CN1629471A - Fuel jetting device used in internal combustion engine - Google Patents
Fuel jetting device used in internal combustion engine Download PDFInfo
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- CN1629471A CN1629471A CN 200410082043 CN200410082043A CN1629471A CN 1629471 A CN1629471 A CN 1629471A CN 200410082043 CN200410082043 CN 200410082043 CN 200410082043 A CN200410082043 A CN 200410082043A CN 1629471 A CN1629471 A CN 1629471A
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- 239000000446 fuel Substances 0.000 title claims abstract description 86
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 25
- 238000002347 injection Methods 0.000 claims abstract description 140
- 239000007924 injection Substances 0.000 claims abstract description 140
- 230000005611 electricity Effects 0.000 claims description 4
- 238000010304 firing Methods 0.000 description 10
- 239000007921 spray Substances 0.000 description 10
- 238000007789 sealing Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M57/00—Fuel-injectors combined or associated with other devices
- F02M57/02—Injectors structurally combined with fuel-injection pumps
- F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
- F02M57/023—Injectors structurally combined with fuel-injection pumps characterised by the pump drive mechanical
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
- F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
- F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
- F02M45/08—Injectors peculiar thereto
- F02M45/086—Having more than one injection-valve controlling discharge orifices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/24—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
- F02M59/26—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders
- F02M59/265—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders characterised by the arrangement or form of spill port of spill contour on the piston
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/46—Valves, e.g. injectors, with concentric valve bodies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
A fuel injection device for a combustion engine comprises a fuel high pressure pump and a fuel injection valve connected with the pump in each air cylinder. The fuel high pressure pump has a pump piston drived by a combustion engine which defines a pump working chamber connected with the fuel injection valve pressure chamber. The pump working chamber and a unloading area are connected through an electrically operated control valve. The fuel injection valve has a first injection valve component and a second injection valve component movably arranged in the first injection valve component. The connection of the control chamber and the pump working chamber is opened when the pump piston is in a small stroke and closed when the pump piston is in a big stroke. An one-way valve is arranged in the connection, which is opened towards the control chamber. The control valve is closed in some time when the pump piston is in a small stroke so as to supply the increased pressure to the control area and lead the second injection valve maintained in the closing position.
Description
Technical field
The present invention relates to a kind of fuel injection system that is used for internal-combustion engine.
Background technique
Such fuel injection system is disclosed by DE 101 62 384 A1.This fuel injection system is that each cylinder of internal-combustion engine all has a high-pressure fuel pump and a connected Fuelinjection nozzle.High-pressure fuel pump has a pump piston that is driven by internal-combustion engine in stroke motion, pump piston defines the pump work chamber that is connected with the pressure chamber of Fuelinjection nozzle in a cylinder hole.Be provided with the control valve of an electricity operation, by being connected of this valve control pump active chamber and off-load zone.Fuelinjection nozzle has two injection valve members to be formed, and controls a spray-hole at least by each valve element.In first injection valve member of hollow formation, settled movably second injection valve member.Two injection valve members are loaded to opening direction by the pressure in the pressure chamber respectively, can respectively overcome the power of closing and open the direction motion to beating.Can be optionally in Fuelinjection nozzle only first injection valve member be opened and at least one first spray-hole is discharged, two injection valve members are all opened and be discharged all spray-holes.This just makes and can come adaptive injection cross section according to the operating conditions of internal-combustion engine, thereby sprays consumption and the emission of harmful substances of guaranteeing to reduce to greatest extent fuel with the best that realizes fuel.Second injection valve member under certain operating conditions of internal-combustion engine, needs only to open first injection valve member, in must be maintained in its closed position.In existing fuel injection system, second injection valve member is loaded to closing direction by the pressure in the control chamber, control being connected of control chamber and pump work chamber by additional control valve, thereby the interior pressure of control chamber can be regulated.But this is very bothersome.
Summary of the invention
According to the present invention, a kind of fuel injection system that is used for internal-combustion engine is proposed, it has a high-pressure fuel pump and a Fuelinjection nozzle that is connected with this high-pressure fuel pump for each cylinder of internal-combustion engine, wherein, high-pressure fuel pump has a pump piston that is driven by internal-combustion engine in stroke motion, this pump piston limits a pump work chamber in a cylinder hole, this pump work chamber is connected with a pressure chamber of Fuelinjection nozzle; The control valve that also has an electricity operation, by being connected of this control valve control pump active chamber and an off-load zone, wherein, this Fuelinjection nozzle has two injection valve members, respectively control at least one spray-hole by them, wherein, in one first injection valve member, settled one second injection valve member movably, the power of closing that these two injection valve members can be overcome by the pressure-loaded in the pressure chamber is separately moved to opening direction, to discharge described at least one spray-hole, second injection valve member can remain in the closed position with the pressure in the control chamber that the pump work chamber is connected according to one, wherein, this control chamber has one and is controlled by pump piston, with being connected of pump work chamber, this stroke that is connected pump piston residing dead point when it begins delivery stroke hour is opened by pump piston, when the trip is big, closed by pump piston, in connecting, settled an one-way valve of opening towards control chamber, control valve the pump piston stroke little during at least part-time close so that in control chamber, supply with a pressure that increases and second injection valve member remained in its closed position.
The advantage of Fuelinjection nozzle of the present invention is, and is simple in structure, because do not need the control valve that adds.If second injection valve member will keep closing, then under the little situation of pump piston stroke, produce required pressure by closed control valve, this pressure that has improved is provided for control chamber and crosses one-way valve and is stored.Because control chamber and pump work chamber are separated when the pump piston stroke is big, thereby in control chamber, can not set up further pressure and the pressure set up can freely be selected to be used for the needs of fuel injection in the pump work chamber.And when second injection valve member did not need to keep closing but need open, then control valve was not closed when the pump piston stroke is little, thus can be in the pump work chamber and in the control chamber build-up pressure.
The favourable pattern and the extended architecture of fuel injection system of the present invention in other technological scheme, have been provided.Structure by claim 2 can be discharged the fuel that may flow out from the pump work chamber owing to the leakage between pump piston and the cylinder hole, thereby can not cause the pressure in the control chamber to raise.Structure by claim 3 can realize the simple especially structure of fuel injection system, because do not need independent control chamber.Can save the locational space of one-way valve by the structure of claim 4, structure by claim 5 can realize the autotelic off-load of control chamber, thereby can determine by the corresponding control of control valve when each spraying cycle begins: second injection valve member is to keep closing or can opening.Structure by claim 6 can realize the autotelic off-load of control chamber equally, and off-load is carried out in the inner dead centre zone of pump piston, does not have at this moment or only has very little leakage rate to enter the off-load pipeline from the pump work chamber.Can be implemented in the off-load that is connected that just makes during the delivery stroke of pump piston between control chamber and the pump work chamber by the structure of claim 7.Structure by claim 8 can guarantee, can not open for making second injection valve member keep closing in the pump work chamber during the build-up pressure first injection valve member.By the structure of claim 9 make it possible to for make second injection valve member keep closing build-up pressure after pressure decline in the pump work chamber can not cause pressure surge.
Description of drawings
Be described in the drawings a plurality of embodiment of the present invention, explained in detail in the following description.
Accompanying drawing is represented:
Fig. 1 is used for first embodiment's the longitudinal section schematic representation of the fuel injection system of internal-combustion engine,
This fuel injection system of Fig. 2 is used the enlarged view of the part of II mark in Fig. 1,
Fig. 3 fuel injection system second embodiment uses the part of III mark in Fig. 1,
Fig. 4 a to 4c the 3rd embodiment's local I II,
Fig. 5 a to 5c the 4th embodiment's local I II,
Fig. 6 the 5th embodiment's local I II,
The stroke of Fig. 7 fuel injection system pump piston is about the curve of the corner of the cam that drives this pump piston.
Embodiment
Fig. 1 to Fig. 6 has described a fuel injection system that is used for car combustion engine.This internal-combustion engine is the internal-combustion engine of self ignition preferably.This fuel injection system constitutes and is that each cylinder of internal-combustion engine respectively has a high-pressure fuel pump 10 and a Fuelinjection nozzle 12 that is connected with this high-pressure fuel pump with unit-injector system or with pump-pipeline-nozzle system.Under situation about constituting with pump-pipeline-nozzle system, high-pressure fuel pump 10 keeps away Fuelinjection nozzle 12 arrangements and is connected with Fuelinjection nozzle by pipeline.In described embodiment, fuel injection system constitutes with unit-injector system, and wherein, high-pressure fuel pump 10 and Fuelinjection nozzle 12 directly interconnect and form an element of construction.High-pressure fuel pump 10 has the pump piston 18 of a sealed guiding in the cylinder hole 16 of a pump housing 14, and it resists a Returnning spring 19 by a cam 20 of internal combustion (IC) engine camshaft in stroke motion power drives.Pump piston 18 defines a pump work chamber 22 in cylinder 16, fuel under high pressure is compressed in this pump work chamber when pump piston 18 carries out delivery stroke.When pump piston 18 carried out intake stroke, fuel 24 was flowed to pump work chamber 22 in the mode that is not shown specifically from the fuel reservoir of automobile.
But Fuelinjection nozzle 12 has the valve body 26 that a multi-part type constitutes, and in this valve body, one first injection valve member 28 can vertically move in a hole 30.As shown in Figure 2, valve body 26 its on the end regions of cylinder of internal combustion engine firing chamber, have at least one, preferred a plurality of first spray-holes 32, they are distributed on the circumference of valve body 26.First injection valve member 28 has a for example roughly tapered sealing surface 34 at it on the end regions of firing chamber, it and valve body 26 in valve seat 36 actings in conjunction that in the end regions of firing chamber, constitute, draw first spray-hole 32 from this valve seat or valve seat back.In valve body 26, between first injection valve member 28 and hole 30, an annular chamber 38 is arranged towards valve seat 36, this annular chamber carries out the transition in the pressure chamber 40 that surrounds first injection valve member 28 by radially enlarging of hole 30 in it deviates from the end regions of valve seat 36.First injection valve member 28 dwindles by cross section on the height of pressure chamber 40 and has a pressure shaft shoulder 42.Closed on the end that deviates from the firing chamber that spring 44 acts on first injection valve member 28 by first of pretension for one, by this spring, first injection valve member 28 is crushed on the valve seat 36.First closes in one first spring housing 46 that spring 44 is placed in valve body 26, and this spring housing is connected on the hole 30.
First injection valve member 28 at Fuelinjection nozzle 12 constitutes hollowly, guides movably second injection valve member 128 in a hole that coaxial heart constitutes in this injection valve member 28.Come at least one second spray-hole 132 in the control valve body 26 by second injection valve member 128.Described at least one second spray-hole 132 is settled towards skew ground, firing chamber with respect to described at least one first spray-hole 32 on the longitudinal axis of injection valve member 28,128.Second injection valve member 128 has a for example roughly tapered sealing surface 134 at it on the end regions of firing chamber, it and valve body 126 are drawn second spray-hole 132 in its valve seat that constitutes 136 actings in conjunction from this valve seat or valve seat back on the end regions of firing chamber.Second injection valve member 128 can be made up of two-part, and a part has sealing surface 134, towards the firing chamber, second portion away from the firing chamber be connected in the first portion.Near the combustion chamber side end of second injection valve member 128, on second injection valve member, form a pressure side 142, the pressure when first injection valve member 28 is opened in the pressure chamber 40 acts on this pressure side.
As shown in Figure 1, in valve body 26, constitute one away from the firing chamber be connected second spring housing 146 in first spring housing 46, in this second spring housing, settled one to act on second on second injection valve member 128 and close spring 144.First injection valve member 28 is bearing in first by a spring seat 45 that stretches in first spring housing 46 and closes on the spring 44.Second injection valve member 128 or supporting depression bar 147 thereon pass first spring housing 46 and extend in second spring housing 146 and be bearing in second by a spring seat 145 and close on the spring 144.Second close spring 144 with its overhang bracket that deviates from second injection valve member 128 on the bottom of second spring housing 146.Spring seat 145 is placed in second spring housing 146 with having big radial clearance, therefore spring housing 146 on spring seat 145 with below have approximately uniform at least pressure.
A passage 48 is drawn from pump work chamber 22, and the valve body 26 by the pump housing 14 and multi-part type enters in the pressure chamber 40 of Fuelinjection nozzle 12.By the control valve 23 control pump active chambers 22 of an electricity operation and being connected of a unloading cavity, for example can be used as this unloading cavity with fuel reservoir 24 or a zone that maintains the pressure slightly higher therein at least indirectly than fuel reservoir 24.Control valve 23 is controlled by an electric control equipment 25, wherein, thereby sets up and the time points of control fuel injection and the fuel quantity of injection by the pressure in the control valve 23 control pump active chambers 22.Control valve 23 can have an electromagnetic actuator or a piezoelectric-actuator.Control valve 23 for example constitutes as 2/2 selector valve and can change between a switching position of opening and a switching position of closing.
First embodiment of fuel injection system has been described in Fig. 1.At this, second spring housing 146 forms a control chamber, spring seat 145 and depression bar 147 form a control piston together, by this control piston, when the increased pressure in the spring housing 146, except that the power of closing spring 144, also be attached to and produce a power on second injection valve member 128 to closing direction.Control chamber 146 can be connected with pump work chamber 22 by a pipeline 50.Pipeline 50 is from control chamber 146, at first in the part of valve body 26, extend, in this part, constitute control chamber 146, pass an intermediate washer 27 that is placed between the valve body 26 and the pump housing 14 then, then by the pump housing 14, there, the terminal of pipeline 50 is roughly led on the circumference in cylinder hole 16 diametrically.In the part of pipeline 50 by valve body 26, in the intermediate washer 27 and hole and/or grooves in the pump housing 14 form.Pipeline 50 feeds in the control chamber 146 above or below spring seat 145.Spring seat 145 its in the face of close compression area on the upper side of spring 144 greater than spring seat 145 at it in the face of the compression area on the downside of depression bar 147, because depression bar 147 abuts on this downside.Like this, produce a power by 145 pairs second injection valve members 128 of spring seat to closing direction according to the pressure in the control chamber 146.
Settled an one-way valve 52 of opening towards control chamber 146 in pipeline 50, it has a closing element 55 that is loaded towards valve seat 54 by the Returnning spring 53 of a pretension on closing direction, and this closing element 55 for example can be spherical.One-way valve 52 is placed in the zone of pipeline 50, and extend at the other control chamber 146 that is parallel to of control chamber 146 sides in this zone.Can draw the off-load pipeline 56 of a feeding area of low pressure between the feeding mouth in one-way valve 52 and pipeline 50 feeding cylinder holes 16 from pipeline 50, the backflow road of for example leading to fuel reservoir can be used as this area of low pressure.In off-load pipeline 56, preferably settle a throttle position 57.
Should not open at second injection valve member 128 and have only under the internal combustion engine operation condition that first injection valve member 28 will open, at pump piston 18 during the stroke of its bottom dead-centre, make control valve 23 determine that one time point closes by control gear 25, thus in pump work chamber 22 build-up pressure.As long as pipeline 50 feeds the feeding mouth in cylinder holes 16 and is opened when pump piston 18 strokes are little, in supply pressure in pipeline 50 and control chamber 54 just under the situation that one-way valve 52 is opened.Along with stroke increases, pump piston 18 cuts out the feeding mouth that pipeline 50 feeds cylinder hole 16, and one-way valve 52 is closed, and makes that the fuel in the control chamber 146 is stored under pressure.When the stroke of pump piston 18 further increased, control valve 23 can be opened by control gear 25 again, made that the pressure in the pump work chamber 22 descends again or no longer rising, did not have fuel to spray.Control valve 23 also can just be opened again when pump piston 18 strokes are little, as long as the feeding mouth of pipeline 50 is also discharged by pump piston 18, wherein, the pressure that supplies under the situation that one-way valve 52 is closed in the control chamber 146 is held.By the pressure in the control chamber 146, second injection valve member 128 closes second that additional controlled piston 145 loads to closing direction outside the power of spring 144, thereby second injection valve member is not opened.
Only spray by the fuel of opening 28 realizations of first injection valve member and follow controlled valve 23 controls, this control valve is closed at a definite time point.When the pump work chamber 22 and the pressure in the pressure chamber 40 of Fuelinjection nozzle 12 high like this, make and to act on impacting force on first injection valve member 28 greater than first power of closing spring 44 by the pressure shaft shoulder 42 by this pressure, then Fuelinjection nozzle 12 is opened, its mode is, first injection valve member 28 lifts and described at least one first spray-hole 32 is discharged from valve seat 36 with its sealing surface 34.A fuel injection cycle can comprise one or more pre-sprays, a main injection and one or more back injection.Like this, on Fuelinjection nozzle 12, only there is the part of whole injection cross section to be opened by first spray-hole 32.By control valve 23 is opened, fuel sprays and finishes, thereby pump work chamber 22 and pressure chamber 40 are by off-load.Under high pressure may be derived through off-load pipeline 56 by 22 fuel that come out to arrive in the pipeline 50 from the pump work chamber owing to leak.The pressure off-load of control chamber 146 realizes by existing leakage way on the one-way valve 52 and/or on the passage of depression bar 147 to first spring housing 46.
Under the internal combustion engine operation condition that second injection valve member 128 also will be opened, by control gear 25, control valve 23 is not closed during from its stroke of its bottom dead-centre beginning at pump piston 18, thus in pump work chamber 22 build-up pressure not, closed by pump piston 18 up to the feeding mouth of pipeline 50.At this moment the pressure that does not increase in control chamber 146, thereby second injection valve member 128 is at least substantially only closed spring 144 by second and is loaded to closing direction.Pressure foundation and fuel injection time point are by being determined by control gear 25 closed control valves 23.Pressure in pump work chamber 22 and pressure chamber 40 is high like this, make by the pressure shaft shoulder 42 to opening directive effect when the power on first injection valve member 28 is closed spring 44 to power that closing direction produces greater than first, first injection valve member 28 is opened, and fuel sprays by described at least one first spray-hole 32.Pressure in pressure chamber 40 is high like this, make it by pressure side 142 on second injection valve member 128 to opening direction produce a ratio close spring 144 act on second injection valve member 128 close the power of Li Genggao the time, second injection valve member 128 is also opened after first injection valve member 28, and second spray-hole 132 is discharged.Thereby on Fuelinjection nozzle 12, whole injection cross section is released, and can spray bigger fuel quantity.A fuel injection cycle can comprise one or more pre-sprays, a main injection and one or more back injection.
Can stipulate that the injection cross section of being made up of first spray-hole 32 and second spray-hole 132 is approximate at least same big, thereby when only opening first injection valve member 28, just open whole injection cross section half.Can stipulate also that perhaps first spray-hole, 32 to the second spray-holes 132 form a greater or lesser injection cross section.
By control gear 25 by on purpose making second injection valve member 128 at pump piston 18 strokes hour closed control valve 23 and keep closing or by hour control valve 23 being stayed open at pump piston 18 strokes and second injection valve member 128 being opened, therefore, the fuel injection amount that occurs in the time of also can on purpose being equilibrated at second injection valve member 128 and opening by control gear 25 increases, its mode is corresponding reduction injection duration.Like this can be only by first spray-hole, 32 burner oils with both avoided during transition the jump type of fuel injection amount to change between also by second spray-hole, 132 burner oils by first spray-hole 32.
Second embodiment's of fuel injection system a part has been described in Fig. 3, its basic structure is with identical in first embodiment, be connected with pump work chamber 22 by another pipeline 60 but control chamber 146 is also additional except that pipeline 50, pipeline 60 leads on the circumference in cylinder hole 16.This another pipeline 60 directly feeds in the control chamber 146, promptly by one-way valve 52, and passes valve body 26, intermediate washer 27 and the pump housing 14 with the form in groove and/or hole and extends.The feeding mouth that pipeline 60 enters cylinder hole 16 on longitudinal axis 17 directions in cylinder hole 16 like this feeding mouth with respect to pipeline 50 settle, make it compare with the feeding mouth of pipeline 50 and more hour just closed by pump piston 18 at the stroke of pump piston 18.The feeding mouth that these two pipelines 50 and 60 enter cylinder hole 16 can form by the unique hole of processing in the pump housing 14, and this hole favours with respect to the radial plane extension of cylinder hole 16 longitudinal axis 17 and outwards is closed by dress closure member 61 within it.One-way valve 52 is placed in pipeline 50 and enters in the feeding port area of control chamber 146, and with for example approximate at least concentric of depression bar 147, its Returnning spring 53 is bearing on the depression bar 147, and closing element 55 is pressed to the valve seat 54 that constitutes on intermediate washer 27.At this, depression bar 147 is formed control piston with spring seat 145, by this control piston, according to the pressure in the control chamber 146 second injection valve member 128 is produced the power to closing direction.
When the stroke of pump piston 18 in its bottom dead-centre enters cylinder hole 16, at first the feeding mouth of another pipeline 60 is closed by pump piston 18, when the pump piston stroke is bigger, then the feeding mouth of pipeline 50 is closed.Like this, under the situation that control valve 23 is closed, the fuel that is under the pressure can be supplied in the control chamber 146 through pipeline 50 and another pipeline 60.Pump piston 18 cuts out the feeding mouth that another pipeline 60 enters cylinder hole 16 from a travel position, and after the trip position, control valve 23 can be opened again, because control chamber 146 just separates with pump work chamber 22 by pump piston 18 and one-way valve 52 like this.If fuel injection cycle is through with, then pump piston 18 comes out to its bottom dead-centre motion from cylinder hole 16 in its intake stroke, and fuel is inhaled in the pump work chamber 22 in intake stroke.At this moment, the feeding mouth that another pipeline 60 enters cylinder hole 16 is discharged, make control chamber 146 be connected, in this pump work chamber, just have only a low pressure, make control chamber 146 by off-load with pump work chamber 22 by pump piston 18.Reach control chamber 146 releases faster thus, thereby when each delivery stroke of pump piston 18 begins, can set up, thereby can stop or realize opening of second injection valve member 128 by the pressure in control valve 23 definite control chambers 146 than first embodiment.
Fig. 4 a has described the part of simplifying very much by the 3rd embodiment's fuel injection system to 4c, wherein, compares with second embodiment and to have changed the feeding mouth position that another pipeline 160 enters cylinder hole 16.On longitudinal axis 17 directions in cylinder hole 16, the feeding mouth of another pipeline 160 staggers big apart from a from the feeding mouth of pipeline 50 towards cam 20.Pump piston 118 has a circular groove 162, and this circular groove is leaving distance with the end in the qualification pump work chamber 22 of pump piston.Pipeline 160 enters the position of feeding mouth in cylinder hole 16 and the position of circular groove 162 on pump piston 118 can mutual like this coordination, make that pipeline 160 enters the feeding mouth in cylinder hole 16 by circular groove 162 releases of pump piston 118 when pump piston 118 arrives its inner dead centre, pump piston 118 is the darkest in inner dead centre stretches into cylinder hole 16.Can stipulate that the feeding mouth of another pipeline 160 is connected with a zone that is connected with the area of low pressure in cylinder hole 16 by circular groove 162 by pump piston 118.Like this, thus control chamber 146 is connected also off-load by pipeline 160 with cylinder hole 16 in the inner dead centre zone of pump piston 118.The stroke of pump piston 118 is little in Fig. 4 a, and at this, the feeding mouth of pipeline 50 is released and the feeding mouth of another pipeline 160 is closed.The stroke of pump piston 118 is big in Fig. 4 b, and at this moment not only the feeding mouth of the feeding mouth of pipeline 50 but also another pipeline 160 all is closed.Pump piston 118 is positioned at its inner dead centre in Fig. 4 c, and at this moment the feeding mouth of pipeline 50 is closed and the feeding mouth of another pipeline 160 is released.
Enter the layout of the feeding mouth in cylinder hole 16 by the pipeline 160 of above explanation, can realize very big the overlapping between the feeding mouth of pump work chamber 22 and another pipeline 160 of pump piston 118 and cylinder hole 16, thereby not have or have only very little fuel leak from pump work chamber 22 to another pipeline 160 and then to control chamber 146.Pipeline 50 and another pipeline 160 cross section in they enter the feeding port area in cylinder hole 16 should be selected as far as possible for a short time, and 22 fuel that leak are few from the pump work chamber to keep.
Fig. 5 a has described the part of simplifying very much by the 4th embodiment's fuel injection system to 5c, and its basic structure is identical with the 3rd embodiment, but pipeline 50 is additional through a line segments 150 feeding cylinder holes 16.The feeding mouth that line segments 150 enters cylinder hole 16 from the feeding mouth of pipeline 50 towards cam 20 distance that staggers, the feeding mouth of line segments 150 with respect to the feeding mouth of another pipeline 160 also towards cam 20 distance that staggers, when the stroke of pressing Fig. 5 a pump piston 118 hour, the feeding mouth that makes pipeline 50 enter cylinder hole 16 by pump piston is released, and the feeding mouth of the feeding mouth of line segments 150 and another pipeline 160 is closed by pump piston 118.When the stroke of pressing Fig. 5 b pump piston 118 is big, the feeding mouth of pipeline 50 is closed and the feeding mouth of line segments 150 is discharged by the circular groove 162 of pump piston 118 by pump piston, and the feeding mouth of another pipeline 160 still keep closing.Can make pipeline 50 off-loads by releasing tube highway section 150, discharge so that enter into the fuel of pipeline 50 from pump work chamber 22 owing to leak.This makes the throttle position 57 in the off-load pipeline 56 little flow cross can be arranged or can cancel off-load pipeline 56.When pressing Fig. 5 c pump piston 118 and arrive its inner dead centres, by its circular groove 162 the feeding mouth of another pipeline 160 also is released, thereby control chamber 146 is by off-load.Pipeline 50 and another pipeline 160 cross section in they enter the feeding port area in cylinder hole 16 should be selected as far as possible for a short time, and 22 fuel that leak are few from the pump work chamber to keep.
Fig. 6 has described the fuel injection system by the 5th embodiment, and its basic structure is identical with first embodiment.At this, first spring housing 46 also can be connected with pump work chamber 22 by a pipeline 64 except second spring housing 146.Pipeline 64 leads on the circumference in cylinder hole 16 and hour is discharged, closes when stroke is big at its stroke by pump piston 18.One off-load pipeline 66 feeds an area of low pressure from pipeline 66, has settled a throttle position 67 in this zone.Produce a power through 45 pairs first injection valve members 28 of spring seat to closing direction by the pressure in first spring housing 46.Like this, in first spring housing 46 corresponding to the pressure feed in the control chamber 146 also supply pressure, by this pressure the power of closing that acts on first injection valve member 28 is improved, thereby avoid reliably when pump piston 22 strokes are little, when pump work chamber 22 internal pressures are set up, first injection valve member being opened by closed control valve 23.The pressure of in control chamber 146, being supplied with by one-way valve 52 maintenances, and the process of the pressure in first spring housing 46 off-load pipeline 66 is by off-load, thereby close spring 44 by first and be identified for the pressure that ensuing fuel sprays, first injection valve member 28 is opened when this pressure.Can stipulate that also pipeline 64 does not lead to cylinder hole 16, lead in the pipeline 50 that off-load this moment pipeline 56 just also is used for the off-load of spring housing 46 but enter between the feeding mouth in cylinder hole 16 and the one-way valve 52 at pipeline 50.
As mentioned above, the pressure of hour being set up at the stroke of pump piston 118 in pump work chamber 22 is again by off-load, and its mode is that control valve 23 is opened by control gear 25.At this, when opening, control valve 23 may cause the pressure surge in the fuel injection system, this makes the time point of accurately control fuel injection and emitted dose become difficult.Perhaps can reach 22 inherences, pump work chamber by the special construction of cam 20 and set up, produce the stroke of pump piston 18 by this cam to supplying to pressure required in the control chamber 146 pressure off-load afterwards.
Fig. 7 has provided the curve of the stroke of pump piston 18 about the corner of cam 20.The shape of cam 20 is such: pump piston 18 is from 0 ° of corner of cam 20, this is the bottom dead-centre of pump piston 18, at first moves in pump work chamber 22 with little stroke, wherein, stroke h is just big or small like this, and the feeding mouth that makes pump piston 18 pipeline 50 not entered cylinder hole 16 is closed.If control valve 23 is closed during pump piston 18 is in this little stroke h, in pump work chamber 22 and control chamber 146, just carries out pressure and set up.When cam 20 continued rotation, pump piston 18 was owing to the effect of Returnning spring 19 slightly moves out from pump work chamber 22 again.At this moment, the pressure in the pump work chamber 22 descends again, and control valve 23 can be opened, and can not cause pressure surge owing to the off-load in pump work chamber 22.When cam 20 continued rotation, pump piston 18 motion in pump work chamber 22 again from one stroke H, was closed the feeding mouth that pipeline 50 enters cylinder hole 16 by pump piston 18.This section pump piston 18 strokes that produced when cam 20 continues rotation can be used for producing high pressure and be used for fuel and spray in pump work chamber 22.
Claims (10)
1. the fuel injection system that is used for internal-combustion engine, it has a high-pressure fuel pump (10) and a Fuelinjection nozzle that is connected with this high-pressure fuel pump (12) for each cylinder of internal-combustion engine, wherein, high-pressure fuel pump (10) has a pump piston (18 that is driven by internal-combustion engine in stroke motion; 118), this pump piston limits a pump work chamber (22) in a cylinder hole (16), and this pump work chamber is connected with a pressure chamber (40) of Fuelinjection nozzle (12); The control valve (23) that also has an electricity operation, by being connected of this control valve control pump active chamber (22) and an off-load zone, wherein, this Fuelinjection nozzle (12) has two injection valve members (28,128), respectively control at least one spray-hole (32 by them, 132), wherein, in one first injection valve member (28), settled one second injection valve member (128) movably, these two injection valve members (28,128) close power to opening the direction motion for one that can be overcome by the pressure-loaded in the pressure chamber (40) separately, to discharge described at least one spray-hole (32,132), second injection valve member (128) can remain in the closed position according to the pressure in the control chamber (146) that can be connected with pump work chamber (22), it is characterized in that, this control chamber (146) has one by pump piston (18) control, with be connected (50) of pump work chamber (22), this connection (50) is at pump piston (18; 118) when it begins delivery stroke the stroke at residing dead point hour by pump piston (18; 118) open, when the trip is big, closed by pump piston (18), in connecting (50), settled an one-way valve (52) of opening towards control chamber (146), control valve (23) pump piston (18) stroke little during at least part-time close so that in control chamber (146), supply with a pressure that increases and second injection valve member (128) remained in its closed position.
2. by the described fuel injection system of claim 1, it is characterized in that, between one-way valve (52) and pump work chamber (22), draw an off-load of leading to an area of low pressure and connect (56), in this off-load connects, preferably settle a throttle position (57) from being connected of control chamber (146) and pump work chamber (22) (50).
3. by claim 1 or 2 described fuel injection systems, it is characterized in that, second injection valve member (128) is loaded on its closing direction by a spring (144) of closing that is placed in the pretension in the spring housing (146) at least indirectly, this spring housing is as control chamber (146), in this control chamber (146), settled the control piston (145) of indirectly-acting to second injection valve member (128) at least, gone up at second injection valve member (128) by the pressure in the control chamber (54) by this control piston and produce one power to its closing direction.
4. by the described fuel injection system of claim 3, it is characterized in that the part area that is connected (50) of control chamber (146) and pump work chamber (22) is extended on control chamber (146) next door, one-way valve (52) is placed in this zone of connection (50).
5. by one of claim 1 to 4 described fuel injection system, it is characterized in that, control chamber (146) have by pump piston (18) control, be connected (60) with another of pump work chamber (22), this another connection (60) more hour is just closed by pump piston (18) with wherein having settled to compare being connected of one-way valve (52) (50) at pump piston (18) stroke.
6. by one of claim 1 to 4 described fuel injection system, it is characterized in that, control chamber (146) have another by pump piston (118) control, be connected (160) with the off-load of an area of low pressure, this off-load connects in the feeding cylinder hole (16), it is only opened in the inner dead centre zone of this pump piston by pump piston (118), and its feeding mouth by pump piston (118) control leaves distance with pump work chamber (22) on longitudinal axis (17) direction of cylinder hole (16).
7. by the described fuel injection system of one of aforesaid right requirement, it is characterized in that, draw one and controlled connecting between feeding mouth that (50) feed cylinder holes (16) and the one-way valve (52) by pump piston (118) from being connected (50), the linkage section (150) that leads to an area of low pressure, this linkage section feeds in the cylinder hole (16) towards the bottom dead-centre of pump piston (118) with respect to connecting (50) on longitudinal axis (17) direction of cylinder hole (16) with staggering, at the stroke of pump piston (118) hour, if connecting the feeding mouth of (50) is discharged by pump piston (118), linkage section (150) enters the feeding mouth in cylinder hole (16) and is closed by pump piston, when the stroke of pump piston (118) was big, the feeding mouth of linkage section (150) was opened.
8. by the described fuel injection system of one of aforesaid right requirement, it is characterized in that, in addition can be by one by another control chamber (46) pump piston (18) control, that the interior connection (64) in feeding cylinder hole (16) is connected with pump work chamber (22), first injection valve member (28) is loaded on closing direction by the pressure in this another control chamber (46) at least indirectly, connects (64) and hour is opened, is closed when stroke is big at pump piston (18) at pump piston (18) stroke.
9. by the described fuel injection system of one of aforesaid right requirement, it is characterized in that pump piston (18 in a fuel injection cycle; 118) at first in cylinder hole (16), move with little stroke, so that the pressure in the pump work chamber (22) is raise, and from cylinder hole (16), move out, so that the pressure in the pump work chamber (22) is descended, then in cylinder hole (16), move with big stroke.
10. by the described fuel injection system of claim 9, it is characterized in that pump piston (18; 118) power of the opposing Returnning spring of the cam (20) by camshaft (19) is moved to cylinder hole (16) in its stroke motion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10359169.9 | 2003-12-17 | ||
| DE2003159169 DE10359169A1 (en) | 2003-12-17 | 2003-12-17 | Fuel injection device for internal combustion engine, has control valve that closes during small stroke of piston to keep valve component in closed position, and control space separated from operating space during big stroke of piston |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1629471A true CN1629471A (en) | 2005-06-22 |
Family
ID=34683454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410082043 Pending CN1629471A (en) | 2003-12-17 | 2004-12-17 | Fuel jetting device used in internal combustion engine |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1629471A (en) |
| DE (1) | DE10359169A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101900061A (en) * | 2009-04-02 | 2010-12-01 | 曼柴油机欧洲股份公司 | Valve unit of fuel supply device |
| CN101868613B (en) * | 2007-11-19 | 2012-06-20 | 罗伯特·博世有限公司 | Compact injector device with two armatures |
| CN103339369A (en) * | 2010-12-28 | 2013-10-02 | 现代重工业株式会社 | Electronically controlled fuel injection valve |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104481767B (en) * | 2014-12-05 | 2017-02-22 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Common-rail oil injector |
-
2003
- 2003-12-17 DE DE2003159169 patent/DE10359169A1/en not_active Withdrawn
-
2004
- 2004-12-17 CN CN 200410082043 patent/CN1629471A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101868613B (en) * | 2007-11-19 | 2012-06-20 | 罗伯特·博世有限公司 | Compact injector device with two armatures |
| CN101900061A (en) * | 2009-04-02 | 2010-12-01 | 曼柴油机欧洲股份公司 | Valve unit of fuel supply device |
| CN101900061B (en) * | 2009-04-02 | 2013-01-02 | 曼柴油机欧洲股份公司 | Valve unit of fuel supply device |
| CN103339369A (en) * | 2010-12-28 | 2013-10-02 | 现代重工业株式会社 | Electronically controlled fuel injection valve |
| CN103339369B (en) * | 2010-12-28 | 2015-07-01 | 现代重工业株式会社 | Electronically controlled fuel injection valve |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10359169A1 (en) | 2005-07-21 |
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