EP0915251A2 - Système d'injection d'accumulateur pour un moteur à plusieurs cylindres - Google Patents

Système d'injection d'accumulateur pour un moteur à plusieurs cylindres Download PDF

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Publication number
EP0915251A2
EP0915251A2 EP19980117891 EP98117891A EP0915251A2 EP 0915251 A2 EP0915251 A2 EP 0915251A2 EP 19980117891 EP19980117891 EP 19980117891 EP 98117891 A EP98117891 A EP 98117891A EP 0915251 A2 EP0915251 A2 EP 0915251A2
Authority
EP
European Patent Office
Prior art keywords
throttle
control piston
solenoid valve
spacer plate
nozzle needle
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.)
Withdrawn
Application number
EP19980117891
Other languages
German (de)
English (en)
Inventor
Ulrich Dr. Augustin
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.)
Daimler AG
Original Assignee
DaimlerChrysler AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP0915251A2 publication Critical patent/EP0915251A2/fr
Withdrawn legal-status Critical Current

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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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
    • F02M63/0005—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using valves actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure

Definitions

  • the invention relates to a storage injection system for a multi-cylinder internal combustion engine with solenoid-controlled direct-injection fuel injection valves, with a supply line provided in each valve housing, which leads on the one hand to a spring-loaded nozzle needle and, on the other hand, is connected to a control chamber via a line arrangement acting as an inlet throttle, which is connected from one on the rear of the Nozzle needle lying and the line arrangement control piston is limited, possibly with a cooperating with the control piston and controlling the supply line leading to the nozzle needle valve body, further with a pressure relief in the control chamber controlling solenoid valve, by means of which a relief connection can be established via a discharge throttle to a relief line.
  • a memory injection system for fuel injection valves with solenoid valve control of this type is known from DE 196 12 738 A1.
  • the supply line is permanently connected to the control chamber via a line arrangement integrated in the control piston and provided with a throttle point, which can be connected to the low-pressure system for pressure relief by activating the solenoid valve via the discharge throttle.
  • a throttle point which can be connected to the low-pressure system for pressure relief by activating the solenoid valve via the discharge throttle.
  • an amount of undesirable leakage occurs in the relief line on the low-pressure side in the course of the pressure relief and thus during the injection.
  • the invention is therefore based on the object of providing measures on the generic accumulator injection system by means of which hydraulic leakage losses can be reduced in a simple manner.
  • the small throttle does not influence normal operating behavior or tolerance sensitivity, it therefore only limits the control quantity or leakage quantity during the injection to a value that is insignificant for the injection.
  • the system according to the invention contributes to a considerable improvement in efficiency.
  • the use of the spacer plate gives a further advantage in that it can be used to adjust the valve stroke. This makes it possible to compensate for manufacturing tolerances of the valve housing and the control piston or, if appropriate, further intermediate elements after the measurement.
  • the rail system memory injection system essentially consists of a spring-loaded nozzle needle 2 with a pressure chamber 3 surrounding it and a control piston 4 arranged on the back of this nozzle needle 2 with a line arrangement 6 having an inlet throttle 5 and a solenoid valve 7 located at the upper end of the fuel injection valve 1.
  • Nozzle needle 2 and control piston 4 are connected to one another via a push rod 8.
  • the line arrangement 6 is composed of a transverse bore 9, a central bore 10 containing the inlet bore 5 and a circumferential groove 11.
  • a supply line 13 running in the valve housing 12 leads on the one hand into the pressure chamber 3 and on the other hand with its branching line section 13a to the circumferential groove 11 on the control piston 4.
  • the control piston 4 delimits a control chamber 14 which, with the supply line 13 via the line section 13a, the circumferential groove 11, the transverse bore 9 and the central bore 10 are always fluidly connected to one another, regardless of the respective position of the control piston 4.
  • a spacer plate 15 is guided with a centrally running bore acting as a small throttle 16, which is coaxial with the central bore 10 with inlet throttle 5.
  • the inlet throttle 5 like an outlet throttle 18 arranged in the valve housing 12, is substantially larger in diameter, the inlet and outlet throttle 5.18 being approximately the same in diameter.
  • the spacer plate 15 is provided on its end face 7a facing the solenoid valve 7 with a diametrically extending through channel 19, into which the central bore with its small throttle 16 opens.
  • the outlet throttle 18 can be controlled by the solenoid valve 7, which operates as a function of the operating parameters.
  • Injection is initiated by opening the solenoid valve 7 (FIG. 3).
  • the control piston 4 reaches its upper stop due to the pressure relief in the control chamber 14 by pressing the spacer plate 15 against the upper wall 14a of the control chamber 14.
  • the spacer plate 15 closes the inlet throttle 5 and limits the inlet via the small throttle 16.
  • the through channel 19 in the upper end face 7a of the spacer plate 15 prevents the outlet throttle 18 from being closed.
  • the pressure in the control chamber 14 then drops further due to the reduced inlet.
  • the amount of control leakage in this state is determined only by the size of the small throttle 16 and can be made almost arbitrarily small.
  • the discharge throttle 18 connected to a relief line (not shown in more detail) is closed.
  • the throttle 16 in the spacer plate 15 then only has to build up the pressure in the small control chamber volume in order to separate the control piston 4 and the spacer plate 15 from one another.
  • the needle needle 2 is closed in the usual way by filling the control chamber 14 through the inlet throttle 5, as a result of which the nozzle needle 2 is pressed onto its needle seat via the control piston 4 and the push rod 8.
  • FIG. 1 A simplified embodiment of the fuel injection valve is shown in FIG. 1, while a servo valve piston 20 which interacts with the control piston 4 is additionally arranged in FIGS. 2 and 3, via which the feed line leading to the nozzle needle 2 is arranged 13 is controllable.
  • the spacer plate 15 can also be used in this embodiment.
  • a flow connection from the supply line 13 to the control chamber 14 is provided here through holes 21 and 22 in the servo valve piston 20 and control piston 4.
  • valve ball 23 of solenoid valve 7 and servo valve piston 20 are in the closed position, and inlet throttle 5 of control piston 4 is completely open, that is, it is not closed by spacer plate 15.
  • This state changes when the solenoid valve 7 opens and the control piston 4 bears against the spacer plate 15, which closes the inlet throttle 5, so that only an insignificant amount of leakage or control quantity can flow off via the small throttle 16 in the spacer plate 15 on the low pressure side.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP19980117891 1997-11-06 1998-09-22 Système d'injection d'accumulateur pour un moteur à plusieurs cylindres Withdrawn EP0915251A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19749001 1997-11-06
DE1997149001 DE19749001A1 (de) 1997-11-06 1997-11-06 Speichereinspritzsystem für eine mehrzylindrige Brennkraftmaschine

Publications (1)

Publication Number Publication Date
EP0915251A2 true EP0915251A2 (fr) 1999-05-12

Family

ID=7847772

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980117891 Withdrawn EP0915251A2 (fr) 1997-11-06 1998-09-22 Système d'injection d'accumulateur pour un moteur à plusieurs cylindres

Country Status (2)

Country Link
EP (1) EP0915251A2 (fr)
DE (1) DE19749001A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001029410A1 (fr) * 1999-10-21 2001-04-26 Robert Bosch Gmbh Injecteur de carburant haute pression dote d'un tiroir de distribution a commande hydraulique
EP1302654A2 (fr) * 2001-10-12 2003-04-16 C.R.F. Società Consortile per Azioni Injecteur de carburant de moteur à combustion interne
EP1111229A3 (fr) * 1999-12-16 2003-05-28 Wärtsilä NSD Oy Ab Injecteur de carburant pour moteur alternatif à combustion interne
WO2006095143A1 (fr) * 2005-03-09 2006-09-14 Delphi Technologies, Inc. Agencement de soupape

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19612738A1 (de) 1995-04-05 1996-10-10 Avl Verbrennungskraft Messtech Speichereinspritzsystem für Brennkraftmaschinen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5671715A (en) * 1995-04-27 1997-09-30 Nipon Soken, Inc. Fuel injection device
EP0745764B1 (fr) * 1995-06-02 2001-03-21 Ganser-Hydromag Ag Soupape d'injection de combustible pour moteurs à combustion interne

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19612738A1 (de) 1995-04-05 1996-10-10 Avl Verbrennungskraft Messtech Speichereinspritzsystem für Brennkraftmaschinen

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001029410A1 (fr) * 1999-10-21 2001-04-26 Robert Bosch Gmbh Injecteur de carburant haute pression dote d'un tiroir de distribution a commande hydraulique
KR100703921B1 (ko) * 1999-10-21 2007-04-05 로베르트 보쉬 게엠베하 고압 저장기를 갖는 내연기관용 연료분사기 및 내연기관
EP1111229A3 (fr) * 1999-12-16 2003-05-28 Wärtsilä NSD Oy Ab Injecteur de carburant pour moteur alternatif à combustion interne
EP1302654A2 (fr) * 2001-10-12 2003-04-16 C.R.F. Società Consortile per Azioni Injecteur de carburant de moteur à combustion interne
EP1302654A3 (fr) * 2001-10-12 2003-11-05 C.R.F. Società Consortile per Azioni Injecteur de carburant de moteur à combustion interne
US6793158B2 (en) 2001-10-12 2004-09-21 C.R.F. Societa Consortile Per Azioni Internal combustion engine fuel injector
US7055766B2 (en) 2001-10-12 2006-06-06 Fiat Ricerche Internal combustion engine fuel injector
WO2006095143A1 (fr) * 2005-03-09 2006-09-14 Delphi Technologies, Inc. Agencement de soupape
EP1707801A1 (fr) * 2005-03-09 2006-10-04 Delphi Technologies, Inc. Arrangement de soupapes

Also Published As

Publication number Publication date
DE19749001A1 (de) 1999-05-27

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