EP3452715A1 - Systeme de controle des emissions d'un vehicule automobile - Google Patents
Systeme de controle des emissions d'un vehicule automobileInfo
- Publication number
- EP3452715A1 EP3452715A1 EP17725712.8A EP17725712A EP3452715A1 EP 3452715 A1 EP3452715 A1 EP 3452715A1 EP 17725712 A EP17725712 A EP 17725712A EP 3452715 A1 EP3452715 A1 EP 3452715A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- solenoid valve
- reduced
- section
- motor vehicle
- outlet duct
- 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
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
-
- 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
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/089—Layout of the fuel vapour installation
Definitions
- the present invention relates to a solenoid valve of a system for controlling emissions by evaporation of fuel and a motor equipped with such a solenoid valve and a motor vehicle equipped with such a motor.
- An evaporative emission control system 10 as shown in FIG. 1 comprises a reservoir 12 for the temporary recovery and trapping of the gaseous fuel from the fuel storage tank 14.
- This recovery tank 12 is connected to the fuel intake system 16 of the engine via a solenoid valve 18 whose degree of opening determines the amount of fuel vapor which is fed back into the engine.
- the solenoid valve is controlled opening and closing by a computer 20 of the vehicle which determines the optimum conditions for the reinjection of fuel vapors.
- the purge solenoid valves 18 comprise an outlet duct 22 connected to the fuel inlet which comprises a reduced-section portion 24 connected upstream and downstream to substantially frustoconical portions 26, 28 with a flaring section. upstream and downstream, respectively ( Figure 2).
- This portion 24 with reduced cross-section or neck generally comprises an inner annular face which is curved along the axis of flow of the fluid through said portion 24.
- the solenoid valve 18 also comprises a movable valve 30 actuated by displacement by a bobbin 32 and a seat 34 for closing the fluid circulation in the solenoid valve.
- This type of configuration of the outlet pipe 22 does not provide a good compromise between the pressure drop and the flow. Indeed, the variation of the dimensions of the pipe such as the section of the reduced section portion or the dimensions of the frustoconical portions not possible to obtain good results since an increase in the section of the neck induces not only an increase of the flow but also an increase of the pressure loss whereas it would be advisable to maximize the flow while minimizing the associated pressure loss ..
- the invention proposes to provide an effective, simple and economical solution to the aforementioned problems.
- a solenoid valve comprising an outlet duct connected to a fuel intake circuit in the engine, characterized in that the outlet duct of the solenoid valve comprises a portion of reduced section having a substantially cylindrical shape.
- the replacement of the neck of the prior art by a reduced-section zone having a cylindrical shape significantly reduces the pressure drop in the conduit while having a limited impact on the decrease in flow.
- said reduced-section portion extends axially over a distance of between approximately 0.2 and 2 millimeters and preferably over an axial distance of between 0.5 and 1 millimeter.
- said reduced section portion has a diameter of between about 2 and 7 millimeters.
- the reduced section pipe portion is connected upstream and downstream to two frustoconical portions with section increasing in opposite directions to the reduced section portion.
- the invention also relates to a system for controlling emissions by evaporation in a motor vehicle, comprising a fuel storage tank connected to a fuel gas particle retention tank, said holding tank being connected at the output to a solenoid valve comprising an outlet duct connected to a fuel intake circuit in the engine, characterized in that the duct output of the solenoid valve comprises a reduced section portion having a substantially cylindrical shape.
- the invention also relates to a motor vehicle engine comprising a system for controlling gaseous fuel emissions as described above.
- the invention also relates to a motor vehicle comprising a motor as above.
- FIG. 1, previously described, is a schematic view of a system for controlling pollutant emissions by evaporation
- FIG. 2 is a schematic view of a purge solenoid valve of a fuel gas particle retention tank
- FIG. 3 is a schematic view of an outlet duct in a purge solenoid valve according to one embodiment of the invention.
- FIG. 4 is a graph showing the evolution of the flow rate as a function of the pressure drop at the outlet of the solenoid valve of FIG. 2 (curve A) and in the duct of FIG. 3 (curve B);
- FIG. 5 is a graph showing the variations in flow rate and pressure drop as a function of the length of the reduced section cylindrical portion of the solenoid valve duct according to the invention
- FIG. 6 is a schematic view of an outlet duct in a purge solenoid valve according to one embodiment of the invention.
- FIG. 3 shows a conduit 36 output of a purge solenoid valve according to the invention.
- the solenoid valve 18b may be, with the exception of the outlet duct 36, completely identical to the solenoid valve 18a shown in FIG. be mounted in the circuit of Figure 1 at the same location as the solenoid valve 18a.
- the outlet duct 36 comprises a reduced section pipe portion 38 having a substantially cylindrical shape. This portion 38 is connected upstream to a frustoconical upstream portion 40 with section increasing upstream and downstream to a frustoconical portion 42, 42 'section increasing downstream.
- the frustoconical portions 40, 42 ' are asymmetrical to each other with respect to a plane substantially perpendicular to the cylindrical portion 38.
- the frustoconical portions 40, 42 are symmetrical to one another with respect to a plane substantially perpendicular to the cylindrical portion 38.
- upstream end of the upstream frustoconical portion 40 may be connected to another cylindrical portion 44 of junction with the downstream face of the seat of the valve.
- downstream end of the downstream frustoconical portion 42, 42 ' is connected to a downstream cylindrical pipe 46.
- the invention thus proposes to replace the section portion of the reduced section of the prior art by the reduced section portion of Figures 3 and 6 so as to minimize the pressure drop while limiting the degradation of the flow.
- FIG. 4 is a graph showing the evolution of the flow rate (for example in Kg / h) as a function of the pressure drop (for example in mbar) or the pressure difference between the upstream and the downstream of the solenoid valve.
- the curve referenced A is relative to the outlet pipe portion 22 as shown in FIG. 2 and FIG. B relates to the pipe portion 38 shown in FIGS. 3 and 6.
- curve B has a larger slope so that the maximum flow rate threshold is reached more rapidly than for curve A.
- the use of a cylindrical reduced section portion having a cylindrical shape makes it possible to maintain a substantially identical threshold flow while reducing the pressure drop since the beginning of the plate is shifted on curve B with respect to curve A on the x-axis.
- the graph of FIG. 5 represents the evolution of the evolution rate of the flow (left histogram) and of the rate of pressure drop (right histogram) as a function of the length of the reduced-section portion 38 of cylindrical shape.
- the reference is taken to 0 where it is observed that there is, of course, no gain or loss.
- the increase in the length of the reduced section portion 38 is accompanied by a decrease in the rate of flow, which means that the longer the length of the reduced section portion 38 is increased the flow rate decreases in comparison with a reduced-section portion without a cylindrical portion, that is to say one-off or quasi-point portion. This corroborates well the observation made in FIG.
- the pipe has an axial dimension of between 0.2 and 2 millimeters. According to another embodiment of the invention, the pipe has an axial dimension of between 0.5 and 1 millimeter. According to another embodiment of the invention, the pipe has an axial dimension equal to 1 mm.
- Said reduced section portion preferably has a diameter of between about 2 and 7 millimeters.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Magnetically Actuated Valves (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1654038A FR3051020B1 (fr) | 2016-05-04 | 2016-05-04 | Systeme de controle des emissions d'un vehicule automobile |
| PCT/FR2017/051061 WO2017191413A1 (fr) | 2016-05-04 | 2017-05-03 | Systeme de controle des emissions d'un vehicule automobile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3452715A1 true EP3452715A1 (fr) | 2019-03-13 |
| EP3452715B1 EP3452715B1 (fr) | 2025-10-01 |
Family
ID=58054180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP17725712.8A Active EP3452715B1 (fr) | 2016-05-04 | 2017-05-03 | Système de contrôle des émissions d'un véhicule automobile |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3452715B1 (fr) |
| FR (1) | FR3051020B1 (fr) |
| WO (1) | WO2017191413A1 (fr) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0777041B1 (fr) * | 1995-11-25 | 2002-03-13 | Cummins Engine Company, Inc. | Moteur à combustion interne avec un capteur des gaz de combustion imbrûlés et un procédé pour évaluer la performance d'un moteur à combustion interne |
| US5967183A (en) * | 1998-01-13 | 1999-10-19 | Eaton Corporation | Controlling vapor flow in a conduit |
| US6666192B2 (en) * | 2001-11-14 | 2003-12-23 | Delphi Technologies, Inc. | Fluid control valve and system |
-
2016
- 2016-05-04 FR FR1654038A patent/FR3051020B1/fr active Active
-
2017
- 2017-05-03 WO PCT/FR2017/051061 patent/WO2017191413A1/fr not_active Ceased
- 2017-05-03 EP EP17725712.8A patent/EP3452715B1/fr active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017191413A1 (fr) | 2017-11-09 |
| FR3051020A1 (fr) | 2017-11-10 |
| FR3051020B1 (fr) | 2020-03-20 |
| EP3452715B1 (fr) | 2025-10-01 |
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