CN105569863B - Engine fuel injection control method and engine electric-controlled unit - Google Patents
Engine fuel injection control method and engine electric-controlled unit Download PDFInfo
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- CN105569863B CN105569863B CN201511033390.3A CN201511033390A CN105569863B CN 105569863 B CN105569863 B CN 105569863B CN 201511033390 A CN201511033390 A CN 201511033390A CN 105569863 B CN105569863 B CN 105569863B
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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
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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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- Combustion & Propulsion (AREA)
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- 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
A kind of engine fuel injection control method and engine electric-controlled unit, include the following steps：Earliest fuel injection beginning point is obtained by maximum fuel injection pulsewidth and maximum spout oil phase position；Bottom software triggers oil spout driving function so that initial fuel injection starting point is calculated for the first time before the earliest fuel injection beginning point, and the timing for performing oil spout is set according to the initial fuel injection starting point；Judging to whether there is in the range of the trigger point to the crankshaft angle difference between the initial fuel injection starting point of triggering oil spout driving function for the first time has bent axle half-turn to update tooth；If there are bent axle half-turns in the range of the trigger point to the crankshaft angle difference between the initial fuel injection starting point of triggering oil spout driving function for the first time to update tooth, then selection is after the bent axle half-turn update tooth closest to the initial fuel injection starting point and before the initial fuel injection starting point, the bottom software triggers oil spout driving function so that actual fuel injection starting point is calculated again, and the timing for performing oil spout is reset according to the actual fuel injection starting point.
Description
Technical field
The present invention relates to the technical field of engine, especially a kind of engine fuel injection control method and engine electric-controlled list
Member is mainly used for the Injection Control of engine.
Background technology
For automobile engine generally using multiple cylinders, common cylinder number has 3 cylinders, 4 cylinders, 6 cylinders, 8 cylinders, 10 cylinders, 12 cylinders etc. at present.
It is the schematic diagram of four stroke operation strokes of cylinder as shown in Fig. 1 a to Fig. 1 d, cylinder shares suction stroke
Four (such as Fig. 1 a), compression travel (such as Fig. 1 b), working stroke (such as Fig. 1 c) and instroke (such as Fig. 1 d) strokes.Engine air
Cylinder includes the components such as inlet valve 11, exhaust valve 12, fuel injector 13, piston 14, toggle 15.It is bent in working stroke
The reciprocating motion of piston is transformed into the rotary motion of bent axle by handle link mechanism, is machine the thermal energy sent out after fuel combustion
Tool energy, externally exports power；And in other three strokes, since the rotary motion of bent axle is transformed into piston by effect of inertia again
Linear reciprocating motion, complete air inlet, compression and exhaust event.In every four work for completing air inlet-compression-acting-exhaust
In stroke, crank rotation two encloses, i.e., the crank rotation half-turn in each impulse stroke.
Cylinder needs to spray correctly by fuel injector in the correct time during primary acting is completed
Oil mass, the fuel injection beginning time and distributive value it is how many accuracy it is larger to engine performance impacts.Fig. 2 is the spray of cylinder
Oily sequence diagram, engine electric-controlled unit (ECU) determine best distributive value according to every operating parameter of engine, then export one
The control signal of a triggering fuel injector in this control signal, contains fuel injection beginning point and fuel injection pulsewidth, wherein oil spout arteries and veins
Width is the time span of each oil spout of fuel injector, and fuel injection pulsewidth determines the number of distributive value.Since engine speed is higher, often
Secondary injection time is very short, therefore the fuel injector control signal that engine electric-controlled unit provides is a very of short duration pulse signal, this
The time width of a pulse signal is exactly fuel injection pulsewidth.The fuel injection pulsewidth of each oil spout is not fixed, it turns with engine
The difference of parameters such as speed, load and air inflow and change, engine electric-controlled unit is calculated according to these parameters and is updated each time
The specific fuel injection pulsewidth of oil spout.
Engine is fitted with bent axle, in order to learn the stroke of cylinder (air inlet, compression, acting, exhaust) at any time,
A crankshaft signal disk is also equipped on bent axle, be in order to identify bent axle running position (engine stroke) and increased portion
Part, and rotated with crank rotation.Crankshaft signal disk generally has (60-2) a tooth, that is, has 2 hypodontias, this is for convenience
Identify the position of bent axle.Crankshaft signal disk is that magnetoelectric transducer and Hall sensor work for convenience for dentation, conducive to formation
The square wave of high and low level, such software can infer the detailed movement situation of bent axle according to the square wave of high and low level.Bent axle turns
A dynamic circle is 360 degree, totally 60 crank teeths, each crank teeth is 6 degree.The half-turn of crankshaft signal disk i.e. 30 crank teeth (180
Degree).
As above mentioned, the oil spouts variable such as the fuel injection pulsewidth of each oil spout and oil spout phase is variation, existing for spray
The angle period is usually used (such as every the i.e. 180 degree update of bent axle half-turn in the update of the oil spouts such as oil phase position and fuel injection pulsewidth variable
Once).If using an oil spout variable is updated per bent axle half-turn (i.e. bent axle often rotates half-turn i.e. 180 degree) it is necessary in bent axle
In 60 teeth that signal panels one enclose, wherein 2 crank teeths are looked for as update tooth (the bent axle half-turn update for carrying out oil spout variable update
Tooth), this 2 crank teeths are separated by half-turn (30 tooth), when being such as chosen at crankshaft signal disk and often turning to the 2nd tooth and 32 tooth, update
Oil spout variable (i.e. oil spout phase and fuel injection pulsewidth).
In engine electric-controlled unit upper layer software (applications) (i.e. application layer software) and lower software (i.e. bottom are equipped with for Injection Control
Layer software).Relationship between application layer software and bottom software as shown in figure 3, application layer software mainly for the treatment of complex logic
It calculates, bottom software is mainly used for driving engine actuators (such as oil spout actuator, i.e. fuel injector).It, should for Injection Control
It can be calculated per bent axle half-turn with layer software and update an oil spout variable such as oil spout phase and fuel injection pulsewidth, and the spray calculated
Oil phase position and fuel injection pulsewidth pass to bottom software；Bottom software is by calling oil spout driving function (to drive hardware effort
Function), the fuel injection pulsewidth and oil spout phasometer passed over using application layer software calculates fuel injection beginning point, further according to the oil spout
Starting point sets microcontroller timer, and triggering fuel injector performs oil spout when the fuel injection beginning point is reached in timer.Here,
Fuel injection pulsewidth, that is, injection duration, with the positive correlations such as the power demand of engine or torque demand；Oil spout phase, that is, oil spout position
It puts, for inferring end of injection point, it is therefore an objective to obtain best oil spout opportunity, make engine combustion best.
Engine Injection Control algorithm is mostly the following two kinds method at present, the first is that bottom software is fixed using one
Crank teeth triggers oil spout driving function, and the fuel injection pulsewidth and oil spout phasometer passed over using application layer software calculates oil spout
Starting point and end of injection point；It is for second using rotating speed discrete method, in the engine speed of different phase, using different songs
Axis tooth triggers oil spout driving function, and the fuel injection pulsewidth and oil spout phasometer passed over using application layer software is calculated oil spout and opened
Initial point and end of injection point.Above two method, fuel injection pulsewidth, oil spout phase and the application layer software meter performed by bottom software
All there are retardances in various degree for the oil spout phase of calculating, fuel injection pulsewidth, influence oil spout closed-loop control, especially idling steady
Control.
Fig. 4 relational graphs between cylinder fuel injection and half-turn update tooth, as seen from Figure 4, application layer software is crankshaft signal
The 2nd tooth and the 32nd tooth of disk as every bent axle half-turn trigger point, to update igniting, oil spout variable.Existing engine Injection Control
Mostly bottom software is using an oil spout driving triggering point mode, and since oil spout phase is a variable quantity, fuel injection beginning point is
It is obtained back by oil spout phase, fuel injection pulsewidth backstepping, as shown in Figure 2.In order to ensure that bottom software oil spout driving trigger point exists
Before fuel injection beginning point, bottom software oil spout driving trigger point is usually selected in maximum fuel injection pulsewidth and maximum spout oil phase position is inverse
Before the fuel injection beginning point pushed back (such as crank teeth of front 2).
It can be seen that with reference to Fig. 2 and Fig. 4, if fuel injection pulsewidth and oil spout phase are sufficiently small, bottom software oil spout driving triggering
Point may be selected in Fig. 4 1. before, 1. arrive 2. between or (being wherein 1. 2. 3. that half-turn updates tooth) between 2. arriving 3..By
It can be calculated in half-turn update tooth in application layer software and update oil spout variable, therefore bottom software oil spout driving trigger point is selected in
Fig. 4 1. before, oil spout variable is interacted between bottom software and application layer software, and (i.e. application layer software is by the oil spout variable of calculating
Be transmitted to bottom software) real-time worst (because will also be subjected to before fuel injection beginning point 1., 2. 3. oil spout variable is more three times
Newly)；It is selected between 1. arriving 2., the real-time that oil spout variable is interacted between bottom software and application layer software is taken second place (because spraying
2. 3. oil spout variable update twice is undergone before oily starting point)；Be selected between 2. arriving 3., bottom software and application layer software it
Between interaction oil spout variable real-time preferably (because only need to undergo a 3. oil spout variable update before fuel injection beginning point).Such as
3. the fuel injection beginning point of fruit Fig. 4 triggers later in half-turn update tooth, then be selected in half-turn update tooth and 3. arrive between fuel injection beginning point, bottom
The real-time of oil spout variable is interacted between layer software and application layer software preferably (because become using last updated oil spout at this time
Amount carries out oil spout driving).
Either a fixed crank teeth is selected still to be triggered using rotating speed discrete method from being analyzed above can be seen that
Oil spout driving function is all difficult to the best real-time that oil spout variable is interacted between bottom software and application layer software.
Invention content
The purpose of the present invention is to provide a kind of engine fuel injection control method, to solve bottom software and application layer software
Between interaction oil spout variable real-time it is poor the problem of.
The embodiment of the present invention provides a kind of engine fuel injection control method, includes the following steps：
Earliest fuel injection beginning point is obtained by maximum fuel injection pulsewidth and maximum spout oil phase position；
Bottom software triggers oil spout driving function so that initial spray is calculated for the first time before the earliest fuel injection beginning point
Oily starting point, and the timing for performing oil spout is set according to the initial fuel injection starting point；
Judge the trigger point of triggering oil spout driving function for the first time to the crankshaft angle difference between the initial fuel injection starting point
In the range of with the presence or absence of have bent axle half-turn update tooth；
If the trigger point of triggering oil spout driving function is to the crankshaft angle difference model between the initial fuel injection starting point for the first time
There are bent axle half-turns in enclosing to update tooth, then selection after the bent axle half-turn update tooth closest to the initial fuel injection starting point and
Before the initial fuel injection starting point, which triggers oil spout driving function and is started so that actual fuel injection is calculated again
Point, and the timing for performing oil spout is reset according to the actual fuel injection starting point.
Further, if the trigger point of triggering oil spout driving function is to the bent axle between the initial fuel injection starting point for the first time
There is no bent axle half-turns in the range of differential seat angle to update tooth, then the timing according to initial fuel injection starting point setting performs oil spout.
Further, which is selected in the falling edge first of the 2nd crank teeth before the earliest fuel injection beginning point
Secondary triggering oil spout driving function.
Further, which is selected at the earliest fuel injection beginning point triggering oil spout driving function for the first time.
Further, the bottom software is in the bent axle half-turn update tooth closest to the initial fuel injection starting point and the initial spray
Between oily starting point, a crank teeth is selected to trigger oil spout driving function again.
The embodiment of the present invention also provides a kind of engine electric-controlled unit, including：
Oil spout variable update module calculates for every bent axle half-turn and updates a fuel injection pulsewidth and oil spout phase, and will
The fuel injection pulsewidth and oil spout phase calculated passes to oil spout driving function trigger module；
Oil spout driving function trigger module for triggering oil spout driving function, is transmitted using the oil spout variable update module
The fuel injection pulsewidth and oil spout phasometer to come over calculates fuel injection beginning point；
Timing setup module, for setting the timing for performing oil spout according to the fuel injection beginning point；
The oil spout driving function trigger module is used in the earliest spray obtained by maximum fuel injection pulsewidth and maximum spout oil phase position
Initial fuel injection starting point is calculated, which is used for triggering oil spout driving function for the first time before oily starting point
The timing for performing oil spout is set according to the initial fuel injection starting point；
The engine electric-controlled unit further includes judgment module, for judging to trigger the trigger point of oil spout driving function for the first time
Whether there is in the range of to the crankshaft angle difference between the initial fuel injection starting point has bent axle half-turn to update tooth；
If judge in the trigger point of first time triggering oil spout driving function to the crank shaft angle between the initial fuel injection starting point
There are bent axle half-turns in the poor range of degree to update tooth, then the oil spout driving function trigger module is used for closest to the initial fuel injection
Oil spout driving function is triggered after the bent axle half-turn update tooth of starting point and again to calculate before the initial fuel injection starting point
Actual fuel injection starting point is obtained, which performs by being reset according to the actual fuel injection starting point based on oil spout
When.
Further, if judging in the trigger point of first time triggering oil spout driving function between the initial fuel injection starting point
Crankshaft angle difference in the range of there is no bent axle half-turn update tooth, then the oil spout driving function trigger module is according to the initial fuel injection
The timing of starting point setting performs oil spout.
Further, which is used for the 2nd crank teeth before the earliest fuel injection beginning point
Falling edge for the first time triggering oil spout driving function.
Further, which is used at the earliest fuel injection beginning point triggering oil spout for the first time
Driving function.
Further, which is used in the bent axle half-turn closest to the initial fuel injection starting point
It updates between tooth and the initial fuel injection starting point, a crank teeth is selected to trigger oil spout driving function again.
Engine fuel injection control method provided in an embodiment of the present invention, bottom software often perform oil spout action, successively
Oil spout driving function is triggered twice.Bottom software performs triggering oil spout driving function for the first time, and the oil spout for calculating general is opened
Initial point which, for the oil spout trigger point of optimal real-time is selected to create conditions below.Second of execution triggering oil spout of bottom software
Driving function, the oil spout variable that application layer software latest computed has been used to come out, makes the fuel injection beginning recalculated point more connect
It is bordering on reality.Engine fuel injection control method provided in an embodiment of the present invention can make the engine oil spout closed-loop control response time
Faster；In idle speed control, engine speed is more stable；Also there is certain optimization function to fuel-economizing, discharge.
Above description is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow the above and other objects, features and advantages of the present invention can
It is clearer and more comprehensible, special below to lift preferred embodiment, and coordinate attached drawing, detailed description are as follows.
Description of the drawings
Fig. 1 a to Fig. 1 d are the schematic diagram of four stroke operation strokes of cylinder.
Fig. 2 is the oil spout sequence diagram of cylinder.
Fig. 3 relational graphs between application layer software and bottom software.
Fig. 4 relational graphs between cylinder fuel injection and half-turn update tooth.
Fig. 5 is the flow chart of engine fuel injection control method in the embodiment of the present invention.
Fig. 6 is the logic chart of engine fuel injection control method in the embodiment of the present invention.
Fig. 7 a one of schematic diagrames between cylinder fuel injection in the embodiment of the present invention and half-turn update tooth.
Fig. 7 b are cylinder fuel injection and half-turn update schematic diagram between tooth in the embodiment of the present invention two.
Fig. 7 c are cylinder fuel injection and half-turn update schematic diagram between tooth in the embodiment of the present invention three.
Fig. 8 is the function structure chart of engine electric-controlled unit in the embodiment of the present invention.
Specific embodiment
The technological means and effect taken further to illustrate the present invention to reach predetermined goal of the invention, below in conjunction with
Attached drawing and preferred embodiment, it is as follows that the present invention is described in detail.
The embodiment of the present invention provides a kind of engine fuel injection control method, to solve between application layer software and bottom software
The real time problems of interaction oil spout variable.It please join Fig. 5, Fig. 6 and Fig. 7 a, which includes the following steps：
S11：Earliest fuel injection beginning point is obtained by maximum fuel injection pulsewidth and maximum spout oil phase position；
For each cylinder, maximum fuel injection pulsewidth and maximum spout oil phase position have been demarcated before engine entrucking
It is good, it is the fixed value that can be demarcated.Therefore, can the earliest fuel injection beginning of cylinder be gone out by maximum fuel injection pulsewidth and maximum spout oil phase position backstepping
Point (is represented) with alphabetical A.
When going out the earliest fuel injection beginning point of cylinder (A points) according to maximum fuel injection pulsewidth and maximum spout oil phase position backstepping, can first it look for
To the tooth of compression stroke top dead centre (after engine production comes out, this point is just fixed up) corresponding crankshaft signal disk of each cylinder
Number, it is assumed that the compression stroke top dead centre correspondence of the 1st cylinder is in the decline of the 15th tooth (designs of some engines) of crankshaft signal disk
At, if four cylinder engine, then be exactly the compression stroke top dead centre of a cylinder often toward 30 crank teeths are pushed forward.Often
After a engine manufacture, the compression stroke top dead centre of each cylinder is all fixed, and regular software is with this point as reference point.
After the completion of induction stroke, the inlet valve of cylinder can close, at this time can be next power cycle carry out oil spout, one
As next secondary intake valve open (induction stroke) before terminate operated fuel injection.Therefore, the earliest fuel injection beginning point (A points) of cylinder
It may be selected at 900 degree before 15 tooth of crankshaft signal disk (before 150 teeth of bent axle), that is, theoretically induction stroke is (normal for cylinder
Engine is advised, per 180 degree i.e. 30 one strokes of tooth) just at end position.It please join Fig. 2, by the 15th tooth institute of crankshaft signal disk
Corresponding compression stroke top dead centre represents (rightmost side of ginseng Fig. 2) with letter U, then can be by 900 degree before 15 tooth of crankshaft signal disk
Corresponding induction stroke lower dead center is set as earliest fuel injection beginning point (the A points of ginseng Fig. 2 leftmost sides).
In figure 7 a, the earliest oil spout obtained according to maximum fuel injection pulsewidth and maximum spout oil phase position is expressed as in figure at A points
Starting point.
S12：Triggering oil spout driving function is first to be calculated for the first time for bottom software before the earliest fuel injection beginning point
Beginning fuel injection beginning point, and the timing for performing oil spout is set according to the initial fuel injection starting point；
Application layer software can calculate per bent axle half-turn and update an oil spout variable such as fuel injection pulsewidth and oil spout phase, and will
The fuel injection pulsewidth and oil spout phase calculated passes to bottom software.(i.e. driving is hard calling oil spout driving function for bottom software
The function of part such as fuel injector work) when, the fuel injection pulsewidth and oil spout phasometer that are passed over using application layer software calculate oil spout
Starting point, and the timer (such as microcontroller timer) of oil spout is arranged for carrying out according to the fuel injection beginning point, in timer
When reaching the fuel injection beginning point, fuel injector starts to perform oil spout.That is, bottom software triggers oil spout driving function, just
It is the fuel injection pulsewidth and oil spout phase for calculating and passing over using application layer software, calculates fuel injection beginning point and and then set
Timing, the fuel injector commencement of fuel injection when timing reaches the fuel injection beginning point.
Bottom software triggers oil spout driving function for the first time before the earliest fuel injection beginning point (A points), may be selected in A points
The falling edge (being represented with letter b) of the crank teeth of front the 2nd triggers oil spout driving function for the first time, can also be selected at A points
Triggering oil spout driving function for the first time, i.e., be included in " before the earliest fuel injection beginning point " before A points and two kinds at A points
Meaning.
In the present invention, bottom software performs the driving letter of triggering oil spout for the first time before the earliest fuel injection beginning point (A points)
Number, its purpose is to calculate general fuel injection beginning point at which to get to the initial fuel injection starting point (C in such as Fig. 7 a
Point), the driving function trigger point to select optimal real-time creates conditions.
In the present embodiment, if fuel injection beginning point (A points) is selected at 900 degree before 15 tooth of crankshaft signal disk earliest, bottom
The fuel injection pulsewidth and oil spout phase that software connected applications layer software passes over, can when first time triggering oil spout driving function
The initial fuel injection starting point (C points) calculated by following formula：
- Up_Infall_Phasic-Inject_Phasic-the Inject_Pulse of fuel injection beginning angle points=900；
Wherein Up_Infall_Phasic be compression stroke top dead centre to inlet valve close between phase (this is quantitative),
Inject_Phasic is oil spout phase, and Inject_Pulse is fuel injection pulsewidth, as shown in Figure 2.
Since fuel injection pulsewidth and oil spout phase can not possibly all be always maximum value, if the fuel injection pulsewidth of cylinder is smaller (such as
Shown in Fig. 7 a), bottom software before the earliest fuel injection beginning point (A points) drive for the first time by triggering oil spout driving function, then oil spout
The first time trigger point (B points in figure) of dynamic function may also have a distance from initial fuel injection starting point (C points in figure), in this section
In distance, it is likely that there are half-turn update tooth (update that can undergo oil spout variable), if undergone between B points and C points
The data update of fuel injection pulsewidth and oil spout phase, then bottom software be calculated initially in first time triggering oil spout driving function
During fuel injection beginning point (C points), the fuel injection pulsewidth and oil spout phase data that are utilized are not newest.Therefore, if at this most
Bottom software triggering oil spout driving function before early fuel injection beginning point (A points), and the initial fuel injection starting point (C to be calculated
Point) perform oil spout, then the real-time for performing oil spout instruction is poor.
S13：Judge the trigger point of triggering oil spout driving function for the first time to the crank shaft angle between the initial fuel injection starting point
Whether there is in the poor range of degree has bent axle half-turn to update tooth；
As shown in Figure 7a, check the trigger point (B points in figure) of bottom software triggering oil spout driving function for the first time to initial
In the range of crankshaft angle difference between fuel injection beginning point (C points in figure), either with or without bent axle half-turn update tooth inside.If in B points
Between C points there are bent axle half-turn update tooth, then show this section of fuel injection pulsewidth and oil spout phase between B points and C points away from
Update is lived through from interior；If there is no bent axle half-turn to update tooth between B points and C points, show fuel injection pulsewidth and oil spout phase in B
Update is not undergone in this segment distance between point and C points.Therefore judge in the range of crankshaft angle difference between B points and C points whether
There are bent axle half-turns to update tooth, that is, judge whether oil spout variable (fuel injection pulsewidth and oil spout phase) passes through during the period
Went through update.
S14：If the trigger point of triggering oil spout driving function is to the crankshaft angles between the initial fuel injection starting point for the first time
There are bent axle half-turns in poor range to update tooth, then selection the bent axle half-turn update tooth closest to the initial fuel injection starting point it
Afterwards and before the initial fuel injection starting point, which triggers oil spout driving function and is opened so that actual fuel injection is calculated again
Initial point, and the timing for performing oil spout is reset according to the actual fuel injection starting point.
If at oil spout driving function first time trigger point (B points) to the crankshaft angles between initial fuel injection starting point (C points)
There are bent axle half-turns in poor range to update tooth, as Fig. 7 a illustrate to update in the presence of there are two bent axle half-turns between B points and C points
1. 2., then selection is after 2. the bent axle half-turn closest to initial fuel injection starting point (C points) updates tooth to tooth, and is opened in initial fuel injection
Before initial point (C points), such as in bent axle half-turn update tooth 2. between initial fuel injection starting point (C points), bottom software selection one
(i.e. second) triggers oil spout driving function to a crank teeth again, and bottom software can obtain application layer software latest computed at this time
Oil spout variable (fuel injection pulsewidth and oil spout phase), interacts the real-time of oil spout variable most between bottom software and application layer software
It is good.That is, the oil spouts such as fuel injection pulsewidth variable is at oil spout driving function first time trigger point (B points) to initial fuel injection starting point
Update is experienced between (C points), as shown in Figure 7a, illustrates to become in the oil spout twice of two bent axle half-turn update teeth of experience 1. 2.
After amount update, fuel injection pulsewidth is updated to as shown in solid in figure shown in dotted line in figure.By selecting to open closest to initial fuel injection
2. second of triggering oil spout driving function, bottom software are newest using application layer software later for the half-turn update tooth of initial point (C points)
The fuel injection pulsewidth and oil spout phase of calculating, which recalculate, obtains actual fuel injection starting point (C ' points in figure), and recalculates and obtain
Actual fuel injection starting point (C ' points) be closest to it is practical, therefore in the half-turn closest to initial fuel injection starting point (C points) more
New tooth 2. after triggering oil spout driving function, can obtain interacted between bottom software and application layer software oil spout variable it is best when
Machine solves the real time problems that oil spout variable is interacted between bottom software and application layer software.
It is appreciated that the actual fuel injection starting point (C ' that second of triggering oil spout driving function of bottom software recalculates
Point) with the initial fuel injection starting point (C points) that calculates of triggering oil spout driving function of above-mentioned first time generally differ not too large.Bottom
After layer software recalculates and obtains actual fuel injection starting point (C ' points), will again it be set according to the actual fuel injection starting point (C ' points)
Timer (being equivalent to the timing for covering and being set during above-mentioned first time triggering oil spout driving function at this time) is put, being reached in timing should
During actual fuel injection starting point (C ' points), fuel injector starts to perform oil spout, therefore the real-time for performing oil spout instruction is preferable.
As shown in Figure 7b, if at oil spout driving function first time trigger point (B points) between initial fuel injection starting point (C points)
There is only a bent axle half-turn update tooth 1., then it selects after 1. bent axle half-turn updates tooth, and in initial fuel injection starting point (C
Point) before, such as in bent axle half-turn update tooth 1. between initial fuel injection starting point (C points), bottom software selects a bent axle
(i.e. second) triggers oil spout driving function to tooth again, and bottom software can obtain the newest oil spout variable of application layer software at this time,
The real-time that oil spout variable is interacted between bottom software and application layer software is best.Bottom software is in second of triggering oil spout driving
During function, actual fuel injection starting point can be redefined (in figure using the newest oil spout variable passed over of application layer software
C ' points), and oil spout timing is reset according to the actual fuel injection starting point (C ' points), treat that timing reaches the actual fuel injection starting point
(C ' points) fuel injector starts to perform oil spout afterwards.
As shown in Figure 7 c, if at oil spout driving function first time trigger point (B points) between initial fuel injection starting point (C points)
Crankshaft angle difference in the range of there is no bent axle half-turn update tooth (i.e. oil spout variable does not update in this segment limit), then foundation bottom
The oil spout timing set by initial fuel injection starting point (C points) that layer software is calculated when first time triggering oil spout driving function is held
Row oil spout, at this time initial fuel injection starting point that is, actual fuel injection starting point.
In the above-described embodiments, it is illustrated with the Injection Control of one of cylinder of engine, for multi-cylinder
Engine, the Injection Control of remaining cylinder are referred to above-mentioned progress, and this will not be repeated here.
As shown in figure 8, the embodiment of the present invention also provides a kind of engine electric-controlled unit, including：
Oil spout variable update module calculates for every bent axle half-turn and updates a fuel injection pulsewidth and oil spout phase, and will
The fuel injection pulsewidth and oil spout phase calculated passes to oil spout driving function trigger module；
Oil spout driving function trigger module for triggering oil spout driving function, is transmitted using the oil spout variable update module
The fuel injection pulsewidth and oil spout phasometer to come over calculates fuel injection beginning point；
Timing setup module, for setting the timing for performing oil spout according to the fuel injection beginning point；
The oil spout driving function trigger module is used in the earliest spray obtained by maximum fuel injection pulsewidth and maximum spout oil phase position
Initial fuel injection starting point is calculated, which is used for triggering oil spout driving function for the first time before oily starting point
The timing for performing oil spout is set according to the initial fuel injection starting point；
The engine electric-controlled unit further includes judgment module, for judging to trigger the trigger point of oil spout driving function for the first time
Whether there is in the range of to the crankshaft angle difference between the initial fuel injection starting point has bent axle half-turn to update tooth；
If judge in the trigger point of first time triggering oil spout driving function to the crank shaft angle between the initial fuel injection starting point
There are bent axle half-turns in the poor range of degree to update tooth, then the oil spout driving function trigger module is used for closest to the initial fuel injection
Oil spout driving function is triggered after the bent axle half-turn update tooth of starting point and again to calculate before the initial fuel injection starting point
Actual fuel injection starting point is obtained, which performs by being reset according to the actual fuel injection starting point based on oil spout
When.
Further, if judging in the trigger point of first time triggering oil spout driving function between the initial fuel injection starting point
Crankshaft angle difference in the range of there is no bent axle half-turn update tooth, then the oil spout driving function trigger module is according to the initial fuel injection
The timing of starting point setting performs oil spout.
Further, which is used for the 2nd crank teeth before the earliest fuel injection beginning point
Falling edge for the first time triggering oil spout driving function.
Further, which is used at the earliest fuel injection beginning point triggering oil spout for the first time
Driving function.
Further, which is used in the bent axle half-turn closest to the initial fuel injection starting point
It updates between tooth and the initial fuel injection starting point, a crank teeth is selected to trigger oil spout driving function again.
About the engine electric-controlled unit of the present embodiment, belong to same with the embodiment of above-mentioned engine fuel injection control method
Design, therefore more contents of the engine electric-controlled unit, referring also to above method embodiment, details are not described herein.
Engine fuel injection control method provided in an embodiment of the present invention, bottom software often perform oil spout action, successively
Oil spout driving function is triggered twice.Bottom software performs triggering oil spout driving function for the first time, and the oil spout for calculating general is opened
Initial point which, for the oil spout trigger point of optimal real-time is selected to create conditions below.Second of execution triggering oil spout of bottom software
Driving function, the oil spout variable that application layer software latest computed has been used to come out, makes the fuel injection beginning recalculated point more connect
It is bordering on reality.Engine fuel injection control method provided in an embodiment of the present invention can make the engine oil spout closed-loop control response time
Faster；In idle speed control, engine speed is more stable；Also there is certain optimization function to fuel-economizing, discharge.
One of ordinary skill in the art will appreciate that hardware can be passed through by realizing all or part of step of above-described embodiment
It completes, relevant hardware can also be instructed to complete by program, the program can be stored in computer-readable storage
In medium, storage medium mentioned above can be read-only memory, disk or CD etc..
The above described is only a preferred embodiment of the present invention, not make limitation in any form to the present invention, though
So the present invention is disclosed above with preferred embodiment, however is not limited to the present invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, as long as being without departing from technical solution of the present invention content, technical spirit pair according to the present invention
Any simple modification, equivalent change and modification that above example is made, in the range of still falling within technical solution of the present invention.
Claims (10)
1. a kind of engine fuel injection control method, which is characterized in that include the following steps：
Earliest fuel injection beginning point is obtained by maximum fuel injection pulsewidth and maximum spout oil phase position；
Bottom software for the first time with initial fuel injection is calculated opened by triggering oil spout driving function before the earliest fuel injection beginning point
Initial point, and the timing for performing oil spout is set according to the initial fuel injection starting point；
Judge the trigger point of triggering oil spout driving function for the first time to the crankshaft angle difference range between the initial fuel injection starting point
Interior whether there is has bent axle half-turn to update tooth；
If for the first time in the range of the trigger point to the crankshaft angle difference between the initial fuel injection starting point of triggering oil spout driving function
There are bent axle half-turns to update tooth, then selection is after the bent axle half-turn update tooth closest to the initial fuel injection starting point and at this
Before initial fuel injection starting point, which triggers oil spout driving function so that actual fuel injection starting point is calculated again, and
The timing for performing oil spout is reset according to the actual fuel injection starting point.
2. engine fuel injection control method as described in claim 1, it is characterised in that：If triggering oil spout driving function for the first time
Trigger point to the crankshaft angle difference between the initial fuel injection starting point in the range of there is no bent axle half-turn update tooth, then according to should
The timing of initial fuel injection starting point setting performs oil spout.
3. engine fuel injection control method as described in claim 1, it is characterised in that：The bottom software is selected in the earliest oil spout
The falling edge of the 2nd crank teeth triggers oil spout driving function for the first time before starting point.
4. engine fuel injection control method as described in claim 1, it is characterised in that：The bottom software is selected in the earliest oil spout
Starting point triggers oil spout driving function for the first time.
5. engine fuel injection control method as described in claim 1, it is characterised in that：The bottom software is initial closest to this
Between the bent axle half-turn update tooth of fuel injection beginning point and the initial fuel injection starting point, a crank teeth is selected to trigger oil spout drive again
Dynamic function.
6. a kind of engine electric-controlled unit, including：
Oil spout variable update module often rotates half-turn for bent axle and calculates and update a fuel injection pulsewidth and oil spout phase, and will
The fuel injection pulsewidth and oil spout phase calculated passes to oil spout driving function trigger module；
Oil spout driving function trigger module for triggering oil spout driving function, is passed over using the oil spout variable update module
Fuel injection pulsewidth and oil spout phasometer calculate fuel injection beginning point；
Timing setup module, for setting the timing for performing oil spout according to the fuel injection beginning point；
It is characterized in that：
The oil spout driving function trigger module is used to open in the earliest oil spout obtained by maximum fuel injection pulsewidth and maximum spout oil phase position
For triggering oil spout driving function initial fuel injection starting point is calculated, which is used for basis for the first time before initial point
Initial fuel injection starting point setting performs the timing of oil spout；
The engine electric-controlled unit further includes judgment module, for judge for the first time triggering oil spout driving function trigger point arrive this
Whether there is in the range of crankshaft angle difference between initial fuel injection starting point has bent axle half-turn to update tooth；
If judge in the trigger point of first time triggering oil spout driving function to the crankshaft angle difference between the initial fuel injection starting point
In the range of there are bent axle half-turns to update tooth, then the oil spout driving function trigger module closest to the initial fuel injection for starting
Oil spout driving function is triggered after the bent axle half-turn update tooth of point and again to be calculated before the initial fuel injection starting point
Actual fuel injection starting point, the timing setup module are used to reset the timing for performing oil spout according to the actual fuel injection starting point.
7. engine electric-controlled unit as claimed in claim 6, it is characterised in that：If judge in first time triggering oil spout driving letter
There is no bent axle half-turns in the range of several trigger point to the crankshaft angle difference between the initial fuel injection starting point to update tooth, the then spray
Oily driving function trigger module performs oil spout according to the timing that the initial fuel injection starting point is set.
8. engine electric-controlled unit as claimed in claim 6, it is characterised in that：The oil spout driving function trigger module is used for
The falling edge of the 2nd crank teeth triggers oil spout driving function for the first time before the earliest fuel injection beginning point.
9. engine electric-controlled unit as claimed in claim 6, it is characterised in that：The oil spout driving function trigger module is used for
Oil spout driving function is triggered at the earliest fuel injection beginning point for the first time.
10. engine electric-controlled unit as claimed in claim 6, it is characterised in that：The oil spout driving function trigger module is used for
It is updated between tooth and the initial fuel injection starting point in the bent axle half-turn closest to the initial fuel injection starting point, selects a crank teeth
Oil spout driving function is triggered again.
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| CN111622855A (en) * | 2020-06-09 | 2020-09-04 | 中国第一汽车股份有限公司 | Control method for fuel injection of direct injection engine |
| CN113482788A (en) * | 2021-07-30 | 2021-10-08 | 青驭汽车科技(太仓)有限公司 | Engine fuel multiple injection control method |
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| JP2013213445A (en) * | 2012-04-02 | 2013-10-17 | Suzuki Motor Corp | Engine fuel injection device |
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| EP1854988A2 (en) * | 2006-05-10 | 2007-11-14 | Denso Corporation | Controller of internal combustion engine |
| CN101182816A (en) * | 2006-11-14 | 2008-05-21 | 株式会社电装 | Fuel injection device and adjustment method thereof |
| EP2085597A1 (en) * | 2006-11-20 | 2009-08-05 | Kabushiki Kaisha Toyoda Jidoshokki | Fuel injection control device for internal combustion engine |
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