CN115467755A - Electric control method for fuel fractional injection of double nozzles of PFI engine - Google Patents
Electric control method for fuel fractional injection of double nozzles of PFI engine Download PDFInfo
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- 238000002347 injection Methods 0.000 title claims abstract description 249
- 239000007924 injection Substances 0.000 title claims abstract description 249
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000446 fuel Substances 0.000 title claims description 20
- 230000001360 synchronised effect Effects 0.000 claims abstract description 15
- 238000005507 spraying Methods 0.000 claims description 21
- 238000004364 calculation method Methods 0.000 claims description 8
- 239000003921 oil Substances 0.000 abstract description 67
- 239000000295 fuel oil Substances 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 3
- 238000000889 atomisation Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 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
- F02D41/3094—Controlling fuel injection the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder
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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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Abstract
The invention provides an electric control method for fuel oil fractional injection of double nozzles of a PFI engine, which comprises the following steps: reading the required oil injection pulse width calculated by the logic by the EMS system, and judging whether the required oil injection pulse width is 0; when the pulse width is 0, the value of the oil injection pulse width of each nozzle is 0; when the required oil injection pulse width is not 0, the system judges the oil injection mode; when the double-nozzle fractional synchronous injection mode is adopted, the injection pulse width and the injection phase parameters of the first injection and the second injection of one nozzle of the reference cylinder are calculated, the injection parameter of one nozzle is assigned to the two nozzles, and then the injection parameters of other cylinders are synchronously calculated based on the fixed angle difference; and when the double-nozzle single asynchronous injection mode is adopted, the injection pulse width and the injection phase of the two nozzles of the reference cylinder are respectively calculated according to the fractional injection condition of the single-nozzle mode, and then the injection parameters of other cylinders are synchronously calculated based on the fixed angle difference. The electric control method for the fuel oil fractional injection of the double nozzles of the PFI engine can simplify the logic structure, reduce the calculated amount and reduce the burden of a CPU.
Description
Technical Field
The invention relates to an electric control method for fuel oil fractional injection of double nozzles of a PFI engine, which is applied to the technical field of automobile engines.
Background
At present, a port injection technology (PFI) is one of the main technologies for supplying fuel to a modern internal combustion engine, and compared with a direct injection in cylinder (GDI), the PFI has the advantages of low hardware production cost, less particulate matter emission, low engine oil dilution risk, difficulty in generating valve carbon deposition and the like, so that the PFI is widely applied to low-end engines with small displacement. The port injection technology (PFI) can mix fuel and fresh air in advance and then feed the mixture into a cylinder for combustion, so that the uniformity of the mixture can directly influence the performance of the PFI engine.
To improve the atomization effect of port injection technology, advanced engine manufacturers have developed port single cylinder dual nozzle injection technology. The double-nozzle injection technology can realize wider fuel injection area and higher fuel atomization rate, and the installation position of the double nozzle can be closer to an inlet valve, so that fuel adhesion of an air inlet passage is reduced, and the economy of an engine is improved. Because the injection quality and the injection phase of each nozzle of each cylinder need to be calculated in the PFI dual-nozzle electronic control injection technology, if the fractional injection is involved, the fractional injection proportion of each nozzle of each cylinder needs to be calculated, the logic structure is complex, the workload is multiplied, and the load of a CPU is increased.
Therefore, under the background of the increasing new functions and insufficient memory of the control unit, a new electronic control method for fuel split injection of double nozzles of the PFI engine needs to be designed to simplify the logic so as to overcome the above problems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an electric control method for the fuel oil fractional injection of the double nozzles of the PFI engine, which can simplify the logic structure, reduce the calculated amount and reduce the burden of a CPU.
The invention is realized by the following steps:
the invention provides an electric control method for fuel oil fractional injection of double nozzles of a PFI engine, which comprises the following steps:
the method comprises the following steps: the EMS system reads the required oil injection pulse width calculated by the logic calculation and judges whether the required oil injection pulse width is 0 or not; when the required oil injection pulse width is 0, the value of the oil injection pulse width of each nozzle is 0;
step two: when the required oil injection pulse width is not 0, the EMS system judges the oil injection mode: identifying and judging a double-nozzle fractional synchronous injection mode and a double-nozzle single asynchronous injection mode by judging three calibratable Boolean variables of whether double nozzles are supported, whether double-nozzle synchronous injection is supported and whether multiple injection is supported;
when the double-nozzle fractional synchronous injection mode is adopted, the injection pulse width and the injection phase parameters of the first injection and the second injection of one nozzle of the reference cylinder are calculated, the injection parameter of one nozzle is assigned to the two nozzles, and then the injection parameters of other cylinders are synchronously calculated based on the fixed angle difference;
when in a double-nozzle single-time asynchronous injection mode, the oil injection pulse width and the oil injection phase of two nozzles of a reference cylinder are respectively calculated according to the fractional injection condition of a single-nozzle mode, namely the oil injection pulse width and the oil injection phase of one nozzle are the oil injection pulse width and the oil injection phase of one-nozzle primary injection, the oil injection pulse width and the oil injection phase of the two-way nozzle are the oil injection pulse width and the oil injection phase of single-nozzle secondary injection, and then the injection parameters of other cylinders are synchronously calculated based on a fixed angle difference;
step three: and feeding back the oil injection parameters to the ECU.
Further, in the second step, when the dual-nozzle fractional synchronous injection mode is used, the EMS system only calculates the injection parameters of the one nozzle of the reference cylinder, and first calculates the actual injection pulse widths Split1 and Split2 of the one nozzle of the first injection and the two injection:
Split1＝M*1/2*SplitInjectRatio/100+NullInjectTime；
Split2＝M*1/2*(100-SplitInjectRatio)/100+NullInjectTime；
wherein M is the total required fuel pulse width, splitInjectRatio is the proportion of one injection, and NullInjectTime is the invalid injection time determined by the nozzle characteristics;
then, calculating the oil injection phase parameters of one path of nozzle:
Inject_StartPos_1＝InjectEndPos_1-(vvtoffst_1+ctsoffst_1)-Split1/t*u；
Inject_StartPos_2＝Inject_EndPos_2-(vvtoffst_2+ctsoffst_2)-Split2/t*u；
if | Inject _ StartPos _2-InjectEndPos _1| < SplitMinDelta;
now Inject _ StartPos _2= InjectEndPos _1+ SplitMinDelta;
wherein, inject _ StartPos _1 and Inject _ StartPos _2 are respectively a first-spraying starting angle and a second-spraying starting angle, injectEndPos _1 and InjectEndPos _2 are respectively a first-spraying ending angle and a second-spraying ending angle, and are respectively a rack calibration quantity; splitMinDelta is the minimum interval of fractional injection; vvtoffsst _1, ctsoffsst _1, vvtoffsst _2 and ctsoffsst _2 are respectively the offset of the end positions of one-spraying oil injection and two-spraying oil injection, t is the period time of one tooth rotation of a crankshaft gear, and u is the angle corresponding to each tooth of the crankshaft;
and assigning the injection parameters of one nozzle to the two nozzles, and synchronously calculating the injection parameters of other cylinders based on the fixed angle difference.
Further, in the second step, when the dual-nozzle single asynchronous injection is performed, the injection pulse width and the injection phase of the two nozzles in the reference cylinder are calculated according to the fractional injection condition of the single-nozzle mode, and the actual injection pulse width of the one nozzle and the actual injection pulse width of the two nozzles are calculated:
M1＝M*SplitInjectRatio/100+NullInjectTime；
M2＝M*(100-SplitInjectRatio)/100+NullInjectTime；
wherein, M is the total required oil injection pulse width, splitInjectRatio is the proportion of the oil injection quantity of one path of nozzle, and NullInjectTime is the invalid oil injection time determined by the nozzle characteristics;
then calculating the oil injection phase parameters of the first path of nozzle and the second path of nozzle:
Inject_StartPos_1＝InjectEndPos_1-(vvtoffst_1+ctsoffst_1)-M1/t*u；
Inject_StartPos_2＝InjectEndPos_2-(vvtoffst_2+ctsoffst_2)-M2/t*u；
if | Inject _ StartPos _2-InjectEndPos _1| < SplitMinDelta;
now Inject _ StartPos _2= InjectEndPos _1+ SplitMinDelta;
wherein, inject _ StartPos _1 and Inject _ StartPos _2 are respectively one-way and two-way nozzle injection starting angles, injectEndPos _1 and InjectEndPos _2 are respectively one-way and two-way nozzle injection ending angles, and are the bench calibration quantity; the splitminda is the minimum interval of the fractional injection; vvtoffsst _1, ctsoffsst _1, vvtoffsst _2 and ctsoffsst _2 are respectively the offset of the oil injection end position of one path of two-way nozzle, t is the period time of one tooth rotating by the crankshaft gear, and u is the angle corresponding to each tooth of the crankshaft
The injection parameters of the other cylinders are then calculated synchronously on the basis of the fixed angle difference.
Further, in the step one, when the required oil injection pulse width is judged to be 0, the step three is directly carried out, and the oil injection parameters are fed back to the ECU.
The invention has the following beneficial effects:
the invention provides an electric control method for the fuel oil fractional injection of a double-nozzle of a PFI engine, which divides the fuel oil fractional injection of the double-nozzle into a double-nozzle fractional synchronous injection mode and a double-nozzle single asynchronous injection mode according to the common injection condition, can realize the calculation of fuel injection parameters under the condition of only using a fractional injection EOIT table and a fractional injection proportion table under the single-nozzle mode, effectively reduces the calculation amount of PFI double-nozzle fractional injection control, reduces the logic complexity, simplifies the logic structure, reduces the calculation amount and reduces the burden of a CPU.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a control flow chart of an electronic control method for fuel split injection of a double nozzle of a PFI engine according to an embodiment of the present invention.
Detailed Description
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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1, the invention provides an electronic control method for fuel split injection of a double-nozzle of a PFI engine, which comprises the following steps:
the method comprises the following steps: reading the required oil injection pulse width calculated by the logic by an EMS system (an engine management system) and judging whether the required oil injection pulse width is 0 or not; when the required oil injection pulse width is 0, the value of the oil injection pulse width of each nozzle is 0;
step two: when the required oil injection pulse width is not 0, the system judges the oil injection mode: identifying and judging a double-nozzle fractional synchronous injection mode and a double-nozzle single asynchronous injection mode by judging three calibratable Boolean variables of whether to support double nozzles, whether to support double-nozzle synchronous injection and whether to support multiple injection;
when the double-nozzle fractional synchronous injection mode is adopted, the injection pulse width and the injection phase parameters of the first injection and the second injection of one nozzle of the reference cylinder are calculated, the injection parameter of one nozzle is assigned to the two nozzles, and then the injection parameters of other cylinders are synchronously calculated based on the fixed angle difference.
The specific design is as follows: when the dual-nozzle fractional synchronous injection mode is adopted, the EMS system only calculates the oil injection parameters of one nozzle of the reference cylinder, and calculates the actual oil injection pulse widths Split1 and Split2 of the first nozzle and the second nozzle of the reference cylinder:
Split1＝M*1/2*SplitInjectRatio/100+NullInjectTime；
Split2＝M*1/2*(100-SplitInjectRatio)/100+NullInjectTime；
wherein M is the total required fuel pulse width, splitInjectRatio is the proportion of one injection, and NullInjectTime is the invalid injection time determined by the nozzle characteristics;
then calculating the oil injection phase parameters of one path of nozzle:
Inject_StartPos_1＝InjectEndPos_1-(vvtoffst_1+ctsoffst_1)-Split1/t*u；
Inject_StartPos_2＝Inject_EndPos_2-(vvtoffst_2+ctsoffst_2)-Split2/t*u；
if | Inject _ StartPos _2-InjectEndPos _1| < SplitMinDelta;
at this time Inject _ StartPos _2= InjectEndPos _1+ SplitMinDelta;
wherein, inject _ StartPos _1 and Inject _ StartPos _2 are respectively a first-spraying starting angle and a second-spraying starting angle, injectEndPos _1 and InjectEndPos _2 are respectively a first-spraying ending angle and a second-spraying ending angle, and are respectively a rack calibration quantity; splitMinDelta is the minimum interval of fractional injection; vvtoffsst _1, ctsoffsst _1, vvtoffsst _2 and ctsoffsst _2 are respectively the offset of the end positions of one-spraying oil injection and two-spraying oil injection, t is the period time of one tooth rotation of a crankshaft gear, and u is the angle corresponding to each tooth of the crankshaft;
and assigning the injection parameters of one nozzle to the two nozzles, and synchronously calculating the injection parameters of other cylinders based on the fixed angle difference.
And when the double-nozzle single asynchronous injection mode is adopted, the oil injection pulse width and the oil injection phase of two nozzles of the reference cylinder are respectively calculated according to the fractional injection condition of the single-nozzle mode, namely the oil injection pulse width and the oil injection phase of one nozzle are the oil injection pulse width and the oil injection phase of one-nozzle primary injection, the oil injection pulse width and the oil injection phase of the two-way nozzle are the oil injection pulse width and the oil injection phase of single-nozzle secondary injection, and then the injection parameters of other cylinders are synchronously calculated based on the fixed angle difference. The specific design is as follows:
when in a double-nozzle single asynchronous injection mode, the oil injection pulse width and the oil injection phase of two nozzles of a reference cylinder are respectively calculated according to the fractional injection condition of a single-nozzle mode, and the actual oil injection pulse width of one nozzle and the actual oil injection pulse width of two nozzles are firstly calculated:
M1＝M*SplitInjectRatio/100+NullInjectTime；
M2＝M*(100-SplitInjectRatio)/100+NullInjectTime；
wherein, M is the total required oil injection pulse width, splitInjectRatio is the oil injection quantity ratio of one path of nozzle, and NullInjectTime is the invalid oil injection time determined by the nozzle characteristics;
then calculating the oil injection phase parameters of the first nozzle and the second nozzle:
Inject_StartPos_1＝InjectEndPos_1-(vvtoffst_1+ctsoffst_1)-M1/t*u；
Inject_StartPos_2＝InjectEndPos_2-(vvtoffst_2+ctsoffst_2)-M2/t*u；
if | Inject _ StartPos _2-InjectEndPos _1| < SplitMinDelta;
now Inject _ StartPos _2= InjectEndPos _1+ SplitMinDelta;
wherein, inject _ StartPos _1 and Inject _ StartPos _2 are respectively one-way and two-way nozzle injection starting angles, injectEndPos _1 and InjectEndPos _2 are respectively one-way and two-way nozzle injection ending angles, and are the bench calibration quantity; the splitminda is the minimum interval of the fractional injection; vvtoffsst _1, ctsoffsst _1, vvtoffsst _2 and ctsoffsst _2 are respectively the offset of the oil injection end position of one path of two-way nozzle, t is the cycle time of one tooth rotating of the crankshaft gear, and u is the angle corresponding to each tooth of the crankshaft.
And synchronously calculating the injection parameters of other cylinders based on the fixed angle difference.
Step three: and feeding back the oil injection parameters to the ECU, thus completing the electric control strategy for calculating the oil injection parameters. In the first step, when the required oil injection pulse width is judged to be 0, the step three is directly carried out, and the oil injection parameters are fed back to the ECU, namely the electric control strategy for calculating the oil injection parameters is completed.
In any injection mode, the injection time needs to be calculated based on a reference cylinder (for example, four cylinders), the injection time of each of the other cylinders has a fixed angle difference (taking a four-cylinder machine as an example, 360 degrees for one cylinder, 540 degrees for three cylinders, and 180 degrees for two cylinders), and the end position is 720 degrees at the latest from the compression top dead center of one cylinder;
in the implementation of the invention, through the design, under the condition of using only the fractional injection EOIT related calibration and the fractional injection proportion calibration under the single-nozzle mode, the calculation of each parameter of the double-nozzle fractional synchronous injection (the EOIT and the injection proportion of each injection are independently markable) and the double-nozzle single asynchronous injection (actually similar fractional injection, the EOIT and the injection proportion of each nozzle are independently markable) is realized, the calculation amount of the PFI double-nozzle fractional injection control is effectively reduced, the logic complexity is reduced, the logic structure is simplified, the calculation amount is reduced, and the burden of a CPU is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (4)
1. An electronic control method for fuel split injection of a double nozzle of a PFI engine is characterized by comprising the following steps:
the method comprises the following steps: the EMS system reads the required oil injection pulse width calculated by the logic calculation and judges whether the required oil injection pulse width is 0 or not; when the required oil injection pulse width is 0, the value of the oil injection pulse width of each nozzle is 0;
step two: when the required oil injection pulse width is not 0, the EMS system judges the oil injection mode: identifying and judging a double-nozzle fractional synchronous injection mode and a double-nozzle single asynchronous injection mode by judging three calibratable Boolean variables of whether to support double nozzles, whether to support double-nozzle synchronous injection and whether to support multiple injection;
when the dual-nozzle fractional synchronous injection mode is adopted, the injection pulse width and the injection phase parameters of the first injection and the second injection of one nozzle of the reference cylinder are calculated, the injection parameters of the first nozzle are assigned to the two nozzles, and then the injection parameters of other cylinders are synchronously calculated based on the fixed angle difference;
when in a double-nozzle single-time asynchronous injection mode, the oil injection pulse width and the oil injection phase of two nozzles of a reference cylinder are respectively calculated according to the fractional injection condition of a single-nozzle mode, namely the oil injection pulse width and the oil injection phase of one nozzle are the oil injection pulse width and the oil injection phase of one-nozzle primary injection, the oil injection pulse width and the oil injection phase of the two-way nozzle are the oil injection pulse width and the oil injection phase of single-nozzle secondary injection, and then the injection parameters of other cylinders are synchronously calculated based on a fixed angle difference;
step three: and feeding back the oil injection parameters to the ECU.
2. An electronic control method of the two-nozzle fuel split injection of the PFI engine as claimed in claim 1, wherein:
in the second step, when the dual-nozzle fractional synchronous injection mode is adopted, the EMS system only calculates the oil injection parameters of one nozzle of the reference cylinder, and calculates the actual oil injection pulse widths Split1 and Split2 of the first nozzle and the second nozzle of the first nozzle:
Split1＝M*1/2*SplitInjectRatio/100+NullInjectTime；
Split2＝M*1/2*(100-SplitInjectRatio)/100+NullInjectTime；
wherein M is the total required fuel pulse width, splitInjectRatio is the fuel injection proportion, and NullInjectTime is the invalid fuel injection time determined by the nozzle characteristics;
then, calculating the oil injection phase parameters of one path of nozzle:
Inject_StartPos_1＝InjectEndPos_1-(vvtoffst_1+ctsoffst_1)-Split1/t*u；
Inject_StartPos_2＝Inject_EndPos_2-(vvtoffst_2+ctsoffst_2)-Split2/t*u；
if | Inject _ StartPos _2-InjectEndPos _1| < SplitMinDelta;
at this time Inject _ StartPos _2= InjectEndPos _1+ SplitMinDelta;
wherein, inject _ StartPos _1 and Inject _ StartPos _2 are respectively a first spraying starting angle and a second spraying starting angle, injectEndPos _1 and InjectEndPos _2 are respectively a first spraying ending angle and a second spraying ending angle, and are respectively a bench calibration quantity; splitMinDelta is the minimum interval of fractional injection; vvtoffsst _1, ctsoffsst _1, vvtoffsst _2 and ctsoffsst _2 are respectively the offset of the end positions of one-spraying oil injection and two-spraying oil injection, t is the period time of one tooth rotation of a crankshaft gear, and u is the angle corresponding to each tooth of the crankshaft;
and assigning the spraying parameters of one nozzle to the spraying parameters of the two nozzles, and synchronously calculating the spraying parameters of other cylinders based on the fixed angle difference.
3. An electronic control method for the split injection of fuel into two nozzles of a PFI engine as claimed in claim 1, wherein:
in the second step, when the double-nozzle single asynchronous injection is performed, the oil injection pulse width and the oil injection phase of the two nozzles in the reference cylinder are respectively calculated according to the fractional injection condition of the single-nozzle mode, and the actual oil injection pulse width of the one nozzle and the actual oil injection pulse width of the two nozzles are firstly calculated:
M1＝M*SplitInjectRatio/100+NullInjectTime；
M2＝M*(100-SplitInjectRatio)/100+NullInjectTime；
wherein, M is the total required oil injection pulse width, splitInjectRatio is the oil injection quantity ratio of one path of nozzle, and NullInjectTime is the invalid oil injection time determined by the nozzle characteristics;
then calculating the oil injection phase parameters of the first path of nozzle and the second path of nozzle:
Inject_StartPos_1＝InjectEndPos_1-(vvtoffst_1+ctsoffst_1)-M1/t*u；
Inject_StartPos_2＝InjectEndPos_2-(vvtoffst_2+ctsoffst_2)-M2/t*u；
if | Inject _ StartPos _2-InjectEndPos _1| < SplitMinDelta;
at this time Inject _ StartPos _2= InjectEndPos _1+ SplitMinDelta;
wherein, inject _ StartPos _1 and Inject _ StartPos _2 are respectively one-way and two-way nozzle injection starting angles, injectEndPos _1 and InjectEndPos _2 are respectively one-way and two-way nozzle injection ending angles, and are the bench calibration quantity; splitMinDelta is the minimum interval of fractional injection; vvtoffsst _1, ctsoffsst _1, vvtoffsst _2 and ctsoffsst _2 are respectively the offset of the oil injection end position of one path of two-path nozzle, t is the period time of one tooth rotating of the crankshaft gear, and u is the angle corresponding to each tooth of the crankshaft
The injection parameters of the other cylinders are then calculated synchronously on the basis of the fixed angle difference.
4. An electronic control method for the split injection of fuel into two nozzles of a PFI engine as claimed in claim 1, wherein: in the first step, when the required oil injection pulse width is judged to be 0, the step three is directly carried out, and the oil injection parameters are fed back to the ECU.
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