EP0155404B1 - Dispositif de réglage pour pompes d'injection de carburant - Google Patents

Dispositif de réglage pour pompes d'injection de carburant Download PDF

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Publication number
EP0155404B1
EP0155404B1 EP84116270A EP84116270A EP0155404B1 EP 0155404 B1 EP0155404 B1 EP 0155404B1 EP 84116270 A EP84116270 A EP 84116270A EP 84116270 A EP84116270 A EP 84116270A EP 0155404 B1 EP0155404 B1 EP 0155404B1
Authority
EP
European Patent Office
Prior art keywords
control
pressure
space
relief
valve
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
Application number
EP84116270A
Other languages
German (de)
English (en)
Other versions
EP0155404A1 (fr
Inventor
Josef Hain
Karl-Friedrich Rüsseler
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
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0155404A1 publication Critical patent/EP0155404A1/fr
Application granted granted Critical
Publication of EP0155404B1 publication Critical patent/EP0155404B1/fr
Expired 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
    • 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

Definitions

  • the invention relates to a fuel injection pump for internal combustion engines according to the preamble of claim 1.
  • a pressure control valve is provided in the relief line as a directional control valve, which is designed by means of a membrane as a valve closing member and a temperature-dependent Actuating force on the membrane controls a certain pressure curve of the pressure in the control pressure chamber in the course of the heating of the internal combustion engine.
  • a pressure control valve is provided in the relief line as a directional control valve, which is designed by means of a membrane as a valve closing member and a temperature-dependent Actuating force on the membrane controls a certain pressure curve of the pressure in the control pressure chamber in the course of the heating of the internal combustion engine.
  • Such a design is very complex, and the pressure in the control pressure chamber can also only take place as a function of the change in the temperature-dependent load on the membrane. This load is based on the characteristics of a heated bimetal spring. The temperature response of such a spring is also dependent on various additional environmental influences.
  • EP-A-00 75 856 a fuel injection pump of a similar type, in which the directional control valve consists of a very complex pressure control valve which has a valve member which is more or less loaded depending on the current strengths. This configuration is also associated with considerable effort. Furthermore, it is known from this document to provide a switchable directional valve in the connection between the pressure control chamber and the relief chamber, the opening or closing of which switches the effect of a pressure-maintaining valve which is set to a specific opening pressure off or on. With such a device, only simple designs of the injection start adjustment characteristics can be generated over the speed.
  • the invention is based on the idea of generating the increase in pressure of the fuel causing the start of injection by means of the flow valve connected in series with the throttle of the control piston and of using the valve controlled by operating parameters no longer as a pressure control valve but only as a directional control valve.
  • FIG. 1 shows a block diagram of the elements of a fuel injection pump for internal combustion engines that effect the start of injection
  • FIG. 2 shows a speed-displacement diagram with the start of injection characteristic curve with normal function of the internal combustion engine and with early adjustment.
  • an adjusting piston 13 engages via a pin 12 for the adjustment of the start of injection.
  • the piston 13 is displaceable in a working space 14 against the force of a return spring 15 by means of a pressure fluid; a shift in the direction of the return spring 15 brings about an early adjustment of the start of injection of the internal combustion engine which is proportional to the piston travel.
  • a feed pump 16 sucks fuel via a line 8 from a container 17 into an interior 10 of the injection pump.
  • the interior 10 and the work space 14 are connected by a line 19 equipped with a throttle 18.
  • a pressure control valve 20 has a displaceable in a cylinder 23 control piston 24, one end face 22 controls a drain opening 21 of the cylinder 23 and forms a pressure chamber 27 with the cylinder 23, which has a pressure line 26 connection to the interior 10 of the injection pump 11.
  • Die Drain opening 21 is connected via a relief line 33 to a relief space formed by the container 17 or the suction side of the feed pump 16.
  • the rear 28 of the control piston 24 forms a control pressure chamber 29 with the cylinder 23, and a control spring 32 is clamped between the rear 28 and the bottom of the cylinder 23, so that, according to the principle of a spring-loaded slide valve, the pressure in the interior 10 as a function of the conveyed Amount of fuel can be changed automatically.
  • the control piston 24 has a control ring groove 34 which has a permanent connection to the control pressure chamber 29 via a plurality of radial branch channels 35 leading into a center bore 30.
  • the center bore 30 and the pressure chamber 27 connect a throttle bore 31.
  • a 2/2-way valve 38 is e.g. B. formed as a pull solenoid valve with an excitation coil 39 and an armature formed as a valve closing member 40, which a closing spring 41 presses when the excitation coil 39 is de-energized against a stationary valve seat 42; this is connected to the control pressure chamber 29 of the pressure control valve 20 by a relief line 43.
  • a relief line 43 ′ leads from the interior 44 to the relief space in the manner described above.
  • a control device 45 controls depending on operating parameters, such as temperature, pressure, start of speed injection, via lines 46, the excitation coil 39 such that this in Tension state holds the valve closing member 40 in its open position shown and the control pressure chamber 29 is relieved.
  • a bypass line 47 is arranged parallel to the directional control valve 38 between the two relief lines 43 and 43 '.
  • the bypass line 47 has an adjustable throttle valve 48 or adjustable orifice valve as a flow valve.
  • the pressure of the fuel enclosed in the interior 10 of the injection pump 11 is controlled as follows on the basis of the travel speed (pressure) diagram:
  • the speed-dependent pressure of the fuel in the interior 10 acts on the adjusting piston 13 in accordance with the characteristic curve 50 in FIG. 2.
  • the operating device for example temperature or speed of the internal combustion engine
  • atmospheric pressure de-excites the excitation coil 39 via the control device 45 of the directional control valve 38
  • the armature 40 closes the valve seat 42, so that the relief of the control pressure chamber 29 takes place only via the throttle valve 48 of the bypass line 47. This increases the pressure in the interior 10 and there is an early adjustment of the injection timing according to the partial characteristic curve 51.
  • the partial line 53 which is adjusted to the characteristic curve of the internal combustion engine, begins; the slope of which is determined by the flow cross-section of the second discharge opening 36 of the pressure control valve 20, which is controlled by the control piston 24.
  • the partial characteristic curve 55 starting from point 54 runs approximately parallel to the characteristic curve 50.
  • the adjusting piston 13 moves from point 56 according to the partial characteristic curve 58 to point 57 on the characteristic curve 50, on which the further adjustment takes place.

Landscapes

  • 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 (1)

  1. Pompe d'injection de carburant pour moteurs à combustion interne, comprenant une pompe de refoulement de carburant (16) entraînée de manière synchrone par rapport à la pompe d'injection et dont le côté refoulement est relié à une enceinte de travail (14) située devant un piston de réglage (13) servant au réglage du début d'injection et soumis à l'action d'une force de rappel (15) et reliée, par une ouverture d'écoulement (21) commandée par un piston de commande (24) d'une soupape de commande de pression (20), à une enceinte de décharge (8, 17) pour produire une pression de commande dépendant de la vitesse de rotation et la pression agissant sur le côté avant du piston de commande (24), le piston de commande (24) étant soumis à la force d'un ressort de pression (32) agissant sur le côté arrière (28), et une enceinte de pression de commande (29), se trouvant sur le côté arrière du piston de commande, étant reliée par une conduite d'étranglement (31), au côté refoulement de la pompe de refoulement (16) et par une conduite de décharge (43), à l'enceinte de décharge, et avec une soupape (38) qui est disposé dans la conduite de décharge (43) et commandable en fonction de paramètres de fonctionnement, et avec un deuxième orifice d'écoulement (36), qui est relié à l'enceinte de décharge (8, 17) et est reliable à l'enceinte de commande de pression (29) par une arête de commande (34) située dans l'enveloppe du piston de commande (24), caractérisé en ce qu'une conduite de dérivation (47) qui est parallèle à la soupape (38) comporte une dérivation à l'extérieur de la zone de réglage du piston de commande de l'enceinte de pression de commande (29) de la soupape de commande de pression (20) et relie celle-ci à l'enceinte de décharge (8, 17) et contient un étranglement réglable.
EP84116270A 1984-03-20 1984-12-22 Dispositif de réglage pour pompes d'injection de carburant Expired EP0155404B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843410146 DE3410146A1 (de) 1984-03-20 1984-03-20 Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3410146 1984-03-20

Publications (2)

Publication Number Publication Date
EP0155404A1 EP0155404A1 (fr) 1985-09-25
EP0155404B1 true EP0155404B1 (fr) 1988-09-14

Family

ID=6231035

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84116270A Expired EP0155404B1 (fr) 1984-03-20 1984-12-22 Dispositif de réglage pour pompes d'injection de carburant

Country Status (4)

Country Link
US (1) US4619238A (fr)
EP (1) EP0155404B1 (fr)
JP (1) JPS60212633A (fr)
DE (2) DE3410146A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3517974A1 (de) * 1985-05-18 1986-11-20 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3619325A1 (de) * 1986-06-09 1987-12-10 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3813880A1 (de) * 1988-04-25 1989-11-02 Bosch Gmbh Robert Kraftstoffeinspritzpumpe
DE3822257A1 (de) * 1988-07-01 1990-01-04 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3827206A1 (de) * 1988-08-11 1990-02-15 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3912624A1 (de) * 1989-04-18 1990-10-25 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
US5180290A (en) * 1989-06-02 1993-01-19 Lucas Industries Fuel injection pumping apparatus
US5197441A (en) * 1989-06-03 1993-03-30 Lucas Industries Fuel injection pumping apparatus
DE3943246A1 (de) * 1989-12-29 1991-07-04 Bosch Gmbh Robert Kraftstoffeinspritzpumpe
DE4117813A1 (de) * 1991-05-31 1992-12-03 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
GB9826348D0 (en) * 1998-12-02 1999-01-27 Lucas Ind Plc Advance arrangement
DE102010031570B4 (de) 2010-07-20 2021-11-25 Robert Bosch Gmbh Verfahren zum Bestimmen einer Charakteristik für ein Druckregelventil

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2644699A1 (de) * 1976-10-02 1978-04-06 Bosch Gmbh Robert Kraftstoffeinspritzanlage
DE2648043C2 (de) * 1976-10-23 1984-05-24 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe für Brennkraftmaschinen
DE2925418A1 (de) * 1979-06-23 1981-01-29 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE2931944A1 (de) * 1979-08-07 1981-03-26 Robert Bosch Gmbh, 70469 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE2931987A1 (de) * 1979-08-07 1981-02-26 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
JPS57157026A (en) * 1981-03-25 1982-09-28 Diesel Kiki Co Ltd Injectiontiming adjusting unit of distribution type fuel injection pump
JPS57157025A (en) * 1981-03-25 1982-09-28 Diesel Kiki Co Ltd Injectiontiming adjusting unit of distribution type fuel injection pump
DE3138607A1 (de) * 1981-09-29 1983-04-14 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3138606A1 (de) * 1981-09-29 1983-04-14 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3148214A1 (de) * 1981-12-05 1983-06-09 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3148215A1 (de) * 1981-12-05 1983-06-09 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
JPS58101230A (ja) * 1981-12-14 1983-06-16 Toyota Motor Corp デイ−ゼル機関の燃料噴射ポンプ制御装置

Also Published As

Publication number Publication date
DE3410146A1 (de) 1985-10-03
DE3474053D1 (en) 1988-10-20
EP0155404A1 (fr) 1985-09-25
US4619238A (en) 1986-10-28
JPS60212633A (ja) 1985-10-24

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