CN109751145A - Method for controlling fuel injector - Google Patents
Method for controlling fuel injector Download PDFInfo
- Publication number
- CN109751145A CN109751145A CN201811301338.5A CN201811301338A CN109751145A CN 109751145 A CN109751145 A CN 109751145A CN 201811301338 A CN201811301338 A CN 201811301338A CN 109751145 A CN109751145 A CN 109751145A
- Authority
- CN
- China
- Prior art keywords
- fuel injector
- operational mode
- pressure
- manipulation
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
- F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
- F02D41/3872—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves characterised by leakage flow in injectors
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
-
- 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
Abstract
The present invention relates to a kind of methods for controlling the fuel injector of the common rail system of internal combustion engine.The fuel injector is run in a manner of without free penetrate in the first operational mode (B1).In the second operational mode (B2), sky at least once is all carried out before each fuel injection of fuel injector and is penetrated.As the required manipulation duration (t of fuel injectora) in previously given manipulation duration ranges, and the rail pressure (p of common rail systemR) it is more than first pressure threshold value (pR1) when, the fuel injector is switched in second operational mode (B2).
Description
Technical field
The present invention relates to a kind of methods for controlling the fuel injector of common rail system.In addition, the present invention relates to one kind
Computer program, the computer program are arranged for executing each step according to the method for the present invention and a kind of machine
Readable storage medium is stored with computer program according to the present invention on it.Finally, the present invention relates to a kind of electronic controls
Equipment is arranged to control fuel injector by means of this method.
Background technique
Common rail system has the fuel injector directly sprayed for carrying out fuel in internal combustion engine.These fuel injectors
It is designed as magnet valve injector.In order to adjust its magnetic armature stroke, magnet valve injector has many components.Rail in common rail as a result,
Road pressure and the temperature of fuel injector generate large effect to actual armature travel.The influence must adjust specified rank
(vorgehalten) is maintained as the safe spacing with A seating throttling boundary (Sitzdrosselgrenze) when iron stroke.This
And closure sustained wave (the Schlie dauerwelle) for causing to increase under medium and higher rail pressure adversely
Act on ejector function.The working life of fuel injector is also shortened as a result,.
In order to reduce the amplitude of closure sustained wave, high stream can be set on valve seat during the opening stage of switch valve
Dynamic speed.By reduce seat diameter, by reduce armature travel, by increase A- throttle it is through-flow or by reduce switch valve
Opening speed, the flowing velocity on valve seat can be increased.Opening speed is especially by the valve spring force of fuel injector and magnetic force
It influences.
Summary of the invention
For control common rail system fuel injector method regulation, the common rail system in the first operational mode with
It is run without the free mode penetrated.In the second operational mode, carried out at least before each fuel injection of fuel injector
Primary sky is penetrated.Here, empty penetrate refers to and manipulates fuel injector with so short manipulation duration, although so that its switch valve
In the reflux portion for the high pressure accumulator injection equipment that opening and fuel are flowed into common rail system, however the nozzle of fuel injector
Needle remains closed and thus there is no the injections in the cylinder body of fuel to internal combustion engine.Fuel injector is executing the empty feelings penetrated
Operation under condition is in the prior art in regulator system it is known that initiatively reduce in the high pressure accumulator of common rail system
Pressure, i.e. rail pressure.It is this that the method for common rail system is run for example in 199 17 711 C2 of DE with air shot mode
It is known.Here, rail pressure is reduced in the inertia operation of internal combustion engine, to therefore give needle for the metering unit of common rail system
The performance space that rail pressure is adjusted.Here, the empty manipulation duration penetrated so is selected, so that on the one hand passing through switch valve
It is hit in each sky and fuel quantity as big as possible is maneuvered into reflux portion, and on the other hand make fuel injector
Pressure in control room (Steurraum) is sufficiently high within the selected manipulation duration, so that nozzle needle is not transported
It is dynamic.
In the method, the sky of fuel injector penetrates manipulation for directly pre-processing before measuring relevant switch valve manipulation
The switch valve of fuel injector and reflux portion.This is carried out in the second operational mode, when the required manipulation of fuel injector
Duration is in previously given manipulation duration ranges, and when the rail pressure of common rail system is extraly more than the
When one pressure threshold, fuel injector is then switched in second operational mode.Sky penetrates manipulation in fuel injection as a result,
It is carried out in the relevant range of operation of formation for closure sustained wave of device.Then can directly before measuring relevant manipulation
Higher steam share is realized in the low pressure range of fuel injector.This influences the velocity of sound for being closed sustained wave in low pressure range,
And lead to the phase shift of the sustained wave of reflection.The reduction of pressure magnitude is adjoint and arrive as a result,.
It is particularly critical within the scope of intermediate and top rail pressure to be closed sustained wave, therefore the should be switched to herein
In two operational modes.Although the lower limit of the rail pressure range is provided by first pressure threshold value, it is preferred that can also be into one
Step regulation, the upper limit are limited by second pressure threshold value.Then, only when rail pressure is lower than second pressure threshold value, fuel injection
Device is just switched in the second operational mode.First pressure threshold value is preferably at least 70 MPa, and particularly preferably at least 80
MPa.Second pressure threshold value preferably at most 230 MPa, particularly preferably at most 220 MPa, and completely particularly preferably at most 200
MPa。
In addition, the characteristic of closure sustained wave is determined by manipulation duration of the fuel injector in fuel injection.Therefore,
The condition being switched in the second operational mode is that the manipulation duration of required fuel injector is in previously given behaviour
In vertical duration ranges.This can be limited by lower-pilot duration threshold and upper manipulation duration threshold.Here,
Lower-pilot duration threshold is preferably at least 120 μ s and upper manipulation duration threshold preferably up to 350 μ s, with
Manipulation is penetrated using sky in the range of operation especially relevant with closure sustained wave of fuel injector.
In order to realize the optimal pretreatment of switch valve and reflux portion, it is preferred that in the second operational mode, sky penetrate and
The time interval between fuel injection followed by is at least 180 μ s, especially preferably at least 220 μ s.It is then preferred that
It is that time interval is up to 350 μ s.
On the one hand, in order to realize good pretreatment, and on the other hand, in order to ensure nozzle does not occur during sky is penetrated
The opening of needle, the manipulation duration that sky is penetrated are preferably in the range of 110 to 115 μ s.
Computer program is set to execute each step of this method, especially when it sets in electronic computing device or control
When standby upper operation.For this purpose, the computer program is stored on machine readable storage medium.By the way that computer program is answered
For traditional control electronics, such control electronics are obtained, which is arranged to by means of this
Method controls the fuel injector of common rail system.
Detailed description of the invention
The embodiment of the present invention is shown in the accompanying drawings and is further elaborated in the following description.
Fig. 1 shows the segment of the fuel injector with switch valve with viewgraph of cross-section, which can borrow
Help the method for embodiment according to the present invention to control.
Fig. 2 shows the flow charts of the method for embodiment according to the present invention.
Fig. 3 shows the electric current of the fuel injector in the embodiment of the present invention, armature travel, valve cup pressure
(Ventilnapfdruck) and armature chamber pressure curve in time.
Electric current, injection and the armature travel that Fig. 4 shows the fuel injector in the embodiment of the present invention with curve exist
Temporal curve.
Specific embodiment
Control valve that can be Electromagnetically actuated shown in Fig. 1 is used to control the fuel injector in common rail fuel injection system
The lifting motion (Hubbewegung) of nozzle needle 1.For this purpose, control valve includes valve closure member 2, the valve closure member is logical
Cross valve member 4(Ventilst ü ck) hollow cylindrical protrusion 3(Ansatz) axially moveably guide.Valve member 4 is in hollow circle
Valve seat 5 is formed in cylindrical protrusion 3, valve closure member 2 is axially pre-tensioner relative to the valve seat by means of spring 6.
It is powered to open the control valve to magnetic coil 7, to construct magnetic field, and makes the magneticaction in magnetic field to rank
On iron, which passes through the formation of section 8 of the plate of valve closure member 2 here.Magnetic force makes valve closure member 2 overcome spring 6
Spring force, move upwards towards the side of magnetic core 9 for surrounding magnetic coil 7, and formed and stopped for the stroke of valve closure member 2
Gear.If opening control valve, the connection of the valve chamber 11 of control room 10 and annular is formed, the valve chamber of the annular is arranged in valve member
In the protrusion 3 of 4 hollow cylindrical.The connection passes through outflow throttle 12(Ablaufdrossel) guidance, the outflow throttle
Also it is constructed like that with the control room 10 in valve member 4.The control pressure being present in control room 10 reduces and can open nozzle
Needle 1, the control pressure load nozzle needle 1 on closing direction.Valve cup 13 is formed by the downside of valve chamber 11.
The fuel flowed out in valve chamber 11 from control room 10 must further be discharged.Protrusion 3 of the valve member 4 in hollow cylindrical
In there is radial hole 14, the radial hole forms the lasting connection of valve chamber 11 and low-pressure chamber 15.
In order to which nozzle needle 1 is put back into its seat, it is necessary to increase the control pressure in control room 10 again.For this purpose,
The energization for stopping magnetic coil 7, sets in its initial position, and be closed control valve so that spring 6 returns valve closure member 2.
Reflux plug 16 with circular earrings (Ohrring) 17 is arranged in above spring 6 in flow pass 18.
Sustained wave is generated during the opening procedure of switch valve, the sustained wave is on reflux plug 16 partly in reflection position
It sets and is reflected on 19.During the opening procedure of switch valve, Steam area is generated simultaneously in valve cup.When the sustained wave reflected shows
When reaching valve cup, steam bubble is collapsed.Here, generating pressure peak, which can significantly slow down valve closure.In 80 MPa
To the rail pressure of 200 MPa, the safe spacing away from A seating throttling boundary in warm-up (Warmbetrieb) is
It is so high, enable in the case where low flowing velocity that there is no stable steam domes to occur on valve seat.
When requiring the valve of fuel injector to open in control electronics (not shown) in the first processing step SO1
When, it is checked in step S02, manipulates duration of Δ taWhether in such as lower-pilot duration threshold of 150 μ s here
Δta1Here the upper manipulation duration threshold Δ t of such as 300 μ sa2Between manipulation duration ranges in.This point
It is shown in FIG. 2.If meeting the condition, checked in another step S03, by means of unshowned common rail pressure sensor
The rail pressure p of measurementRWhether the first pressure threshold value p of here such as 80 MPas is located atR1On and be located at here such as 200
The second pressure threshold value p of MPaR2Under.The pressure threshold pR1、pR2Across the centre of fuel injector and top track
Pressure limit, but the rail pressure range is located under the typical system pressure of the common rail system of 250 MPa.
As soon as being unsatisfactory for as long as having in the condition inquired in step S02 and S03, fuel injector is with the first operation mould
Formula B1 operation.In the first operational mode B1, being wanted for the fuel injector for injecting fuel into internal combustion engine only occurs
The manipulation asked.On the contrary, fuel injector is switched in the second operational mode B2 if all conditions all meet.This second
In operational mode, sky is carried out before each fuel injection and is penetrated.Sky is penetrated herein for example correspondingly in required fuel injection
260 μ s before with the sky of 112 μ s penetrate manipulation the duration carry out.
In Fig. 3, with dotted line phase with continuous solid line and in the second moving model B2 in the first operational mode B1
It shows with answering: the pressure p on the stroke H of electric current I, armature on magnetic coil 18, valve cupVAnd the pressure p in armature chamberA's
Curve about time t.Here, meeting the condition of method and step S02 and S03.In the method according to the invention, fuel injection
Therefore device is run in the second operating mode, and it is will remain in conventional methods where in first and individual operational mode.?
In first operational mode, the individual rising of electric current I can be only considered.The electric current increases to referred to as starting current first
(Bootstrom) maximum value.Hereafter, the current reduction to acceleration electric current (Anzugsstrom) is then reduced to first
Keep electric current.This leads to temporarily constant armature travel H, the fuel spray thus opening nozzle needle 19 and occurring into internal combustion engine
It penetrates.Here, forming apparent closure sustained wave, which can pass through valve cup pressure pVWith armature chamber's pressure pAMost
Reach value greatly to identify.On the contrary, in the second operational mode, before the main manipulation of fuel injector, using for main manipulation
The identical starting current used carries out another of short duration energization.Followed by the starting being obviously shortened relative to the main manipulation
Stage, and the holding stage being equally obviously shortened, so that slight promotion and then armature return immediately only occur.This
One armature travel already leads to the rising of the pressure in valve cup and armature chamber.As can be seen that by it is this pretreatment so that valve cup and
Pressure decline in armature chamber up to, and therefore reduce closure sustained wave.
Respectively illustrated in Fig. 4 in the first operational mode B1(solid line) and the second operational mode B2(dotted line) in fuel spray
The result of the instantaneous measurement of the manipulation of emitter.It is same as shown in Figure 3, it can also be seen that armature travel H is in the second fortune in Fig. 4
Decline earlier in row Mode B 2 relative to the first operational mode B1, and the faster closure of nozzle needle 19 therefore occurs.This
It is determined by distant closure sustained wave.By closed-nozzle needle 19 earlier, under the injection rate E of fuel injector
Drop, and sustained wave is closed more strongly close to desired value, just as that may go out under the influence of strong closure sustained wave
As existing.Here, sky is penetrated to amount balance also without negative impact, because empty penetrate manipulates perimeter strip only mentioned above
It is directly carried out before desired main injection under the precondition of part.
Claims (10)
1. the method for the fuel injector of the common rail system for controlling internal combustion engine, the fuel injector is in the first operational mode
(B1) it is run in a manner of without free penetrate in, which is characterized in that when the required manipulation of the fuel injector continues
Between (ta) in previously given manipulation duration ranges, and the rail pressure (p of the common rail systemR) more than
One pressure threshold (pR1) when, the fuel injector is switched in the second operational mode (B2), in second operational mode,
Sky at least once is all carried out before each fuel injection of the fuel injector to penetrate.
2. the method according to claim 1, wherein the first pressure threshold value (pR1) it is at least 70 MPa.
3. method according to claim 1 or 2, which is characterized in that only as the rail pressure (PR) it is in second pressure
Threshold value (PR2) under when, the fuel injector is then just switched in the second operational mode (B2).
4. according to the method described in claim 3, it is characterized in that, the second pressure threshold value (pR2) it is at most 230 MPa.
5. method according to claim 1 to 4, which is characterized in that the manipulation duration ranges pass through
At least lower-pilot duration threshold (t of 120 μ sa1) and the upper manipulation duration threshold by being at most 350 μ s
It is worth (ta2) limitation.
6. the method according to any one of claims 1 to 5, which is characterized in that in second operational mode (B2)
In, the time interval penetrated between fuel injection followed by the sky is at least 180 μ s.
7. method according to any one of claim 1 to 6, which is characterized in that in second operational mode (B2)
In, the time interval penetrated between fuel injection followed by the sky is at most 350 μ s.
8. a kind of computer program is arranged to execute each step of method according to any one of claim 1 to 7
Suddenly.
9. a kind of machine readable storage medium, is stored with computer program according to claim 8 on it.
10. a kind of control electronics are arranged to be come by means of method according to any one of claim 1 to 7
Control the fuel injector of common rail system.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017219568.1A DE102017219568A1 (en) | 2017-11-03 | 2017-11-03 | Method for controlling a fuel injector |
| DE102017219568.1 | 2017-11-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109751145A true CN109751145A (en) | 2019-05-14 |
Family
ID=66179274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811301338.5A Pending CN109751145A (en) | 2017-11-03 | 2018-11-02 | Method for controlling fuel injector |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109751145A (en) |
| DE (1) | DE102017219568A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111520247A (en) * | 2020-03-25 | 2020-08-11 | 吉利汽车研究院（宁波）有限公司 | Method and system for determining air-fuel ratio based on injection pulse width of oil injector |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1661221A (en) * | 2004-02-27 | 2005-08-31 | 日产自动车株式会社 | Engine fuel injection control device |
| JP2011007203A (en) * | 2010-10-13 | 2011-01-13 | Denso Corp | Fuel injection state detector |
| CN103097712A (en) * | 2010-09-14 | 2013-05-08 | 罗伯特·博世有限公司 | Method for operating an injection system |
| CN104454207A (en) * | 2013-09-13 | 2015-03-25 | 福特环球技术公司 | Method for controlling fuel injection and fuel injection system |
| JP2015212536A (en) * | 2014-05-07 | 2015-11-26 | 株式会社デンソー | Fuel injection control device and control method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19917711C2 (en) | 1999-04-20 | 2001-06-07 | Bosch Gmbh Robert | Method and device for controlling an internal combustion engine |
-
2017
- 2017-11-03 DE DE102017219568.1A patent/DE102017219568A1/en not_active Withdrawn
-
2018
- 2018-11-02 CN CN201811301338.5A patent/CN109751145A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1661221A (en) * | 2004-02-27 | 2005-08-31 | 日产自动车株式会社 | Engine fuel injection control device |
| CN103097712A (en) * | 2010-09-14 | 2013-05-08 | 罗伯特·博世有限公司 | Method for operating an injection system |
| JP2011007203A (en) * | 2010-10-13 | 2011-01-13 | Denso Corp | Fuel injection state detector |
| CN104454207A (en) * | 2013-09-13 | 2015-03-25 | 福特环球技术公司 | Method for controlling fuel injection and fuel injection system |
| JP2015212536A (en) * | 2014-05-07 | 2015-11-26 | 株式会社デンソー | Fuel injection control device and control method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111520247A (en) * | 2020-03-25 | 2020-08-11 | 吉利汽车研究院（宁波）有限公司 | Method and system for determining air-fuel ratio based on injection pulse width of oil injector |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102017219568A1 (en) | 2019-05-09 |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190514 |
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| WD01 | Invention patent application deemed withdrawn after publication |