Blow-by gas filtration assembly

Abstract

The invention is a blow-by gas filtration assembly (1) for a ventilation system (800) of a crankcase (550) of a hydrogen-powered internal combustion engine (500) of a vehicle (900), comprising: an assembly body (2) comprising a gas-to-be-filtered inlet mouth (21) and a filtered-gas outlet mouth (22), a return mouth (23) fluidically connectable with said crankcase (550), wherein the assembly body (2) comprises a gas filtration chamber (203) and a water separation chamber (204); a filter group (3) housed in said gas filtration chamber (203) suitable for separating the gases from oil and / or water; a water separation group (4) housed in said water separation chamber (204), comprising a water separation device (40) crossable by the fluid being filtered and suitable for separating the oil from the water to drain oil towards the crankcase (550).

Description

DESCRIPTION"BLOW-BY GAS FILTRATION ASSEMBLY"Field of application

[0001] The present invention concerns a blow-by gas filtration assembly for a crankcase of a hydrogen-powered internal combustion engine of a vehicle. Furthermore, the present invention concerns a ventilation system comprising said blow-by gas filtration assembly.

[0002] In other words, the present invention is placed in the automotive context.

[0003] In particular, the present invention finds application in hydrogen-powered vehicles, and in particular in vehicles in which hydrogen is used as fuel to control the operation of an internal combustion engine of the vehicle.

[0004] In particular, the ventilation system is fluidically connectable to the crankcase of a hydrogen- powered internal combustion engine so as to draw the blow-by gases (from said crankcase) and filter them from the suspended particles contained therein.

[0005] Specifically, by "blow-by gases" it is meant the oil vapours vented from the crankcase of an internal combustion engine during its operation. In particular, said blow-by gases have a composition similar to that of the (exhausted) exhaust gases and are generated by thecombustion of the air / fuel mixture in the combustion chamber. These gases, instead of reaching the exhaust of the exhaust gases of the vehicle, leak into the lower portion of the crankcase passing alongside the cylinders, carrying with them oil droplets. In addition, in light of the fact that said engines are hydrogen-powered, in the respective blow-by gases there are also droplets of water, i.e. water vapour.

[0006] In the present discussion, for simplicity, the blow-by gases are considered to consist of air and suspended particles, wherein said suspended particles comprise oil droplets and water droplets.Prior art

[0007] In the prior art, solutions of filtration assemblies are known, fluidically connectable to the crankcase and suitable for ventilating it, i.e. venting it, from the blow-by gases.

[0008] Specifically, solutions of blow-by gas filtration assemblies are known, which separate from the blow-by gases said undesired suspended particles, comprising a filter group having such purpose.

[0009] In the prior art, multiple embodiments of ventilation systems are known, suitable for ventilating crankcases of an internal combustion engine powered by petrol and / or diesel.

[0010] Differently from such solutions, the ventilation of the crankcase of a hydrogen-powered internal combustion engine presents different issues and complexities.

[0011] Specifically, in fact, hydrogen supply produces high quantities of water vapour that circulate in the ventilation system, i.e. in its components and / or in its ducts.

[0012] A problem encountered in such known solutions is linked to the fact that hydrogen combustion generates high quantities of water vapour. For this reason, it is necessary to ventilate more frequently and with higher flow rates the crankcase of a hydrogen-powered internal combustion engine as compared with the crankcase of a diesel-powered internal combustion engine, in order to control the internal pressures necessary for the correct operation of the engine.Solution of the invention

[0013] In the above-mentioned prior art, there is therefore a strongly felt need to have a blow-by gas filtration assembly for a crankcase of a hydrogen-powered internal combustion engine that solves said problems. In particular, said filtration assembly must at the same time manage the circulation of water vapour inside it.

[0014] The purpose of the present invention is to provide a new embodiment of blow-by gas filtration assembly suitable for effectively managing the presence of water.

[0015] Said purpose is achieved by means of the blowby gas filtration assembly claimed in claim 1. Furthermore, said purpose is achieved by means of the ventilation system in accordance with claim 18.

[0016] The dependent claims show preferred variants of embodiment involving further advantageous aspects. Description of the drawings

[0017] Further features and advantages of the invention will appear from the description reported below of its preferred embodiments, given purely by way of nonlimiting example, with reference to the accompanying figures in which:

[0018] - Figure 1 shows a schematic sectional view of a blow-by gas filtration assembly in accordance with a first embodiment, according to the present invention;

[0019] - Figures 2a and 2b respectively show a schematic view of a ventilation system, connected to the crankcase of a hydrogen-powered internal combustion engine, comprising a blow-by gas filtration assembly like that of figure 1;

[0020] - Figure 3 shows a schematic sectional view of a blow-by gas filtration assembly in accordance with a second embodiment, according to the present invention;

[0021] - Figures 4a and 4b respectively show a schematic view of a ventilation system, connected to the crankcase of a hydrogen-powered internal combustion engine, comprising a blow-by gas filtration assembly like that of figure 3.Detailed description

[0022] With reference to the accompanying figures, reference number 1 denotes a blow-by gas filtration assembly is denoted, in accordance with the present invention.

[0023] With reference to the accompanying figures, reference number 800 denotes a ventilation system, which comprises the blow-by gas filtration assembly 1, in accordance with the present invention.

[0024] Said system 800 is in fact suitable for being connectable to a crankcase 550 of a hydrogen-powered internal combustion engine 500 of a vehicle 900.

[0025] Preferably, the present invention also relates to a vehicle 900 comprising a hydrogen-powered internal combustion engine 500 and said ventilation system 800.

[0026] In particular, the ventilation system 800 is suitable for ventilating, i.e. venting, the crankcase 550 from the blow-by gases.

[0027] Furthermore, the vehicle 900 comprises an engine air suction system 400, for the intake of air towards the combustion chamber of the engine 500. Preferably, said engine air suction system 400 comprises a specific engine air filter for filtering the combustion air.

[0028] Furthermore, the vehicle 900 comprises an engine exhausted gas exhaust system 600, for the outlet of the exhaust gases from the combustion chamber of the engine 500.

[0029] According to a preferred embodiment, the vehicle 900 also comprises a dilution air inlet system 300 configured to allow the intake of ventilation air inside the crankcase 550. Preferably, said dilution air inlet system 300 also comprises a dilution air filter 350. Preferably, said dilution air filter 350 is positioned on a ventilation line communicating with the environment.

[0030] As shown by way of example in the accompanying figures, and as extensively described below, the fluid connections between the distinct components belonging to the ventilation system 800 are made by means of specificducts, which have length, diameter, path or material varying according to the vehicles. Such characteristics of the ducts do not limit the scope of protection of the present invention nor the need to manage the water vapour and the formation of condensation and thus of water. On the contrary, certain lengths, diameters, paths or materials promote the condensation of the water vapour and thus the need to collect and discharge the accumulated water. Preferably, in order to best manage the flows, and in particular the pressure values inside said ducts, specific control valves are also provided.

[0031] In accordance with the present invention, the blow-by gas filtration assembly 1 is suitable for filtering the blow-by gases by performing a filtration / separation action on the particles (liquid, oily or aqueous, and / or solid) suspended in the gas flow.

[0032] Preferably, the ventilation system 800 comprises an operating machine 100 suitable for ventilating the crankcase 550, being configured to convey the blow-by gases to be filtered from the crankcase 550 towards or through the blow-by gas filtration assembly 1.

[0033] According to a first and a second embodiment of the ventilation system 800, shown by way of example in figures 2a and 2b, the operating machine 100 is positioned fluidically upstream of the blow-by gasfiltration assembly 1. The blow-by gases are therefore pushed and pass through the blow-by gas filtration assembly 1. In accordance with the present invention, the reciprocal position between the operating machine 100 and the filtration assembly 1 does not exclude the presence of further components provided between the two.

[0034] According to a third and a fourth embodiment of the ventilation system 800, shown by way of example in figures 4a and 4b, the operating machine 100 is positioned fluidically downstream of the blow-by gas filtration assembly 1. The blow-by gases are therefore drawn through the blow-by gas filtration assembly 1. In accordance with the present invention, the reciprocal position between the operating machine 100 and the filtration assembly 1 does not exclude the presence of further components provided between the two.

[0035] According to a preferred embodiment, said operating machine 100 is a blower or a side channel extractor fan.

[0036] In accordance with the present invention, the blow-by gas filtration assembly 1 comprises an assembly body 2 comprising a gas-to-be-filtered inlet mouth 21 and at least one filtered-gas outlet mouth 22.

[0037] Furthermore, the assembly body 2 comprises a return mouth 23 fluidically connectable with said crankcase 550.

[0038] According to a preferred embodiment, the assembly body 2 comprises a water discharge mouth 24.

[0039] According to the present invention, the assembly body 2 comprises a gas filtration chamber 203 in fluid communication with the gas-to-be-filtered inlet mouth 21 and with the filtered-gas outlet mouth 22.

[0040] According to the present invention, the assembly body 2 comprises a water separation chamber 204 in fluid communication with the return mouth 23.

[0041] According to the present invention, the assembly body 2 comprises a gas filtration chamber 203 and a water separation chamber 204 in fluid communication .

[0042] Preferably, the gas filtration chamber 203 and the water separation chamber 204 are mutually fluidically connected through at least one fluid passage 25.

[0043] In accordance with the present invention, said assembly body 2 comprises a water collection region 204' suitable for storing the water separated from the oil. Preferably, said water collection region 204' is located in the water separation chamber 204.

[0044] The blow-by gas filtration assembly 1 comprises a filter group 3 housed in said assembly body 2, in particular in the gas filtration chamber 203.

[0045] The filter group 3 defines, by its presence, a dirty side RS in which the blow-by gases to be filtered flow, and a clean side CS in which the filtered blow-by gases flow.

[0046] Preferably, therefore, the filter group 3 is suitable for separating from the gases oil droplets and / or water droplets.

[0047] According to a preferred embodiment, said outlet mouth 22 is fluidically connectable to an engine exhausted gas exhaust system 600 of the hydrogen-powered internal combustion engine 500.

[0048] That is to say, the gases filtered by the filter group 3 are discharged into the environment through said engine exhausted gas exhaust system 600.

[0049] According to a preferred embodiment, the ventilation system 800 comprises a non-return member for gas outlet 180' positioned between the gas outlet mouth 22 and the engine exhausted gas exhaust system 600, so as to prevent the entry of engine exhausted gases into the blow-by gas filtration assembly 1 or into the operating machine 100.

[0050] In accordance with an alternative embodiment, said outlet mouth 22 is fluidically connectable to the engine air suction system 400 of the hydrogen-powered internal combustion engine 500.

[0051] That is to say, the gases filtered by the filter group 3 are recirculated in the engine air intake line comprised in the engine air suction system 400 and thus fluidically return to the combustion chamber.

[0052] According to a preferred embodiment, the ventilation system 800 comprises a control member 180" positioned between the gas outlet mouth 22 and the engine air suction system 400, to control the circulation of filtered blow-by gases towards the engine air suction system 400 and / or to prevent the engine air from entering into the blow-by gas filtration assembly 1 or into the operating machine 100.

[0053] Preferably, in the assembly body 2 an oil and / or water collection region is identified, specifically positioned and shaped. Preferably, said oil and / or water collection region is specifically positioned and shaped on the dirty side RS.

[0054] Preferably, said oil and / or water collection region is positioned in a location in which the collection is favoured by gravitational action.

[0055] Preferably, said oil and / or water collection region is provided in the separation chamber 204. In other words, the dirty side RS is in fluid communication with the separation chamber 204, preferably through the fluid passage 25, and oil and / or water flow from said dirty side RS to said separation chamber 204.

[0056] According to a preferred embodiment, in the embodiments in which the blow-by gas filtration assembly 1 operates in suction, it comprises a non-return member 250 suitable for preventing a possible flow from the water separation chamber 204 to the gas filtration chamber 203. Preferably, said non-return member 250 is positioned at said fluid passage 25.

[0057] Preferably, said non-return member 250 is an umbrella valve.

[0058] According to the present invention, the blow-by gas filtration assembly 1 further comprises a water separation group 4 housed in said water separation chamber 204, comprising a water separation device 40 crossable by the fluid under filtration and suitable for separating the oil from the water.

[0059] Said water separation device 40 defines a first side FS in fluid communication with the gas filtration chamber 203, in particular with the dirty side RS, and asecond side SS in fluid communication with the return mouth 23 to drain oil towards the crankcase 550.

[0060] In other words, through the return mouth 23 the oil returns towards the crankcase 550.

[0061] According to the present invention, said water separation group 4 is positioned in fluid communication with the return mouth 23, in such a way as to be positioned between the filter group 3 and the crankcase 550, suitable for allowing the return of the oil, separated from the water, into the crankcase 550.

[0062] In accordance with a preferred embodiment, the water separation group 4 is positioned fluidically upstream of said return mouth 23.

[0063] Preferably, said separation device 40 has coalescent properties.

[0064] Preferably, said separation device 40 has hydrophobic properties.

[0065] According to a preferred embodiment, the separation device 40 comprises a coalescent filter septum 40' and a hydrophobic separator 40", for example in the form of a mesh.

[0066] In accordance with a preferred embodiment, the assembly body 2 comprises a water discharge control device 45 suitable for commanding the discharge of the water collected in the water collection region 204'.

[0067] In accordance with a preferred embodiment, the assembly body 2 comprises a water discharge control device 45 suitable for commanding the discharge of the water collected from the separation group 4.

[0068] In accordance with a preferred embodiment, the water separation group 4 comprises a water discharge control device 45 suitable for commanding the discharge of the water collected from the separation group 4.

[0069] According to a preferred embodiment, the water discharge control device 45 comprises a water level sensor configured to measure the water level in the water collection region 204' and perform the water discharge action upon reaching and / or exceeding a given water level.

[0070] Preferably, the water discharge control device 45 comprises a specially shaped drainage valve.

[0071] Preferably, the water discharge control device 45 is suitable for commanding the discharge of the collected water towards the crankcase 550.

[0072] Preferably, the water discharge control device 45 is suitable for commanding the discharge of the collected water towards the engine exhausted gas exhaust system 600.

[0073] Preferably, the water discharge control device 45 is suitable for commanding the discharge of thecollected water towards a water storage tank 700 of the vehicle 900.

[0074] Preferably, the water discharge control device 45 comprises temperature sensors or is connected to temperature sensors comprised in the vehicle 900.

[0075] In accordance with an preferred embodiment, the water discharge control device 45 performs the water discharge action towards the crankcase 550 at a predefined temperature of the oil or of the internal combustion engine, corresponding to an operating condition such that the water is returned into the crankcase where it evaporates.

[0076] In accordance with an alternative embodiment, the water discharge control device 45 performs the water discharge action towards the crankcase 550 in an operating condition in which the oil has a temperature equal to or higher than 60°C. That is to say, upon detecting operating conditions of the vehicle 900 and of the internal combustion engine such that the oil has a temperature equal to or higher than 60°C, the water is returned into the crankcase where it evaporates.

[0077] In accordance with a variant embodiment, the water discharge control device 45 performs the water discharge action towards the water storage tank 700 in anoperating condition in which the water accumulated in the water collection region 204' is in liquid form.

[0078] In accordance with a variant embodiment, the water discharge control device 45 performs the water discharge action towards the engine exhausted gas exhaust system 600 in an operating condition of the vehicle and / or of the engine such that the water is discharged into a region of the exhaust system 600 where it evaporates.

[0079] Preferably, the water discharge control device 45 comprises a specially shaped valve suitable for being controllable in a control position in which it directs the water to the desired component.

[0080] Preferably, the water discharge control device 45 comprises a four-way valve, for example rotational, electronically controlled.

[0081] In accordance with a preferred embodiment, the blow-by gas filtration assembly 1 comprises, preferably in the filter group 3, a one-way valve 35 suitable for putting the clean side CS in communication with the dirty side RS, so as to allow the passage of water and / or oil from the clean side CS to the dirty side RS towards the water and / or oil collection region.

[0082] According to a preferred embodiment, the filter group 3 comprises a tubular medium 30 crossable underfiltration by the blow-by gases preferably from the outside to the inside, so that said clean side CS corresponds to an inner cavity of the tubular medium 30.

[0083] According to a preferred embodiment, said tubular medium 30 is of the type comprising a nonwoven fabric of synthetic fibres, preferably a nonwoven fabric of polyester fibres, preferably a nonwoven fabric of polybutylene terephthalate fibres.

[0084] Preferably, said one-way valve 35 is positioned on an end plate 31 of the tubular medium 30, preferably on the end plate distal from the region in which the inner cavity of the tubular medium 30 interfaces with the filtered-gas outlet mouth 22.

[0085] Preferably, said one-way valve 35 is an umbrella valve.

[0086] According to a preferred embodiment, the filter group 3 comprises a plurality of tubular media 30 crossable by the blow-by gases in parallel.

[0087] Preferably, the filter group 3 comprises a plurality of tubular media 30 suitable for defining a respective internal cavity in fluid communication with the filtered-gas outlet mouth 22, wherein the internal cavity of each tubular medium is fluidically connectable to the dirty side RS by means of a respective one-way valve 35.

[0088] In accordance with a preferred embodiment, the water separation group 4 comprises an upper support element 41, preferably an upper plate unit 41'.

[0089] In accordance with a preferred embodiment, the upper support element 41 comprises a tubular member suitable for facilitating the outflow of oil.

[0090] Preferably, said fluid passage 25 is comprised in said upper support element 41 being configured to put in fluid communication said gas filtration chamber 203 with the water separation chamber 204.

[0091] According to a preferred embodiment, the upper support element 41 comprises a passage mouth 41" suitable for putting in communication the second side SS with the return mouth 23.

[0092] Preferably, said upper support element 41 comprises two upper sealing elements 410 suitable for engaging an inner wall of the assembly body 2, preferably in a radial direction, to delimit a passage duct 230 which connects the passage mouth 41" to the return mouth 23.

[0093] In accordance with a preferred embodiment, the assembly body 2 or the upper support element 41 comprises, housed in said fluid passage 25, a non-return member 250 suitable for preventing a possible flow fromthe water separation chamber 204 to the gas filtration chamber 203.

[0094] According to a preferred embodiment, the water separation group 4 comprises a lower support element 42, preferably a lower plate group 42'.

[0095] Preferably, said lower support element 42 comprises a lower sealing element 420 suitable for engaging an inner wall of the assembly body 2, preferably in a radial direction, separating the first side FS from the water collection region 204'.

[0096] Preferably, said water collection region 204' is positioned in a location in which the collection is favoured by gravitational action.

[0097] In accordance with what is described above, according to a preferred embodiment, the operating machine 100 is positioned fluidically upstream of the blow-by gas filtration assembly 1, preferably between the crankcase 550 and the blow-by gas filtration assembly 1, that is between the crankcase 550 and the dirty side RS.

[0098] In accordance with what is described above, according to a preferred embodiment, the operating machine 100 is positioned fluidically downstream of the blow-by gas filtration assembly 1: preferably between the blow-by gas filtration assembly 1 and the engine exhausted gas exhaust system 600, or preferably betweenthe blow-by gas filtration assembly 1 and the engine air suction system 400.

[0099] In accordance with such preferred embodiment, the ventilation system 800 further comprises a water collection tank 150 positioned fluidically downstream of the operating machine 100.[000100] In accordance with a preferred embodiment, said water collection tank 150 is suitable for collecting water, i.e. condensate, also in an operating condition with the operating machine 100 switched off.[000101] Preferably, said water collection tank 150 is in fluid communication with the water separation group . [000102] Also according to such embodiment, the assembly body 2 comprises a pressurised air intake mouth 29 for extracting pressurised air from a point fluidically downstream of the outlet port of an operating machine 100, wherein said pressurised air intake mouth 29 is in fluid communication with the first side FS.[000103] Preferably, said pressurised air intake mouth 29 is in fluid communication with the first side FS downstream of the fluid passage 25.[000104] Preferably, said pressurised air intake mouth29 is in fluid communication with the first side FS downstream of the non-return member 250.[000105] Advantageously, with the filtration assembly 1 positioned upstream of the operating machine 100, the pressurised air intake mouth 29 and the non-return member 250 allow to manage the return of oil towards the crankcase 550 during an operating condition distinct from an operating condition in which the blow-by gases are filtered through the filter group 3.[000106] Innovatively, the blow-by gas filtration assembly and the ventilation system are suitable for fulfilling the above-mentioned purpose of the present invention.[000107] Advantageously, the blow-by gas filtration assembly is suitable for managing the blow-by gases both to discharge them after filtration and to reuse the oil and / or water collected.[000108] Advantageously, the blow-by gas filtration assembly is suitable for separating both the oil and the water, in the form of droplets, contained in the blow-by gases drawn from the crankcase.[000109] Advantageously, the oil can be returned, filtered, to the crankcase.[000110] Advantageously, the blow-by gas filtration assembly is suitable for collecting the water, which, in the form of condensate, is created in the system itself.[000111] Advantageously, the blow-by gas filtration assembly is suitable for managing high quantities of condensate and thus of water, exploiting the variable conditions of the vehicle and thus discharging the water in the most efficient ways.[000112] Advantageously, the filtration assembly allows the return of the oil to the crankcase by means of a circulation duct comprised on a support element of the separation device. Advantageously, the return of the oil towards the crankcase is ensured in the presence of the original separation device.[000113] Advantageously, the filtration assembly allows the drainage of the water into the collection chamber thanks to the presence of a sealing element provided on a support element of the separation device. Advantageously, the storage of the water in the collection chamber is ensured in the presence of the original separation device.[000114] Advantageously, the filtration assembly allows the return of condensate water and / or oil accumulated on the clean side of the filter by means of one or more control valves integrated in the filter group and facing the water separation chamber.[000115] Advantageously, the water can be discharged in different ways depending on the needs and the different operating conditions.[000116] Advantageously, with the engine, and thus the oil, at a given temperature, the water can be returned into the crankcase where it is vaporised.[000117] Advantageously, the water can be discharged together with the exhausted gases of the engine.[000118] Advantageously, the water can be stored, separated from the oil, in dedicated tanks.[000119] Advantageously, the blow-by gas filtration assembly is suitable for collecting the water also in static situations of the vehicle, that is with the operating machine switched off.[000120] It is clear that an expert in the field, in order to meet contingent needs, could make modifications to the invention all contained within the scope of protection as defined by the following claims.List of reference numbers:[000121]1 blow-by gas filtration assembly2 assembly body201 first half-body202 second half-body203 gas filtration chamber204 water separation chamber204' water collection region21 gas-to-be-filtered inlet mouth22 filtered-gas outlet mouth23 return mouth24 water discharge mouth25 fluid passage250 non-return member29 pressurised air intake mouth290 air non-return member3 filter group31 end plate35 one-way valve4 water separation group40 separation device40' coalescent filter septum40" hydrophobic separator41 upper support element41' upper plate unit41" passage mouth410 upper sealing element42 lower support element42' lower plate group420 lower sealing element45 water discharge control device100 operating machine150 water collection tank180' non-return member for gas outlet180" control member 300 dilution air inlet system350 dilution air filter400 engine air suction system500 hydrogen-powered internal combustion engine550 crankcase 600 engine exhausted gas exhaust system700 water storage tank800 ventilation system900 vehicleCS clean side RS dirty sideFS first sideSS second side

Claims

CLAIMS1. A blow-by gas filtration assembly (1) for a ventilation system (800) of a crankcase (550) of a hydrogen-powered, internal combustion engine (500) of a vehicle (900), comprising:- an assembly body (2) comprising a gas-to-be-filtered inlet mouth (21) and a filtered-gas outlet mouth (22), a return mouth (23) fluidically connectable to said crankcase (550), wherein the assembly body (2) comprises a gas filtration chamber (203) in fluid communication with the gas-to-be-filtered inlet mouth (21) and the filtered-gas outlet mouth (22), and a water separation chamber (204) in fluid communication with the return mouth (23) and the gas filtration chamber (203), preferably through at least one fluid passage (25);- a filter group (3) housed in said gas filtration chamber (203) suitable for separating gases from oil and / or water defining a dirty side (RS) in which blow-by gases to be filtered flow and a clean side (CS) in which filtered blow-by gases flow;- a water separation group (4) housed in said water separation chamber (204), comprising a water separation device (40) crossable by the fluid being filtered and suitable for separating oil from water defining a first side (FS) in fluid communication with the gas filtrationchamber (203) and a second side (SS) in fluid communication with the return mouth (23) to drain oil towards the crankcase (550); wherein said assembly body (2) comprises a water collection region (204') suitable for storing water separated from the oil.

2. Blow-by gas filtration assembly (1) according to claim 1, wherein said assembly body (2) comprises a water discharge mouth (24) in fluid communication with the water collection region (204') through which water is discharged, wherein preferably said water discharge mouth (24) is positioned at the bottom by the assembly body (2).

3. Blow-by gas filtration assembly (1) according to claim 1 or claim 2, wherein the assembly body (2), preferably the water separation group (4), comprises a water discharge control device (45) suitable for commanding the discharge of water collected from the water separation group (4), preferably through said water discharge mouth (24).

4. Blow-by gas filtration assembly (1) according to claim 3, wherein the water discharge control device (45) comprises a water level sensor configured to measure the water level in the water collection region (204') and perform the water discharge action upon reaching and / orexceeding a given water level.

5. Blow-by gas filtration assembly (1) according to claim 3 or claim 4, wherein the water discharge control device (45) is suitable for controlling the discharge of water to the crankcase (550), or to an engine exhausted gas exhaust system (600), or to a water storage tank (700) of the vehicle (900), for example as a function of the temperature of the oil and / or the crankcase (550).

6. Blow-by gas filtration assembly (1) according to any one of the preceding claims, wherein the water separation device (40) comprises a coalescent filter septum (40') and / or a hydrophobic separator (40").

7. Blow-by gas filtration assembly (1) according to any one of the preceding claims, comprising, preferably in the filter group (3), a one-way valve (35) suitable for putting the clean side (CS) in communication with the dirty side (RS) to allow water and / or oil to return from the clean side (CS) to the dirty side (RS).

8. Blow-by gas filtration assembly (1) according to any one of the preceding claims, wherein the filter group (3) comprises a tubular medium (30) crossable during filtration by the blow-by gases from the outside to the inside, so that the inner cavity of the tubular medium (30) corresponds to said clean side (CS).

9. Blow-by gas filtration assembly (1) according to claim8, comprising a plurality of tubular media (30) crossable by the blow-by gases in parallel.

10. Blow-by gas filtration assembly (1) according to any one of the preceding claims, wherein the water separation group (4) comprises an upper support element (41), preferably an upper plate unit (41').

11. Blow-by gas filtration assembly (1) according to claim 10, wherein said fluid passage (25) is enclosed in said upper support element (41) being configured to put said gas filtration chamber (203) in fluid communication with the water separation chamber (204).

12. Blow-by gas filtration assembly (1) according to claim 10 or claim 11, wherein the upper support element (41) comprises a passage mouth (41") suitable for putting the second side (SS) in communication with the return mouth (23).

13. Blow-by gas filtration assembly (1) according to claim 12, wherein said upper support element (41) comprises two upper sealing elements (410) suitable for engaging an inner wall of the assembly body (2), preferably in a radial direction, to delimit a passage duct (230) which connects the passage mouth (41") to the return mouth (23).

14. Blow-by gas filtration assembly (1) according to any one of the preceding claims, wherein the assembly body(2) or the upper support element (41) comprises a nonreturn member (250) housed in said fluid passage (25), suitable for preventing a possible flow from the water separation chamber (204) to the gas filtration chamber (203).

15. Blow-by gas filtration assembly (1) according to any one of the preceding claims, wherein the water separation group (4) comprises a lower support element (42), preferably a lower plate group (42').

16. Blow-by gas filtration assembly (1) according to claim 15, wherein said lower support element (42) comprises a lower sealing element (420) suitable for engaging an inner wall of the assembly body (2), preferably in a radial direction, separating the first side (FS) from the water collection region (204').

17. Blow-by gas filtration assembly (1) according to any one of the preceding claims, wherein the assembly body (2) comprises a pressurised air intake mouth (29) to extract pressurized air from a point fluidically downstream of the outlet port of an operating machine (100), wherein said pressurised air intake mouth (29) is in fluid communication with the first side (FS).

18. A ventilation system (800) of a crankcase (550) of a hydrogen-powered, internal combustion engine (500) of a vehicle (900) comprising:a blow-by gas filtration assembly (1) according to any one of the preceding claims;- an operating machine (100) suitable for drawing blow-by gases to be filtered from the crankcase (550) towards or through the blow-by gas filtration assembly (1).

19. Ventilation system (800) according to claim 18, wherein said filtered-gas outlet mouth (22) is in fluid communication with an engine exhausted gas exhaust system (600) of the hydrogen-powered, internal combustion engine (500) or wherein said filtered-gas outlet mouth (22) is in fluid communication with the engine air suction system (400) of the hydrogen-powered, internal combustion engine (500).

20. Ventilation system (800) according to claim 18 or claim 19, wherein the operating machine (100) is positioned fluidically upstream of the blow-by gas filtration assembly (1), preferably between the crankcase (550) and the blow-by gas filtration assembly (1).

21. Ventilation system (800) according to claim 18 or claim 19 and in combination with claim 17, wherein the operating machine (100) is positioned fluidically downstream of the blow-by gas filtration assembly (1), preferably between the blow-by gas filtration assembly (1) and an engine exhausted gas exhaust system (600) or preferably between the blow-by gas filtration assembly(1) and the engine air suction system (400).

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