EP3025049A1 - Fuel injector - Google Patents
Fuel injectorInfo
- Publication number
- EP3025049A1 EP3025049A1 EP14748145.1A EP14748145A EP3025049A1 EP 3025049 A1 EP3025049 A1 EP 3025049A1 EP 14748145 A EP14748145 A EP 14748145A EP 3025049 A1 EP3025049 A1 EP 3025049A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- needle
- pressure
- control chamber
- nozzle
- control
- 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.)
- Granted
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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic 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
- 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
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
- F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic 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
- F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
- F02M2547/008—Means for influencing the flow rate out of or into a control chamber, e.g. depending on the position of the needle
Definitions
- the present invention relates to a fuel injector for vehicle engines. It deals particularly with the control system of the injector.
- the fuel injectors are provided with a needle moving in a tubular body.
- the movements of the needle are a function of a pressure difference between an upstream control chamber and the downstream nozzle.
- the fuel flows into the body from an inlet mouth to the injection nozzle.
- the fuel passes in particular by a restriction which creates a pressure drop so that the fuel injected by the nozzle is less than that arriving at the inlet mouth.
- the difference is of the order of 200 bars.
- the present invention aims to solve these problems by providing a pressurized fuel injector comprising a tubular body extending along a longitudinal axis and forming at one end a nozzle.
- the fuel circulates in the body between an inlet mouth and the nozzle and also comprising a needle arranged axially in the body and able to move between an open nozzle position and a closed nozzle position, the fuel flowing in the space between needle and the inner side of the body.
- the needle is controlled according to a pressure difference between a first control chamber into which the upstream end of the needle opens and the nozzle downstream, the pressure in the first control chamber being regulated by a control valve.
- the injector is further provided with a complementary means for controlling the needle cooperating with the first control chamber so that the fuel pressure at the inlet mouth is integrally transmitted to the nozzle. 'injection.
- the complementary control means comprises a second control chamber arranged in the needle and connected to said space by a calibrated orifice.
- the needle is provided with an axial blind bore opening into the upstream end of the needle, the bore forming the second control chamber.
- the additional control means further comprises a shutter member secured to the body and arranged to close the upstream portion of the second control chamber.
- the shutter member is a cylindrical piston whose section is slidably adjusted to that of the bore of the needle, the cylindrical piston being in abutment against a wall of the first control chamber.
- the complementary control means further comprises a filling channel of the second control chamber and another passive valve opening or closing said filling channel.
- said other passive valve comprises an elastic member continuously urging a shutter member against a seat circumventing the opening of the filling channel in the second control chamber.
- the process for injecting pressurized fuel comprises the steps of:
- the step of activating comprises the following steps:
- the injector the activating step comprising the following steps: - Open the control valve, the depression created initiating the movement of the needle, the fuel trapped in the second control chamber, escaping through the orifice calibrated so that the opening speed of the nozzle is controlled , the pressure of the fuel injected by the nozzle, being equal to the pressure at the inlet mouth.
- an injector characterized in that the setting of the spring is low enough to allow sealing of the ball on its seat.
- FIG. 1 given by way of nonlimiting example and showing an axial sectional diagram of a injector according to the invention.
- An internal combustion engine (not shown) comprises an injection system provided with one or more injectors 10 which extends along a longitudinal axis Z.
- the injector is provided with a tubular body 12 defining an interior space E in which circulates fuel C pressurized between an inlet mouth 14 upstream and an injection nozzle 16 forming the downstream tip of the body 12.
- a needle 18 slidable between an open nozzle position PO, needle “up” in the direction of the figure, and a closed nozzle position PF needle down ".
- the needle 18 extends from an upstream end 20 opening into a control chamber 22 to a downstream end 24 in the nozzle 16.
- the control chamber 22 is made in a thick plate 26 integral with the body 12, the fuel arriving by a first channel 28 and starting with a control channel 30 whose opening and closing are controlled by a control valve 32 controlled by an electromagnet 34.
- the needle 18 is provided with an axial blind bore 36 opening only through the upstream end 20 of the needle 18.
- a calibrated orifice 38 of small section At the bottom of the bore 36 extends radially a calibrated orifice 38 of small section.
- the orifice 38 passes through the needle 18 from the bore 36 until it opens into the space E.
- the bore 36 is also in fluid communication with the space E by means of a filling channel 40.
- the channel 40 of large section extends from the bottom 42 of the bore 36 to the wall of the outside of the needle.
- the channel 40 comprises an axial portion connected to the center of a radial passage opening on either side of the needle.
- Other embodiments are of course possible, for example in a single section at an angle.
- a piston 44 which has the shape of a cylinder of revolution whose upper end 46 is in abutment against the transverse wall 48 of the thick plate 26, forming an imaged manner like this is visible in Figure 1, the "ceiling" of the control chamber 22.
- the piston 44 extends in the bore 36 to a lower end 50 remote from the bottom 42 of the bore 36.
- the space of the bore located below the piston 44 forms a second control chamber 52 into which the calibrated orifice 38 and the filling channel 40 open.
- a passive valve 54 comprising a ball 56 permanently biased by a spring 58 against a seat 60 formed at the bottom of the bore 42 and circumnavigating the arrival of the filling channel 40.
- the spring 58 is compressed between the ball 56 and the lower end 50 of the piston 44.
- Many passive valve construction alternatives exist in particular by replacing the ball by another shutter member such as a flat tip attached to the end of the spring.
- the geometry of the valve seat is then chosen complementary to that of the shutter member.
- the injector 10 of FIG. 1 is represented in the open nozzle position PO, the needle being at the top, the fuel C leaving the nozzle 16 at the same pressure as that arriving at the inlet mouth, and therefore without any loss of pressure in the course inside the injector 10.
- the control valve 32 is activated and the control channel 30 is open allowing the fuel to escape, the pressure in the control chamber having fallen sharply so that the pressure in the nozzle 16 prevails.
- the pressure of the fuel at the nozzle exerts on the needle an axial force Fl directed upwards so that the needle 18 is held "up”.
- the piston 44 bears against the ceiling of the control chamber 22, the volume of the second control chamber 52 is thus minimized.
- the ball 56 biased by the spring 58 closes the filling channel 40.
- the transient phase from the open nozzle position to the closed nozzle position is now described. From the open nozzle position, the control valve 32 is activated to close the control channel 30. From this moment, the pressurized fuel C enters the first channel 28 into the control chamber 22, now called the first chamber 22 and in the second control by the calibrated orifice 38 and by the filling channel 40. The pressure in the chamber 22 increases sharply until reaching the input pressure value 14. The pressurized fuel in the first control chamber 22 and the second control chamber 52 exert a force on the axial end of the needle facing the nozzle. The pressure in the second control chamber 52 is equal to the pressure at the inlet of the injector.
- This force F2 initiates the movement of the needle 18 because the pressure is exerted on the upstream of the needle, to which is added the force F3 exerted in the second chamber 52 facing downwards.
- the sum of the two forces F2 and F3 comes to oppose the force Fl which is exerted on the downstream end of the needle and oriented upwards.
- the sum of the forces F2 and F3 are greater than the force F1 and thus the needle goes down.
- the volume of the second control chamber increases there creating a pressure drop,
- the ball 56 moves away from the seat 60 so that the fuel C pressurized easily enters the second control chamber through the filling channel 40 now open.
- the movement of the needle 18 downwards is accelerated until the needle 18 is in abutment in the closed nozzle position PF.
- the closed nozzle position PF is now described.
- the control channel is always closed and the pressure in the first control chamber is at the inlet pressure.
- the piston 44 is still resting against the ceiling of the first control chamber 22 and the needle is down in the closed nozzle position and the volume of the second control chamber 52 is now maximized.
- the ball 56 has moved back against the seat 60, closing the filling channel 40.
- the pressure in the second control chamber 52 is then identical to the inlet pressure.
- the output of the fuel is limited by the small section of the calibrated orifice 38, thereby limiting the speed of ascent of the aiguillel8.
- the needle moving to the up position as previously described.
- the role of the calibrated orifice 38 thus clearly appears as a retarder of the ascent of the needle.
- an alternative construction could replace the calibrated orifice 38 with any other valve solution.
- the piston 44 is in permanent contact with the thick plate 26 and could be fixed or integrated therewith.
- a piston attached to the plate would create a hyperstatic axial guidance of the needle already guided in the body at the bottom. It is therefore interesting to keep the piston a degree of transverse freedom.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14748145.1A EP3025049B1 (en) | 2013-07-23 | 2014-07-21 | Fuel injector |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13177670.0A EP2829717A1 (en) | 2013-07-23 | 2013-07-23 | Fuel injector |
EP14748145.1A EP3025049B1 (en) | 2013-07-23 | 2014-07-21 | Fuel injector |
PCT/EP2014/065637 WO2015011097A1 (en) | 2013-07-23 | 2014-07-21 | Fuel injector |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3025049A1 true EP3025049A1 (en) | 2016-06-01 |
EP3025049B1 EP3025049B1 (en) | 2017-05-17 |
Family
ID=48803481
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13177670.0A Withdrawn EP2829717A1 (en) | 2013-07-23 | 2013-07-23 | Fuel injector |
EP14748145.1A Not-in-force EP3025049B1 (en) | 2013-07-23 | 2014-07-21 | Fuel injector |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13177670.0A Withdrawn EP2829717A1 (en) | 2013-07-23 | 2013-07-23 | Fuel injector |
Country Status (5)
Country | Link |
---|---|
US (1) | US20160153412A1 (en) |
EP (2) | EP2829717A1 (en) |
KR (1) | KR20160033108A (en) |
CN (1) | CN105408615B (en) |
WO (1) | WO2015011097A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3045109B1 (en) * | 2015-12-11 | 2018-01-05 | Delphi Technologies Ip Limited | FUEL INJECTOR |
FR3080891B1 (en) * | 2018-05-03 | 2020-10-09 | Delphi Tech Ip Ltd | FUEL INJECTOR FOR INTERNAL COMBUSTION ENGINE |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0711996A (en) * | 1993-06-25 | 1995-01-13 | Hino Motors Ltd | Combustion controller of diesel engine |
JP3832140B2 (en) * | 1999-05-21 | 2006-10-11 | いすゞ自動車株式会社 | Needle valve lift damper |
DE60025939T2 (en) * | 2000-11-17 | 2006-09-21 | Delphi Technologies, Inc., Troy | NADELHUBDÄMPFER OF A INJECTOR FOR FUEL INJECTION AND DAMPING PROCESS |
AT500774B8 (en) * | 2004-08-06 | 2007-02-15 | Bosch Gmbh Robert | DEVICE FOR INJECTING FUEL IN THE COMBUSTION ENGINE OF AN INTERNAL COMBUSTION ENGINE |
DE102007011789A1 (en) * | 2007-03-12 | 2008-09-18 | Robert Bosch Gmbh | fuel injector |
ATE546636T1 (en) * | 2009-08-26 | 2012-03-15 | Delphi Tech Holding Sarl | FUEL INJECTOR |
DE102010039048A1 (en) * | 2010-08-09 | 2012-02-09 | Robert Bosch Gmbh | Injector |
JP5817460B2 (en) * | 2011-11-18 | 2015-11-18 | トヨタ自動車株式会社 | Fuel injection device for internal combustion engine |
-
2013
- 2013-07-23 EP EP13177670.0A patent/EP2829717A1/en not_active Withdrawn
-
2014
- 2014-07-21 WO PCT/EP2014/065637 patent/WO2015011097A1/en active Application Filing
- 2014-07-21 EP EP14748145.1A patent/EP3025049B1/en not_active Not-in-force
- 2014-07-21 US US14/906,635 patent/US20160153412A1/en not_active Abandoned
- 2014-07-21 KR KR1020167001335A patent/KR20160033108A/en not_active Application Discontinuation
- 2014-07-21 CN CN201480041760.5A patent/CN105408615B/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2015011097A1 * |
Also Published As
Publication number | Publication date |
---|---|
KR20160033108A (en) | 2016-03-25 |
WO2015011097A1 (en) | 2015-01-29 |
EP2829717A1 (en) | 2015-01-28 |
US20160153412A1 (en) | 2016-06-02 |
CN105408615B (en) | 2017-12-12 |
CN105408615A (en) | 2016-03-16 |
EP3025049B1 (en) | 2017-05-17 |
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