DESC:TECHNICAL FIELD
[0001] The present subject matter relates generally to a vehicle. More particularly but not exclusively, the present subject matter relates to a fuel vapor collecting device for a vehicle.
BACKGROUND
[0002] The Evaporative Emission Control System is designed to capture and control the fuel vapor that are formed in the fuel system. The Evaporative Emission Control System is crucial for reducing harmful emissions and preventing the release of volatile organic compounds (VOCs) and hydrocarbons into the atmosphere. Further, the Evaporative Emission Control System reduces the wastage of the fuel thereby increasing the fuel efficiency and mileage.
[0003] The key components of the Evaporative Emission Control System are a fuel tank, an evaporated fuel collecting device, connecting tubes, a roll-over valve, an evaporated fuel retaining device, a fuel level sensor, and a fuel pump. The fuel tank is a sealed container, which receives and stores fuel for the vehicle. However, some fuel vapor can still escape through the venting system of the fuel tank, due to variation in temperature and fuel expansion. When the vehicle is not in running condition or the engine is off, the fuel inside the fuel tank can evaporate thereby forming fuel vapor. These fuel vapour rises and are collected by the evaporated fuel collecting device. Further, the fuel vapor is transmitted to the evaporated fuel retaining device, through the connecting tubes, where the fuel vapor is stored temporarily. The purpose of the evaporated fuel retaining device is to prevent the release of harmful fuel vapor into the atmosphere. By capturing and collecting the fuel vapor, the evaporated fuel collecting device plays a critical role in reducing evaporative emissions from the vehicle. The roll-over valve is provided between the fuel tank and the evaporated fuel retaining device in order to prevent any unwanted flooding of the evaporated retaining device due to the roll-over of the vehicle. A typical roll-over valve consists of a valve body, and a float mechanism. The valve body is responsible for controlling the fuel flow, while the float mechanism or rollover ball senses changes in the vehicle's orientation. The roll-over valve is a critical safety device designed to prevent fuel leakage in vehicles, especially vehicles with a higher risk of rolling over or tilting at extreme angles like in two-wheeled vehicles, all-terrain vehicles (ATVs), off-road vehicles, and even some small boats. Without the roll-over valve, the fuel could spill out during rollovers or extreme tilting, leading to a considerable fire hazard. The leaked fuel might come into contact with hot engine components, sparks, or open flames, creating the risk of fire or even an explosion. Further, the leaked fuel might contaminate soil, groundwater, or nearby water bodies, causing environmental pollution and potential harm to ecosystems.
[0004] While the roll-over valve provides essential safety benefits in preventing fuel leakage during rollovers or extreme tilting, there are some potential disadvantages and challenges associated with their mounting in a fuel system. The inclusion of the roll-over valve adds to the overall cost and complexity of the fuel system. The roll-over valve itself, along with the necessary components, can increase manufacturing expenses thereby impacting the market price of the vehicle. Additionally, the mounting of the roll-over valve requires multiple brackets, further increasing the part count, complexity and the cost of the overall fuel system.
[0005] Due to the limited availability of space, especially in two-wheeled vehicles, finding an appropriate location within the fuel tank to mount roll-over valve can be challenging. It is crucial to ensure that the roll-over valve does not interfere with other components or systems. Maintenance of the roll-over valve requires specialized tools and expertise thereby leading to higher service costs. In the event of a malfunction or failure, the reparation or replacement of the roll-over valve becomes a cumbersome and time-consuming process. During the maintenance and servicing of the roll-over valve, excessive disassembly or removal of other components is required. This is due to the difficult access and less clearance of the roll-over valve from the surrounding components.
[0006] In conventional vehicles, the suitability of the roll-over valve varies with the type of fuel used in the vehicle. This is due to the pressure and temperature variations encountered in the fuel system. There is a lack of an Evaporative Emission Control System, which is compatible with the different types of fuel, fuel tank capacity, fuel line connections, and fuel flow requirements. Furthermore, the placement of the roll-over valve fails minimize the damage to the roll-over valve from excessive vibrations, accidental impacts and dislodging during normal vehicle operation. Additionally, the placement of the roll-over valve, in conventional vehicles, fails to provide simple routing of fuel lines, vent hoses and connecting tubes.
[0007] To overcome the above-mentioned problems, the present invention discloses a novel and inventive Evaporative Emission Control System. In the disclosed Evaporative Emission Control System, the evaporated fuel collecting device is modified and delegated with the functions of conventional roll-over valve. The present invention eliminates the need of the roll-over valve, without compromising the functioning of the roll-over valve. Therefore, the overall Evaporative Emission Control System of the fuel system becomes less expensive, and part-count is reduced. Further, the maintenance, servicing, repairing, or replacement becomes easy and less expensive.
[0008] Thus, there is a need for the art of a vehicle, which addresses at least the aforementioned problems.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The details are described with reference to an embodiment of an Evaporative Emission Control System, a fuel tank assembly and an evaporated fuel collecting device for a vehicle. The same numbers are used throughout the drawings to refer similar features and components.
[00010] Figure 1 illustrates a right perspective view of a motor vehicle, in accordance with an embodiment of the present invention.
[00011] Figure 2 illustrates a perspective view of a frame assembly with a fuel tank, in accordance with an embodiment of the present invention.
[00012] Figure 3 illustrates a perspective view of the fuel tank in between the fuel tank inner and fuel tank outer, without the fuel tank outer, in accordance with an embodiment of the present invention.
[00013] Figure 4 illustrates a perspective view of the fuel tank inner, in accordance with an embodiment of the present invention.
[00014] Figure 5a to 5c illustrates a cross-sectional view of a fuel vapour collecting device, in accordance with an embodiment of the present invention.
SUMMARY OF THE INVENTION
[00015] The present subject matter relates to an evaporated fuel collecting device for collecting fuel vapor generated in a fuel tank of a vehicle. The evaporated fuel collecting device comprises a head portion, and a stem portion. The head portion is provided with at least one inlet. The at least one inlet is configured to allow an ingress of the fuel vapor into the head portion. The stem portion is configured to allow the passage of the fuel vapor from the head portion to a connecting duct.
[00016] The present subject matter also relates to an evaporative emission control system for a vehicle. The evaporative emission control system is configured to prevent fuel vapor in a fuel tank from escaping into the atmosphere. The evaporative emission control system comprises an evaporated fuel collecting device, a connecting duct and an evaporated fuel retaining device. The evaporated fuel collecting device is configured to collect fuel vapor from the fuel tank. The evaporated fuel collecting device comprises a head portion, and a stem portion. The head portion is provided with at least one inlet. The at least one inlet is configured to allow an ingress of the fuel vapor into the head portion. The stem portion is configured to align the head portion in an upright orientation. The stem portion is configured to route a passage of the fuel vapor from the head portion to outside of the fuel tank. The connecting duct is connected to the stem portion to enable the passage of the fuel vapor from inside the fuel tank to the outside of the fuel tank. The evaporated fuel retaining device is directly connected to the stem portion through the connecting duct to receive the fuel vapor from the evaporated fuel collecting device. The evaporated fuel retaining device is filled with an adsorbent material. The adsorbent material is adapted to absorb the fuel vapor.
[00017] The present subject matter also relates to a fuel tank assembly for a vehicle. The fuel tank assembly comprises a fuel tank, and an evaporative emission control system. The fuel tank is configured to receive and store fuel. The evaporative emission control system is configured to prevent fuel vapor in the fuel tank from escaping into an atmosphere. The evaporative emission control system comprises an evaporated fuel collecting device, a connecting duct and an evaporated fuel retaining device. The evaporated fuel collecting device is configured to collect fuel vapor from the fuel tank. The evaporated fuel collecting device comprises a head portion, and a stem portion. The head portion is provided with at least one inlet. The at least one inlet is configured to allow an ingress of the fuel vapor into the head portion. The stem portion is configured to align the head portion in an upright orientation. The stem portion is configured to route a passage of the fuel vapor from the head portion to outside the fuel tank. The connecting duct is connected to the stem portion to enable the passage of the fuel vapor from inside the fuel tank to the outside of the fuel tank. The evaporated fuel retaining device is directly connected to the stem portion through the connecting duct to receive the fuel vapor from the evaporated fuel collecting device. The evaporated fuel retaining device is filled with an adsorbent material. The adsorbent material is adapted to adsorb the fuel vapor.

DETAILED DESCRIPTION
[00018] In order to overcome one or more of the above-mentioned challenges, the present invention provides an evaporated fuel collecting device. The disclosed evaporated fuel collecting device is modified in order to perform the functions of conventional roll-over valve apart from collecting a fuel vapor generated in a fuel tank. The present invention successfully eliminates the need of the roll-over valve, without compromising the functioning of the roll-over valve. Further, the need of mounting arrangements for the roll-over valve in vehicle is also eliminated thereby reducing the part-count and overall cost of the fuel system.
[00019] As per one embodiment of the invention, the invention relates to an evaporated fuel collecting device for collecting a fuel vapor generated or emanating from a fuel tank of a vehicle. The evaporated fuel collecting device comprises a head portion, and a stem portion. The head portion is provided with at least one inlet. The at least one inlet is configured to allow an ingress of the fuel vapor into the head portion. The stem portion is configured to align the head portion in an upright orientation. The stem portion is configured to allow the passage of the fuel vapor from the head portion to a connecting duct.
[00020] As per one embodiment of the invention, the head portion is configured to be positioned near an inner surface of a top portion of the fuel tank.
[00021] As per one embodiment of the invention, the head portion includes a primary passage. The primary passage is disposed within the head portion, perpendicular to the stem portion of the evaporated fuel collecting device. The primary passage includes a middle portion and at least one adjacent side portions. The adjacent side portions of the primary passage house at least one spring mechanism. Within the middle portion of the primary passage, there exists at least one inlet hole facilitating the entry of fuel vapor from the tank into the head portion of the evaporated fuel collecting device. Furthermore, the middle portion includes a movable stopper, which can also be called as a rollover ball because of being spherical in shape. The movable stopper is configured for moving freely within the primary passage.
[00022] In an embodiment the primary passage includes three inlet holes. One of the three inlet holes being positioned precisely in the centre of the middle portion, directly above the stem portion. The remaining two inlet holes being positioned on the sides of the primary passage, just before the onset/starting of the side portions. Each inlet hole is configured to match the contour of the stopper, aligning precisely with its shape. This alignment ensures that when the stopper covers an inlet hole, it effectively seals it, preventing the ingress of fuel vapor through that specific inlet hole.
[00023] In another embodiment, the head portion of the evaporated fuel collecting device responds to shifts in the vehicle's angle, thereby performing the function of a conventional roll over valve (ROV).
[00024] In one embodiment, when the vehicle maintains an upright position, the head portion of the evaporated fuel collecting device also remains upright, with the stopper positioned in the centre of the middle portion of the primary passage, effectively blocking the central inlet hole of the primary passage in the head portion. However, while the central inlet hole is blocked, the side inlet holes remain open, allowing fuel vapor to ingress through these apertures. This selective blocking of one inlet hole while permitting fuel vapor entry through the others ensures that only the necessary amount of fuel vapor, suitable for subsequent processing by the fuel vapor retaining device, is collected. By limiting the collection to the required amount, this mechanism optimizes fuel vapor capture efficiency and minimizes wastage, a particularly advantageous feature when the vehicle is in an upright position without any lean angle. Furthermore, this design permits the fuel tank to breathe and vent properly, preventing excessive pressure buildup within the fuel system.
[00025] However, if the vehicle experiences tilting, such as during a rollover or extreme manoeuvring, the stopper moves within the primary path corresponding to the change in the vehicle's angle. As the vehicle tilts beyond a certain threshold, i.e a predetermined angle, for example 45 degrees, both the head portion and stem portion of the evaporated fuel collecting device tilt accordingly. This adjustment positions at least one inlet hole of the head portion near the fuel level of the tank. The movable nature of the stopper allows it to respond to the tilting by shifting towards the inlet hole near the fuel level, effectively blocking it. This action prevents excessive fuel from escaping the tank into the head portion during vehicle tilting, ensuring that no excessive fuel vapor or liquid enters the fuel vapor retaining device through the head portion. By preventing such potential leakage, this mechanism enhances safety and prevents fuel loss or vapor release during vehicle tilting events. The system's responsiveness to changes in vehicle orientation, such as tilting or rollover, demonstrates its adaptability to various driving conditions, ensuring consistent functionality and safety across different scenarios.
[00026] By effectively controlling the ingress of fuel vapor or liquid into the fuel vapor retaining device, the system reduces the risk of potential leaks or spills, thereby enhancing overall safety, especially in situations involving vehicle tilting or rollover.
[00027] The selective collection of fuel vapor ensures that only the required amount is processed, leading to optimized fuel efficiency. This is particularly valuable in maximizing the vehicle’s mileage and reducing fuel consumption.
[00028] By preventing the ingress of excessive fuel vapor or liquid into the fuel vapor retaining device, the system helps prolong the lifespan of critical components, reducing the need for frequent maintenance or replacements.
[00029] Minimizing fuel vapor escape and potential leakage not only conserves fuel but also reduces harmful emissions, contributing to environmental preservation and compliance with emissions regulations.
[00030] Further, proper venting of the fuel tank ensures optimal operation of the vehicle's fuel system, supporting smooth engine performance and overall vehicle functionality.
[00031] Furthermore, the incorporation of the fuel vapor collecting device described herein effectively serves the function of a conventional roll-over valve (ROV), eliminating the necessity for an additional component between the connecting duct and the fuel vapor retaining device. By eliminating this extra component, the requirement for additional mounting brackets is also eradicated. This streamlined design not only simplifies the overall system configuration but also reduces manufacturing complexity and assembly time. Consequently, the fuel vapor collecting device of the present claimed invention offers a cost-effective and efficient solution while enhancing the reliability and performance of the fuel system.
[00032] As per one embodiment of the invention, the connecting duct is configured to allow a direct passage of the fuel vapor from the evaporated fuel collecting device into an evaporated fuel retaining device. The evaporated fuel retaining device is filled with an adsorbent material. The adsorbent material is adapted to adsorb the fuel vapor.
[00033] As per one embodiment of the invention, the evaporated fuel retaining device is provided with an outlet. The outlet is connected to an intake manifold of an engine. The outlet is configured to purge the fuel vapor into the intake manifold of the engine through a fuel intake member.
[00034] As per one embodiment of the invention, the stem portion is connected to an inner surface of a bottom of the fuel tank. The stem is configured to provide a rigid support to the stem portion and is configured to connect the head portion to the connecting duct.
[00035] As per one embodiment of the invention, the connecting duct is made of a plurality of pre-formed layers.
[00036] As per one embodiment of the invention, the stem portion is made one of a rigid and a flexible material.
[00037] The embodiments of the present invention will now be described in detail with reference to an embodiment of an evaporated fuel collecting device, along with the accompanying drawings. However, the disclosed invention is not limited to the present embodiments.
[00038] Figure 1 illustrates a right perspective view of a motor vehicle 10, in accordance with an embodiment of the present invention. Figure 2 illustrates a perspective view of a frame assembly with a fuel tank, in accordance with an embodiment of the present invention. The motor vehicle 10 includes a power unit for providing traction force to the vehicle 10. In a preferred embodiment, the power unit comprises an internal combustion engine 12 that is vertically disposed. Preferably, the internal combustion engine 12 is a single cylinder type internal combustion engine. The vehicle 10 further includes a front wheel 14, a rear wheel 16, a frame assembly 20, a seat assembly 18 and a fuel tank 40. The frame assembly 20 includes a head pipe 22, a main frame 24, a pair of left and right seat rails 24A, 24B, a down tube 25. The head pipe 22 supports a steering shaft (not shown) and two telescopic front forks 26 (only one shown) attached to the steering shaft through a lower bracket (not shown). The two telescopic front forks 26 support the front wheel 14. The upper portion of the front wheel 14 is covered by a front fender 28 mounted to the lower portion of the telescopic front forks 26 at the end of the steering shaft. A head light 32, a visor guard (not shown) and instrument cluster (not shown) are arranged on an upper portion of the head pipe 22. The down tube 25 may be located in front of the internal combustion engine 12 and extends slantly downward from the head pipe 22. The pair of seat rails 24A, 24B are located above the internal combustion engine 12 and extends rearward from the head pipe 22. The internal combustion engine 12 is mounted at the front to the down tube 25 and a rear of the internal combustion engine 12 is mounted at a rear portion of the main frame 24. In an embodiment, the internal combustion engine 12 is mounted vertically, with a cylinder block extending vertically above a crankcase. In an alternative embodiment, the internal combustion engine 12 is mounted horizontally (not shown) with the cylinder block extending horizontally forwardly from the crankcase. In an embodiment, the cylinder block is disposed rearwardly of the down tube 25.
[00039] The pair of left and right seat rails 24A, 24B are joined to the main frame 24 and extend rearward to support the seat assembly 18. A rear swing arm 34 is connected to the frame assembly 20 to swing vertically, and the rear wheel 16 is connected to a rear end of the rear swing arm 34. Generally, the rear swing arm 34 is supported by a rear suspension. A taillight unit 37 is disposed at the end of the vehicle 10 and at the rear of the seat assembly 18. The rear wheel 16 arranged below the seat assembly 18 rotates by the driving force of the internal combustion engine 12 transmitted through a chain drive (not shown) from the internal combustion engine 12. A rear fender 38 is disposed above rear wheel 16 and is configured to cover the rear wheel 16.
[00040] Further, an exhaust pipe (not shown) of the vehicle 10 extends vertically downward from the internal combustion engine 12 up to a point and then extends below the internal combustion engine 12, longitudinally along the vehicle length before terminating in a muffler 36. The muffler 36 is typically disposed adjoining the rear wheel 16.
[00041] The vehicle 10 further includes a handlebar 50 connected to the head pipe 22 of the frame structure and extending in a vehicle width direction. The handlebar 50 can rotate to both sides of the vehicle 10 during vehicle turning movements.
[00042] As depicted in Figure 2, the fuel tank 40 is mounted on the frame assembly 20 of the vehicle 10. In a further embodiment, the fuel tank 40 is configured to be mounted on the main frame 24 of the frame assembly 20. Herein, the fuel tank 40 of the vehicle 10 is mounted on the main frame 24 and the pair of seat rails 24A, 24B. In an embodiment, the front portion of the fuel tank 40 is mounted on the main frame 24 just behind the head pipe 22 of the frame assembly 20. The rear portion of the fuel tank 40 is fastened to the front portion of the pair of seat rails 24A, 24B using a plurality of fasteners. The fuel tank 40 has an external surface, which is elevated than the other surface of the fuel tank 40. The fuel tank 40 comprises of a fuel tank outer 40a and a fuel tank inner 40b.
[00043] Furthermore, in an embodiment, the vehicle 10 comprises a rotary electric machine (not shown). The rotary electric machine is connected to a crankshaft of internal combustion engine 12. In an embodiment, the rotary electric machine is an ACG machine or magneto that is configured to rotate with the crankshaft and convert rotational energy into electric energy to provide electrical power to vehicle components and charge a battery of the motor vehicle 10.
[00044] Figure 3 illustrates a perspective view of the fuel tank 40 in between the fuel tank inner 40b and fuel tank outer 40a, without the fuel tank outer 40a, in accordance with an embodiment of the present invention.
[00045] The motor vehicle 10 has a fuel vapour collecting device 102. The fuel vapour collecting device 102 is disposed inside the fuel tank 40 between fuel tank inner 40b and fuel tank outer 40a. The fuel vapour collecting device 102 is configured to absorb and collect the fuel vapours inside the fuel tank 40 during the extreme tilting of the motor vehicle 10, thereby preventing fuel vapour build up inside the fuel tank 40. In an embodiment, the fuel vapour collecting device 102 collects the fuel vapours from the fuel tank 40 and then the collected fuel vapours flow through a connecting duct 201 and then through connecting duct 201 to the fuel vapour retaining device 202.
[00046] In an embodiment, the fuel tank 40 includes a fuel pump 104 and a fuel sensor 106. In an embodiment, the fuel pump 104 is integrated into the fuel tank 40 to deliver pressurized fuel to the engine 12 for efficient combustion. The fuel pump 104 includes an integrated internal fuel filter, which ensures that the fuel is filtered on first level, before exiting the fuel tank 40. In another embodiment, the fuel sensor 106 measures the fuel level inside the fuel tank 40 and provides feedback to the vehicle’s fuel gauge or fuel monitoring system, allowing a rider to monitor the remaining amount of fuel.
[00047] Figure 5a to 5c illustrates a cross-sectional view of a fuel vapour collecting device, in accordance with an embodiment of the present invention.
[00048] In the present invention, the evaporated fuel collecting device 102 is provided with a mechanism that not only prevents the flooding of the evaporated fuel retaining device 202 with the liquid fuel but also prevents the liquid fuel from entering into the at least one inlet in the very first place. The present invention ensures that only the evaporated fuel vapor is allowed to ingress into the head portion 102a of the evaporated fuel collecting device 102 through the at least one inlet hole (305a, 305b, 305c).
[00049] Further, in the present invention, the roll-over valve is eliminated. Therefore, the connecting duct 201 allows a direct passage of the fuel vapor from the evaporated fuel collecting device 102 into an evaporated fuel retaining device 202. The evaporated fuel retaining device 202 is filled with an adsorbent material. The adsorbent material is adapted to adsorb the fuel vapor.
[00050] The stem portion 102b is provided with a predefined profile. The stem portion 102b is made up of a flexible material, including but not limited to, plastic, polyvinyl chloride (PVC), rubber and braided metals. The stem portion 102b aligns with the head portion 102a in an upright orientation. The stem portion 102b routes a passage of the fuel vapor from the head portion 102a to outside the fuel tank 40. The connecting duct 201 is connected to the stem portion 102b to enable the passage of the fuel vapor from inside the fuel tank 40 to the outside of the fuel tank 40. The evaporated fuel retaining device 202 is directly connected to the stem portion 102b through the connecting duct 201 to receive the fuel vapor from the evaporated fuel collecting device (200). The evaporated fuel retaining device 202 is filled with an adsorbent material, adapted to adsorb the fuel vapor.
[00051] In a preferred embodiment, the evaporated fuel retaining device 202 is a cannister. The canister is a key component of the fuel system of the vehicle. The canister is a container filled with adsorbent material. The adsorbent material includes, but not limited to, activated charcoal and carbon pellets. The adsorbent material, present in canister, adsorbs the fuel vapor captured by the evaporated fuel collecting device 102. The adsorbent material also adsorbs the condensed fuel formed due to cooling of fuel vapor while moving from the evaporated fuel collecting device 102 to the canister.
[00052] The evaporated fuel retaining device 202 is provided with an outlet. The outlet is connected to an intake manifold of an engine. The outlet purges the fuel vapor into the intake manifold of the engine through a fuel intake member. An Engine Control Module (ECM) assesses the engine's suitability to utilize these captured fuel vapor stored within the evaporated fuel retaining device 202. Under specific engine operating conditions, the Engine Control Module issues a command to open the outlet. This enables the vacuum, developed in engine, to extract the stored fuel vapor from the evaporated fuel retaining device 202. The purged fuel vapor is directed into the engine's intake manifold through a fuel intake member. The fuel intake member includes but not limited to a carburettor, a fuel injection assembly and an air filter. Within the intake manifold, the drawn fuel vapor blend with incoming air and are subsequently incinerated within the combustion chambers of the engine, during the standard combustion process. This ensures that the collected fuel vapor is not released into the environment but are instead completely consumed within the engine. By retaining and purging fuel vapor, the canister not only helps to reduce harmful emissions but also ensures that the fuel vapor is effectively recycled.
[00053] As per one embodiment of the invention, the invention relates to an evaporated fuel collecting device 102 for collecting a fuel vapor generated or emanating from a fuel tank 40 of a vehicle 10. The evaporated fuel collecting device 102 comprises a head portion 102a, and a stem portion 102b. The head portion 102a is provided with at least one inlet (305a, 305b, 305c), interchangeably used as inlet hole (305a, 305b, 305c). The at least one inlet hole (305a, 305b, 305c) is configured to allow an ingress of the fuel vapor into the head portion 102a. The stem portion 102b is configured to align the head portion 102a in an upright orientation. The stem portion 102b is configured to allow the passage of the fuel vapor from the head portion 102a to a connecting duct 201.
[00054] As per one embodiment of the invention, the head portion 102a is configured to be positioned near an inner surface of a top portion of the fuel tank 40.
[00055] As per one embodiment of the invention, the head portion 102a includes a primary passage 301. The primary passage 301 is disposed within the head portion 102a, perpendicular to the stem portion 102b of the evaporated fuel collecting device102. The primary passage 301 is separate from the body 302 of the head portion 102a. The primary passage 301 includes a middle portion 301a and at least one adjacent side portions (301b, 301c). The adjacent side portions (301b, 301c) of the primary passage 301 houses at least one spring mechanism (304a, 304b). Within the middle portion 301a of the primary passage 301, there exists at least one inlet hole (305a, 305b, 305c) facilitating the entry of fuel vapor from the fuel tank 40 into the head portion 102a of the evaporated fuel collecting device 102. Furthermore, the middle portion 301a includes a movable stopper 303, which can also be called as a rollover ball 303 because of being spherical in shape. The movable stopper 303 is configured for moving freely within the primary passage 301.
[00056] In an embodiment the primary passage 301 includes three inlet holes (305a, 305b, 305c). One of the three inlet holes 305c being positioned precisely in the centre of the middle portion 301a, directly above the stem portion 102b. The remaining two inlet holes (305a, 305b) being positioned on the sides of the primary passage 301, just before the onset/starting of the side portions (301b, 301c). Each inlet hole (305a, 305b, 305c) is configured to match the contour of the stopper 303, aligning precisely with its shape. This alignment ensures that when the stopper 303 covers an inlet hole (305a, 305b, 305c), it effectively seals it, preventing the ingress of fuel vapor through that specific inlet hole (305a, 305b, 305c).
[00057] In another embodiment, the head portion 102a of the evaporated fuel collecting device 102 responds to shifts in the vehicle's angle, thereby performing the function of a conventional roll over valve (ROV).
[00058] As depicted in Figure 5a, when the vehicle maintains an upright position, the head portion 102a of the evaporated fuel collecting device 102 also remains upright, with the stopper 303 positioned in the centre of the middle portion 301a of the primary passage 301, effectively blocking the central inlet hole 305c of the primary passage 301 in the head portion 102a. However, while the central inlet hole 305c is blocked, the side inlet holes (305a, 305b) remain open, allowing fuel vapor to ingress through these holes/apertures. This selective blocking of one inlet hole (305a, 305b, 305c) while permitting fuel vapor entry through the others ensures that only the necessary amount of fuel vapor, suitable for subsequent processing by the fuel vapor retaining device 202, is collected. By limiting the collection to the required amount, this mechanism optimizes fuel vapor capture efficiency and minimizes wastage, a particularly advantageous feature when the vehicle is in an upright position without any lean angle. Furthermore, this design permits the fuel tank 40 to breathe and vent properly, preventing excessive pressure buildup within the fuel system.
[00059] However, as depicted in Figure 5b and Figure 5c if vehicle 10 experiences tilting, such as during a rollover or extreme maneuvering, the stopper 303 responds to the change in the vehicle's angle. As the vehicle 10 tilts beyond a certain threshold, i.e. a predetermined angle, for example, around 45 degrees, both the head portion 102a and stem portion 102b of the evaporated fuel collecting device 102 tilt accordingly. This adjustment positions at least one inlet hole (305a, 305b) of the head portion 102a near the fuel level of the fuel tank 40. The movable nature of the stopper 303 allows it to respond to the tilting by shifting towards the inlet hole (305a, 305b) near the fuel level, effectively blocking it. This action prevents excessive fuel from escaping the fuel tank 40 into the head portion 102a during vehicle tilting, ensuring that no excessive fuel vapor or liquid enters the fuel vapor retaining device 202 through the head portion 102a. By preventing such potential leakage, this mechanism enhances safety and prevents fuel loss or vapor release during vehicle tilting events. The system's responsiveness to changes in vehicle orientation, such as tilting or rollover, demonstrates its adaptability to various driving conditions, ensuring consistent functionality and safety across different scenarios.
[00060] Further, as per an embodiment, the spring mechanism (304a, 304b), owing to its elastic nature, plays a crucial role in repositioning the stopper 303 once the head portion 102a returns from its tilted position to the upright position. When the vehicle transitions back from a tilted position to an upright position, the elastic properties of the spring mechanism (304a, 304b) facilitate the automatic restoration of the stopper 303 to its original position. This ensures seamless operation and functionality of the fuel vapor collecting device 102, without requiring manual intervention or adjustment. Thus, the spring mechanism contributes to the overall efficiency and reliability of the system, ensuring consistent performance during dynamic vehicle movements.
[00061] In the present invention, the roll-over valve is itself omitted without compromising with the functions performed by the roll-over valve. The evaporated fuel collecting device 102 is adapted not only to collect the fuel vapor from the fuel tank 40 but also to prevent unwanted flooding of the other components of the fuel tank 40 during vehicle roll-overs or extreme tilting. Additionally, the brackets or holder required to mount the roll-over valve are omitted. As a result, the number of components in fuel tank 40 are decreased. Thus, decreasing the cost of the overall fuel system.
[00062] Further, the complexity of the system is considerably reduced thereby reducing the time and cost pertaining to the assembly, inspection, cleaning, servicing, maintenance or replacement of the components of the fuel tank 40. Due to the reduction in the number of components in the fuel tank 40 the available space in the the fuel tank 40 can be effectively utilized. The connecting duct 201 is made of a plurality of pre-formed layers thereby making the connecting duct 201 resistant to damages from vibration. Furthermore, the connecting duct 201 directly connects the evaporated fuel collecting device 102 to the evaporated fuel retaining device 202. Therefore, the length of the connecting duct 201 required for routing is considerably reduced.
[00063] The present disclosed invention relates to an evaporated fuel collecting device 102, an evaporative emission control system and a fuel tank 40. Embodiments illustrated in the present invention relates to a two-wheeled vehicle. However, the present invention can also be worked with the four-wheeled vehicles, all-terrain vehicles (ATVs), off-road vehicles, and even some boats which involve tilting motion of the vehicle in question. Further, the disclosed invention is not limited to the aforementioned embodiments. For example, as used in this specification and the appended claims, the singular forms “a,” “an” and “they” can include plural referents unless the content clearly indicates otherwise. Further, when introducing elements/components/etc. of the assembly/system described and/or illustrated herein, the articles “a”, “an”, “the”, and “said” are intended to mean that there is one or more of the element(s)/component(s)/etc. The terms “comprising”, “including”, and “having” are intended to be inclusive and mean that there may be additional element(s)/component(s)/etc. other than the listed element(s)/component(s)/etc.
[00064] This written description uses examples to provide details on the disclosure, including the best mode, and also to enable any person skilled in the art to practice the disclosure, including making and using any devices or systems. The scope of the disclosure is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal language of the claims.
[00065] It is to be understood that the aspects of the embodiments are not necessarily limited to the features described herein. Many modifications and variations of the present subject matter are possible in the light of the above disclosure.

LIST OF REFERENCE NUMERALS

10: Vehicle
12: Internal combustion engine
14: Front wheel
16: Rear wheel
18: Seat assembly
20: Frame assembly
22: Head pipe
24: Main frame
24A, 24B: Left and right seat rail
25: Down tube
26: Front fork
28: Front fender
32: Head light
36: Muffler
37: Rear light
38: Rear fender
40: Fuel tank
40a: Fuel tank outer
40b: Fuel tank inner
50: Handle bar
102: Evaporated fuel collecting device
102a: Head portion
102b: Stem portion
201: Connecting tube
202: Evaporated fuel retaining device
301: Primary passage
301a: Middle portion
301b, c: Side portions
302: Body
303: Stopper
304a, 304b: spring mechanism
305a, 305b, 305c: Inlet hole

,CLAIMS:CLAIMS
We Claim:
1. A fuel vapor collecting device (102) for a vehicle (10), comprising:
a head portion (102a) positioned near the top portion of a fuel tank (40) of said vehicle (10);
a stem portion (102b) configured to align said head portion (102a) in an upright orientation;
wherein at least one inlet hole (305a, 305b, 305c) being configured in said head portion (102a) for ingress of fuel vapor; and
a primary passage (301) being provided within said head portion (102a), comprising a middle portion (301a) and at least one side portion (301b, 301c);
wherein a movable stopper (303) within said primary passage (301) being configured to seal said at least one inlet hole (305a, 305b, 305c), and
wherein said stopper (303) moves within said primary path corresponding to changes in said vehicle's angle, wherein said stopper (303) being configured to block excessive fuel ingress during tilting of said vehicle (10) beyond a predetermined angle of tilt.
2. The fuel vapor collecting device (102) as claimed in claim 1, wherein said primary passage (301) includes three inlet holes (305a, 305b, 305c), wherein one of said three inlet holes (305a, 305b, 305c) being positioned centrally and the other two of said three inlet holes (305a, 305b, 305c) being positioned on the sides, aligned with the shape of said stopper (303) to ensure effective sealing.
3. A method for controlling fuel vapor ingress in a vehicle (10), comprising:
utilizing a fuel vapor collecting device (102) with a movable stopper (303) to selectively block at least one inlet hole (305a, 305b, 305c) to block excessive fuel ingress during tilting of said vehicle (10) beyond a predetermined angle of tilt ,
positioning said stopper (303) centrally to seal a central inlet hole (305c) when said vehicle being in an upright orientation, while allowing fuel vapor ingress through at least one side inlet hole (305a, 305b),
responding to vehicle tilting events by shifting said stopper (303) for blocking excessive fuel ingress during tilting of said vehicle (10) beyond a predetermined angle of tilt, thereby preventing fuel loss or vapor release.
4. The fuel vapor collecting device (102) as claimed in claim 1 or 2, wherein said stem portion (102b) being configured to allow the passage of the fuel vapor from said head portion (102a) to a connecting duct (201), facilitating efficient transfer of collected fuel vapor.
5. The fuel vapor collecting device (102) as claimed in claim 1 or 2, wherein said stopper (303) being configured to move freely within said primary passage (301), ensuring smooth operation and responsiveness to changes in vehicle orientation.
6. The fuel vapor collecting device (102) as claimed in claim 1, wherein said head portion (102a) includes a fuel vapor retaining device (202) for processing collected fuel vapor, thereby enhancing overall fuel system efficiency.
7. The method as claimed in claim 3, wherein monitoring vehicle tilt angles and adjusting the position of said stopper (303) accordingly for maintaining optimal fuel vapor control during varying driving conditions.
8. The method as claimed in claim 3, wherein said fuel vapor collecting device (102) includes sensors for detecting said vehicle (10) tilt angles and being configured for transmitting signals to control mechanisms for automatic adjustment of said stopper (303).
9. The fuel vapor collecting device (102) as claimed in claim 1, wherein said fuel vapor collecting device (102) being configured to replace a conventional roll-over valve (ROV) system, reducing system complexity and improving reliability.
10. The fuel vapor collecting device (102) as claimed in claim 1, wherein said primary passage (301) includes resilient elements (304a, 304b) within said side portions (301b, 301c), facilitating the movement of said stopper (303) and thereby enhancing sealing efficiency.
11. The fuel vapor collecting device (102) as claimed in claim 1, wherein said stopper (303) being configured to return to its original position once said vehicle (10) returns to an upright position, ensuring continuous and reliable fuel vapor control.
12. The fuel vapor collecting device (102) as claimed in claim 1, wherein said predetermined angle of tilt being more than 45 degrees.
13. The method for controlling fuel vapor ingress in a vehicle (10) as claimed in claim 3, wherein said predetermined angle of tilt being more than 45 degrees.