CN100467853C - Fuel injection device - Google Patents
Fuel injection device Download PDFInfo
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- CN100467853C CN100467853C CNB2005800065147A CN200580006514A CN100467853C CN 100467853 C CN100467853 C CN 100467853C CN B2005800065147 A CNB2005800065147 A CN B2005800065147A CN 200580006514 A CN200580006514 A CN 200580006514A CN 100467853 C CN100467853 C CN 100467853C
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- fuel
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- common rail
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- 239000000446 fuel Substances 0.000 title claims abstract description 427
- 238000002347 injection Methods 0.000 title claims abstract description 29
- 239000007924 injection Substances 0.000 title claims abstract description 29
- 230000000694 effects Effects 0.000 claims description 28
- 230000000630 rising effect Effects 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims 2
- 238000003780 insertion Methods 0.000 claims 2
- 230000008676 import Effects 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 abstract description 15
- 239000007921 spray Substances 0.000 description 11
- 239000003921 oil Substances 0.000 description 8
- 238000005086 pumping Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 241000220317 Rosa Species 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000004087 circulation Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005507 spraying Methods 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
- F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
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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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
In a fuel injection valve (1) for an internal combustion engine, an intermediate-chamber control valve (26), operated by a fuel pressure in a common rail (2), is provided in a fuel flow path (25) communicating between a two-position switching three-way valve (8) and an intermediate chamber (20) of a pressure booster piston (17). The intermediate-chamber control valve (26) operates the pressure booster piston (17) when the fuel pressure in the common rail (2) is in a high-pressure side fuel region and stops the pressure booster piston (17) from operating when the fuel pressure in the common rail (2) is in a low-pressure side fuel region.
Description
Technical field
The present invention relates to fuel injection system.
Background technique
Known have a kind of fuel injection system, have the pressure controling chamber that is formed on the needle-valve inner end and be used to increase the medial compartment of the charged piston of jet pressure, be discharged in the fuel drain passageway by the fuel under high pressure that will supply in the indoor common rail of pressure control, needle-valve is opened and burner oil, be discharged in the fuel drain passageway by the fuel under high pressure that will supply in the common rail in the medial compartment, drive charged piston and increase fueling injection pressure, wherein, pressure controling chamber links to each other with the fuel drain passageway via the 3-position-3-way valve with medial compartment, switching effect by this three-way valve, when burner oil, increase jet pressure if desired, pressure controling chamber is linked to each other with the fuel drain passageway with medial compartment simultaneously, if and when fuel sprays, do not need to increase jet pressure, promptly stop to drive charged piston, then only make pressure controling chamber's link to each other with the fuel drain passageway (opening communique 2003-No. 106235) with reference to the spy.
But, in above-mentioned 3-position-3-way valve, supply to valve body by change and drive field current value in the electromagnetic coil of usefulness, valve body is moved on arbitrary position in the end position of end position, neutral position and opposite side of a side.In this case, though can valve body be still on the neutral position by electromagnetic force in theory, but in fact the position of valve body is extremely unstable, particularly in the fuel injection system on the motor that will be installed to judder, be unwilling at present to adopt by electromagnetic force to make valve body move to the 3-position-3-way valve in neutral position.And, if valve body is switched, must increase the lift amount of valve body on three positions, in order to increase the lift amount of valve body, must increase electromagnetic coil.Yet, in fuel injection system, be difficult to increase electromagnetic coil.
Summary of the invention
The invention provides a kind of fuel injection system, it can use stable two position three-way valve to control the pressurization of charged piston.
According to the present invention, a kind of fuel injection system is provided, the medial compartment that is formed on pressure controling chamber on the needle-valve inner end and the charged piston that is used to increase jet pressure by two position three-way valve optionally with shared track in or the fuel drain passageway link to each other, be discharged to needle-valve is opened and burner oil by supplying to fuel under high pressure in the indoor common rail of pressure control, be discharged to and drive charged piston in the fuel drain passageway and increase fueling injection pressure by supplying to fuel under high pressure in the common rail in the medial compartment, wherein, be used to be communicated with in the fuel distribution channel of three-way valve and medial compartment, configuration is by the power-actuated medial compartment control valve of the fuel pressure in the common rail, the medial compartment control valve is controlled the flow path area of fuel distribution channel according to the fuel pressure in the common rail, when the fuel pressure in the common rail is in the high pressure side fuel region that is higher than intended fuel pressure, drive charged piston, when the fuel pressure in the common rail is in the low voltage side fuel region that is lower than intended fuel pressure, compare when fuel pressure in the shared track is in the high pressure side fuel region, weaken the pressurization of charged piston or stop to drive charged piston.
Description of drawings
Fig. 1 is the overall diagram of fuel injection system;
Fig. 2 is the low voltage side fuel region I of expression common rail pressure and the figure of high pressure side fuel region II;
Fig. 3 is first embodiment's of expression medial compartment control valve figure;
Fig. 4 is second embodiment's of expression medial compartment control valve figure;
Fig. 5 is the 3rd embodiment's of expression medial compartment control valve figure;
Fig. 6 is the 4th embodiment's of expression medial compartment control valve figure;
Fig. 7 is the 5th embodiment's of expression medial compartment control valve figure;
Fig. 8 is the 3rd embodiment's of expression medial compartment control valve the figure of variation;
Fig. 9 is the figure of expression medial compartment control valve etc.;
Figure 10 is the figure of expression medial compartment control valve;
Figure 11 is the overall diagram of fuel injection system;
Figure 12 is another embodiment's of expression medial compartment control valve figure;
Figure 13 is another embodiment's of expression medial compartment control valve figure;
Figure 14 is the figure of the variation embodiment illustrated in fig. 13 of expression medial compartment control valve.
Embodiment
The whole fuel injection system of Fig. 1 graphic representation, in Fig. 1, part 1 expression that the coverlet dot and dash line surrounds is installed in the Fuelinjection nozzle on the motor.As shown in Figure 1, fuel injection system comprises the common rail 2 that is used for storage high pressure fuel, via high pressure fuel pump 4 fuel supply in the fuel tank 3 is arrived in this common rail 2.Spray volume by control high pressure fuel pump 4, fuel pressure in the common rail 2 is maintained the target fuel pressure corresponding with the internal combustion engine operation state, and the common rail 2 interior fuel under high pressure that maintain target fuel pressure supply in the Fuelinjection nozzle 1 via high-pressure fuel path 5.
As shown in Figure 1, Fuelinjection nozzle 1 comprises in the firing chamber nozzle for jetting fuel portion 6 of being used for, is used to the three-way valve 8 that increases the pressurized machine 7 of jet pressure and be used to switch fuel passage.This three-way valve 8 is made of two position three-way valve, can switch on the arbitrary position in these two positions, end side position of representing with Fig. 8 b among the side end position represented with 8a among Fig. 1 and Fig. 1.Spray nozzle part 6 has needle-valve 9, is carried out the spout 10 (not shown) of open and close controlling by the front end of needle-valve 9 in the front end formation of spray nozzle part 6.Around needle-valve 9, form the nozzle box 11 that is full of the fuel under high pressure of being sprayed, on the end face of needle-valve 9, form the pressure controling chamber 12 that is full of fuel.In pressure controling chamber 12, insert pressure spring 13, its downwards, promptly to the valve closing direction to needle-valve 9 application of forces, this pressure controling chamber 12 links to each other with three-way valve 8 via fuel distribution channel 14.
On the other hand, pressurized machine 7 has the charged piston 17 that is made of integrally formed big footpath piston 15 and path piston 16.With the end face of the big footpath piston 15 of path piston 16 opposite sides on form the hyperbaric chamber 18 that is full of fuel under high pressure, this hyperbaric chamber 18 links to each other with high-pressure fuel path 5 via high-pressure fuel path 19.Thus, the fuel pressure (hereinafter referred to as common rail pressure) in the common rail 2 acts in the hyperbaric chamber 18 all the time.With respect to this, on the end face of the big footpath piston 15 around the path piston 16, form the medial compartment 20 that is full of fuel, in this medial compartment 20, insert pressure spring 21 to 18 pairs of big footpaths, hyperbaric chamber piston 15 application of forces.And, with the end face of the path piston 16 of big footpath piston 15 opposite sides on form the pumping chamber 22 that is full of fuel, this pumping chamber 22 and nozzle box 11 via high-pressure fuel path 23, can only link to each other with high-pressure fuel path 5 from safety check 24 and the high-pressure fuel path 19 of high-pressure fuel path 19 to 23 circulations of high-pressure fuel path.
On the other hand, in the fuel distribution channel 25 that is communicated with three-way valve 8 and medial compartment 20, dispose medial compartment control valve 26, by the flow path area of these medial compartment control valve 26 control fuel distribution channels 25.In other words, medial compartment control valve 26 links to each other with three-way valve 8 via fuel distribution channel 25a and fuel distribution channel 14, and links to each other with medial compartment 20 via fuel distribution channel 25b.And, for actuating valve work, via high- pressure fuel path 5,19 and high-pressure fuel path 27 with the high-pressure fuel in the common rail 2 to medial compartment control valve 26.
On the other hand, on three-way valve 8, except high-pressure fuel path 5 and fuel distribution channel 14, for example also be connected with and the fuel tank 3 interior fuel drain passageways 28 that link to each other.This three-way valve 8 drives by actuators such as o or piezoelectric element 29, by this three-way valve 8 fuel distribution channel 14 is optionally linked to each other with either party in high-pressure fuel path 5 or the fuel drain passageway 28.
Then with reference to Fig. 1, the needle-valve 9 when medial compartment control valve 26 is opened the stream of fuel distribution channel 25 fully and the action of charged piston 17 describe.
Fig. 1 represents the situation that the fuel passage switching effect by three-way valve 8 makes fuel distribution channel 14 link to each other with high-pressure fuel path 5, in this case, is common rail pressure in 20 in the pressure controling chamber 12 and in the medial compartment.On the other hand, at this moment, in the nozzle box 11, in the hyperbaric chamber 18 and also be common rail pressure in the pumping chamber 22.At this moment, compare with the power that nozzle group valve 9 is risen by the fuel pressure in the nozzle box 11, the power that the elastic force by fuel pressure in the pressure controling chamber 12 and pressure spring 13 descends needle-valve 9 is bigger.Therefore, needle-valve 9 descends, and consequently, needle-valve 9 is closed, and stops from spout 10 burner oils.On the other hand, about pressurized machine 7, as mentioned above, in the hyperbaric chamber 18, in the medial compartment 20 and be common rail pressure in the pumping chamber 22, thereby this moment, charged piston 17 remained on the state that the elastic force by pressure spring 21 rises as shown in Figure 1.
On the other hand, when the path switching effect by three-way valve 8 makes fuel distribution channel 14 link to each other with fuel drain passageway 28, because the fuel pressures in the pressure controling chamber 12 of spray nozzle part 6 descend, consequently, needle-valve 9 is opened, and the fuel in the nozzle box 11 sprays from spout 10.On the other hand, at this moment, because the decline of the fuel pressure in the medial compartment 20, thereby effect has downward bigger power on charged piston 17, consequently, the fuel pressures in the pumping chamber 22 become and are higher than common rail pressure.Therefore, at this moment, also becoming via the nozzle boxs' 11 interior fuel pressures that link to each other in high-pressure fuel path 23 and the pumping chamber 22 is higher than common rail pressure, during burner oil, keeps this higher fuel pressure.Therefore, when needle-valve 9 is opened, with the jet pressure that is higher than common rail pressure from spout 10 burner oils.
Then, as shown in Figure 1, when the fuel passage switching effect by three-way valve 8 links to each other fuel distribution channel 14 once more with high-pressure fuel path 5, become common rail pressure in the pressure controling chamber 12 of spray nozzle part 6, consequently, stop burner oil.At this moment, also become common rail pressure in the medial compartment 20 of pressurized machine 7, consequently, charged piston 17 keeps propradation shown in Figure 1 once more by the elastic force of pressure spring 23.
On the other hand, block at medial compartment control valve 26 under the situation of fuel distribution channel 25, no matter the switching effect by three-way valve 8 makes fuel distribution channel 25a link to each other with high-pressure fuel path 5 or links to each other with fuel drain passageway 28, fuel pressure in the medial compartment 20 does not all change, therefore, do not drive charged piston 17.Thereby this moment, be always common rail pressure in the nozzle box 11, thereby the jet pressure during burner oil is a common rail pressure.Like this, control the pressurization of charged pistons 17 by medial compartment control valve 26.
In compression ignition internal combustion engine, low at particularly dally when running mechanicalness noise of light hours, if thereby produce bigger combustion noise this moment, bring uncomfortable feeling can for the person of taking.But, if when light load turns round or when running idle running increase jet pressure and improve Spraying rate because firing pressure sharply rises, can produce combustion noise, thereby this moment, must reduce jet pressure, common rail pressure when reducing combustion noise.On the other hand, when high loaded process, owing to needing to spray a large amount of fuel in a certain specified time limit jet pressure is raise, thereby common rail pressure improve.As mentioned above, common rail pressure, the output torque hour reduction at engine load or internal-combustion engine raises when the output torque of engine load or internal-combustion engine raises.
On the other hand, during internal-combustion engine output when further increase internal-combustion engine high loaded process, need in a certain specified time limit, spray more fuel.Therefore, in the present invention,, drive charged piston 17 and the increase jet pressure in order in a certain specified time limit, to spray fuel as much as possible.In addition, because the output torque of internal-combustion engine is big more, common rail pressure is high more, thereby in the present invention, when common rail pressure raises, utilizes charged piston 17 to produce the effect that increases jet pressure.Promptly, in the present invention, as shown in Figure 2, when the fuel pressure in the common rail 2 is in the high pressure side fuel region II that is higher than intended fuel pressure, drive charged piston 17, when the fuel pressure in the common rail 2 is in the low voltage side fuel region I that is lower than intended fuel pressure, with fuel pressure in the shared track 2 be in high pressure side fuel region II the time compare, weaken the pressurization of charged piston 17 or stop to drive charged piston 17.In Fig. 2, longitudinal axis TQ represents the output torque of internal-combustion engine, and transverse axis NE represents internal-combustion engine rotational speed.And, in order to drive charged piston 17, the fuel under high pressure in the medial compartment 20 must be discharged in the fuel drain passageway 28, discharge fuel under high pressure like this and cause energy loss.Thereby preferably, reduce the discharge capacity of this fuel under high pressure as far as possible.About this point, in the present invention, by in the low voltage side fuel region I of Fig. 2, stopping to drive the discharge capacity that charged piston 17 reduces fuel under high pressure.
Then, with reference to Fig. 3 (A), (B) first embodiment of medial compartment control valve 26 is described, wherein, when the fuel pressure in the common rail 2 is in high pressure side fuel region II shown in Figure 2, drive charged piston 17, when the fuel pressure in the common rail 2 is in low voltage side fuel region I shown in Figure 2, stop to drive charged piston 17.
With reference to Fig. 3 (A), medial compartment control valve 26, have valve chamber 30 cylindraceous, the valve body 31 that moves back and forth in valve chamber 30 and hyperbaric chamber 32, this hyperbaric chamber 32 is formed on the end face of axial direction of valve body 31, via linking to each other in high-pressure fuel path 27 and the shared track 2.On the outer circumferential face of the axial direction central part of valve body 31, form groove 33 in the form of a ring, valve body 31 is made of the first valve body 31a and the second valve body 31b, this the first valve body 31a and second valve body 31b space and interconnecting on its axial direction, and in the enterprising line slip of the inner peripheral surface of valve chamber 30.In this embodiment, the first valve body 31a is identical with the external diameter of the second valve body 31b.
Shown in Fig. 3 (A), hyperbaric chamber 32 is formed on the exterior edge face of the first valve body 31a, forms chamber, end 34 on the exterior edge face of the second valve body 31b.And, form chamber 35 between valve in the groove 33 between the first valve body 31a and the second valve body 31b.On the other hand, insert the spring members 36 to the 32 couples first valve body 31a in hyperbaric chamber and the second valve body 32b application of force in chamber, end 34, this chamber, end 34 links to each other with fuel drain passageway 28. Fuel distribution channel 25a and 25b linearly are provided with alignedly, form via fuel distribution channel 25a three-way valve side fuel flow-through opening 37 that links to each other with three-way valve 8 and the medial compartment side fuel flow-through opening 38 that links to each other with medial compartment 20 via fuel distribution channel 25b on the inner peripheral surface of valve chamber 30.
When the fuel pressure in the common rail 2 is in low voltage side fuel region I shown in Figure 2, shown in Fig. 3 (A), valve body 31 rises by the elastic force of spring members 36, and at this moment, three-way valve side fuel flow-through opening 37 and medial compartment side fuel flow-through opening 38 are sealed by the outer circumferential face of the second valve body 31b.That is, fuel distribution channel 25 is blocked by medial compartment control valve 26.Thereby this moment, stopping to drive charged piston 17, jet pressure is a common rail pressure.
With respect to this, when the fuel pressure in the common rail 2 is in high pressure side fuel region II shown in Figure 2, shown in Fig. 3 (B), valve body 31 is depressed by the elastic force that the common rail pressure in the hyperbaric chamber 32 overcomes spring members 36, and three-way valve side fuel flow-through opening 37 and medial compartment fuel flow-through opening 38 be chamber 35 inner openings between valve all.That is, medial compartment control valve 26 is opened the stream of fuel distribution channel 25 fully.Thereby this moment, when fuel distribution channel 14 being linked to each other with high-pressure fuel path 5 owing to stream switching effect by three-way valve 8, fuel under high pressure in the common rail 2 is admitted in the medial compartment 20, when fuel distribution channel 14 links to each other with fuel drain passageway 28, discharge the fuel under high pressure in the medial compartment 20, thereby charged piston 17 produces the increase effect.
In first embodiment shown in Figure 3, no matter valve body 31 is in the state shown in Fig. 3 (A) or is in the state shown in Fig. 3 (B), as long as in fuel distribution channel 25a, supply with the fuel under high pressure in the common rail 2, leak in the chamber, end 34 between the periphery that this fuel under high pressure will be by the second valve body 31b and the internal face of valve chamber 30, the fuel that leak in the chamber, end 34 are discharged in the fuel drain passageway 28.But, when being pre-formed the structure of this leakage fuel under high pressure, can increase the driving energy of high pressure fuel pump 4, thus unsatisfactory.Following embodiment represents can not take place the structure that fuel under high pressure is leaked.Wherein, in the following embodiments, the structure identical with structure shown in Figure 3 adopted same reference numerals.
Fig. 4 (A), (B) represent second embodiment.In this second embodiment, be with first embodiment's difference: leak in order to prevent the fuel under high pressure in the medial compartment control valve 26, chamber, end 34 links to each other with fuel distribution channel 25a via the fuel passage 40 of flowing path section less than fuel distribution channel 25a, 25b.In this second embodiment, though also be when the fuel pressure in the common rail 2 is in high pressure side fuel region II shown in Figure 2, to drive charged piston 17, when being in low voltage side fuel region I shown in Figure 2, the fuel pressure in the common rail 2 stops to drive charged piston 17, but owing to be provided with fuel passage 4, so the action of the valve body 31 when carrying out pressurization is different slightly with first embodiment.
That is, when the fuel pressure in the common rail 2 was in low voltage side fuel region I shown in Figure 2, shown in Fig. 4 (A), valve body 31 rose, and at this moment, utilizes the second valve body 31b to block fuel distribution channel 25a, 25b.In addition, when the stream switching effect by three-way valve 8 makes fuel pressure change in the fuel distribution channel 25a, though the yet change of fuel pressure in the chamber, end 34, the fuel pressure in the hyperbaric chamber 32 can be too not high, thereby valve body 31 remains on the lifting position shown in Fig. 4 (A).
On the other hand, when the fuel pressure in the common rail 2 was in high pressure side fuel region II shown in Figure 2, fuel pressure raise in the hyperbaric chamber 32.At this moment, when the stream switching effect by three-way valve 8 makes fuel distribution channel 25a link to each other with fuel under high pressure distribution channel 5, because the fuel pressures in the chamber, end 34 raise, thereby as Fig. 4 (A) shown in, valve body 31 risings.But in fact, little and because of the flow path area of fuel passage 40 because of the inertia of valve body 31, even fuel distribution channel 25a links to each other with fuel under high pressure distribution channel 5, valve body 31 can not rise immediately yet, but shown in Fig. 4 (B), medial compartment control valve 26 maintains the state that the stream of fuel distribution channel 25 is opened fully.Therefore, in the meantime, in medial compartment 20, supply with fuel under high pressure.
Then, when the stream switching effect by three-way valve 8 makes fuel distribution channel 25a link to each other with fuel drain passageway 28, because the decline of the fuel pressure in the chamber, end 34, thereby shown in Fig. 4 (B), valve body 31 descends, and medial compartment control valve 26 is opened the stream of fuel distribution channel 25 fully.Consequently, the fuel pressure in the medial compartment 20 reduces, and utilizes charged piston 17 to carry out pressurization.
Fig. 5 (A), (B) represent the 3rd embodiment.In first embodiment and second embodiment, owing to apply power upwards to valve body 31 by the elastic force of spring members 36, thereby, need large-scale, powerful spring members as spring members 36.In the 3rd embodiment, make the external diameter of the external diameter of the second valve body 31b less than the first valve body 31a, and make chamber, end 34 via high-pressure fuel path 41 and shared 2 interior linking to each other of track, making the fuel pressure in the chamber, end 34 is common rail pressure, owing to only make downward fuel pressure act on the sectional area part of the first valve body 31a and the second valve body 31b of valve body 31, so can adopt small-sized and weak spring members as spring members 36.In addition, in the 3rd embodiment, chamber 35 links to each other with fuel distribution channel 25a less than the fuel passage 42 of fuel distribution channel 25a all the time via flow path area between valve.
In the 3rd embodiment, similarly, when the fuel pressure in the common rail 2 was in low voltage side fuel region I shown in Figure 2, shown in Fig. 5 (A), valve body 31 rose, and at this moment, utilizes the second valve body 31b to block fuel distribution channel 25a, 25b.In addition, when the stream switching effect by three-way valve 8 makes fuel pressure change in the fuel distribution channel 25a, though the also change of fuel pressure between valve in the chamber 35, the fuel pressure in the hyperbaric chamber 32 is not too high, thereby valve body 31 remains on the lifting position shown in Fig. 5 (A).
On the other hand, when the fuel pressure in the common rail 2 was in high pressure side fuel region II shown in Figure 2, in the hyperbaric chamber 32 and chamber, end 34 interior fuel pressures raise.At this moment, when the stream switching effect by three-way valve 8 made fuel distribution channel 25a link to each other with fuel under high pressure distribution channel 5, because the fuel pressures in the chamber 35 are common rail pressure between valve, thereby as Fig. 5 (A) shown in, valve body 31 was by the elastic force rising of spring members 36.But in fact, because the inertia of valve body 31, even fuel distribution channel 25a links to each other with fuel under high pressure distribution channel 5, valve body 31 can not rise immediately yet, but shown in Fig. 5 (B), medial compartment control valve 26 maintains the state that the stream of fuel distribution channel 25 is opened fully.Therefore, in the meantime, in medial compartment 20, supply with fuel under high pressure.
Then, when the stream switching effect by three-way valve 8 makes fuel distribution channel 25a link to each other with fuel drain passageway 28, because the fuel pressure in the chamber 35 descends between valve, thereby shown in Fig. 5 (B), valve body 31 descends, and medial compartment control valve 26 is opened the stream of fuel distribution channel 25 fully.Consequently, the fuel pressure in the medial compartment 20 reduces, and utilizes charged piston 17 to carry out pressurization.
Fig. 6 represents the 4th embodiment.In the 4th embodiment, on the central axis of valve body 31, form fuel passage 43, via fuel passage 43 fuel under high pressure in the hyperbaric chamber 32 is sent in the chamber, end 34.In the 4th embodiment, because fuel under high pressure is sent in the chamber, end 34, thereby have the advantage that need in Fuelinjection nozzle 1, not form the high-pressure fuel path 41 shown in Fig. 5 (A), (B).And, because the path-length and the path-length between chamber, end 34 and the shared track 2 that can reduce between hyperbaric chamber 32 and the shared track 2 are poor, so when the pressure pulsation that produces in the common rail 2 propagates into when reaching in the chamber, end 34 in the hyperbaric chamber 32 in, the pressure pulsation that reaches in the chamber, end 34 in these hyperbaric chambers 32 can not produce phase difference, thereby can prevent valve body 31 vibrations.
Fig. 7 represents the 5th embodiment.In the 5th embodiment, similarly, in valve body 31, be formed for being communicated with the fuel passage 44 of hyperbaric chamber 32 and chamber, end 34, in this fuel passage 44, be formed with throttle valve 45.The travelling speed of valve body 31 is according to 32 determining to the travelling speed of the fuel in hyperbaric chamber 32 to the travelling speed of the fuel of chamber, end 34 or from chamber, end 34 from the hyperbaric chamber, for the travelling speed deviation of the valve body 31 between the Fuelinjection nozzle 1 of eliminating each cylinder, 32 to chamber, end 34 and necessary consistent to the fuel travelling speed in hyperbaric chamber 32 from chamber, end 34 from the hyperbaric chamber.In the 5th embodiment,, can make the travelling speed unanimity of each valve body 31 by forming throttle valve 45 with highi degree of accuracy.
And, in order to eliminate the travelling speed deviation of the valve body 31 between each Fuelinjection nozzle 1, in the embodiment shown in Fig. 5 (A), (B), can in each the high- pressure fuel path 27,41 that links to each other with hyperbaric chamber 32 and chamber, end 34, throttle valve 46,47 be set respectively as illustrated in fig. 8.
On the other hand, in the embodiment shown in Fig. 5 (A), (B), the establishing method of elastic force that can be by spring members 36 is set for, and along with common rail pressure increases, the pressurization of charged piston 17 strengthens.In this case, the driving of medial compartment control valve 26 is shown in Fig. 9 (A), (B) and Figure 10 (A), (B).That is, in this case, when the fuel pressure in the common rail 2 is in high pressure side area I II shown in Fig. 9 (A), the powerful charged piston 17 that drives; When the fuel pressure in the common rail 2 is in medium voltage side area I I shown in Fig. 9 (A), reduce the pressurization of charged piston 17; When the fuel pressure in the common rail 2 is in low voltage side area I shown in Fig. 9 (A), stop to drive charged piston 17.In Fig. 9 (A), similarly, TQ represents the output torque of internal-combustion engine, and NE represents internal-combustion engine rotational speed.
Promptly, when the fuel pressure in the common rail 2 is in low voltage side fuel region I shown in Fig. 9 (A), when being in low voltage side fuel region I shown in Figure 2 with fuel pressure in the common rail 2 in Fig. 5 (A), (B) illustrated embodiment in the same manner, shown in Fig. 9 (B), valve body 31 is risen, and stop to drive charged piston 17.
And, when the fuel pressure in the common rail 2 is in high pressure side fuel region III shown in Fig. 9 (A), when being in high pressure side fuel region II shown in Figure 2 with fuel pressure in the common rail 2 in Fig. 5 (A), (B) illustrated embodiment in the same manner, when fuel distribution channel 25a links to each other with fuel drain passageway 28, shown in Figure 10 (B), valve body 31 drops to extreme lower position.Consequently, the stream of fuel distribution channel 25a, 25b is opened fully, utilized charged piston 17 to carry out powerful pressurization.
In addition, when the fuel pressure in the common rail 2 is in medium voltage side fuel region II shown in Fig. 9 (A), when fuel distribution channel 25a links to each other with fuel drain passageway 28, shown in Figure 10 (A), the second valve body 31b of valve body 31 makes three-way valve side fuel flow-through opening 37 and medial compartment side fuel flow-through opening 38 open a part of opening.That is, along with the fuel pressure in the common rail 2 raises, the opening area of each fuel flow-through opening 37,38 of chamber 35 inner openings increases gradually between valve.When the opening area of each fuel flow-through opening 37,38 of 35 inner openings of chamber between valve increases, the pressurization of charged piston 17 strengthens, therefore, in the embodiment shown in Fig. 9 (A), (B) and Figure 10 (A), (B), along with the fuel pressure in the common rail 2 raises, the pressurization of charged piston 17 strengthens.
At Fig. 5 (A), (B) to the embodiment shown in Figure 10 (A), (B), when fuel distribution channel 25a links to each other with fuel under high pressure distribution channel 5, if in medial compartment 20, fully supply with before the fuel under high pressure, medial compartment control valve 26 promptly blocks fuel distribution channel 25, then might cause carrying out good pressurization.And, when common rail pressure reduces gradually, if under the state that the fuel under high pressure in medial compartment 20 is leaked, medial compartment control valve 26 has blocked fuel distribution channel 25, in the time of then might causing reaching the required common rail pressure of supercharging, before being full of fuel under high pressure, medial compartment 20 can not carry out pressurization.
Have under the situation of this possibility, as shown in figure 11, medial compartment 20 is got final product via linking to each other in the safety check 48 that can only circulate to medial compartment 20 in the common rail 2 and throttle valve 49 and the shared track 2.So, even because medial compartment control valve 26 blocks fuel distribution channel 25, medial compartment 20 also can be full of fuel under high pressure, thereby when reaching the common rail pressure that need increase to, can carry out pressurization reliably.
Making medial compartment 20, also can make medial compartment control valve 26 discharge the effect of the fuel under high pressure in the medial compartment 20 like this via under safety check 48 and the situation that shared track 2 links to each other.
And, be full of fuel under high pressure in order to make medial compartment 20, as shown in figure 12, chamber, end 34 is linked to each other with fuel distribution channel 25b or medial compartment 20 via the fuel passage 50 of flow path area less than fuel distribution channel 25b.So, because fill in medial compartment 20 after the fuel under high pressure, the fuel pressure in the chamber, end 34 rises, thereby before medial compartment 20 is full of fuel under high pressure, medial compartment control valve 26 does not block fuel distribution channel 25a, 25b, thereby can make medial compartment 20 be full of fuel under high pressure reliably.
Then, with reference to Figure 13 (A), (B) following embodiment is described, wherein, when the fuel pressure in the common rail 2 is in high pressure side fuel region II shown in Figure 2, drive charged piston 17, when the fuel pressure in the common rail 2 is in low voltage side fuel region I shown in Figure 2, when being in high pressure side fuel region II, fuel pressure in the shared track 2 compares, weaken the pressurization of charged piston 17.
In this embodiment, the fuel distribution channel 25b that links to each other with medial compartment 20 is communicated with in the chamber 35 all the time with between valve, and make the fuel distribution channel 25a that links to each other with three-way valve 8 via throttle valve 51 and bypass path 52 all the time with valve between 35 interior connections of chamber.That is, in this embodiment, when the fuel pressure in the common rail 2 was in low voltage side fuel region I shown in Figure 2, shown in Figure 13 (A), valve body 31 rose, and at this moment, utilized second valve body 31b sealing three-way valve side fuel flow-through opening 37.Thereby this moment, medial compartment 20 is linked to each other with fuel distribution channel 25a all the time via bypass path 52 and throttle valve 51, consequently, utilize charged piston 17 to carry out faint pressurization.
On the other hand, when the fuel pressure in the common rail 2 is in high pressure side fuel region II shown in Fig. 2 (A), when fuel distribution channel 25a linked to each other with fuel drain passageway 28, shown in Figure 13 (B), three-way valve side fuel flow-through opening 37 was opened in the chamber 35 between valve fully.Thereby this moment, carry out powerful pressurization.
Figure 14 (A), (B) are the variation of expression Figure 13 (A), (B) illustrated embodiment.In this variation, the external diameter of the second valve body 31b is greater than the external diameter of the first valve body 31a, and chamber, end 34 links to each other with fuel distribution channel 25a via the flow path area fuel passage 53 identical with fuel distribution channel 25a.In this embodiment, similarly, when the fuel pressure in the common rail 2 was in low voltage side fuel region I shown in Figure 2, shown in Figure 14 (A), valve body 31 rose, thereby carried out faint pressurization this moment.
On the other hand, when the fuel pressure in the common rail 2 was in high pressure side fuel region II shown in Figure 2, the fuel pressure in the hyperbaric chamber 32 raise.At this moment, when the stream switching effect by three-way valve 8 makes fuel distribution channel 25a link to each other with fuel under high pressure distribution channel 5, because the fuel pressures in the chamber, end 34 raise immediately, thereby as Figure 14 (A) shown in, valve body 31 risings.At this moment, in medial compartment 20, supply with fuel under high pressure via throttle valve 51 and bypass path 52.Then, when the stream switching effect by three-way valve 8 makes fuel distribution channel 25a link to each other with fuel drain passageway 28, because the fuel pressures in the chamber, end 34 raise immediately, thereby as Figure 14 (B) shown in, valve body 31 declines.Consequently, three-way valve side fuel flow-through opening 37 is opened in the chamber 35 between valve fully, thereby carries out powerful pressurization.
The Reference numeral list
2 common rail
5,19,23,27,41 high-pressure fuel paths
6 spray nozzle parts
7 boosters
8 triple valves
9 needle-valves
12 pressure controling chamber
14,25,25a, 25b fuel distribution channel
17 charged pistons
20 medial compartments
22 pumping chambers
24,48 check-valves
26 medial compartment control valves
28 fuel drain passageways
30 valve chambers
31 valve bodies
31a first valve body
31b second valve body
32 hyperbaric chambers
Chamber, 34 end
Chamber between 35 valves
36 spring members
37 three-way valve side fuel flow-through openings
38 medial compartment side fuel flow-through openings
40,42,43,44,50,53 fuel passage
Claims (13)
1. fuel injection device; The medial compartment of charged piston that is formed on the pressure controling chamber on the needle-valve inner end and be used for increases expulsion pressure via two position three-way valve optionally with shared track in or the fuel drain passageway link to each other; Be discharged to needle-valve is opened and burner oil by supplying to fuel under high pressure in the common rail in the described pressure controling chamber; Be discharged to and drive charged piston in the fuel drain passageway and increase fueling injection pressure by supplying to fuel under high pressure in the common rail in the described medial compartment; Wherein
Be used to be communicated with in the fuel distribution channel of described three-way valve and medial compartment the medial compartment control valve that configuration is driven by the fuel pressure in the common rail;
Described medial compartment control valve has valve chamber, the valve body that moves back and forth and hyperbaric chamber in valve chamber, this hyperbaric chamber is formed on the end face of axial direction of valve body, is used to import the fuel under high pressure in the common rail;
When the fuel pressure in the common rail changes and fuel pressure in this hyperbaric chamber is changed, described valve body moves on axial direction and the flow path area of fuel distribution channel is changed, thus, when the fuel pressure in the common rail is in the high pressure side fuel region that is higher than intended fuel pressure, described medial compartment control valve drives charged piston, when the fuel pressure in the common rail is in the low voltage side fuel region that is lower than intended fuel pressure, compare when being in this high pressure side fuel region with fuel pressure in the shared track, described medial compartment control valve weakens the pressurization of charged piston or stops to drive charged piston.
2. fuel injection system according to claim 1, wherein, described medial compartment control valve, when the fuel pressure in the common rail is in described high pressure side fuel region, when the switching effect by three-way valve makes the fuel distribution channel link to each other with the fuel drain passageway, the stream of this fuel distribution channel is opened fully; When the fuel pressure in the common rail is in described low voltage side fuel region, when the switching effect by three-way valve makes the fuel distribution channel link to each other with the fuel drain passageway, the stream that makes this fuel distribution channel circulates with the flow path area when opening fully, or blocks this fuel distribution channel.
3. fuel injection system according to claim 1, wherein, described valve body is made of first valve body and second valve body, and described first valve body and second valve body have mutually on its axial direction at interval and interconnect, and in the enterprising line slip of the inner peripheral surface of valve chamber; On the exterior edge face of first valve body, form described hyperbaric chamber, on the exterior edge face of second valve body, form the chamber, end, forming chamber between valve between first valve body and second valve body, on the inner peripheral surface of valve chamber, form via fuel distribution channel three-way valve side fuel flow-through opening that links to each other with three-way valve and the medial compartment side fuel flow-through opening that links to each other with medial compartment via the fuel distribution channel, these fuel flow-through openings are interconnected via chamber between valve, block the connected state of these fuel flow-through openings by at least one opening that utilizes second valve body to seal these fuel flow-through openings.
4. fuel injection system according to claim 3, wherein, described first valve body has identical external diameter with second valve body; In the indoor insertion in described end to described hyperbaric chamber the spring members to first valve body and the second valve body application of force; When the fuel pressure in the common rail is in described high pressure side fuel region, when the switching effect by three-way valve makes the fuel distribution channel link to each other with the fuel drain passageway, described fuel flow-through opening is interconnected via chamber between valve; When the fuel pressure in the common rail is in described low voltage side fuel region, when the switching effect by three-way valve makes the fuel distribution channel link to each other with the fuel drain passageway, utilize second valve body to seal described two fuel flow-through openings.
5. fuel injection system according to claim 3, wherein, the external diameter of first valve body is greater than second valve body; It is indoor that fuel under high pressure in the common rail is imported described end, and in the indoor insertion in this end to described hyperbaric chamber the spring members to first valve body and the second valve body application of force; When the fuel pressure in the common rail is in described high pressure side fuel region, when the switching effect by three-way valve makes the fuel distribution channel link to each other with the fuel drain passageway, described fuel flow-through opening is interconnected via chamber between valve; When the fuel pressure in the common rail is in described low voltage side fuel region, when the switching effect by three-way valve makes the fuel distribution channel link to each other with the fuel drain passageway, utilize second valve body to seal described two fuel flow-through openings.
6. fuel injection system according to claim 5 wherein, is formed for the fuel under high pressure in the hyperbaric chamber is sent into the indoor fuel passage in end in described first valve body and second valve body.
7. fuel injection system according to claim 6 wherein, is provided with throttle valve in described fuel passage.
8. fuel injection system according to claim 5 wherein, arrives in the high-pressure fuel path that arrives described hyperbaric chamber from common rail and from common rail in the high-pressure fuel path of chamber, described end and is provided with throttle valve respectively.
9. fuel injection system according to claim 5, wherein, rising along with the fuel pressure in the common rail, the opening area of each fuel flow-through opening of indoor opening increases gradually between valve, along with the rising of the fuel pressure in the common rail, the pressurization of charged piston strengthens thus.
10. fuel injection system according to claim 5 wherein, makes medial compartment link to each other with shared track via safety check and throttle valve, and described safety check control fuel can only circulate fuel from common rail to medial compartment.
11. fuel injection system according to claim 5 wherein, makes in chamber, described end and the fuel distribution channel that arrives from medial compartment side fuel flow-through opening in the medial compartment to link to each other.
12. fuel injection system according to claim 3, wherein, the external diameter of first valve body is greater than second valve body; It is indoor that fuel under high pressure in the common rail is imported to described end, and in the indoor configuration in this end to described hyperbaric chamber the spring members to first valve body and the second valve body application of force; The fuel distribution channel that arrives three-way valve from described three-way valve side fuel flow-through opening via flow path area less than this arrive from described three-way valve side fuel flow-through opening three-way valve the fuel distribution channel throttle valve all the time with valve between indoor the connection; Described medial compartment side fuel flow-through opening is chamber opening between valve all the time; When the fuel pressure in the common rail is in described high pressure side fuel region, when the switching effect by three-way valve makes the fuel distribution channel link to each other with the fuel drain passageway, make described three-way valve side fuel flow-through opening indoor opening and drive charged piston between valve; When the fuel pressure in the common rail is in described low voltage side fuel region, at least when the switching effect by three-way valve makes the fuel distribution channel link to each other with the fuel drain passageway, utilize second valve body sealing three-way valve side fuel flow-through opening, thereby compare when being in this high pressure side fuel region, weaken the pressurization of charged piston with common rail pressure.
13. fuel injection system according to claim 3, wherein, the external diameter of first valve body is less than second valve body, in the indoor configuration in described end to described hyperbaric chamber the spring members to first valve body and the second valve body application of force; The fuel distribution channel that arrives three-way valve from described three-way valve side fuel flow-through opening via flow path area less than this arrive from described three-way valve side fuel flow-through opening three-way valve the fuel distribution channel throttle valve all the time with valve between indoor the connection, and be communicated with chamber, described end; Make described medial compartment side fuel flow-through opening chamber opening between valve all the time; When the fuel pressure in the common rail is in described high pressure side fuel region, when the switching effect by three-way valve makes the fuel distribution channel link to each other with the fuel drain passageway, make three-way valve side fuel flow-through opening indoor opening and drive charged piston between valve; When the fuel pressure in the common rail is in described low voltage side fuel region, when the switching effect by three-way valve makes the fuel distribution channel link to each other with the fuel drain passageway, utilize second valve body sealing three-way valve side fuel flow-through opening, thereby compare when being in this high pressure side fuel region, weaken the pressurization of charged piston with common rail pressure.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP277112/2004 | 2004-09-24 | ||
| JP2004277112 | 2004-09-24 | ||
| JP030275/2005 | 2005-02-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1926323A CN1926323A (en) | 2007-03-07 |
| CN100467853C true CN100467853C (en) | 2009-03-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005800065147A Expired - Fee Related CN100467853C (en) | 2004-09-24 | 2005-09-22 | Fuel injection device |
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| Country | Link |
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| CN (1) | CN100467853C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4331225B2 (en) * | 2007-04-10 | 2009-09-16 | トヨタ自動車株式会社 | Fuel injection control device for internal combustion engine |
| WO2010104423A2 (en) * | 2009-03-13 | 2010-09-16 | Powercell Sweden Ab | Fuel injection system and method for injecting hydrocarbon fuel into a fuel reformer |
| CN104847512B (en) * | 2014-02-19 | 2019-09-06 | 卡特彼勒公司 | Control module for common-rail fuel injection |
| CN104847553A (en) * | 2015-04-09 | 2015-08-19 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Pressurization type common-rail fuel injector capable of optimizing fuel-injecting rate |
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2005
- 2005-09-22 CN CNB2005800065147A patent/CN100467853C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
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| CN1926323A (en) | 2007-03-07 |
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