EP4088017A1 - Actionneur électromagnétique - Google Patents
Actionneur électromagnétiqueInfo
- Publication number
- EP4088017A1 EP4088017A1 EP20823858.4A EP20823858A EP4088017A1 EP 4088017 A1 EP4088017 A1 EP 4088017A1 EP 20823858 A EP20823858 A EP 20823858A EP 4088017 A1 EP4088017 A1 EP 4088017A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat
- coil
- actuator
- elastic member
- control rod
- 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
- 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
- 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
-
- 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
- F02M2200/26—Fuel-injection apparatus with elastically deformable elements other than coil springs
-
- 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
- F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
Definitions
- the present invention relates to an electromagnetic actuator for a fuel injector used in vehicle engines.
- Fuel injection systems for modern internal combustion engines, particularly compression ignition engines, include a plurality of fuel injectors arranged to emit an atomized jet of high pressure fuel. in a combustion chamber of the engine.
- a fuel injector known for use in such a system It includes an injection needle. The needle slides within the bore formed in a nozzle body and can cooperate with a seat to control the delivery of fuel through one or more outlet openings. The movement of the needle is controlled using a high pressure control chamber and a low pressure chamber that communicates with the low pressure drain tank.
- an actuator is electrically supplied to effect the opening, which causes the displacement of an armature and a valve element, also called a valve stem by professionals, in contact with it.
- control valve identified as a control valve.
- the control valve is located in the low pressure chamber, the control valve then moves upward against the action of an actuator coil spring.
- the length of the spring is reduced and an oscillation propagates from turn to turn to then propagate on the control valve and the oscillation thus goes back and forth creating disturbances in the flow of fuel.
- the propagation of the oscillation disrupts the movement of the reinforcement integral with the valve. This generates high frequencies which disturbs the multiple injections. Oscillations occur in the forces applied to close or open the control valve. This problem is explained by a disturbed movement of the armature caused by oscillations undergone by the spring. This problem will be solved by the present invention, which will be described later.
- the present invention aims to solve the problem of displacement of the armature caused by the oscillations undergone by the spring.
- the invention consists of an electromagnetic actuator of a diesel fuel injector.
- the actuator comprises a fixed electric coil provided with an axial blind hole, an elastic device compressed between a pin and a control rod moving towards the coil when the latter is electrically supplied.
- the resilient device permanently pushes a valve assembly including the control rod attached to a magnetic frame to a position remote from the coil.
- the valve assembly includes the elastic device arranged in a blind hole.
- the elastic device comprises an elastic member and a heat-shrinkable element encapsulating the elastic member.
- the heat-shrinkable element is further heat-shrunk around the elastic member.
- the heat-shrinkable element has a wall of substantially constant thickness.
- the elastic member is a compression coil spring.
- a diesel fuel injector comprises an electromagnetic actuator as described above.
- FIG 1 is an axial section of the electromagnetic actuator according to the invention comprising an encapsulated spring.
- FIG 2 is a sectional view of the invention comprising a heat shrinkable member, a spring and an elastic member.
- top-to-bottom orientation is arbitrarily chosen and, words and phrases such as "above, below, above, below " may be used without any intention of limit the invention.
- FIG. 1 is shown a part of the injector 10 of diesel fuel according to the invention.
- the injector 10 includes a needle 12 sliding in a bore 14.
- the injector 10 extends along a longitudinal axis X.
- the movement of the needle 12 is controlled using two chambers, a high pressure control chamber 16 and a low pressure chamber 18, which communicates with the low pressure drain tank.
- an actuator 20 comprising a coil 22 and which is electrically supplied during the opening step, engages a movable magnetic armature 24 moving towards the coil 22 and a valve element 26 in contact and fixed to it. Armature 24.
- the valve member 26 is also referred to as the control rod 26.
- the control rod 26 and the armature 24 attached together constitute a valve assembly 28.
- the valve assembly 28 located in the chamber. low pressure 18, moves upward against the action of an elastic device 30 of the actuator 20, thus the valve assembly 28 moves away from its seat.
- the fuel can escape from the control chamber 16 to the low pressure chamber 18 which is at a low pressure of the order of 5 bar with peaks of up to 25 bar through a return passage (not shown). .
- the electromagnetic actuator 20 of the diesel fuel injector 10 comprises a calibration pin 32 and the elastic device 30 compressed between the pin 32 and the control rod 26.
- the elastic device 30 pushes back. permanently the valve assembly 28 to a position remote from the coil 22.
- the resilient device 30 is arranged in an axial blind hole 34.
- the elastic device 30 comprises an elastic member 36 and a heat-retractable element 38 encapsulating the elastic member 36.
- the elastic device 30 is compressed between the pin 32 arranged in the bottom of the blind hole 34 and the control rod 26.
- the heat element retractable 38 is heat-shrunk around the elastic member 36.
- the heat-shrinkable element 38 has a wall of substantially constant thickness with a value of 0.05 mm after shrinking.
- the resilient member 36 is a coil spring 36 of compression.
- the elastic member 36 is arranged in the axial blind hole 34.
- the axial helical spring 36 extends along the longitudinal axis X.
- the helical spring 36 extends between a first coil 40 in contact with the magnetic armature 22 and a last coil 42 in contact with the pin 32.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2000185A FR3106161B1 (fr) | 2020-01-09 | 2020-01-09 | Actionneur électromagnétique |
| PCT/EP2020/086458 WO2021139983A1 (fr) | 2020-01-09 | 2020-12-16 | Actionneur électromagnétique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4088017A1 true EP4088017A1 (fr) | 2022-11-16 |
| EP4088017B1 EP4088017B1 (fr) | 2024-10-23 |
Family
ID=70008866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20823858.4A Active EP4088017B1 (fr) | 2020-01-09 | 2020-12-16 | Actionneur électromagnétique |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4088017B1 (fr) |
| FR (1) | FR3106161B1 (fr) |
| WO (1) | WO2021139983A1 (fr) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3024499B1 (fr) * | 2014-07-31 | 2019-05-03 | Delphi Technologies Ip Limited | Actionneur a double ressort |
| FR3055370B1 (fr) * | 2016-09-01 | 2020-05-01 | Delphi Technologies Ip Limited | Ensemble de bobine |
-
2020
- 2020-01-09 FR FR2000185A patent/FR3106161B1/fr active Active
- 2020-12-16 EP EP20823858.4A patent/EP4088017B1/fr active Active
- 2020-12-16 WO PCT/EP2020/086458 patent/WO2021139983A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| FR3106161B1 (fr) | 2021-12-03 |
| WO2021139983A1 (fr) | 2021-07-15 |
| EP4088017B1 (fr) | 2024-10-23 |
| FR3106161A1 (fr) | 2021-07-16 |
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