CN102213169B - High pressure common rail device with variable high pressure volume for high pressure common rail fuel system - Google Patents
High pressure common rail device with variable high pressure volume for high pressure common rail fuel system Download PDFInfo
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- CN102213169B CN102213169B CN2011101541805A CN201110154180A CN102213169B CN 102213169 B CN102213169 B CN 102213169B CN 2011101541805 A CN2011101541805 A CN 2011101541805A CN 201110154180 A CN201110154180 A CN 201110154180A CN 102213169 B CN102213169 B CN 102213169B
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Abstract
The invention relates to an elastic high pressure common rail device with variable high pressure volume for an engine high pressure common rail fuel system. The device provided by the invention comprises a high pressure common rail and an elastic seal cavity which is additionally arranged in the high pressure common rail, wherein the cavity is made from a material with the bulk modulus coefficient less than 1500 N/mm<2> and can be easy to compress, the cavity is processed into a saw tooth shape, the cavity is filled with seal fuel oil. On the one hand, when an engine needs the high pressure common rail fuel system to spray systemic circulation oil mass, the pressure of the high pressure fuel oil in the high pressure common rail is greater than the pressure in the elastic seal cavity, the volume of the elastic seal cavity is decreased due to extrusion, and the effective oil supply volume of the corresponding high pressure common rail is increased. On the other hand, when the engine is in a state of medium-low speed and medium-low load, the oil pressure in the high pressure common rail is reduced, the elastic seal cavity expands due to the interior high pressure effect, the effective oil supply volume of the high pressure common rail is decreased, and finally the high pressure common rail inner volume changes along with the oil-rail pressure.
Description
Technical field:
The present invention relates to high pressure common rail fuel injection system, relate in particular to the high-pressure common rail oil rail device in the high pressure common rail fuel injection system.
Technical background:
Require increasingly strict today, the important directions that the high pressure common rail electric-controlled oil spout technology of being good at Flexible Control is the diesel engines at present technical development in energy-conservation and environmental protection etc.High-pressure common-rail fuel system does not rely on engine speed and realizes high-pressure injection, and in course of injection, oily rail pressure remains unchanged, and can realize by multi-injection the adjusting of fuel injection rate, can access desirable jet law, satisfies the demand of complete machine.
High pressure oil rail in the high-pressure common-rail fuel system is the parts that connect high pressure oil pump and electric-controlled fuel injector, belong to the energy-storage travelling wave tube in the high-pressure common-rail fuel system, the stability that the size of its volume and internal structure are set up speed of response and pressure to the pressure of high pressure fuel all has very important significance.In general, the engine power of mating is larger, and then corresponding circulating fuel injection quantity is more, and therefore the high pressure oil rail volume of coupling is also larger.
Now the volume at the high pressure oil rail of usefulness is constant, is that the fuel delivery per cycle that the motor according to the maximum coupling needs designs.And motor real work operating mode comprises at a high speed large load and the little load of low speed, the desirable high pressure oil rail volume that the little load of low speed is corresponding is less, if the high pressure oil rail volume that therefore designs according to the largest loop fuel delivery will far surpass the volume that the low speed small load condition needs.Because the high pressure oil rail volume is immutable, will cause following problem: the high pressure oil rail volume that 1) mates according to the major cycle oil mass does not meet the requirement of operating mode under middle and slow speed of revolution and the medium and small load.The circulation oil mass that need to spray in the operating mode of middle low speed and medium and small load is less than the largest loop oil mass, and fuel pressure is also less in the corresponding high pressure oil rail simultaneously.And if the high pressure oil rail volume designs according to maximum volume, fuel pump will pump into more multiple fuel above eject request to be full of whole high pressure oil rail, at this moment pump into the energy that surpasses this part fuel oil that theoretical coupling high pressure oil rail volume needs and belong to power dissipation.2) in stage that the rail internal pressure of the operating mode high pressure oil rails such as startup is set up, if the high pressure oil rail volume is larger, oil pump need to just can pump into more fuel oil and enter high pressure oil rail the more time, the time of therefore setting up high-pressure in the high pressure oil rail is longer, the corresponding time that allows fuel oil to begin to spray increases, this must cause start-up course to lengthen, start simultaneously and start later idling operation in requisition for fuel injection amount all very little, the high pressure oil rail volume that matches does not need very large, if at this moment use the high pressure oil rail of little volume will satisfy the requirement of the cyclic spray oil mass of operating mode, be conducive to simultaneously the Rapid Establishment high pressure, realize the quick startup of motor.
Because each cylinder injector and same oily rail join, each oil sprayer can cause the fuel pressure in the oily rail pipe to produce in injection process and fluctuate, thereby affects the oil spout precision of self and other oil sprayer.The inner general drum-shaped smooth structure that adopts of high pressure oil rail does not have power-absorbing, thus high pressure oil rail physical arrangement can not realize absorbing vibration damping to the high pressure fuel pressure wave.
Summary of the invention:
Immutable and high pressure oil rail does not possess the deficiency of physical arrangement absorbing vibration damping for the high pressure oil rail volume that overcomes high-pressure common rail, the present invention is on the basis of original high pressure oil rail device, at elastic packing cavity of the inner increase of its high pressure oil rail, this cavity is fixed in the high pressure oil rail of high-pressure common rail.This elastic packing cavity is that the bulk modulus coefficient is made less than the material of 1500N/mm2 by under 80 ℃ of fuel oil temperatures, pressure 400bar condition, its sharp processing toothing, and inside cavity is full of fuel oil.Original device comprises rail pressure sensor 1, filler opening 2, pressure-limit valve 3, oil outlet 4 and high pressure oil rail 6, and oil outlet 4 is connected in high pressure oil rail 6.
The oily rail pressure of motor corresponding large high-pressure common rail under the operating mode of major cycle oil mass, therefore when motor needed the major cycle oil mass, the high pressure fuel pressure in the high pressure oil rail of high-pressure common-rail fuel system will be greater than the elastic packing cavity internal pressure.The elastic packing chamber is subject to external force compressive strain, and the cavity machinery volume in elastic packing chamber is dwindled; This moment, the mechanical volume in elastic packing chamber dwindled the fuel pressure raising that causes its inner sealing, it is large that the bulk modulus coefficient of fuel oil becomes, this part sealing fuel oil volume is further reduced, thereby so that the whole volume in elastic packing chamber further reduces, finally cause effective fuel feeding volume of high pressure oil rail to increase.Otherwise fuel pressure reduces in high pressure oil rail, and the suffered external pressure of elastic packing cavity reduces, and the elastic packing cavity expands under the internal oil pressure effect, realizes that the inner effectively fuel feeding volume of high pressure oil rail changes with the variation of oily rail pressure.
Unavoidably have pressure surge in the high pressure oil rail, but because the existence of elastic packing cavity, the pressure surge meeting will be by the absorbing of elastic packing cavity, thereby eliminates the pressure surge in the high pressure oil rail, keeps the pressure stability of high pressure oil rail.
Beneficial effect:
Adopt the present invention to realize that the high pressure oil rail internal volume changes with oily rail pressure, thereby the power dissipation when having avoided medium and small rotating speed and medium and small load realize that motor is in the quick startup of start operating performance.Simultaneously, because the elastic packing cavity volume changes along with the high pressure oil rail internal pressure, the fluctuation of high pressure oil rail internal pressure will be by the absorbing of elastic packing cavity, thereby eliminates the pressure surge in the high pressure oil rail, keeps the pressure stability of high pressure oil rail.
Description of drawings:
Fig. 1 is the structural representation of the high pressure oil rail of former high-pressure common-rail fuel system.
Fig. 2 is elastic packing cavity body structure schematic representation.
Structural representation when Fig. 3 is this device largest loop fuel delivery.
Fig. 4 is this structural representation when installing medium and small rotating speed and medium and small load.
Embodiment
Concrete technological scheme of the present invention is to be on the basis of original high pressure oil rail device in the present invention, increases an elastic packing cavity in its high pressure oil rail, and both are by being welded to connect.Be provided with rail pressure sensor on the high pressure oil rail, filler opening, pressure-limit valve and 6 oil outlets, fuel oil flows into high pressure oil rail by filler opening, and the pressure that automatical control system is measured in the high pressure oil rail by rail pressure sensor is big or small.For safety, when fuel pressure surpasses limit value, pressure-limit valve can be opened, and fuel oil will flow out high pressure oil rail.Fuel oil can flow out the oil sprayer that sprays into each cylinder by oil outlet.The structural representation of former high pressure oil rail device as shown in Figure 1.
The elastic packing cavity is made less than the metallic material of 1500N/mm2 by the bulk modulus coefficient, its sharp processing toothing, and inside cavity is full of fuel oil.Elastic packing cavity body structure schematic representation as shown in Figure 2, the assembling of elastic packing cavity and high pressure oil rail device is as shown in Figure 3.
When elastic packing cavity outside is barometric pressure, its cavity internal pressure is higher than the cavity external pressure, the elastic packing cavity just expands under internal high pressure, the machinery volume becomes large, the fuel pressure of sealing descends in its cavity simultaneously, and the bulk modulus coefficient of fuel oil will diminish, and sealing fuel oil volume becomes large, thereby so that the whole volume in elastic packing chamber becomes large, be the maximum volume of elastic packing cavity this moment.
When motor is in the largest loop fuel delivery, corresponding high pressure oil rail pressure is maximum, the interior pressure of high pressure oil rail this moment will be greater than the pressure in the elastic packing cavity, the elastic packing cavity is squeezed, the on the one hand stressed increase of elastic packing chamber cavity, the compressed distortion of material, the mechanical volume of elastic packing chamber cavity dwindles, the fuel pressure of sealing is enhanced in the cavity simultaneously, it is large that the bulk modulus coefficient of fuel oil becomes, therefore this part sealing fuel oil volume also can reduce, and both actings in conjunction increase effective fuel feeding volume of high pressure oil rail so that the whole volume in elastic packing chamber reduces.As shown in Figure 3.
Otherwise, when engine operation during at middle and slow speed of revolution and medium and small load, fuel delivery per cycle is less than the largest loop fuel delivery, the high pressure oil rail internal pressure reduces, less than the Seal cage cavity internal pressure, the external pressure that the elastic packing cavity is subject to reduces, the elastic packing cavity expands under the internal high pressure effect, the machinery volume becomes large, the fuel pressure of sealing descends in the cavity simultaneously, and the bulk modulus coefficient of fuel oil diminishes, and it is large that the fuel oil volume becomes, thereby so that the whole volume in elastic packing chamber becomes large, the corresponding effective fuel feeding volume of high pressure oil rail reduces.As shown in Figure 4.
In a word, in the high pressure oil rail effectively the fuel feeding volume large at the needs fuel delivery per cycle, become large when high pressure oil rail pressure is large, hour diminish at little, the oily rail pressure of needs fuel delivery per cycle, realized that the high pressure oil rail internal volume changes with the change of high pressure oil rail pressure, thereby the power dissipation when having avoided medium and small rotating speed and medium and small load realizes the quick startup of motor when start operating performance.Simultaneously, owing to the change of elastic packing cavity volume along with the high pressure oil rail internal pressure changes, the pressure surge in the high pressure oil rail will be absorbed by the elastic packing cavity, thereby eliminates the pressure surge in the high pressure oil rail, keeps the pressure stability in the high pressure oil rail.
Claims (2)
1. the high pressure oil rail device of the high-pressure common-rail fuel system of a variable high pressure volume, comprise rail pressure sensor (1), filler opening (2), pressure-limit valve (3), oil outlet (4), high pressure oil rail (6), oil outlet (4) is connected in high pressure oil rail (6), it is characterized in that: also be provided with the elastic packing cavity (5) of being made less than the material of 1500N/mm2 by the bulk modulus coefficient in high pressure oil rail (6) inside, elastic packing cavity (5) is fixedly connected with high pressure oil rail (6), sealing fuel oil in the elastic packing cavity (5).
2. the high pressure oil rail device of the high-pressure common-rail fuel system of a kind of variable high pressure volume according to claim 1, it is characterized in that: the profile of elastic packing cavity (5) is zigzag fashion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101541805A CN102213169B (en) | 2011-06-09 | 2011-06-09 | High pressure common rail device with variable high pressure volume for high pressure common rail fuel system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101541805A CN102213169B (en) | 2011-06-09 | 2011-06-09 | High pressure common rail device with variable high pressure volume for high pressure common rail fuel system |
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| Publication Number | Publication Date |
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| CN102213169A CN102213169A (en) | 2011-10-12 |
| CN102213169B true CN102213169B (en) | 2013-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011101541805A Expired - Fee Related CN102213169B (en) | 2011-06-09 | 2011-06-09 | High pressure common rail device with variable high pressure volume for high pressure common rail fuel system |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103696890A (en) * | 2014-01-10 | 2014-04-02 | 中山职业技术学院 | High-pressure common rail pipe |
| CN106812645A (en) * | 2015-11-27 | 2017-06-09 | 上海汽车集团股份有限公司 | Vehicle and its in-cylinder direct fuel-injection engine, fuel oil supply system, oily rail |
| CN107191283A (en) * | 2017-06-30 | 2017-09-22 | 北京工业大学 | A kind of rail pressure control algorithm of diesel high pressure common rail fuel system |
| CN112555078A (en) * | 2020-12-28 | 2021-03-26 | 福建省搜果智能科技有限公司 | Device for improving energy-saving and emission-reducing effects of automobile engine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030106535A1 (en) * | 2001-12-12 | 2003-06-12 | Zdroik Michael J. | Fuel rail pulse damper |
| CN1512053A (en) * | 2002-11-15 | 2004-07-14 | 株式会社电装 | Accumulation type fuel jet system |
| DE102004037133A1 (en) * | 2004-07-30 | 2006-03-23 | Robert Bosch Gmbh | Common rail fuel injection system especially for IC engine has pressure pulse damping inserts inside the rail |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1030521A (en) * | 1996-07-12 | 1998-02-03 | Denso Corp | Fuel injector |
| JP4230100B2 (en) * | 2000-08-17 | 2009-02-25 | 三桜工業株式会社 | Fuel rail |
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2011
- 2011-06-09 CN CN2011101541805A patent/CN102213169B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030106535A1 (en) * | 2001-12-12 | 2003-06-12 | Zdroik Michael J. | Fuel rail pulse damper |
| CN1512053A (en) * | 2002-11-15 | 2004-07-14 | 株式会社电装 | Accumulation type fuel jet system |
| DE102004037133A1 (en) * | 2004-07-30 | 2006-03-23 | Robert Bosch Gmbh | Common rail fuel injection system especially for IC engine has pressure pulse damping inserts inside the rail |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2002-61552A 2002.02.28 |
| JP特开平10-30521A 1998.02.03 |
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