Source: https://patents.google.com/patent/DE102007021327A1/en
Timestamp: 2020-08-13 00:22:49
Document Index: 577356253

Matched Legal Cases: ['art 54', 'art 56', 'art 56', 'art 54', 'art 56', 'art 54', 'art 54', 'art 54', 'art 56']

DE102007021327A1 - Fuel injection system with pressure boost - Google Patents
Fuel injection system with pressure boost
DE102007021327A1
DE102007021327A1 DE200710021327 DE102007021327A DE102007021327A1 DE 102007021327 A1 DE102007021327 A1 DE 102007021327A1 DE 200710021327 DE200710021327 DE 200710021327 DE 102007021327 A DE102007021327 A DE 102007021327A DE 102007021327 A1 DE102007021327 A1 DE 102007021327A1
DE200710021327
Dominik Kuhnke
2007-05-07 Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
2007-05-07 Priority to DE200710021327 priority Critical patent/DE102007021327A1/en
2008-11-13 Publication of DE102007021327A1 publication Critical patent/DE102007021327A1/en
239000000446 fuels Substances 0.000 title claims abstract description 69
239000007924 injections Substances 0.000 title claims abstract description 39
238000002347 injection Methods 0.000 title claims abstract description 35
238000002485 combustion reactions Methods 0.000 claims abstract description 7
A fuel injection system for an internal combustion engine having a high-pressure pump (14), a high-pressure accumulator (18), a plurality of fuel injectors (20), a hydraulic pressure intensifier (10) and a switching valve (26) for actuating the hydraulic booster (10) is proposed , wherein the hydraulic pressure booster (10) is provided centrally for all fuel injectors (20). The central hydraulic pressure booster (10) is arranged between the high pressure pump (14) and the high pressure accumulator (18).
The The invention relates to a fuel injection system with pressure boosting for internal combustion engines according to the preamble of the claim 1.
A fuel injection system with pressure boosting, in which a central hydraulic pressure booster is provided for all fuel injectors, is out EP 1 125 046 B1 known. In this case, the fuel delivered by means of a high pressure pump is fed to a central pressure accumulator (first common rail). The central pressure booster is connected downstream of the central pressure accumulator in the conveying direction of the fuel and supplies the pressure-intensified fuel to a further pressure accumulator (second common rail), from which several, corresponding to the number of injectors discharge pressure lines to the individual fuel injectors.
Out EP 1 123 463 B1 Another fuel injection system with pressure boosting is known. A central hydraulic pressure booster for all fuel injectors is arranged in a bypass line parallel to a pressure line which leads from the high-pressure pump to a distributor device, which in turn distributes the fuel to the individual fuel injectors. However, the distribution device has no accumulator function. The parallel-connected central pressure booster is connected between the high pressure pump and distributor.
adversely in the known pressure booster systems is the high Component part requirement and the relatively large amount of tax to Control of the pressure amplifier. Will be smaller for multiple injections Injection quantities requires a translated injection pressure, is the control chamber or differential pressure chamber of the pressure booster to relieve with each injection. This results in a big one tax amount to be deducted, thus the amount of loss in the injection system attributable to. Multiple injections as part of a cylinder stroke movement are also possible in time only within a narrow window, because with each control of the pressure booster whose Differential pressure room must refill with fuel. Furthermore increases with increasing injection pressures the Loss amount proportional to the fourth power across the gap width in the lead of the pressure intensifier piston, what the hydraulic efficiency of such fuel injectors negative affected.
task The present invention is the component and space requirements as well as the control amount for controlling the pressure booster to minimize, thus the efficiency of the pressure gain of the fuel injection system.
The The object of the invention is with the characterizing measures of claim 1. The invention Fuel injection system is due to the space requirements for optimized individual system components. Due to a modular Construction of high-pressure pump, pressure booster, high-pressure accumulator and fuel injector can be the inventive Fuel injection system on all known installation spaces use of internal combustion engines, for example in the cylinder head area. By the arrangement of the central hydraulic booster between high-pressure pump and high-pressure accumulator (common rail) is the central pressure booster per injection cycle one Fuel injector only once to control. This will cause the tax amount and the leakage amount depending on the number of Injections significantly reduced. Because of this circumstance can also the high-pressure pump are designed smaller sized, because less fuel is required, as the number of Refilling phases of the control room of the central hydraulic Pressure booster is significantly reduced. The central one Pressure booster can thereby in its high pressure flow to the maximum possible injection quantity of at least one fuel injector be interpreted.
By The measures of the subclaims are advantageous Further developments of the invention possible.
One compact space is advantageously achieved by, if the central hydraulic pressure booster a basic body in which a hydraulic storage space is formed, and if the hydraulic storage space via a pressure booster inlet directly connected hydraulically to the high pressure pump. Is to formed in the main body, a high pressure chamber and a control room and a pressure booster piston guided axially movable. The pressure booster piston acts on the high-pressure chamber Pressure boost and on the control room to control of the pressure intensifier. The hydraulic storage room is filled directly from the high-pressure pump. The volume of the hydraulic storage space is designed so that the Pressure drop is reduced and the pressure oscillations from the pump delivery damped to a tolerable for the pressure gain level become.
It is further provided that leads from the high-pressure chamber, a first hydraulic connection as a high pressure drain to the high-pressure accumulator and a second hydraulic connection in the hydraulic storage space that the first hydraulic connection to the high-pressure drain a first check valve and the second hydraulic connection has a second check valve, and that the first check valve blocks a return flow from the high pressure accumulator into the high pressure space and the second check valve prevents an inflow of the pressure translated fuel from the high pressure space into the hydraulic accumulator space.
The leakage losses that occur on the pressurized control piston on the pressure translator piston can be reduced thereby, if the central hydraulic booster, the pressure booster piston with a first pressure booster piston part with a larger diameter D 21 and with a second booster piston part with a smaller diameter D 22 executed is, is performed with at least one of the pressure booster piston parts in a formed on the body piston guide body. The piston guide body is at least partially surrounded by an annular space, which is part of the hydraulic storage space. As a result, at least one pressure intensifier piston part is also surrounded by the pressure in the hydraulic storage space. By this measure, the guides of the pressure booster piston are acted upon from the outside at the time of pressure amplification by a support pressure, so that the guide game due to the high internal pressure, which prevails within the high-pressure chamber, less dilated. It is most expedient if the high-pressure chamber with its guide gap for the pressure intensifier piston directly adjacent to the hydraulic storage space. As a result, the loss of leakage from the high-pressure chamber into the medium-pressure hydraulic storage space is low, because the medium pressure is the fuel pressure delivered by the high-pressure pump.
Conveniently, the central hydraulic booster is the switching valve assigned, wherein the switching valve also in the main body can be integrated. Furthermore, a filling line provided, which branches off from the hydraulic storage space and over which the control chamber and / or the high-pressure chamber after the pressure translation phase be refilled.
at Injection pressures below the maximum delivery pressure the high-pressure pump is in a first switching position of the switching valve the pressure in the storage space of the high-pressure pump via the inlet continue through check valves on the high pressure drain promoted to the high-pressure accumulator. From there, the fuel gets to the fuel injectors. During this operation is the central pressure booster is not activated, so that the pumped by the high-pressure pump fuel in bypass mode the pressure booster to the high pressure accumulator (common rail) arrives.
are Injection pressures required, which are above the maximum delivery pressure The high-pressure pump are the central Duck amplifier head for. This is the switching valve, which is a 3/2-way valve is electrically, hydraulically or pneumatically actuated brought into a second switching position. In this second switching position is the control chamber of the pressure booster for pressure relief via the switching valve with a pressure booster return connected.
Based In the drawings, the invention will be described below in more detail.
1 a system structure of the present invention proposed fuel injection system and
2 a basic structure of a hydraulic pressure booster.
This in 1 illustrated fuel injection system includes a fuel tank 12 from which via a high pressure pump 14 Fuel is conveyed to a central hydraulic pressure booster 10 is forwarded. The central pressure booster 10 is via a pressure booster inlet 44 on the one hand with the already mentioned high-pressure pump 14 on the other hand connected and acted on a high-pressure accumulator 18 (Common rail). In high pressure storage 18 are located in a number of fuel injectors to be supplied with fuel under system pressure corresponding number of connecting lines to fuel injectors 20 , which in the illustration according to 1 are indicated only schematically. At the combustion chamber end of the fuel injectors fuel under high pressure - indicated by the arrows - injected into the combustion chamber of a self-igniting internal combustion engine. Return side be found on the fuel injector 20 an injector return 22 in which a pressure booster return 24 which is connected to a switching valve 26 connected, opens. Both the pressure booster return 24 as well as the injector return 22 set the low pressure side of the fuel injection system as shown in 1 in which the diverted amount, be it control amount or leakage amount, into the fuel tank 12 is promoted back.
Due to the arrangement of the central pressure booster 16 between the high pressure pump 14 and the high pressure accumulator 18 is the pressure booster 16 per injection cycle of a fuel injector 20 only once with the switching valve 26 head for. Thereby, the control or leakage amount depending on the number of injections he considerably reduced. The high pressure pump 14 has less fuel to deliver and can be made smaller. The pressure amplifier 16 is in its high pressure delivery to the maximum possible injection amount of at least one of the fuel injectors 20 interpreted.
The central pressure booster 16 according to 2 includes a main body 30 , which can be constructed in one or more parts. In the main body 30 is a hydraulic storage room 48 integrated. The hydraulic storage room 48 is via the pressure booster inlet 44 from the high pressure pump 14 fueled. The storage volume of the hydraulic storage space 48 is designed so that the pressure drop is reduced and pressure oscillations resulting from the delivery of the high pressure pump 14 allow to dampen to a tolerable level for pressure amplification.
The central pressure booster 16 further comprises a pressure booster piston 32 , This in turn comprises a first piston portion with a first pressure booster piston part 54 , designed in diameter D 21 , and a second piston portion with a second pressure booster piston part 56 , designed in diameter D 22 . The pressure transmission ratio i of the pressure intensifier 16 according to the in 2 illustrated schematic results to: i = D 21 2 / (D 21 2 - D 22 2 )
The central pressure booster 10 also includes a high pressure room 50 for pressure amplification or pressure transmission and a control room 52 for controlling the pressure booster 16 , The pressure intensifier piston 32 is with a second pressure surface on the second pressure booster piston part 56 with the smaller diameter D 22 the control room 52 and with a first pressure surface on the first pressure intensifier piston part 54 with the larger diameter D 21 the high-pressure chamber 50 exposed.
The pressure intensifier piston 32 is by a return spring 34 acted on the piston guide body 36 on the one hand and on the pressure booster piston part 56 trained bunch 33 supported on the other hand. The pressure intensifier piston 32 , the return spring 34 and the piston guide body 36 are in turn so in storage space 48 arranged that this the piston guide body 36 in the area of the guidance of the pressure intensifier piston 32 surrounds, expediently in the region of the formed with the diameter D 21 first pressure booster piston part 54 , By this measure, the guides of the pressure booster piston 32 from the outside at the time of pressure boosting applied by a support pressure. This support pressure from outside causes due to the inside of the booster 16 Ruling pressure enlarged guide game less far expands, which would otherwise lead to an undesirable leakage of pilot leakage, which in turn the hydraulic efficiency of the booster 16 would adversely affect.
From the high pressure room 50 branches a first hydraulic line as high pressure drain 46 off to the high-pressure accumulator 18 (Common rail) extends. In the high pressure drain 46 there is a first check valve 40 , From the high pressure room 50 Furthermore, a second hydraulic line extends to a second check valve 38 that have a filling line 58 in the hydraulic storage room 48 leads. The check valve 38 serves as a filling valve. The first check valve 40 blocks a return flow of fuel from the high-pressure accumulator 18 in the high pressure room 50 , The second check valve 38 blocks an inflow of the pressure-translated fuel from the high-pressure chamber 50 in the hydraulic storage room 48 , From the second hydraulic line branches off another hydraulic line, which is the switching valve 26 leads. Another hydraulic line connects another port of the switching valve 26 with the control room 52 , About these hydraulic lines is the high-pressure chamber 50 and the control room 52 starting from the storage space 48 refilled with fuel, refilling the control room 52 after the pressure relief on actuation of the switching valve 26 via the further line in the illustrated switching position of the switching valve 26 also over the filling line 58 from the storage room 48 outgoing.
The return spring 34 between the guide body 36 and one step on the pressure intensifier piston 32 is arranged, presses the pressure booster piston 32 in its starting position, so that this with a stop limit 42 at the base body 30 is applied.
The spring force of the return spring 34 is designed so that the pressure booster piston 32 After the pressure boost at sufficiently high speed back to the starting position at the stop limit 42 is brought.
At injection pressures below the maximum delivery pressure of the high pressure pump 14 is according to a in 1 and 2 shown first switching position of the switching valve 26 the pressure of the high pressure pump 14 via the pressure intensifier inlet 44 in the storage room 48 and from there on via the designed as a check valve high pressure valve 40 over the high pressure drain 46 to the high-pressure accumulator 18 promoted. From there, the fuel reaches the system under pressure Fuel to be supplied fuel injectors 20 , The from the high pressure pump 14 compressed fuel thus passes in the so-called bypass operation of the high-pressure pump 14 directly to the high-pressure accumulator 18 (Common rail), ie the pressure booster 16 is not active in this operating mode.
To injection pressures above the maximum delivery pressure of the high pressure pump 14 to reach, is the pressure booster 16 head for. This is the switching valve 26 brought electrically, hydraulically or pneumatically in the second switching position. In this switching position of the switching valve 26 becomes the control room 52 with the booster return 24 connected. Fuel flows out of the pressure-relieved control chamber 52 via the switching valve 26 into the pressure booster return 24 from and to the in 1 illustrated low-pressure region of the fuel injection system back into the fuel tank 12 , Due to the pressure drop in the control room 52 becomes the pressure booster piston 32 against the spring force of the return spring 34 moved axially, so that the first pressure booster piston part 54 , formed in the diameter D 21 , in the high-pressure chamber 50 press and there increases the pressure. The check valve 38 turn is in the direction of the pressure booster return 24 closed. If the pressure in the high-pressure chamber rises 50 about the pressure on the side of the high pressure drain 46 towards, the compressed fuel is through the high pressure valve 40 further into the high-pressure accumulator 18 (Common rail) promoted. The high-pressure accumulator 18 Thus, with the increased pressure from the high pressure chamber 50 filled. From there then the fuel injectors 20 subjected to the increased fuel pressure, so that the injection via the fuel injectors with the above the delivery pressure of the high pressure pump 14 lying fuel pressure takes place. The pressure in the high pressure room 50 increases until a new equilibrium of forces occurs in the pressure intensifier piston 32 established.
When deactivating the switching valve 26 becomes the control room 52 again with the storage space 48 hydraulically connected. Due to this hydraulic connection, the pressure in the control room increases 52 on and the intensifier piston 32 terminates the process of pressure translation according to the pressure transmission ratio i in the high-pressure chamber 50 , At the same time, the high pressure valve closes 40 due to the upcoming pressure difference. The spring force of the return spring 34 Now press the pressure intensifier piston 32 with the stop limit 42 to the body 30 of the pressure booster 16 , During this time, fuel will leak out of the storage space 48 over the check valve 38 in the high pressure room 50 sucked. Is the pressure intensifier piston 32 at the stop limit 42 arrived, the switching valve 26 be controlled for renewed pressure translation. Before reaching the stop limit 42 although a renewed control is possible, but due to the then still undetermined reset position of a first pressure booster piston part 54 and a second pressure booster piston part 56 having pressure intensifier piston 32 not useful.
- EP 1125046 B1 [0002]
- EP 1123463 B1 [0003]
Fuel injection system for an internal combustion engine with a high-pressure pump ( 14 ) a high-pressure accumulator ( 18 ), a plurality of fuel injectors ( 20 ), a hydraulic pressure booster ( 10 ) and with a switching valve ( 26 ) for controlling the hydraulic booster ( 10 ), wherein the hydraulic pressure booster ( 10 ) central to all fuel injectors ( 20 ), characterized in that the central hydraulic pressure booster ( 10 ) between the high pressure pump ( 14 ) and the high-pressure accumulator ( 18 ) is arranged.
Fuel injection system according to claim 1, characterized in that the central hydraulic pressure booster ( 10 ) a basic body ( 30 ), in which a hydraulic storage space ( 48 ) is formed, and that the hydraulic storage space ( 48 ) via a pressure booster inlet ( 44 ) directly with the high-pressure pump ( 14 ) is hydraulically connected.
Fuel injection system according to claim 2, characterized in that in the basic body ( 30 ) a high pressure room ( 50 ) and a control room ( 52 ) and a pressure booster piston ( 32 ) are guided axially movable, and that the pressure booster piston ( 32 ) on the high-pressure chamber ( 50 ) for pressure boosting and on the control room ( 52 ) to control the pressure booster ( 16 ) acts.
Fuel injection system according to claim 2 or 3, characterized in that from the high-pressure chamber ( 50 ) a first hydraulic connection as a high-pressure outlet ( 46 ) to the high-pressure accumulator ( 18 ) and a second hydraulic connection in the hydraulic storage space ( 48 ) leads that the first hydraulic connection with the high pressure drain ( 46 ) a first check valve ( 40 ) and the second hydraulic connection a second check valve ( 38 ), and that the first check valve ( 40 ) a return flow from the high pressure accumulator ( 18 ) in the high-pressure chamber ( 50 ) and the second check valve ( 38 ) an inflow of the pressure-translated fuel from the high-pressure chamber ( 50 ) in the hydraulic storage space ( 48 ) locks.
Fuel injection system according to claim 2, characterized in that the central hydraulic pressure booster ( 10 ) in the main body ( 30 ) the switching valve ( 26 ) assigned.
Fuel injection system according to claim 2, characterized in that the pressure intensifier piston ( 32 ) with a first intensifier piston part ( 54 ) with a larger diameter D 21 and with a second intensifier piston part ( 56 ) is designed with a smaller diameter D 22 , that the main body ( 30 ) a piston guide body ( 36 ) for at least one of the intensifier piston parts ( 54 . 56 ), and that the piston guide body ( 36 ) is at least partially surrounded by an annulus, which part of the hydraulic storage space ( 48 ).
Fuel injection system according to one of the preceding claims, characterized in that a filling line ( 58 ) is provided, which from the hydraulic storage space ( 48 ) branches off and over which the control room ( 52 ) and / or the high-pressure chamber ( 50 ) are refilled after the pressure translation phase.
Fuel injection system according to one of the preceding claims, characterized in that the pressure booster ( 16 ) at pressures below the maximum delivery pressure of the high pressure pump ( 14 ) is inactive and the maximum delivery pressure of the high pressure pump ( 14 ) the high-pressure accumulator ( 18 ) about the storage volume ( 48 ), the check valves ( 38 . 40 ) and a high-pressure inlet ( 46 ).
Fuel injection system according to one of the preceding claims, characterized in that the pressure booster ( 16 ) at conveyed pressures above the maximum delivery pressure of the high pressure pump ( 14 ) is activated and whose control room ( 52 ) for pressure relief via the switching valve ( 26 ) with a pressure booster return ( 24 ) connected is.
DE200710021327 2007-05-07 2007-05-07 Fuel injection system with pressure boost Withdrawn DE102007021327A1 (en)
DE200710021327 DE102007021327A1 (en) 2007-05-07 2007-05-07 Fuel injection system with pressure boost
PCT/EP2008/054464 WO2008135339A1 (en) 2007-05-07 2008-04-14 Fuel injection system having pressure boosting system
EP20080736169 EP2147207B1 (en) 2007-05-07 2008-04-14 Fuel injection system having pressure boosting system
US12/599,402 US8245694B2 (en) 2007-05-07 2008-04-14 Fuel injection system with pressure boosting
DE102007021327A1 true DE102007021327A1 (en) 2008-11-13
ID=39691331
DE200710021327 Withdrawn DE102007021327A1 (en) 2007-05-07 2007-05-07 Fuel injection system with pressure boost
US (1) US8245694B2 (en)
EP (1) EP2147207B1 (en)
DE (1) DE102007021327A1 (en)
WO (1) WO2008135339A1 (en)
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2007-05-07 DE DE200710021327 patent/DE102007021327A1/en not_active Withdrawn
2008-04-14 WO PCT/EP2008/054464 patent/WO2008135339A1/en active Application Filing
2008-04-14 US US12/599,402 patent/US8245694B2/en not_active Expired - Fee Related
2008-04-14 EP EP20080736169 patent/EP2147207B1/en active Active
EP2147207B1 (en) 2012-07-11
WO2008135339A1 (en) 2008-11-13
US20100132667A1 (en) 2010-06-03
EP2147207A1 (en) 2010-01-27
US8245694B2 (en) 2012-08-21
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2014-07-31 R005 Application deemed withdrawn due to failure to request examination