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WO2018172266A1 - Pumping unit and method for feeding fuel, preferably diesel fuel, to an internal combustion engine - Google Patents

Pumping unit and method for feeding fuel, preferably diesel fuel, to an internal combustion engine Download PDF

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Publication number
WO2018172266A1
WO2018172266A1 PCT/EP2018/056852 EP2018056852W WO2018172266A1 WO 2018172266 A1 WO2018172266 A1 WO 2018172266A1 EP 2018056852 W EP2018056852 W EP 2018056852W WO 2018172266 A1 WO2018172266 A1 WO 2018172266A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
closing member
cylinder
feeding
combustion engine
Prior art date
Application number
PCT/EP2018/056852
Other languages
French (fr)
Inventor
Massimiliano Roncone
Andrea TORIELLO
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2018172266A1 publication Critical patent/WO2018172266A1/en

Links

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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/462—Delivery valves
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • 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
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • F02M63/0019—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means characterised by the arrangement of electromagnets or fixed armatures

Definitions

  • the present invention relates to a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine.
  • the present invention relates to a pumping unit of the type comprising a piston pump for feeding the fuel to the internal combustion engine; a pre-feed pump, for example a gear pump, for feeding the fuel from a storage tank to the piston pump; and a hydraulic circuit for connecting together the storage tank, the pre-feed pump, the piston pump and the internal combustion engine.
  • the piston pump comprises a pump body; at least one cylinder formed in the pump body; a piston slidably engaged inside the cylinder; and an actuating device for displacing the piston with an intake stroke for drawing the fuel into the cylinder and with a compression stroke for compressing the fuel contained inside the said cylinder.
  • the pumping unit comprises, moreover, an intake valve for selectively controlling feeding of the fuel into the cylinder; and a delivery valve for selectively controlling the feeding of the fuel to the internal combustion engine.
  • the delivery valve is mounted inside the delivery duct and comprises a closing member movable between a position for opening and a position for closing the delivery duct, and a spring for displacing and normally keeping the said closing member in its closed position.
  • the flowrate of the fuel fed to the internal combustion engine for each operating cycle of the piston pump is less than the nominal flowrate of the said piston pump.
  • the object of the present invention is to provide a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, which does not have the aforementioned drawbacks and is simple and inexpensive to produce.
  • a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine is provided, as claimed in claims 1 to 8.
  • the present invention relates moreover to a pumping method for feeding fuel, preferably diesel fuel, to an internal combustion engine.
  • a pumping method for feeding fuel, preferably diesel fuel, to an internal combustion engine is provided, as claimed in claims 9 to 12.
  • Figure 1 is a first cross-sectional view, with parts removed for greater clarity, of a preferred embodiment of the pumping unit according to the present invention
  • Figure 2 is a second schematic cross-sectional view, with parts removed for clarity, of the pumping unit according to Figure 1;
  • Figure 3 is a schematic perspective view of a detail of the pumping unit according to Figures 1 and 2.
  • 1 denotes in its entirety, a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine (not shown).
  • fuel preferably diesel fuel
  • the pumping unit 1 comprises a piston pump 2 for feeding the fuel to the said internal combustion engine (not shown), and a pre-feed pump 3, for example a gear pump, for feeding the fuel from a storage tank (not shown) to the said pump 2.
  • a pre-feed pump 3 for example a gear pump, for feeding the fuel from a storage tank (not shown) to the said pump 2.
  • the pump 2 has a pump body 4 comprising a support casing 5 which is provided with a central hole 6 having a longitudinal axis 7 and also has a side hole 8 which has a longitudinal axis 9 transverse to the axis 7 and extends radially towards the outside of the casing 5 from the said hole 6.
  • the hole 8 is closed by a head piece 10 which is arranged in contact with the casing 5 and has a shank 1 projecting inside the hole 8 coaxially with the axis 9.
  • the head piece 10 has a central hole 12 which is formed through the head piece 10 coaxially with the axis 9 and comprises a wide portion 13 and a narrow portion 14 aligned with each other along the said axis 9.
  • the portion 14 faces the hole 6 and defines a cylinder 15 engaged slidably by a piston 16 movable along the cylinder 15 under the thrust of an actuating device 17, with a reciprocating rectilinear movement comprising an intake stroke for drawing the fuel into the cylinder 15 and a compression stroke for compressing the fuel contained inside the said cylinder 15.
  • the device 17 comprises a tubular sleeve 18 which is engaged slidably inside the hole 8 coaxially with the axis 9, extends around the cylinder 16 and has an internal annular flange 19 which projects radially from an internal surface of the sleeve 18 and divides the said sleeve 18 into two cylindrical portions 20, 21, the portion 20 of which faces the hole 6.
  • the device 17 also has a tappet system 22 comprising an engaging block 23 with a substantially cylindrical shape which is locked by means of interference inside the portion 20, is arranged in contact with the flange 19 and supports a tappet roller 24.
  • the roller 24 projects from the block 23 towards the hole 6 and is rotatably engaged with the block 23 so as to rotate, relative to the said block 23, about its longitudinal axis 25 substantially perpendicular to the axis 9.
  • the flange 19 supports an annular disk 26 which extends around the piston 16, is inserted inside the portion 21 of the sleeve 18 coaxially with the piston 9 and has an outer perimetral edge facing axially the flange 19 and an inner perimetral edge axially facing a head of the said piston 16.
  • the device 17 also comprises a compression spring 27 which is mounted between the shank 11 and the sleeve 18 coaxially with the axis 9 and is arranged between the head piece 10 and the disk 26 so as to displace and normally keep the disk 26 in contact with the flange 19 and the roller 24 in contact with a cam 28 formed on an outer surface of an intermediate portion of a transmission shaft 29 mounted through the hole 6 so as to rotate, relative to the casing 5, about the axis 7.
  • a compression spring 27 which is mounted between the shank 11 and the sleeve 18 coaxially with the axis 9 and is arranged between the head piece 10 and the disk 26 so as to displace and normally keep the disk 26 in contact with the flange 19 and the roller 24 in contact with a cam 28 formed on an outer surface of an intermediate portion of a transmission shaft 29 mounted through the hole 6 so as to rotate, relative to the casing 5, about the axis 7.
  • the head piece 10 supports an intake valve 30 for drawing the fuel inside the cylinder 15 and a delivery valve 31 for supplying the fuel to the internal combustion engine (not shown).
  • the intake valve 30 comprises a valve body 32, which is mounted in the wide portion 13 of the hole 12, has a plurality of radial holes uniformly distributed around the axis 9 and is axially locked against a shoulder 33 defined between the portions 13 and 14 by a cover 34 screwed into the said portion 13.
  • the valve 30 also comprises a closing member 35 with an elongated shape which is mounted coaxially with the axis 9 and is slidably engaged by means of the valve body 32 so as to move parallel to the axis 9 between a position for closing and a position for opening the said valve 30.
  • the closing member 35 is displaced and normally kept in its closed position by a spring 36 arranged between the valve body 32 and a disk 37 mounted on the closing member 35 transversely with respect to the axis 9.
  • the delivery valve 31 is associated with a delivery duct 38 which has, in the case in question, a longitudinal axis 39 perpendicular to the axis 9 and comprises a narrow portion communicating with the cylinder 15 and a wide portion connected to the internal combustion engine (not shown).
  • the valve 31 comprises a closing member 40 which has a spherical shape, is made of metallic material and is housed inside the wide portion of the duct 38.
  • the closing member 40 is movable between a position for opening and a position for closing the duct 38 and is moved from its opening position into its closing position by a spring 41 arranged between the closing member 40 and an end-of-travel cylinder 42 mounted in the wide portion of the duct 38.
  • the cylinder 42 is axially locked along the duct 38 and has a central hole 43 communicating with the wide portion of the duct 38 by means of a plurality of side holes 44 uniformly distributed around the axis 39.
  • the valve 31 also comprises two electromagnets 45, 46 with an annular shape which are fitted on the head piece 10 coaxially with the axis 39, are separated from each other by a spacer 47 made of plastic and are mounted axially on opposite sides of the closing member 40.
  • the electromagnets 45, 46 and the spacer 47 are axially locked on the head piece 10 by means of lock nut 48 screwed onto the said head piece 10.
  • the electromagnet 46 is electrically energized so as to exert on the closing member 40 a force of attraction corresponding to the hydrodynamic thrust exerted on the closing member 40 by the fuel.
  • the force of attraction exerted by the electromagnet 46 on the closing member 40 is at least equal to the thrust exerted on the closing member 40 by the spring 41.
  • electromagnet 46 is de-energized and the electromagnet 45 is electrically energized so as to exert on the closing member 40 a force of attraction corresponding to the thrust of the spring 40 and opposite to the hydrodynamic thrust exerted on the closing member 40 by the fuel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Pumping unit and method for feeding fuel, preferably diesel fuel, to an internal combustion engine, wherein feeding of the fuel to the internal combustion engine is controlled selectively by means of a delivery valve (31) provided with a closing member (40) which is moved from its closed position into its open position by a first electromagnet (46) and from its open position into its closed position by a second electromagnet (45).

Description

Description
Title
PUMPING UNIT AND METHOD FOR FEEDING FU EL, PREFERABLY DI ESEL FU EL, TO AN INTERNAL COMBUSTION ENGINE
The present invention relates to a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine.
In particular, the present invention relates to a pumping unit of the type comprising a piston pump for feeding the fuel to the internal combustion engine; a pre-feed pump, for example a gear pump, for feeding the fuel from a storage tank to the piston pump; and a hydraulic circuit for connecting together the storage tank, the pre-feed pump, the piston pump and the internal combustion engine.
The piston pump comprises a pump body; at least one cylinder formed in the pump body; a piston slidably engaged inside the cylinder; and an actuating device for displacing the piston with an intake stroke for drawing the fuel into the cylinder and with a compression stroke for compressing the fuel contained inside the said cylinder.
The pumping unit comprises, moreover, an intake valve for selectively controlling feeding of the fuel into the cylinder; and a delivery valve for selectively controlling the feeding of the fuel to the internal combustion engine. The delivery valve is mounted inside the delivery duct and comprises a closing member movable between a position for opening and a position for closing the delivery duct, and a spring for displacing and normally keeping the said closing member in its closed position.
Since the piston compression stroke starts when the delivery valve is still closed, the thrust exerted by the piston on the fuel during opening of the delivery valve generates in the cylinder a relatively high pressure peak such as to damage the pump body.
Moreover, since the intake stroke of the piston starts when the delivery valve is still open and therefore results in a backflow of fuel inside the cylinder, the flowrate of the fuel fed to the internal combustion engine for each operating cycle of the piston pump is less than the nominal flowrate of the said piston pump.
From the above comments it can therefore be deduced that the known pumping units of the type described above have a number of drawbacks mainly arising from the fact that opening of the closing member of the delivery valve under the hydrodynamic thrust of the fuel and closing of the closing member of the delivery valve under the thrust of the spring do not ensure correct operation of these pumping units.
The object of the present invention is to provide a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, which does not have the aforementioned drawbacks and is simple and inexpensive to produce. According to the present invention a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine is provided, as claimed in claims 1 to 8.
The present invention relates moreover to a pumping method for feeding fuel, preferably diesel fuel, to an internal combustion engine.
According to the present invention a pumping method for feeding fuel, preferably diesel fuel, to an internal combustion engine is provided, as claimed in claims 9 to 12.
The present invention will now be described with reference to the accompanying drawings which illustrate a non-limiting example of embodiment thereof, in which:
Figure 1 is a first cross-sectional view, with parts removed for greater clarity, of a preferred embodiment of the pumping unit according to the present invention;
Figure 2 is a second schematic cross-sectional view, with parts removed for clarity, of the pumping unit according to Figure 1; and
Figure 3 is a schematic perspective view of a detail of the pumping unit according to Figures 1 and 2.
With reference to Figures 1 and 2, 1 denotes in its entirety, a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine (not shown).
The pumping unit 1 comprises a piston pump 2 for feeding the fuel to the said internal combustion engine (not shown), and a pre-feed pump 3, for example a gear pump, for feeding the fuel from a storage tank (not shown) to the said pump 2.
The pump 2 has a pump body 4 comprising a support casing 5 which is provided with a central hole 6 having a longitudinal axis 7 and also has a side hole 8 which has a longitudinal axis 9 transverse to the axis 7 and extends radially towards the outside of the casing 5 from the said hole 6.
The hole 8 is closed by a head piece 10 which is arranged in contact with the casing 5 and has a shank 1 projecting inside the hole 8 coaxially with the axis 9.
The head piece 10 has a central hole 12 which is formed through the head piece 10 coaxially with the axis 9 and comprises a wide portion 13 and a narrow portion 14 aligned with each other along the said axis 9.
The portion 14 faces the hole 6 and defines a cylinder 15 engaged slidably by a piston 16 movable along the cylinder 15 under the thrust of an actuating device 17, with a reciprocating rectilinear movement comprising an intake stroke for drawing the fuel into the cylinder 15 and a compression stroke for compressing the fuel contained inside the said cylinder 15.
The device 17 comprises a tubular sleeve 18 which is engaged slidably inside the hole 8 coaxially with the axis 9, extends around the cylinder 16 and has an internal annular flange 19 which projects radially from an internal surface of the sleeve 18 and divides the said sleeve 18 into two cylindrical portions 20, 21, the portion 20 of which faces the hole 6.
The device 17 also has a tappet system 22 comprising an engaging block 23 with a substantially cylindrical shape which is locked by means of interference inside the portion 20, is arranged in contact with the flange 19 and supports a tappet roller 24.
The roller 24 projects from the block 23 towards the hole 6 and is rotatably engaged with the block 23 so as to rotate, relative to the said block 23, about its longitudinal axis 25 substantially perpendicular to the axis 9.
The flange 19 supports an annular disk 26 which extends around the piston 16, is inserted inside the portion 21 of the sleeve 18 coaxially with the piston 9 and has an outer perimetral edge facing axially the flange 19 and an inner perimetral edge axially facing a head of the said piston 16.
The device 17 also comprises a compression spring 27 which is mounted between the shank 11 and the sleeve 18 coaxially with the axis 9 and is arranged between the head piece 10 and the disk 26 so as to displace and normally keep the disk 26 in contact with the flange 19 and the roller 24 in contact with a cam 28 formed on an outer surface of an intermediate portion of a transmission shaft 29 mounted through the hole 6 so as to rotate, relative to the casing 5, about the axis 7.
The head piece 10 supports an intake valve 30 for drawing the fuel inside the cylinder 15 and a delivery valve 31 for supplying the fuel to the internal combustion engine (not shown).
The intake valve 30 comprises a valve body 32, which is mounted in the wide portion 13 of the hole 12, has a plurality of radial holes uniformly distributed around the axis 9 and is axially locked against a shoulder 33 defined between the portions 13 and 14 by a cover 34 screwed into the said portion 13. The valve 30 also comprises a closing member 35 with an elongated shape which is mounted coaxially with the axis 9 and is slidably engaged by means of the valve body 32 so as to move parallel to the axis 9 between a position for closing and a position for opening the said valve 30.
The closing member 35 is displaced and normally kept in its closed position by a spring 36 arranged between the valve body 32 and a disk 37 mounted on the closing member 35 transversely with respect to the axis 9.
The delivery valve 31 is associated with a delivery duct 38 which has, in the case in question, a longitudinal axis 39 perpendicular to the axis 9 and comprises a narrow portion communicating with the cylinder 15 and a wide portion connected to the internal combustion engine (not shown).
The valve 31 comprises a closing member 40 which has a spherical shape, is made of metallic material and is housed inside the wide portion of the duct 38.
The closing member 40 is movable between a position for opening and a position for closing the duct 38 and is moved from its opening position into its closing position by a spring 41 arranged between the closing member 40 and an end-of-travel cylinder 42 mounted in the wide portion of the duct 38.
The cylinder 42 is axially locked along the duct 38 and has a central hole 43 communicating with the wide portion of the duct 38 by means of a plurality of side holes 44 uniformly distributed around the axis 39.
The valve 31 also comprises two electromagnets 45, 46 with an annular shape which are fitted on the head piece 10 coaxially with the axis 39, are separated from each other by a spacer 47 made of plastic and are mounted axially on opposite sides of the closing member 40.
The electromagnets 45, 46 and the spacer 47 are axially locked on the head piece 10 by means of lock nut 48 screwed onto the said head piece 10.
Operation of the delivery valve 31 will now be described from a moment when both the electromagnets 45, 46 are deactivated.
At the start of the compression stroke of the piston 16, the electromagnet 46 is electrically energized so as to exert on the closing member 40 a force of attraction corresponding to the hydrodynamic thrust exerted on the closing member 40 by the fuel.
In this way, opening of the valve 31 is accelerated and the pressure peak generated inside the cylinder 15 by the compression stroke of the piston 16 is relatively small.
The force of attraction exerted by the electromagnet 46 on the closing member 40 is at least equal to the thrust exerted on the closing member 40 by the spring 41.
Before the end of the compression stroke of the piston 16, the
electromagnet 46 is de-energized and the electromagnet 45 is electrically energized so as to exert on the closing member 40 a force of attraction corresponding to the thrust of the spring 40 and opposite to the hydrodynamic thrust exerted on the closing member 40 by the fuel.
In this way, closing of the valve 31 is accelerated and the backflow of fuel into the cylinder 15 caused by the following intake stroke of the piston 16 is relatively small.

Claims

Pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, the pumping unit comprising a piston pump (2) for feeding the fuel to the internal combustion engine; and a pre-feed pump (3) for feeding the fuel to the piston pump (2); the piston pump (2) comprising, in turn, a pump body (4); at least one cylinder (15) formed in the pump body (4); a piston (16) movable along the cylinder (15) with an intake stroke for drawing the fuel into the cylinder (15) and with a compression stroke for compressing the fuel contained inside the said cylinder (15); an intake valve (30) for selectively controlling the feeding of the fuel to the cylinder (15); a delivery duct (38) formed in the pump body (4) for connecting together the cylinder (15) and the internal combustion engine; and a delivery valve (31) for selectively controlling the feeding of the fuel to the internal combustion engine; the delivery valve (31) comprising a closing member (4) made of metallic material and movable between a position for opening and a position for closing the delivery duct (38); and being characterized in that the delivery valve (31) also comprises a first electromagnet (46) for moving the closing member (40) from its closed position into its open position and a second electromagnet (45) for moving the closing member (40) from its open position into its closed position.
2. Pumping unit according to claim 1, wherein the closing member (40) has a spherical shape.
3. Pumping unit according to claim 1 or 2, wherein the two electromagnets (45, 46) have an annular form and are mounted coaxially on a longitudinal axis (39) of the delivery duct (38).
4. Pumping unit according to claim 3, wherein the two electromagnets (45, 46) are mounted axially on opposite sides of the closing member (40).
5. Pumping unit according to claim 3 or 4, wherein the two electromagnets (45, 46) are mounted outside the pump body (4).
6. Pumping unit according to any one of the preceding claims, wherein the delivery valve (31) further comprises a spring (41) which is arranged between the closing member (40) and an end-of-travel element (42) inserted in the delivery duct (38) and designed to displace the closing member (40) from its open position into its closed position.
7. Pumping unit according to claim 6, wherein the delivery valve (31) further comprises a spacer (47) mounted between the two electromagnets (45, 46).
8. Pumping unit according to claim 7, wherein the delivery valve (31) further comprises a lock nut (48) for axially locking the two electromagnets (45, 46) and the spacer (47) on the pump body (4).
9. Pumping method for feeding fuel, preferably diesel fuel, to an internal combustion engine in a pumping unit comprising a piston pump (2) for feeding the fuel to the internal combustion engine; and a pre-feed pump (3) for feeding the fuel to the piston pump (2); the piston pump (2) comprising, in turn, a pump body (4); at least one cylinder (15) formed in the pump body (4); a piston (16) movable along the cylinder (15) with an intake stroke for drawing the fuel into the cylinder (15) and with a compression stroke for compressing the fuel contained in the said cylinder (15); an intake valve (30) for selectively controlling the feeding of the fuel to the cylinder (15); a delivery duct (38) formed in the pump body (4) for connecting together the cylinder (15) and the internal combustion engine; and a delivery valve (31) provided with a closing member (40) for selectively controlling the feeding of the fuel to the internal combustion engine; the method being characterized in that it comprises the steps of:
moving the closing member (40) from its position for closing into its position for opening the delivery valve (31) by means of a first electromagnet (46); and moving the closing member (40) from its open position into its closed position by means of a second electromagnet (45).
10. Pumping method according to claim 9 also comprising the step of:
electrically energizing the two electromagnets (45, 46) during the compression stroke of the piston.
11. Pumping method according to claim 10, wherein the first electromagnet (46) is deactivated before electrically energizing the second electromagnet (45).
12. Pumping method according to claim 10 or 11, wherein the delivery valve (31) further comprises a spring (41) for moving the closing member (40) from its open position into its closed position; the method further comprising the step of:
electrically energizing the first electromagnet (46) so as to exert on the closing member (40) an opening force at least equal to a closing force exerted on the closing member (40) by the said spring (41).
PCT/EP2018/056852 2017-03-20 2018-03-19 Pumping unit and method for feeding fuel, preferably diesel fuel, to an internal combustion engine WO2018172266A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102017000030556A IT201700030556A1 (en) 2017-03-20 2017-03-20 METHOD AND PUMPING GROUP FOR FOOD FUEL, PREFERIBLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE
IT102017000030556 2017-03-20

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Publication Number Publication Date
WO2018172266A1 true WO2018172266A1 (en) 2018-09-27

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WO (1) WO2018172266A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114514372A (en) * 2019-10-07 2022-05-17 罗伯特·博世有限公司 Pumping unit for supplying fluid, in particular fuel, preferably diesel fuel, to user equipment, in particular internal combustion engines

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000008997A (en) * 1998-06-29 2000-01-11 Hitachi Ltd Variable flow high pressure fuel pump and fuel supply control method
US20020092921A1 (en) * 2001-01-17 2002-07-18 Ulrich Augustin Hydraulically actuated injector with delay piston and method of using the same
DE102010042350A1 (en) * 2010-10-12 2012-05-03 Continental Automotive Gmbh Device for controlling pressure in fuel injection system, has inlet valve and exhaust valve for controlling actuator, and controller for controlling actuator for enabling storage fuel to return from high pressure output
DE102011089478B3 (en) * 2011-12-21 2013-06-27 Continental Automotive Gmbh injection

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000008997A (en) * 1998-06-29 2000-01-11 Hitachi Ltd Variable flow high pressure fuel pump and fuel supply control method
US20020092921A1 (en) * 2001-01-17 2002-07-18 Ulrich Augustin Hydraulically actuated injector with delay piston and method of using the same
DE102010042350A1 (en) * 2010-10-12 2012-05-03 Continental Automotive Gmbh Device for controlling pressure in fuel injection system, has inlet valve and exhaust valve for controlling actuator, and controller for controlling actuator for enabling storage fuel to return from high pressure output
DE102011089478B3 (en) * 2011-12-21 2013-06-27 Continental Automotive Gmbh injection

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114514372A (en) * 2019-10-07 2022-05-17 罗伯特·博世有限公司 Pumping unit for supplying fluid, in particular fuel, preferably diesel fuel, to user equipment, in particular internal combustion engines

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