the air utilization is maximized.
Description
Technical Field
The application belongs to the technical field of fuel injection, and particularly relates to a multi-strategy fuel injection method, a device, equipment and an automobile.
Background
When fuel is injected into an engine cylinder, the existing part of vehicles apply a double main injection technology, namely, the fuel to be injected is divided into two injections. The double main spraying technology can enhance the entrainment effect of the middle section of the oil beam and improve the oil-gas mixing efficiency.
However, in the existing double main injection technology, the interaction between the two injected fuels is less, so that the improvement effect on the oil-gas mixing efficiency is not obvious.
Disclosure of Invention
Therefore, the application provides a multi-strategy fuel injection method, a multi-strategy fuel injection device, multi-strategy fuel injection equipment and an automobile, so that the utilization rate of air in a cylinder is improved.
A first aspect of the present application provides a multi-strategy fuel injection method comprising:
when fuel needs to be injected into a cylinder of an engine, detecting the current working condition of the engine;
if the current working condition is a low-speed low-load working condition or a high-speed working condition, determining a first injection quantity;
controlling a fuel injector to perform first main fuel injection to the cylinder according to the first injection quantity; wherein the first main fuel injection is a non-vortex cavitation injection;
if the current working condition is a low-speed high-load working condition, determining a second injection quantity;
controlling the fuel injector to perform second main fuel injection to the cylinder according to the second injection quantity; wherein the second main fuel injection is a vortex line cavitation injection;
if the current working condition is a common working condition, determining a third injection quantity and a fourth injection quantity;
controlling the fuel injector to perform third main fuel injection to the cylinder according to the third injection quantity; wherein the third main fuel injection is a vortex line cavitation injection;
controlling the fuel injector to perform a fourth main fuel injection to the cylinder according to the fourth injection quantity; wherein the fourth main fuel injection is a non-vortex cavitation injection.
Optionally, the detecting the current working condition of the engine includes:
detecting the current rail pressure and the current oil injection quantity of the engine;
determining the current working condition of the engine according to the current rail pressure, the current fuel injection quantity and a preset working condition diagram; the working condition diagram represents the corresponding relation of rail pressure, fuel injection quantity and working conditions.
Optionally, the process of obtaining the working condition map includes:
performing three-dimensional combustion simulation on an oil supply system, a fuel injector and a combustion chamber of the engine to obtain injection parameters of fuel injection according to a double main injection mode under different rail pressures and injection quantities of the engine; the injection parameters comprise an excess air coefficient, the injection oil mass momentum of two main fuel injections and the overlapping area ratio of the two main fuel injections;
and determining the working condition map according to the injection parameters.
Optionally, the determining the third injection amount and the fourth injection amount includes:
determining a total injection quantity according to a state parameter of the engine;
and determining a third injection quantity and a fourth injection quantity according to the total injection quantity and the preset injection quantity proportion.
A second aspect of the present application provides a multi-strategy fuel injection apparatus comprising:
the detection unit is used for detecting the current working condition of the engine when fuel needs to be injected into the cylinder of the engine;
the determining unit is used for determining a first injection quantity if the current working condition is a low-speed low-load working condition or a high-speed working condition;
a control unit configured to control a fuel injector to perform first main fuel injection to the cylinder according to the first injection amount; wherein the first main fuel injection is a non-vortex cavitation injection;
the determining unit is used for determining a second injection quantity if the current working condition is a low-speed high-load working condition;
the control unit is used for controlling the fuel injector to perform second main fuel injection to the cylinder according to the second injection quantity; wherein the second main fuel injection is a vortex line cavitation injection;
the determining unit is used for determining a third injection quantity and a fourth injection quantity if the current working condition is a common working condition;
the control unit is used for:
controlling the fuel injector to perform third main fuel injection to the cylinder according to the third injection quantity; wherein the third main fuel injection is a vortex line cavitation injection;
controlling the fuel injector to perform a fourth main fuel injection to the cylinder according to the fourth injection quantity; wherein the fourth main fuel injection is a non-vortex cavitation injection.
Optionally, when the detecting unit detects the current working condition of the engine, the detecting unit is specifically configured to:
detecting the current rail pressure and the current oil injection quantity of the engine;
determining the current working condition of the engine according to the current rail pressure, the current fuel injection quantity and a preset working condition diagram; the working condition diagram represents the corresponding relation of rail pressure, fuel injection quantity and working conditions.
Optionally, the device further includes an obtaining unit, configured to obtain the working condition map, specifically configured to:
performing three-dimensional combustion simulation on an oil supply system, a fuel injector and a combustion chamber of the engine to obtain injection parameters of fuel injection according to a double main injection mode under different rail pressures and injection quantities of the engine; the injection parameters comprise an excess air coefficient, the injection oil mass momentum of two main fuel injections and the overlapping area ratio of the two main fuel injections;
and determining the working condition map according to the injection parameters.
Optionally, when the determining unit determines the third injection amount and the fourth injection amount, the determining unit is specifically configured to:
determining a total injection quantity according to a state parameter of the engine;
and determining a third injection quantity and a fourth injection quantity according to the total injection quantity and the preset injection quantity proportion.
A third aspect of the present application provides an electronic device comprising a memory and a processor;
the memory is used for storing a computer program;
the processor is configured to execute the computer program, and in particular, to implement the multi-strategy fuel injection method provided in any one of the first aspects of the present application.
A fourth aspect of the present application provides an automobile comprising an electronic control unit and an engine;
the electronic control unit is used for:
at the start of the engine, the multi-strategy fuel injection method according to any one of the first aspect of the present application controls a fuel injector of the engine to inject fuel into a cylinder of the engine.
The application discloses a multi-strategy fuel injection method, a device, equipment and an automobile, wherein the method comprises the steps of detecting the current working condition of an engine when fuel needs to be injected into a cylinder of the engine; if the current working condition is a low-speed low-load working condition or a high-speed working condition, determining a first injection quantity; controlling the fuel injector to perform first main fuel injection to the cylinder according to the first injection quantity; wherein the first main fuel injection is a non-vortex cavitation injection; if the current working condition is a low-speed high-load working condition, determining a second injection quantity; controlling the fuel injector to perform second main fuel injection to the cylinder according to the second injection quantity; wherein the second main fuel injection is a vortex line cavitation injection; if the current working condition is a common working condition, determining a third injection quantity and a fourth injection quantity; controlling the fuel injector to perform third main fuel injection to the cylinder according to the third injection quantity; wherein the third main fuel injection is vortex line cavitation injection; controlling the fuel injector to perform a fourth main fuel injection into the cylinder according to the fourth injection quantity; wherein the fourth main fuel injection is a non-vortex cavitation injection. The beneficial effect of this scheme lies in, according to the operating mode application different fuel injection strategies of engine to realize the air utilization maximize.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings may be obtained according to the provided drawings without inventive effort to a person skilled in the art.
FIG. 1 is a flow chart of a multi-strategy fuel injection method provided by an embodiment of the present application;
FIG. 2 is an example of a working condition map provided by an embodiment of the present application;
FIG. 3 is a schematic diagram of a multi-strategy fuel injection apparatus according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
As described in the background art, in order to improve the oil-gas mixing efficiency, some engines currently use a dual main injection method to inject fuel, but the improvement effect of the method on the oil-gas mixing efficiency is not significant.
Therefore, the part of engines further changes the first main fuel injection in the double main injection from the conventional injection mode into vortex line cavitation injection, so that fuel droplets after the first injection can collide with fuel droplets after the second injection for crushing, and the oil-gas mixing efficiency is further improved.
However, under different working conditions, the rail pressure and the fuel injection quantity of the engine are different, the rail pressure and the fuel injection quantity influence the injection speed of fuel, and under a high-speed working condition (namely a high-speed working condition), the potential difference between two main fuel injections can also cause the overlap ratio of the injection areas of the two main fuel injections to be smaller, and the fuel droplets injected by the two main fuel injections cannot collide fully.
Based on the influence of the factors, the primary injection is a double main injection strategy of vortex cavitation injection, the injection strategy cannot be suitable for all working conditions of an engine, and the injection strategy cannot improve the oil-gas mixing efficiency under part of working conditions, but can influence the utilization rate of air in a cylinder.
In view of the above problems, the present application provides a multi-strategy fuel injection method, so as to select an appropriate injection strategy to perform main fuel injection according to different working conditions of an engine, so as to maximize air utilization in a cylinder.
Referring to fig. 1, which is a flowchart of the method, the method may include the following steps.
S101, when fuel needs to be injected into a cylinder of the engine, detecting the current working condition of the engine.
If the current working condition of the engine is a low-speed low-load working condition or a high-speed working condition, the step S102 is executed, if the current working condition of the engine is a low-speed high-load working condition, the step S104 is executed, and if the current working condition of the engine is a common working condition, the step S106 is executed.
Optionally, detecting the current working condition of the engine includes:
detecting the current rail pressure and the current oil injection quantity of an engine;
determining the current working condition of the engine according to the current rail pressure, the current fuel injection quantity and a preset working condition diagram; the working condition diagram represents the corresponding relation among rail pressure, fuel injection quantity and working condition.
The reason for determining the current operating condition based on the rail pressure and the injection quantity is that the speed and the duration of the fuel injected by the fuel injector are determined by the rail pressure and the injection quantity of the engine, so that different operating conditions of the engine can be distinguished based on the rail pressure and the injection quantity.
The working condition diagrams are also different for different engines according to different structures, and the embodiment does not limit the specific working condition diagrams.
As one example, the operating map used in S101 may be the operating map shown in fig. 2.
As can be seen from fig. 2, the engine operating mode can be divided into regions 1 to 4 according to the rail pressure and the injection quantity, wherein region 1 corresponds to a low-speed low-load operating mode, region 2 corresponds to a low-speed high-load operating mode, region 3 corresponds to a normal operating mode, and region 4 corresponds to a high-speed operating mode.
Based on the divided areas in the working condition diagram, when executing S101, the current rail pressure and the current oil injection quantity of the engine can be detected through the sensor, then the corresponding coordinate points of the current rail pressure and the current oil injection quantity in the working condition diagram are determined, and finally the current working condition of the engine is determined according to the area where the coordinate points are located.
Taking fig. 2 as an example, if the coordinate points corresponding to the current rail pressure and the current fuel injection quantity in the working condition diagram are located in the area 1, determining that the current working condition of the engine is a low-speed low-load working condition; if the engine is in the region 2, determining the current working condition of the engine as a low-speed high-load working condition; if the engine is located in the area 3, determining the current working condition of the engine as a common working condition; if the engine is in the area 4, the current working condition of the engine is determined to be a high-speed working condition.
The working condition diagram of the engine of a specific model can be obtained in a plurality of modes, and one alternative mode is that the injection parameters of the engine of the specific model for injecting fuel in a double main injection mode under different rail pressures and injection quantities are obtained by collecting data of the engine of the specific model in the actual use process and the test process, and then the working condition diagram is determined according to the injection parameters under the different rail pressures and injection quantities.
Another alternative is:
performing three-dimensional combustion simulation on an oil supply system, a fuel injector and a combustion chamber of the engine to obtain injection parameters of fuel injection according to a double main injection mode under different rail pressures and injection quantities of the engine; the injection parameters comprise excess air coefficient, the injection oil quantity momentum of two main fuel injections and the overlapping area ratio of the two main fuel injections;
and determining a working condition diagram according to the injection parameters.
Taking the second way as an example, for a specific type of engine, structural parameters of structures such as an oil supply system, an oil injector, a combustion chamber and the like of the type of engine can be obtained first, and a corresponding three-dimensional structural model is constructed according to the structural parameters.
Then, double main injection simulation is carried out on the three-dimensional structure model under different rail pressures and injection quantities, namely, the situation of injecting fuel in the three-dimensional structure model according to the double main injection mode under different rail pressures and injection quantities is simulated in a numerical operation mode, so that injection parameters of injecting fuel in the double main injection mode under different rail pressures and injection quantities are obtained.
Finally, according to injection parameters corresponding to different rail pressures and injection quantities, it can be determined which working condition (or which region of the working condition map) the different rail pressure-injection quantity combinations should belong to, so as to determine the working condition map shown in fig. 2.
For example, at a specific rail pressure P0, the injection oil amount momentum and the excess air ratio are different depending on the injection oil amount, and at this time, if the injection oil amount momentum P2 of the second main injection (main fuel injection) is smaller than or equal to 1.1 times the injection oil amount momentum P1 of the first main injection, it is appropriate to inject the fuel in a single main injection, and thus the rail pressure-injection oil amount combination satisfying the condition that P2 is smaller than or equal to 1.1 times P1 is divided into the region 1 or 2.
Further, if the excess air ratio is less than a certain threshold value (for example, less than 1.3) while satisfying the condition that p2 is less than or equal to 1.1 times p1, then vortex line cavitation injection is suitably employed, whereupon the rail pressure-injection amount combination satisfying the condition that p2 is less than or equal to 1.1 times p1 and satisfying the condition that the excess air ratio is less than 1.3 is divided into the region 2, and the rail pressure-injection amount combination satisfying the condition that p2 is less than or equal to 1.1 times p1 and satisfying the condition that the excess air ratio is not less than 1.3 is divided into the region 1.
If the injection oil amount momentum p2 of the second main injection (main fuel injection) is greater than the injection oil amount momentum p1 of the first main injection by 1.1 times, the rail pressure-injection oil amount combination satisfying this condition is divided into the region 3 or 4, at which time it may be decided whether to divide into the region 3 or 4 according to the overlapping region duty ratio of the two main fuel injections. Specifically, if the overlapping portion of the first primary spraying area and the second primary spraying area is greater than or equal to 70%, the first primary spraying area and the second primary spraying area are divided into an area 3, namely a common working condition, and if the overlapping portion of the first primary spraying area and the second primary spraying area is less than 70%, the first primary spraying area and the second primary spraying area are divided into an area 4, namely a high-speed working condition.
It will be appreciated that the threshold value of the overlap may be modified to other values, not limited to 70%, depending on the actual situation.
S102, determining a first injection quantity.
The first injection amount may be determined according to the load of the engine, and in general, the higher the load of the engine, the larger the first injection amount.
S103, controlling the fuel injector to perform first main fuel injection to the cylinder according to the first injection quantity, wherein the first main fuel injection is non-vortex line cavitation injection.
When the current working condition belongs to the low-speed low-load working condition, the rail pressure is lower, the oil beam momentum is small, the superposition entrainment effect of the two injections of the double main injections is weaker, and compared with the single main injection, the advantage is not obvious, so that only the single main injection can be considered.
When the current working condition belongs to the high-speed working condition, the duration of fuel injection is short, the piston moves fast, if double main injection is adopted, the difference of the drop points of the fuel injected twice on the piston is larger, the overlapping area of two oil beams is small, the advantages of double main injection cannot be reflected, and therefore single main injection is adopted.
S104, determining a second injection quantity.
When the current working condition belongs to the low-speed high-load working condition, the rail pressure of the engine is lower, the oil beam speed is not high, but the oil injection quantity is increased, meanwhile, the excessive air coefficient is low, and the air utilization rate is urgently required to be improved.
Therefore, when the current working condition belongs to the low-speed high-load working condition, the fuel injection can be directly carried out in a single vortex cavitation injection mode.
The second injection amount may be determined based on a current load of the engine.
S105, controlling the fuel injector to perform second main fuel injection to the cylinder according to the second injection quantity, wherein the second main fuel injection is vortex line cavitation injection.
S106, determining a third injection quantity and a fourth injection quantity.
When the current working condition belongs to the common working condition, fuel injection can be carried out according to a double main injection mode, the first main fuel injection is vortex line cavitation injection, and the second main fuel injection is non-vortex line cavitation injection.
The fuel injection method has the advantages that the fuel injection is carried out in the mode under the common working condition, the injection angle of the primary main injection is large, the flow is low, the distribution range is wide, the secondary main injection speed is high, the flow is high, the momentum is large, the oil beam of the secondary main injection penetrates through the primary injection and realizes secondary collision of two oil beams after the oil beam collides with the wall, and the oil-gas mixing efficiency is greatly improved.
In the present embodiment, the third injection amount and the fourth injection amount may be determined in various ways. An alternative way is:
determining a total injection amount according to a state parameter of the engine;
and determining a third injection quantity and a fourth injection quantity according to the total injection quantity and the preset injection quantity proportion.
The state parameter of the engine may specifically be the current load of the engine.
The injection quantity ratio can be set according to the actual conditions such as the engine structure, the working condition of the vehicle and the like, and is not limited.
For example, the injection amount ratio may be set to 1:1, and at this time, the third injection amount may be equal to the fourth injection amount, which are both 50% of the total injection amount.
Another alternative is:
firstly, determining the total injection quantity according to the state parameters of an engine;
then, the preset third injection amount is subtracted from the total injection amount to obtain a fourth injection amount.
That is, in the second mode, the third injection amount at the time of cavitation injection of the vortex line may be a fixed value, so that when the third injection amount and the fourth injection amount are determined, only the total injection amount is determined first, and then the insufficient portion of the total injection amount minus the third injection amount is divided into the fourth injection amount.
It is to be understood that the fourth injection amount may be set to a fixed value, and the fourth injection amount may be subtracted from the total injection amount determined according to the load, and the deficient portion may be the third injection amount of the cavitation injection of the vortex line.
And S107, controlling the fuel injector to perform third main fuel injection to the cylinder according to the third injection quantity, wherein the third main fuel injection is vortex line cavitation injection.
The third main fuel injection is the first main fuel injection in the dual main injection.
S108, controlling the fuel injector to perform fourth main fuel injection to the cylinder according to the fourth injection quantity, wherein the fourth main fuel injection is non-vortex line cavitation injection.
The fourth main fuel injection is the second main fuel injection in the dual main injection.
The application discloses a multi-strategy fuel injection method, which comprises the steps of detecting the current working condition of an engine when fuel needs to be injected into a cylinder of the engine; if the current working condition is a low-speed low-load working condition or a high-speed working condition, determining a first injection quantity; controlling the fuel injector to perform first main fuel injection to the cylinder according to the first injection quantity; wherein the first main fuel injection is a non-vortex cavitation injection; if the current working condition is a low-speed high-load working condition, determining a second injection quantity; controlling the fuel injector to perform second main fuel injection to the cylinder according to the second injection quantity; wherein the second main fuel injection is a vortex line cavitation injection; if the current working condition is a common working condition, determining a third injection quantity and a fourth injection quantity; controlling the fuel injector to perform third main fuel injection to the cylinder according to the third injection quantity; wherein the third main fuel injection is vortex line cavitation injection; controlling the fuel injector to perform a fourth main fuel injection into the cylinder according to the fourth injection quantity; wherein the fourth main fuel injection is a non-vortex cavitation injection. The beneficial effect of this scheme lies in, according to the operating mode application different fuel injection strategies of engine to realize the air utilization maximize.
According to the multi-strategy fuel injection method provided in the embodiment of the present application, the embodiment of the present application further provides a multi-strategy fuel injection device, please refer to fig. 3, which is a schematic structural diagram of the device, and the device may include the following units.
A detection unit 301, configured to detect a current working condition of an engine when fuel needs to be injected into a cylinder of the engine;
a determining unit 302, configured to determine a first injection amount if the current working condition is a low-speed low-load working condition or a high-speed working condition;
a control unit 303 for controlling the fuel injector to perform a first main fuel injection to the cylinder according to the first injection amount; wherein the first main fuel injection is a non-vortex cavitation injection;
a determining unit 302, configured to determine a second injection amount if the current working condition is a low-speed high-load working condition;
a control unit 303 for controlling the fuel injector to perform second main fuel injection to the cylinder according to the second injection amount; wherein the second main fuel injection is a vortex line cavitation injection;
a determining unit 302, configured to determine a third injection amount and a fourth injection amount if the current working condition is a common working condition;
a control unit 303 for:
controlling the fuel injector to perform third main fuel injection to the cylinder according to the third injection quantity; wherein the third main fuel injection is vortex line cavitation injection;
controlling the fuel injector to perform a fourth main fuel injection into the cylinder according to the fourth injection quantity; wherein the fourth main fuel injection is a non-vortex cavitation injection.
Optionally, when the detecting unit 301 detects the current working condition of the engine, the detecting unit is specifically configured to:
detecting the current rail pressure and the current oil injection quantity of an engine;
determining the current working condition of the engine according to the current rail pressure, the current fuel injection quantity and a preset working condition diagram; the working condition diagram represents the corresponding relation among rail pressure, fuel injection quantity and working condition.
Optionally, the apparatus further includes an obtaining unit 304, configured to obtain a working condition map, specifically configured to:
performing three-dimensional combustion simulation on an oil supply system, a fuel injector and a combustion chamber of the engine to obtain injection parameters of fuel injection according to a double main injection mode under different rail pressures and injection quantities of the engine; the injection parameters comprise excess air coefficient, the injection oil quantity momentum of two main fuel injections and the overlapping area ratio of the two main fuel injections;
and determining a working condition diagram according to the injection parameters.
Optionally, when the determining unit 302 determines the third injection amount and the fourth injection amount, it is specifically configured to:
determining a total injection amount according to a state parameter of the engine;
and determining a third injection quantity and a fourth injection quantity according to the total injection quantity and the preset injection quantity proportion.
The specific working principle of the multi-strategy fuel injection device provided in this embodiment may refer to relevant steps of a multi-strategy fuel injection method provided in this embodiment, which is not described herein.
The application discloses a multi-strategy fuel injection device, comprising a detection unit 301, a control unit and a control unit, wherein the detection unit 301 is used for detecting the current working condition of an engine when fuel needs to be injected into a cylinder of the engine; the determining unit 302 is configured to determine the first injection amount if the current working condition is a low-speed low-load working condition or a high-speed working condition; the control unit 303 is configured to control the fuel injector to perform a first main fuel injection to the cylinder according to the first injection amount; wherein the first main fuel injection is a non-vortex cavitation injection; the determining unit 302 is configured to determine the second injection amount if the current working condition is a low-speed high-load working condition; the control unit 303 is configured to control the fuel injector to perform second main fuel injection to the cylinder according to the second injection amount; wherein the second main fuel injection is a vortex line cavitation injection; the determining unit 302 is configured to determine the third injection amount and the fourth injection amount if the current working condition is a common working condition; the control unit 303 is configured to control the fuel injector to perform third main fuel injection to the cylinder according to the third injection amount; wherein the third main fuel injection is vortex line cavitation injection; controlling the fuel injector to perform a fourth main fuel injection into the cylinder according to the fourth injection quantity; wherein the fourth main fuel injection is a non-vortex cavitation injection. The beneficial effect of this scheme lies in, according to the operating mode application different fuel injection strategies of engine to realize the air utilization maximize.
An embodiment of the present application further provides an electronic device, please refer to fig. 4, which is a schematic structural diagram of the electronic device, and the electronic device may include a memory 401 and a processor 402.
The memory 401 is for storing a computer program;
the processor 402 is configured to execute a computer program, specifically configured to implement the multi-strategy fuel injection method provided in any of the embodiments of the present application.
The embodiment of the application also provides an automobile, which comprises an electronic control unit and an engine;
the electronic control unit is used for:
when the engine is started, the fuel injector of the engine is controlled to inject fuel into the cylinder of the engine according to the multi-strategy fuel injection method provided by any embodiment of the application.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
For convenience of description, the above system or apparatus is described as being functionally divided into various modules or units, respectively. Of course, the functions of each element may be implemented in one or more software and/or hardware elements when implemented in the present application.
From the above description of embodiments, it will be apparent to those skilled in the art that the present application may be implemented in software plus a necessary general purpose hardware platform. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in an automobile, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the method described in the embodiments or some parts of the embodiments of the present application.
Finally, it is further noted that relational terms such as first, second, third, fourth, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application and are intended to be comprehended within the scope of the present application.
Claims (10)
1. A multi-strategy fuel injection method, comprising:
when fuel needs to be injected into a cylinder of an engine, detecting the current working condition of the engine;
if the current working condition is a low-speed low-load working condition or a high-speed working condition, determining a first injection quantity;
controlling a fuel injector to perform first main fuel injection to the cylinder according to the first injection quantity; wherein the first main fuel injection is a non-vortex cavitation injection;
if the current working condition is a low-speed high-load working condition, determining a second injection quantity;
controlling the fuel injector to perform second main fuel injection to the cylinder according to the second injection quantity; wherein the second main fuel injection is a vortex line cavitation injection;
if the current working condition is a common working condition, determining a third injection quantity and a fourth injection quantity;
controlling the fuel injector to perform third main fuel injection to the cylinder according to the third injection quantity; wherein the third main fuel injection is a vortex line cavitation injection;
controlling the fuel injector to perform a fourth main fuel injection to the cylinder according to the fourth injection quantity; wherein the fourth main fuel injection is a non-vortex cavitation injection.
2. The method of claim 1, wherein the detecting the current operating condition of the engine comprises:
detecting the current rail pressure and the current oil injection quantity of the engine;
determining the current working condition of the engine according to the current rail pressure, the current fuel injection quantity and a preset working condition diagram; the working condition diagram represents the corresponding relation of rail pressure, fuel injection quantity and working conditions.
3. The method of claim 2, wherein obtaining the operating map comprises:
performing three-dimensional combustion simulation on an oil supply system, a fuel injector and a combustion chamber of the engine to obtain injection parameters of fuel injection according to a double main injection mode under different rail pressures and injection quantities of the engine; the injection parameters comprise an excess air coefficient, the injection oil mass momentum of two main fuel injections and the overlapping area ratio of the two main fuel injections;
and determining the working condition map according to the injection parameters.
4. The method of claim 1, wherein the determining the third injection amount and the fourth injection amount comprises:
determining a total injection quantity according to a state parameter of the engine;
and determining a third injection quantity and a fourth injection quantity according to the total injection quantity and the preset injection quantity proportion.
5. A multi-strategy fuel injection apparatus, comprising:
the detection unit is used for detecting the current working condition of the engine when fuel needs to be injected into the cylinder of the engine;
the determining unit is used for determining a first injection quantity if the current working condition is a low-speed low-load working condition or a high-speed working condition;
a control unit configured to control a fuel injector to perform first main fuel injection to the cylinder according to the first injection amount; wherein the first main fuel injection is a non-vortex cavitation injection;
the determining unit is used for determining a second injection quantity if the current working condition is a low-speed high-load working condition;
the control unit is used for controlling the fuel injector to perform second main fuel injection to the cylinder according to the second injection quantity; wherein the second main fuel injection is a vortex line cavitation injection;
the determining unit is used for determining a third injection quantity and a fourth injection quantity if the current working condition is a common working condition;
the control unit is used for:
controlling the fuel injector to perform third main fuel injection to the cylinder according to the third injection quantity; wherein the third main fuel injection is a vortex line cavitation injection;
controlling the fuel injector to perform a fourth main fuel injection to the cylinder according to the fourth injection quantity; wherein the fourth main fuel injection is a non-vortex cavitation injection.
6. The device according to claim 5, wherein the detecting unit is configured to, when detecting a current operating condition of the engine:
detecting the current rail pressure and the current oil injection quantity of the engine;
determining the current working condition of the engine according to the current rail pressure, the current fuel injection quantity and a preset working condition diagram; the working condition diagram represents the corresponding relation of rail pressure, fuel injection quantity and working conditions.
7. The device according to claim 6, further comprising an obtaining unit configured to obtain the operating mode map, in particular configured to:
performing three-dimensional combustion simulation on an oil supply system, a fuel injector and a combustion chamber of the engine to obtain injection parameters of fuel injection according to a double main injection mode under different rail pressures and injection quantities of the engine; the injection parameters comprise an excess air coefficient, the injection oil mass momentum of two main fuel injections and the overlapping area ratio of the two main fuel injections;
and determining the working condition map according to the injection parameters.
8. The device according to claim 5, wherein when the determining unit determines the third injection amount and the fourth injection amount, the determining unit is specifically configured to:
determining a total injection quantity according to a state parameter of the engine;
and determining a third injection quantity and a fourth injection quantity according to the total injection quantity and the preset injection quantity proportion.
9. An electronic device comprising a memory and a processor;
the memory is used for storing a computer program;
the processor is configured to execute the computer program, in particular to implement the multi-strategy fuel injection method according to any one of claims 1 to 4.
10. An automobile is characterized by comprising an electronic control unit and an engine;
the electronic control unit is used for:
the multi-strategy fuel injection method according to any one of claims 1 to 4 controls fuel injection from a fuel injector of the engine to a cylinder of the engine while the engine is running.
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| CN202310669539.5A CN116398311B (en) | 2023-06-07 | 2023-06-07 | Multi-strategy fuel injection method, device, equipment and automobile |
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| CN118148788A (en) * | 2024-05-11 | 2024-06-07 | 潍柴动力股份有限公司 | Method and device for reducing cylinder sleeve temperature, electronic equipment and storage medium |
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| CN116398311B (en) | 2023-08-18 |
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