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
  • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
  • F02M35/10—Air intakes; Induction systems
  • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
  • F02M35/10229—Fluid connections to the air intake system; their arrangement of pipes, valves or the like the intake system acting as a vacuum or overpressure source for auxiliary devices, e.g. brake systems; Vacuum chambers

Definitions

• the present invention relates to a circuit for venting at least one control solenoid valve and a heat engine incorporating such a circuit.
• a solenoid valve As examples of use of a solenoid valve, there may be mentioned a variable geometry valve of a turbocharger, a valve or discharge valve disposed at the exhaust outlet of a turbocharger, a valve for the air metering device, a valve for the bypass line of the charge air cooler or RAS and a valve for the branch containing said cooler, a valve for the bypass pipe of the recirculated exhaust gas or EGR and a valve for the branch containing said bypass duct, a valve for an air connection system at the inlet of the turbocharger or RET and a valve for the braking assistance systems requiring a source of depression or even of partial vacuum.
• Figures 1 and 2 of this patent application show an example of protection of a vent circuit of one or solenoid valves 2 on a motor 1.
• the venting element 8, carried by one end of the venting circuit, is visible in FIG. 2.
• the venting circuit can be connected to one or more solenoid valves 2.
• this solenoid valve 2 is linked to the control of a turbocharger 3, for example for variable geometry control or the discharge valve.
• the breather element 8 of this solenoid valve 2 is located at the rear of the engine 1, under the air filter 4.
• the filter Air 4 exerts a protective action of the air element 8 by covering it, as shown in Figure 1 and despite this relatively well protected location for said element, there are still some risks related to this position.
• the document FR-A-2 913 224 describes a system forming a vacuum circuit in a motor vehicle.
• the primary pipe connecting the vacuum generator and at least one pneumatic receiver is connected to means for bringing the primary pipe to atmospheric pressure when the vacuum generator is at a standstill.
• the means for setting atmospheric pressure comprise a secondary pipe connected to the primary pipe and opening to the atmosphere opposite the primary pipe through an air filter.
• the problem underlying the present invention is to allow the vent element of a vent circuit of at least one control solenoid valve and said circuit to be protected from splashing water or condensing water in a simple and effective way.
• a circuit for venting at least one solenoid valve in a heat engine comprising at one end a venting element, characterized in that the venting element is housed in a protective volume surrounding it in a sealed manner, this protection volume comprising means for connecting and pressurizing said volume with an inlet duct of air present on the heat engine or an element carried by said pipe in order to put said volume at the air pressure prevailing in said pipe.
• the technical effect is to obtain effective protection of the vent element of said circuit by protecting said element against condensation of water, splashing water or impurities.
• the venting circuit according to the invention may further optionally have any of the following features: the connection means and pressurizing the protective volume comprise a series of orifices of communication between said volume and the air intake duct and said volume has a sealed receiving tip surrounding the end of the circuit carrying the vent element.
• the venting circuit comprises a plurality of venting circuits of a respective solenoid valve and a venting element common to said circuits at one end, each of said circuits having a venting element therein respective, the venting elements of each of said circuits being grouped in a splitter connected to the common venting element, this common venting element being housed in the protection volume.
• the invention also relates to a heat engine having at least one air intake pipe, characterized in that it comprises such a circuit for venting at least one solenoid valve.
• the protection volume surrounding the vent element is in the form of a box, said box being connected to the air filter of the intake pipe. of air to the intake manifold of the engine.
• the box is attached directly to an air filter tank present on the engine by fixing means.
• the means of connection and pressurization of the box are in the form of a series of communication orifices
• said communication orifices between the box and the air filter are carried by a grid, said grid having sealing means secured with said box.
• said box when the box has a sealed receiving tip surrounding the end of the circuit carrying the vent element, said box comprises a series of passages putting said nozzle to the pressure in the box.
• the heat engine has at least one turbocharger and the protection volume surrounding the vent element is in the form of a plenum, said chamber being connected to the inlet air connection of the turbocharger upstream of the crankcase recirculation tapping.
• connection and pressurizing means of the plenum chamber are in the form of a series of communication orifices, said communication orifices are directly drilled in the wall of the air connection. turbocharger inlet.
• the invention finally relates to a motor vehicle, characterized in that it comprises such a heat engine.
• FIG. 1 is a Schematic representation of a top view in perspective of an engine according to the state of the art
• Figure 2 is a schematic representation of a perspective top view of a portion of an engine according to the state of the art. 2, the air filter having been removed and the air element being visible in this figure
• FIG. 3 is a diagrammatic representation of a view of FIG. top perspective view of a motor according to a first embodiment of the invention, a box containing the vent element having been added to the air filter of the engine
• FIG. 4 is a schematic representation of a top view in perspective, enlarged with respect to FIG.
• FIG. 5 is a diagrammatic representation of a view from below in perspective, enlarged with respect to FIG. 3, of part of a motor according to the first embodiment of the invention, showing in particular the box and its orifices of communication with the air filter
• FIG. 6 is a schematic representation of a perspective side view, enlarged with respect to FIG. of a part of an engine according to the first embodiment of the invention, showing in particular the box and its orifices of communication with the air filter and the seal for the gate carrying the communication orifices
• the fig 7 is a diagrammatic representation of a perspective view, enlarged with respect to FIG.
• FIG. 8 is a diagrammatic representation of a perspective view, enlarged with respect to FIG. 3 and in another angle of view, as in FIGS. 6 and 7, of a part of an engine according to the first embodiment of the invention, showing in particular the box, the vent element with its tip and the passage communicating said element to the box,
• Figure 9 is a schematic representation of a perspective top view of an engine according to a second embodiment of the invention.
• FIG. 10 is a schematic representation of a perspective top view, enlarged with respect to FIG. 9, of a part of an engine according to the second embodiment of the invention showing in particular the plenum containing the air-blast element associated with the air connection to the 11 is a schematic representation of a perspective side view, enlarged with respect to FIG. 9, of an air connection at the compressor inlet and a venting circuit.
• this air connection comprising the plenum containing the vent element
• Figure 12 is a schematic representation of a side view in perspective, partially cut off. and enlarged from Figure 11 of an air connection to the compressor inlet according to the second embodiment of the invention this air connection comprising the plenum containing the vent element, the separation between plenum and air connection to the compressor inlet being particularly well visible in this figure.
• a protective volume sealingly surrounding the air vent element of the venting circuit, this protection means comprising means for connection and setting. pressurizing said volume with an air intake pipe present on the heat engine or an element carried by said pipe in order to bring said volume to the air pressure prevailing in said pipe.
• an air intake pipe present on the heat engine or an element carried by said pipe in order to bring said volume to the air pressure prevailing in said pipe.
• Such a pipe may be part of the main air intake circuit to the engine air collector or be an air supply line of an auxiliary device present on the engine, for example a turbocharger.
• the protection means may be connected to any element on the air intake duct, for example an air filter in the case of a duct forming part of the main air intake circuit at the air intake manifold. air.
• Figures 3 to 8 illustrate the first embodiment of the present invention. In this embodiment, it is intended to permanently shelter from water the free air element 8, visible in Figure 5 and being disposed at the free end of a circuit venting at least one solenoid valve 2.
• the protective volume is a box 5 and the air intake pipe present on the engine is the air intake pipe to the intake manifold of the thermal engine 1, this duct carrying an air filter 4 as an element to which the casing 5 is connected.
• a box 5 attached directly to the tank of the air filter 4.
• the box 5 has two fasteners 6, for example screws, for its attachment to the cylinder head cover 7 forming also the tank for receiving the air filter 4, as shown in Figures 3 and 4.
• the box 5 is, on its underside, closed by a grid 9, fixed with two screws 10 as securing means to the box 5.
• the grid 9 is pierced by a series of orifices 11, for putting the box 5 at atmospheric pressure by making it communicate with the air filter 4.
• the orifices 11 may form two parallel lines in the length of the grid 9.
• the grid 9 and the orifices 11 form the connecting and pressurizing means according to the present invention.
• a seal 12 may be interposed between the grid 9 and the box 5, to complete the watertightness of said box 5. Any other securely sealed mode of attachment that the screws 10 of the grid 9 on the box 5 can be considered.
• This joining method may be, for example, by gluing or welding, which may render unnecessary the seal 12, sealing being then guaranteed without adding a specific element.
• a tip 13 carried by the box 5 is disposed at the far left of the tank of the air filter 4. On said tip 13 is connected to the setting element in air 8, visible in FIG. 5, of the circuit for venting the solenoid valve, the venting element penetrating through said nozzle 13. As shown in particular in FIG. two horizontal passages 14 allow to put in communication said end element 8 to the box 5 placed at atmospheric pressure.
• the box 5 has two lugs 15 each carrying a recess for the passage of the fixing means 6 of the box 5 to the tank of the air filter formed on the lid of cylinder head.
• FIGS. 9 and 10 illustrate the second embodiment of the present invention.
• free air 19 of the solenoid valve 2 by positioning it in a plenum chamber 18 communicating with the air inlet connection 16 turbocharger or RET, this in the air line in depression, upstream of the recycling tapping 17 crankcase gases.
• the recycling of the crankcase gases is to recycle the combustion gases, migrating mainly by piston segmentation, directly to the engine air intake, after ensuring deoiling.
• Such a recycling of the gases can present risks of pollution of the plenum 18.
• the volume of protection is a plenum 18 and the driving air intake present on the engine is the inlet air inlet 16 of the turbocharger.
• this configuration is not preferred because there are many risks for the control solenoid valve 2, this solenoid valve 2 can be the solenoid valve of the turbocharger 3, these risks being related to the presence near the quilting of recycling 17 of the crankcase gases that can cause oil lifts or vapors.
• a plenum 18 outside the air inlet fitting and communicating with said fitting is therefore preferred.
• the plenum chamber 18 is preferably directly grafted at the upper part of the air connector 16 and in said chamber 18 is connected to the circuit 19 of venting the solenoid valve 2, this circuit being particularly visible in Figure 10.
• the wall 20 of the air inlet connection 16 or RET is perforated with a series of orifices 21 carried by a separation 22 between plenum chamber 18 and connection of air intake 16.
• the wall 20 and the orifices 21 form the connecting and pressurizing means according to the present invention.
• the separation 22 carrying the series of orifices 21 limits the risk of disturbances in the connection of the solenoid valve with the air connection, these disturbances being essentially due to the risings or the oil vapors due to the presence very close to the crankcase recycling tap, as shown under reference 17 in Figure 11.
• venting circuit 19 of each of them is advantageously connected to a distributor, itself connected to the box 5 or to the plenum chamber 18.
• an air vent circuit 19 comprising several venting circuits of a respective solenoid valve 2 and a common venting element 8 to said circuits at one end, each of said circuits having a respective venting element, the venting elements of each of said circuits being grouped together in a splitter connected to the common venting element 8, this setting element the common air 8 being housed in the protective volume in the form of the box 5 or the plenum 18.
• a main advantage obtained by each of the two embodiments of the invention is essentially the complete protection of the venting of at least one solenoid valve, vis-à-vis the projections of water and water. oil, this by integrating the vent end element in a box connected to the air filter or in a plenum connected to the turbocharger air inlet fitting.
• the separation 22 may be part of the wall of the air inlet 16 which reduces the cost of a plenum 18.
• the protective volume in the form of a box 5 or a volume of tranquilization 18 may form an irremovable portion of the pipe 16 air intake present on the thermal engine 1 or element 4 of said pipe to which it is connected.
• the protective volume 5, 18 can thus be fixed to the pipe 16 or to said element 4 by bonding, welding or crimping on said pipe 16 or on said element 4.
• the protective volume 5, 18 can be removable from said pipe 16 or said element 4 being fixed, preferably in a sealed manner, to said pipe 16 or to said element 4 by removable fastening means, for example screws, clips or staples.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
• Supercharger (AREA)
• Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Applications Claiming Priority (2)

Publications (3)

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ID=47436040

Family Applications (1)

Country Status (3)

Families Citing this family (2)

Family Cites Families (4)

• 2011
  • 2011-12-20 FR FR1162011A patent/FR2984412B1/fr not_active Expired - Fee Related
• 2012
  • 2012-11-22 EP EP12806542.2A patent/EP2795090B8/de active Active
  • 2012-11-22 WO PCT/FR2012/052689 patent/WO2013093267A1/fr active Application Filing

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