EP1312782B1 - Pompe à injection à accélération de démarrage à froid pour moteurs à combustion interne à injection directe - Google Patents

Pompe à injection à accélération de démarrage à froid pour moteurs à combustion interne à injection directe Download PDF

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Publication number
EP1312782B1
EP1312782B1 EP02022593A EP02022593A EP1312782B1 EP 1312782 B1 EP1312782 B1 EP 1312782B1 EP 02022593 A EP02022593 A EP 02022593A EP 02022593 A EP02022593 A EP 02022593A EP 1312782 B1 EP1312782 B1 EP 1312782B1
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EP
European Patent Office
Prior art keywords
piston
injection
cold
fuel feed
feed assembly
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.)
Expired - Lifetime
Application number
EP02022593A
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German (de)
English (en)
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EP1312782A3 (fr
EP1312782A2 (fr
Inventor
Helmut Simon
Helmut Haberer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP1312782A2 publication Critical patent/EP1312782A2/fr
Publication of EP1312782A3 publication Critical patent/EP1312782A3/fr
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Publication of EP1312782B1 publication Critical patent/EP1312782B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
    • F02D1/16—Adjustment of injection timing
    • F02D1/18—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse
    • F02D1/183—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
    • F02D1/16—Adjustment of injection timing
    • F02D1/18—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse
    • F02D1/183—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic
    • F02D2001/186—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic using a pressure-actuated piston for adjustment of a stationary cam or roller support

Definitions

  • the start of injection must be adapted to the respective operating phase of the internal combustion engine, especially in self-igniting internal combustion engines.
  • the cold start phase in particular at low ambient temperatures, it is necessary to postpone the start of injection on diesel distributor injection pumps early, thereby enabling a emission and noise emission start with regard to the particle emission.
  • diesel fuel takes a certain period of time to form a flammable, self-igniting mixture at high pressure with the combustion air.
  • the time required between the beginning of the injection and the start of combustion is referred to as ignition delay in self-igniting internal combustion engines. This is among other factors also determined by the ignitability of the diesel fuel (expressed by the cetane number), the achievable compression ratio of the autoignition internal combustion engine and the quality of the fuel atomization through the injector of the fuel injector.
  • the ignition delay in self-igniting internal combustion engines is usually in the order of 1 - 2 ms. During the cold start phase, especially at low outside temperatures, this period of time is prolonged, resulting in soot formation by unburned fuel entering the environment through the exhaust system.
  • a hydraulic measure for cold-start acceleration is a temporary increase in the interior pressure of the distributor injection pump during the cold start and the internal combustion engines that ignite directly after this subsequent cold-running phase. By raising the internal pressure, the displacement of a Spritzverstellerkolbens is effected, resulting in a shift of the injection start to early.
  • the disadvantage of this measure is a late release of the injection plunger by slowly taking place pressure build-up in the interior of the distributor injection pump.
  • Another way to adjust the start of injection to early is to adjust by adjusting a designed as a roller ring component during the start and the cold running phase of the self-igniting internal combustion engine, the injection timing piston and thus injection start to early.
  • Another measure which can be carried out mechanically is to press on one side of the injection adjusting piston by means of an eccentric shaft and thereby to adjust the injection adjusting piston in such a way that the start of injection shifts to early.
  • the mentioned measure has the disadvantage that only slight adjustment possibilities can be achieved, which find their limit in the mechanical overstress of the components involved and thus only a limited shift of the start of injection can be achieved early on (see, for example US-A-4408495 ).
  • the displacement of the injection piston in the direction of an earlier start of injection takes place in the cold phase by opening the inlet bore by a follower piston.
  • the follower piston may also be designed as a servo piston or as a control slide. The function of this device is to open and close the inlet and outlet on the injection adjusting piston.
  • the injection piston of the distributor injection pump is moved in the direction of "injection early" by a follower piston, which releases or closes an inlet bore.
  • the follower piston which is moved by a spring-sleeve combination, is supported on a cold start acceleration piston whose end face projects into a pressure space.
  • the follower piston which may be designed in various embodiments both as a control slide, as a servo or as a control piston, opens and closes the inlet and outlet of the Spritzverstellerkolbens, so that this according to the operating state of the self-igniting internal combustion engine shifts the injection timing accordingly.
  • this pressure chamber In the cold state of the distributor injection pump and the internal combustion engine, this pressure chamber is depressurized, so that the end face of the cold start acceleration piston dips into this.
  • the side facing away from the end face of the cold start acceleration piston acts as a displaceable support surface for the spring-sleeve combination of the follower piston.
  • the cold start acceleration piston in turn is adjusted by the pressure in the pressure chamber of the cold start acceleration unit.
  • the pressure chamber is empty and is filled only at the beginning of the warm-up phase of the internal combustion engine.
  • the pressure in the pressure chamber increases, the cold-start acceleration piston shifts so that the follower piston / control slide assumes its normal position and the start of injection is again withdrawn from early.
  • the cold start acceleration piston of the distributor injection pump can also be used to operate external controls, such as a load-dependent one Start of delivery shift (LFB function).
  • LLB function load-dependent one Start of delivery shift
  • This function is switched by, for example, an annular groove.
  • this external control is switched off, ie the example formed as a groove opening or a corresponding hole remains closed.
  • the load-dependent start of delivery function can be switched on, since the internal pressure in the interior of the distributor injection pump increases. The control of the load-dependent delivery start shift occurs when the opening is open.
  • Fig. 1 shows the side view of the injection manifold pump with flanged adjustment for the Einspritzverstellerkolben.
  • FIG. 1 The representation according to Fig. 1 can be seen an injection distributor pump whose housing 1 is shown in side view. To the housing 1 of the injection distributor pump an adjusting unit 2 is flanged to shift the start of injection. This is fastened with flange screws 7 and 8 laterally on the housing 1 of the injection distributor pump.
  • the adjusting unit 2 for shifting the start of injection is associated with a controller in the form of an electromagnet 3.
  • connection line 9 for controlling the load-dependent princess function provided which is secured with a hollow screw 10 on top of the housing 1 of the injection manifold pump.
  • Fig. 2 shows the location of a control groove for driving an LFB function of the injection manifold pump.
  • Fig. 2 From the sectional view according to Fig. 2 shows that in the adjusting unit for shifting the start of injection 2 movably recorded cold start acceleration piston 12 is received by means of a spring element 14 associated therewith in the adjustment unit 2.
  • a pressure chamber 11 In the adjustment unit 2, ie between a wall thereof and an end face 13 of the cold start acceleration piston 12, a pressure chamber 11 is formed.
  • an annular groove 16.1 On the outside of the lateral surface of the cold-start acceleration piston 12, an annular groove 16.1 is accommodated, which cooperates with an opening 16.2 so formed in the housing of the adjustment unit for shifting the start of injection and forms a drainage bore 16 with the latter.
  • the drain hole 16, ie, the interaction of the annular groove 16.1 of the cold-start acceleration piston 12 with the housing bore 16.2, allows the provision of an LFB function without external wiring on the adjustment unit 2 for shifting the injection start.
  • the LFB function can be switched off, depending on the operating state of the self-igniting internal combustion engine, ie in the cold state and switched on in the heated state, without a externally operated external wiring would be required.
  • the cold spring acceleration piston 12 acting on the piston spring 14 is supported on the one hand on a support surface in the piston interior and on the other hand on a support plate 15, which may be secured by means of fastening screws on the housing 1 of the injection manifold pump.
  • Fig. 3 shows a longitudinal section through the cold start acceleration piston within the adjustment unit for shifting the onset of entry below an electromagnet.
  • Fig. 3 can be removed that the housing 1 of the injection distributor pump and the housing of the adjusting unit 2 are summarized to shift the start of injection into a single unit.
  • the sealing of the housing 1 or 2 is achieved via a sealing plate 25.
  • a positioner in the form of an electromagnet 3 is arranged in the upper region of the housing of the adjusting unit 2 for shifting the start of injection. This allows a pressure relief of the pressure chamber 11 of the adjusting unit 2 for shifting the start of injection via a relief bore 31 shown here in dashed lines.
  • an injection adjusting piston 17 is movably mounted in the adjusting unit 2 for shifting the start of injection.
  • the injection adjusting piston 17 comprises, for example, two inlet bores oriented at an angle to each other.
  • a rotatably mounted insert is formed in the Einspritzverstellerkolben 17, with which at a displacement movement of the Einspritzverstellerkolbens 17 mounted in the housing 1 of the injection distributor pump ring is adjustable with respect to the injection start between early and late depending on the operating state of the self-igniting internal combustion engine.
  • a cold start acceleration piston 12 is slidably mounted in the housing of the adjusting unit 2 for shifting the injection start.
  • the pressure chamber which is bounded on the one hand by the inside of the cold start acceleration piston 12 and on the other side by the end face of the injection adjuster piston 17, is depressurized. From this pressure space branches a e.g. as a groove provided opening 16 which in the closed state, an external drive, such as. switches off the LFB function, but switches on the LFB function when the distributor injection pump is warmed up; If the LFB function is switched on, the e. g. open as a groove opening 16 open.
  • the cold-start acceleration piston 12 comprises stop surfaces 13.1, 13.2 and 13.3 arranged in a stepped manner on its side facing away from its end face 13. Each of these abutment surfaces 13.1, 13.2 and 13.3 acts as a support surface for preferably designed as coil springs spring elements.
  • a spring element 14 acting only on the cold-start acceleration piston 12 of a spring force is supported on the first stop surface 13.1 on the inside of the cold-start acceleration piston 11 and on a support ring 15 mounted on the housings 1 and 2.
  • the support ring 15 is in the housings via fastening elements - preferably insertion screws - which are identified by reference numeral 23 bolted and fixed stationary.
  • a spring / sleeve combination 19 is supported.
  • the spring / sleeve combination comprises a sleeve 19.1 and a spring element 19.2 received thereon.
  • the spring element 19.2 is supported, on the one hand, on a first stop ring 19.3 of the spring / sleeve combination 19 and, on the other hand, on a slotted disk 20 opposite the first stop ring 19.3.
  • the slotted disc 20 in turn abuts against the bottom surface of a recess on an end face of the injection adjusting piston 17.
  • the first stop ring 19.3 of the sleeve 19.1 of the spring / sleeve combination 19 bears against the second stop face 13.2 of the cold-start acceleration piston 12 and is acted on by the spring element 19.2.
  • the second stop ring 19.4 of the sleeve 19.1 surrounds a support plate 27 of a follower piston / control slide 24th
  • follower piston / control slide 24 is acted upon by a follower piston spring 21 with a spring force, wherein the follower piston spring 21 is supported on a bearing on the third contact surface 13.1 of the cold start acceleration piston 12 ring 22.
  • the follower piston / control slide 24 in turn is traversed by a channel system which comprises a transverse bore 26 and a standing with this longitudinal bore 28 with diameter graduation.
  • the injection distributor pump is adjusted so that there is an early start of the injection of fuel into the individual combustion chambers self-igniting internal combustion engine comes.
  • the particle emission or the noise development at the start of a self-igniting internal combustion engine and in the subsequent cold running phase can be significantly reduced.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)

Claims (11)

  1. Groupe d'alimentation en carburant de moteurs à combustion interne comportant un boîtier (1) ayant une unité de réglage (2) pour déplacer le point d'injection du carburant dans les chambres de combustion du moteur à combustion interne, et logeant un piston de réglage d'injection (17) monté de manière coulissante dans l'unité de réglage (2) et entourant un tiroir de réglage/piston de poursuite (24) mobile de manière relative par rapport à celui-ci,
    caractérisé en ce que
    Pour déplacer le début de l'injection, l'unité de réglage (2) comporte une chambre de pression (11) sollicitée en pression/déchargée en pression par l'intermédiaire d'un actionneur (3), chambre de pression par laquelle un piston d'accélération de démarrage à froid (12) peut être déplacé, ce piston sollicitant d'un côté le tiroir de réglage/piston de poursuite (24) par un élément de ressort (21) et de l'autre côté, il agit par une combinaison ressort/manchon (19 ; 19.1 ; 19.2) sur le piston de réglage d'injection (17).
  2. Groupe d'alimentation en carburant selon la revendication 1,
    caractérisé en ce que
    le piston d'accélération de démarrage à froid (12) comporte des surfaces d'appui (13.1, 13.2, 13.3) réalisées de manière étagée sur le côté tourné vers le piston de réglage d'injection (17).
  3. Groupe d'alimentation en carburant selon la revendication 1,
    caractérisé en ce que
    le piston d'accélération du démarrage à froid (12) comporte dans sa surface enveloppe une ouverture (16.1) qui forme avec une ouverture (16.2) côté boîtier, une sortie (16) pour commander des fonctions externes.
  4. Groupe d'alimentation en carburant selon la revendication 2,
    caractérisé par
    un élément de ressort (14) appliqué contre une première surface d'appui (13.1) du piston d'accélération de démarrage à froid (12), cet élément de ressort (14) s'appuyant contre une surface d'appui (15) de l'unité de réglage (2) pour déplacer le début de l'injection.
  5. Groupe d'alimentation en carburant selon la revendication 2,
    caractérisé par
    une combinaison ressort/manchon (19) logée entre une seconde surface de butée (13.2) du piston d'accélération de démarrage à froid (12) et une face frontale du piston de réglage d'injection (17).
  6. Groupe d'alimentation en carburant selon la revendication 5,
    caractérisé en ce que
    la combinaison ressort/manchon (19) comprend un manchon (19.1) dont la première bague de butée (19.3) est appliquée contre la seconde surface d'appui (13.2) du piston d'accélération de démarrage à froid (12) et dont la seconde bague de butée (19.4) entoure un disque d'appui (27) du tiroir de réglage/piston de poursuite (24).
  7. Groupe d'alimentation en carburant selon la revendication 5 ou 6,
    caractérisé en ce que
    la combinaison ressort/manchon (19) comporte un élément de ressort (19.2) qui précontraint la première bague de butée (19.3) du manchon (19.1) et le piston de réglage d'injection (17) l'un par rapport à l'autre.
  8. Groupe d'alimentation en carburant selon la revendication,
    caractérisé par
    un élément de ressort (21) installé entre la troisième surface d'appui (13.3) du piston d'accélération de démarrage à froid (12) et le tiroir de réglage/piston d'asservissement (14), cet élément de ressort (21) sollicitant ce tiroir de réglage.
  9. Groupe d'alimentation en carburant selon la revendication 6,
    caractérisé en ce que
    le manchon (19.1) de la combinaison ressort/manchon (19) comporte des orifices (19.5) par lesquels du fluide sortant des canaux (26, 28) passe dans la cavité.
  10. Groupe d'alimentation en carburant selon la revendication 1,
    caractérisé en ce que
    le coulissement du tiroir de réglage/piston de poursuite (24) dans la cavité se fait indépendamment du mouvement d'entrée du piston de réglage d'injection (17).
  11. Groupe d'alimentation en carburant selon la revendication 1,
    caractérisé en ce que
    la mise en pression/décharge en pression de la chambre de pression (11) de l'unité de réglage (2) se fait pour déplacer le début de l'injection par un électroaimant (3).
EP02022593A 2001-11-16 2002-10-09 Pompe à injection à accélération de démarrage à froid pour moteurs à combustion interne à injection directe Expired - Lifetime EP1312782B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10156338A DE10156338B4 (de) 2001-11-16 2001-11-16 Einspritzpumpe mit Kaltstartbeschleunigung für direkteinspritzende Verbrennungskraftmaschinen
DE10156338 2001-11-16

Publications (3)

Publication Number Publication Date
EP1312782A2 EP1312782A2 (fr) 2003-05-21
EP1312782A3 EP1312782A3 (fr) 2005-05-18
EP1312782B1 true EP1312782B1 (fr) 2008-08-06

Family

ID=7705997

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02022593A Expired - Lifetime EP1312782B1 (fr) 2001-11-16 2002-10-09 Pompe à injection à accélération de démarrage à froid pour moteurs à combustion interne à injection directe

Country Status (3)

Country Link
US (1) US6792922B2 (fr)
EP (1) EP1312782B1 (fr)
DE (2) DE10156338B4 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7350508B1 (en) * 2006-10-12 2008-04-01 Delphi Technologies, Inc. Advance arrangements

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4408591A (en) * 1980-11-15 1983-10-11 Diesel Kiki Co., Ltd. Injection timing control device for distributor-type fuel injection pumps

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3897764A (en) * 1973-05-18 1975-08-05 Cav Ltd Liquid fuel injection pumping apparatus
US4037574A (en) * 1976-05-21 1977-07-26 Stanadyne, Inc. Timing control for fuel injection pump
DE2716307A1 (de) * 1977-04-13 1978-10-19 Volkswagenwerk Ag Kraftstoff-einspritzpumpe fuer eine selbstzuendende brennkraftmaschine
JPS60259732A (ja) * 1984-05-09 1985-12-21 Diesel Kiki Co Ltd 分配型燃料噴射ポンプの噴射時期調整装置
JPS6141840U (ja) * 1984-06-12 1986-03-17 株式会社ボッシュオートモーティブ システム 分配型燃料噴射ポンプの噴射時期調整装置
GB8621668D0 (en) * 1986-09-09 1986-10-15 Lucas Ind Plc Fuel injection pump
GB9226669D0 (en) * 1992-12-22 1993-02-17 Lucas Ind Plc Fuel pump
JP3560711B2 (ja) * 1995-04-07 2004-09-02 株式会社日本自動車部品総合研究所 燃料噴射ポンプの噴射時期制御装置
DE19849925A1 (de) * 1998-10-29 2000-05-04 Bosch Gmbh Robert Kraftstoffeinspritzpumpe

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4408591A (en) * 1980-11-15 1983-10-11 Diesel Kiki Co., Ltd. Injection timing control device for distributor-type fuel injection pumps

Also Published As

Publication number Publication date
EP1312782A3 (fr) 2005-05-18
US6792922B2 (en) 2004-09-21
US20030116139A1 (en) 2003-06-26
DE50212595D1 (de) 2008-09-18
DE10156338A1 (de) 2003-06-05
EP1312782A2 (fr) 2003-05-21
DE10156338B4 (de) 2005-05-04

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