Ventilation system

Abstract

The invention is a ventilation system (1) for a crankcase (550) of a hydrogen-powered internal combustion engine (500) of a vehicle (900), comprising: a blow-by gas filtration assembly (2) comprising an assembly body (20), and a filter group (25) housed in said assembly body (20) defining a dirty side (RS) and a clean side (CS), wherein said filter group (25) separates gases from oil and / or water comprising, preferably in said dirty side (RS), an oil and / or water collection region (210 ); an operating machine (3) 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 (2). The ventilation system (1) comprises a return mouth (203), fluidically connected with said collection region (210), wherein said return mouth (203) is in fluid communication with the crankcase (550), to allow the return of the oil to the crankcase (550). The ventilation system (1) further comprises a water separation group (4) suitable for separating oil from water, fluidically connected with the return mouth (203), positioned between the filter group (25) and the crankcase (550), wherein the water separation group (4) is suitable for allowing the separated oil to return into the crankcase (550).

Description

VENTILATION SYSTEMDESCRIPTIONField of application

[0001] The present invention relates to a ventilation system for a crankcase of a hydrogen-powered internal combustion engine of a vehicle. Moreover, the present invention relates to a method of ventilating a crankcase of a hydrogen-powered internal combustion engine comprising said system.

[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 to draw blow-by gases (from said crankcase) and filter them from suspended particles contained therein.

[0005] Specifically, by "blow-by gases" it is meant the 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(exhausted) exhaust gases and are generated by the combustion of the air / fuel mixture in the combustion chamber. These gases, instead of reaching the exhausted exhaust system of the vehicle, leak into the lower portion of the crankcase passing alongside the cylinders and carrying with them oil droplets. In addition, in light of the fact that said engines are hydrogen-powered, droplets of water, i.e. water vapour, are also found in the respective blow-by gases.

[0006] In the present discussion, for simplicity, 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 fluidically connectable to the crankcase and suitable for ventilating it, i.e. venting it, from blowby gases are known.

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

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

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

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

[0012] A verified problem of such known solutions is linked to the fact that hydrogen combustion generates large 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 compared to the crankcase of a diesel- powered internal combustion engine, in order to control the internal pressures necessary for the correct functioning of the engine. Solution of the invention

[0013] In said prior art, there is therefore a strong need to have a ventilation system for a crankcase of a hydrogen-powered internal combustion engine that solves such issues. In particular, said ventilation system mustat 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 a ventilation system suitable for effectively managing the presence of water inside it.

[0015] Said purpose is achieved by means of the ventilation system claimed in claim 1. Moreover, said purpose is achieved by means of the method of ventilating a crankcase of a hydrogen-powered internal combustion engine by means of said ventilation system according to claim 17.

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

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

[0018] - Figure 1 illustrates a schematic view of a ventilation system, according to the present invention, in accordance with a first embodiment, connected to the crankcase of a hydrogen-powered internal combustion engine;

[0019] - Figure 2 illustrates a schematic view of a ventilation system, according to the present invention, in accordance with a second embodiment, connected to the crankcase of a hydrogen-powered internal combustion engine;

[0020] - Figure 3 shows a schematic sectional view of a blow-by gas filtration assembly comprised in a ventilation system like the one shown in figure 1 or in figure 2;

[0021] - Figure 4 illustrates a schematic view of a ventilation system, according to the present invention, in accordance with a third embodiment, connected to the crankcase of a hydrogen-powered internal combustion engine;

[0022] - Figure 5 illustrates a schematic view of a ventilation system, according to the present invention, in accordance with a fourth embodiment, connected to the crankcase of a hydrogen-powered internal combustion engine;

[0023] - Figure 6 shows a schematic sectional view of a blow-by gas filtration assembly comprised in a ventilation system like the one shown in figure 4 or in figure 5.Detailed description

[0024] With reference to the accompanying figures reference number 1 denotes a ventilation system in accordance with the present invention.

[0025] Said system 1 is in fact suitable for being connectable to a crankcase 550 of a hydrogen-powered internal combustion engine 500 of a vehicle 900.

[0026] Preferably, the subject of the present invention is also a vehicle 900 comprising said ventilation system 1.

[0027] In particular, the ventilation system 1 is suitable for ventilating, i.e. venting, the crankcase 550 from blow-by gases.

[0028] Moreover, the vehicle 900 comprises an engine air suction system 400, for the intake of air towards the combustion chamber of the combustion engine 500. Preferably, said engine air suction system 400 comprises a specific engine air filter 350 for filtering the combustion air.

[0029] Moreover, the vehicle 900 comprises an engine exhausted exhaust system 600, for exhausting exhausted gases from the combustion chamber of the engine 500.

[0030] According to a preferred embodiment, the vehicle 900 further comprises a dilution air intake system 300 to allow the intake of ventilation air inside the crankcase 550. Preferably, said dilution air intakesystem 300 also comprises a dilution air filter 350.Preferably, said dilution air filter 350 is positioned on a ventilation line communicating with the environment.

[0031] As shown by way of example in the accompanying figures, and extensively described below, the fluid connections between the distinct components belonging to the ventilation system 1 are made by means of specific ducts, 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 therefore of water. Indeed, certain lengths, diameters, paths or materials favour the condensation of water vapour and therefore the need to collect and discharge the accumulated water. Preferably, in order to best manage the flows, and in particular the values of the pressures inside said ducts, specific control valves are also provided.

[0032] In accordance with the present invention, the ventilation system 1 is suitable for filtering the blowby gases by carrying out a filtration / separation action on the particles (liquid, oily or aqueous, and / or solid) suspended in the gas stream.

[0033] According to the present invention, the ventilation system 1 comprises a blow-by gas filtrationassembly 2 having the purpose of filtering the blow-by gases that reach it.

[0034] Moreover, according to the present invention, the ventilation system 1 comprises an operating machine 3 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 2.

[0035] According to a first and a second embodiment of the ventilation system 1, shown by way of example in figures 1 and 2, the operating machine 3 is positioned fluidically upstream of the blow-by gas filtration assembly 2. The blow-by gases are therefore pushed and pass through the blow-by gas filtration assembly 2.

[0036] According to a third and a fourth embodiment of the ventilation system 1, shown by way of example in figures 4 and 5, the operating machine 3 is positioned fluidically downstream of the blow-by gas filtration assembly 2. The blow-by gases are therefore drawn through the blow-by gas filtration assembly 2.

[0037] According to a preferred embodiment, the operating machine 3 is a blower or a side channel extractor fan.

[0038] In accordance with the present invention, the filtration assembly 2 comprises an assembly body 20comprising a gas-to-be-filtered inlet mouth 201 and a filtered-gas outlet mouth 202.

[0039] The filtration assembly 2 comprises at least one filter group 25 housed in said assembly body 20 defining a dirty side RS in which blow-by gases to be filtered flow and a clean side CS in which filtered blowby gases flow.

[0040] The filter group 25 separates gases from oil and / or water, comprising, preferably in said dirty side RS, a collection region 210. Preferably, therefore, the filter group 25 is suitable for separating from the gases the oil droplets and / or water droplets.

[0041] Preferably, in the assembly body 20 an oil and / or water collection region 210 is identified, specifically positioned and shaped.

[0042] Preferably, said oil and / or water collection region 210 is positioned in a location in which collection is favoured by gravitational action.

[0043] In accordance with the present invention, moreover, the ventilation system 1 comprises a return mouth 203, fluidically connected with the collection region 210 in which a quantity of oil and / or water is collected, wherein said return mouth 203 is in fluid communication with the crankcase 550, to allow the return of the oil to the crankcase 550.

[0044] Through said return mouth 203, the collected oil is in fact returned to the crankcase.

[0045] In accordance with a preferred embodiment, said return mouth 203 is comprised in the blow-by gas filtration assembly 2, preferably in the assembly body 20.

[0046] Moreover, according to the present invention, the ventilation system 1 comprises a water separation group 4, suitable for separating oil from water.

[0047] According to the present invention, said water separation group 4 is positioned fluidically connected with the return mouth 203. Preferably, said water separation group 4 is indeed suitable for separating water from oil so as to allow the return of the oil towards the crankcase 550 and so as to manage the quantity of water. Said water separation group 4 is positioned between the at least one filter group 25 and the crankcase 550.

[0048] According to a preferred embodiment, the water separation group 4 is positioned fluidically upstream of said return mouth 203.

[0049] In accordance with a preferred embodiment, said return mouth 203 is comprised in the water separation group 4. In accordance with said preferred embodiment,the return mouth 203 corresponds to the outlet port of the water separation group 4.

[0050] According to a further preferred embodiment, the water separation group 4 is positioned fluidically downstream of said return mouth 203.

[0051] Preferably, the water separation group 4 comprises at least one separation device 40 crossable by the fluid under filtration, preferably crossable by oil and not by water. In other words, fluidically downstream of the separation device 40 towards the crankcase 550, the circulation of the oil separated from the water takes place.

[0052] Preferably, said separation device 40 has coalescing properties.

[0053] Preferably, said separation device 40 has hydrophobic properties.

[0054] According to a preferred embodiment, the separation device 40 comprises a coalescing filtering septum 40' and a hydrophobic separator 40", for example in the form of a mesh.

[0055] According to a preferred embodiment, said outlet mouth 202 is in fluid communication with an engine exhausted gas exhaust system 600 of the hydrogen-powered internal combustion engine 500.

[0056] That is to say, the gases filtered by the filter group 25 are exhausted into the environment through said engine exhausted gas exhaust system 600.

[0057] According to a preferred embodiment, the ventilation system 1 comprises a gas outlet non-return member 90' positioned between the filtered-gas outlet mouth 202 and the engine exhausted gas exhaust system 600 to prevent exhaust gases from entering into the blow-by gas filtration assembly 2 or into the operating machine 3.

[0058] In accordance with an alternative embodiment, said outlet mouth 202 is in fluid communication with an engine air suction system 400 of the hydrogen-powered internal combustion engine 500.

[0059] That is to say, the gases filtered by the filter group 25 are recirculated in the engine air suction line comprised in the engine air suction system 400 and therefore fluidically return into the combustion chamber.

[0060] According to such a preferred embodiment, the ventilation system 1 comprises a control member 90" positioned between the filtered-gas outlet mouth 202 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 prevent the intake ofengine air into the blow-by gas filtration assembly 2 or into the operating machine 3.

[0061] According to such a preferred embodiment, said control member 90" is a crankcase 550 pressure control valve (PCV valve).

[0062] In accordance with a preferred embodiment, the ventilation system 1 comprises a water discharge control group 5 suitable for controlling the discharge of water collected from the water separation group 4.

[0063] Preferably, the water discharge control group 5 is suitable for controlling the discharge of the collected water towards the crankcase 550.

[0064] Preferably, the water discharge control group 5 is suitable for controlling the discharge of the collected water towards the engine exhausted gas exhaust system 600.

[0065] Preferably, the water discharge control group 5 is suitable for controlling the discharge of the collected water towards a water storage tank 700 of the vehicle 900.

[0066] Preferably, the ventilation system 1 comprises temperature sensors or is connected to temperature sensors comprised in the vehicle 900.

[0067] Preferably, the water discharge control device45 comprises a temperature sensor or is connected to temperature sensors comprised in the vehicle 900.

[0068] According to a preferred embodiment, the water discharge control group 5 comprises a water level sensor configured to measure the level of water collected in the water separation group 4 and to perform the water discharge action upon reaching and / or exceeding a given level.

[0069] In accordance with an alternative embodiment, the water discharge control group 5 performs the action of discharging water towards the crankcase 550, in an operating situation in which the oil has a temperature equal to or greater than 60°C. That is to say, by detecting operating conditions of the vehicle 900, and / or of the internal combustion engine 500, such that the oil has a temperature equal to or greater than 60°C, the water is sent back into the crankcase 550 where it evaporates.

[0070] In accordance with an alternative embodiment, the water discharge control group 5 performs the action of discharging water towards the water storage tank 700 in an operating situation in which the accumulated water is in liquid form.

[0071] In accordance with an alternative embodiment, the water discharge control group 5 performs the action of discharging water towards the engine exhausted gas exhaust system 600 in an operating situation of the vehicle and / or of the engine such that the water is discharged into a region of the exhausted gas exhaust system 600 where it evaporates.

[0072] Preferably, the water discharge control group 5 comprises a valve specifically shaped to be operable in a control position in which it directs the water to the desired component.

[0073] Preferably, the water discharge control group 5 comprises a four-way valve, for example rotary, electronically controlled.

[0074] According to a preferred embodiment, the water separation group 4 is housed in the assembly body 20. Preferably, the water separation group 4 is integrated into the assembly body 20.

[0075] According to a preferred embodiment, the water discharge control group 5 is housed in the water separation group 4 . Preferably, the water discharge control group 5 is integrated into the water separation group 4.

[0076] According to a preferred embodiment, the water discharge control group 5 is positioned fluidically downstream of the water separation group 4.

[0077] According to a preferred embodiment, the water separation group 4 comprises a water discharge mouth 204 through which the water collected following the separation operation of the water separation device 40 is discharged .

[0078] Preferably, said water discharge control group 5 is fluidically connected with said water discharge mouth 204.

[0079] In accordance with a preferred embodiment, the blow-by gas filtration assembly 2 comprises, preferably in the filter group 25, a one-way valve 255 suitable for putting the clean side CS in communication with the dirty side RS to allow the passage of water and / or oil from the clean side CS towards the collection region 210 and / or the water separation group 4.

[0080] According to a preferred embodiment, the filter group 25 comprises a tubular medium 250 crossable under filtration by the blow-by gases preferably from the outside to the inside, so that the inner cavity of the tubular medium 250 is in fluid communication with said outlet mouth 202. That is to say, at least a part of saidclean side CS corresponds with said inner cavity of the tubular medium 250.

[0081] Preferably, said one-way valve 255 is positioned on an end plate 251 of the filter group 25.

[0082] Preferably, said one-way valve 255 is an umbrella valve.

[0083] According to a preferred embodiment, the blowby gas filtration assembly 2 comprises a plurality of tubular media 250 crossable by the blow-by gases in parallel.

[0084] Preferably, each tubular medium 250 comprises a one-way valve 255.

[0085] According to a preferred embodiment, said tubular media 250 are 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.

[0086] In accordance with what is described above, according to a preferred embodiment, the operating machine 3 is positioned fluidically upstream of the blowby gas filtration assembly 2, preferably between the crankcase 550 and the blow-by gas filtration assembly 2, that is between the crankcase 550 and the dirty side RS. In accordance with the present invention, the mutual position between the operating machine 3 and the assemblybody 20 does not exclude the presence of further components provided between the two.

[0087] In accordance with what is described above, according to a preferred embodiment, the operating machine 3 is positioned fluidically downstream of the blow-by gas filtration assembly 2, preferably between the blow-by gas filtration assembly 2 and the engine exhausted gas exhaust system 600, or preferably between the blow-by gas filtration assembly 2 and the engine air suction system 400. In accordance with the present invention, the mutual position between the operating machine 3 and the assembly body 20 does not exclude the presence of further components provided between the two.

[0088] According to such a preferred embodiment, the ventilation system 1 further comprises an auxiliary water collection volume 6 positioned fluidically downstream of the operating machine 3.

[0089] In accordance with a preferred embodiment, said auxiliary water collection volume 6 is suitable for collecting water, i.e. condensate, even in an operating situation with the operating machine 3 switched off.

[0090] Preferably, said auxiliary water collection volume 6 is in fluid communication with the water separation group .

[0091] Preferably, said auxiliary water collection volume 6 is in fluid communication with the oil and / or water collection region 210.

[0092] In accordance with a preferred embodiment, the auxiliary water collection volume 6 is integrated into the blow-by gas filtration assembly 2, in particular it is obtained in the assembly body 20.

[0093] According to a preferred embodiment, in the embodiments in which the blow-by gas filtration assembly 2 operates in suction, it comprises a non-return member 26 suitable for preventing a possible flow from the water separation chamber 204 to the gas filtration chamber 200

[0094] Preferably, said non-return member 26 is an umbrella valve.

[0095] The subject of the present invention is also a method of ventilating a crankcase 550 of a hydrogen- powered internal combustion engine 500 of a vehicle 900 by means of a ventilation system 1 as described.

[0096] Said ventilation method comprises the steps of:- drawing, by an operating machine 3, the blow-by gases from the crankcase 550;- filtering, by a blow-by gas filtration assembly 2, the blow-by gases by collecting oil and / or water in an oil and / or water collection region 210;separating, by a water separation group 4, water from oil;- returning the oil to the crankcase 550.

[0097] According to a preferred embodiment, the ventilation method comprises the step of:- controlling, by a water discharge control group 5, the discharge of the collected water upon reaching and / or exceeding a given water level.

[0098] According to a further preferred embodiment, the ventilation method comprises the step of:- controlling, by a water discharge control group 5, the discharge of the collected water towards the crankcase 550, in an operating situation in which the oil has a temperature equal to or greater than 60°C.

[0099] According to a further preferred embodiment, the ventilation method comprises the step of:- controlling, by a water discharge control group 5, the discharge of the collected water towards the engine exhausted gas exhaust system 600, in an operating situation of the vehicle and / or of the engine such that the water is discharged into a region of the exhausted gas exhaust system 600 where it evaporates.[000100] Innovatively, the ventilation system for a crankcase of a hydrogen-powered internal combustion engine and the ventilation method by means of saidventilation system are suitable for achieving the abovementioned purpose of the present invention.[000101] Advantageously, the ventilation system is suitable for managing the blow-by gases both for exhausting them after filtration and for reusing the collected oil and / or water.[000102] Advantageously, the ventilation system is suitable for collecting both oil and water, in the form of droplets, contained in the blow-by gases drawn from the crankcase.[000103] Advantageously, the oil can be returned, filtered, into the crankcase.[000104] Advantageously, the ventilation system is suitable for collecting the water, which, in the form of condensate, is created in the ventilation system itself, protecting the components comprised in the system.[000105] Advantageously, the ventilation system is suitable for managing large quantities of condensate and therefore of water, exploiting the variable conditions of the vehicle and therefore discharging the water according to the most efficient mode. Advantageously, the water can be discharged in different ways according to requirements and different operating conditions.[000106] Advantageously, with the engine, and therefore the oil, at temperature, the water can be returned to the crankcase where it is vaporised.[000107] Advantageously, the water can be discharged in the form of vapour together with the engine exhaust gases.[000108] Advantageously, the water can be stored, separated from the oil, in dedicated tanks.[000109] Advantageously, the ventilation system is suitable for collecting water even in static situations of the vehicle, that is with the operating machine switched off.It is clear that a skilled person in the art, 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:[000110]1 ventilation system2 blow-by gas filtration assembly20 assembly body200 gas filtration chamber201 gas inlet mouth202 gas outlet mouth203 return mouth204 water discharge mouth210 collection region25 filter group250 tubular medium251 end plate255 one-way valve26 non-return member3 operating machine4 water separation group40 separation device40' filtering septum40" hydrophobic separator5 water discharge control group6 auxiliary water collection volume90' gas outlet non-return member90" control member300 dilution air intake system350 dilution air filter400 engine air suction system500 hydrogen-powered internal combustion engine550 crankcase600 engine exhausted gas exhaust system700 water storage tank900 vehicleCS clean sideRS dirty side

Claims

CLAIMS1. A ventilation system (1) for a crankcase (550) of a hydrogen-powered, internal combustion engine (500) of a vehicle (900), comprising:- a blow-by gas filtration assembly (2) comprising an assembly body (20) comprising a gas-to-be-filtered inlet mouth (201) and a filtered-gas outlet mouth (202), and a filter group (25) housed in said assembly body (20) 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, wherein said filter group (25) separates gases from oil and / or water comprising, preferably in said dirty side (RS), an oil and / or water collection region (210);- an operating machine (3) suitable for ventilating the crankcase (550) being configured to convey blow-by gases to be filtered from the crankcase (550) towards or through the blow-by gas filtration assembly (2); wherein the ventilation system (1), preferably the blowby gas filtration assembly (2), comprises a return mouth (203), fluidically connected to said collection region (210), wherein said return mouth (203) is in fluid communication with the crankcase (550), to allow oil to return to the crankcase (550) wherein the ventilation system (1) comprises:a water separation group (4) suitable for separating oil from water, fluidically connected to the return mouth (203), positioned between the filter group (25) and the crankcase (550), wherein the water separation group (4) is suitable for allowing the separated oil to return into the crankcase (550).

2. Ventilation system (1) according to claim 1, wherein the water separation group (4) is positioned fluidically upstream of said return mouth (203).

3. Ventilation system (1) according to any one of the preceding claims, wherein said filtered-gas outlet mouth (202) is in fluid communication with an engine exhausted gas exhaust system (600) of the vehicle (900) fluidically connected to the hydrogen-powered, internal combustion engine (500).

4. Ventilation system (1) according to claim 1 or claim 2, wherein said filtered-gas outlet mouth (202) is in fluid communication with an engine air suction system (400) of the vehicle (900) fluidically connected to the hydrogen-powered, internal combustion engine (500), in particular being suitable for recirculating filtered blow-by gases downstream of an engine air filter (350).

5. Ventilation system (1) according to any one of claim 3 or claim 4, comprising a gas outlet non-return member (90') positioned between the filtered-gas outlet mouth(202) and the engine exhausted gas exhaust system (600) to prevent engine exhaust gases from entering into the blow-by gas filtration assembly (2) or into the operating machine (3) or comprising a control member (90") positioned between the filtered-gas outlet mouth (202) and the engine air suction system (400), to control the flow of filtered blow-by gases to the engine air suction system (400) and / or prevent engine air from entering into the blow-by gas filtration assembly (2) or into the operating machine (3).

6. Ventilation system (1) according to any one of the preceding claims, comprising a water discharge control group (5) suitable for controlling the discharge of water collected from the water separation group (4) towards the crankcase (550) or towards the engine exhausted gas exhaust system (600) or towards a water storage tank (700) of the vehicle (900).

7. Ventilation system (1) according to claim 6, wherein the water discharge control group (5) comprises a water level sensor configured to measure the level of water collected in the water separation group (4) and perform the water discharge action upon reaching and / or exceeding a given level.

8. Ventilation system (1) according to claim 6 or claim 7, wherein the water discharge control group (5) performsthe action of discharging water towards the crankcase(550), in an operating situation in which oil has a temperature of 60°C or more.

9. Ventilation system (1) according to claim 6 or claim 7, wherein the water discharge control group (5) performs the discharge of the collected water towards the engine exhausted gas exhaust system (600) in an operating situation 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.

10. Ventilation system (1) according to claim 6 or claim 7, wherein the water discharge control group (5) performs the discharge of the collected water towards a water storage tank (700) of the vehicle (900) in an operating situation in which the accumulated water is in liquid form .

11. Ventilation system (1) according to any one of the preceding claims, wherein the blow-by gas filtration assembly (2) comprises, preferably in the filter group (25), a one-way valve (255) suitable for putting the clean side (CS) in communication with the dirty side (RS) to allow the passage of water from the clean side (CS) towards the collection region (210) and / or the water separation group (4).

12. Ventilation system (1) according to any one of thepreceding claims, wherein the filter group (25) comprises a tubular medium (250) crossable under filtration by the blow-by gases from the outside to the inside, so that the inner cavity of the tubular medium (250) is in fluid communication with said filtered-gas outlet mouth (202).

13. Ventilation system (1) according to claim 12, wherein the blow-by gas filtration assembly (2) comprises a plurality of tubular media (250) crossable by the blow-by gases in parallel.

14. Ventilation system (1) according to any one of the preceding claims, wherein the operating machine (3) is positioned fluidically upstream of the blow-by gas filtration assembly (2), preferably between the crankcase (550) and the blow-by gas filtration assembly (2).

15. Ventilation system (1) according to any one of the preceding claims, wherein the operating machine (3) is positioned fluidically downstream of the blow-by gas filtration assembly (2), preferably between the blow-by gas filtration assembly (2) and an engine exhausted gas exhaust system (600), or preferably between the blow-by gas filtration assembly (2) and an engine air suction system (400).

16. Ventilation system (1) according to claim 15, comprising an auxiliary water collection volume (6) positioned fluidically downstream of the operatingmachine (3).

17. Ventilation system (1) according to claim 16, wherein the auxiliary water collection volume (6) is in fluid communication with the water separation group (4).

18. Ventilation system (1) according to claim 17, wherein the auxiliary water collection volume (6) is integrated into the blow-by gas filtration assembly (2).

19. A method of ventilating a crankcase (550) of a hydrogen-powered, internal combustion engine (500) of a vehicle (900) by means of a ventilation system (1) according to any one of the preceding claims, comprising the steps of:- drawing, by an operating machine (3), the blow-by gases from the crankcase (550);- filtering, by a blow-by gas filtration assembly (2), the blow-by gases by collecting oil and / or water in an oil and / or water collection region (210);- separating, by a water separation group (4), water from oil;- returning the oil to the crankcase (550).

20. Ventilation method according to claim 19, in combination with claim 7 or claim 8, comprising the step of:- controlling, by a water discharge control group (5), the discharge of the collected water upon reaching and / orexceeding a given level of water; or- controlling, by a water discharge control group (5), the discharge of the collected water towards the crankcase (550), in an operating situation in which the oil has a temperature equal to or greater than 60°C.

21. Ventilation method according to claim 19, in combination with claim 7 or claim 8, comprising the step of: - controlling, by a water discharge control group (5), the discharge of the collected water towards the engine exhausted gas exhaust system (600), in an operating situation of the vehicle and / or of the engine such that the water is discharged into a region of the engine exhausted gas exhaust system (600) where it evaporates.

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