CN114087081B - Injection control method and device for methanol engine and vehicle - Google Patents
Injection control method and device for methanol engine and vehicle Download PDFInfo
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- CN114087081B CN114087081B CN202111443919.4A CN202111443919A CN114087081B CN 114087081 B CN114087081 B CN 114087081B CN 202111443919 A CN202111443919 A CN 202111443919A CN 114087081 B CN114087081 B CN 114087081B
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- 238000002347 injection Methods 0.000 title claims abstract description 216
- 239000007924 injection Substances 0.000 title claims abstract description 216
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000000446 fuel Substances 0.000 claims description 98
- 238000002474 experimental method Methods 0.000 claims description 17
- 238000012937 correction Methods 0.000 claims description 9
- 230000015654 memory Effects 0.000 claims description 9
- 238000001704 evaporation Methods 0.000 abstract description 13
- 230000008020 evaporation Effects 0.000 abstract description 13
- 238000002485 combustion reaction Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 8
- 238000005299 abrasion Methods 0.000 abstract description 5
- 239000007921 spray Substances 0.000 abstract description 5
- 230000002411 adverse Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 78
- 238000002156 mixing Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000000889 atomisation Methods 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
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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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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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)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention provides an injection control method and device for a methanol engine and a vehicle, and belongs to the technical field of methanol engine control. The injection control method includes: calculating the oil injection duration corresponding to each load working condition; determining a target oil injection starting time according to the maximum value in each oil injection duration and the engine performance parameters; and controlling the oil injector to inject oil according to the target oil injection opening time and the target oil injection duration corresponding to the current load working condition. The invention also provides a control unit for executing the injection control method and a vehicle comprising the control unit. The injection control method, the control device and the vehicle can improve the adverse effects of short spray evaporation time and serious wet wall in the cylinder on the abrasion and combustion of the cylinder sleeve, simplify the calculation process and save the calculation time.
Description
Technical Field
The invention belongs to the technical field of methanol engine control, and particularly relates to an injection control method and device for a methanol engine and a vehicle.
Background
The methanol fuel is basically known clean energy at present, and the heavy pure methanol fuel (M100) engine has the advantages of high efficiency, energy conservation, environmental protection and the like. The methanol fuel is liquid at normal temperature, has low cetane number and high autoignition temperature, and is difficult to be subjected to compression ignition. The M100 engine is similar to a gasoline engine in that a spark plug ignition mode is adopted, and a fuel injection control mode is also the same as that of the gasoline engine, so that in order to form a homogeneous combustible mixture (fuel, air and the like) at the ignition time, fuel needs to be injected before an intake valve of the cycle is opened to obtain a good spray evaporation effect.
The prior spark-ignition gasoline engine and the pure methanol fuel engine basically adopt an electric control air inlet channel sequential injection mode and a sequential ignition mode of each cylinder, after the sequential injection of each cylinder is finished, the air inlet channel is premixed to form mixed gas of fuel oil, air and the like, in the opening process of an inlet valve, the mixed gas enters the cylinder to be further fully mixed, and near the compression top dead center, a spark plug is ignited by spark jumping to finish the sequential ignition of each cylinder. Taking a certain six-cylinder engine as an example, the fuel inlet channel of each cylinder sequentially injects fuel and fires in sequence, and the injection and firing sequence is 1-5-3-6-2-4. Taking the first cylinder fuel injection control of the cycle as an example, in order to avoid fuel injection too early, the fuel injection is started before the intake valve of the first cylinder of the previous cycle is not closed, so that the fuel is directly injected into the first cylinder of the previous cycle; meanwhile, in order to avoid that the oil injection stop time is too late, after the intake valve of the cycle is opened, the fuel injection is not finished, the fuel is directly injected into the first cylinder of the cycle, so that the fuel spray evaporation effect is poor, the wet wall in the cylinder is serious, and the combustion and the reliability of the engine are not good. Therefore, it is necessary to select a proper fuel injection cut-off time through certain analysis and calculation to avoid direct fuel injection into the cylinder when the intake valve is opened. At present, both gasoline engines and pure methanol engines adopt a valve closing injection strategy for defining an oil injection stop time, namely, a proper oil injection stop time is defined, fuel injection is guaranteed to be completed when an intake valve is closed, the oil injection stop time is fixed at the same time no matter under a full load condition or a partial load condition, and the oil injection opening time is calculated and adjusted by an engine ECU (electronic control unit) according to the fuel quantity required by the load condition.
However, the methanol fuel has large vaporization latent heat value, high dynamic requirement of heavy methanol engine, large fuel injection quantity requirement and long injection pulse width (measured by a crank angle), and the closed-valve injection strategy defining the oil injection cut-off time is adopted, so that the spray evaporation time is short, the wet wall in the cylinder is serious, and the abrasion and the combustion of the cylinder sleeve are not favorable under all working conditions.
Disclosure of Invention
It is an object of the first aspect of the present invention to provide an injection control method for a methanol engine that improves the short spray evaporation time and the severe adverse effects of cylinder liner wear and combustion from cylinder wet walls.
It is a further object of the invention to simplify the calculation process and save calculation time.
An object of the second aspect of the invention is to provide a control apparatus including an injection control method for executing the methanol engine described above.
It is an object of a third aspect of the invention to provide a vehicle including the control apparatus described above.
Specifically, the present invention provides an injection control method for a methanol engine, including:
calculating the fuel injection duration corresponding to each load working condition;
determining a fixed target oil injection starting moment according to the maximum value in each oil injection duration and the engine performance parameters;
and controlling the oil injector to inject oil according to the target oil injection opening time and the target oil injection duration corresponding to the current load working condition.
Optionally, the step of determining a target fuel injection start time based on a maximum value of each of said fuel injection durations and an engine performance parameter comprises:
calculating a first oil injection opening time according to the maximum value in the oil injection duration period;
determining a plurality of candidate oil injection starting moments according to the first oil injection starting moment;
carrying out an engine calibration experiment on each candidate oil injection starting moment;
and selecting the target oil injection opening time from the candidate oil injection opening times according to the engine performance parameters obtained by the engine calibration experiment.
Optionally, the engine performance parameters include fuel consumption rate and emission performance; the step of selecting the target fuel injection opening time from the plurality of candidate fuel injection opening times according to the engine performance parameters comprises:
and selecting the candidate oil injection opening time corresponding to the working condition point which has the lowest oil consumption rate and meets the emission requirement from the data of the engine calibration experiment as the target oil injection opening time.
Optionally, the step of determining a plurality of candidate fuel injection opening times from the first fuel injection opening time comprises:
generating a plurality of experiment points with preset number by taking the first oil injection starting moment as an initial value and taking the target variable quantity as decrement;
and eliminating values exceeding the starting moment of the air intake circulation in the plurality of experimental points to obtain a plurality of candidate oil injection opening moments.
Optionally, the step of calculating the injection duration corresponding to each load condition includes:
determining a basic fuel injection quantity according to the current load and the engine speed;
determining an oil injection quantity correction value according to the EGR flow and the excess air coefficient;
determining the single-cylinder fuel injection quantity of each air inlet cycle according to the basic fuel injection quantity and the fuel injection quantity correction value;
and determining the fuel injection duration according to the single-cylinder fuel injection quantity, the engine speed and the fuel injector characteristic of each air intake cycle.
In particular, the invention also provides a control device, which comprises a memory and a processor, wherein the memory stores a control program, and the control program is used for realizing the injection control method in any one of the above-mentioned items when being executed by the processor.
Optionally, the control device is an electronic engine controller.
In particular, the invention also provides a vehicle comprising the control device.
The invention changes the oil injection stop time into the oil injection opening time (namely the target oil injection opening time) in the prior art, can prolong the retention time of the fuel injected in most working conditions in the air inlet passage to the maximum extent, improves the wall evaporation and mixed gas mixing effect, reduces the wet wall phenomenon in the cylinder, and improves the problems of engine combustion, cylinder sleeve abrasion and the like to a certain extent.
Furthermore, the target oil injection opening time is defined, the fixed target oil injection opening time is determined according to the maximum value in each oil injection duration and an engine calibration experiment, and then the oil injection control strategies under various working conditions can be determined by combining the calculated oil injection durations corresponding to the various load working conditions, namely the oil injection opening time and the oil injection duration are determined, so that the problems of short fuel evaporation and atomization time and the like under most working conditions are solved, the calculation and calibration work is relatively simple, and the calculation resources and the calculation time are saved.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a flow chart of an injection control method according to one embodiment of the present disclosure;
FIG. 2 is an injection timing diagram of an injection control method according to one embodiment of the present invention;
fig. 3 is a flowchart corresponding to the step of determining the target fuel injection opening timing in the injection control method according to one embodiment of the present invention.
Detailed Description
Fig. 1 is a flowchart of an injection control method according to an embodiment of the present invention. Fig. 2 is an injection timing chart of the injection control method according to one embodiment of the invention. As shown in fig. 1, in one embodiment, an injection control method for a methanol engine of the present invention includes:
and step S100, calculating the fuel injection duration corresponding to each load working condition.
The load condition refers to the condition corresponding to different loads of the methanol engine, such as full-load operation, 50% load condition and the like.
Specifically, for each load working condition, the corresponding air-fuel ratio can be calculated through the load value of the engine and the rotating speed of the engine, then the single-cylinder fuel injection quantity of each air intake cycle of the engine can be calculated according to the air-fuel ratio, then the crank angle can be calculated according to the single-cylinder fuel injection quantity of each air intake cycle, the rotating speed of the engine and the characteristics of the fuel injector, and further the fuel injection duration is determined according to the crank angle.
The injector characteristic refers to the flow rate (g/min) of the injector. The specific method for calculating the crank angle may refer to the description in the related art, and is not described herein again. The fuel injector duration may be calculated in crank angle, i.e. the amount of change in crank angle corresponds to the fuel injection duration, which may be expressed as 500 ° CA, for example, the crank angle is 500 °.
Step S200, determining a fixed target fuel injection opening time according to the maximum value of each fuel injection duration and the engine performance parameter.
In order to take care of all operating conditions, the target injection opening time is determined with reference to the operating condition with the longest injection duration. Meanwhile, the target fuel injection opening time is finally determined by considering the engine performance, such as oil consumption, emission and other factors, and the consideration of the engine performance parameters can be determined through the engine calibration experiment.
And step S300, controlling the oil injector to inject oil according to the target oil injection opening time and the target oil injection duration corresponding to the current load working condition.
And when the starting point (namely the target fuel injection opening time) and the duration (namely the fuel injection duration) are determined, the fuel injector can be controlled to perform corresponding sequential fuel injection.
It should be noted that the target injection opening time here is an opening point that is applicable to all operating conditions. That is, all operating conditions of the present embodiment employ a closed-valve injection strategy that defines the start of injection. As shown IN FIG. 2, the abscissa of FIG. 2 is crank angle IN degrees, the ordinate is valve lift IN mm, n # -IN represents the nth cylinder, the last intake cycle between A and C, the present intake cycle from D, point B represents the target fuel injection opening time, the dashed arrow a represents full load condition, and C to D represent 3 partial load conditions listed.
According to the embodiment, the oil injection stop time is changed into the oil injection opening time (namely the target oil injection opening time) by defining the oil injection stop time in the prior art, so that the retention time of fuel injected in most working conditions in an air inlet channel can be prolonged to the maximum extent, the wall evaporation and mixed gas mixing effects are improved, the wet wall phenomenon in a cylinder is reduced, and the problems of engine combustion, cylinder sleeve abrasion and the like are improved to a certain extent.
Further, according to the development experience of the previous methanol engine, except for the characteristic working conditions of individual high rotation speed, the oil injection cut-off time has a space for forward adjustment, the oil injection cut-off time is adjusted forward, the evaporation time of the wall surface of the fuel oil staying in the air inlet channel is long, the evaporation effect is good, the mixing is more sufficient, and the problems of combustion and wet wall in the cylinder are improved. However, the calculation is performed for all the working conditions one by one, and then different cut-off times are defined, so that the calculation and calibration work becomes very complicated and difficult to control. In the embodiment, the target oil injection opening time is defined, the fixed target oil injection opening time is determined according to the maximum value in each oil injection duration and an engine calibration experiment, and then the oil injection control strategies under various working conditions can be determined by combining the calculated oil injection durations corresponding to the various load working conditions, namely the oil injection opening time and the stop time are determined, so that the problems of short fuel evaporation and atomization time and the like under most working conditions are solved, the calculation and calibration work is relatively simple, and the calculation resources and the calculation time are saved.
Fig. 3 is a flowchart corresponding to the step of determining the target fuel injection opening timing in the injection control method according to one embodiment of the present invention. As shown in fig. 3, in one embodiment, step S200 includes:
in step S202, a first injection opening time is calculated based on a maximum value of the injection duration.
Since the fuel injection start timing = fuel injection duration + intake early opening angle + crank angle from intake top dead center to intake bottom dead center, the first fuel injection start timing in this step = maximum value in fuel injection duration + intake early opening angle + crank angle from intake top dead center to intake bottom dead center (180 °). Assuming that the maximum value of the calculated injection duration is 500 ° CA and the intake early opening angle is selected to be 20 ° CA, then the first injection opening moment is 700 ° CA, where the intake early opening angle may be selected in the range of 5 ° CA to 35 ° CA.
And step S204, determining a plurality of candidate oil injection opening moments according to the first oil injection opening moment.
That is, the first injection opening time is used as a reference value to generate a plurality of candidate injection opening times for experiment. In one embodiment, a predetermined number of test points are generated with the first injection opening timing as an initial value and the target variation amount as a decrement, for example, 720 ° CA, 710 ° CA, 700 ° CA, 690 ° CA, 680 ° CA, 670 ° CA are generated for each test point when the first injection opening timing is 700 ° CA, where 10 ° is the target variation amount and the predetermined number is 6. And eliminating values exceeding the starting moment of the air intake circulation in the plurality of experimental points to obtain a plurality of candidate oil injection opening moments. As shown in fig. 2, since the injection will enter the intake process of the previous cycle when the experimental values of 720 ° CA, 710 ° CA, 700 ° CA, etc. are selected, the values smaller than 700 ° CA are selected, i.e. 720 ° CA, 710 ° CA, 700 ° CA are eliminated. Of course, if the generated test point does not cause the injection to enter the intake process of the previous cycle, the points before and after the first injection opening time may be selected, for example, the first injection opening time is 650 ° CA, and 670 ° CA, 660 ° CA, 650 ° CA, 640 ° CA, and 630 ° CA are generated as the respective test points, and these points are selected so as not to cause the injection to enter the intake process of the previous cycle, and therefore, they may be used as the candidate injection opening times.
And step S206, carrying out an engine calibration experiment on each candidate oil injection opening moment.
The engine is tested according to each candidate oil injection starting time, namely, the power, the torque and the oil consumption rate corresponding to each rotating speed are measured by changing the rotating speed of the engine when the engine is in full load, and then data are processed into a curve, namely an engine external characteristic curve.
And S208, selecting a target oil injection opening time from the multiple candidate oil injection opening times according to the engine performance parameters obtained by the engine calibration experiment.
The engine performance comprises the performances of dynamic property, fuel economy, environmental protection performance, light weight and the like, a target curve with better performance can be selected on the engine external characteristic curve corresponding to each candidate fuel injection opening moment by taking one or more performances as the basis according to different requirements, and the candidate fuel injection opening moment corresponding to the target curve is the target fuel injection opening moment. In one embodiment, the engine performance parameters include fuel consumption rate and emission performance, and step S208 includes: and selecting the candidate oil injection opening time corresponding to the working condition point which has the lowest oil consumption rate and meets the emission performance requirement as the target oil injection opening time. Namely, the oil consumption values and the emission values corresponding to the working points on the external characteristic curves of the engines are compared, then the working point which meets the emission requirement and has the lowest oil consumption value is selected, and then the candidate oil injection opening time corresponding to the external characteristic curve corresponding to the working point is used as the target oil injection opening time. The target injection opening time selected here is only one value, which is suitable for different operating conditions.
The injection control method can be more clearly understood through the embodiment, and the calculation and calibration work of the injection control method is relatively simple, so that the calculation resource and the calculation time can be saved.
In another embodiment, step S100 includes:
the basic fuel injection quantity is determined according to the current load and the engine speed.
The power demand can be calculated according to the load and the engine, and the basic fuel injection quantity is calculated according to the working point efficiency and the power demand.
And determining an oil injection correction value according to the EGR flow and the excess air coefficient.
Because the actual EGR flow and the air quantity are fluctuated, the relationship of the EGR flow, the excess air coefficient and the fuel injection quantity correction value can be obtained according to a calibration experiment, and then the fuel injection quantity correction value is determined according to the current EGR flow and the excess air coefficient.
And determining the single-cylinder fuel injection quantity of each intake cycle according to the basic fuel injection quantity and the fuel injection quantity correction value.
The total fuel injection quantity can be obtained according to the basic fuel injection quantity and the fuel injection quantity correction value, and the total fuel injection quantity is averaged to a single cylinder, namely the single-cylinder fuel injection quantity.
And determining the fuel injection duration according to the single-cylinder fuel injection quantity, the engine speed and the fuel injector characteristic of each air intake cycle. The injection duration is here measured in crank angle degrees.
The invention also provides a control device comprising a memory and a processor, wherein the memory stores a control program, and the control program is used for realizing the injection control method according to any one of the embodiments and the combination of the embodiments when being executed by the processor. The processor may be a Central Processing Unit (CPU), a digital processing unit, or the like. The processor receives and transmits data through the communication interface. The memory is used for storing programs executed by the processor. The memory is any medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, or a combination of memories. The above-described computing program may be downloaded from a computer-readable storage medium to a corresponding computing/processing device or to a computer or external storage device via a network (e.g., the internet, a local area network, a wide area network, and/or a wireless network).
In one embodiment, the control device is an engine electronic controller (engine ECU).
The invention also provides a vehicle comprising the control device.
The control unit and the vehicle change the definition of the oil injection stop time into the definition of the oil injection opening time (namely the target oil injection opening time) in the prior art, so that the residence time of the injected fuel in the air inlet passage in most working conditions can be prolonged to the maximum extent, the wall evaporation and mixed gas mixing effects are improved, the wet wall phenomenon in the cylinder is reduced, and the problems of engine combustion, cylinder sleeve abrasion and the like are improved to a certain extent.
Furthermore, the fixed target oil injection starting time is determined according to the maximum value in each oil injection duration and an engine calibration experiment by defining the target oil injection starting time, and then the oil injection control strategies under various working conditions can be determined by combining the calculated oil injection durations corresponding to the various load working conditions, namely the oil injection starting time and the oil injection stopping time are determined, so that the problems of short fuel evaporation and atomization time and the like under most working conditions are solved, the calculation and calibration work is relatively simple, and the calculation resources and the calculation time are saved.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (7)
1. An injection control method for a methanol engine, characterized by comprising:
calculating the fuel injection duration corresponding to each load working condition;
determining a target oil injection starting time according to the maximum value in each oil injection duration and the engine performance parameters;
controlling the oil injector to inject oil according to the target oil injection opening time and the target oil injection duration corresponding to the current load working condition;
the step of determining a target fuel injection opening time based on the maximum value of each of the fuel injection durations and the engine performance parameter includes:
calculating a first oil injection opening time according to the maximum value in the oil injection duration period;
determining a plurality of candidate oil injection starting moments according to the first oil injection starting moment;
carrying out an engine calibration experiment on each candidate oil injection opening moment;
and selecting the target oil injection opening time from the candidate oil injection opening times according to the engine performance parameters obtained by the engine calibration experiment.
2. The injection control method according to claim 1, characterized in that the engine performance parameters include a fuel consumption rate and an emission performance; the step of selecting the target oil injection opening time from the plurality of candidate oil injection opening times according to the engine performance parameters obtained by the engine calibration experiment comprises the following steps:
and selecting the candidate oil injection opening time corresponding to the working condition point which has the lowest oil consumption rate and meets the emission requirement from the data of the engine calibration experiment as the target oil injection opening time.
3. The injection control method of claim 1, wherein determining a plurality of candidate injection start timings based on the first injection start timing comprises:
generating a plurality of experiment points with preset number by taking the first oil injection starting moment as an initial value and taking the target variable quantity as decrement;
and eliminating values exceeding the starting moment of the air intake circulation in the plurality of experimental points to obtain a plurality of candidate oil injection opening moments.
4. The injection control method according to any one of claims 1 to 3, characterized in that the step of calculating the fuel injection duration for each load condition comprises:
determining a basic fuel injection quantity according to the current load and the engine speed;
determining an oil injection correction value according to the EGR flow and the excess air coefficient;
determining the single-cylinder fuel injection quantity of each air inlet cycle according to the basic fuel injection quantity and the fuel injection quantity correction value;
and determining the fuel injection duration according to the single-cylinder fuel injection quantity, the engine speed and the fuel injector characteristic of each air intake cycle.
5. An engine control apparatus comprising a memory and a processor, the memory storing a control program that is executed by the processor to implement the injection control method according to any one of claims 1 to 4.
6. The engine control apparatus according to claim 5,
the engine control device is an engine electronic controller.
7. A vehicle characterized by comprising the engine control apparatus of claim 5 or 6.
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| CN104343567A (en) * | 2013-07-30 | 2015-02-11 | 通用汽车环球科技运作有限责任公司 | System and method for controlling air flow through an engine based on a fuel injection duration limit |
| CN110318868A (en) * | 2019-07-12 | 2019-10-11 | 南京盖驰动力科技有限公司 | A kind of control system and its control method of methanol/natural gas flexible fuel engine |
| CN111102093A (en) * | 2019-12-13 | 2020-05-05 | 潍柴动力股份有限公司 | Method and system for improving injection quantity control precision of natural gas engine |
| CN112096535A (en) * | 2020-08-13 | 2020-12-18 | 东风汽车集团有限公司 | Engine fuel injection frequency control method and system and automobile |
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