EP2659124A1 - Druckspeichervorrichtung für ein kraftstoffeinspritzsystem - Google Patents
Druckspeichervorrichtung für ein kraftstoffeinspritzsystemInfo
- Publication number
- EP2659124A1 EP2659124A1 EP11778862.0A EP11778862A EP2659124A1 EP 2659124 A1 EP2659124 A1 EP 2659124A1 EP 11778862 A EP11778862 A EP 11778862A EP 2659124 A1 EP2659124 A1 EP 2659124A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- closure body
- sealing element
- housing
- fuel injection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 58
- 238000002347 injection Methods 0.000 title claims abstract description 35
- 239000007924 injection Substances 0.000 title claims abstract description 35
- 238000007789 sealing Methods 0.000 claims abstract description 71
- 238000003860 storage Methods 0.000 claims description 40
- 230000009471 action Effects 0.000 abstract description 3
- 238000002485 combustion reaction Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 208000031872 Body Remains Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
- F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
- F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
-
- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/004—Joints; Sealings
- F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
-
- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
Definitions
- the invention relates to a pressure storage device for a fuel injection system, comprising a housing in which a closure body limits a storage space which is expandable from a low pressure level prevailing therein to a high pressure level prevailing therein by moving the closure body.
- the pressure is generated by means of a pump, in particular a high-pressure pump, which is in particular mechanically driven by the internal combustion engine by means of a camshaft.
- the pump has a pressure chamber which is compressible by means of a piston in order to convey fuel from the pressure chamber into a pressure region, in particular a high-pressure region, from where the fuel is injected.
- An electromechanical, in particular electromagnetic quantity control valve controls the amount of fuel delivered by the high-pressure pump per delivery stroke into the high-pressure region, to a so-called rail.
- a motor control unit regulates the pressure in the pressure range to the desired level by means of the quantity control valve.
- an accumulator device for a fuel injection system with a housing in which a closure body has a storage space. is created, which is expandable from a low pressure level prevailing therein to a high pressure level prevailing therein by moving the closure body.
- a first sealing element and a second sealing element are provided such that at low pressure level the first sealing element and at high pressure level, the second sealing element acts fluid-tight. The fluid-sealing effect results in particular in cooperation with the closure body.
- an accumulator device or a pressure accumulator is provided with a seal by means of a first and a second sealing element.
- the pressure storage device is designed with a movable closure body which optionally interacts with one of the two sealing elements fluid-tight.
- the closure body moves between the two sealing positions within the pressure storage device, thereby allowing the expansion or compression of an associated storage space.
- such a seal closes the storage space separately, especially in those two positions in which the closure body interacts with the sealing elements.
- the closure body moves in dependence on the pressure level in the storage space and increases or decreases while the storage space. This allows fuel to be cached in memory space. By moving the closure body pressure oscillations are further reduced in the high pressure area, which relieves the remaining high pressure components.
- the sealing elements at the same time provide for an additional seal when the closure body occupies certain positions or positions. These are preferably those layers in which the closure body remains for a long time. As a result, only small pressure losses occur over these periods.
- Such an accumulator device is preferably used to maintain a minimum pressure in the high pressure region of a fuel injection system.
- an accumulator device is provided with the pressure drops, especially when large amounts of fuel injection, are avoided in the high pressure area. This makes it possible to use a comparatively small-volume rail in the high-pressure range.
- the present invention provides a particularly cost-effective pressure accumulator, without high demands on the fit between the closure body and a surrounding housing.
- the solution according to the invention is in contrast to accumulators whose closure body is designed as a membrane.
- a membrane has the disadvantage that it can become permeable or leaky over its lifetime and it has a certain residual permeability. Especially when used with fuel, which is an aggressive acting on many materials fluid, this behavior of a membrane may be detrimental.
- the pressure accumulator device according to the invention does not have this disadvantage, it is inexpensive to manufacture and sufficiently dense over the entire life.
- the first sealing element and / or the second sealing element are preferably in
- housing arranged such that at least one of the sealing elements forms a stop for the closure body.
- the seal is additionally supported by a pressing of the closure body to the sealing elements.
- the sealing elements are preferably designed elastically. A seal during existence of the high pressure level (high-pressure operation) is thus preferably made possible by the abutment of the closure body on the second sealing element. This results in a particularly low leakage during this operation with high system pressure
- a seal during existence of the low pressure level (standstill) is preferably made possible by contact of the closure body on the first sealing element.
- the combination with a small rail is an advantageous solution in particular. Undesirable pressure drops, which can occur with a small rail, are avoided by the pressure accumulator.
- the displacement of the closure body is thereby at least one
- Sealing element preferably limited by two sealing elements.
- the stop of the closure body thus also provides a defined positioning or position of the closure body and thus limits the change in volume of the storage space.
- the housing is preferably designed with a cylinder in which the closure body is slidably mounted as a piston.
- the shape of the closure body or the piston is preferably adapted to the inner shape of the housing. This creates a defined guiding situation for the closure body and a high degree of sealing, also during the movement of the closure body from one sealing element to the other.
- the cross-sectional area of the closure body and that of the housing are designed approximately equal.
- the closure body acts as a partition in the housing, which in the housing
- the pressure from the high-pressure region is applied to the end face of the closure body, in particular of the piston.
- the desired accumulator function can advantageously be influenced by a defined design of the front side in terms of their size and shape.
- a spring element is preferably provided, with which the closure body is biased in the direction of the storage space.
- the closure body is biased in the direction of a reduction of the storage space and thus in the direction of the high pressure area.
- the pressure in the high pressure area acts against this resilient bias. If the closure body at low pressure level in its rest position, it rests against the first sealing element and is at the same time pressed against this sealing element by means of the spring element.
- the spring element assists the sealing, since its biasing force acts on the first sealing element.
- the spring element acts as a counterforce during pressure accumulation on the pressure storage device and leads to a slow retraction of the closure body, while the pressure rises in the high pressure region.
- the spring element acts as a counterforce until the closure body comes to rest on the second stop, in particular the second sealing element.
- the spring element is preferably an elastic element, a spring, in particular a spiral spring or a gas space. Depending on the design of the spring (spring rate, material, dimensioning), its contact pressure can be adjusted to the closing body.
- the housing is preferably separated from the closure body into two spaces, of which a first space forms the storage space.
- the housing is adapted to be fluidly connected to the high pressure area of an associated fuel injection system, and the second space is adapted to be fluidly connected to the low pressure area of an associated fuel injection system to remove the leakage from the high pressure area.
- the high-pressure from the high-pressure region of the fuel injection system and, on the other hand, the low-pressure from its low-pressure region then act on the closure body.
- the low-pressure region is preferably connected to the second space via a throttle.
- the sealing elements are preferably arranged on the inner circumferential surface of the housing.
- the sealing elements are then easy to arrange and to hold stationary. This causes a good sealing effect when applying the designed in particular as a piston closure body to the correspondingly positioned sealing elements.
- the sealing elements are designed annular.
- the ring shape is inexpensive to manufacture, especially as a classic O-ring.
- the annular shape surrounds the inlet or outlet of the pressure storage device.
- the sealing element rings of this type are thus designed as a complete seal.
- the ring shape preferably extends radially outward near the piston circumference. This results in a large sealing surface, wherein only relatively small sealing forces are necessary for sealing.
- the ring shape of the sealing elements can be made relatively easily by injection molding or extrusion.
- the closure body is preferably in the applied state on at least one of the sealing elements with an edge region. This results in an improved seal by penetration of the edge region of the closure body in the preferably elastic sealing element.
- a pump of a fuel injection system in which an accumulator means as described above is integrated.
- the pump thus represents a particularly compact design and a separate tubing to the low pressure system can be avoided.
- the pressure accumulating device described above is preferably used in a fuel injection system. While in fuel systems without accumulator and especially at low rail volumes due to the cold start (eg - 30 ° C) very large injection quantity required and increasing in the cold modulus of elasticity of the fuel rail pressure would greatly reduce the pressure accumulator such a large Pressure drop through its fuel storage function. Performs in cold start at low pump speed after the pressure build on the
- the storage function only works with large injection quantities if the pressure would fall below the upper pressure level and thus could lead to disadvantages in atomization and mixture preparation.
- the pressure accumulator thus compensates for disadvantages such as, for example, a otherwise severe pressure drop of a small-volume rail, and makes it possible to use inexpensive small rails.
- disadvantages such as, for example, a otherwise severe pressure drop of a small-volume rail, and makes it possible to use inexpensive small rails.
- System pressure is built up by the pump.
- the storage volume between the lower and the upper stop is less than the amount that can promote the pump by a stroke. Therefore, the accumulator is filled in a maximum of one delivery stroke. Below and above the two pressure levels of the pressure accumulator, the pressure increase is due to the low rail pressure.
- the system pressure slowly drops due to the sum of all leaks in the high-pressure system.
- the pressure is initially above the upper pressure level, so that the pressure accumulator due to the upper sealing element or the upper seal provides no significant contribution to the total leakage and thus to pressure reduction.
- the upper pressure level is undershot, so that the piston no longer seals and increased leakage occurs over the piston gap. This causes the pressure to drop slightly faster, but only to the lower limit.
- the lower Sealing elements or the lower stop prevents rapid complete pressure reduction. In the lower stop in particular the piston clearance between piston and housing or cylinder has no effect on the total leakage and thus the further pressure drop.
- the seal at the upper stop ensures that, especially in modern start / stop systems, which require a quick restart of the internal combustion engine, a sufficiently high rail pressure during startup is present.
- the seal in the lower stop ensures that even after longer shutdown periods, ie not only in start / stop mode, there is still a certain minimum pressure and in the high pressure system neither air nor fuel vapor can form in the postheating phase, which makes a safe start difficult ( Hot / warm start).
- an accumulator device with only one sealing element or a seal is conceivable, so only a seal at the top or only at the bottom stop.
- the functionality of the pressure storage device is then possibly slightly lower, but this can be justified by lower costs.
- Fig. 1 is a hydraulic circuit diagram of a fuel injection system without pressure storage according to the prior art
- Fig. 2 is a hydraulic circuit diagram of a fuel injection system with an accumulator device according to the invention.
- a fuel injection system 10 is shown with a pump 12.
- the region on the suction side of the pump 12 is referred to as the low-pressure region and the region on the pressure-side of the pump 12 as the pressure region or high-pressure region.
- fuel is pumped from a tank 14 through an electric fuel pump 16 at a pressure of about 5 bar through a fuel filter 18 to a line 20.
- a pressure relief valve 22 may direct fuel from the fuel pump 16 back into the tank 14.
- a low pressure damper 24 is arranged on line 16.
- the amount of fuel that is delivered to the pump 12 is regulated by a quantity control valve 26.
- the pump 12 increases the pressure of this fuel up to about 200 bar, wherein the fuel is conveyed through a Raildrossel 44 in a rail 28. This high pressure defines the already mentioned high-pressure region on the pressure side of the pump 12. From the rail 28, the fuel can be injected via injection valves 30 into an internal combustion engine 32.
- the pressure generated by the pump 12 is partly too high for the desired injection, depending on the operating state of the internal combustion engine 32. Therefore, this overpressure of the pump 12 is derived from the high pressure area in the pump 12.
- On the pressure side of the pump 12 branches off from the high-pressure region from a return line 34, which leads back into the delivery chamber of the pump 12.
- a check valve 36 mounted on the pressure side of the pump 12 forms the outlet valve of the pump 12.
- the check valve 36 only opens at a certain pressure level and prevents fuel from flowing in the opposite direction to its delivery direction.
- Another, arranged in the return line 34 check valve 38 ensures as a pressure relief valve that only fuel is returned under pressure in the pump 12. Also, this check valve 38 opens only from a certain higher pressure level in the flow direction to the low pressure area.
- the amount of fuel delivered to the pump 12 can be metered by the quantity control valve 26, so that ideally the pump 12 does not generate excessive overpressure at all.
- the pumped amount of fuel is regulated via a comparatively complex electromechanical system.
- a high pressure sensor 40 measures the pressure applied there.
- a controller 42 receives the information regarding the rail pressure from the high pressure sensor 40 and processes it. According to the programming of the control unit 42, the quantity control valve 26 is adjusted. Thus, the quantity control valve 26 regulates the pumping stroke per pump 12. led fuel quantity due to the occurring and measured in the rail 24 fuel pressure.
- FIG. 2 an inventive fuel injection system 10 is shown, in which the fuel is also first pumped into the line 20 of the low pressure area.
- a check valve 36 On the pressure side of the pump 12, in the pressure range or high pressure region, a check valve 36 is arranged.
- the check valve 36 opens only from a certain pressure level and prevents fuel can flow opposite to the conveying direction. Subsequently, the fuel is due to the pump pressure of the pump 12, promoted by the Raildrossel 44, in the rail 28. From there, the fuel reaches the injection valves 30 and is also injected into the engine 32.
- the pressure storage device 48 comprises a housing 50, in which a closure body 52 is biased against the high pressure area with a spring element 54, preferably in the form of a helical spring. Alternatively, a bias of the closure body by means of gas pressure is possible.
- the closure body 52 is designed in the form of a piston and arranged movable or displaceable in the housing 50. In this case, the closure body 52 delimits a storage space 56.
- the storage space 56 is expandable or compressible or can be increased or decreased in volume when the closure body 52 is displaced due to the action of force against its bias in the housing 50. This variability of the volume of the storage space 56 enables a pressure storage function, which will be described later in more detail.
- first sealing element 58 and a second sealing element 60 are arranged in the housing 50. Viewed in the longitudinal direction of the housing 50, the first sealing element 58 is located below the closure body 52 in the storage space 56 with reference to FIG. 2. The second sealing element 60 is located above the closure body 52 in a space 62 in which the spring element 54 is arranged.
- the two sealing elements 58, 60 form a lower and an upper stop for the displaceable closure body 52.
- the sealing elements 58, 60 are designed annularly and arranged on the inner surface of the shell of the cylindrical housing 50.
- the ring shape of the same elastic sealing elements 58, 60 is easy to implement. They can be produced relatively easily by injection molding or extrusion.
- the pump 12 according to FIG. 2 also pressurizes the fuel under high pressure and passes it to the rail 28. If the pressure in the high-pressure region exceeds the lower pressure level of the pressure accumulator 48 due to pump delivery, the closure body 52 is pushed back and the volume of the storage space 56 increases. The fuel can thus escape in the storage space 56 and limits in this way the pressure increase in the high-pressure region.
- the pressure at the pump 12 on the pressure side is at least about 40 bar.
- the spring element 54 is designed such that it yields at this pressure of approximately 40 bar or a spring force corresponding to this pressure (lower pressure level).
- the upper pressure level of the pressure accumulator 48 is designed so that it is just below the usual pressure range at which the injection is operated in normal operation, for example about 50 bar. This ensures that no elevated leakage occurs at injection pressures above approx. 50 bar.
- the storage space 56 is configured to receive an amount of fuel needed for cold start injection. If the pressure ceases due to a cold start injection in the storage space 56, the closure body 52 moves back in the direction of its initial position on the first sealing element 58, thus pushing fuel in and thereby preventing excessive
- This space 62 is coupled by means of a line 66 to the low pressure area.
- a throttle 68 which is designed in the present case by means of a diaphragm. The function of this line and throttle arrangement is that the movement of the closure body 52 is damped, for example, to avoid natural oscillations of the mass-spring system (closure body 52, spring element 54).
- the design according to FIG. 2 can also be combined with partial aspects of the design according to FIG. 1.
- a quantity control valve 26 may be provided.
- FIG. 38 may be replaced by the pressure storage device 48.
- the electrically driven according to FIG. 2 pump 12 may be replaced by a mechanically driven pump 12 as shown in FIG. 1.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE201010064169 DE102010064169A1 (de) | 2010-12-27 | 2010-12-27 | Druckspeichervorrichtung für ein Kraftstoffeinspritzsystem |
| PCT/EP2011/069145 WO2012089365A1 (de) | 2010-12-27 | 2011-10-31 | Druckspeichervorrichtung für ein kraftstoffeinspritzsystem |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2659124A1 true EP2659124A1 (de) | 2013-11-06 |
| EP2659124B1 EP2659124B1 (de) | 2014-12-10 |
Family
ID=44906101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP11778862.0A Not-in-force EP2659124B1 (de) | 2010-12-27 | 2011-10-31 | Druckspeichervorrichtung für ein kraftstoffeinspritzsystem |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2659124B1 (de) |
| CN (1) | CN103299063B (de) |
| DE (1) | DE102010064169A1 (de) |
| WO (1) | WO2012089365A1 (de) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2114720U (zh) * | 1992-04-02 | 1992-09-02 | 北京理工大学 | 一种防冲击的隔离式活塞蓄能器 |
| US5487652A (en) * | 1993-03-05 | 1996-01-30 | Sgs-Thomson Microelectronics, Inc. | Fuel flow stabilizer |
| US5845621A (en) * | 1997-06-19 | 1998-12-08 | Siemens Automotive Corporation | Bellows pressure pulsation damper |
| JP2000257609A (ja) * | 1999-03-05 | 2000-09-19 | Kosmek Ltd | エアー抜き装置 |
| DE10350941A1 (de) * | 2003-10-31 | 2005-06-02 | Hydac Technology Gmbh | Vorrichtung zum Dämpfen von Druckstößen |
| DE102004055266A1 (de) * | 2004-11-17 | 2006-05-18 | Robert Bosch Gmbh | Kraftstoffeinspritzanlage mit mehreren Druckspeichern |
| JP4782030B2 (ja) * | 2007-01-31 | 2011-09-28 | 川崎重工業株式会社 | エンジンおよび該エンジンを備えた自動二輪車 |
| US7717077B2 (en) * | 2007-11-13 | 2010-05-18 | Gm Global Technology Operations, Inc. | Internal combustion engine starting system and method |
-
2010
- 2010-12-27 DE DE201010064169 patent/DE102010064169A1/de not_active Withdrawn
-
2011
- 2011-10-31 EP EP11778862.0A patent/EP2659124B1/de not_active Not-in-force
- 2011-10-31 WO PCT/EP2011/069145 patent/WO2012089365A1/de not_active Ceased
- 2011-10-31 CN CN201180063100.3A patent/CN103299063B/zh not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2012089365A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2659124B1 (de) | 2014-12-10 |
| DE102010064169A1 (de) | 2012-06-28 |
| CN103299063A (zh) | 2013-09-11 |
| CN103299063B (zh) | 2016-09-07 |
| WO2012089365A1 (de) | 2012-07-05 |
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